JP4402761B2 - Printing device - Google Patents

Description

【００８８】
表１において、用紙巻き上がりの発生しやすい印刷条件の下では、版胴１の端面側から見た状態の正面図で示されている図３（ｂ）において、印刷用紙Ｐの先端部が版胴１と圧胴２０とのニップ部Ｎで押圧された後、圧胴２０の用紙クランパ２１から離された印刷用紙Ｐの先端部は、版胴１の外周面に密着していて剥がれにくい状態にあるので、印刷用紙ＰがニップＮ部近傍における版胴１の外周面から剥がれる位置より用紙搬送方向Ｘの下流側に寄った印刷用紙Ｐの先端部に、換言すれば用紙クランパ２１から離された印刷用紙Ｐの先端部目掛けて送風口１３１ａから吐出される送風Ａが当たるように、図３（ｂ）において可動ダクト１３１の送風口１３１ａを下方向に揺動変位させる。
上記したときと反対に、用紙巻き上がりの発生しにくい印刷条件の下では、版胴１の端面側から見た状態の正面図で示されている図３（ａ）において、印刷用紙Ｐの先端部が版胴１と圧胴２０とのニップ部Ｎで押圧された後、圧胴２０の用紙クランパ２１から離された印刷用紙Ｐ（但し、厚紙や封筒のように腰の強い印刷用紙Ｐは用紙クランパ２１によるクランプを行わない特有の用紙搬送動作を行う）の先端部が版胴１の外周面から剥がれやすい状態にあるので、印刷用紙ＰがニップＮ部近傍における版胴１の外周面から剥がれる位置である用紙搬送方向Ｘの上流側寄りの位置に、送風口１３１ａから吐出される送風Ａが当たるように調整することで、図３（ａ）において可動ダクト１３１の送風口１３１ａを上方向に揺動変位させる。
【００８９】
ここで、図３（ａ），（ｂ）において、例えば印刷用紙Ｐの厚さの違いを例にとって、これ以外の他の印刷条件を全て同じ条件に固定した印刷条件の下で、版胴１の外周面からの印刷用紙Ｐの剥がれ方を比較検討してみる。
例えば印刷用紙Ｐのうちで印刷用紙Ｐの厚さが相対的に厚いハガキや画用紙等の厚紙では、腰が強く一般的にインキがその繊維の中に浸透しにくい特性を有することから、用紙巻き上がりは発生しにくい。このような厚紙では、ニップＮ部で印刷された印刷用紙Ｐの先端部は版胴１の回転による慣性によって、あたかも図３（ａ）に示されている剥離ファン６８の送風口１３１ａ目掛けて上方向に飛ぶように自身の腰の強さによって剥離しながら搬送されることから、ニップＮ部近傍を過ぎて版胴１の外周面から剥がれる位置にある厚紙の先端部と版胴１の外周面との間に送風口１３１ａから吐出される送風Ａを当てることによって、ある程度の送風量を印刷用紙Ｐの剥離に使用されないように逃がすように調整するで、図３（ａ）において可動ダクト１３１の送風口１３１ａを上方向に揺動変位させる。
上記厚紙とは反対に、例えば印刷用紙Ｐのうちで印刷用紙Ｐの厚さが相対的に薄い更紙では、腰が弱く一般的にインキがその繊維の中に浸透しやすい特性を有することから、用紙巻き上がりは発生しやすい。このような更紙では、ニップＮ部で印刷され用紙クランパ２１から離された印刷用紙Ｐの先端部はインキの粘着力によって版胴１上に貼り付いてしまうことから、ニップＮ部近傍を過ぎて用紙クランパ２１から離された印刷用紙Ｐの先端部目掛けて送風口１３１ａから吐出される送風Ａを当てるように、図３（ａ）において可動ダクト１３１の送風口１３１ａを下方向に揺動変位させる。
【００９０】
上述したとおり、制御装置１５０は、用紙サイズ検知センサ群８２を除く特性値検出手段群１００からの各種出力信号に基づいて、送風Ａが用紙搬送方向Ｘにおける印刷用紙Ｐの予め設定された部位に当たるようにダクト駆動モータ１３９を制御する。
【００９１】
上記各印刷条件の組み合わせによる用紙巻き上がりの発生度合いに加えて、本実施形態１では押圧手段として圧胴２０を用いているので、次のようなことも副次的に考慮して可動ダクト１３１の送風口１３１ａの揺動変位位置を最終的に決める。すなわち、圧胴２０の用紙クランパ２１により印刷用紙Ｐの先端部がクランプされるときおよび用紙クランパ２１から印刷用紙Ｐの先端部が離れるとき、印刷用紙Ｐの先端部のあばれを抑えると共に、用紙クランパ２１から開放された印刷用紙Ｐの先端部を安定して搬送できるように可動ダクト１３１の送風口１３１ａの揺動変位位置を設定する。すなわち、制御装置１５０は、圧胴２０の用紙クランパ２１により印刷用紙Ｐの先端部がクランプされるときおよび用紙クランパ２１から印刷用紙Ｐの先端部が離れるとき、送風Ａが用紙搬送方向Ｘにおける印刷用紙Ｐのそれぞれ予め設定された部位に当たるようにダクト駆動モータ１３９を制御する。
（実施例）
各印刷条件の組み合わせにおいて、用紙巻き上がりが最も発生しにくい場合と、用紙巻き上がりが最も発生しやすい場合とについて、可動ダクト１３１の送風口１３１ａの位置を実験等に基づいて予め設定した実施例を表２に示す。
【００９２】
【表２】

【００９３】
表２において、可動ダクト１３１の送風口１３１ａ位置が最上位置にあるとは、その位置を図４（ａ）において破線で示すように、用紙巻き上がりが最も発生しにくい場合に対応して、ホームポジション（図４（ａ），（ｂ）では実線で示す）から最も上方向に揺動変位した位置を示し、この最上位置では可動ダクト１３１の送風口１３１ａから吐出される送風Ａを印刷用紙Ｐの剥離に全て使用しないようにある程度の送風Ａを逃がすことを含んでいる。これと反対に、可動ダクト１３１の送風口１３１ａの位置が最下位置にあるとは、その位置を図４（ｂ）において破線で示すように、用紙巻き上がりが最も発生しやすい場合に対応して、ホームポジションから最も下方向に揺動変位した位置を示し、この最下位置では可動ダクト１３１の送風口１３１ａから吐出される送風Ａを印刷用紙Ｐの剥離のために効率的に使用するように調整する。
【００９４】
表２において、可動ダクト１３１の送風口１３１ａ位置をホームポジションとしたときの各印刷条件は、用紙巻き上がりが中程度に発生する場合の各印刷条件の組み合わせ例であり、印刷用紙Ｐの厚さが上質５５ｋｇ紙（ＰＰＣ用紙）のそれであり、温度が２３℃で湿度が６５％（相対湿度：ＲＨパーセント）の標準状態であり、印刷速度が３速であり、画像量が２０％（文字のみのベタ画像なし）の場合であり、この場合の印刷条件において、図４に示すように可動ダクト１３１の送風口１３１ａ位置をホームポジションとしたときに、用紙巻き上がりを最適に防止できることを表している。
表２において、可動ダクト１３１の送風口１３１ａ位置を最上位置としたときの各印刷条件は、用紙巻き上がりが最も発生しにくい場合の各印刷条件の組み合わせ例であり、印刷用紙Ｐの厚さが画用紙（１８０ｋｇ紙）のそれであり、温度が１０℃、湿度が２０％（相対湿度：ＲＨパーセント）であり、印刷速度が５速であり、画像量が７％（文字のみのベタ画像なし）の場合であり、この場合の印刷条件において、図４に示すように可動ダクト１３１の送風口１３１ａ位置を最上位置としたときに、用紙巻き上がりを最適に防止できることを表している。 表２において、可動ダクト１３１の送風口１３１ａ位置を最下位置としたときの各印刷条件は、用紙巻き上がりが発生しやすい場合の各印刷条件の組み合わせ例であり、印刷用紙Ｐの厚さが更紙であり、温度が３０℃、湿度が９０％（相対湿度：ＲＨパーセント）であり、印刷速度が１速（版付けの印刷速度を除く）であり、画像量が５０％（印刷用紙Ｐの前半部分にベタ画像が有る）の場合であり、この場合の印刷条件において、図４に示すように可動ダクト１３１の送風口１３１ａ位置を最下位置としたときに、用紙巻き上がりを最適に防止できることを表している。
【００９５】
また、表２において、可動ダクト１３１の送風口１３１ａ位置を最下位置としたときのもう一つの各印刷条件は、例えば、用紙巻き上がりが中程度に発生しやすい場合と最も発生しやすい場合の各印刷条件の組み合わせ例であり、印刷用紙Ｐの厚さがＰＰＣ紙のそれであり、温度が２３℃、湿度が６５％（相対湿度：ＲＨパーセント）であり、印刷速度が１速（版付けの印刷速度を除く）であり、画像量が８０％（ポスター等のようにベタ画像のみ）の場合であり、この場合の印刷条件において、図４に示すように可動ダクト１３１の送風口１３１ａ位置を最下位置としたときに、用紙巻き上がりを最適に防止できることを表している。
【００９６】
次いで、圧胴２０がさらに反時計回り方向に回転し、その回転位置で３０７°を占めたとき、遮光板５６が給紙開始センサ５４を通過することにより、そのオン出力信号が上記制御装置に入力され、このオン出力信号入力時から一定の遅れ時間を経過した後、レジストモータ５２と同時に給紙モータ５０が回転駆動される。これにより、レジストローラ３３ｂが反時計回り方向に回転され、圧胴２０の用紙クランパ２１に向けて印刷用紙Ｐの先端の給送を開始し、分離ローラ３２を同時に低速で少しの間回転させることで印刷用紙Ｐのたわみが急激に消滅するときに生じる騒音を低減している。
【００９７】
レジストモータ５２が回転駆動されるのに前後して、可動ダクト１３１の送風口１３１ａの位置が上記したように各風向に対応した位置に保持された状態で、可動ダクト１３１の送風口１３１ａからの送風Ａを開始する（ステップＳ８参照）。
【００９８】
レジストローラ対３３ａ，３３ｂの回転により、印刷用紙Ｐの先端がレジストローラ対３３ａ，３３ｂのニップ部に突き当たっている位置から、所定量分だけ用紙搬送方向Ｘの下流側に搬送されると、レジストセンサ７１がオンし、そのオン出力信号が上記制御装置に入力される。この時、レジストローラ対３３ａ，３３ｂのニップにおける印刷用紙Ｐの突き当て位置からレジストセンサ７１取り付け位置までの距離は一定であるため、レジストモータ５２の駆動パルスカウントは一定のはずであるが、特にレジストローラ対３３ａ，３３ｂの回転初期はスリップが発生しやすい。このため、レジストセンサ７１がオンするまでの駆動パルスカウントは、１枚ごとに変わる可能性がある。そこで、上記制御装置は、レジストセンサ７１がオンするまでの駆動パルスカウントから、印刷用紙Ｐの遅れを判断し、その後のレジストモータ５２の回転速度を速めると共にその回転量を増加させてスリップ量補正をする。
【００９９】
上記したスリップ量補正終了後、上記制御装置は、エンコーダセンサ１２１からの出力パルス信号を取り込みつつこれに応じながら、用紙クランパ２１の用紙くわえ位置にタイミングを合わせて印刷用紙Ｐの先端を給送すべくレジストモータ５２を制御する、いわゆるフィードバック制御を行う。上述したように、レジストモータ５２が１パルスで印刷用紙Ｐを送る用紙送り量と、エンコーダ１２０の１パルス幅に対応する圧胴２０の外周移動量とは、同じに設定されている。これにより、例えば、上記制御装置は、圧胴２０に固定されたエンコーダ１２０の１パルス幅に要する時間を上記制御装置内の上記タイマで検出し、圧胴２０側の負荷変動等によりレジストモータ５２の１パルスに要する時間が長くなった場合、レジストモータ５２を減速する。これと反対に、制御装置１５０は、レジストモータ５２の１パルスに要する時間が短くなった場合、レジストモータ５２を増速してやるというフィードバック制御を行い、レジストずれを少なくして印刷レジスト精度の向上を図っている。
【０１００】
なお、圧胴２０は、上記メインモータからの駆動によって、操作パネル等に設けられている印刷速度設定キー（図示せず）により設定された設定印刷速度値に応じた回転速度（周速度）で回転している。印刷用紙Ｐは、圧胴２０の周速度の１．４倍の送り速度で搬送され、圧胴２０の用紙クランパ２１が閉じようとしたとき、用紙クランパ２１に追いつき、圧胴２０の周速度と同じ速度になる。
【０１０１】
圧胴２０の用紙クランパ２１は、に示す所定のタイミング（実施例的には圧胴２０がホームポジションから反時計回り方向に３５０．５°回転した位置を占めたとき）で開く。上記制御装置によるエンコーダ・フィードバック制御下において、レジストローラ３３ｂが反時計回り方向に回転されることにより、上のレジストローラ３３ａが印刷用紙Ｐを介して時計回り方向に従動回転されることによって、印刷用紙Ｐの上記湾曲たわみが消滅する。このとき、各ワンウェイクラッチの作用により、分離ローラ３２と呼出しローラ３０とが印刷用紙Ｐの搬送によって従動回転しながら、印刷用紙Ｐの先端が圧胴２０の用紙クランパ２１に向けて搬送され、用紙クランパ２１に突き当たり衝突する。
この時、可動ダクト１３１の送風口１３１ａから吐出される送風Ａが、版胴１の外周面と圧胴２０の外周面との間のわずかなすき間から少しだけ印刷用紙Ｐの用紙幅方向Ｙの全体に亘って吹き付けられている。この時の送風Ａは、用紙クランパ２１による印刷用紙Ｐの先端部のクランプ動作に支障を来すことなく、印刷用紙Ｐの用紙幅方向Ｙの全体に亘って印刷用紙Ｐの先端部を整えるように吹き付けるものである。
【０１０２】
印刷用紙Ｐの先端が用紙クランパ２１に衝突するタイミングに合わせ、圧胴２０の用紙クランパ２１は、印刷用紙Ｐの先端部をクランプした後、用紙クランパ２１は閉じられ、こうして圧胴２０は、印刷用紙Ｐを圧胴２０の外周面に保持したまま回転し、印刷用紙Ｐの先端部が版胴１の外周面と圧胴２０の外周面との間に搬送される。
版胴１の外周面と圧胴２０の外周面との間に搬送された印刷用紙Ｐに対して、上記接離手段の印圧スプリング２６ａ，２６ｂにより圧胴２０が版胴１の外周面に押圧する上向きに揺動変位されることでニップ部が形成されると共に、圧胴２０の外周面が印刷用紙Ｐを版胴１の外周面に対して押圧する。こうして、圧胴２０の外周面の押圧によって、回転する版胴１の外周面に巻装された製版済みのマスタ２に印刷用紙Ｐが連続的に押圧されることにより、製版済みのマスタ２が版胴１の外周面に密着すると共に、版胴１の開孔部分から製版済みのマスタ２の穿孔部分へとインキが滲み出てきて印刷用紙Ｐの表面に転移され、版付け印刷が行われる。
このとき、インキローラ１３も版胴１の回転方向と同一方向に回転する。インキ溜り１６のインキ１４は、インキローラ１３の回転によりインキローラ１３の表面に付着され、インキローラ１３とドクターローラ１５との間隙を通過する際にその量を規制され、版胴１の内周面に供給される（ステップＳ９参照）。
【０１０３】
この間も、上記制御装置により、上記したパルスエンコーダ・フィードバック制御が行われている。そして、上記制御装置により、上記制御装置のＲＯＭに記憶された分だけレジストモータ５２が回転駆動された（実施例的には圧胴２０がホームポジションから反時計回り方向に７５°（４３５°）回転した位置を占めるまで）と判断されると、レジストモータ５２の回転が停止し、上記制御装置によるフィードバック制御が終了する。
【０１０４】
圧胴２０がさらに回転し、排紙爪４４の手前の用紙排出位置で用紙クランパ２１が開放されると、上記したように各風向が設定された可動ダクト１３１の送風口１３１ａからの送風Ａが、版胴１と印刷用紙Ｐとの間であって、用紙巻き上がりの発生を防止すべく予め設定された用紙搬送方向Ｘにおける印刷用紙Ｐの部位に吹き付けると共に、開放された印刷用紙Ｐの先端部のあばれを抑えながら、かつ、印刷用紙Ｐの先端部を安定して搬送できるように吹き付ける。
これによって、用紙クランパ２１から離された印刷用紙Ｐの先端部が、版胴１上に貼り付くこと無く版胴１から均一に剥離されつつ、排紙爪４４に受け渡される。こうして版胴１から剥離された印刷用紙Ｐは、吸引ファン４９により搬送ベルト４８上に吸着されつつ搬送されて排紙台４５上に排出積載される。こうして、製版済みのマスタ２にインキを充填して製版済みのマスタ２を版胴１の外周面上に密着させる版付けが行われると共に、版胴１が圧胴２０から離間して初期状態に復帰し、印刷待機状態となる（ステップＳ１０参照）。
【０１０５】
版付け印刷終了後、オペレーターは排出された印刷物を目視して、印刷画像品質の確認や印刷画像位置の確認等を行い、これらがオーケーであれば、テンキー９３で印刷枚数を設定し、印刷スタートキー９２を押下することにより、給紙、印刷および排紙の各工程が設定した印刷枚数分繰り返して行われ、この後、剥離ファン６８の駆動を停止することにより送風を終了し、孔版印刷の全工程が終了する（ステップＳ１１〜Ｓ１４参照）。
ここで、版付け印刷終了後の正規の印刷物を得る印刷、排紙時の動作が、版付け印刷動作と相違する点は、以下の印刷速度に関連する点のみである。この時の印刷速度は、印刷速度設定キー９６を押下しなかったので、通常使用される印刷速度に対応した標準印刷速度「設定印刷速度：３速」に自動的に設定される。これにより、版胴１および圧胴２０は、設定印刷速度：３速に対応した印刷速度となるようにメインモータ６０により回転される。印刷用紙Ｐの先端がレジストローラ対３３ａ，３３ｂのニップ部より給送された後の給紙および印刷の各工程は、設定印刷速度：３速に対応した用紙搬送速度および印刷速度で、上述した印刷用紙Ｐの特有の搬送動作および印刷動作が行われる。また、印刷条件としての印刷速度が、版付け印刷速度（１６ｒｐｍ）から設定印刷速度：３速（９０ｒｐｍ）に変更されたので、制御装置１５０は変更された印刷速度に係る出力信号を基づいて、これを加味して、上述したと同様にして可動ダクト１３１の送風口１３１ａからの送風Ａの各風向を設定する。
（実施形態１の変形例１）
図１４および図１５に、実施形態１の変形例１を示す。この変形例１は、図１４および図１５に示すように、図１ないし図１３に示した実施形態１と比較すると、用紙サイズ検知センサ群８２に代えて、用紙サイズを設定するための用紙サイズ設定手段としての用紙サイズ入力キー８４を有すること、および制御装置１５０に代えて制御装置１５０Ａを有することが主に相違する。
【０１０６】
図１５において、符号９０Ａは変形例１の操作パネルを示す。変形例１の操作パネル９０Ａは、実施形態１の操作パネル９０と比較して、上記した用紙サイズ入力キー８４と、用紙サイズ入力キー８４で選択的に設定された用紙サイズを表示するための用紙サイズ表示用のＬＥＤ（発光ダイオード）からなるランプ群８５とを付設したことのみ相違する。
ランプ群８５は、この例では３つの用紙サイズＡ３、Ａ４、Ｂ５のうちの何れか一つの用紙サイズが選択されていることを表示する３つのランプ、すなわち、用紙サイズＡ３の印刷用紙Ｐが選択されていることを表示するランプ８５ａ、用紙サイズＡ４の印刷用紙Ｐが選択されていることを表示するランプ８５ｂ、および用紙サイズＢ４の印刷用紙Ｐが選択されていることを表示するランプ８５ｃからなる。用紙サイズ入力キー８４を１回押すとランプ８５ａが点灯し、同キー８４を２回押すとランプ８５ｂが、同キー８４を３回押すとランプ８５ｃが点灯するというように、用紙サイズ入力キー８４を１回押すごとに順次ランプの点灯が切り替わり、オペレータが設定した用紙サイズが選択されていることを表示するようになっている。
【０１０７】
変形例１の制御装置１５０Ａは、実施形態１の制御装置１５０と比較して、用紙サイズ検知センサ群８２に代えて、用紙サイズ入力キー８４からの出力信号に基づいて、送風Ａが用紙幅方向Ｙにおける印刷用紙Ｐの予め設定された部位に当たるように制風板駆動モータ１２９を制御する制御手段の機能を有することが相違する。以上の構成を具備する変形例１における孔版印刷装置２００の動作は、実施形態１から容易に類推して実施できるので、その説明を省略する。なお、図１４のブロック図では、簡明化を図るため主要な制御対象構成要素および制御構成のみ記載しており、ランプ群８５等の細部の制御対象構成要素の図示を省略している。
（実施形態１の変形例２）
図１６および図１７に、実施形態１の変形例２を示す。この変形例２は、図１６および図１７に示すように、図１ないし図１３に示した実施形態１と比較すると、印刷用紙Ｐの厚さを検出する厚さ検出手段としての用紙厚さ検知センサ１０５に代えて、印刷用紙Ｐの種類を設定するための用紙種類設定手段としての紙種入力キー９４を有すること、および制御装置１５０に代えて制御装置１５０Ｂを有することが主に相違する。
【０１０８】
