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JP2013248070A - Sewing machine - Google Patents

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JP2013248070A
JP2013248070A JP2012123863A JP2012123863A JP2013248070A JP 2013248070 A JP2013248070 A JP 2013248070A JP 2012123863 A JP2012123863 A JP 2012123863A JP 2012123863 A JP2012123863 A JP 2012123863A JP 2013248070 A JP2013248070 A JP 2013248070A
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feed
pitch
sewing
needle
cloth
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JP5925603B2 (en
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Shinjiro Kadowaki
真次郎 門脇
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Juki Corp
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Abstract

PROBLEM TO BE SOLVED: To reduce the residual end length of a sewing thread after being cut in a sewing machine which performs needle feed.SOLUTION: In a sewing machine 1 which performs cloth feed by a feed dog 44 with a sewing needle 13 moved down and stuck through a workpiece cloth C, a controller 90 controls a feed amount adjustment mechanism such that, while the sewing needle 13 which forms a stitch TL of a final node point is stuck through the workpiece cloth, a feed pitch is set to a minimum pitch Pco capable of being adjusted by the feed amount adjustment mechanism in the normal or reverse cloth feed direction, and the workpiece cloth is fed at the set feed pitch. In addition, the controller 90 controls the feed amount adjustment mechanism such that, while the sewing needle which has been located at a point following the final node point is stuck through the workpiece cloth, a feed pitch is set to a maximum pitch Pmax capable of being adjusted by the feed amount adjustment mechanism in the normal feed direction, and the workpiece cloth is fed at the set feed pitch. During a period of time until a thread is cut after the feed dog which has fed the workpiece cloth at the maximum pitch is separated from the workpiece cloth, the controller 90 controls the feed amount adjustment mechanism such that a feed pitch is set to a maximum pitch capable of being adjusted by the feed amount adjustment mechanism in the reverse cloth feed direction, and the feed dog is moved at the set feed pitch.

Description

本発明は、糸切り後の残端を短くするミシンに関する。   The present invention relates to a sewing machine that shortens the remaining end after thread trimming.

従来のミシンは、針板の下側に送り歯を備え、送り歯のさらに下側に上糸及び下糸を切断するための糸切り装置が設けられている。
また、送り歯は送り方向に長径を沿わせた略長円の軌跡を描いて周回運動を行い、長円の上部を通過する際に針板の上面から送り歯の上端部が突出し、布地を所定の送り方向に送ることを可能としていた。
また、送り歯に上記周回運動を付与する送り機構は、その周回方向や周回運動を行う軌跡における送り方向の幅をアクチュエーターにより任意に調節可能であり、縫製動作の際に、制御装置の制御により、送りピッチを任意に変更したり、送り方向の正逆を切り換えることが可能であった。
The conventional sewing machine includes a feed dog on the lower side of the needle plate, and a thread trimming device for cutting the upper thread and the lower thread is further provided on the lower side of the feed dog.
In addition, the feed dog draws a substantially elliptical trajectory along the major axis in the feed direction and makes a circular motion.When passing through the upper part of the ellipse, the upper end of the feed dog protrudes from the upper surface of the needle plate, It was possible to send in a predetermined feed direction.
In addition, the feed mechanism that imparts the orbiting motion to the feed dog can adjust the feed direction and the width of the feed direction in the trajectory of the orbiting motion by an actuator, and can be controlled by the control device during the sewing operation. The feed pitch can be arbitrarily changed, and the forward / reverse feed direction can be switched.

ところで、ミシンにおいて、縫製の終了時には、糸切り装置によって自動的に上糸及び下糸の切断が行われるが、切断後の縫い目の終端における上糸及び下糸の残端が長いと、縫い品質が損なわれることから、これらの残端を短くすることは、自動位置切りを行うミシンにおける従来から重要課題であった。   By the way, in the sewing machine, when the sewing is finished, the upper thread and the lower thread are automatically cut by the thread trimming device. However, if the remaining ends of the upper thread and the lower thread at the end of the seam after the cutting are long, the sewing quality Therefore, shortening these remaining ends has been an important issue for sewing machines that perform automatic positioning.

このため、特許文献1に記載の先行技術では、上糸と下糸が絡み合って最終の結節を形成する針落ち(最終結節点)の後に送りピッチを極力短くして針落ちを行い、当該針落ちの際に捕捉された上糸及び下糸を切断することが提案されている。このミシンでは、縫い針のほぼ真下に糸の切断位置が来るように糸切り装置が配置されているため、最終結節点から極力糸切断位置が近接するようにして上糸及び下糸の残端長さを短くしている。   For this reason, in the prior art described in Patent Document 1, the needle drop is performed by shortening the feed pitch as much as possible after the needle drop (final knot point) in which the upper thread and the lower thread are intertwined to form the final knot. It has been proposed to cut the upper and lower threads that have been captured during the fall. In this sewing machine, since the thread trimming device is arranged so that the thread cutting position is almost directly below the sewing needle, the remaining ends of the upper thread and the lower thread are arranged so that the thread cutting position is as close as possible from the final knot. The length is shortened.

また、特許文献2に記載の先行技術では、針送りミシンの場合は縫い針のほぼ真下に糸の切断位置が来るように糸切り装置を配置することができないという事情に鑑みて、最終針で送り歯が針板上の布地から離れている状態で縫いピッチの3/4だけ逆転移動させ、切断部に送り歯の針穴を近づけることにより残り長さを短くすることで切断後の残端を短くすることを可能としている。   Further, in the prior art described in Patent Document 2, in the case of the needle feed sewing machine, in view of the fact that the thread trimming device cannot be arranged so that the thread cutting position comes almost directly below the sewing needle, Remaining edge after cutting by shortening the remaining length by moving the feed dog backward by 3/4 of the sewing pitch while moving the feed dog away from the cloth on the needle plate and bringing the needle hole of the feed dog closer to the cutting part Can be shortened.

また、特許文献3に記載の先行技術には、糸切り装置が引っ掛け用のナイフと切断用ナイフとを備え、これら双方が移動して切断を行うミシンが開示されている。このミシンの糸切り装置を針送りミシンに適用すれば、針振りの中心で糸切りを行うことができ、残端を短くすることが可能である。   Further, the prior art described in Patent Document 3 discloses a sewing machine in which a thread trimming device includes a hooking knife and a cutting knife, and both of them move to perform cutting. When this thread trimming device of a sewing machine is applied to a needle feed sewing machine, thread trimming can be performed at the center of needle swing, and the remaining end can be shortened.

特開平04−024092号公報Japanese Patent Laid-Open No. 04-024092 特許第4020692号公報Japanese Patent No. 4020692 特許第4164157号公報Japanese Patent No. 4164157

特許文献1に記載の糸切り装置は、針棒が揺動を行わず、一定の針落ち位置に針落ちが行われるミシンを対象とする発明であり、針棒が揺動を行うミシンに適用する場合には、縫い針との干渉を避けるために固定メスを針落ち位置から縫いピッチの最大設定幅×1/2よりも離れた位置に配置せざるを得ない。このため、最終結節点の後に送りピッチを極力短くして針落ちを行っても縫い糸の残端を短くすることができなかった。   The thread trimming device described in Patent Document 1 is an invention that is directed to a sewing machine in which the needle bar does not swing and the needle bar is moved at a fixed needle drop position, and is applied to a sewing machine in which the needle bar swings. In order to avoid interference with the sewing needle, the fixed knife must be arranged at a position away from the needle drop position by more than the maximum setting width × 1/2 of the sewing pitch. For this reason, even if the feed pitch is shortened as much as possible after the final knot and needle dropping is performed, the remaining end of the sewing thread cannot be shortened.

特許文献2に記載の糸切り装置は、針送りを考慮した設計となっているが、送り歯を縫いピッチの3/4だけ逆転移動させることにより切断部に送り歯の針穴を近接させることを必須とするので、切断部に対する送り歯の近接幅は、送りピッチの設定幅に依存し、設定ピッチが小さいと十分に送り歯を近接させることができず、縫い糸の残端を短くすることができなかった。   The thread trimming device described in Patent Document 2 is designed in consideration of needle feed, but by moving the feed dog reversely by 3/4 of the sewing pitch, the needle hole of the feed dog is brought close to the cutting portion. Therefore, the proximity width of the feed dog to the cutting part depends on the set width of the feed pitch. If the set pitch is small, the feed dog cannot be brought close enough and the remaining end of the sewing thread must be shortened. I could not.

特許文献3に記載の糸切り装置は、糸切り装置の引っかけ用のナイフと切断用ナイフの双方を移動させる構成が必要となり、構成の複雑化と部品点数の増加を招く問題があった。   The yarn trimming device described in Patent Document 3 requires a configuration for moving both the hooking knife and the cutting knife of the yarn trimming device, and there is a problem in that the configuration is complicated and the number of parts is increased.

本発明は、構造の複雑化、部品点数の増加を生じることなく縫い糸の残端を短くすることをその目的とする。   An object of the present invention is to shorten the remaining end of the sewing thread without causing a complicated structure and an increase in the number of parts.

請求項1記載の発明は、ミシンモーターにより回転駆動される上軸と、前記上軸の回転に同期して針棒を上下動させる針棒上下動機構と、前記上軸の回転に同期して布送り方向に沿って前記針棒を揺動させる針送り機構と、前記上軸の回転に同期して、針穴が形成された送り歯を前記布送り方向に沿った長円の軌跡で周回させて被縫製物を送る布送り機構と、前記針棒に支持された縫い針よりも正の布送り方向下流側で上糸及び下糸の切断を行う糸切り装置と、縫いピッチを調節する送り量調節機構と、前記糸切り装置と前記送り量調節機構の動作制御を行う制御装置とを備え、前記縫い針が下降して被縫製物に突き通された状態で前記送り歯による布送りを行うミシンにおいて、
前記制御装置は、最終結節点の縫い目を形成する縫い針が被縫製物に刺さっている状態で送りピッチを正又は逆の布送り方向に前記送り量調節機構により調節可能な最小ピッチとして前記被縫製物の送りを行い、さらに、前記最終結節点の次の針落ちを行った縫い針が被縫製物に刺さっている状態で送りピッチを正の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記被縫製物の送りを行い、前記最大ピッチで送りを行った前記送り歯が前記被縫製物から離れてから糸切りを行うまでの間、送りピッチを逆の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記送り歯を移動させるように、前記送り量調節機構を制御することを特徴とする。
According to the first aspect of the present invention, an upper shaft that is rotationally driven by a sewing machine motor, a needle bar vertical movement mechanism that moves the needle bar up and down in synchronization with the rotation of the upper shaft, and in synchronization with the rotation of the upper shaft. A needle feed mechanism that swings the needle bar along the cloth feed direction, and a feed dog with a needle hole that circulates in an elliptical locus along the cloth feed direction in synchronization with the rotation of the upper shaft. The cloth feed mechanism that feeds the workpiece to be sewn, the thread trimming device that cuts the upper thread and the lower thread on the downstream side in the positive cloth feed direction with respect to the sewing needle supported by the needle bar, and the sewing pitch is adjusted. A feed amount adjusting mechanism; and a control device for controlling the operation of the thread trimming device and the feed amount adjusting mechanism, and the cloth feed by the feed dog in a state in which the sewing needle is lowered and pierced through the workpiece. In the sewing machine that performs
The control device sets the feed pitch as the minimum pitch that can be adjusted by the feed amount adjusting mechanism in the forward or reverse cloth feed direction in a state where the sewing needle forming the seam of the final knot is stuck in the workpiece. The feed pitch can be adjusted by the feed amount adjustment mechanism in the positive cloth feed direction with the sewing needle fed after the last knot and the sewing needle stuck in the work piece. The sewing product is fed as a maximum pitch, and the feed pitch that is fed at the maximum pitch is set in the reverse cloth feeding direction until the feed dog is separated from the sewing product and before thread trimming is performed. The feed amount adjusting mechanism is controlled so as to move the feed dog as a maximum pitch adjustable by the feed amount adjusting mechanism.

