JP2001130762A - Paper feeding and conveying device - Google Patents
Paper feeding and conveying deviceInfo
- Publication number
- JP2001130762A JP2001130762A JP31357499A JP31357499A JP2001130762A JP 2001130762 A JP2001130762 A JP 2001130762A JP 31357499 A JP31357499 A JP 31357499A JP 31357499 A JP31357499 A JP 31357499A JP 2001130762 A JP2001130762 A JP 2001130762A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- paper
- feeding
- conveying
- specific
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Registering Or Overturning Sheets (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、ファクシミリ装
置,プリンタ,複写機などに搭載されて用紙を所定位置
へ給紙搬送する給紙搬送装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder mounted on a facsimile machine, a printer, a copying machine, or the like, for feeding paper to a predetermined position.
【0002】[0002]
【従来の技術】図5は従来の用紙分離給紙装置の一例を
示す構成図であり、1は用紙Pが積載されて収納される
給紙カセット、2は給紙カセット1から用紙Pを1枚ず
つ分離給紙するため給紙ローラ4に接する分離パッド、
5は搬送ローラ対、6はレジストローラ対、7は電子写
真形成装置を構成する感光体、8は感光体7に形成され
たトナー像を用紙Pに転写する転写ローラ、9は、用紙
Pに転写したトナー像を挟持するようにして定着させる
熱定着ローラ10に接する加圧ローラ、11は定着後の
用紙Pを排紙するための排出ローラ対、12は搬送ロー
ラ対5とレジストローラ対6間に設置されて送られてく
る用紙Pの先端を検知する用紙端部検知センサ、13は
レジストローラ対6と感光体7間に設置されて用紙Pの
端部を検知するレジストセンサ、14は排出ローラ対1
1近傍に設置された用紙排出センサであって、15は用
紙搬送経路を示す。2. Description of the Related Art FIG. 5 is a block diagram showing an example of a conventional sheet separating and feeding apparatus. Reference numeral 1 denotes a sheet cassette in which sheets P are stacked and stored, and 2 denotes a sheet P from the sheet cassette 1. A separation pad that comes into contact with the paper feed roller 4 for separating and feeding paper one by one;
Reference numeral 5 denotes a pair of conveying rollers, reference numeral 6 denotes a pair of registration rollers, reference numeral 7 denotes a photoreceptor constituting an electrophotographic forming apparatus, reference numeral 8 denotes a transfer roller for transferring a toner image formed on the photoreceptor 7 onto a paper P, and reference numeral 9 denotes a paper P A pressure roller in contact with a heat fixing roller 10 for fixing the transferred toner image so as to sandwich the transferred toner image, 11 is a discharge roller pair for discharging the paper P after fixing, 12 is a transport roller pair 5 and a registration roller pair 6 A paper edge detection sensor that is installed between the pair of registration rollers 6 and the photoconductor 7 and detects the edge of the paper P, and a paper edge detection sensor 13 is provided between the registration roller pair 6 and the photoconductor 7 to detect the leading end of the paper P that is sent. Discharge roller pair 1
Reference numeral 15 denotes a sheet discharge sensor installed in the vicinity of 1, and reference numeral 15 denotes a sheet conveyance path.
【0003】図5において、給紙カセット1から分離パ
ッド2と給紙ローラ4とによって1枚ずつ分離給紙され
る用紙Pは、各センサ12,13,14の検知により制
御されながら、搬送ローラ対5,レジストローラ対6,
感光体7および転写ローラ8,加圧ローラ9および熱定
着ローラ10,排出ローラ対11における搬送力を受け
て、用紙搬送経路15を給紙搬送される。In FIG. 5, a sheet P separated and fed one by one from a sheet feeding cassette 1 by a separation pad 2 and a sheet feeding roller 4 is transported while being controlled by detection of sensors 12, 13 and 14. Pair 5, registration roller pair 6,
The sheet 7 is fed and conveyed along the sheet conveying path 15 by receiving the conveying force of the photoconductor 7, the transfer roller 8, the pressure roller 9, the heat fixing roller 10, and the discharge roller pair 11.