図１７において、符号９０Ｂは変形例２の操作パネルを示す。変形例２の操作パネル９０Ｂは、実施形態１の操作パネル９０と比較して、上記した紙種入力キー９４と、紙種入力キー９４で選択的に設定された印刷用紙Ｐの種類（以下、「紙種」というときがある）を表示するための紙種表示用のＬＥＤ（発光ダイオード）からなるランプ群９５とを付設したことのみ相違する。
ランプ群９５は、この例では３グループのうちの何れか一つの紙種が選択されていることを表示する３つのランプ、すなわち、標準紙（普通紙）が選択されていることを表示するランプ９５ａ、厚紙が選択されていることを表示するランプ９５ｂ、および薄紙が選択されていることを表示するランプ９５ｃからなる。紙種入力キー９４を１回押すとランプ９５ａが点灯し、同キー９４を２回押すとランプ９５ｂが、同キー９４を３回押すとランプ９５ｃが点灯するというように、紙種入力キー９４を１回押すごとに順次ランプの点灯が切り替わり、オペレータが設定した紙種が選択されていることを表示するようになっている。
【０１０９】
変形例２の制御装置１５０Ｂは、実施形態１の制御装置１５０と比較して、用紙厚さ検知センサ１０５からの出力信号に代えて、紙種入力キー９４からの出力信号に基づいて、送風Ａが用紙幅方向Ｙにおける印刷用紙Ｐの予め設定された部位に当たるように制風板駆動モータ１２９を制御する制御手段の機能を有することが相違する。以上の構成を具備する変形例２における孔版印刷装置２００の動作は、実施形態１から容易に類推して実施できるので、その説明を省略する。
なお、図１６のブロック図では、簡明化を図るため主要な制御対象構成要素および制御構成のみ記載しており、ランプ群９５等の細部の制御対象構成要素の図示を省略している。
（実施形態１の参考例１）
図１８および図１９に、実施形態１の参考例１を示す。参考例１は、実施形態１と比較すると、実施形態１の剥離ファン６８に代えて、剥離ファン１６５を有することが主に相違する。
参考例１の剥離ファン１６５は、図１２に示した実施形態１の剥離ファン６８と同様の位置に配置されている。この剥離ファン１６５は、図１８に模式的に示すファン駆動モータ６９およびファン駆動モータ６９により回転駆動されるファン（図示せず）等を備えた公知のファン部６８ａと、ファン部６８ａに一体的に連結されファン部６８ａで生成した送風を導入し送風する固定ダクト１６７とを有する他、従来の剥離ファンとは異なる構成、すなわち固定ダクト１６７を介してファン部６８ａからの送風Ａの方向を変える風向可変手段を有している。この風向可変手段は、版胴１と印刷用紙Ｐとの間であって版胴１の端面側から見て上下方向Ｚに送風Ａの方向を変える上下風向可変手段１６６からなる。
【０１１０】
上下風向可変手段１６６は、送風Ａを吐出する送風口１６７ａを備え、送風口１６７ａから吐出される送風Ａの方向を上下方向Ｚに変えるべく上下方向Ｚに揺動可能な上下風向可変部材としてのシャッタ１６８と、このシャッタ１６８を版胴１の端面側から見て上下方向Ｚに駆動するための駆動手段としてのシャッタ駆動モータ１６９を備えたシャッタ開閉機構１７４とを具備している。
【０１１１】
固定ダクト１６７の開放端側は、可動ダクト１３１と同様な広口形状に形成されている。固定ダクト１６７の広口形状側の下壁には、固定ダクト１６７へ導入された送風を選択的に逃がすための長方形状のエア抜き孔１７３が開けられている。
シャッタ１６８は、例えば板金や適宜の合成樹脂で板状に形成されていて、平面視で紙面の手前側が長い台形状をなす。シャッタ１６８の自由端部は、固定ダクト１６７の開放端近くまで延び、その基端部は、固定ダクト１６７の広口形状部の止端部近傍の上部において固定ダクト１６７の左右側壁を挿通して回動自在に支持された軸１６８ａに固着されている。シャッタ１６８の自由端側の右側面部には、固定ダクト１６７の右側壁に開けられた開口部１６７ｂから突出する遮光片１７２が一体的に形成されている。シャッタ１６８を軸１６８ａを中心として揺動させることで、送風口１６７ａの面積を可変することができ、これにより送風口１６７ａからの送風Ａの風向を上下方向Ｚに変えることができる。
【０１１２】
シャッタ開閉機構１７４は、上記したシャッタ１６８と、シャッタ軸１６８ａの軸端に固設された従動ギヤ１７１と、従動ギヤ１７１近傍における排紙側板（図１８では図示せず）に取り付け固定されたシャッタ駆動モータ１６９と、シャッタ駆動モータ１６９の出力軸１６９ａに固設され、従動ギヤ１７１と噛み合う駆動ギヤ１７０と、従動ギヤ１７１近傍の上記排紙側板に固設され、シャッタの遮光片１７２と選択的に係合して、シャッタ１６８の上下方向Ｚのホームポジションを検知するシャッタホームポジションセンサ（図示せず）とを具備している。
シャッタ駆動モータ１６９は、ステッピングモータからなる。上記シャッタホームポジションセンサは、発光部および受光部を具備した透過型の光学センサからなる。シャッタ１６８のホームポジションは、シャッタ１６８が固定ダクト１６７の広口形状部の上壁内面と平行状態となる位置に対応して設定されている。ここで、上下風向可変手段１６６の動作を述べておく。シャッタ駆動モータ１６９に所定の駆動パルスが供給されると、シャッタ駆動モータ１６９が図１８において時計回り方向に回転駆動され、その回転駆動力が駆動ギヤ１７０、従動ギヤ１７１、軸１６８ａへと順次伝達されて、シャッタ１６８が図１９に実線で示すホームポジションから時計回り方向へ揺動する。シャッタ１６８の自由端が図１９に仮想線で示すように最下位まで揺動すると、送風口１６７ａが完全に閉じられ、これにより固定ダクト１６７へ導入された送風Ａはシャッタ１６８に当たりその風向を下方向に変えられることにより、エア抜き孔１７３から下方向に逃げる。
したがって、シャッタ駆動モータ１６９に供給される駆動パルス数を可変することにより、シャッタ１６８の揺動角度を段階的に可変することができ、これにより固定ダクト１６７の送風口１６７ａからの送風Ａを所望とする上下方向Ｚに段階的に変えることができる。また同時に、シャッタ１６８が図１９に実線で示すホームポジションから時計回り方向へ揺動するに連れて、エア抜き孔１７３から下方向に逃げる送風Ａの量を可変することができる。例えば、用紙巻き上がりが発生しやすく、固定ダクト１６７の送風口１６７ａからの送風Ａを下方向にしたいときには、シャッタ１６８を図１９に実線で示すホームポジションから時計回り方向へ揺動させることで、図２０（ａ）に示すように、送風口１６７ａからの送風Ａを下方向に変えればよい。これと反対に、用紙巻き上がりが発生しにくく、固定ダクト１６７の送風口１６７ａからの送風Ａが不必要なときには、図２０（ｂ）に示すように、シャッタ１６８の自由端を図１９に仮想線で示すような最下位まで揺動させることにより、シャッタ１６８で送風口１６７ａを閉じ、送風Ａをエア抜き孔１７３から下方向に逃がせばよい。
【０１１３】
参考例１においても、実施形態１、変形例１，２等と同様にして、表２を参照して説明したような動作を容易に実施できることは言うまでもない。なお、剥離ファン１６５は、上記した構造のものに限定されず、例えば固定ダクト１６７に対するシャッタ１６８の基端部位置を図１９において下側に配設し、エア抜き孔１７３を固定ダクト１６７の上壁に形成してもよい。
【０１１４】
実施形態１や変形例１，２、参考例１では、印刷装置が紙くわえ圧胴方式の場合で説明したが、図２１に示すように、押圧手段としてプレスローラ４０を用いた孔版印刷装置２００Ａにも勿論適用できる。
プレスローラ４０は、給紙部２９から給送されてきた印刷用紙Ｐを製版済みのマスタ２を介して版胴１に押し付けて印刷画像を印刷用紙Ｐ上に形成する押圧手段としての機能を有する。プレスローラ４０は、紙面の手前側および奥側に一対配設された各ローラアーム４１の基端部においてアーム軸４２に回転自在に支持されていて、版胴１の外周面に接離自在に設けられている。版胴１に対するプレスローラ４０の印圧は、各ローラアーム４１に張設された引張バネ（図示せず）によって加えられると共に、この引張バネの付勢力によってローラアーム４１は、プレスローラカム（図示せず）の輪郭周面に圧接している。上記プレスローラカムは、版胴１のメインモータ６０駆動部とは独立したプレスローラ駆動モータ（図示せず）によって、レジストローラ対３３ａ，３３ｂからの印刷用紙Ｐの給送タイミングに合せて回転されるようになっている。
孔版印刷装置２００Ａにおける剥離ファン６８または剥離ファン１６５の動作は、実施形態１等から容易に類推して実施できるのでその説明を省略する。
【０１１５】
用紙巻き上がりの要因の特性としては、上記した種々の印刷条件に限らず、例えばインキの種類（硬いインキや柔らかいインキ）等を組み合わせたり、あるいは特開平９−１９３５２６号公報で開示されているような送風量調整手段を本発明の風向可変手段に適宜付設したりして、上述した実施形態１や変形例１，２よりもさらに木目の細かい風向可変制御および送風量調整を行うようにしても勿論構わない。
【０１１６】
実施形態１や変形例１，２では、風向可変手段として、用紙幅風向可変手段１１５と上下風向可変手段１３０とを両方具備していたが、これに限らず、その必要性および用途等に応じて少なくとも用紙幅風向可変手段１１５を具備するものであればよい（請求項１〜９参照）。
【０１１７】
説明が前後するが、孔版印刷装置２００，２００Ａは、従来装置と比較していわゆる上級種であるため、風向可変手段を構成する用紙幅風向可変手段１１５や上下風向可変手段１３０を自動的に各送風の方向を変える構成としたが、これを望まなくてもよいのであれば、用紙幅風向可変手段１１５や上下風向可変手段１３０から各駆動手段等を除去して手動用の機構とすることも勿論可能である（請求項１，２参照）。
【０１１８】
実施形態１の制御装置１５０、変形例１の制御装置１５０Ａや変形例２の制御装置１５０Ｂでは、種々の印刷条件の下において、用紙の巻き上がりを防止すべく、特性値検出手段群１００（画像量検出手段１０１、印刷速度検知センサ６２、温度センサ１０３、湿度センサ１０４、用紙厚さ検知センサ１０５）や紙種入力キー９５からの各種出力信号に基づいて、送風Ａが用紙搬送方向Ｘにおける印刷用紙Ｐの予め設定された部位に当たるようにダクト駆動モータ１３９を制御する機能と、用紙サイズ検知センサ群８２や用紙サイズ入力キー８４からの出力信号に基づいて、送風Ａが用紙幅方向Ｙにおける印刷用紙Ｐの予め設定された部位に当たるように制風板駆動モータ１２９を制御する制御手段の機能と、圧胴２０の用紙クランパ２１により印刷用紙Ｐの先端部がクランプされるときおよび用紙クランパ２１から印刷用紙Ｐの先端部が離れるとき、送風Ａが用紙搬送方向Ｘにおける印刷用紙Ｐのそれぞれ予め設定された部位に当たるようにダクト駆動モータ１３９を制御する制御手段の機能とを併せ有していたが、このように精度が高く木目の細かい印刷用紙Ｐの剥離、排紙動作を望まなくてもよいのであれば、これに限らず、上記した各種センサのうちの一つ、あるいは二つ以上のセンサからの出力信号に基づいて、上記制御機能のうちの一つ、あるいは二つ以上の制御機能を具備するものでもよい（請求項３〜８参照）。
【０１１９】
本発明は、実施形態１や変形例１，２、参考例１のような片面印刷方式に限らず、例えば、特開平９−１９３５２６号公報記載の２胴式の印刷装置に適用できることは勿論、いわゆる両面同時印刷方式にも適用でき、排紙剥離手段として剥離ファンを備えた印刷装置であればどのようなタイプのものであっても適用できる。
【０１２０】
なお、実施形態１や変形例１，２、参考例１における剥離ファン６８や１６５の作動は、上記動作例に限定されず、例えば用紙巻き上がりの発生しにくいものであることが明確になっている場合には、剥離ファン６８や１６５の作動をとめて送風せずオフ状態にしてもよい。そして、これを実施可能とするために、例えば剥離ファン６８や１６５の作動をとめるための送風オフキーのような剥離ファン非作動設定手段を操作パネル等に配設して、製版スタートキーの押下動作に前後してそれを押すことによって剥離ファン６８や１６５を不作動とする。
また、上記送風オフキーを設けず、例えば用紙巻き上がりの発生しにくい印刷条件のような場合、すなわち剥離ファンからの送風が不必要な場合、その印刷条件に基づいて、本発明の制御手段としての制御装置が送風しないように剥離ファン６８や１６５を自動的に不作動とすべく制御するようにしてもよい。
このように剥離ファンからの送風が不必要な場合、剥離ファンからの送風をとめるので、動作音や送風音は発生せず、エネルギーの無駄遣いを無くすことができる。
【０１２１】
以上述べたとおり、本発明を実施例を含む特定の実施形態等について説明したが、本発明の構成は、上述した実施形態や変形例等に限定されるものではなく、これらを適宜組み合わせて構成してもよく、本発明の範囲内において、その必要性および用途等に応じて種々の実施形態や実施例を構成し得ることは当業者ならば明らかである。
【０１２２】
【発明の効果】
以上述べたように、本発明によれば、上述したような従来装置の有する諸問題点を解決して新規な印刷装置を提供することができる。請求項ごとの効果を挙げれば次のとおりである。
請求項１記載の発明によれば、上記構成により、用紙巻き上り等が発生しやすい印刷条件の下では、版胴と印刷用紙との間の最適な位置に送風することで、印刷用紙を版胴から確実に剥離して用紙巻き上り等を防止することができると共に、送風剥離手段（例えば剥離ファン）の動作音や送風音を大きくせずに、省エネルギー化を図ることができ、加えて、印刷用紙のサイズに応じて、版胴と印刷用紙との間の用紙幅方向に均一に送風することが可能となるので、用紙幅方向に亘り印刷用紙を版胴から均一に剥離することができると共に、画像濃度ムラが生じるのを防止することができる。
【０１２３】
請求項２記載の発明によれば、用紙幅風向可変手段を備えた風向可変手段を剥離ファンの送風吐出部に設けたことにより、請求項１記載の発明の効果に加えて、用紙幅風向可変手段を備えた風向可変手段の小型化を図れる。
【０１２８】
請求項３記載の発明によれば、制御手段は、特性値検出手段からの出力信号に基づいて、送風が用紙幅方向における印刷用紙の予め設定された部位に当たるように駆動手段を制御することにより、例えば手動操作によって、用紙幅方向に風向を変えるという煩わしさを伴うこと無く自動的に、請求項１または２記載の発明の効果を奏する。
【０１３０】
請求項４記載の発明によれば、特性値検出手段は、印刷用紙に印刷される画像の画像量を検出する画像量検出手段からなることにより、画像の画像量の多少に応じて、請求項３記載の発明の効果を奏する。
【０１３１】
請求項５記載の発明によれば、特性値検出手段は、版胴の回転速度を検出する回転速度検出手段からなることにより、版胴の回転速度の遅速に応じて、請求項３記載の発明の効果を奏する。
【０１３２】
請求項６記載の発明によれば、特性値検出手段は、印刷装置本体の内部および外部のうちの少なくとも一方の温度を検出する温度検出手段からなることにより、印刷装置本体の内部および外部のうちの少なくとも一方の温度の高低に応じて、請求項３記載の発明の効果を奏する。
【０１３３】
請求項７記載の発明によれば、特性値検出手段は、印刷装置本体の内部および外部の湿度のうちの少なくとも一方の湿度を検出する湿度検出手段からなることにより、印刷装置本体の内部および外部の湿度のうちの少なくとも一方の湿度の高低に応じて、請求項３記載の発明の効果を奏する。
【０１３４】
請求項８記載の発明によれば、特性値検出手段は、印刷用紙の厚さを検出する厚さ検出手段からなることにより、印刷用紙の厚さの厚薄に応じて、請求項３記載の発明の効果を奏する。
【０１３６】
請求項９記載の発明によれば、制御手段は、用紙サイズ検出手段からの出力信号に基づいて、送風が用紙幅方向における印刷用紙の予め設定された部位に当たるように駆動手段を制御することにより、例えば印刷用紙のサイズに応じて、手動操作によって、用紙幅方向に風向を変えるという煩わしさを伴うこと無く自動的に、請求項１または２記載の発明の効果を奏する。
【図面の簡単な説明】
【図１】 本発明の実施形態１を示す孔版印刷装置の剥離ファン、用紙幅風向可変手段および上下風向可変手段周りの斜視図である。
【図２】 実施形態１における剥離ファンの可動ダクトの上下変位動作を示す要部の正面図である。
【図３】 （ａ）は実施形態１における剥離ファンの可動ダクトを上方向へ変位させたときの送風状態を、（ｂ）は可動ダクトを下方向へ変位させたときの送風状態をそれぞれ表す概略的な正面図である。
【図４】 （ａ）は実施形態１における剥離ファンの可動ダクトを最上位置へ変位させたときの送風状態を、（ｂ）は可動ダクトを最下位置へ変位させたときの送風状態をそれぞれ表す概略的な正面図である。
【図５】 実施形態１における用紙幅風向可変手段および開閉機構を示す一部断面平面図である。
【図６】 図５の要部の一部断面正面図である。
【図７】 （ａ）は実施形態１における用紙幅風向可変手段の各制風板が用紙サイズ大に応じて開く方向に移動した動作状態を、（ｂ）は同各制風板が用紙サイズ小に応じて閉じる方向に移動した動作状態をそれぞれ表す概略的な平面図であり、（ｃ）は用紙サイズに応じて制風板が開閉される動作状態を説明する図表である。
【図８】 実施形態１における主要な制御構成を表すブロック図である。
【図９】 実施形態１における操作パネルの要部の平面図である。
【図１０】 実施形態１における用紙サイズ検知センサ群の配設状態を一部を破断して示す斜視図である。
【図１１】 実施形態１における版胴と圧胴の関係および圧胴の用紙クランパの動作を示す概略的な正面図である。
【図１２】 実施形態１における孔版印刷装置の構成を示す概略的な正面図である。
【図１３】 実施形態１における孔版印刷装置の主要な動作順序を示すフローチャートである。
【図１４】 実施形態１の変形例１における主要な制御構成を表すブロック図である。
【図１５】 実施形態１の変形例１における操作パネルの要部の平面図である。
【図１６】 実施形態１の変形例２における主要な制御構成を表すブロック図である。
【図１７】 実施形態１の変形例２における操作パネルの要部の平面図である。
【図１８】 実施形態１の参考例１における剥離ファンおよび上下風向可変手段周りの斜視図である。
【図１９】 実施形態１の参考例１における剥離ファンのシャッタの揺動動作を示す一部断面正面図である。
【図２０】 （ａ）は実施形態１の参考例１における剥離ファンのシャッタの揺動により送風が下方向になったときの動作状態を、（ｂ）は同シャッタを閉じて送風が下方向に逃げている動作状態をそれぞれ表す概略的な正面図である。
【図２１】 プレスローラを用いた実施形態１と別の孔版印刷装置の構成を示す概略的な正面図である。
【符号の説明】
１ 版胴
２ マスタ
２０ 圧胴
２１ 保持手段としての用紙クランパ
６２ 回転速度検出手段としての印刷速度検知センサ
６６ 剥離部材としての剥離爪
６８，１６５ 剥離ファン
８２ 用紙サイズ検出手段としての用紙サイズ検知センサ群
１００ 特性値検出手段群
１０１ 画像量検出手段
１０３ 温度検出手段としての温度センサ
１０４ 湿度検出手段としての湿度センサ
１０５ 厚さ検出手段としての用紙厚さ検知センサ
１１５ 用紙幅風向可変手段
１１６ａ，１１６ｂ 用紙幅風向可変手段を構成する制風板
１２９ 用紙幅風向可変手段の駆動手段としての制風板駆動モータ
１３０ 上下風向可変手段
１３１ 上下風向可変手段を構成する可動ダクト
１３９ 上下風向可変手段の駆動手段としてのダクト駆動モータ
１５０，１５０Ａ，１５０Ｂ 制御手段としての制御装置
２００，２００Ａ 印刷装置の一例としての孔版印刷装置
Ｐ 印刷用紙
Ｘ 用紙搬送方向
Ｙ 用紙幅方向[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printing apparatus including a stencil printing apparatus.