請求項2記載の発明は、ミシンモーターにより回転駆動される上軸と、前記上軸の回転に同期して針棒を上下動させる針棒上下動機構と、前記上軸の回転に同期して布送り方向に沿って前記針棒を揺動させる針送り機構と、前記上軸の回転に同期して、針穴が形成された送り歯を前記布送り方向に沿った長円の軌跡で周回させて被縫製物を送る布送り機構と、前記針棒に支持された縫い針よりも正の布送り方向上流側で上糸及び下糸の切断を行う糸切り装置と、縫いピッチを調節する送り量調節機構と、前記糸切り装置と前記送り量調節機構の動作制御を行う制御装置とを備え、前記縫い針が下降して被縫製物に突き通された状態で前記送り歯による布送りを行うミシンにおいて、
前記制御装置は、最終結節点の縫い目を形成する縫い針が被縫製物に刺さっている状態で送りピッチを正又は逆の布送り方向に前記送り量調節機構により調節可能な最小ピッチとして前記被縫製物の送りを行い、さらに、前記最終結節点の次の針落ちを行った縫い針が被縫製物に刺さっている状態で送りピッチを逆の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記被縫製物の送りを行い、前記最大ピッチで送りを行った前記送り歯が前記被縫製物から離れてから糸切りを行うまでの間、送りピッチを正の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記送り歯を移動させるように、前記送り量調節機構を制御することを特徴とする。
According to a second aspect of the present invention, there is provided an upper shaft that is rotationally driven by a sewing machine motor, a needle bar vertical movement mechanism that moves the needle bar up and down in synchronization with the rotation of the upper shaft, and in synchronization with the rotation of the upper shaft. A needle feed mechanism that swings the needle bar along the cloth feed direction, and a feed dog with a needle hole that circulates in an elliptical locus along the cloth feed direction in synchronization with the rotation of the upper shaft. A cloth feed mechanism that feeds the work to be sewn, a thread trimming device that cuts the upper thread and lower thread upstream of the sewing needle supported by the needle bar in the positive cloth feed direction, and a sewing pitch is adjusted. A feed amount adjusting mechanism; and a control device for controlling the operation of the thread trimming device and the feed amount adjusting mechanism, and the cloth feed by the feed dog in a state in which the sewing needle is lowered and pierced through the workpiece. In the sewing machine that performs
The control device sets the feed pitch as the minimum pitch that can be adjusted by the feed amount adjusting mechanism in the forward or reverse cloth feed direction in a state where the sewing needle forming the seam of the final knot is stuck in the workpiece. The feed pitch can be adjusted by the feed amount adjustment mechanism in the reverse cloth feed direction with the sewing needle fed after the last knot point being stuck in the work piece while feeding the sewing product. The sewing product is fed as a maximum pitch, and the feed pitch that is fed at the maximum pitch is separated from the sewing product until thread trimming is performed. The feed amount adjusting mechanism is controlled so as to move the feed dog as a maximum pitch adjustable by the feed amount adjusting mechanism.

請求項1の発明は、正の布送り方向下流側で糸切りが行われる場合に、最終結節点の縫い目を形成する縫い針が被縫製物に刺さっている状態で送りピッチを正又は逆の布送り方向に送り量調節機構により調節可能な最小ピッチとして被縫製物の送りを行う。かかる最小ピッチは、例えば、制御装置において送り量調節機構による通常の縫製のピッチ幅の下限値から上限値までの範囲を予め定めている場合にはその下限値を「送り量調節機構により調節可能な最小ピッチ」としても良いが、通常の縫製以外の特殊な縫製、例えば、縫い始めや縫い終わりに縫い糸のほつれを防止するための微小ピッチでの縫いであるコンデンス縫い等の機能をミシンが有する場合であって、当該コンデンス縫いのピッチ幅が通常の縫製のピッチ幅の下限値よりも小さい値である場合には、このコンデンス縫いのピッチを「送り量調節機構により調節可能な最小ピッチ」としても良い。また、コンデンス縫いを行わないミシンの場合でも、通常の縫製のピッチ幅の下限値から上限値までの範囲から逸脱した通常の縫製では形成されないような微小なピッチを「送り量調節機構により調節可能な最小ピッチ」として通常の縫製のピッチ幅とは別に定めておいても良い。いずれにしても、これら「最小ピッチ」については0以外であることが要求される。
上記のように、最終結節点までは通常の送りピッチで縫い目が形成され、その次の運針では送り量調節機構により調節可能な最小ピッチで布送りが行われる。そして、その次の針落ちが行われているときの送りピッチは正方向に送り量調節機構により調節可能な最大ピッチとされるので、当該針落ち位置を最大限に糸切り位置側に移動させることができる。
さらに、送り歯は、被縫製物から離れると糸切り位置から離れる方向に移動を開始するが、この時に逆の布送り方向に送り量調節機構により調節可能な最大ピッチとなるように制御されるので、送り歯は再び糸切り位置に向かって移動を行い、糸切りの実行までに送り歯を最大限に糸切り位置側に移動させることができる。
これらにより、最小ピッチの針落ち位置から送り歯の針穴を介して糸切り位置までに至る経路長を最大限に縮めることができ、針振りを可能としつつ、糸切断後の残端を従来よりも短くすることが可能となる。
また、縫製中の縫いピッチに拘わらず、糸切断後の残端を従来よりも短くすることが可能である。
According to the first aspect of the present invention, when thread trimming is performed on the downstream side in the positive cloth feed direction, the feed pitch is set forward or reverse with the sewing needle forming the seam of the final knotting point stuck in the workpiece. The sewing material is fed as the minimum pitch that can be adjusted by the feed amount adjusting mechanism in the cloth feeding direction. For example, if the range from the lower limit value to the upper limit value of the normal sewing pitch width by the feed amount adjusting mechanism is predetermined in the control device, the lower limit value can be adjusted by the “feed amount adjusting mechanism”. The sewing machine has functions such as special sewing other than normal sewing, such as condensation sewing, which is sewing at a minute pitch to prevent fraying of the sewing thread at the beginning and end of sewing. If the pitch width of the condensation sewing is smaller than the lower limit value of the normal sewing pitch width, the condensation sewing pitch is set as the “minimum pitch adjustable by the feed amount adjusting mechanism”. Also good. In addition, even with a sewing machine that does not perform condensation sewing, a fine pitch that cannot be formed by normal sewing that deviates from the range from the lower limit value to the upper limit value of the normal sewing pitch width can be adjusted with the `` feed amount adjustment mechanism ''. The “minimum pitch” may be determined separately from the normal sewing pitch width. In any case, these “minimum pitches” are required to be other than zero.
As described above, the seam is formed at the normal feed pitch up to the final knot point, and the next stitch is fed at the minimum pitch adjustable by the feed amount adjusting mechanism. The feed pitch when the next needle drop is performed is the maximum pitch that can be adjusted in the forward direction by the feed amount adjustment mechanism, so that the needle drop position is moved to the thread trimming position side to the maximum. be able to.
Furthermore, the feed dog starts to move away from the thread trimming position when it is separated from the workpiece, but at this time, the feed dog is controlled to have a maximum pitch that can be adjusted by the feed amount adjusting mechanism in the reverse cloth feed direction. Therefore, the feed dog moves again toward the thread trimming position, and the feed dog can be moved to the thread trimming position side to the maximum extent before the thread trimming is executed.
As a result, the path length from the needle drop position of the minimum pitch to the thread trimming position through the needle hole of the feed dog can be shortened to the maximum, and the remaining end after thread cutting is made possible while allowing needle swinging. Can be made shorter.
In addition, the remaining end after thread cutting can be made shorter than before, regardless of the sewing pitch during sewing.

請求項2の発明は、正の布送り方向上流側で糸切りが行われる場合に、最終結節点の縫い目を形成する縫い針が被縫製物に刺さっている状態で送りピッチを正又は逆の布送り方向に送り量調節機構により調節可能な最小ピッチとして被縫製物の送りを行う。なお、「最小ピッチ」の例としては請求項1の場合と同様である。
そして、その次の針落ちが行われているときには逆方向に送り量調節機構により調節可能な最大ピッチとされ、送り歯が被縫製物から離れると正の布送り方向に送り量調節機構により調節可能な最大ピッチとなるように制御される。
これらにより、被縫製物の最小ピッチでの針落ち位置と送り歯とを最大限に糸切り位置に寄せることができ、最小ピッチの針落ち位置から送り歯の針穴を介して糸切り位置までに至る経路長を最大限に縮めることができる。従って、針振りを可能としつつ、糸切断後の残端を従来よりも短くすることが可能となる。
また、縫製中の縫いピッチに拘わらず、糸切断後の残端を従来よりも短くすることが可能である。
In the invention of claim 2, when thread trimming is performed on the upstream side in the positive cloth feed direction, the feed pitch is set to be normal or reverse in a state where the sewing needle forming the stitch of the final knot is stuck in the workpiece. The sewing material is fed as the minimum pitch that can be adjusted by the feed amount adjusting mechanism in the cloth feeding direction. An example of “minimum pitch” is the same as in the case of claim 1.
When the next needle drop is performed, the maximum pitch is adjusted by the feed amount adjusting mechanism in the reverse direction, and when the feed dog is separated from the workpiece, it is adjusted by the feed amount adjusting mechanism in the positive cloth feeding direction. It is controlled to be the maximum possible pitch.
As a result, the needle entry position and feed dog at the minimum pitch of the workpiece can be moved to the thread trimming position as much as possible, and from the needle entry position at the minimum pitch to the thread trimming position via the needle hole of the feed dog. Can be shortened to the maximum. Accordingly, it is possible to make the remaining end after the yarn cutting shorter than before while enabling the needle swing.
In addition, the remaining end after thread cutting can be made shorter than before, regardless of the sewing pitch during sewing.