【0004】図6は前記構成の従来例における給紙動作
に係るフローチャートであり、給紙動作が開始されると
(S6−1のYES)、給紙ローラ4は、予め設定され
た給紙実施時間Tk秒の間、線速Hmm/secにて用紙を
送る(S6−2)。Tk秒経過後、用紙端部検知センサ
(以下、PESという)12が作動し、PES12が用
紙Pの先端を検知してオンすれば(S6−3のYE
S)、給紙再トライ回数nをリセットし(S6−4)、
用紙Pを所定のLpmm送る(S6−5)。FIG. 6 is a flowchart showing a sheet feeding operation in the conventional example having the above-described configuration. When the sheet feeding operation is started (YES in S6-1), the sheet feeding roller 4 starts a predetermined sheet feeding operation. The paper is fed at a linear speed of Hmm / sec for a time Tk seconds (S6-2). After a lapse of Tk seconds, the sheet edge detection sensor (hereinafter, referred to as PES) 12 operates, and if the PES 12 detects the leading edge of the sheet P and turns on (YE in S6-3).
S), the number n of sheet feeding retries is reset (S6-4),
The sheet P is fed by a predetermined Lpmm (S6-5).
【0005】レジストローラ対6は、線速S(S≪H)
mm/secにて用紙Pを送り(S6−6)、用紙Pを感光
体7と転写ローラ8との間のニップNへタイミングを取
って送り、ニップNにおける画像形成処理を可能にする
(S6−7)。給紙が続行して次頁がある場合(S6−
8のYES)、ステップ(S6−1)に戻る。しかし、
次頁がない場合(S6−8のNO)、給紙終了であって
(S6−9)、待機状態になる(S6−10)。The registration roller pair 6 has a linear velocity S (S≪H)
The paper P is fed at a speed of mm / sec (S6-6), and the paper P is fed to the nip N between the photosensitive member 7 and the transfer roller 8 at a certain timing to enable the image forming process in the nip N (S6). -7). When paper feeding continues and there is a next page (S6-
8 (YES), returning to step (S6-1). But,
If there is no next page (NO in S6-8), the sheet feeding has been completed (S6-9), and the apparatus enters a standby state (S6-10).
【0006】ここで、ステップ(S6−3)においてP
ES12がオンしなければ(S6−3のNO)、給紙再
トライ回数nに「1」を加算し(S6−11)、給紙再
トライ設定回数mの範囲内で給紙動作を繰り返すためス
テップ(S6−2)に戻る(S6−12のNO)。そし
て、給紙再トライ回数nが予め設定されている給紙再ト
ライ設定回数mを超えた場合(S6−12のYES)、
給紙再トライ不能として適当な表示手段によりジャムが
発生していることを表示し(S6−13)、他の制御を
終了して(S6−14)、待機状態になる(S6−1
0)。Here, in step (S6-3), P
If the ES 12 is not turned on (NO in S6-3), “1” is added to the number n of sheet retry attempts (S6-11), and the sheet feeding operation is repeated within the set number m of sheet retry attempts. The process returns to step (S6-2) (NO in S6-12). If the number n of sheet retry attempts exceeds the preset number m of sheet retry settings (YES in S6-12),
It is determined that the paper feeding cannot be retried, and the appropriate display means indicates that a jam has occurred (S6-13), and other controls are terminated (S6-14), and the apparatus enters a standby state (S6-1).
0).
【0007】前記従来例の給紙動作制御では、何らかの
原因により給紙が1回で行われない場合、給紙再トライ
を行っているが、この給紙再トライのときに必ずしも円
滑に給紙が行われるとは限らない。In the above-described conventional paper feeding operation control, if paper feeding is not performed at one time for some reason, paper feeding retry is performed. Is not always performed.
【0008】例えば特開平8−169632号公報に
は、給紙再トライ時における給紙搬送速度を上げるよう
にして、全体のプリント速度を低下させないようにした
構成の給紙装置が記載されている。For example, Japanese Patent Application Laid-Open No. 8-169632 describes a paper feeding device having a configuration in which the paper feeding speed at the time of retrying paper feeding is increased so as not to lower the overall printing speed. .
【0009】[0009]
【発明が解決しようとする課題】また、前記従来例にお
いて、1回目の給紙動作にて用紙PがPES12の検知
領域に達せず、PES12がオンしない場合には誤給紙
が発生したとして給紙再トライが行われることになる
が、図5に示すように、用紙Pの先端がPES12の近
傍まで送られている場合がある。In the prior art, if the paper P does not reach the detection area of the PES 12 in the first paper feeding operation and the PES 12 is not turned on, it is determined that erroneous paper feeding has occurred. Although the paper retry is performed, the leading end of the paper P may be fed to the vicinity of the PES 12 as shown in FIG.
【0010】ところで、PES12の動作タイミングが
給紙動作開始からTk秒後に設定されているため、図5
に示す用紙Pの先端の位置から2回目の給紙動作が開始
されると、その用紙Pの先端は、図7に示すように、レ
ジストローラ対6のニップを通過して搬送されるおそれ
がある。Incidentally, since the operation timing of the PES 12 is set after Tk seconds from the start of the sheet feeding operation, FIG.