[0002]
[Prior art]
As a simpler printing method than before, a thermal digital plate-making type stencil printing apparatus is known. In this stencil printing apparatus, a thermal stencil master (hereinafter simply referred to as “master”) is brought into contact with the fine heating elements of the thermal head, and the master is conveyed while energizing the heating elements of the thermal head in a pulsed manner. In response to the signal, the master is heated perforated and prepressed, and after the preprinted master is wound around the outer peripheral surface of the porous cylindrical plate cylinder, ink is supplied from the ink supply means inside the plate cylinder, By continuously pressing the printing paper fed from the plate cylinder with a pressing means such as a press roller and an impression cylinder to the plate cylinder and applying a printing pressure, an opening portion of the plate cylinder, and further The ink is oozed out from the perforated portion of the master, and the printed image is formed by transferring the ink to printing paper. Then, the printed printing paper on which the printed image is formed is adhered to the ink using a peeling fan and / or a peeling claw, or an air peeling claw also called an air knife having an air discharge function. The leading edge of the printed printing paper adhering to the master on the plate cylinder is peeled off from the plate cylinder by force, transferred to a paper delivery device equipped with a suction fan, etc. It is supposed to be.
[0003]
In such a stencil printing apparatus, a wide variety of printing papers are used. In general, printing paper is classified into standard paper, thin paper, and thick paper, mainly focusing on its thickness, but more finely, taking into account its surface properties and paper quality, standard paper, renewal paper, thin paper, thick paper Can be classified specially. Specific examples of applications of the sub-classification are as follows. That is, the standard paper includes high quality paper (high quality 55 kg paper, stencil high quality paper, etc.), medium quality paper, recycled paper, and the like. Thin paper includes thin paper and high-quality 45 kg paper, thick paper includes high-quality paper of 135 kg or more, drawing paper, postcards, and the like, and special paper includes envelopes (square and long).
By the way, it is known that the stencil printing apparatus is susceptible to a specific problem called “paper roll-up” in which the printing paper is not peeled off from the printing drum due to the adhesive force of the ink and remains stuck to the printing drum. It has been. With regard to such a paper roll-up phenomenon, for example, in the technology described in Japanese Patent Laid-Open No. 9-193526, a paper roll-up factor system is considered, and the air flow rate blown from the peeling fan is adjusted by the air flow rate adjusting means. By blowing air between the printing paper and the plate cylinder, the leading edge of the printing paper is lifted from the plate cylinder, and the printing paper is peeled off from the plate cylinder by the peeling member, so that paper roll-up is likely to occur. However, by increasing the air flow with the air flow adjustment means, the printing paper is surely peeled from the plate cylinder to prevent paper roll-up, while the printing paper is easily peeled off from the plate cylinder (paper roll-up occurs. Under difficult conditions) By reducing the air flow with the air flow adjustment means, the operating noise and air blowing sound of the peeling fan can be reduced, or between the printing paper and the plate cylinder by the peeling fan. Further, by blowing, density unevenness in the printed image on the printing paper technology capable of preventing from occurring is disclosed by peeling from uniformly plate cylinder of the printing paper.
Most of the above technologies have been considered and disclosed, but the factors of paper roll-up include some of the amount of image printed on the printing paper, slow rotation of the plate cylinder (printing speed), -Various printing conditions such as changes in environmental conditions such as humidity, or differences in the types of printing paper (particularly differences in the thickness of the printing paper) can be mentioned.
Then, the occurrence frequency of paper roll-up for each printing condition is summarized as follows from an experience in general (see Table 1 described later). In other words, as the image amount increases, the amount of ink transferred to the printing paper increases as the image amount increases, so that the paper roll-up easily occurs. The smaller the image amount, the harder the paper roll-up occurs. . In particular, when there is a solid image at the leading edge of the printing paper, the leading edge of the printing paper does not lift from the printing drum and sticks to the printing drum.
As for the printing speed, the slower the printing speed, the longer the time for which the printing paper is pressed against the pre-made master on the plate cylinder, and the greater the amount of ink transferred to the printing paper. On the contrary, the higher the printing speed, the less likely the paper rolls up.
The thinner the printing paper used, the weaker the so-called paper becomes and the more difficult it is to peel off from the cylindrical plate cylinder. Since the paper becomes stiff and easily peeled off from the cylindrical plate cylinder, the paper does not easily roll up. In addition, the higher the temperature and humidity, the more the amount of ink transferred to the printing paper and the lower the stiffness of the paper. The lower the humidity and the lower the humidity, the less likely the paper rolls up.
[0004]
[Problems to be solved by the invention]
In the peeling nail method using the peeling nail alone, when the tip of the peeling nail comes into contact with the image printed on the printing paper, it is a problem disclosed in the technology described in JP-A-9-193526. There is a problem that a so-called “nail mark stain” occurs in which the image on the printing paper is rubbed and soiled by the peeling nail.
[0005]
With the peeling fan method, the printer always rotates at the same rotational speed (number of rotations) during printing and the air flow rate is almost constant, so even under the worst printing conditions where paper roll-up is most likely to occur, In order to lift the tip from the plate cylinder and peel it off, it is set so that the amount of blown air is increased. From another perspective, even under printing conditions where paper roll-up is unlikely to occur, the air is blown to the same part with an air flow more than necessary, and wasteful energy may be used for operation. There is also a problem that the operating cost increases due to an increase in waste of energy.
In the air peeling claw method, the air discharge port is small and the discharge pressure is high, so the air discharge area for the printing paper becomes non-uniform, density unevenness occurs in the image printed on the printing paper, and noise increases. There is. This problem is particularly noticeable when printing paper having a large paper size in the paper width direction is used.
[0006]
Problems that are not mentioned in the technology described in JP-A-9-193526 include the following. For the purpose of improving printing resist accuracy for printing paper, stabilizing image density, and reducing noise during printing, a paper clamper that can be freely opened and closed is provided as a holding means for holding the leading end of the fed printing paper. In the case of the so-called “paper holding impression cylinder method” using an impression cylinder as a pressing means, when the leading edge of the printing paper is clamped, the leading edge of the printing paper is blown away by the air blown from the peeling fan, which is normal. Clamp or paper transport cannot be performed, or when the front end of the print paper is opened, the front end of the print paper released from the paper clamper cannot be stably delivered to the paper discharge claw or paper discharge transport device. There is a problem.
[0007]
Therefore, in order to solve such a problem, the present invention provides various methods in a system using a blower peeling unit including a peeling fan that blows air between the plate cylinder and the printing paper to peel the printing paper from the plate cylinder. A first object is to reliably peel the printing paper from the plate cylinder in accordance with printing conditions to prevent the paper from rolling up. It is a second object of the present invention to save energy without increasing the operating noise and blowing sound of the peeling fan. In addition, the present invention, when adopting the paper holding pressure cylinder method, suppresses the blurring of the leading edge of the printing paper at the time of clamping or opening the leading edge of the printing paper, and the printing paper released from the paper clamper. A third object is to enable the tip portion to be stably conveyed. Furthermore, according to the present invention, in the worst case, when a system using a blower peeling means including a peeling fan and a peeling member including a peeling claw or the like is employed, the occurrence of paper roll-up or jamming is prevented at the worst. The purpose.
[0008]
[Means for Solving the Problems]
  In order to achieve the above-mentioned object, the invention according to claim 1 supplies ink to the master on the plate cylinder from the inside of the plate cylinder on which the master is wound, and presses the printing paper against the master on the plate cylinder. In the printing apparatus that prints on the printing paper and blows air between the plate cylinder and the printing paper by the air peeling means to peel the printing paper from the plate cylinder, the air direction that changes the direction of the air blowing from the air blowing means Has variable meansThe wind direction varying means includes a sheet width wind direction varying means for changing the direction of the air blowing in the sheet width direction.It is characterized by that.
[0009]
  The invention according to claim 2Ink is supplied from the inside of the plate cylinder around which the master is wound to the master on the plate cylinder, the printing paper is pressed against the master on the plate cylinder, and printing is performed on the printing paper. In a printing apparatus that blows air between the printing cylinder and peels the printing paper from the plate cylinder, it has a wind direction varying means that changes the direction of the blowing from the blown peeling means,The blower peeling means comprises a peeling fan, and the air direction varying means is provided in the blower discharge portion of the peeling fan.The air direction changing means includes paper width air direction changing means for changing the direction of the air blowing in the paper width direction.It is characterized by that.
[0010]
  The invention according to claim 3 is the printing apparatus according to claim 1 or 2,The paper width / winding direction varying means includes a driving means for driving the paper width / winding direction, and a characteristic for detecting a characteristic value of a paper roll-up factor that causes the printing paper to remain stuck to the plate cylinder without being peeled from the plate cylinder. And a control means for controlling the driving means so that the air blows against a preset portion of the printing paper in the paper width direction based on an output signal from the characteristic value detection means.It is characterized by that.
[0011]
  The invention according to claim 4 is the claim of claim3In the printing apparatus described,The characteristic of the paper roll-up factor is the image amount of the image printed on the printing paper, and the characteristic value detecting means is an image amount detecting means for detecting the image amount of the image.It is characterized by that.
[0012]
  The invention according to claim 5 is the claim3In the printing apparatus described,The characteristic of the paper roll-up factor is the rotational speed of the plate cylinder, and the characteristic value detecting means comprises rotational speed detecting means for detecting the rotational speed.It is characterized by that.
[0013]
  The invention according to claim 6 is the printing apparatus according to claim 3,The characteristic of the paper roll-up factor is at least one of the internal and external temperatures of the printing apparatus main body, and the characteristic value detection means includes temperature detection means for detecting the at least one temperature.It is characterized by that.
[0014]
  The invention according to claim 7 is the claim3In the printing apparatus described,The characteristic of the paper roll-up factor is the humidity of at least one of the internal and external humidity of the printing apparatus main body, and the characteristic value detection means includes humidity detection means for detecting the at least one humidity.It is characterized by that.
[0015]
  The invention according to claim 8 is the claim3In the printing apparatus described,The characteristic of the paper roll-up factor is the thickness of the printing paper, and the characteristic value detection means comprises a thickness detection means for detecting the thickness.It is characterized by that.
[0016]
  The invention according to claim 9 is the claim1Or2In the printing apparatus described,The paper width / winding direction varying means includes a driving means for driving the paper width and air direction, and the blowing is performed on the paper based on an output signal from the paper size detecting means for detecting the size of the printing paper and the paper size detecting means. Control means for controlling the drive means so as to hit a preset portion of the printing paper in the width direction.It is characterized by that.
[0025]
As described above, the present invention has the same technical problem as the above technique, but a technique that can solve the problem not suggested by the above technique by adopting a configuration different from the above technique. It was made based on thought.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention including examples will be described with reference to the drawings (hereinafter simply referred to as “embodiments”). In the embodiments, members, components, and the like having the same functions and shapes are denoted by the same reference numerals, and description thereof is omitted as much as possible. In the drawing, members and components that are configured as a pair and do not need to be specifically distinguished and described are described by appropriately describing one of them in order to simplify the description. In order to simplify the drawings and the description, even members and components that are to be represented in the drawings may be omitted as appropriate without needing to be specifically described.
(Embodiment 1)
Hereinafter, a first embodiment of the present invention (hereinafter simply referred to as “Embodiment 1”) will be described.
First, an outline of a printing apparatus to which the present invention is applied will be described with reference to FIGS. 11 and 12. In FIG. 12, reference numeral 200 denotes a stencil printing apparatus as an example of a printing apparatus, and reference numeral 201 denotes a main body frame whose outer shape is substantially a casing. The main body frame 201 is provided with various side plates for supporting and attaching various members and components constituting the stencil printing apparatus 200.
[0027]
As shown in FIG. 12, the stencil printing apparatus 200 is disposed on the left side of the plate cylinder 1 and the cylindrical plate cylinder 1 that winds the master 2 that has been made on the outer peripheral surface, and is already wound around the plate cylinder 1. A plate discharging unit 18 that peels and stores the used master 2 from the outer peripheral surface of the plate cylinder 1, a plate making unit 19 that is disposed on the right side of the plate cylinder 1 and that makes and transports the master 2, and the plate cylinder 1. A document reading unit 58 that is disposed above the plate discharge unit 18 and the plate making unit 19 and reads a document; and an ink supply device 22 that is disposed inside the plate cylinder 1 and supplies ink to the master 2 on the plate cylinder 1; And a paper clamper 21 as a holding means for holding and holding the leading end portion of the printing paper P disposed and fed below the plate cylinder 1, and printing paper on the master 2 on the outer peripheral surface of the plate cylinder 1. An impression cylinder 20 for pressing P, and a front end of the printing paper P disposed on the right side of the impression cylinder 20 A paper feeding unit 29 for feeding toward the paper clamper 21, and a paper discharge unit 43 disposed on the left side of the impression cylinder 20.
[0028]
The plate cylinder 1 includes a support cylindrical body having a porous structure and a plurality of mesh screens (not shown) wound around the outer peripheral surface thereof, and is supported rotatably around the shaft pipe 11. The plate cylinder 1 is rotated via a drive system including a main motor 60 so that the rotation speed can be changed corresponding to a plurality of printing speeds. The main motor 60 is composed of, for example, a DC motor, and is fixed to the side plate side of the main body frame 201 so as not to transmit a driving force to the paper feed driving system as will be described later. It is smaller than that.