第一の実施形態たる針送りミシンの機構線図である。It is a mechanism diagram of the needle feed sewing machine which is the first embodiment. 布送り機構の分解斜視図である。It is a disassembled perspective view of a cloth feed mechanism. 送り量変換体を示す側面図である。It is a side view which shows a feed amount conversion body. 水平送り機構の構成を示す概略説明図である。It is a schematic explanatory drawing which shows the structure of a horizontal feed mechanism. 送り量変換体と送り調節モータとの関係を表す分解斜視図である。It is a disassembled perspective view showing the relationship between a feed amount conversion body and a feed adjustment motor. 糸切り装置の斜視図である。It is a perspective view of a thread trimming device. ミシンの制御系を示すブロック図である。It is a block diagram which shows the control system of a sewing machine. ミシンの縫製時及び糸切り実行時のフローチャートである。It is a flowchart at the time of sewing of the sewing machine and execution of thread trimming. ミシンの糸切り実行時の動作説明図であり、図9(A)〜図9(E)の順に動作が進行する場合示している。It is operation | movement explanatory drawing at the time of the thread trimming of a sewing machine, and has shown the case where operation | movement advances in order of FIG. 9 (A)-FIG. 9 (E). 図9の続きのミシンの糸切り実行時の動作説明図であり、図10(F)〜図10(J)の順に動作が進行する場合示している。FIG. 10 is an operation explanatory diagram when executing thread trimming of the sewing machine continued from FIG. 9, and shows a case where the operation proceeds in the order of FIG. 10 (F) to FIG. 10 (J). 送り歯の位置変化を示す説明図である。It is explanatory drawing which shows the position change of a feed dog. ミシンの糸切り実行時の他の動作例を示す動作説明図であり、図12(A)〜図12(E)の順に動作が進行する場合示している。It is operation | movement explanatory drawing which shows the other operation example at the time of thread trimming of a sewing machine, and shows the case where operation | movement advances in order of FIG. 12 (A)-FIG.12 (E). 図12の続きのミシンの糸切り実行時の動作説明図であり、図13(F)〜図13(J)の順に動作が進行する場合示している。FIG. 13 is an operation explanatory view when the thread is trimmed from the sewing machine continued from FIG. 12, and shows a case where the operation proceeds in the order of FIG. 13 (F) to FIG. 13 (J). ミシンの糸切り実行時の他の動作例における送り歯の位置変化を示す説明図である。It is explanatory drawing which shows the position change of the feed dog in the other operation example at the time of thread trimming of a sewing machine. 第二の実施形態におけるミシンの糸切り実行時の動作説明図であり、図15(A)〜図15(E)の順に動作が進行する場合示している。It is operation | movement explanatory drawing at the time of the thread trimming execution of the sewing machine in 2nd embodiment, and shows the case where operation | movement advances in order of FIG. 15 (A)-FIG. 15 (E). 図15の続きのミシンの糸切り実行時の動作説明図であり、図16(F)〜図16(J)の順に動作が進行する場合示している。FIG. 16 is an operation explanatory diagram when executing thread trimming of the sewing machine continued from FIG. 15, and shows a case where the operation proceeds in the order of FIG. 16 (F) to FIG. 16 (J). 第二の実施形態におけるミシンの送り歯の位置変化を示す説明図である。It is explanatory drawing which shows the position change of the feed dog of the sewing machine in 2nd embodiment. 他の送り調節機構の機構線図である。It is a mechanism diagram of another feed adjustment mechanism. 他の送り調節機構の設定縫いピッチとする動作説明図である。It is operation | movement explanatory drawing made into the setting sewing pitch of another feed adjustment mechanism. 他の送り調節機構の逆送りの最大縫いピッチとする動作説明図である。It is operation | movement explanatory drawing made into the maximum sewing pitch of the reverse feed of another feed adjustment mechanism. 他の送り調節機構のコンデンス縫いピッチとする動作説明図である。It is operation | movement explanatory drawing made into the condensation sewing pitch of another feed adjustment mechanism. 他の送り調節機構の正送りの最大縫いピッチとする動作説明図である。It is operation | movement explanatory drawing made into the maximum sewing pitch of the forward feed of another feed adjustment mechanism.

[第一実施形態]
以下、本発明の第一の実施の形態を図1から図11に基づき詳しく説明する。本実施形態では、ミシンの送り機構として針送りミシンを例に説明する。針送りミシンは、例えば、厚物のように、通常の送り機構では滑りなどが生じて正確に設定ピッチ通りの送りが困難な被縫製物に対して、送り歯と同期して針棒の針振りを行い、縫い針を被縫製物に突き通した状態で設定ピッチ通りの送りを行うことが可能なミシンである。
ここで、以下の説明において、送り方向(矢印F)に沿う方向をX軸方向(前後方向)、X軸方向と直交するミシンアーム8の長手方向をY軸方向(左右方向)、X軸方向とY軸方向の両方に直交する方向をZ軸方向(上下方向)と定義する。
[First embodiment]
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. In this embodiment, a needle feed sewing machine will be described as an example of the feed mechanism of the sewing machine. The needle feed sewing machine is a needle bar needle that synchronizes with the feed dog, for example, for a workpiece that is difficult to feed precisely according to the set pitch due to slippage or the like caused by a normal feed mechanism, such as a thick material. The sewing machine is capable of swinging and feeding at a set pitch in a state where the sewing needle penetrates the workpiece.
Here, in the following description, the direction along the feed direction (arrow F) is the X-axis direction (front-rear direction), the longitudinal direction of the sewing machine arm 8 orthogonal to the X-axis direction is the Y-axis direction (left-right direction), and the X-axis direction. A direction perpendicular to both the Y-axis direction and the Y-axis direction is defined as a Z-axis direction (vertical direction).

[実施形態の全体構成]
図1は針送りミシン1の機構線図である。図1に示すように、針送りミシン1(以下、単にミシン1とする)は、ミシンフレーム2と、ミシンフレーム2内に回転可能に支持された主軸としての上軸9と、この上軸9に回転力を付与する回転駆動源たるミシンモーター60と、ミシンモーター60の駆動により針棒13を上下に駆動するとともに縫製方向Fに沿って揺動させる針送り機構14と、偏心カム61を原節として従動することで針送り機構14に往復揺動動作を付与する伝達部材としての水平送りロッド49と、針板下方に設けられた送り歯44により縫製方向Fに沿って被縫製物を送る布送り機構30と、一針あたりの上記針送り機構14、上送り機構及び布送り機構30による送り量を調節する送り量調節機構51と,下軸37により回転駆動が行われる図示を省略した釜機構80と、上糸及び下糸を切断する糸切り装置70(図6参照)と、上記各構成の動作制御を行う制御装置90とを備えている。
[Overall Configuration of Embodiment]
FIG. 1 is a mechanism diagram of the needle feed sewing machine 1. As shown in FIG. 1, a needle feed sewing machine 1 (hereinafter simply referred to as a sewing machine 1) includes a sewing machine frame 2, an upper shaft 9 as a main shaft that is rotatably supported in the sewing machine frame 2, and the upper shaft 9. The sewing machine motor 60 is a rotational drive source that applies a rotational force to the needle, the needle feed mechanism 14 that drives the needle bar 13 up and down by the drive of the sewing machine motor 60, and swings along the sewing direction F, and the eccentric cam 61. The article to be sewn is fed along the sewing direction F by a horizontal feed rod 49 as a transmission member that gives the needle feed mechanism 14 a reciprocating swinging motion by being driven as a knot, and a feed dog 44 provided below the needle plate. The cloth feed mechanism 30, the needle feed mechanism 14 per one needle, the feed amount adjusting mechanism 51 for adjusting the feed amount by the upper feed mechanism and the cloth feed mechanism 30, and the rotation driving by the lower shaft 37 are not shown. A shuttle mechanism 80, a thread cutting device 70 for cutting the upper thread and lower thread (see FIG. 6), and a control unit 90 for controlling the operation of each of the above structures.

[ミシンアーム側の構成]
まず、ミシンフレーム2におけるミシンアーム8側の構成について説明する。図1に示すように、ミシンアーム8の内部には、当該ミシンアーム8に回動自在に支持された上軸9と、この上軸9に対して平行に配置されて回動自在に支持された針棒揺動軸10とが設けられている。これら上軸9及び針棒揺動軸10は縫製方向Fに対して直行するY軸方向に沿って延在している。上軸9には、回転駆動源としてのミシンモーター60が接続されており、このミシンモーター60の回転に伴い上軸9が回転する。
[Configuration on the machine arm side]
First, the configuration of the sewing machine arm 2 on the sewing machine arm 2 side will be described. As shown in FIG. 1, inside the sewing machine arm 8, an upper shaft 9 rotatably supported by the sewing machine arm 8 and a parallel arrangement with respect to the upper shaft 9 are rotatably supported. A needle bar swinging shaft 10 is provided. The upper shaft 9 and the needle bar swinging shaft 10 extend along the Y-axis direction perpendicular to the sewing direction F. A sewing machine motor 60 as a rotational drive source is connected to the upper shaft 9, and the upper shaft 9 rotates as the sewing machine motor 60 rotates.

[針送り機構]
針棒揺動台11は図1に示すように、針棒揺動軸10に支持されており、Y軸回りに揺動可能となっている。この針棒揺動台11は、縫い針13を下端部で保持する針棒13を上下動可能に支持している。
また、針棒揺動軸10の他端には、縫い針13の上下動周期と同期する送り歯44と同じ周期で揺動を行う針棒揺動桿59が連結されている。そして、針棒揺動軸10は、針棒揺動桿59を介して布送り機構30と連結されていることにより、送り歯44の送り動作と同期して針棒13を揺動させている。
[Needle feed mechanism]
As shown in FIG. 1, the needle bar swing base 11 is supported by a needle bar swing shaft 10 and can swing about the Y axis. The needle bar rocking base 11 supports a needle bar 13 that holds the sewing needle 13 at its lower end so as to be movable up and down.
The other end of the needle bar swing shaft 10 is connected to a needle bar swing bar 59 that swings at the same cycle as the feed dog 44 synchronized with the vertical movement cycle of the sewing needle 13. The needle bar swinging shaft 10 is connected to the cloth feed mechanism 30 via a needle bar swinging rod 59, thereby swinging the needle bar 13 in synchronization with the feed operation of the feed dog 44. .

また、針棒揺動軸10の回動に伴い針棒揺動台11が揺動されると、針棒13の下端部が縫製方向Fに揺動される。つまり、上軸9、針棒揺動桿59、針棒揺動軸10及び針棒揺動台11により、縫製方向Fに沿って針棒13を揺動させる針送り機構が構成されている。
また、針棒13は、上軸9に取り付けられた偏心カム15にリンク部材16を介して連結されており、上軸9の回転に連動して上下動を行う。すなわち、上軸9、偏心カム15及びリンク部材16により、縫い針13に上下動を付与する針棒上下動機構が構成されている。そして、上記針送り機構及び針棒上下動機構は、それぞれ上軸9の回転に伴い駆動されることで互いに連動するようになっており、これら針送り機構及び針棒上下動機構により、縫い針13が被縫製物を下方に貫通した状態で縫製方向Fに送る針送り機構14が構成されている。
Further, when the needle bar swinging base 11 is swung with the rotation of the needle bar swinging shaft 10, the lower end portion of the needle bar 13 is swung in the sewing direction F. That is, the upper shaft 9, the needle bar swinging rod 59, the needle bar swinging shaft 10 and the needle bar swinging base 11 constitute a needle feed mechanism for swinging the needle bar 13 along the sewing direction F.
The needle bar 13 is connected to an eccentric cam 15 attached to the upper shaft 9 via a link member 16, and moves up and down in conjunction with the rotation of the upper shaft 9. In other words, the upper shaft 9, the eccentric cam 15, and the link member 16 constitute a needle bar vertical movement mechanism that applies vertical movement to the sewing needle 13. The needle feed mechanism and the needle bar vertical movement mechanism are interlocked with each other by being driven as the upper shaft 9 is rotated. A needle feed mechanism 14 is configured to feed the sewing product 13 in the sewing direction F in a state in which the product 13 penetrates the sewing product downward.

[ミシンベッド側の構成]
次に、ミシンフレーム2におけるミシンベッド50側の構成について説明する。図1及び図2に示すように、ミシンベッド50の内部には、プーリ34,35及びベルト36を介して上軸9と連結され該上軸9に連動して全回転する下軸37と、下軸37に平行に配置され回動自在に支持された上下送り軸38及び水平送り軸39とが設けられている。
[Configuration on the machine bed side]
Next, the configuration of the sewing machine frame 2 on the machine bed 50 side will be described. As shown in FIGS. 1 and 2, inside the sewing machine bed 50, a lower shaft 37 that is connected to the upper shaft 9 via pulleys 34, 35 and a belt 36 and rotates in full rotation in conjunction with the upper shaft 9, There are provided a vertical feed shaft 38 and a horizontal feed shaft 39 which are arranged in parallel to the lower shaft 37 and are rotatably supported.