When the second paper feeding operation is started from the position of the leading end of the sheet P shown in FIG. 7, the leading end of the sheet P may be conveyed through the nip of the registration roller pair 6 as shown in FIG. is there.
【0011】そして、通常、複数枚の用紙を用紙間隔を
できるだけ小さくするようにして給紙搬送を行うよう
に、レジストローラ対6の線速Smm/secよりも給紙ロ
ーラ4の線速Hmm/secの方が大きくなっているため、
給紙ローラ4による用紙送り量よりレジストローラ対6
の用紙送り量の方が小さいため、搬送方向上流側に前に
給紙搬送された用紙が存在する場合には、その用紙の後
端部に損傷を与えてしまうおそれがあり、また図7に示
すように、用紙搬送経路15において用紙Pが折れ曲が
ったり、ジャムを発生させることもある。Usually, the linear velocity of the paper feed roller 4 is set to be higher than the linear velocity Smm / sec of the pair of registration rollers 6 so that a plurality of sheets are fed and transported with the paper interval being as small as possible. Because sec is larger,
The registration roller pair 6 is determined based on the paper feed amount by the paper feed roller 4.
Since the paper feed amount is smaller, if there is a sheet that has been previously fed and conveyed upstream in the conveyance direction, there is a possibility that the rear end of the sheet may be damaged. As described above, the sheet P may be bent or jammed in the sheet transport path 15.
【0012】本発明の目的は、前記従来の問題を解決
し、1回の給紙動作によって搬送が行われない場合に給
紙の再トライを行う構成であって、その給紙再トライが
円滑に行われるようにした給紙搬送装置を提供すること
にある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problem, and to retry sheet feeding when conveyance is not performed by one sheet feeding operation. The present invention is to provide a sheet feeding and conveying device which is performed in the above manner.
【0013】[0013]
【課題を解決するための手段】前記目的を達成するた
め、本発明は、用紙を用紙積載部から1枚ずつ順次給紙
して所定の位置へ搬送し、用紙の搬送を用紙端部検知セ
ンサにより監視し、1回の給紙動作によって搬送が行わ
れない場合、給紙動作を再度行う構成の給紙搬送装置に
おいて、用紙先端を検知する用紙端部検知センサによる
監視動作を1回目の給紙搬送開始時から常時行わせ、用
紙端部検知センサから用紙搬送方向下流側における特定
の用紙搬送手段に対する用紙送り過ぎを防止するために
給紙搬送系の駆動制御を行う制御手段を備えたものであ
り、この構成によって、常時、用紙端部検知センサによ
り用紙の先端検知を行って、給紙搬送系の駆動制御を行
うため、特定の用紙搬送手段に対して用紙を送り過ぎて
ジャムを発生させたり、前に給紙されている用紙の後端
に損傷を与えるなどのトラブルの発生を回避することが
できる。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a sheet feeder which feeds sheets one by one from a sheet stacking section and conveys the sheets to a predetermined position. In the sheet feeding device configured to perform the sheet feeding operation again when the sheet is not conveyed by one sheet feeding operation, the monitoring operation by the sheet edge detection sensor for detecting the leading edge of the sheet is performed by the first sheet feeding operation. Control means for controlling the driving of the paper feed system in order to prevent the paper from being excessively fed to the specific paper transport means on the downstream side in the paper transport direction from the paper edge detection sensor from the paper edge detection sensor so that the paper transport is always performed from the start of the paper transport. With this configuration, the leading edge of the sheet is always detected by the sheet edge detection sensor, and the drive control of the sheet feeding and conveying system is performed. Was , It is possible to avoid the occurrence of troubles such as damaging the rear end of the sheet being fed to the front.