In FIG. 12, an encoder 61 is attached to the output shaft 60 a of the main motor 60. The encoder 61 is an incremental type photo rotary encoder. On the side plate side in the vicinity of the encoder 61, there is disposed a printing speed detection sensor 62 composed of a transmission type optical sensor having a light emitting portion and a light receiving portion that hold the encoder 61 at a predetermined interval. The rotation speed of the plate cylinder 1 is detected by detecting a predetermined pulse generated in cooperation with the rotation operation of the encoder 61 and the printing speed detection sensor 62 by the rotation drive of the main motor 60 by the printing speed detection sensor 62. It has become so. The printing speed detection sensor 62 has a function of rotation speed detecting means for detecting the rotation speed of the plate cylinder 1, and based on an output signal or the like from the printing speed detection sensor 62, the printing speed detection sensor 62 passes through the main motor 60. The rotation speed is controlled.
[0029]
The master clamper 12 is opposed to a stage (not shown) made of a ferromagnetic material provided along a generatrix on the outer peripheral surface of the cylindrical body, and is rotatably supported via a master clamper shaft 12a. A magnet is attached to the surface facing the stage. When the plate cylinder 1 occupies a predetermined rotational position, the master clamper 12 is opened and closed by a driving force transmitted by an opening / closing device (not shown).
The plate making unit 19 is configured to support a master shaft 10b that can be fed out from a master roll 10 that is wound around a core tube 10a, a platen roller 9 that conveys the master 2, and a platen roller 9. And a pair of upper and lower cutter members 4 provided on the downstream side of the platen roller 9 for cutting and coming apart from the platen roller 9, and a plate feed that feeds the tip of the master 2 toward the master clamper 12. The roller pair 5a, 5b is provided.
[0030]
The platen roller 9 is rotatably supported on its axis, is driven to rotate at a predetermined peripheral speed by the pulse motor 6, and conveys the master 2 while pressing it against the thermal head 17.
The thermal head 17 has a plurality of heating elements arranged in a line in the width direction of the master 2 and is provided so as to be able to contact and separate from the platen roller 9 by a known contact and separation mechanism (not shown). The thermal head 17 selectively heats and punches the master 2 based on the digital image signal processed and sent out by the A / D conversion unit and the thermal head drive control unit of the document reading unit 58 to form a punched image. It has the function to do.
The upper cutter member 4 is moved up and down by an eccentric cam 8 rotated by a cutter drive motor 7 to cut the master 2.
[0031]
The ink supply device 22 rotates in synchronization with the plate cylinder 1 in the same direction, and is arranged in parallel with an ink roller 13 for supplying the ink 14 to the inner peripheral surface of the plate cylinder 1 and a slight gap with the ink roller 13. A doctor roller 15 that forms an ink reservoir 16 between the ink roller 13 and a shaft pipe 11 that supplies ink 14 to the ink reservoir 16 is provided. The ink roller 13 and the doctor roller 15 are rotatably supported by side plates fixed to the shaft pipe 11. The ink 14 supplied from the ink reservoir 16 to the outer peripheral surface of the ink roller 13 is supplied to the inner peripheral surface of the plate cylinder 1 because a slight gap is provided between the plate cylinder 1 and the outer peripheral surface of the ink roller 13. The The ink 14 is pumped by an ink pump from an ink pack arranged at an appropriate position, and is supplied to the ink reservoir 16 from the supply hole of the shaft pipe 11.
[0032]
In this stencil printing apparatus 200, an impression cylinder 20 provided with a paper clamper 21 is used as a pressing means for the purpose of improving printing resist accuracy with respect to the printing paper P, stabilizing image density, and reducing noise during printing. As shown in FIG. 11, the impression cylinder 20 is formed so that its outer diameter D (diameter) is equal to the outer diameter D (diameter) of the plate cylinder 1, and when the plate cylinder 1 rotates once, the impression cylinder 20 also makes one revolution. For this reason, as shown in FIG. 11, a paper clamper 21 that holds the leading edge of the fed printing paper P can be provided on the impression cylinder 20, and the leading edge of the printing paper P hits the paper clamper 21. By feeding paper while applying, the printing resist accuracy for the printing paper P can be improved.
Further, after the leading end of the printing paper P is abutted against the paper clamper 21 at the rotational position of the paper clamper 21 in the impression cylinder 20 indicated by (1) in FIG. 11 (hereinafter sometimes referred to as “paper holding position”), When the paper clamper 21 is closed, the leading end of the printing paper P is held by the paper clamper 21. Next, the rotational position of the paper clamper 21 in the impression cylinder 20 sequentially changes from (1) → (2) → (3), so that the rotational position of (3) (hereinafter referred to as “paper discharge position”). The paper clamper 21 is opened, and the leading edge of the printing paper P is opened and ejected at a position that is too far from the rotational position (2) where the ink is transferred to the printing paper P. There is also an advantage that it is difficult to wind the plate cylinder 1 by force.
[0033]
End plates 20 b at both ends of the impression cylinder 20 are fixedly supported by the impression cylinder shaft 23. A pair of arms 25a and 25b each having a bearing support portion and a cam follower (both not shown) including a bearing are disposed outside the both end plates 20b of the impression cylinder 20. The pressure drum shaft 23 is rotatably supported by these arm pairs 25a and 25b via bearings (not shown) attached to both ends of the pressure drum shaft 23, respectively. Thereby, the impression cylinder 20 is rotatable because both ends of the impression cylinder shaft 23 are rotatably supported by the bearing support portions via the respective bearings. One end of one arm 25a of the arm pair 25a, 25b is connected to a fulcrum shaft 24a fixed to a pair of side plates (not shown) disposed on the main body frame 201 side via a bearing (not shown). One end of the other arm 25b is supported by a fulcrum shaft 24b rotatably supported by the other side plate via a bearing (not shown). Both fulcrum shafts 24a and 24b are arranged coaxially with respect to the arm pair 25a and 25b.
[0034]
A drive gear (not shown) for transmitting rotation to the impression cylinder 20 is fixed to the inner end portion side of the fulcrum shaft 24b rotatably supported by the other arm 25b, and the impression cylinder axis 23 on the arm 25b side is fixed. An impression cylinder gear (not shown) that meshes with the drive gear is fixed to the motor. A toothed impression cylinder pulley (not shown) that transmits the rotational force of the plate cylinder 1 is fixed to the outer end portion side of the fulcrum shaft 24b. A toothed belt (not shown) is wound around a toothed plate cylinder side pulley attached to the end plate 1a. On the other hand, another pulley is coaxially attached to the end plate 1a on the back side of the plate cylinder 1 coaxially with the above-described plate cylinder side pulley. As a result, the rotational force of the main motor is transmitted to the other pulley via the toothed belt, and sequentially, the plate cylinder side pulley, the toothed belt, the impression cylinder side pulley, the drive gear, and the pressure gear. By being transmitted to the cylinder gear, the impression cylinder 20 is rotated counterclockwise at the same peripheral speed as that of the plate cylinder 1 so that the pressing position with the plate cylinder 1 is the same.
[0035]
A cylindrical portion that is in contact with the outer peripheral surface of the plate cylinder 1 and a concave portion 20 a that is recessed in a D shape to avoid a collision with the master clamper 12 in the plate cylinder 1 are formed on the outer peripheral portion of the impression cylinder 20. . In terms of the embodiment, the impression cylinder 20 is made of synthetic resin in the main body portion to reduce the weight, and nitrile rubber is wound around the outer periphery of the cylindrical portion. Rotation unevenness is reduced.
In the recess 20a of the impression cylinder 20, a paper clamper 21 that clamps the leading end of the printing paper P is provided. The paper clamper 21 employs a clamping method using a magnet, and the paper clamper 21 has a base end fixed to a paper clamper shaft disposed in the recess 20a and is always closed by a spring (not shown). Is being energized. The paper clamper 21 is opened on a predetermined timing by a cam (not shown) provided on the main body frame 501 side, and the print paper P is printed on the outer peripheral surface of the impression cylinder 20 by closing the front end portion of the print paper P and closing it. The paper P is held. When the printing paper P is a standard paper (plain paper) or thin paper, the paper clamper 21 holds the leading edge of the paper 2 from the leading edge of the printing paper P to about 2 mm, so that the printing paper P is compressed. It is held on the outer peripheral surface of the trunk 20. On the other hand, when the printing paper P is a thick paper or the like, the paper clamper 21 is not completely closed by the clamping reaction force due to the stiffness of the printing paper P at the time of clamping. The printing paper P is controlled to rotate and transport without clamping the leading edge of the printing paper P in order to prevent the ink from splashing when the part hits the master 2 on the outer peripheral surface of the plate cylinder 1 or the mesh screen. The
[0036]
The impression cylinder 20 is configured to be able to contact with and separate from the outer peripheral surface of the plate cylinder 1 by means of contact and separation described below. The contact / separation means includes a pair of cam followers (see FIG. 5) including arm pairs 25a and 25b that swing the impression cylinder 20 around fulcrum shafts 24a and 24b, and bearings that are rotatably supported on the other ends of the arm pairs 25a and 25b. A pair of printing springs 26a and 26b that urge the arm pairs 25a and 25b toward the plate cylinder 1, and a pair of cams (not shown) that selectively contact the pair of cam followers, respectively. Consists mainly of.
[0037]
The pair of cams are connected to the plate cylinder 1 and the main motor 60 by a toothed belt (not shown), and are rotated in synchronization with the rotation of the plate cylinder 1. The pair of cams have contoured peripheral surfaces such that the outer peripheral portion excluding the concave portion 20a in the impression cylinder 20 presses against a predetermined printing hole area excluding the portion where the master clamper 12 is disposed in the plate cylinder 1. The cam follower is slidably contacted.
When the printing paper P is transported in error or at the time of making a plate, the above-mentioned pair of pressures is released by the operation of a printing pressure releasing mechanism including a pressure releasing solenoid (not shown) disposed on the main body frame 201 side on the impression cylinder 20 side. By releasing the printing pressure so that the cam and the pair of cam followers are not in sliding contact with each other, the plate cylinder 1 and the pressure drum 20 are not pressed and the pressure drum 20 is separated from the plate cylinder 1. When there is no conveyance mistake or the like, the impression cylinder 20 holding the printing paper P is pressed against the outer peripheral surface of the plate cylinder 1 by a pair of printing springs 26a and 26b. As described above, the impression cylinder 20 is separated from the plate cylinder 1 from the position pressed against the plate cylinder 1 around the fulcrum shafts 24a and 24b by the operation of the printing pressure release mechanism and the rotation operation of the pair of cams. Close to and away from the position.
[0038]
The printing springs 26 a and 26 b generate printing pressure that presses the impression cylinder 20 against the plate cylinder 1. In order to apply the pressing force of the impression cylinder 20 to the plate cylinder 1 uniformly, printing springs 26a and 26b are attached to the arm pairs 25a and 25b at both ends of the impression cylinder 20, respectively.
The detailed configuration of the drive system including the main motor and the contacting / separating means is the same as that shown in FIGS. 1 to 5 of Japanese Patent Laid-Open No. 9-216448, for example. .
[0039]
A paper feed unit 29 is disposed on the right side of the impression cylinder 20. The paper feeding unit 29 forms a deflection at the leading end of the printing paper P, and then moves up and down as registration means that feeds the leading edge of the printing paper P between the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the impression cylinder 20. A pair of registration rollers 33a and 33b, a paper feeding base 31 on which the printing paper P is stacked and can be moved up and down horizontally, and the printing paper P on the paper feeding base 31 are separated one by one to form a pair of registration rollers 33a and 33b. Paper feeding means having a calling roller 30, a separation roller 32, and a separation pad 34 that feed the leading edge of the printing paper P toward the paper feeding, and a paper feeding that abuts and aligns the leading edge of the printing paper P loaded on the paper feed tray 31. A front plate 35, a pair of registration rollers 33a and 33b, a pair of guide plates 38 and 38 for guiding the leading edge of the printing paper P to the paper clamper 21 of the impression cylinder 20, and a paper feeding motor 50 for rotating the paper feeding means , Registration roller pair 33 , 33b, a registration motor 52, a paper leading edge sensor 70 that is disposed in the paper conveyance path R between the paper feed roller 32 and the registration roller pair 33a, 33b, detects the leading edge of the printing paper P, and an impression cylinder. 20 and a registration sensor 71 as a paper leading edge detection unit that is disposed in a paper conveyance path R between the pair of registration rollers 33a and 33b and detects the leading edge of the printing paper P.
The separation roller 32 and the calling roller 30 are connected by a toothed endless belt 37 that is stretched between a separation roller pulley provided on the shaft of the separation roller 32 and a calling roller pulley provided on the shaft of the calling roller 30. And is in a driving force transmission relationship.
[0040]
The paper feed motor 50 is composed of a stepping motor fixed on the main body frame 201 side, and is provided independently of the rotational driving force of the main motor 60, and feeds paper that rotates the separation roller 32 and the calling roller 30. It has a function as a driving means. The paper feed motor 50 is connected to a drive pulley provided on the output shaft of the paper feed motor 50 and a paper feed pulley provided on the shaft of the separation roller 32 via a toothed endless belt 51. It is connected to the separation roller 32. Accordingly, the separation roller 32 is rotated in the clockwise direction by the rotation driving of the paper feed motor 50. A one-way clutch (not shown) is incorporated in each of the shafts of the separation roller 32 and the calling roller 30, and the separation roller 32 and the calling roller 30 rotate only in the clockwise direction.
The registration motor 52 is composed of a stepping motor, and a toothed endless belt 53 is provided between a driving pulley provided on the output shaft of the registration motor 52 and a registration pulley provided on the shaft of the registration roller 33b. And connected to the registration roller 33b.
[0041]
The sheet leading edge sensor 70 and the registration sensor 71 are respectively attached to the upper guide plate 38 sandwiching the registration roller pair 33a and 33b. These sensors 70 and 71 are formed of reflective optical sensors. The paper leading edge sensor 70 has a jam detecting function for detecting a jam of the printing paper P generated on the upstream side in the paper transport direction X including the paper feeding means by detecting the leading edge of the printing paper P, It also has a partial function of adjusting the amount of deflection when a curved deflection is formed by abutting the tip of the printing paper P against the nip portion of the roller pair 33a, 33b. The registration sensor 71 has a jam detection function of detecting a jam of the printing paper P that occurs on the upstream side in the paper conveyance direction X including the registration roller pairs 33a and 33b by detecting the leading edge of the printing paper P.
[0042]
The paper feed table 31 is provided so that the print paper P can be stacked and moved up and down. As shown in FIG. 10, a pair of left and right side fences 76 a and 76 b are disposed on the upper surface of the paper feed table 31 so as to be movable in the paper width direction Y orthogonal to the paper transport direction X. The pair of side fences 76a and 76b have a left-right interlocking structure, and are used by an operator to position the printing paper P in accordance with the both end surfaces of the printing paper P according to the size of the printing paper P.
As shown in FIG. 10, a paper size detection mechanism including a paper size detection unit that detects the size of the printing paper P is disposed at the bottom of the paper feed tray 31. This paper size detection mechanism detects and determines the size of the print paper P in conjunction with the movement of the side fence pairs 76a and 76b in the paper width direction Y. The side fence pairs 76a and 76b and the paper feed table 31 are detected. A pinion 79 rotatably attached to and supported by an immovable member disposed in the lower part of the rack, a rack part 78 formed on the lower edge of the side fence 76a on the left front side in FIG. 10 and meshing with the pinion 79, 10, a rack portion 77 that is formed at the lower edge of the right-side side fence 76 b and engages with the pinion 79 so as to face the rack portion 78, and protrudes downward at the lower edge of the rack portion 77 to have an appropriate interval. A shielding portion 77a having a plurality of cutouts that are cut by holding, and the shielding portion 77a fixed to the stationary member of the paper feed base 31 at an appropriate interval. Two paper size detection sensors 80a and 80b that are selectively engaged, and a paper size detection sensor 81 that is fixedly spaced in the paper transport direction X of the stationary member of the paper feed base 31 are provided. ing.
[0043]
Each of the paper size detection sensors 80a and 80b is a transmissive optical sensor having a light emitting portion and a light receiving portion, and selectively engages with the shielding portion 77a to set the size of the printing paper P in the paper width direction Y. To detect. The paper size detection sensor 81 is a reflective optical sensor having a light emitting unit and a light receiving unit, and detects the size of the printing paper P in the paper transport direction X. Each of the paper size detection sensors 80a and 80b and the paper size detection sensor 81 constitutes a paper size detection sensor group 82 as the paper detection means, and combines the size signal data detected by the paper size detection sensor group 82. The CPU of the control device described later determines and recognizes the paper size of the printing paper P.
[0044]
Note that details of such a paper size detection method include a technique previously proposed by the applicant of the present application and disclosed in, for example, Japanese Patent Application Laid-Open No. 9-30714. Needless to say, the paper size detection method is not limited to the method described above, and other methods may be used. In the above-described paper size detection mechanism, the number of each detection sensor is limited to simplify the description. However, for example, the above-mentioned paper size detection mechanism can automatically detect the size of a postcard, an envelope, or a legal size printing paper P. It is assumed that each detection sensor is increased and attached.
[0045]
In the first embodiment, a paper feed control configuration for reliably feeding the front end of the printing paper P toward the paper clamper 21 of the impression cylinder 20 without misclamping or the like is provided. Briefly described. A light shielding plate 55 and a light shielding plate 56 are respectively fixed to the outer wall of the rear end plate 20 b of the impression cylinder 20 at a predetermined interval in the same circumferential direction of the impression cylinder 20. Each of the light shielding plates 55 and 106 is made of a sheet metal or the like, has an L shape in a front view and a side view, and has a tip projecting from the back side.
On the other hand, a paper feed start sensor 54 is fixed inside the arm 25b so as to face the same circumference of the impression cylinder 20 to which the light shielding plate 55 and the light shielding plate 56 are attached. The paper feed start sensor 54 is a transmissive optical sensor.