[布送り機構]
下軸37には、偏心カムを介して略水平方向(X軸方向)に延在する上下送りロッド46の一端が連結されており、該上下送りロッド46の他端は、上下送り軸38の上部に突設された上下送り軸腕45に回動自在に連結されている。上下送り軸38は、水平方向に向けて突設された延出部40を有し、該延出部40には送り歯44を支持する送り台42の一端がリンク部材41を介して回動自在に連結されている。そして、下軸37の全回転に伴い上下送りロッド46がX軸方向に揺動されると、上下送り軸38が往復回動を行い、該上下送り軸38の回動に応じて延出部40及びリンク部材41を介して送り台42に上下方向の揺動が付与される。
[Cloth feed mechanism]
One end of a vertical feed rod 46 extending in a substantially horizontal direction (X-axis direction) is connected to the lower shaft 37 via an eccentric cam. The other end of the vertical feed rod 46 is connected to the vertical feed shaft 38. It is rotatably connected to a vertical feed shaft arm 45 projecting from the top. The vertical feed shaft 38 has an extending portion 40 that protrudes in the horizontal direction, and one end of a feed base 42 that supports the feed dog 44 rotates through the link member 41 in the extending portion 40. It is connected freely. When the vertical feed rod 46 is swung in the X-axis direction along with the full rotation of the lower shaft 37, the vertical feed shaft 38 reciprocates and the extension portion is moved according to the rotation of the vertical feed shaft 38. A vertical swing is applied to the feed base 42 via the link member 41 and the link member 41.

また、下軸37には当該下軸37に固定された円形の偏心カム61を介して水平送りロッド49の下端が回動自在に連結されている。かかる水平送りロッド49の上端は、当該水平送りロッド49の上方でX軸方向に沿って設けられた略へ字状のベルクランク48の中央部に回動自在に連結されている。ベルクランク48の一端は、水平送り軸39の上部に突設された水平送り軸腕47に回動自在に連結されており、ベルクランク48の他端は支軸55を介して角駒54が回動可能に装備され、当該角駒54を介して後述する送り量変換体52の溝部53内に摺動自在に連結されている。そして、下軸37の回転に応じて水平送りロッド49が上下に揺動されると、送り量変換体52(後述する)に形成された溝部53の傾きに応じてベルクランク48がX軸方向に揺動され、水平送り軸39に往復回動力が付与される。これにより、水平送り軸39から上方に延出された送り台腕43を介して、送り台42の上部に支持された送り歯44に水平方向の揺動が付与される。   Further, a lower end of a horizontal feed rod 49 is rotatably connected to the lower shaft 37 via a circular eccentric cam 61 fixed to the lower shaft 37. The upper end of the horizontal feed rod 49 is pivotally connected to the central portion of a substantially bell-shaped bell crank 48 provided along the X-axis direction above the horizontal feed rod 49. One end of the bell crank 48 is rotatably connected to a horizontal feed shaft arm 47 protruding from the top of the horizontal feed shaft 39, and the other end of the bell crank 48 is connected to a square piece 54 via a support shaft 55. It is rotatably mounted and is slidably connected in a groove 53 of a feed amount conversion body 52 to be described later via the square piece 54. When the horizontal feed rod 49 is swung up and down in accordance with the rotation of the lower shaft 37, the bell crank 48 is moved in the X-axis direction in accordance with the inclination of a groove 53 formed in a feed amount conversion body 52 (described later). And the reciprocating power is applied to the horizontal feed shaft 39. As a result, a horizontal swing is applied to the feed dog 44 supported on the upper portion of the feed base 42 via the feed base arm 43 extending upward from the horizontal feed shaft 39.

また、水平送り軸39は、送り歯44側とは逆側の端部には、上方に延出された伝達腕33を備え、リンク部材32を介して針棒揺動軸10に固定連結された針棒揺動桿59の下端部に連結されており、当該水平送り軸39の回動駆動力が針棒揺動桿59を介して針棒揺動軸10に伝達されるようになっている。つまり、下軸37の回転に伴い、偏心カム61、水平送りロッド49、ベルクランク48、水平送り軸39、伝達腕33、リンク部材32、針棒揺動桿59、針棒揺動軸10及び針棒揺動台11を介して針棒13に水平方向の揺動力が伝達されるようになっている。なお、水平送り軸39は、後述する送り量調節機構51によってその往復回動角度及び位相が調節される。そして、水平送り軸39の往復回動角度及び位相が送り量調節機構51によって調節されると、針棒13の揺動角度量及び位相も同時に調節され、当該水平送り軸39の回動量に応じた水平移動量すなわち送りピッチで被縫製物を正方向又は逆方向に送るようになっている。   Further, the horizontal feed shaft 39 is provided with a transmission arm 33 extending upward at the end opposite to the feed dog 44 side, and is fixedly connected to the needle bar swinging shaft 10 via the link member 32. Further, the rotational driving force of the horizontal feed shaft 39 is transmitted to the needle bar swing shaft 10 through the needle bar swing shaft 59. Yes. That is, as the lower shaft 37 rotates, the eccentric cam 61, the horizontal feed rod 49, the bell crank 48, the horizontal feed shaft 39, the transmission arm 33, the link member 32, the needle bar swing rod 59, the needle bar swing shaft 10 and A horizontal swing force is transmitted to the needle bar 13 via the needle bar swing base 11. The horizontal feed shaft 39 has its reciprocating rotation angle and phase adjusted by a feed amount adjusting mechanism 51 described later. When the reciprocating rotation angle and phase of the horizontal feed shaft 39 are adjusted by the feed amount adjusting mechanism 51, the swing angle amount and phase of the needle bar 13 are also adjusted at the same time, depending on the rotation amount of the horizontal feed shaft 39. The sewing product is fed in the forward direction or the reverse direction with a horizontal movement amount, that is, a feed pitch.

また、上記送り歯44は、針送りミシンであるため図2に示すようにその中央部に上下に貫通する針穴44aが形成されており、布送りの際には縫い針13が針穴44aに挿入された状態で送り方向への移動が行われる。   Further, since the feed dog 44 is a needle feed sewing machine, as shown in FIG. 2, a needle hole 44a penetrating vertically is formed in the central portion thereof, and the sewing needle 13 is fed into the needle hole 44a when cloth is fed. The movement in the feeding direction is performed in the state inserted in.

[送り量調節機構]
図1及び図2に示すように、ミシンベッド50の内部には、ミシンフレーム2に回動可能に支持され、その回動中心線方向に直交する方向に沿う溝部53を有する送り量変換体52が設けられている。送り量変換体52の溝部53には、角駒54を介してベルクランク48の一端が該溝部53の長手方向に沿って摺動自在に連結されている(図3参照)。
図5は、送り量変換体52と送り調節モーター4との関係を表す分解斜視図である。この図5に示すように、送り量変換体52は、アーム部材56、リンク部材57及び揺動軸58を介して送り調節モーター4に連結されている。
ここで、送り量変換体52が回動すると溝部53も回動するため、角駒54を介してベルクランク48の一端の水平方向における移動量が変化することとなる。具体的には、溝部53が水平に近ければベルクランク48の水平方向における移動量は大きくなり、逆に垂直に近ければ水平方向における移動量は小さくなる(図4参照)。つまり、送り調節モーター4の駆動により送り量変換体52を回動することで、送り歯44による送り量(送りピッチ)が調節できるようになっている。また、送り量が0となる位置からさらに送り量変換体52を回動すると、位相が反転して伝わり、送り方向を逆方向に変換することも可能である。この場合も、さらに回動を行えば、逆方向の送り量も調節することが可能である。
また、本実施形態では、布送り機構及び針送り機構が互いに連動し、これら各機構が協働して針送りを行うため、送り量調節機構51によって布送り機構30の送り量が調節された際には、針棒揺動桿59を介して針振り量も同時に調節されることとなる。
[Feed adjustment mechanism]
As shown in FIGS. 1 and 2, a feed amount conversion body 52 having a groove portion 53 that is rotatably supported by the sewing machine frame 2 and extends in a direction orthogonal to the rotation center line direction inside the sewing machine bed 50. Is provided. One end of a bell crank 48 is slidably connected to the groove 53 of the feed amount converter 52 via a square piece 54 along the longitudinal direction of the groove 53 (see FIG. 3).
FIG. 5 is an exploded perspective view showing the relationship between the feed amount conversion body 52 and the feed adjustment motor 4. As shown in FIG. 5, the feed amount conversion body 52 is connected to the feed adjustment motor 4 via an arm member 56, a link member 57 and a swing shaft 58.
Here, when the feed amount conversion body 52 rotates, the groove portion 53 also rotates, so that the amount of movement of one end of the bell crank 48 in the horizontal direction changes via the square piece 54. Specifically, the movement amount of the bell crank 48 in the horizontal direction increases when the groove 53 is close to the horizontal, and the movement amount in the horizontal direction decreases when the groove 53 is close to the vertical (see FIG. 4). That is, the feed amount by the feed dog 44 (feed pitch) can be adjusted by rotating the feed amount conversion body 52 by driving the feed adjustment motor 4. Further, when the feed amount converter 52 is further rotated from the position where the feed amount becomes 0, the phase is reversed and transmitted, and the feed direction can be converted to the reverse direction. Also in this case, the feed amount in the reverse direction can be adjusted by further rotating.
Further, in this embodiment, the cloth feed mechanism and the needle feed mechanism are interlocked with each other, and these mechanisms cooperate to perform the needle feed. Therefore, the feed amount of the cloth feed mechanism 30 is adjusted by the feed amount adjustment mechanism 51. At this time, the needle swinging amount is also adjusted simultaneously via the needle bar swinging rod 59.

[釜機構]
釜機構80は、送り歯44の下方に配置された水平釜81と、下軸37に固定装備された主動傘歯車82と、主動傘歯車82に噛合すると共に釜軸を介して水平釜にトルクを伝達する従動傘歯車83とを備えている。主動傘歯車82から従動傘歯車83へは二倍速に増速されて回転が付与され、これにより、水平釜81は縫い針13の上下動頻度に対して二倍の回転を行うようになっている。
[Hook mechanism]
The hook mechanism 80 meshes with the horizontal hook 81 disposed below the feed dog 44, the main bevel gear 82 fixedly mounted on the lower shaft 37, the main bevel gear 82, and torques the horizontal hook via the hook shaft. And a driven bevel gear 83 that transmits From the main bevel gear 82 to the driven bevel gear 83, the rotation is increased at a double speed, and the rotation is imparted. As a result, the horizontal hook 81 rotates twice the vertical movement frequency of the sewing needle 13. Yes.

[糸切り装置]
図6は糸切り装置70の斜視図である。糸切り装置70は、図示しない針板と水平釜81との間の領域で、回動によりその先端部が布送り方向Fに沿って往復動作を行って上糸及び下糸を捕捉する動メス71と、往復動作を行う動メス71の復路側の所定位置で待機して動メス71との協働により上糸及び下糸の切断を行う固定メス72と、下軸37に固定装備され外周面にカム溝が形成されたカム73と、カム溝に嵌合可能なカムコロ74と、カムコロ74を保持し、カム溝により回動動作を付与される伝達軸75と、カムコロ74をカム溝内に導き込む糸切りソレノイド76とを備えている。
カムコロ74は、糸切りソレノイド76が作動すると、所定の上軸角度でカム溝の入り口から溝内に侵入し、カム溝の形状に従って伝達軸75を介して動メス71に往復回動動作を付与し、糸切り完了後はカム溝の出口から排出される構造となっている。
[Thread trimming device]
FIG. 6 is a perspective view of the thread trimming device 70. The thread trimming device 70 is a moving knife that captures an upper thread and a lower thread by reciprocating the tip part along the cloth feeding direction F by rotation in an area between a needle plate (not shown) and the horizontal hook 81. 71, a fixed knife 72 that cuts an upper thread and a lower thread by cooperating with the moving knife 71 by waiting at a predetermined position on the return path side of the moving knife 71 that performs reciprocating movement, and an outer periphery fixed to the lower shaft 37 A cam 73 having a cam groove formed on the surface thereof, a cam roller 74 that can be fitted into the cam groove, a transmission shaft 75 that holds the cam roller 74 and is given a turning action by the cam groove, and the cam roller 74 in the cam groove. And a thread trimming solenoid 76 for guiding the thread.
When the thread trimming solenoid 76 is actuated, the cam roller 74 enters the groove from the entrance of the cam groove at a predetermined upper shaft angle, and gives a reciprocating rotation operation to the moving knife 71 via the transmission shaft 75 according to the shape of the cam groove. And after thread trimming is complete, it is discharged from the exit of the cam groove.