【0014】また本発明は、前記特定の用紙搬送手段の
用紙搬送方向上流側と、特定の用紙搬送手段を含む用紙
搬送方向下流側とにおいて異なる駆動手段により他の用
紙搬送手段を駆動し、特定の用紙搬送手段からは用紙を
所定のタイミングおよび搬送速度により搬送し、特定の
用紙搬送手段までは用紙を前記所定の搬送速度より高速
にて給紙搬送するように制御されている構成であって
も、前記のように、常時、用紙端部検知センサにより用
紙の先端検知を行って、給紙搬送系の駆動制御を行うた
め、給紙搬送系において搬送速度の違いにより、特定の
用紙搬送手段に対して用紙を送り過ぎてジャムを発生さ
せたり、前に給紙されている用紙の後端に損傷を与える
などのトラブルの発生を回避することができる。Further, according to the present invention, the other sheet conveying means is driven by different driving means on the upstream side in the sheet conveying direction of the specific sheet conveying means and on the downstream side in the sheet conveying direction including the specific sheet conveying means. The paper transport means is configured to transport the paper at a predetermined timing and a transport speed, and to a specific paper transport means so as to feed and transport the paper at a speed higher than the predetermined transport speed. Also, as described above, since the leading edge of the sheet is always detected by the sheet edge detecting sensor and the drive control of the sheet feeding and conveying system is performed, the specific sheet conveying means differs depending on the conveying speed in the sheet feeding and conveying system. It is possible to avoid occurrence of troubles such as causing a paper jam too much to cause a paper jam or damaging the rear end of a previously fed paper.
【0015】また本発明は、前記用紙端部検知センサに
より用紙の先端が検知された場合に、用紙搬送手段の搬
送速度を減速させて特定の用紙搬送手段への給紙タイミ
ングを調整するものである。Further, according to the present invention, when the leading edge of the paper is detected by the paper edge detecting sensor, the transport speed of the paper transport means is reduced to adjust the timing of paper feeding to a specific paper transport means. is there.
【0016】また本発明は、前記用紙端部検知センサに
より用紙の先端が検知された場合に、用紙搬送手段の搬
送速を一時停止させて特定の用紙搬送手段への給紙タイ
ミングを調整するものである。Further, according to the present invention, when the leading edge of the paper is detected by the paper edge detection sensor, the transport speed of the paper transport means is temporarily stopped to adjust the timing of paper feeding to a specific paper transport means. It is.
【0017】また本発明は、前記特定の用紙搬送手段が
電子写真記録装置を構成する感光体に対して所定のタイ
ミングで用紙を搬送するレジストローラであることを特
徴とする。Further, the present invention is characterized in that the specific sheet conveying means is a registration roller for conveying a sheet at a predetermined timing with respect to a photoreceptor constituting an electrophotographic recording apparatus.
【0018】また本発明は、前記用紙端部検知センサに
より、用紙の後端を検知可能にしたものであり、この構
成によって、特別に用紙後端検知用のセンサを設置する
必要がなくなり、設置スペースの簡素化とコストダウン
を図ることができる。Further, according to the present invention, the trailing edge of the sheet can be detected by the sheet edge detecting sensor. With this configuration, it is not necessary to provide a sensor for detecting the trailing edge of the sheet. Space can be simplified and costs can be reduced.
【0019】[0019]
【発明の実施の形態】以下、本発明の好適な実施形態に
ついて図面を参照しながら説明する。なお、以下の説明
において、図5〜図7にて説明した部材に対応する部材
には同一符号を付して詳しい説明は省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the following description, members corresponding to the members described in FIGS. 5 to 7 are denoted by the same reference numerals, and detailed description is omitted.
【0020】図1は本発明の実施形態を説明するための
用紙分離給紙装置の制御系を示すブロック図、図2は本
実施形態の概略構成図、図3は本実施形態における給紙
動作に係るフローチャート、図4は本実施形態における
給紙搬送系の駆動部材の動作タイミングチャートであ
る。本実施形態における基本的な構成は、図2に示すよ
うに、図5〜図7に示した構成と同様であるため、その
説明は省略する。FIG. 1 is a block diagram showing a control system of a sheet separating and feeding device for explaining an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the present embodiment, and FIG. 3 is a sheet feeding operation in the present embodiment. FIG. 4 is an operation timing chart of the driving member of the sheet feeding and conveying system in the present embodiment. As shown in FIG. 2, the basic configuration in the present embodiment is the same as the configuration shown in FIGS. 5 to 7, and a description thereof will be omitted.