The light shielding plate 55 and the paper feed start sensor 54 are attached so as to be selectively engaged and light-shielded only at a predetermined rotational position where the impression cylinder 20 is rotated counterclockwise, and the registration roller pairs 33a and 33b. In contrast, it has a function as a paper feed timing detection means for taking the timing of feeding the leading edge of the print paper P. In other words, the predetermined rotational position of the pressure drum 20 is the mounting position of the light shielding plate 55 on the end plate 20b of the pressure drum 20, and the pressure drum 20 at the position shown in FIG. The sheet feeding start sensor 54 is set to be turned on at a position rotated 194 ° in the rotation direction. The light shielding plate 56 and the paper feed start sensor 54 are attached so as to be selectively engaged and shielded only at a predetermined rotational position where the impression cylinder 20 is rotated counterclockwise. 21 has a function as a timing detection means for taking a timing to start feeding the leading edge of the printing paper P toward the paper 21. In other words, the predetermined rotational position of the impression cylinder 20 is the position where the light shielding plate 56 is attached to the end plate 20b of the impression cylinder 20. In other words, the impression cylinder 20 at the position shown in FIG. The sheet feeding start sensor 54 is set to be turned on at a position rotated by 307 ° in the rotation direction.
[0046]
An encoder 64 is attached to the back end plate 20b of the impression cylinder 20 with screws or the like. The encoder 64 is an incremental type photo encoder. On the other hand, an encoder sensor 65 is attached to the inside of the arm 25b in the vicinity of the encoder 64 with screws or the like so as to sandwich the outer periphery of the encoder 64 with a predetermined interval. These encoder 64 and encoder sensor 65 are pulse encoders that detect fluctuations in the rotational speed of the impression cylinder 20 for controlling the timing of feeding the leading edge of the printing paper P to the paper clamper 21 of the impression cylinder 20. It has a function.
[0047]
In the vicinity of the left side of the impression cylinder 20, a paper discharge unit 43 is disposed. The paper discharge unit 43 is disposed in the vicinity of the outer peripheral surface of the plate cylinder 1 so as to be freely accessible, and is a peeling member that peels off the printed printing paper P (hereinafter sometimes simply referred to as “printing paper P”) from the printing cylinder 1. , A peeling fan 68 as air blowing means for separating the printing paper P from the plate cylinder 1 by blowing air between the master 2 on the plate cylinder 1 and the printing paper P, and discharging the paper When the paper clamper 21 occupying the position is opened, the leading end of the printing paper P is peeled off from the outer peripheral surface of the impression cylinder 20 and is also called a scraper 44 called a scraper. A porous conveyance belt 48 stretched between a conveyance roller front 46 and a conveyance roller rear 47 for conveying the printing paper P; a suction fan 49 for sucking the printing paper P on the conveyance belt 48; A paper discharge tray 45 for stacking the discharged print paper P; It is provided.
[0048]
The peeling claw 66 is on the downstream side in the paper transport direction X in the nip portion formed by contact between the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the impression cylinder 20, and in the vicinity of the outer peripheral surface of the plate cylinder 1. One place is arranged at the center. The leading end of the peeling claw 66 is a peeling position close to the outer peripheral surface of the plate cylinder 1 in order to peel the printing paper P from the plate cylinder 1, and a plate cylinder protrusion such as a master clamp 12 part on the plate cylinder spaced apart from the peeling position. And a non-peeling position that avoids interference with the shaft 67. The peeling claw 66 is driven to be displaced between the peeling position and the non-peeling position by a known cam mechanism (not shown) that rotates in synchronization with the plate cylinder 1.
[0049]
In the first embodiment, the peeling claw 66 is the impression cylinder 20 provided with the paper clamper 21 as the pressing means and the peeling fan 68. Therefore, as compared with the case where the pressing means is a press roller, a thick paper or envelope is used. It is difficult for paper to be rolled up on the plate cylinder 1 except when using a printing paper P having a waist, etc., but even if it is a printing paper P with a waist such as a cardboard or an envelope, it is a paper in the worst state. It is used for the purpose of forcibly peeling the printing paper P from the plate cylinder 1 in order to prevent winding up and jamming associated therewith. Therefore, in this invention, the peeling nail | claw 66 as a peeling member is not an essential structure.
[0050]
The conveyance belt 48 is set to be driven at a conveyance speed faster than the peripheral speed of the plate cylinder 1 by a drive motor or the like (not shown). The transport roller front 46, the transport roller rear 47, the transport belt 48, the suction fan 49, and the drive motor constitute a known paper discharge transport device, which is a paper transport direction X in the paper discharge claw 44. It is arrange | positioned in the downstream.
[0051]
As shown in FIG. 12, the peeling fan 68 is disposed on the downstream side in the paper transport direction X in the printing unit and in the vicinity of the upper portion of the peeling claw 66. The peeling fan 68 includes a fan drive motor 69 and a fan (not shown) that is rotationally driven by the fan drive motor 69 as schematically shown in FIG. In addition to the fan duct 68b that introduces the air generated by the fan portion 68a and is integrally connected, the configuration is different from that of the conventional separation fan, that is, the direction of the air blow A from the fan portion 68a is changed via the fan duct 68b. It has a wind direction variable means. The wind direction varying means includes a vertical wind direction varying means 130 that changes the direction of the air blow A in the vertical direction Z between the plate cylinder 1 and the printing paper P and viewed from the end face side of the plate cylinder 1, the plate cylinder 1 and the printing. A paper width / wind direction varying means 115 that changes the direction of the air blow A in the paper width direction Y with respect to the paper P is provided. The air direction changing means including the up / down air direction changing means 130 and the paper width air direction changing means 115 is provided in a movable duct 131 as a blower discharge portion of the peeling fan 68.
[0052]
The fan drive motor 69 is a DC motor. The peeling fan 68 is disposed between a pair of left and right paper discharge side plates 114a and 114b disposed along the paper transport direction X. The fan portion 68a and the fan duct 68b are connected to the paper discharge side plates 114a and 114b. It is fixedly attached on the side plate connecting portion 114c that connects the two.
[0053]
The up-and-down air direction varying means 130 includes an air outlet 131a that discharges the air A, and a movable duct as an up-and-down air direction variable member that is movable in the up and down direction Z so as to change the direction of the air A discharged from the air outlet 131a to the up and down direction Z. 131 and a vertical displacement mechanism 132 provided with a duct drive motor 139 as drive means for driving the movable duct 131 in the vertical direction Z when viewed from the end face side of the plate cylinder 1.
[0054]
At the upstream end of the movable duct 131 in the sheet conveyance direction X, a blower port 131a having a rectangular shape long in the sheet width direction Y is formed. The movable duct 131 is formed of, for example, a sheet metal or a suitable synthetic resin, and has a substantially trapezoidal shape in plan view that gradually widens from the downstream side in the paper transport direction X toward the upstream side. The movable duct 131 is disposed between the paper discharge side plates 114a and 114b, and the air blowing port 131a side swings a pair of fulcrum pins 142 and 142 installed on the left and right outer walls of the movable duct 131. As shown in FIG. The left and right outer walls at the upstream end in the paper transport direction X of the fan duct 68b extend to the upstream side in the paper transport direction X and form pin connection portions 144 through which the fulcrum pins 142 are inserted. Therefore, the movable duct 131 can be oscillated and displaced in the vertical direction Z with respect to the fan duct 68b by assembling each fulcrum pin 142 through each pin connecting portion 144 in the fan duct 68b. The fan duct 68b and the movable duct 131 are formed of flexible synthetic resin, rubber, or the like so as not to leak the air blow A from the fan duct 68b to the outside and to withstand the swing displacement. The connection members 141 are connected.
[0055]
The vertical displacement mechanism 132 includes a connecting portion structure including the fulcrum pins 142 described above, racks 133a and 133b provided on the paper discharge side plates 114a and 114b, pinions 134a and 134b engaged with the racks 133a and 133b, A shaft 135 that connects the pinion 134a and the pinion 134b, a worm wheel 136 that is fixed to the approximate center of the shaft 135, a worm 140 that meshes with the worm wheel 136, and a shaft that is fixed to the shaft of the worm 140 are schematically shown. A duct drive motor 139 and a first home position sensor 138 that detects the home position in the vertical direction Z of the movable duct 131 are provided.
The duct drive motor 139 is a stepping motor, and is fixed to the bottom wall portion of the movable duct 131 near the air blowing port 131a. A bracket 137 having a hat shape in a side view is fixed to the bottom wall portion of the movable duct 131 at the lower portion of the blower port 131a. Both end portions of the shaft 135 are inserted into the left and right walls of the bracket 137 and are rotatably supported by the left and right walls of the bracket 137.
The first home position sensor 138 includes a transmissive optical sensor having a light emitting unit and a light receiving unit. A light shielding plate 143 that engages with the first home position sensor 138 when the movable duct 131 occupies the home position is fixed to the right outer wall portion of the movable duct 131 near the air blowing port 131a in FIG. The home position of the movable duct 131 is set to a position where the upper wall surface of the movable duct 131 on the air outlet 131a side is flush with the upper wall surface of the fan duct 68b.
[0056]
Here, the operation of the up / down wind direction varying means 130 will be described. For convenience of explanation, it is assumed that the movable duct 131 operates from a home position indicated by a solid line in FIGS. 1 and 2. In accordance with a command from the CPU of the control device 150 shown in FIG. 8 to be described later, a predetermined number of positive numbers for displacing the air duct 131a of the movable duct 131 downward by a predetermined angle (clockwise in FIG. 2). When the rolling drive pulse is given to the duct drive motor 139, the duct drive motor 139 is driven to rotate forward, and the rotational driving force is sequentially transmitted to the worm 140, the worm wheel 136, and the shaft 135, so that each pinion 134a, 134b is transmitted. 1, the air duct 131a side of the movable duct 131 rotates the fulcrum pins 142 on both sides with respect to the fixed racks 133a and 133b meshing with the pinions 134a and 134b by rotating counterclockwise in FIG. As shown in FIG. 2 and FIG. 3B, for example, as shown in FIG. 2 and FIG. Distance displaced.
Contrary to the above, when a predetermined number of reverse drive pulses are applied to the duct drive motor 139 for causing the air duct 131a side of the movable duct 131 to swing upward by a predetermined angle (counterclockwise in FIG. 2). The duct drive motor 139 is driven in reverse, the rotational driving force is transmitted in the same manner as described above, and the pinions 134a and 134b rotate in the clockwise direction in FIG. For example, as shown in FIG. 3A, the fulcrum pins 142 on both sides are displaced by a predetermined distance together with the paper width air direction varying means 115 together with the paper width wind direction varying means 115.
[0057]
As shown in FIGS. 1, 5, and 6, the sheet width air direction varying means 115 is movable in the sheet width direction Y so as to change the air blow A from the fan duct portion 68 b to the sheet width direction Y inside the movable duct 131. A pair of left and right wind control plates 116a and 116b as a sheet width wind direction variable member, and a wind control plate drive motor 129 as a drive unit for driving these wind control plates 116a and 116b in conjunction with the sheet width direction Y are provided. And an opening / closing mechanism 118 provided.
[0058]
Each of the air control plates 116a and 116b is formed of, for example, a sheet metal or an appropriate synthetic resin, and has a rectangular shape that is long in the paper transport direction X when viewed from the front. The free ends of the wind control plates 116a and 116b extend to the vicinity of the air blowing port 131a, and their base end portions are inserted through the upper and lower walls of the movable duct 131 in the vicinity of the wide-mouthed toe end of the movable duct 131. It is fixed to wind-control plate shafts 117a and 117b that are movably supported.
[0059]
The opening / closing mechanism 118 is fixed on the shaft ends of the wind control plate shafts 117a and 117b, the second driven gear 122 fixed on the shaft end of the wind control plate shaft 117a, and the shaft end of the wind control plate shaft 117b. The first driven gear 123, the wind control plate drive motor 129 attached and fixed via a motor bracket 127 fixed to the upper wall surface of the movable duct 131 in the vicinity of the first driven gear 123, and the wind control plate drive motor A drive gear 119 fixed to the output shaft 129a of the 129, and an upper wall surface of the movable duct 131 between the drive gear 119 and the first driven gear 123 are rotatably supported by a shaft 120a. The first intermediate gear 120 meshed with both gears of the first driven gear 123 and the shaft 121a on the upper wall surface of the movable duct 131 between the first intermediate gear 120 and the second driven gear 122 rotate itself. And a second intermediate gear 121 that meshes with both the first intermediate gear 120 and the second driven gear 122, and a bracket (not shown) fixed on the upper wall of the movable duct 131. And a second home position sensor 128 that detects the home position of the wind plates 116a and 116b in the paper width direction Y.
[0060]
The wind control plate drive motor 129 is a stepping motor. The second home position sensor 128 includes a transmissive optical sensor having a light emitting unit and a light receiving unit. A light shielding piece 124 that is engaged with the second home position sensor 128 when the respective wind control plates 116a and 116b occupy the home position is fixedly provided at a predetermined position above the second driven gear 123. For example, as shown in FIG. 1, the home positions of the wind control plates 116a and 116b are the second driven gears 123 corresponding to the positions where the inner surface of the wind control plate 116a and the inner surface of the wind control plate 116b are in a parallel state. Is set to the predetermined position. The number of teeth of each gear 120, 121, 122, 123 is set so that each wind control plate 116a, 116b moves by the same angle.
[0061]
Here, the operation of the paper width wind direction varying means 115 will be described. For convenience of explanation, it is assumed that the wind control plates 116a and 116b operate from the home position shown in FIGS. In accordance with a command from the CPU of the control device 150 shown in FIG. 8 to be described later, for example, as shown in FIG. 7A, a predetermined for moving the wind control plates 116a and 116b outward from the home position. When a number of forward rotation drive pulses are applied to the wind control plate drive motor 129, the wind control plate drive motor 129 is driven to rotate forward (the drive gear 119 is rotated in the clockwise direction in FIG. 5), and the rotational drive force is The first intermediate gear 120, the first driven gear 123, and the wind control plate shaft 117b are sequentially transmitted to open the wind control plate 116b outward from the home position in FIG. 5 (for example, as shown in FIG. 7A). (Clockwise direction) and at the same time, the rotational driving force of the wind control plate drive motor 129 causes the first intermediate gear 120, the second intermediate gear 121, the second driven gear 122, and the wind control. Sequentially transmitted to the shaft 117a, the wind control plate 116a opens to the outside from the home position in FIG. 5 (for example, counterclockwise as shown in FIG. 7A), the same predetermined swing as the wind control plate 116b. Move the moving angle. Therefore, when the wind control plate drive motor 129 is driven to rotate in the clockwise direction in FIG. 5, as shown in FIG. 7A, the wind control plates 116a and 116b are moved outward from the home position. Then, the air blowing port 131a set between the inner surfaces of the free ends of the wind control plates 116a and 116b is widened, and the range of the air blowing A is widened in the paper width direction Y.
[0062]
Contrary to the above, in response to a command from the CPU of the control device 150 shown in FIG. 8, which will be described later, for example, as shown in FIG. 7B, the wind control plates 116a and 116b are closed inward from the home position. When a predetermined number of reverse rotation drive pulses for moving to the wind direction are applied to the wind control plate drive motor 129, the wind control plate drive motor 129 is driven in reverse rotation (the drive gear 119 is rotated counterclockwise in FIG. 5), The rotational driving force is sequentially transmitted to the first intermediate gear 120, the first driven gear 123, and the wind control plate shaft 117b, and the wind control plate 116b is closed inward from the home position in FIG. 5 (for example, FIG. ) And a predetermined swing angle in the counterclockwise direction), and simultaneously, the rotational driving force of the wind control plate drive motor 129 causes the first intermediate gear 120 and the second intermediate gear 121 to rotate. Sequentially transmitted to the second driven gear 122 and the baffle plate shaft 117a, the baffle plate 116a is restrained in the direction to close inward from the home position in FIG. 5 (for example, the clockwise direction as shown in FIG. 7B). It moves at the same predetermined swing angle as the wind plate 116b. Therefore, when the wind control plate drive motor 129 is driven to rotate counterclockwise in FIG. 5, as shown in FIG. 7B, the wind control plates 116a and 116b are closed inward from the home position. The air blowing port 131a is narrowed, and the range of the air blowing A is narrowed in the paper width direction Y.
[0063]
Note that the sheet width wind direction varying means 115 is not limited to this, and if it is possible to increase the size of the apparatus or increase the cost, for example, the wind control plates 116a and 116b are driven independently without being linked. For this purpose, an opening / closing mechanism including two wind control plate drive motors 129 may be used.
[0064]
Next, a detailed configuration of the operation panel 90 will be described with reference to FIG. On the operation panel 90, a plate making start key 91 for setting / inputting the start of each operation from image reading of the document to plate feeding, a numeric key 93 for setting / inputting the number of prints, etc. A print start key 92 for starting the printing operation for the input number of prints and one of five printing speeds of printing speed levels 1 to 5 as a setting value of the printing speed corresponding to the rotational speed of the plate cylinder 1 are selected. A printing speed setting key 96 composed of a speed down key 96a and a speed up key 96b as a printing speed setting means for selectively setting one printing speed, and setting printing set by the speed down key 96a or the speed up key 96b. A speed indicator 97 or the like composed of a group of LED lamps for displaying the speed is arranged.
The “set printing speed: 3rd speed” with hatching is a standard printing speed corresponding to a normally used printing speed, and is automatically set when the speed down key 96a or the speed up key 96b is not pressed. It has come to be. Here, for example, “set printing speed: 1st speed” is the minimum printing speed of 60 sheets / min: 60 rpm, and “set printing speed: 2nd speed” is the printing speed of 75 sheets / min: 75 rpm, “set printing. “Speed: 3rd” is the printing speed of 90 sheets / min: 90 rpm, “Setting printing speed: 4th speed” is the printing speed of 105 sheets / min: 105 rpm, and “Setting printing speed: 5th speed” is the highest printing speed. The speed is set to 120 sheets / min: 120 rpm.
[0065]
The speed indicator 97 is configured to set the printing speed in five stages from 1 to 5 (hereinafter simply referred to as “set printing speed: 1st to 5th” by pressing the speed down key 96a or the speed up key 96b each time. The printing speed that can be switched is displayed in a lit state. The speed down key 96a or the speed up key 96b is disposed in the vicinity of the speed indicator 97, and corresponds to one of the set printing speeds of the set printing speed: 1st to 5th each time the key is pressed once. It also has a function of sequentially switching the lighting of the LED lamps, whereby the set printing speed selected by the operator can be visually confirmed on the speed display 97.
[0066]
In FIG. 8, reference numeral 150 denotes a control device for controlling the air direction of the peeling fan 68 in the paper feeding, printing, and paper discharge processes of the stencil printing apparatus 200, and reference numeral 100 denotes a printing paper P on the plate cylinder 1. Each of the characteristic value detection means groups for detecting the characteristic value of the paper roll-up factor that remains attached to the plate-making master 2 on the plate cylinder 1 without being peeled from the plate-making master 2 is shown.
[0067]
The control device 150 includes a CPU (central processing unit), an I / O (input / output) port, a ROM (read only storage device), a RAM (read / write storage device), a timer, and the like, which are not shown. A microcomputer having a configuration connected by a signal bus is provided.