図6において、直線Nは針棒12が垂直となる回動中心に位置する場合の針棒及び縫い針13の延長線を示している。
上記の糸切り装置70では、動メス71が固定メス72との協働により糸切りを行う切断位置が、上記延長線N及び当該延長線Nを中心として設定可能な最大針振り幅で針振りを行う場合の縫い針の到達する全範囲よりも正の布送り方向Fにおける下流側となるように設定されている。
In FIG. 6, a straight line N indicates an extension line of the needle bar and the sewing needle 13 when the needle bar 12 is positioned at the center of rotation where the needle bar 12 is vertical.
In the thread trimming device 70 described above, the cutting position at which the moving knife 71 performs thread trimming in cooperation with the fixed knife 72 is the extension line N and the maximum needle swing width that can be set around the extension line N. Is set to be downstream in the positive cloth feed direction F with respect to the entire range reached by the sewing needle when performing.

[ミシンの制御系]
上記ミシン1の制御系を図7のブロック図に示す。この図7に示すように、ミシン1は、各構成の動作制御を行う制御装置90を備えており、当該制御装置90は、ミシン1の角の動作制御を行うプログラムその他の初期データが記憶されたROM92と、ROM92内のプログラムを実行するCPU91と、CPU91の処理におけるデータ記憶領域となるRAM93と、書き換えを要する各種の設定データが記憶されるEEPROM94とを備えている。
[Sewing machine control system]
The control system of the sewing machine 1 is shown in the block diagram of FIG. As shown in FIG. 7, the sewing machine 1 includes a control device 90 that controls the operation of each component. The control device 90 stores a program that controls the operation of the corners of the sewing machine 1 and other initial data. ROM 92, CPU 91 for executing a program in ROM 92, RAM 93 serving as a data storage area in the processing of CPU 91, and EEPROM 94 for storing various setting data requiring rewriting.

また、上記制御装置90にはミシンモーター60の回転速度等を制御するためのモーター駆動回路60aを介してミシンモーター60が接続されている。このミシンモーター60には、その回転角度を検出するエンコーダー62が併設されており、制御装置90は、このエンコーダー62の出力から上軸9の検出を行っている。
また、この制御装置90には、各々の動作を制御するための駆動回路4a,76aを介して調節モーター4及び糸切りソレノイド76が接続されている。
さらに、制御装置90には、縫いピッチなどの設定入力や所定情報の表示を行う入力装置と表示画面を備える操作パネル95、ミシン1の操作を指示入力するペダル96がインターフェイス97を介して接続されている。
ペダル96は前踏みの踏み込みで縫製を開始、踏み込み解除で停止、後踏みで糸切りの実行を指示入力する。
The control device 90 is connected to the sewing machine motor 60 via a motor drive circuit 60a for controlling the rotational speed of the sewing machine motor 60 and the like. The sewing machine motor 60 is provided with an encoder 62 for detecting the rotation angle thereof, and the control device 90 detects the upper shaft 9 from the output of the encoder 62.
The control device 90 is connected to the adjusting motor 4 and the thread trimming solenoid 76 via drive circuits 4a and 76a for controlling the respective operations.
Further, an input device for setting input such as a sewing pitch and displaying predetermined information, an operation panel 95 having a display screen, and a pedal 96 for instructing operation of the sewing machine 1 are connected to the control device 90 via an interface 97. ing.
The pedal 96 starts sewing when the front pedal is depressed, stops when the pedal is released, and inputs a thread trimming instruction when the rear pedal is depressed.

次に、縫いピッチの設定について説明する。
操作パネル95から入力する縫いピッチは、通常の縫製のピッチ幅として、正の送り方向と逆の送り方向とについてそれぞれ設定範囲が下限値Pmin〜上限値Pmaxまでの範囲に定められており(例えば、設定範囲中の下限値Pminが2.5[mm]、設定範囲中の上限値Pmaxが9[mm])、その範囲内で0.5[mm]単位での設定が可能となっている。設定範囲中の上限値は針振りが行われる縫い針13と動メス71固定メス72などの干渉等が生じないようにするための機構構造上の限界となる最大範囲である。
また、通常の縫製とは別にコンデンス縫いと呼ばれる縫製を行うことができるミシンが存在し、このコンデンス縫いの送りピッチは操作パネル95から入力する通常の縫製の設定範囲中の下限値(2.5[mm])よりもさらに小さいコンデンス縫いピッチPcoを定めている(例えば1[mm])。つまり、このミシンでは「送り量調節機構により調節可能な最大ピッチ」は9[mm]であり、「送り量調節機構により調節可能な最小ピッチ」は1[mm]となっている。
そして、設定の際には、通常送りかコンデンス縫いかを選択し、通常縫いの場合には2.5〜9[mm]の範囲で0.5[mm]単位で定められた数値を選択し、送り方向の正逆も設定する。また、コンデンス縫いを選択した場合には自動的にピッチPco(1[mm])が確定し、送り方向の正逆の設定を行う。
なお、本願ではコンデンス縫いの機能を有するミシンを例に挙げ説明するが、例えば、コンデンス縫いの機能などを持たないミシンの場合には、操作パネルなどにより設定可能な通常の縫製のピッチ幅の設定範囲における下限値を「送り量調節機構により調節可能な最小ピッチ」としても良いし、通常の縫製のピッチ幅の設定範囲から逸脱してより小さい糸切断時の専用のピッチ幅を定めて「送り量調節機構により調節可能な最小ピッチ」としても良い。
また、操作パネル95から設定入力される送りピッチの値と当該送りピッチにするための回動角度に送り量変換体52を位置決めするための調節モーター4の動作量との対応を示すテーブルはROM92内に予め用意されており、選択されたピッチに応じて調節モーター4の動作量が確定する。
Next, setting of the sewing pitch will be described.
The sewing pitch input from the operation panel 95 is set to a range from a lower limit value Pmin to an upper limit value Pmax for the normal feed pitch width and the reverse feed direction as normal sewing pitch widths (for example, The lower limit value Pmin in the setting range is 2.5 [mm] and the upper limit value Pmax in the setting range is 9 [mm]), and the setting can be made in units of 0.5 [mm] within the range. The upper limit value in the set range is a maximum range that is a limit on the mechanism structure for preventing interference between the sewing needle 13 where the needle swing is performed and the moving knife 71 fixed knife 72 and the like.
In addition to normal sewing, there are sewing machines that can perform sewing called condensation sewing. The feed pitch of this condensation sewing is the lower limit (2.5 [mm] in the normal sewing setting range input from the operation panel 95. ]), Which is a smaller condensation stitching pitch Pco (for example, 1 [mm]). That is, in this sewing machine, the “maximum pitch adjustable by the feed amount adjusting mechanism” is 9 [mm], and the “minimum pitch adjustable by the feed amount adjusting mechanism” is 1 [mm].
When setting, select either normal feed or condensation stitching, and for normal stitching, select a value set in units of 0.5 [mm] in the range of 2.5 to 9 [mm], and change the feed direction. Set forward and reverse. When condensed sewing is selected, the pitch Pco (1 [mm]) is automatically determined and the forward / reverse setting of the feed direction is performed.
In this application, a sewing machine having a function of condensation sewing will be described as an example. However, for example, in the case of a sewing machine having no function of condensation sewing, setting of a normal sewing pitch width that can be set by an operation panel or the like. The lower limit of the range may be the “minimum pitch that can be adjusted by the feed amount adjustment mechanism”, or it may deviate from the normal sewing pitch width setting range and set a dedicated pitch width for smaller thread cutting. It is good also as "the minimum pitch which can be adjusted with a quantity adjustment mechanism."
A table showing the correspondence between the value of the feed pitch set and inputted from the operation panel 95 and the operation amount of the adjusting motor 4 for positioning the feed amount converter 52 at the rotation angle for obtaining the feed pitch is a ROM 92. The amount of operation of the adjusting motor 4 is determined according to the selected pitch.

[縫製及び糸切りの動作制御]
制御装置90によるミシン1の動作制御について、図8のフローチャートと図9及び図10の動作説明図と図11の送り歯44の位置変化を示す説明図とにより説明を行う。なお、図11は横軸が上軸角度、縦軸が送り歯の縫製方向における位置を示し、縦軸の0位置は送り歯44の原点位置(上軸角度0°における位置。なお、針棒上死点を上軸角度の0°とする)であり、縦軸の0位置より上が原点位置より正の送り方向上流側(図9、10においては左側)の位置、縦軸の0位置より下が原点位置より正の送り方向下流側(図9,10においては右側)の位置を示す。この例の場合には、正方向の通常送りで設定ピッチを4[mm]とした場合を例示する。
また、図9及び図10において符号17はミシンベッド部50の上面の針落ち位置に設けられた針板であり、符号Cは被縫製物としての布地である。また、これらの図では動メス71の図示を省略して固定メス72(切断位置)のみを図示している。
[Operation control of sewing and thread trimming]
The operation control of the sewing machine 1 by the control device 90 will be described with reference to the flowchart of FIG. 8, the operation explanatory diagrams of FIGS. 9 and 10, and the explanatory view showing the position change of the feed dog 44 of FIG. 11. In FIG. 11, the horizontal axis indicates the upper axis angle, the vertical axis indicates the position of the feed dog in the sewing direction, and the 0 position on the vertical axis indicates the origin position of the feed dog 44 (the position at the upper axis angle of 0 °. Needle bar The top dead center is 0 ° of the upper axis angle), and the position above the zero position on the vertical axis is upstream of the origin position in the positive feed direction (left side in FIGS. 9 and 10), and the zero position on the vertical axis. The position below is the position downstream in the positive feed direction from the origin position (the right side in FIGS. 9 and 10). In the case of this example, a case where the set pitch is set to 4 [mm] by normal feed in the forward direction is illustrated.
9 and 10, reference numeral 17 denotes a needle plate provided at a needle drop position on the upper surface of the sewing machine bed portion 50, and reference numeral C denotes a fabric as a sewing object. In these drawings, the moving knife 71 is not shown, and only the fixed knife 72 (cutting position) is shown.

ペダル96の前踏みが行われると縫製動作制御が開始される。制御装置90は、まず、現在設定されている縫いピッチ(設定ピッチとする)を読み込んで、調節モーター4により設定ピッチとなるように送り量変換体52が回動される(ステップS1)。
次いで、ミシンモーター60の駆動が開始され、設定ピッチでの針送りによる縫製が行われる(ステップS3)。
When the pedal 96 is stepped forward, sewing operation control is started. First, the control device 90 reads the currently set sewing pitch (referred to as the set pitch), and the feed amount converter 52 is rotated by the adjustment motor 4 so that the set pitch is obtained (step S1).
Next, the driving of the sewing machine motor 60 is started, and sewing is performed by needle feed at a set pitch (step S3).

その後、制御装置90はペダル96の後踏みによる信号入力を監視して(ステップS5)、当該後踏みによる信号が検出されると、制御装置90はエンコーダー62の出力の監視状態となる(ステップS7)。
そして、エンコーダー62の出力が下停止位置(上軸角度230°[針棒上死点を0°とする])に到達すると(図9(A)[230°]参照)、制御装置90は、調節モーター4を制御して縫いピッチを正の送り方向のコンデンス縫いピッチPcoに設定する(ステップS9、図11[1]参照)。
After that, the control device 90 monitors the signal input by stepping on the pedal 96 (step S5), and when the signal by the back stepping is detected, the control device 90 enters the monitoring state of the output of the encoder 62 (step S7). ).
When the output of the encoder 62 reaches the lower stop position (upper shaft angle 230 ° [needle bar top dead center is 0 °]) (see FIG. 9A [230 °]), the control device 90 The adjustment motor 4 is controlled to set the sewing pitch to the condensation sewing pitch Pco in the positive feed direction (see step S9, FIG. 11 [1]).