【0021】図1において、20は装置の構成部材の動
作をコントロールする制御ユニット、21は電源、22
は装置本体に設けられて設定状態,動作状態などを表示
する表示部、23はコントロール情報,設定情報,状態
情報などが記録されるメモリ、24はデータバス、25
は感光体7,転写ローラ8などからなり用紙に対して画
像を形成する書込ユニット、26は駆動力の伝達を断続
する電磁クラッチ3を有する給紙ローラ4,搬送ローラ
対5を駆動する駆動モータ(給紙モータ)、27は給紙
モータ26のモータドライバ、28は特定の用紙搬送手
段としてのレジストローラ対6,感光体7,転写ローラ
8,加圧ローラ9,熱定着ローラ10,排出ローラ対1
1を駆動する駆動モータ(書込モータ)、29は書込モ
ータ28のモータドライバであって、用紙の先端および
後端を検知可能な構成のPES12,レジストセンサ1
3,用紙排出センサ14の検知データがデータバス24
を介して制御ユニット20へ送られる構成になってい
る。In FIG. 1, reference numeral 20 denotes a control unit for controlling the operation of the components of the apparatus;
Is a display unit provided on the main body of the apparatus for displaying setting status, operating status, etc., 23 is a memory for recording control information, setting information, status information, etc., 24 is a data bus, 25
Is a writing unit composed of a photoreceptor 7 and a transfer roller 8 for forming an image on a sheet; 26 is a paper feed roller 4 having an electromagnetic clutch 3 for intermittently transmitting a driving force; A motor (feeding motor); 27, a motor driver of a feeding motor 26; 28, a pair of registration rollers as a specific sheet conveying means 6, a photoconductor 7, a transfer roller 8, a pressure roller 9, a heat fixing roller 10, and a discharge Roller pair 1
1 is a drive motor (write motor) for driving the write sensor 1; 29 is a motor driver for the write motor 28;
3. The detection data of the paper discharge sensor 14 is
Through the control unit 20.
【0022】また本実施形態は、給紙モータ26によっ
て正常の分離動作時における給紙ローラ4と搬送ローラ
対5の線速が略Hmm/secとなり、書込モータ28によ
ってレジストローラ対6,感光体7,熱定着ローラ1
0,排出ローラ対11の線速が略S(S≪H)mm/sec
となるように構成してある。さらに用紙搬送経路15に
おける各ローラの線速は、用紙搬送方向下流側のローラ
よりも上流側のローラの方が微量速くなるように設定さ
れ、各ローラ間において給紙搬送される用紙が引っ張り
合わずに、用紙に微少のループが生成されるようにして
ある。In this embodiment, the linear speed of the paper feed roller 4 and the transport roller pair 5 during the normal separation operation by the paper feed motor 26 becomes approximately Hmm / sec. Body 7, heat fixing roller 1
0, the linear velocity of the discharge roller pair 11 is approximately S (S≪H) mm / sec
It is configured so that Further, the linear velocity of each roller in the paper transport path 15 is set so that the upstream roller is slightly faster than the downstream roller in the paper transport direction, and the paper fed and transported between the rollers is pulled. Instead, a very small loop is generated on the sheet.
【0023】本実施形態における給紙動作を図3のフロ
ーチャート,図4のタイミングチャートを参照して説明
する。The paper feeding operation in the present embodiment will be described with reference to the flowchart of FIG. 3 and the timing chart of FIG.
【0024】まずレジストローラ対6よりも用紙搬送方
向下流側のローラ類は、書込モータ28により駆動され
てウォーミングアップに入り、書込ユニット25が書込
可能状態になると給紙動作を開始する(S3−1のYE
S)。この給紙動作が開始されると、PES12が検知
可能状態にされ、また搬送ローラ対5よりも用紙搬送方
向上流側のローラは給紙モータ26によって駆動され、
給紙ローラ4に設けられている電磁クラッチ3がオンさ
れ、給紙ローラ4は駆動力伝達状態になっている。First, the rollers on the downstream side of the registration roller pair 6 in the paper transport direction are driven by the writing motor 28 to enter warm-up, and when the writing unit 25 is in a writable state, the paper feeding operation is started ( YE of S3-1
S). When the sheet feeding operation is started, the PES 12 is set in a detectable state, and a roller on the upstream side in the sheet conveying direction with respect to the conveying roller pair 5 is driven by the sheet feeding motor 26,
The electromagnetic clutch 3 provided on the paper feed roller 4 is turned on, and the paper feed roller 4 is in a driving force transmission state.
【0025】この状態において用紙はHmm/secで分離
/搬送され、正常時には用紙搬送距離とHmm/secとの
関係により設定されるPES12の所定の検知タイミン
グにて用紙の先端が検知されることになる。本実施形態
では、給紙開始後、PES12が動作して用紙先端を常
に検知しているため、前記所定の検知タイミング以外の
タイミングでも用紙先端が検知されても、その検知後に
設定された時間(用紙搬送量)だけ用紙Pが線速Hmm/
secで搬送される。In this state, the sheet is separated / conveyed at Hmm / sec. In a normal state, the leading edge of the sheet is detected at a predetermined detection timing of the PES 12 which is set based on the relation between the sheet conveyance distance and Hmm / sec. Become. In the present embodiment, since the PES 12 operates to always detect the leading edge of the sheet after the start of the sheet feeding, even if the leading edge of the sheet is detected at a timing other than the predetermined detection timing, a time set after the detection is set. Paper P is linear speed Hmm /
Conveyed in sec.