[0068]
The CPU of the control device 150 (hereinafter, sometimes simply referred to as “control device 150” for the sake of brevity of description) is configured to detect the amount of image constituting the characteristic value detection means group 100 via the input port. Means 101, printing speed detection sensor 62, temperature sensor 103, humidity sensor 104, paper thickness detection sensor 105, paper size detection sensor group 82, first home position sensor 138, and second home The position sensor 128 is electrically connected to each other, and receives an on / off signal and a data signal from each of these sensors.
[0069]
The control device 150 is electrically connected to the fan drive motor 69, the wind control plate drive motor 129, and the duct drive motor 139 via the output port, and each motor drive circuit (not shown) is connected. Various command signals are transmitted to the motors 69, 129, and 139.
[0070]
In the first embodiment, the control device 150 has the following various control functions.
The control device 150 starts the fan drive motor 69 after setting each wind direction in step S7 of the flowchart shown in FIG. 13, and drives the fan so that the air volume becomes constant by rotating the fan at a predetermined rotational speed. It has a function of controlling the motor 69.
[0071]
Based on various output signals from the characteristic value detection means group 100 (image amount detection means 101, printing speed detection sensor 62, temperature sensor 103, humidity sensor 104, paper thickness detection sensor 105), the control device 150 sends air flow A. Has a function of a control means for controlling the duct drive motor 139 so as to hit a preset portion of the printing paper P in the paper transport direction X.
[0072]
Based on the output signal from the paper size detection sensor group 82, the control device 150 controls the wind control plate drive motor 129 so that the air blow A hits a preset portion of the printing paper P in the paper width direction Y. It has the function of.
[0073]
When the leading edge of the printing paper P is clamped by the paper clamper 21 of the impression cylinder 20 and when the leading edge of the printing paper P is separated from the paper clamper 21, the control device 150 causes the blower A to print the printing paper P in the paper transport direction X Each has a function of a control means for controlling the duct drive motor 139 so as to hit a preset part.
[0074]
The ROM in the control device 150 stores in advance a data table as shown in Table 2 and a program shown in FIG. The RAM in the control device 150 inputs and outputs these signals by temporarily storing judgment results and calculation results from the CPU, and storing output signals from each sensor as needed.
[0075]
Hereinafter, specific characteristic value detection means constituting the characteristic value detection means group 100 will be described.
As the thickness detecting means for detecting the thickness of the printing paper P, the paper thickness shown in FIG. 8 is a type of optically detecting and judging the intensity of transmitted light in order to detect the thickness of the printing paper P. A detection sensor 105 is used. The paper thickness detection sensor 105 includes a light emitting element (not shown) provided with an opening in the upper guide plate 38 in the vicinity of the paper leading edge sensor 70 and a lower guide plate 38 facing the light emitting element. And a light-receiving element (not shown) provided with an opening. The paper thickness detection sensor 105 sets a reference light amount detected by the light receiving element when the light emitting element and the light receiving element are not obstructed, and the printing paper P detects the light emitting element and the light receiving element. The transmitted light amount of the printing paper P is obtained by comparing the reference light amount with the light amount detected by the light receiving element when passing through the paper transport path R between the elements, and the thus obtained transmitted light amount Based on the above, the thickness of the printing paper P is detected.
The thickness detection means is not limited to the paper thickness detection sensor 105, but, for example, as shown in FIG. 11 of Japanese Patent Laid-Open No. 9-193526, a gap between rollers is mechanically measured. A type that is enlarged and detected by an electrical sensor (for example, a potentiometer in the example shown in FIG. 11 of JP-A-9-193526) may be used.
[0076]
A temperature sensor 103 is used as temperature detection means for detecting the temperature inside the main body frame 201. The temperature sensor 103 is a thermistor and is disposed on the paper discharge side plate 114 a near the peeling fan 68.
A humidity sensor 104 is used as a humidity detection means for detecting the humidity inside the main body frame 201. The humidity sensor 104 is disposed on the paper discharge side plate 114 a in the vicinity of the peeling fan 68.
In the first embodiment, the temperature sensor 103 and the humidity sensor 104 are disposed inside the main body frame 201 in order to grasp the temperature and humidity as the actual environmental state as accurately as possible. If it cannot be placed inside the main body frame 201 due to layout constraints such as the above, the outer wall surface of the main body panel outside the main body frame 201 or the stencil printing apparatus 200 is installed to detect the temperature and humidity around the main body frame 201. You may arrange | position around a part. That is, the temperature detection means and the humidity detection means may be arranged to detect at least one of the temperature and humidity inside and outside the main body frame 201.
[0077]
As the image amount detection means 101 for detecting the image amount of the image printed on the printing paper P, the same means as described in paragraph (0033) of JP-A-9-193526 is used. That is, with respect to the number of heating elements necessary for punching and making the entire master 2 for one plate, the master 2 is obtained from image information actually read by a scanner (not shown) or the like of the document reading device 58. The amount of the image printed on the printing paper P is detected by determining the ratio of the number of heat generating elements used for heat drilling and plate making. The image amount detection unit 101 receives, for example, an analog image electric signal read and converted by an image sensor via the scanner of the document reading device 58 and the like, and a digital image electric signal converted by the A / D conversion unit. Is received via the image signal processing device and temporarily stored as image data, and the image data once stored in the image area memory are sequentially called up, and one version corresponding to one plate formed on the master 2 The image signal processing apparatus includes a function of starting a thermal head drive control unit that detects and recognizes the image amount of a plate-making image and drives and controls the thermal head 17.
[0078]
The operation of the stencil printing apparatus 200 will be described with reference to the flowchart of FIG.
In step S1 of FIG. 13, it is determined whether or not it is possible to start plate making. That is, first, a document is set on a document table (not shown) of the document reading device 58, and a plate making start key 91 is pressed, whereby a plate discharging operation and a plate making operation are performed in parallel with the document image reading operation. As shown in FIG. 12, the plate cylinder 1 rotates and occupies the home position, and the used master is separated from the outer peripheral surface of the plate cylinder 1 by the plate discharging unit 18 and discarded. After that, the plate cylinder 1 stops at a position where the master clamper 12 occupies the plate feeding position located substantially on the right side in FIG. 12, and the master clamper shaft 12a is rotated by the operation of the opening / closing device, whereby the master clamper 12 Is opened, and the printer is in a standby state.
When the pulse motor 6 of the plate making unit 19 is driven, the platen roller 9 starts to rotate and the master 2 is conveyed while being fed out. On the other hand, when the scanner operates in the document reading device 58, an image of the document is read by the image sensor, processed by the A / D conversion unit, the image processing device, the thermal head drive control unit, and the like and sent out. By the digital image signal, the heat generating element of the thermal head 17 is selectively heated, and the master 2 starts to be selectively heated and punched according to the image information. At this time, the image amount is detected by the image amount detection means 101, and an output signal related to the image amount is transmitted to the control device 150 and stored in the RAM of the control device 150 as image amount data (see step S2). .
[0079]
The master 2 is conveyed by the rotation of the platen roller 9, and the front end portion of the master 2 is sent out toward the master clamper 12 that is widened in the plate feeding standby state. When the number of steps of the pulse motor 6 reaches a certain set value, the master clamper shaft 12a is rotated by the opening / closing device to close the master clamper 12, and the leading end of the master 2 that has been subjected to plate making becomes the master clamper 12. Clamped.
[0080]
Simultaneously with this clamping operation, the plate cylinder 1 and the impression cylinder 20 are rotated at a circumferential speed that is substantially the same as the conveying speed of the master 2, and the master 2 that has been subjected to plate making is wound around the outer peripheral surface of the plate cylinder 1. When the master 2 having been subjected to plate making is wound around the outer peripheral surface of the plate cylinder 1 for a predetermined length, the rotation of the plate cylinder 1, the impression cylinder 20, and the platen roller 9 is stopped. Simultaneously with this stop operation, the cutter drive motor 7 is rotated and the eccentric cam 8 lowers the upper cutter member 4 to cut the master 2. Then, the plate cylinder 1 is rotated in the clockwise direction again, and the rear end (not shown) of the cut master 2 is pulled out from the plate making unit 19, and the master 2 that has been subjected to plate making is completely attached to the outer peripheral surface of the plate cylinder 1. The plate making and plate feeding operations are completed after winding (see step S3).
[0081]
Subsequently, each process of paper feeding, printing, and paper ejection will be described.
After the plate making / plate feeding operation is completed, prior to the paper feeding operation, the paper feeding table 31 is raised, and the uppermost printing paper P occupies the paper feedable paper position in contact with the calling roller 30 and the separation roller 32. Before or after the time, the size of the printing paper P is detected by the paper size detection sensor group 82 (see step S4).
When the impression cylinder 20 rotates counterclockwise from the home position and occupies 194 ° at the rotation position of the impression cylinder 20, the light shielding plate 55 passes through the paper feed start sensor 54, so that its ON output signal Is input to a control device (not shown), and after a certain delay time has elapsed since the ON output signal was input, the paper feed motor 50 is driven to rotate. As a result, the paper feeding roller 32 is rotated in the clockwise direction, and at the same time, the printing paper P is fed by the rotation of the calling roller 30 in the same direction. Is prevented, and only the topmost printing paper P on the paper feed tray 31 is fed toward the registration roller pair 33a, 33b. When the leading edge of the printing paper P is detected by the paper leading edge sensor 70 disposed on the downstream side in the paper conveying direction X from the separation roller 32, the paper leading edge sensor 70 is turned on, and the ON output signal is input to the control device. Is done. At this time, the printing speed is detected as the rotation speed of the plate cylinder 1 by the printing speed detection sensor 62. The printing speed at this time is such that the first printing paper P after the plate making / plate feeding operation ends is fed and used for so-called “print printing”. For example, the printing speed is preset to 16 rpm, and the printing speed is detected by the printing speed detection sensor 62. However, as is conventional, there is no problem if the user sets the printing speed on the operation panel and determines the control conditions based on the set printing speed.
Before and after this printing speed detection, the temperature sensor 103 detects the temperature in the main body frame 201, and the humidity sensor 104 detects the humidity in the main body frame 201. At the same time, the thickness of the printing paper P is detected by the paper thickness detection sensor 105 (see steps S5 and S6).
[0082]
The feeding amount of the printing paper P at this time is such that the leading edge of the printing paper P collides with the position immediately before the nip portion of the registration roller pair 33a, 33b and a predetermined amount of curved deflection is formed. In response to the command, a predetermined drive pulse is output to the paper feed motor 50 to feed the print paper P by a predetermined amount (deflection adjustment). As a result, when a predetermined amount of curved deflection is formed above the leading end of the printing paper P, the rotation of the paper feeding motor 50 is stopped, and the separation roller 32 and the calling roller 30 are stopped. This predetermined amount of curved deflection does not cause skew or non-feeding of the printing paper P due to the rotation of the registration roller pair 33a and 33b, and has been tested in advance within a certain range where the amount of deflection is appropriate and noise reduction can be achieved. Is set in
By such a specific deflection amount adjustment by the control device, the leading edge of the printing paper P collides with the nip portion of the registration roller pair 33a, 33b at a constant feed speed, and a certain amount of curved deflection is formed. Since the paper feed motor 50 is controlled so as to be the feed amount of the printing paper P, a stable deflection amount adjustment can be performed regardless of the printing speed.
[0083]
Before and after the deflection amount adjusting operation, the process proceeds to step S7, where the image amount data obtained in step S2 and the size of the printing paper P obtained in step S4 (hereinafter sometimes referred to as “paper size”) data. Based on the printing speed data, temperature data, humidity data, and printing paper P thickness data obtained in step S6, a wind control plate drive motor 129 of the paper width wind direction varying means 115 and Each wind direction is set by controlling the duct drive motor 139 of the up-and-down wind direction varying means 130, respectively.
[0084]
The following control is performed based on the paper size data. As shown in FIG. 7A and FIG. 7C, for example, when printing on A3 size printing paper P having a large paper size in the paper width direction Y, the control device 150 detects from the paper size detection sensor group 82. From the one side end of the sheet width direction Y of the A3 sheet, which is a preset part of the A3 sheet in the sheet width direction Y, based on the output signal (sheet size data of the sheet width direction Y of the A3 sheet) The wind control plate drive motor 129 is controlled so as to move the wind control plates 116a and 116b in the direction of opening outward from the home position so as to reach the other end. As described above, when each of the air control plates 116a and 116b moves in the opening direction, the air blow A discharged from the air blowing port 131a is uniformly and efficiently applied over the entire sheet width direction Y of the A3 sheet. Become.
Contrary to the above, as shown in FIG. 7B and FIG. 7C, for example, when printing on a postcard having a small paper size in the paper width direction Y, the control device 150 uses the paper size detection sensor group. Based on the output signal from 82 (paper size data in the paper width direction Y in the postcard), the air blow A is from one end of the paper width direction Y in the postcard, which is a preset part of the postcard in the paper width direction Y. The wind control plate driving motor 129 is controlled so as to move the wind control plates 116a and 116b in the direction of closing inward from the home position so as to reach the side ends. As described above, when each of the air control plates 116a and 116b moves in the closing direction, the air blow A discharged from the air blowing port 131a is uniformly and efficiently applied over the entire sheet width direction Y of the postcard. . In the chart of FIG. 7C, as the paper size of the printing paper P increases from small to large, the moving direction of the air control plates 116a and 116b can be adjusted stepwise from the closing direction to the opening direction. Represents.
[0085]
Therefore, when printing on the printing paper P having a different paper size in the paper width direction Y and peeling the printing paper P from the plate cylinder 1, the entire paper width direction Y of the printing paper P that needs to be blown A is applied. By applying the air blow A uniformly and efficiently, the air blow A is applied to a portion of the printing paper P that does not need the paper width direction Y, and on the contrary, to the portion of the printing paper P that requires the paper width direction Y. If the blower A cannot be applied, the printing paper P can be prevented from being blown out, and the useless blower A can be eliminated.
[0086]
Next, based on the image amount data, the printing speed data, the temperature data, the humidity data, and the thickness data of the printing paper P, the following control is performed for each printing condition. Qualitatively summing up the degree of paper roll-up for each printing condition, as detailed in the prior art, generally, as shown in Table 1, from experience.
[0087]
[Table 1]

[0088]
In Table 1, under the printing conditions in which the paper roll is likely to occur, the front end portion of the printing paper P is the plate in FIG. 3B shown in the front view as viewed from the end surface side of the plate cylinder 1. After being pressed at the nip N between the cylinder 1 and the impression cylinder 20, the leading end of the printing paper P separated from the sheet clamper 21 of the impression cylinder 20 is in close contact with the outer peripheral surface of the plate cylinder 1 and is not easily peeled off. Therefore, the printing paper P is separated from the front end of the printing paper P closer to the downstream side in the paper transport direction X from the position where the printing paper P is peeled off from the outer peripheral surface of the plate cylinder 1 in the vicinity of the nip N, in other words, away from the paper clamper 21. In FIG. 3B, the air blowing port 131a of the movable duct 131 is oscillated and displaced downward so that the air A discharged from the air blowing port 131a hits the leading edge of the printed paper P.
Contrary to the above-described case, under the printing conditions in which paper roll-up hardly occurs, the front end of the printing paper P in FIG. 3A shown in the front view as viewed from the end surface side of the plate cylinder 1 is shown. After the portion is pressed at the nip N between the plate cylinder 1 and the impression cylinder 20, the printing paper P separated from the paper clamper 21 of the impression cylinder 20 (however, the printing paper P having a strong stiffness like a thick paper or an envelope is The leading end of the sheet clamper 21 that performs a specific sheet transport operation that is not clamped by the sheet clamper 21 is easily peeled off from the outer peripheral surface of the plate cylinder 1, so that the printing paper P is removed from the outer peripheral surface of the plate cylinder 1 near the nip N portion. By adjusting the blower A discharged from the blower port 131a to a position closer to the upstream side in the paper conveyance direction X, which is a peeling position, the blower port 131a of the movable duct 131 is moved upward in FIG. Oscillate and displace.
[0089]
Here, in FIGS. 3A and 3B, for example, taking the difference in thickness of the printing paper P as an example, the plate cylinder 1 under the printing conditions in which all other printing conditions are fixed to the same conditions. Let us compare and examine how the printing paper P is peeled off from the outer peripheral surface.
For example, among the printing paper P, a thick paper such as a postcard or drawing paper having a relatively thick printing paper P is stiff and generally has a characteristic that ink does not easily penetrate into the fiber. The rise is unlikely to occur. In such a thick paper, the leading end portion of the printing paper P printed at the nip N portion is hit by the air blow port 131a of the peeling fan 68 shown in FIG. Since the sheet is conveyed while being peeled off by its own waist strength so as to fly upward, the leading end of the cardboard and the outer periphery of the plate cylinder 1 at a position where they pass from the outer peripheral surface of the plate cylinder 1 past the nip N portion. By applying the air blow A discharged from the air blowing port 131a to the surface, a certain amount of air flow is adjusted so as not to be used for peeling of the printing paper P, so that the movable duct 131 in FIG. The air outlet 131a is oscillated and displaced upward.
Contrary to the above thick paper, for example, in the printing paper P, the additional paper having a relatively thin printing paper P has a low stiffness and generally has a characteristic that ink easily penetrates into the fiber. The paper rolls up easily. In such a sheet renewal, the front end portion of the printing paper P printed at the nip N and separated from the paper clamper 21 is stuck on the plate cylinder 1 by the adhesive force of the ink, so that it passes the vicinity of the nip N. In FIG. 3A, the air blowing port 131a of the movable duct 131 is swung downward so that the air blow A discharged from the air blowing port 131a is applied to the front end of the printing paper P separated from the paper clamper 21. Displace.
[0090]
As described above, in the control device 150, the air blow A hits a preset portion of the printing paper P in the paper transport direction X based on various output signals from the characteristic value detection means group 100 excluding the paper size detection sensor group 82. Thus, the duct drive motor 139 is controlled.
[0091]
In addition to the degree of paper roll-up caused by the combination of the above printing conditions, in the first embodiment, the pressure drum 20 is used as the pressing means. The swing displacement position of the air outlet 131a is finally determined. That is, when the leading end of the printing paper P is clamped by the paper clamper 21 of the impression cylinder 20 and when the leading end of the printing paper P is separated from the paper clamper 21, the leading edge of the printing paper P is prevented from being blown off, and the paper clamper The swing displacement position of the air blowing port 131a of the movable duct 131 is set so that the leading end portion of the printing paper P released from 21 can be stably conveyed. That is, when the leading end of the printing paper P is clamped by the paper clamper 21 of the impression cylinder 20 and when the leading end of the printing paper P is separated from the paper clamper 21, the control device 150 performs printing in the paper transport direction X. The duct drive motor 139 is controlled so as to hit each preset part of the paper P.