送り歯44は,通常は、上軸角度で90〜270°の範囲で針板17の上面から突出して布地Cの下面に接触して送りを行う。従って、上軸角度230°では、それまでの設定ピッチ(4[mm])で布地Cを搬送している途中の状態にあり、このタイミングで設定ピッチが変更されると、送り歯44は新たな設定ピッチであるコンデンス縫いピッチPco分の移動しか行わないことになる(図9(B)[240°]参照)。
なお、この段階での針落ち位置が上糸と下糸が絡み合う最終の結節を形成する針落ちが行われる「最終結節点」となる(図9(B)の符号TL)。この糸切り制御では、最終結節点後にコンデンス縫いピッチPcoでもう一針の針落ち(最終針落ち)が行われるが、当該最終針落ちの後に布地の下で糸切りが行われるので、結節が行われず縫い目が形成されない。
Usually, the feed dog 44 protrudes from the upper surface of the needle plate 17 in the range of 90 to 270 ° in the upper axis angle and feeds by contacting the lower surface of the fabric C. Therefore, when the upper shaft angle is 230 °, the fabric C is being conveyed at the set pitch (4 [mm]) until then, and when the set pitch is changed at this timing, the feed dog 44 is newly set. Only the movement corresponding to the condensation sewing pitch Pco, which is a set pitch, is performed (see [240 °] in FIG. 9B).
It should be noted that the needle drop position at this stage is the “final knot point” where the needle drop that forms the final knot in which the upper thread and the lower thread are intertwined (reference numeral TL in FIG. 9B). In this thread trimming control, another needle drop (final needle drop) is performed at the condensation sewing pitch Pco after the final knot point, but since the thread is trimmed under the fabric after the final needle drop, the knot is No seam is formed.

なお、制御装置90は、コンデンス縫いピッチPcoに設定した後には、次の針落ちである最終針落ちによる布地Cに対する縫い針13の貫通状態である針貫通位置(上軸角度で180°)の到達待ちとなる(ステップS11)。
そして、この間、コンデンス縫いピッチPcoで布地が送られて、送り歯44が下降して布地Cから離れ(図9(C)[0°]参照)、さらに、ミシンモーター60の駆動が進められて、再び、送り歯44が上昇して布地Cに接触する(図9(D)[90°]参照)。
After setting the condensation sewing pitch Pco, the control device 90 sets the needle penetration position (upper shaft angle 180 °) which is the penetration state of the sewing needle 13 with respect to the fabric C due to the final needle drop which is the next needle drop. Waiting for arrival (step S11).
During this time, the fabric is fed at the condensation stitching pitch Pco, the feed dog 44 descends and leaves the fabric C (see [0 °] in FIG. 9C), and the drive of the sewing machine motor 60 is further advanced. Again, the feed dog 44 rises and contacts the fabric C (see FIG. 9D [90 °]).

そして、縫い針13が布地Cに突き刺さり(図9(E)[120°]参照)、さらに、縫い針13が下死点まで到達すると(図10(F)[180°]参照)、制御装置90は、調節モーター4により、縫いピッチを正の送り方向の最大ピッチである上限値Pmax(9[mm])に切り換える(ステップS13、図11[2]参照)。
そして、エンコーダー62の出力が下停止位置(上軸角度230°)に到達すると(ステップS15)、糸切りソレノイド76を作動させて糸切り装置70のカムコロ74をカム73のカム溝に押し込む(ステップS17、図11[3]参照)。これにより、糸切り装置70では糸切り動作が開始される。これ以降は、糸切断動作のためにミシンモーター60の回転速度を所定の低速状態に減速させる。
When the sewing needle 13 pierces the fabric C (see FIG. 9 (E) [120 °]) and further reaches the bottom dead center (see FIG. 10 (F) [180 °]), the control device 90, the adjusting motor 4 switches the sewing pitch to the upper limit value Pmax (9 [mm]) which is the maximum pitch in the positive feed direction (see step S13, FIG. 11 [2]).
When the output of the encoder 62 reaches the lower stop position (upper shaft angle 230 °) (step S15), the thread trimmer solenoid 76 is actuated to push the cam roller 74 of the thread trimmer 70 into the cam groove of the cam 73 (step S15). S17, see FIG. 11 [3]). Thereby, the thread trimming device 70 starts the thread trimming operation. Thereafter, the rotational speed of the sewing machine motor 60 is reduced to a predetermined low speed state for the yarn cutting operation.

そして、制御装置90は、正の送り方向の最大ピッチPmaxに設定した後には、送り歯44が布地から離間した状態である送り歯離間位置(上軸角度で0°)の到達待ちとなる(ステップS19)。
そして、この間、送り歯44は最大ピッチPmaxで前進移動を行い、送り歯44が搬送可能な範囲で固定メス72による切断位置に最も近接する位置まで最終結節点TLの次の針落ち位置である最終針落ち位置TCを搬送する(図10(G)[270°]参照)。
Then, after setting the maximum pitch Pmax in the positive feed direction, the control device 90 waits to reach the feed dog separation position (upper axis angle of 0 °) in which the feed dog 44 is separated from the fabric ( Step S19).
During this time, the feed dog 44 moves forward at the maximum pitch Pmax and is the needle drop position next to the final knot point TL up to the position closest to the cutting position by the fixed knife 72 within the range in which the feed dog 44 can be conveyed. The final needle drop position TC is conveyed (see FIG. 10G [270 °]).

さらに、送り歯44が下降して布地Cから離れ、上軸角度が送り歯離間位置(0°)に到達すると(図10(H)[0°]参照)、制御装置90は、調節モーター4により、縫いピッチを逆の送り方向の最大ピッチである上限値Pmax(9[mm])に切り換える(ステップS21、図11[4]参照)。
これにより、固定メス72による切断位置から離れる方向に移動していた送り歯44は移動方向が逆転して再び固定メス72による切断位置側へ戻り始める。
そして、上軸角度50°において、糸切り装置70は送り歯44の針穴44aから下方に延びる上糸及び下糸を固定メス72による切断位置まで運び、切断を行う(ステップS23、図10(J)[50°]参照)。
そして、ミシンモーター60の駆動が停止して、縫製から糸切りまでの動作が完了する。
Further, when the feed dog 44 descends and separates from the fabric C and the upper shaft angle reaches the feed dog separation position (0 °) (see FIG. 10 (H) [0 °]), the control device 90 controls the adjustment motor 4. Thus, the sewing pitch is switched to the upper limit value Pmax (9 [mm]) which is the maximum pitch in the reverse feed direction (see step S21, FIG. 11 [4]).
As a result, the feed dog 44 that has moved in the direction away from the cutting position by the fixed knife 72 reverses its moving direction and starts to return to the cutting position by the fixed knife 72 again.
At an upper shaft angle of 50 °, the thread trimmer 70 carries the upper thread and lower thread extending downward from the needle hole 44a of the feed dog 44 to the cutting position by the fixed knife 72 and performs cutting (step S23, FIG. 10 ( J) See [50 °]).
Then, the drive of the sewing machine motor 60 is stopped, and the operation from sewing to thread trimming is completed.

[実施形態の技術的効果]
以上のように、制御装置90の縫製・糸切りの動作制御により、最終結節点TLの次の針落ち(最終針落ち)がコンデンス縫いピッチPcoで行われた後、当該最終針落ち位置TCは正の布送り方向に最大ピッチである上限値Pmaxにより、固定メス72による切断位置に最大限に寄せられる。
さらに、送り歯44は、糸切り直前で逆の布送り方向に最大ピッチである上限値Pmaxで固定メス72による切断位置に戻される。
[Technical effects of the embodiment]
As described above, after the needle drop after the final knot point TL (final needle drop) is performed at the condensed sewing pitch Pco by the sewing / thread trimming operation control of the control device 90, the final needle drop position TC is By the upper limit value Pmax which is the maximum pitch in the positive cloth feeding direction, the cutting position by the fixed knife 72 is maximized.
Further, the feed dog 44 is returned to the cutting position by the fixed knife 72 at the upper limit value Pmax which is the maximum pitch in the reverse cloth feed direction immediately before the thread trimming.

これらの結果、上糸は、最終結節点TL→最終針落ち位置TC→送り歯44の針穴44a→固定メス72による切断位置となる経路で切断され、下糸は、最終結節点TL→送り歯44の針穴44a→固定メス72による切断位置となる経路で切断される。
(1)最終結節点TL−最終針落ち位置TCの間の距離は、最小のピッチであるコンデンス縫いピッチPcoとされることで短縮化されている。
(2)最終針落ち位置TC−送り歯44の針穴44aの間の距離は、いずれも最大ピッチである上限値Pmaxで固定メス72による切断位置側に寄せられることで相互に近接し、短縮化されている。
(3)送り歯44の針穴44a−固定メス72による切断位置の間の距離は、最大ピッチである上限値Pmaxで送り歯44が固定メス72による切断位置側に寄せられることで近接し、短縮化されている。
(4)最終結節点TL−送り歯44の針穴44aの間の距離は、最大ピッチである上限値Pmaxで送り歯44が固定メス72による切断位置側に寄せられることで短縮化されている。
As a result, the upper thread is cut along the path that is the final knot point TL → the final needle drop position TC → the needle hole 44a of the feed dog 44 → the cutting position by the fixed knife 72, and the lower thread is the final knot point TL → feed. The tooth 44 is cut along a path that becomes a cutting position by the needle hole 44 a → the fixed knife 72.
(1) The distance between the final knot point TL and the final needle drop position TC is shortened by the condensation sewing pitch Pco which is the minimum pitch.
(2) The distance between the final needle drop position TC and the needle hole 44a of the feed dog 44 is close to each other and shortened by being brought close to the cutting position by the fixed knife 72 at the upper limit value Pmax which is the maximum pitch. It has become.
(3) The distance between the needle hole 44a of the feed dog 44 and the cutting position by the fixed knife 72 is close by the feed dog 44 being brought closer to the cutting position by the fixed knife 72 at the upper limit value Pmax which is the maximum pitch. It has been shortened.
(4) The distance between the final nodal point TL and the needle hole 44a of the feed dog 44 is shortened by bringing the feed dog 44 closer to the cutting position by the fixed knife 72 at the upper limit value Pmax which is the maximum pitch. .

このため、針送りを行うミシンにおいて、上糸及び下糸の切断後の残端長さを最大限に短縮化することが可能となっている。
また、最終針落ち位置TCと送り歯44は、いずれも最大ピッチである上限値Pmaxで固定メス72による切断位置側に寄せられるので、縫製中の設定縫いピッチに拘わらず、最大限にこれらを固定メス72による切断位置側に寄せることができ、縫製中の設定縫いピッチに拘わらず上糸及び下糸の切断後の残端長さを最大限に短縮化することが可能である。
For this reason, in the sewing machine that performs needle feeding, it is possible to shorten the remaining end length after cutting the upper thread and the lower thread to the maximum.
Further, since the final needle drop position TC and the feed dog 44 are both brought close to the cutting position by the fixed knife 72 at the upper limit value Pmax which is the maximum pitch, they are maximized regardless of the set sewing pitch during sewing. It is possible to approach the cutting position by the fixed knife 72, and it is possible to reduce the remaining end length after cutting the upper thread and the lower thread to the maximum regardless of the set sewing pitch during sewing.