【0026】PES12が用紙Pの先端を検知してオン
すれば(S3−2のYES)、給紙再トライ回数nがリ
セットされ(S3−3)、用紙Pを所定のLpmm送る
(S3−4)。1回目の給紙であれば(S3−5のYE
S)、用紙先端がレジストローラ対6手前に達するタイ
ミングで、給紙ローラ4に設けられている電磁クラッチ
3がオフされる。したがって、用紙Pはレジストローラ
対6によって線速Smm/secに減速されて搬送される
(S3−6)、そして、用紙Pが感光体7と転写ローラ
8との間のニップNへタイミングを取って送られ、ニッ
プNにおける画像形成処理を可能にする(S3−7)。
ここで次頁がない場合(S3−8のNO)、給紙完了で
あって(S3−9)、待機状態になる(S3−10)。If the PES 12 detects the leading edge of the sheet P and turns it on (YES in S3-2), the number n of sheet feeding retries is reset (S3-3), and the sheet P is fed by a predetermined Lpmm (S3-4). ). If it is the first paper feed (YE in S3-5)
S) At the timing when the leading edge of the sheet reaches the position just before the pair of registration rollers 6, the electromagnetic clutch 3 provided on the sheet feeding roller 4 is turned off. Accordingly, the paper P is conveyed at a reduced linear velocity Smm / sec by the registration roller pair 6 (S3-6), and the paper P is timed to the nip N between the photosensitive member 7 and the transfer roller 8. To enable image forming processing in the nip N (S3-7).
Here, when there is no next page (NO in S3-8), the sheet feeding is completed (S3-9), and a standby state is set (S3-10).
【0027】PES12が用紙の後端を検知し、給紙が
続行されて次頁がある場合(S3−8のYES)、ステ
ップ(S3−1)に戻り、2枚目の用紙が分離/搬送さ
れ、PES12により2枚目の用紙の先端が検知される
と(S3−2のYES)、ステップ(S3−3),(S
3−4)により2枚目の用紙を所定の距離搬送し、2枚
目の用紙がレジストローラ対6手前に達するタイミング
で搬送ローラ対5を一時停止させ、前の用紙がレジスト
ローラ対6を通り抜けた後に、2枚目の用紙の搬送を開
始させる(S3−11)。この後は既述したステップを
繰り返す。If the PES 12 detects the trailing edge of the sheet and the sheet feeding is continued and there is a next page (YES in S3-8), the flow returns to step (S3-1) to separate / convey the second sheet. When the leading edge of the second sheet is detected by the PES 12 (YES in S3-2), the steps (S3-3) and (S3) are performed.
According to 3-4), the second sheet is transported by a predetermined distance, and the transport roller pair 5 is temporarily stopped at a timing when the second sheet reaches the position just before the registration roller pair 6, so that the previous sheet causes the registration roller pair 6 to move. After passing through, the conveyance of the second sheet is started (S3-11). Thereafter, the steps described above are repeated.
【0028】なお、ステップ(S3−11)において、
前の用紙がレジストローラ対6を通り抜けるまで搬送ロ
ーラ対5を低速にして、搬送速度を減速させるようにし
てもよい(図4参照)。In step (S3-11),
The conveying roller pair 5 may be set at a low speed until the previous sheet passes through the registration roller pair 6 to reduce the conveying speed (see FIG. 4).
【0029】ここで、PES12がオンしなければ(S
3−2のNO)、給紙ローラ4と搬送ローラ対5をHmm
/secで搬送動作させ(S3−12)、割込回数Cに
「1」を加算し(S3−13)、この割込回数Cが予め
設定された割込設定回数(ジャムまでの回数)Aを超え
ていなければ(S3−14のNO)、給紙再トライ回数
nに「1」を加算し(S3−15)、給紙再トライ設定
回数mの範囲内で給紙動作を繰り返すためステップ(S
3−2)に戻る(S3−16のNO)。Here, if the PES 12 is not turned on (S
3-2), the feed roller 4 and the transport roller pair 5 are
/ Sec is performed (S3-12), "1" is added to the number of interrupts C (S3-13), and the number of interrupts C is set to a preset number of interrupts (number of times until jam) A If it is not exceeded (NO in S3-14), "1" is added to the number n of sheet feeding retries (S3-15), and the sheet feeding operation is repeated within the set number m of sheet feeding retries. (S
Return to 3-2) (NO in S3-16).