(Example)
An example in which the position of the air blowing port 131a of the movable duct 131 is set in advance based on an experiment or the like for each of the combinations of printing conditions in which the paper winding is least likely to occur and the paper winding is most likely to occur. Is shown in Table 2.
[0092]
[Table 2]

[0093]
In Table 2, the position of the air duct 131a of the movable duct 131 is the uppermost position, as shown by the broken line in FIG. 4 shows a position that is oscillated and displaced upward from the position (shown by a solid line in FIGS. 4A and 4B). At this uppermost position, the air A discharged from the air outlet 131a of the movable duct 131 is sent to the printing paper P. It includes releasing a certain amount of the air blow A so that it is not used for all the peeling. On the contrary, the position of the air outlet 131a of the movable duct 131 being at the lowest position corresponds to the case where the sheet is most likely to roll up as indicated by a broken line in FIG. 4B. In this lowermost position, the blower A discharged from the blower port 131a of the movable duct 131 is used efficiently for peeling the printing paper P. Adjust to.
[0094]
In Table 2, each printing condition when the position of the air blowing port 131a of the movable duct 131 is the home position is an example of a combination of the printing conditions when the paper rolls up moderately, and the thickness of the printing paper P Is that of high-quality 55kg paper (PPC paper), in a standard state with a temperature of 23 ° C and humidity of 65% (relative humidity: RH percent), a printing speed of 3rd speed, and an image amount of 20% (characters only) In the printing conditions in this case, when the position of the air blowing port 131a of the movable duct 131 is set to the home position as shown in FIG. 4, the paper roll-up can be optimally prevented. Yes.
In Table 2, each printing condition when the position of the air blowing port 131a of the movable duct 131 is the uppermost position is an example of a combination of the printing conditions when the paper roll-up hardly occurs, and the thickness of the printing paper P is It is that of drawing paper (180 kg paper), the temperature is 10 ° C., the humidity is 20% (relative humidity: RH percent), the printing speed is 5 speed, and the image amount is 7% (no solid image with only characters). In this case, under the printing conditions in this case, when the position of the air blowing port 131a of the movable duct 131 is set to the uppermost position as shown in FIG. In Table 2, each printing condition when the position of the air blowing port 131a of the movable duct 131 is at the lowest position is an example of a combination of the printing conditions when the paper is likely to roll up, and the thickness of the printing paper P is Renewed paper, temperature is 30 ° C., humidity is 90% (relative humidity: RH percent), printing speed is 1 speed (excluding printing speed for printing), and image amount is 50% (printing paper P) In the printing conditions in this case, when the position of the air outlet 131a of the movable duct 131 is set to the lowest position as shown in FIG. It represents what can be prevented.
[0095]
Further, in Table 2, another printing condition when the position of the air outlet 131a of the movable duct 131 is the lowest position is, for example, a case where the sheet winding is likely to occur moderately and the case where it is most likely to occur. This is an example of a combination of printing conditions, the thickness of the printing paper P is that of PPC paper, the temperature is 23 ° C., the humidity is 65% (relative humidity: RH percent), and the printing speed is 1 speed (for printing) 4), and the amount of image is 80% (only a solid image such as a poster). Under the printing conditions in this case, the position of the air outlet 131a of the movable duct 131 is set as shown in FIG. This shows that paper roll-up can be optimally prevented when the lowermost position is set.
[0096]
Next, when the impression cylinder 20 further rotates counterclockwise and occupies 307 ° at the rotation position, the light shielding plate 56 passes through the paper feed start sensor 54, so that the ON output signal is sent to the control device. After a certain delay time has elapsed since the ON output signal was input, the paper feed motor 50 is driven to rotate simultaneously with the registration motor 52. As a result, the registration roller 33b is rotated counterclockwise, the feeding of the leading edge of the printing paper P toward the paper clamper 21 of the impression cylinder 20 is started, and the separation roller 32 is simultaneously rotated at a low speed for a while. Thus, the noise generated when the deflection of the printing paper P disappears rapidly is reduced.
[0097]
Before and after the registration motor 52 is driven to rotate, the position of the air blowing port 131a of the movable duct 131 is held at the position corresponding to each wind direction as described above, from the air blowing port 131a of the movable duct 131. Blast A is started (see step S8).
[0098]
When the pair of registration rollers 33a and 33b are rotated and the leading edge of the printing paper P is conveyed by a predetermined amount downstream from the position where the leading edge of the printing paper P hits the nip portion of the registration rollers 33a and 33b, The sensor 71 is turned on, and the ON output signal is input to the control device. At this time, since the distance from the abutting position of the printing paper P to the registration position of the registration sensor 71 at the nip between the registration roller pairs 33a and 33b is constant, the drive pulse count of the registration motor 52 should be constant. Slip is likely to occur during the initial rotation of the registration roller pair 33a and 33b. For this reason, the drive pulse count until the registration sensor 71 is turned on may change for each sheet. Therefore, the control device determines the delay of the printing paper P from the drive pulse count until the registration sensor 71 is turned on, increases the rotation speed of the registration motor 52 thereafter, and increases the rotation amount to correct the slip amount. do.
[0099]
After the above-described slip amount correction is completed, the control device takes in the output pulse signal from the encoder sensor 121 and feeds the leading edge of the printing paper P in synchronization with the paper holding position of the paper clamper 21 in response thereto. Therefore, so-called feedback control for controlling the registration motor 52 is performed. As described above, the sheet feed amount that the registration motor 52 feeds the printing sheet P in one pulse and the outer peripheral movement amount of the impression cylinder 20 corresponding to one pulse width of the encoder 120 are set to be the same. Thereby, for example, the control device detects the time required for one pulse width of the encoder 120 fixed to the impression cylinder 20 by the timer in the control device, and the registration motor 52 is detected by a load variation on the impression cylinder 20 side. When the time required for one pulse becomes longer, the registration motor 52 is decelerated. On the contrary, the control device 150 performs feedback control to increase the speed of the registration motor 52 when the time required for one pulse of the registration motor 52 is shortened, thereby reducing the registration error and improving the printing resist accuracy. I am trying.
[0100]
The impression cylinder 20 is driven by the main motor at a rotational speed (peripheral speed) corresponding to a set printing speed value set by a printing speed setting key (not shown) provided on an operation panel or the like. It is rotating. The printing paper P is conveyed at a feed speed 1.4 times the circumferential speed of the impression cylinder 20. When the paper clamper 21 of the impression cylinder 20 is about to close, the printing paper P catches up with the paper clamper 21 and the circumferential speed of the impression cylinder 20. It becomes the same speed.
[0101]
The paper clamper 21 of the impression cylinder 20 is opened at a predetermined timing shown in FIG. 2 (in the example, when the impression cylinder 20 occupies a position rotated 350.5 ° counterclockwise from the home position). Under the encoder feedback control by the control device, the registration roller 33b is rotated counterclockwise, and the upper registration roller 33a is driven to rotate clockwise via the printing paper P, thereby printing. The curved deflection of the paper P disappears. At this time, due to the action of each one-way clutch, the separation roller 32 and the calling roller 30 are driven and rotated by the conveyance of the printing paper P, while the leading edge of the printing paper P is conveyed toward the paper clamper 21 of the impression cylinder 20, The bumper hits and collides with the clamper 21.
At this time, the air A discharged from the air blowing port 131 a of the movable duct 131 is slightly in the paper width direction Y of the printing paper P from a slight gap between the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the impression cylinder 20. It is sprayed throughout. The air blow A at this time can arrange the front end portion of the print paper P over the entire paper width direction Y of the print paper P without hindering the clamping operation of the front end portion of the print paper P by the paper clamper 21. It is something that is sprayed on.
[0102]
The paper clamper 21 of the impression cylinder 20 clamps the leading edge of the printing paper P after the leading edge of the printing paper P collides with the paper clamper 21, and then the paper clamper 21 is closed. The paper P is rotated while being held on the outer peripheral surface of the impression cylinder 20, and the leading end of the printing paper P is conveyed between the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the impression cylinder 20.
With respect to the printing paper P conveyed between the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the impression cylinder 20, the impression cylinder 20 is brought into contact with the outer peripheral surface of the plate cylinder 1 by the printing pressure springs 26a and 26b. The nip portion is formed by the upward and downward swinging displacement, and the outer peripheral surface of the impression cylinder 20 presses the printing paper P against the outer peripheral surface of the plate cylinder 1. In this way, by pressing the outer peripheral surface of the impression cylinder 20, the printing paper P is continuously pressed against the master 2 that has been wound around the outer peripheral surface of the rotating plate cylinder 1. In addition to being in close contact with the outer peripheral surface of the plate cylinder 1, ink oozes out from the opening portion of the plate cylinder 1 to the perforated portion of the master 2 that has been made, and is transferred to the surface of the printing paper P to perform plate printing. .
At this time, the ink roller 13 also rotates in the same direction as the rotation direction of the plate cylinder 1. The ink 14 in the ink reservoir 16 is attached to the surface of the ink roller 13 by the rotation of the ink roller 13, and the amount of the ink 14 is regulated when passing through the gap between the ink roller 13 and the doctor roller 15. (Refer to step S9).
[0103]
During this time, the above-described pulse encoder / feedback control is performed by the control device. Then, the registration motor 52 is rotationally driven by the control device by an amount stored in the ROM of the control device (in the embodiment, the impression cylinder 20 is 75 ° (435 °) counterclockwise from the home position). The rotation of the registration motor 52 is stopped, and the feedback control by the control device is terminated.
[0104]
When the impression cylinder 20 further rotates and the paper clamper 21 is opened at the paper discharge position before the paper discharge claw 44, the air blow A from the air outlet 131a of the movable duct 131 in which the respective wind directions are set as described above. The front end of the opened printing paper P is sprayed on the portion of the printing paper P between the plate cylinder 1 and the printing paper P in the paper transport direction X set in advance to prevent the paper from rolling up. It sprays so that the front-end | tip part of the printing paper P can be conveyed stably, suppressing the exposure of a part.
As a result, the front end portion of the printing paper P separated from the paper clamper 21 is delivered to the paper discharge claw 44 while being uniformly peeled off from the plate cylinder 1 without sticking onto the plate cylinder 1. The printing paper P peeled off from the plate cylinder 1 in this manner is conveyed while being sucked onto the conveying belt 48 by the suction fan 49 and discharged and stacked on the paper discharge tray 45. In this way, the plate making master 2 is filled with ink, and the plate making master 2 is brought into close contact with the outer peripheral surface of the plate cylinder 1, and the plate cylinder 1 is separated from the impression cylinder 20 to be in an initial state. The printer returns to a print standby state (see step S10).
[0105]
After finishing printing, the operator visually checks the discharged printed matter, confirms the print image quality, confirms the print image position, etc. If these are okay, set the number of prints with the numeric keypad 93 and start printing. By depressing the key 92, each of the paper feeding, printing, and paper ejection steps is repeated for the set number of printed sheets. Thereafter, the driving of the peeling fan 68 is stopped to end the blowing, and the stencil printing is performed. All the processes are completed (see steps S11 to S14).
Here, the operation at the time of printing to obtain a regular printed material after plate printing and the operation at the time of paper discharge differ from the plate printing operation only in relation to the following printing speed. Since the printing speed setting key 96 is not pressed, the printing speed at this time is automatically set to the standard printing speed “set printing speed: 3rd speed” corresponding to the normally used printing speed. Thereby, the plate cylinder 1 and the impression cylinder 20 are rotated by the main motor 60 so as to have a printing speed corresponding to the set printing speed: the third speed. Each process of paper feeding and printing after the leading edge of the printing paper P is fed from the nip portion of the pair of registration rollers 33a and 33b has been described above with a paper conveyance speed and a printing speed corresponding to the set printing speed: 3rd speed. A peculiar conveyance operation and printing operation of printing paper P are performed. In addition, since the printing speed as the printing condition is changed from the plate printing speed (16 rpm) to the set printing speed: third speed (90 rpm), the control device 150 is based on the output signal relating to the changed printing speed, In consideration of this, the air directions of the air blow A from the air blowing port 131a of the movable duct 131 are set in the same manner as described above.
(Modification 1 of Embodiment 1)
14 and 15 show a first modification of the first embodiment. As shown in FIGS. 14 and 15, the first modification is different from the first embodiment shown in FIGS. 1 to 13 in that the paper size for setting the paper size is used instead of the paper size detection sensor group 82. The main difference is that it has a paper size input key 84 as setting means and that it has a control device 150A instead of the control device 150.
[0106]
In FIG. 15, reference numeral 90 </ b> A indicates an operation panel according to the first modification. The operation panel 90 </ b> A according to the modified example 1 is a paper for displaying the paper size input key 84 and the paper size selectively set by the paper size input key 84 as compared with the operation panel 90 of the first embodiment. The only difference is that a lamp group 85 made up of size display LEDs (light emitting diodes) is provided.
In this example, the lamp group 85 selects three lamps that indicate that one of the three paper sizes A3, A4, and B5 is selected, that is, the printing paper P having the paper size A3. A lamp 85a for indicating that the printing paper P of paper size A4 is selected, and a lamp 85c for indicating that the printing paper P of paper size B4 is selected. . When the paper size input key 84 is pressed once, the lamp 85a is lit, when the key 84 is pressed twice, the lamp 85b is lit, and when the key 84 is pressed three times, the lamp 85c is lit. Each time the button is pressed, the lighting of the lamp is sequentially switched to display that the paper size set by the operator is selected.
[0107]
Compared to the control device 150 of the first embodiment, the control device 150A of the first modification example uses the air blow A in the paper width direction based on the output signal from the paper size input key 84 instead of the paper size detection sensor group 82. The difference is that it has a function of a control means for controlling the wind control plate drive motor 129 so as to hit a preset portion of the printing paper P in Y. Since the operation of the stencil printing apparatus 200 in the first modification having the above configuration can be easily analogized from the first embodiment, the description thereof will be omitted. In the block diagram of FIG. 14, only main control target components and control configurations are shown for the sake of simplicity, and detailed control target components such as the lamp group 85 are not shown.
(Modification 2 of Embodiment 1)
16 and 17 show a second modification of the first embodiment. As shown in FIGS. 16 and 17, the second modification has a sheet thickness detection as a thickness detection unit that detects the thickness of the print sheet P as compared with the first embodiment shown in FIGS. 1 to 13. The main difference is that instead of the sensor 105, a paper type input key 94 as a paper type setting means for setting the type of the printing paper P is provided, and that a control device 150B is provided instead of the control device 150.
[0108]
In FIG. 17, reference numeral 90 </ b> B indicates an operation panel according to the second modification. Compared with the operation panel 90 of the first embodiment, the operation panel 90B of the second modification has the above-described paper type input key 94 and the type of printing paper P that is selectively set by the paper type input key 94 (hereinafter, referred to as the operation panel 90B). The only difference is that a lamp group 95 made up of LEDs (light emitting diodes) for displaying paper type for displaying “paper type” is sometimes provided.
In this example, the lamp group 95 includes three lamps that indicate that any one of the three groups is selected, that is, lamps that indicate that standard paper (plain paper) is selected. 95a, a lamp 95b for indicating that the thick paper is selected, and a lamp 95c for indicating that the thin paper is selected. When the paper type input key 94 is pressed once, the lamp 95a is turned on, when the key 94 is pressed twice, the lamp 95b is turned on, and when the key 94 is pressed three times, the lamp 95c is turned on. Each time the button is pressed, the lamps are turned on sequentially to indicate that the paper type set by the operator is selected.
[0109]
  As compared with the control device 150 of the first embodiment, the control device 150B according to the second modification uses the air flow A based on the output signal from the paper type input key 94 instead of the output signal from the paper thickness detection sensor 105. Is different in that it has a function of a control means for controlling the wind control plate drive motor 129 so as to hit a preset part of the printing paper P in the paper width direction Y. The operation of the stencil printing apparatus 200 in Modification 2 having the above-described configuration can be implemented by analogy with Embodiment 1 and will not be described.
  In the block diagram of FIG. 16, only main control target components and control configurations are shown for the sake of simplicity, and detailed control target components such as the lamp group 95 are not shown.
(Embodiment 1Reference example 1)
  18 and 19 show the first embodiment.Reference example 1Indicates.Reference example 1Compared with the first embodiment, the main difference is that a peeling fan 165 is provided instead of the peeling fan 68 of the first embodiment.
  Reference example 1The peeling fan 165 is disposed at the same position as the peeling fan 68 of the first embodiment shown in FIG. The peeling fan 165 is integrated with a fan unit 68a including a fan drive motor 69 schematically shown in FIG. 18 and a fan (not shown) that is rotationally driven by the fan drive motor 69, and the fan unit 68a. And a fixed duct 167 that introduces and blows air generated by the fan part 68a, and has a different configuration from the conventional separation fan, that is, changes the direction of the air A from the fan part 68a via the fixed duct 167. It has a wind direction variable means. The wind direction varying means is composed of vertical wind direction varying means 166 that changes the direction of the air blow A in the vertical direction Z between the plate cylinder 1 and the printing paper P and viewed from the end surface side of the plate cylinder 1.
[0110]
The up-and-down air direction varying means 166 includes an air-blowing port 167a that discharges the air A, and serves as an up-and-down air-direction variable member that can swing in the up-and-down direction Z so as to change the direction of the air A discharged from the air-blowing port 167a to the up-and-down direction Z. A shutter 168 and a shutter opening / closing mechanism 174 provided with a shutter drive motor 169 as drive means for driving the shutter 168 in the vertical direction Z when viewed from the end surface side of the plate cylinder 1 are provided.
[0111]
The open end side of the fixed duct 167 is formed in a wide-mouth shape similar to the movable duct 131. A rectangular air vent hole 173 for selectively releasing the air introduced into the fixed duct 167 is formed in the lower wall of the fixed duct 167 on the wide mouth shape side.
The shutter 168 is formed into a plate shape using, for example, a sheet metal or an appropriate synthetic resin, and has a trapezoidal shape with a long front side in the plan view. The free end of the shutter 168 extends to near the open end of the fixed duct 167, and the base end of the shutter 168 passes through the left and right side walls of the fixed duct 167 at the upper part near the toe end of the wide-mouthed portion of the fixed duct 167. It is fixed to a shaft 168a that is movably supported. A light shielding piece 172 protruding from an opening 167 b opened in the right side wall of the fixed duct 167 is integrally formed on the right side surface portion on the free end side of the shutter 168. By swinging the shutter 168 about the shaft 168a, the area of the air blowing port 167a can be varied, and the air direction of the air blowing A from the air blowing port 167a can be changed in the vertical direction Z.