[縫製及び糸切りの動作制御の他の例]
前述した動作例では、最終結節点の次の一針を正の送り方向のコンデンス縫いピッチPcoで送る場合を例示したが、最終結節点の次の一針を逆の送り方向のコンデンス縫いピッチPcoで送っても、上糸及び下糸の残端を短くすることは可能である。
図12及び図13はその場合の動作説明図、図14は送り歯44の位置変化を示す説明図である。以下、主に最終結節点の次の一針を正の送り方向のコンデンス縫いピッチPcoで送る場合の動作と異なる点のみを主として説明する。
[Other examples of sewing and thread trimming operation control]
In the above-described operation example, the case where the next stitch after the final knot point is fed with the condensation stitching pitch Pco in the positive feed direction is exemplified. However, the one stitch after the final knot point is fed with the condensation stitching pitch Pco in the reverse feed direction. It is possible to shorten the remaining ends of the upper thread and the lower thread even if it is fed by.
12 and 13 are explanatory diagrams of the operation in that case, and FIG. 14 is an explanatory diagram showing a change in the position of the feed dog 44. In the following, mainly the differences from the operation in the case where the one stitch next to the final knot will be fed at the condensation stitching pitch Pco in the positive feed direction will be mainly described.

以下、制御装置90による制御に基づく動作である。
糸切断の指示がペダルから入力されると上軸角度230°において、縫いピッチが逆の送り方向のコンデンス縫いピッチPcoに設定される(図12(A)[230°]参照)。これにより、まず送り歯44の位置が逆の布送り方向側に移動(図14[1]参照)するため最終結節点TLも逆送り方向に移動し、さらに最終結節点TLは送り歯44により逆の布送り方向にコンデンス縫いピッチPcoで送られる(図12(B)[240°]参照)。
そして、送り歯44が下降して布地Cから離れ(図12(C)[0°]参照)、再び、送り歯44が上昇して布地Cに接触する(図12(D)[90°]参照)。
そして、縫い針13が布地Cに突き刺さると(図12(E)[120°]参照)、最終結節点TLよりも正の布送り方向下流側にコンデンス縫いピッチPcoの最終針落ちが形成される。
さらに、縫い針13が下死点まで到達すると(図13(F)[180°]参照)、縫いピッチが正の送り方向の最大ピッチである上限値Pmax(9[mm])に設定され、固定メス72による切断位置に最も近接する位置まで最終針落ち位置TCが搬送される(図13(G)[270°]参照)。
さらに、送り歯44が下降して布地Cから離れ、上軸角度が送り歯離間位置に到達すると(図13(H)[0°]参照)、縫いピッチは逆の送り方向の最大ピッチPmax(9[mm])に切り換えられる。これにより、送り歯44は反転して固定メス72による切断位置側へ戻り、上軸角度50°において、上糸及び下糸が切断される(図13(J)[50°]参照)。
Hereinafter, the operation is based on the control by the control device 90.
When a thread cutting instruction is input from the pedal, the sewing pitch is set to the condensed sewing pitch Pco in the reverse feed direction at the upper shaft angle of 230 ° (see FIG. 12A [230 °]). As a result, the position of the feed dog 44 first moves in the direction opposite to the cloth feed direction (see FIG. 14 [1]), so that the final node TL also moves in the reverse feed direction. It is fed in the reverse cloth feed direction at the condensation stitching pitch Pco (see FIG. 12B [240 °]).
Then, the feed dog 44 descends and leaves the fabric C (see FIG. 12C [0 °]), and the feed dog 44 rises again and contacts the fabric C (FIG. 12D [90 °]). reference).
When the sewing needle 13 pierces the fabric C (see FIG. 12E [120 °]), the final needle drop of the condensation sewing pitch Pco is formed downstream of the final knot point TL in the positive cloth feed direction. .
When the sewing needle 13 reaches the bottom dead center (see FIG. 13F [180 °]), the sewing pitch is set to the upper limit value Pmax (9 [mm]) which is the maximum pitch in the positive feed direction. The final needle drop position TC is conveyed to a position closest to the cutting position by the fixed knife 72 (see FIG. 13G [270 °]).
Further, when the feed dog 44 descends and separates from the fabric C and the upper shaft angle reaches the feed dog separation position (see FIG. 13 (H) [0 °]), the sewing pitch is the maximum pitch Pmax in the reverse feed direction ( 9 [mm]). As a result, the feed dog 44 reverses and returns to the cutting position side by the fixed knife 72, and the upper thread and the lower thread are cut at the upper shaft angle of 50 ° (see FIG. 13 (J) [50 °]).

この例の場合も、(1)最終結節点TL−最終針落ち位置TCの間の距離、(2)最終針落ち位置TC−送り歯44の針穴44aの間の距離、(3)送り歯44の針穴44a−固定メス72による切断位置の間の距離、(4)最終結節点TL−送り歯44の針穴44aの間の距離は、いずれも短縮化されている。
このため、針送りを行うミシンにおいて、縫製中の設定縫いピッチに拘わらず、上糸及び下糸の切断後の残端長さを最大限に短縮化することが可能である。
Also in this example, (1) the distance between the final node TL and the final needle drop position TC, (2) the distance between the final needle drop position TC and the needle hole 44a of the feed dog 44, and (3) the feed dog 44, the distance between the needle hole 44a and the cutting position by the fixed knife 72, and (4) the distance between the final node TL and the needle hole 44a of the feed dog 44 are both shortened.
For this reason, in a sewing machine that performs needle feeding, the remaining end length after cutting of the upper thread and the lower thread can be shortened to the maximum, regardless of the set sewing pitch during sewing.

[第二実施形態]
前述したミシン1では、動メス72による糸切断位置が縫い針13の回動中心位置及び回動範囲に対して正の布送り方向における下流側に設定されている場合を例示したが、動メス72による糸切断位置を縫い針13の回動中心位置及び回動範囲に対して正の布送り方向における上流側に設定することも可能である。
図15及び図16はその場合の動作説明図、図17は送り歯44の位置変化を示す説明図である。これらにより説明を行う。
以下、図9及び図10で説明した内容と異なる点を主に説明する。
[Second Embodiment]
In the sewing machine 1 described above, the case where the thread cutting position by the moving knife 72 is set on the downstream side in the positive cloth feeding direction with respect to the rotation center position and the rotation range of the sewing needle 13 is exemplified. It is also possible to set the thread cutting position by 72 on the upstream side in the positive cloth feed direction with respect to the rotation center position and rotation range of the sewing needle 13.
FIGS. 15 and 16 are explanatory diagrams of the operation in that case, and FIG. 17 is an explanatory diagram showing a change in the position of the feed dog 44. These will be described.
Hereinafter, differences from the contents described in FIGS. 9 and 10 will be mainly described.

以下、制御装置90による制御に基づく動作である。
この例の場合も、正方向の通常送りで設定ピッチを4[mm]とした場合を例示する。
糸切断の指示がペダルから入力されると、下停止位置(上軸角度230°)において(図15(A)[230°]参照)、縫いピッチが逆の送り方向のコンデンス縫いピッチPcoに設定される(図17[1]参照)。
これにより、まず送り歯44の位置が逆の布送り方向側に移動するため最終結節点TLも逆送り方向に移動し、さらに最終結節点TLは送り歯44により逆の布送り方向にコンデンス縫いピッチPcoで送られる(図15(B)[240°]参照)。
そして、送り歯44が下降して布地Cから離れ(図15(C)[0°]参照)、再び、送り歯44が上昇して布地Cに接触する(図15(D)[90°]参照)。
そして、縫い針13が布地Cに突き刺さると(図15(E)[120°]参照)、最終結節点TLよりも正の布送り方向下流側にコンデンス縫いピッチPcoの最終針落ちが形成される。
さらに、縫い針13が下死点まで到達すると(図16(F)[180°]参照)、縫いピッチを逆の送り方向の最大ピッチである上限値Pmax(9[mm])に切り換える(図17[2]参照)。
そして、下停止位置(上軸角度230°)にて、糸切り装置70の糸切りソレノイド76が作動する(図17[3]参照)。
一方、送り歯44は最大ピッチである上限値Pmaxで逆方向に移動を行い、送り歯44が搬送可能な範囲で固定メス72による切断位置に最も近接する位置まで最終結節点の縫い目を形成する針落ちの次の最終針落ち位置TCを搬送する(図16(G)[270°]参照)。
さらに、送り歯44が下降して布地Cから離れ(図16(H)[0°]参照)、上軸角度が送り歯離間位置(0°)に到達すると(図16(H)[0°]参照)、縫いピッチが正の送り方向の最大ピッチである上限値Pmax(9[mm])に切り換えられる(図17[4]参照)。
これにより、固定メス72による切断位置から離れる方向に移動していた送り歯44は移動方向が逆転して再び固定メス72による切断位置側へ戻り始める。
そして、上軸角度50°において、糸切り装置70は上糸及び下糸を切断する(図16(J)[50°]参照)。
Hereinafter, the operation is based on the control by the control device 90.
In this example as well, a case where the set pitch is 4 [mm] in the normal feed in the forward direction is illustrated.
When a thread cutting instruction is input from the pedal, the sewing pitch is set to the condensed sewing pitch Pco in the reverse feed direction at the lower stop position (upper shaft angle 230 °) (see [230 °] in FIG. 15A). (See FIG. 17 [1]).
As a result, the position of the feed dog 44 first moves in the reverse cloth feed direction, so that the final knot point TL also moves in the reverse feed direction, and the final knot point TL is condensed by the feed dog 44 in the reverse cloth feed direction. It is sent at a pitch Pco (see FIG. 15B [240 °]).
Then, the feed dog 44 descends and leaves the fabric C (see FIG. 15C [0 °]), and the feed dog 44 rises again and contacts the fabric C (FIG. 15D [90 °]). reference).
When the sewing needle 13 pierces the fabric C (see FIG. 15E [120 °]), the final needle drop of the condensation sewing pitch Pco is formed downstream of the final knot point TL in the positive cloth feed direction. .
Further, when the sewing needle 13 reaches the bottom dead center (see FIG. 16F [180 °]), the sewing pitch is switched to the upper limit value Pmax (9 mm) which is the maximum pitch in the reverse feed direction (see FIG. 16). 17 [2]).
Then, at the lower stop position (upper shaft angle 230 °), the thread trimming solenoid 76 of the thread trimming device 70 operates (see FIG. 17 [3]).
On the other hand, the feed dog 44 moves in the reverse direction at an upper limit value Pmax that is the maximum pitch, and forms a seam at the final knot point up to a position closest to the cutting position by the fixed knife 72 within a range in which the feed dog 44 can be conveyed. The final needle drop position TC next to the needle drop is conveyed (see FIG. 16G [270 °]).
Further, the feed dog 44 descends and leaves the fabric C (see FIG. 16 (H) [0 °]), and when the upper shaft angle reaches the feed dog separation position (0 °) (FIG. 16 (H) [0 ° The sewing pitch is switched to the upper limit value Pmax (9 [mm]) which is the maximum pitch in the positive feed direction (see FIG. 17 [4]).
As a result, the feed dog 44 that has moved in the direction away from the cutting position by the fixed knife 72 reverses its moving direction and starts to return to the cutting position by the fixed knife 72 again.
Then, when the upper shaft angle is 50 °, the yarn cutting device 70 cuts the upper yarn and the lower yarn (see FIG. 16 (J) [50 °]).