【0030】そして、割込回数Cが割込設定回数Aを超
える場合(S3−14のYES)、あるいは、給紙再ト
ライ回数nが予め設定されている給紙再トライ設定回数
mを超えた場合(S3−16のYES)、給紙再トライ
不能として適当な表示手段によりジャムが発生している
ことを表示し(S3−17)、他の制御を終了して(S
3−18)、待機状態になる(S3−10)。If the number of interrupts C exceeds the set number of interrupts A (YES in S3-14), or the number n of sheet retry attempts exceeds the preset number m of sheet retry attempts set in advance. In this case (YES in S3-16), it is determined that the paper feeding cannot be retried, an appropriate display means indicates that the jam has occurred (S3-17), and the other controls are terminated (S3-16).
3-18), and enters a standby state (S3-10).
【0031】[0031]
【発明の効果】以上説明したように、本発明によれば、
常時、用紙端部検知センサにより用紙の先端検知を行っ
て、給紙搬送系の駆動制御を行うため、特定の用紙搬送
手段に対して用紙を送り過ぎてジャムを発生させたり、
前に給紙されている用紙の後端に損傷を与えるなどのト
ラブルの発生を回避することができ、用紙給紙搬送の信
頼性を向上させることができる。As described above, according to the present invention,
At all times, the leading edge of the sheet is detected by the sheet edge detection sensor to control the drive of the sheet feeding and transport system.
It is possible to avoid the occurrence of troubles such as damaging the trailing end of the previously fed sheet, and to improve the reliability of sheet feeding and conveyance.
【図1】本発明の実施形態を説明するための用紙分離給
紙装置の制御系を示すブロック図FIG. 1 is a block diagram showing a control system of a sheet separating and feeding device for describing an embodiment of the present invention.
【図2】本発明の実施形態の概略構成図FIG. 2 is a schematic configuration diagram of an embodiment of the present invention.
【図3】本発明の実施形態における給紙動作に係るフロ
ーチャートFIG. 3 is a flowchart illustrating a sheet feeding operation according to the embodiment of the present invention.
【図4】本発明の実施形態における給紙搬送系の駆動部
材の動作タイミングチャートFIG. 4 is an operation timing chart of a driving member of a sheet feeding and conveying system according to the embodiment of the present invention.
【図5】従来の用紙分離給紙装置の一例を示す構成図FIG. 5 is a configuration diagram illustrating an example of a conventional sheet separation and feeding device.
【図6】従来例における給紙動作に係るフローチャートFIG. 6 is a flowchart relating to a sheet feeding operation in a conventional example.
【図7】図5に示す従来例における問題点の説明図FIG. 7 is an explanatory diagram of a problem in the conventional example shown in FIG.
2 分離パッド 3 電磁クラッチ 4 給紙ローラ 5 搬送ローラ対 6 レジストローラ対 7 感光体 8 転写ローラ 9 加圧ローラ 10 熱定着ローラ 11 排出ローラ 12 用紙端部検知センサ 13 レジストセンサ 20 制御ユニット 26 給紙モータ 27,29 モータドライバ 28 書込モータ 2 Separation Pad 3 Electromagnetic Clutch 4 Feeding Roller 5 Conveying Roller Pair 6 Registration Roller Pair 7 Photoconductor 8 Transfer Roller 9 Pressing Roller 10 Heat Fixing Roller 11 Discharge Roller 12 Paper Edge Detection Sensor 13 Registration Sensor 20 Control Unit 26 Paper Feed Motor 27, 29 Motor driver 28 Write motor
Claims (6)
して所定の位置へ搬送し、用紙の搬送を用紙端部検知セ
ンサにより監視し、1回の給紙動作によって搬送が行わ
れない場合、給紙動作を再度行う構成の給紙搬送装置に
おいて、 用紙先端を検知する用紙端部検知センサによる監視動作
を1回目の給紙搬送開始時から常時行わせ、用紙端部検
知センサから用紙搬送方向下流側における特定の用紙搬
送手段に対する用紙送り過ぎを防止するために給紙搬送
系の駆動制御を行う制御手段を備えたことを特徴とする
給紙搬送装置。1. A sheet is sequentially fed one by one from a sheet stacking section and conveyed to a predetermined position. The conveyance of the sheet is monitored by a sheet end detection sensor, and the sheet is conveyed by one sheet feeding operation. If there is no paper feed operation, in the paper feeder that is configured to perform the paper feed operation again, the monitoring operation by the paper edge detection sensor that detects the leading edge of the paper is always performed from the start of the first paper feed, and the paper edge detection sensor A sheet feeder, comprising: a control unit that controls a drive of a sheet feeder system in order to prevent overfeeding of a specific sheet feeder on a downstream side in a sheet feed direction.