[0112]
The shutter opening / closing mechanism 174 includes the shutter 168, a driven gear 171 fixed to the shaft end of the shutter shaft 168a, and a shutter attached and fixed to a paper discharge side plate (not shown in FIG. 18) in the vicinity of the driven gear 171. A drive motor 169, a drive gear 170 fixed to the output shaft 169a of the shutter drive motor 169, meshed with the driven gear 171 and a paper discharge side plate in the vicinity of the driven gear 171 are fixed to the shutter light shielding piece 172. And a shutter home position sensor (not shown) for detecting the home position of the shutter 168 in the vertical direction Z.
The shutter drive motor 169 is a stepping motor. The shutter home position sensor includes a transmissive optical sensor having a light emitting part and a light receiving part. The home position of the shutter 168 is set corresponding to a position where the shutter 168 is in parallel with the inner surface of the upper wall of the wide-portion shaped portion of the fixed duct 167. Here, the operation of the up / down air direction varying means 166 will be described. When a predetermined drive pulse is supplied to the shutter drive motor 169, the shutter drive motor 169 is rotationally driven clockwise in FIG. 18, and the rotational drive force is sequentially transmitted to the drive gear 170, the driven gear 171 and the shaft 168a. As a result, the shutter 168 swings clockwise from the home position indicated by the solid line in FIG. When the free end of the shutter 168 swings to the lowest position as shown by the phantom line in FIG. 19, the air blowing port 167a is completely closed, so that the air A introduced into the fixed duct 167 hits the shutter 168 and lowers the wind direction. By changing the direction, the air escapes downward from the air vent hole 173.
Therefore, by changing the number of drive pulses supplied to the shutter drive motor 169, the swing angle of the shutter 168 can be changed stepwise, and thus the air blow A from the air outlet 167a of the fixed duct 167 is desired. Can be changed stepwise in the vertical direction Z. At the same time, as the shutter 168 swings clockwise from the home position indicated by the solid line in FIG. 19, the amount of air blow A that escapes downward from the air vent hole 173 can be varied. For example, when the sheet is likely to roll up and the air A from the air outlet 167a of the fixed duct 167 is desired to be downward, the shutter 168 is swung clockwise from the home position indicated by the solid line in FIG. As shown to Fig.20 (a), what is necessary is just to change the ventilation A from the ventilation port 167a to a downward direction. On the other hand, when paper roll-up hardly occurs and air blowing A from the air blowing port 167a of the fixed duct 167 is unnecessary, the free end of the shutter 168 is virtually shown in FIG. 19 as shown in FIG. By swinging to the lowest position as indicated by the line, the blower port 167a is closed by the shutter 168, and the blower A is allowed to escape downward from the air vent hole 173.
[0113]
  Reference example 1However, it goes without saying that the operation described with reference to Table 2 can be easily performed in the same manner as in the first embodiment, the first and second modifications, and the like. The peeling fan 165 is not limited to the structure described above. For example, the base end position of the shutter 168 with respect to the fixed duct 167 is disposed on the lower side in FIG. 19 and the air vent hole 173 is formed above the fixed duct 167. You may form in a wall.
[0114]
  Embodiment 1 or Modification 1, 2, Reference Example 1In the above description, the printing apparatus is of the paper-carrying impression cylinder type. However, as shown in FIG. 21, the printing apparatus can be applied to a stencil printing apparatus 200A using a press roller 40 as pressing means.
  The press roller 40 has a function as a pressing unit that presses the printing paper P fed from the paper feeding unit 29 against the plate cylinder 1 via the master 2 that has been made and makes a print image on the printing paper P. . The press roller 40 is rotatably supported by the arm shaft 42 at the base end portion of each roller arm 41 disposed in a pair on the front side and the back side of the paper surface, and can be contacted and separated from the outer peripheral surface of the plate cylinder 1. Is provided. The printing pressure of the press roller 40 against the plate cylinder 1 is applied by a tension spring (not shown) stretched on each roller arm 41, and the biasing force of the tension spring causes the roller arm 41 to press the press roller cam (see FIG. (Not shown). The press roller cam is rotated by a press roller drive motor (not shown) independent of the main motor 60 drive section of the plate cylinder 1 in accordance with the feeding timing of the printing paper P from the registration roller pair 33a, 33b. It has become so.
  The operation of the peeling fan 68 or the peeling fan 165 in the stencil printing apparatus 200A can be easily inferred from the first embodiment and the like, and thus the description thereof is omitted.
[0115]
The characteristics of the cause of paper roll-up are not limited to the above-described various printing conditions, and for example, combinations of ink types (hard ink and soft ink) or the like are disclosed in Japanese Patent Laid-Open No. 9-193526. The air flow rate adjusting means is appropriately attached to the wind direction varying means of the present invention, and finer wind direction variable control and air volume adjustment are performed than in the first embodiment and the first and second modifications. Of course.
[0116]
  In Embodiment 1 and Modifications 1 and 2, both the paper width wind direction varying means 115 and the vertical wind direction varying means 130 are provided as the wind direction varying means. However, the present invention is not limited to this, and depending on the necessity and application, etc. Theat leastPaper width wind direction varying means 115(See claims 1 to 9).
[0117]
  Although the description will be omitted, since the stencil printing apparatuses 200 and 200A are so-called advanced types as compared with the conventional apparatus, the sheet width / wind direction varying means 115 and the up / down wind direction varying means 130 constituting the wind direction varying means are automatically provided. Although the configuration is such that the direction of the air flow is changed, if this is not desired, a manual mechanism may be obtained by removing each driving means from the paper width air direction varying means 115 and the vertical air direction varying means 130. Of course, this is possible (claim 1)., 2reference).
[0118]
  In the control device 150 according to the first embodiment, the control device 150A according to the first modification example, and the control device 150B according to the second modification example, the characteristic value detection unit group 100 (image) is provided to prevent paper roll-up under various printing conditions. Based on various output signals from the amount detection means 101, the printing speed detection sensor 62, the temperature sensor 103, the humidity sensor 104, the paper thickness detection sensor 105) and the paper type input key 95, the air blow A is printed in the paper transport direction X. Based on the function of controlling the duct drive motor 139 so as to hit a preset part of the paper P and the output signals from the paper size detection sensor group 82 and the paper size input key 84, the air blow A is printed in the paper width direction Y. The function of the control means for controlling the wind control plate drive motor 129 so as to hit a preset part of the paper P, and the paper clamper 21 of the impression cylinder 20 When the leading edge of the printing paper P is clamped and when the leading edge of the printing paper P moves away from the paper clamper 21, the duct drive is performed so that the air blow A hits a predetermined portion of the printing paper P in the paper transport direction X. Although it has a function of a control means for controlling the motor 139, it is not limited to this as long as it is not necessary to peel and discharge the printing paper P with high accuracy and fine grain. One of the above-described various sensors or one or more of the control functions may be provided based on an output signal from two or more sensors.3-8reference).
[0119]
  The present invention relates to Embodiment 1 and Modification 1, 2, Reference Example 1In addition to the single-sided printing method as described above, for example, it can be applied to a so-called double-sided simultaneous printing method as well as a two-cylinder printing device described in JP-A-9-193526. Any type of printing apparatus can be used as long as it is equipped with a printer.
[0120]
  Embodiment 1 and Modification 1, 2, Reference Example 1The operation of the peeling fan 68 or 165 is not limited to the above-described operation example. For example, when it is clear that the sheet winding is unlikely to occur, the operation of the peeling fan 68 or 165 is stopped. You may be made into an OFF state, without blowing. In order to make this possible, for example, a separation fan non-operation setting means such as a blower off key for stopping the operation of the separation fans 68 and 165 is provided on the operation panel, etc. The separation fans 68 and 165 are deactivated by pushing them back and forth.
  Further, when the air blowing off key is not provided, for example, in a printing condition in which paper winding is unlikely to occur, that is, when the air blowing from the peeling fan is unnecessary, the control means of the present invention is based on the printing condition. The separation fan 68 and 165 may be controlled to be automatically deactivated so that the control device does not blow.
  In this way, when blowing from the peeling fan is unnecessary, the blowing from the peeling fan is stopped, so that no operation sound or blowing sound is generated, and waste of energy can be eliminated.
[0121]
As described above, the present invention has been described with respect to specific embodiments including examples. However, the configuration of the present invention is not limited to the above-described embodiments and modifications, and is configured by appropriately combining them. It will be apparent to those skilled in the art that various embodiments and examples can be configured within the scope of the present invention according to the necessity and application thereof.
[0122]
【The invention's effect】
  As described above, according to the present invention, it is possible to provide a novel printing apparatus by solving the problems of the conventional apparatus as described above. The effects of each claim are as follows.
  According to invention of Claim 1,With the above configuration,Under printing conditions where paper roll-up is likely to occur, the print paper is securely peeled from the plate cylinder to prevent paper roll-up by blowing air to the optimum position between the plate cylinder and printing paper. As well asAir blowing means (for example, peeling fan)Energy savings can be achieved without increasing the operating noise and blowing noise.In addition, according to the size of the printing paper, it is possible to blow air uniformly in the paper width direction between the plate cylinder and the printing paper, so that the printing paper is uniformly peeled from the plate cylinder in the paper width direction. In addition, image density unevenness can be prevented.
[0123]
  According to invention of Claim 2,With paper width and wind direction variable meansIn addition to the effect of the invention according to claim 1, by providing the air direction varying means in the blower discharge portion of the peeling fan,With paper width and wind direction variable meansThe wind direction varying means can be reduced in size.
[0128]
  Claim3According to the described invention, the control means controls the drive means so that the air blows against a preset portion of the printing paper in the paper width direction based on the output signal from the characteristic value detection means, for example, manually. By the operation, it is automatically claimed without the trouble of changing the wind direction in the paper width direction.1 or 2The effects of the described invention are exhibited.
[0130]
  Claim4According to the described invention, the characteristic value detecting means comprises the image amount detecting means for detecting the image amount of the image printed on the printing paper, and the claim is made according to the amount of the image amount.3The effects of the described invention are exhibited.
[0131]
  Claim5According to the described invention, the characteristic value detection means comprises the rotation speed detection means for detecting the rotation speed of the plate cylinder, and according to the slow speed of the plate cylinder.3The effects of the described invention are exhibited.
[0132]
  Claim6According to the described invention, the characteristic value detection means includes the temperature detection means for detecting the temperature of at least one of the inside and the outside of the printing apparatus body, so that at least one of the inside and the outside of the printing apparatus body. Depending on the temperature of the claim3The effects of the described invention are exhibited.
[0133]
  Claim7According to the described invention, the characteristic value detection means comprises humidity detection means for detecting the humidity of at least one of the internal and external humidity of the printing apparatus main body, so that the humidity of the internal and external humidity of the printing apparatus main body is detected. Depending on the humidity level of at least one of the claims3The effects of the described invention are exhibited.
[0134]
  Claim8According to the described invention, the characteristic value detecting means comprises the thickness detecting means for detecting the thickness of the printing paper, and according to the thickness of the printing paper,3The effects of the described invention are exhibited.
[0136]
  Claim9According to the described invention, the control unit controls the driving unit so that the air blows against a preset portion of the printing paper in the paper width direction based on the output signal from the paper size detecting unit, for example, printing Depending on the size of the paper, a manual operation can automatically claim without the hassle of changing the wind direction in the paper width direction.1Or2The effects of the described invention are exhibited.
[Brief description of the drawings]
FIG. 1 is a perspective view of a stencil printing apparatus according to a first embodiment of the present invention around a peeling fan, a paper width air direction varying unit, and a vertical air direction varying unit.
FIG. 2 is a front view of the main part showing the vertical displacement operation of the movable duct of the separation fan in the first embodiment.
3A shows a blowing state when the movable duct of the separation fan in Embodiment 1 is displaced upward, and FIG. 3B shows a blowing state when the movable duct is displaced downward. It is a schematic front view.
FIGS. 4A and 4B show a blowing state when the movable duct of the separation fan in the first embodiment is displaced to the uppermost position, and FIG. 4B shows a blowing state when the movable duct is displaced to the lowest position, respectively. It is a schematic front view to represent.
FIG. 5 is a partial cross-sectional plan view showing a paper width air direction varying means and an opening / closing mechanism in Embodiment 1.
6 is a partial cross-sectional front view of the main part of FIG. 5;
7A is a diagram illustrating an operation state in which each wind control plate of the paper width wind direction varying unit according to the first exemplary embodiment moves in an opening direction according to a large paper size, and FIG. FIG. 6 is a schematic plan view illustrating an operation state moved in a closing direction according to a small size, and (c) is a chart illustrating an operation state in which a wind control plate is opened and closed according to a paper size.
FIG. 8 is a block diagram illustrating a main control configuration in the first embodiment.
FIG. 9 is a plan view of a main part of the operation panel according to the first embodiment.
FIG. 10 is a perspective view illustrating a disposition state of the paper size detection sensor group according to the first exemplary embodiment with a part thereof broken.
FIG. 11 is a schematic front view showing the relationship between the plate cylinder and the impression cylinder and the operation of the sheet clamper of the impression cylinder in the first embodiment.
FIG. 12 is a schematic front view showing the configuration of the stencil printing apparatus according to the first embodiment.
FIG. 13 is a flowchart showing a main operation sequence of the stencil printing apparatus according to the first embodiment.
14 is a block diagram illustrating a main control configuration in Modification 1 of Embodiment 1. FIG.
FIG. 15 is a plan view of a main part of an operation panel in a first modification of the first embodiment.
FIG. 16 is a block diagram illustrating a main control configuration in a second modification of the first embodiment.
FIG. 17 is a plan view of a main part of an operation panel in a second modification of the first embodiment.
FIG. 18 shows the first embodiment.Reference example 1FIG. 6 is a perspective view around the peeling fan and the up / down air direction changing means in FIG.
FIG. 19 shows the first embodiment.Reference example 1It is a partial cross section front view which shows the rocking | fluctuation operation | movement of the shutter of the peeling fan in.
FIG. 20 (a) shows the first embodiment.Reference example 1(B) is a schematic front view showing an operation state when the air blown downward due to the swing of the shutter of the peeling fan in FIG. is there.
FIG. 21 is a schematic front view showing a configuration of a stencil printing apparatus different from that of Embodiment 1 using a press roller.
[Explanation of symbols]
  1 plate cylinder
  2 Master
  20 impression cylinder
  21 Paper clamper as holding means
  62 Printing speed detection sensor as rotation speed detection means
  66 Peeling nail as a peeling member
  68,165 Peeling fan
  82 Paper size detection sensor group as paper size detection means
  100 characteristic value detection means group
  101 Image amount detection means
  103 Temperature Sensor as Temperature Detection Means
  104 Humidity sensor as humidity detection means
  105 Paper thickness detection sensor as thickness detection means
  115 Paper width wind direction variable means
  116a, 116b Wind control plate constituting sheet width wind direction varying means
  129 Wind control plate drive motor as drive means of paper width wind direction variable means
  130 Vertical wind direction variable means
  131 Movable duct constituting vertical wind direction variable means
  139 Duct drive motor as drive means of up-and-down air direction variable means
  150, 150A, 150B Control device as control means
  200,200A Stencil printing apparatus as an example of printing apparatus
  P Printing paper
  X Paper transport direction
  Y Paper width direction

Claims (9)

Ink is supplied from the inside of the plate cylinder around which the master is wound to the master on the plate cylinder, the printing paper is pressed against the master on the plate cylinder, and printing is performed on the printing paper. In a printing apparatus that blows air between paper and peels the printing paper from the plate cylinder,
Have a wind direction changing means for changing the direction of air blowing from the blowing peeling means,
The printing apparatus according to claim 1, wherein the wind direction varying means includes a sheet width wind direction varying means for changing the direction of the air blowing in the sheet width direction . Ink is supplied from the inside of the plate cylinder around which the master is wound to the master on the plate cylinder, the printing paper is pressed against the master on the plate cylinder, and printing is performed on the printing paper. In a printing apparatus that blows air between paper and peels the printing paper from the plate cylinder,
It has a wind direction varying means for changing the direction of blowing from the blowing separation means,
The blowing peeling means comprises peeling the fan, setting the air direction changing means to the blower discharge portion of該剥away fans,
The printing apparatus according to claim 1, wherein the wind direction varying means includes a sheet width wind direction varying means for changing the direction of the air blowing in the sheet width direction . The printing apparatus according to claim 1 or 2,
The paper width wind direction varying means includes a driving means for driving the paper width wind direction varying means,
Based on an output signal from the characteristic value detecting means, characteristic value detecting means for detecting the characteristic value of the paper roll-up factor that the printing paper remains attached to the plate cylinder without being peeled from the plate cylinder, And a control unit that controls the driving unit so that the blown air strikes a preset portion of the printing paper in the paper width direction . The printing apparatus according to claim 3 .
The characteristic of the paper roll-up factor is the image amount of the image printed on the printing paper,
The printing apparatus , wherein the characteristic value detection unit includes an image amount detection unit that detects an image amount of the image . The printing apparatus according to claim 3 .
The characteristic of the paper roll-up factor is the rotational speed of the plate cylinder,
The printing apparatus according to claim 1, wherein the characteristic value detection means includes rotation speed detection means for detecting the rotation speed . The printing apparatus according to claim 3.
The characteristic of the paper roll-up factor is the temperature of at least one of the internal and external temperatures of the printing apparatus main body,
The printing apparatus according to claim 1, wherein the characteristic value detection means comprises temperature detection means for detecting the at least one temperature . The printing apparatus according to claim 3 .
The property of the paper roll-up factor is the humidity of at least one of the internal and external humidity of the printing apparatus main body,
The printing apparatus according to claim 1, wherein the characteristic value detection means includes humidity detection means for detecting the at least one humidity . The printing apparatus according to claim 3 .
The characteristic of the paper roll-up factor is the thickness of the printing paper,
The printing apparatus according to claim 1, wherein the characteristic value detection means comprises thickness detection means for detecting the thickness . The printing apparatus according to claim 1 or 2 ,
The paper width wind direction varying means includes a driving means for driving the paper width wind direction varying means,
Based on a paper size detecting means for detecting the size of the printing paper and an output signal from the paper size detecting means, the driving means is controlled so that the air blows against a preset portion of the printing paper in the paper width direction. And a control unit .

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