上流側と、特定の用紙搬送手段を含む用紙搬送方向下流
側とにおいて異なる駆動手段により他の用紙搬送手段を
駆動し、特定の用紙搬送手段からは用紙を所定のタイミ
ングおよび搬送速度により搬送し、特定の用紙搬送手段
までは用紙を前記所定の搬送速度より高速にて給紙搬送
するように設定されている構成であることを特徴とする
請求項1記載の給紙搬送装置。2. A method for driving a specific sheet conveying means by driving different sheet conveying means by means of different driving means on an upstream side in the sheet conveying direction of the specific sheet conveying means and on a downstream side in a sheet conveying direction including the specific sheet conveying means. The sheet is conveyed from the means at a predetermined timing and a conveying speed, and the sheet is conveyed to a specific sheet conveying means at a speed higher than the predetermined conveying speed. The sheet feeding and conveying device according to claim 1.
端が検知された場合に、用紙搬送手段の搬送速度を減速
させて特定の用紙搬送手段への給紙タイミングを調整す
ることを特徴とする請求項1または2記載の給紙搬送装
置。3. When the leading edge of the sheet is detected by the sheet edge detecting sensor, the sheet feeding timing to a specific sheet conveying unit is adjusted by reducing the conveying speed of the sheet conveying unit. The sheet feeder according to claim 1.
端が検知された場合に、用紙搬送手段の搬送速を一時停
止させて特定の用紙搬送手段への給紙タイミングを調整
することを特徴とする請求項1または2記載の給紙搬送
装置。4. The method according to claim 1, wherein when the leading edge of the sheet is detected by the sheet edge detection sensor, the feeding speed of the sheet feeding unit is temporarily stopped to adjust the timing of feeding the sheet to a specific sheet feeding unit. 3. The sheet feeding and conveying device according to claim 1, wherein
装置を構成する感光体に対して所定のタイミングで用紙
を搬送するレジストローラであることを特徴とする請求
項1,2,3,4のいずれか1項記載の給紙搬送装置。5. The apparatus according to claim 1, wherein said specific sheet conveying means is a registration roller which conveys a sheet at a predetermined timing to a photoconductor constituting an electrophotographic recording apparatus. The sheet feeding / conveying device according to any one of the above items.
後端を検知可能にしたことを特徴とする請求項1,3,
4のいずれか1項記載の給紙搬送装置。6. The sheet edge detecting sensor according to claim 1, wherein a trailing edge of the sheet can be detected.
5. The sheet feeding and conveying device according to any one of items 4 to 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31357499A JP3817099B2 (en) | 1999-11-04 | 1999-11-04 | Paper feed device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31357499A JP3817099B2 (en) | 1999-11-04 | 1999-11-04 | Paper feed device |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001130762A true JP2001130762A (en) | 2001-05-15 |
JP3817099B2 JP3817099B2 (en) | 2006-08-30 |
Family
ID=18042958
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JP31357499A Expired - Fee Related JP3817099B2 (en) | 1999-11-04 | 1999-11-04 | Paper feed device |
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JP (1) | JP3817099B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004017580A (en) * | 2002-06-19 | 2004-01-22 | Seiko Epson Corp | Printer |
JP2009040576A (en) * | 2007-08-10 | 2009-02-26 | Murata Mach Ltd | Paper sheet conveying device and paper sheet conveying method |
JP2017196788A (en) * | 2016-04-27 | 2017-11-02 | セイコーエプソン株式会社 | Printer |
JP2021046298A (en) * | 2019-09-19 | 2021-03-25 | 富士ゼロックス株式会社 | Medium carrier device and image formation device |
-
1999
- 1999-11-04 JP JP31357499A patent/JP3817099B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004017580A (en) * | 2002-06-19 | 2004-01-22 | Seiko Epson Corp | Printer |
JP2009040576A (en) * | 2007-08-10 | 2009-02-26 | Murata Mach Ltd | Paper sheet conveying device and paper sheet conveying method |
JP2017196788A (en) * | 2016-04-27 | 2017-11-02 | セイコーエプソン株式会社 | Printer |
JP2021046298A (en) * | 2019-09-19 | 2021-03-25 | 富士ゼロックス株式会社 | Medium carrier device and image formation device |
JP7408974B2 (en) | 2019-09-19 | 2024-01-09 | 富士フイルムビジネスイノベーション株式会社 | Media transport device and image forming device |
Also Published As
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JP3817099B2 (en) | 2006-08-30 |
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