この例の場合も、(1)最終結節点TL−最終針落ち位置TCの間の距離、(2)最終針落ち位置TC−送り歯44の針穴44aの間の距離、(3)送り歯44の針穴44a−固定メス72による切断位置の間の距離、(4)最終結節点TL−送り歯44の針穴44aの間の距離は、いずれも短縮化されている。
このため、針送りを行うミシンにおいて、縫製中の設定縫いピッチに拘わらず、上糸及び下糸の切断後の残端長さを最大限に短縮化することが可能である。
また、上記の例では、コンデンス縫いピッチPcoでの布地の搬送方向を逆の布送り方向としたが、このコンデンス縫いピッチPcoでの布地の搬送方向を正の布送り方向とした場合も、同様に、上糸及び下糸の切断後の残端長さを最大限に短縮化することが可能である。
Also in this example, (1) the distance between the final node TL and the final needle drop position TC, (2) the distance between the final needle drop position TC and the needle hole 44a of the feed dog 44, and (3) the feed dog 44, the distance between the needle hole 44a and the cutting position by the fixed knife 72, and (4) the distance between the final node TL and the needle hole 44a of the feed dog 44 are both shortened.
For this reason, in a sewing machine that performs needle feeding, the remaining end length after cutting of the upper thread and the lower thread can be shortened to the maximum, regardless of the set sewing pitch during sewing.
In the above example, the cloth feeding direction at the condensation sewing pitch Pco is the reverse cloth feeding direction, but the same applies when the cloth feeding direction at the condensation sewing pitch Pco is the positive cloth feeding direction. In addition, it is possible to shorten the remaining end length after cutting the upper thread and the lower thread to the maximum.

[その他]
上記実施形態では一本針ミシンを例示したが、二本針ミシンの針送りミシンである場合でも、それぞれの縫い針に対応する糸切り装置における固定メスによる糸切り位置が、いずれも縫い針に対する正の布送り方向下流側に設定されている場合には、図9及び図10若しくは図12及び図13の切断時の制御により、それぞれの縫い針に対応する縫い糸の残端長さを短縮化することが可能である。
また、同様に二本針ミシンの針送りミシンで、それぞれの縫い針に対応する糸切り装置における固定メスによる糸切り位置が、いずれも縫い針に対する正の布送り方向上流側に設定されている場合には、図14及び図15の切断時の制御により、それぞれの縫い針に対応する縫い糸の残端長さを短縮化することが可能である。
[Others]
In the above embodiment, a single-needle sewing machine has been exemplified. However, even in the case of a two-needle sewing machine, the thread trimming position by the fixed knife in the thread trimming device corresponding to each sewing needle is all relative to the sewing needle. When set to the downstream side in the positive cloth feeding direction, the remaining length of the sewing thread corresponding to each sewing needle is shortened by the control at the time of cutting shown in FIGS. 9 and 10 or 12 and 13. Is possible.
Similarly, in the needle feed sewing machine of the two-needle sewing machine, the thread trimming position by the fixed knife in the thread trimming device corresponding to each sewing needle is set upstream in the positive cloth feed direction with respect to the sewing needle. In this case, the remaining lengths of the sewing threads corresponding to the respective sewing needles can be shortened by the control at the time of cutting shown in FIGS.

[送り量調節機構の他の例]
送り調節機構は、前述の構成に限らず、例えば、図18〜図22に示す構成としても良い。
この送り調節機構は、前述した送り量変換体52、アーム部材56及びリンク部材57を備えると共に、リンク部材57に連結され、Y軸方向に沿ったレバー軸501に固定支持された送り調節腕502と、送り調節腕502が擁するピン503に係合する正送りカム504と逆送りカム505とを備える送り調節体506と、送り調節腕502及び送り調節体506を通じて送り量変換体52の回動角度を規定する送り調節ダイヤル507と、最大ピッチである上限値Pmaxとなるように送り調節体506に回動を付与する送り調節体ソレノイド508と、正送りから逆送りに切り替わるようにレバー軸501に回動を付与する逆送りソレノイド509と、コンデンス縫いピッチPcoとなるようにレバー軸501に回動を付与するコンデンスソレノイド510と、手動でレバー軸501に回動を付与して正逆の送り方向を切り換えるためのレバー514とを主に備えている。
[Other examples of feed adjustment mechanisms]
The feed adjustment mechanism is not limited to the above-described configuration, and may be configured as shown in FIGS.
The feed adjustment mechanism includes the feed amount conversion body 52, the arm member 56, and the link member 57 described above, and is connected to the link member 57 and fixedly supported by the lever shaft 501 along the Y-axis direction. A feed adjustment body 506 having a forward feed cam 504 and a reverse feed cam 505 that engage with a pin 503 held by the feed adjustment arm 502, and rotation of the feed amount conversion body 52 through the feed adjustment arm 502 and the feed adjustment body 506. A feed adjustment dial 507 that defines an angle, a feed adjustment body solenoid 508 that imparts rotation to the feed adjustment body 506 so as to have an upper limit value Pmax that is the maximum pitch, and a lever shaft 501 that switches from forward feed to reverse feed The reverse feed solenoid 509 for imparting rotation to the lever and the condensation for imparting rotation to the lever shaft 501 so that the condensation sewing pitch Pco is obtained. And solenoids 510, a manually mainly a lever 514 for switching the feeding direction of the grants rotated forward and backward to the lever shaft 501.

送り調節腕502は、レバー軸501と共に回動を行い、その回動によりY軸方向に沿った丸棒状のピン503をレバー軸501を中心として周回移動させる。
送り調節体506は、ミシンフレームによりY軸回りに回動可能に軸支されており、その上端部はリンク511を介して送り調節体ソレノイド508に連結されている。
また、送り調節体506の下部には、互いに対向し、一方に向かって互いに近接するように傾斜した形状の正送りカム504及び逆送りカム505が形成されており、図19に示すように、送り調節腕502は、そのピン503が正送りカム504に圧接するように図示しない弾性体により付勢されている。
The feed adjusting arm 502 rotates together with the lever shaft 501, and the rotation moves the round bar-like pin 503 along the Y-axis direction around the lever shaft 501.
The feed adjusting body 506 is pivotally supported by the sewing machine frame so as to be rotatable about the Y axis, and its upper end is connected to the feed adjusting body solenoid 508 via a link 511.
In addition, a forward feed cam 504 and a reverse feed cam 505 are formed in the lower part of the feed adjustment body 506 so as to face each other and to be close to each other, as shown in FIG. The feed adjusting arm 502 is urged by an elastic body (not shown) so that the pin 503 comes into pressure contact with the forward feed cam 504.

送り調節ダイヤル507は、その先端部が送り調節体506に当接してダイヤル操作により任意の角度に送り調節体506を回動させることができる。
そして、ピン503が正送りカム504に圧接した状態で、送り調節体506が回動を行うと、正送りカム504に沿ってピン503の圧接位置が変化して送り調節腕502も回動し、さらに、アーム部材56及びリンク部材57を介して送り量変換体52が回動する。正送りカム504のいずれの位置にピン503が圧接しているかによって送り量変換体52の回動角度が変化して縫いピッチを変動させことができる。つまり、送り調節ダイヤル507の回転操作により、任意に縫いピッチを調節することが可能となっている。
The feed adjustment dial 507 has a tip abutting against the feed adjustment body 506 and can rotate the feed adjustment body 506 to an arbitrary angle by a dial operation.
When the feed adjusting body 506 rotates while the pin 503 is in pressure contact with the forward feed cam 504, the pressure contact position of the pin 503 changes along the forward feed cam 504, and the feed adjustment arm 502 also rotates. Further, the feed amount conversion body 52 rotates via the arm member 56 and the link member 57. Depending on which position of the forward feed cam 504 the pin 503 is in pressure contact with, the rotation angle of the feed amount conversion body 52 changes and the sewing pitch can be changed. That is, the sewing pitch can be arbitrarily adjusted by rotating the feed adjustment dial 507.

正送りカム504と逆送りカム505とは、前述したように、互いに対向しつ、片側に向かうにつれて相互間隔が狭くなるように形成されている。そして、正送りカム504及び逆送りカム505は、相互間隔が狭くなる方にピン503が移動すると、縫いピッチが小さくなるように形成されており、さらに、正送りカム504と逆送りカム505との境界位置にピン503が位置する時に縫いピッチが0となるように形成されている。
前述した逆送りソレノイド509は、リンク512を介してレバー軸501に連結され、送り調節腕502を弾性体に抗して回動させ、図20に示すように、ピン503を逆送りカム505に圧接させることができる。
送り調節体506が回動しないように静止した状態で、ピン503が正送りカム504に圧接した状態から逆送りカム505に圧接した状態に移動すると、もとの正送りカム504との圧接位置による正送り方向の縫いピッチと、ピン503の移動後の逆送りカム505との圧接位置による逆送り方向の縫いピッチとは、ピッチ幅が一致するように、相互のカム形状が形成されている。つまり、逆送りソレノイド509に作動により、ピン503が正送りカム504に圧接した状態から逆送りカム505に圧接した状態に移動すると、縫いピッチを維持したまま送り方向のみを正逆に切り換えることが可能となっている。
なお、逆送りソレノイド509は、所定位置で調節腕502の回動が停止するように、そのストローク量を調整されている構成でも良い。即ち、逆送りソレノイド510による調節腕502の回動がアーム部材56及びリンク部材57を介して送り量変換体52を回動させ停止する位置は、逆送り方向の最大ピッチである上限値Pmaxとなるように設定された構成でも良い。
As described above, the forward feed cam 504 and the reverse feed cam 505 are formed so as to face each other and become narrower toward each other. The forward feed cam 504 and the reverse feed cam 505 are formed so that the sewing pitch decreases when the pin 503 moves in a direction where the mutual interval becomes narrower. Further, the forward feed cam 504 and the reverse feed cam 505 The sewing pitch is 0 when the pin 503 is located at the boundary position.
The aforementioned reverse feed solenoid 509 is connected to the lever shaft 501 via the link 512, and rotates the feed adjustment arm 502 against the elastic body, so that the pin 503 is connected to the reverse feed cam 505 as shown in FIG. Can be pressed.
When the feed adjuster 506 is stationary so as not to rotate, and the pin 503 moves from a state where it is pressed against the forward feed cam 504 to a state where it is pressed against the reverse feed cam 505, the pressure contact position with the original forward feed cam 504 The sewing pitch in the forward feed direction due to the above and the sewing pitch in the reverse feed direction due to the pressure contact position with the reverse feed cam 505 after the movement of the pin 503 are formed in a mutual cam shape so that the pitch widths coincide with each other. . In other words, when the pin 503 moves from a state where it is pressed against the forward feed cam 504 to a state where it is pressed against the reverse feed cam 505 by operating the reverse feed solenoid 509, only the feed direction can be switched between forward and reverse while maintaining the sewing pitch. It is possible.
The reverse feed solenoid 509 may have a configuration in which the stroke amount is adjusted so that the rotation of the adjustment arm 502 stops at a predetermined position. That is, the position where the rotation of the adjustment arm 502 by the reverse feed solenoid 510 rotates and stops the feed amount converter 52 via the arm member 56 and the link member 57 is the upper limit value Pmax which is the maximum pitch in the reverse feed direction. The configuration may be set so as to be.

コンデンスソレノイド510は、リンク513を介してレバー軸501に連結され、送り調節腕502を弾性体に抗して回動させる。このコンデンスソレノイド510は、所定位置で調節腕502の回動が停止するように、そのストロークが調整されている。即ち、コンデンスソレノイド510による調節腕502の回動がアーム部材56及びリンク部材57を介して送り量変換体52を回動して停止する位置は、図21に示すように、前述した正送り又は逆送り方向のコンデンス縫いピッチPcoになるように設定されている。   The condensation solenoid 510 is connected to the lever shaft 501 via the link 513 and rotates the feed adjusting arm 502 against the elastic body. The stroke of the condensation solenoid 510 is adjusted so that the rotation of the adjustment arm 502 stops at a predetermined position. That is, the position at which the rotation of the adjustment arm 502 by the condensation solenoid 510 rotates and stops the feed amount conversion body 52 via the arm member 56 and the link member 57 is the above-described normal feed or The condensation sewing pitch Pco in the reverse feed direction is set.

送り調節体ソレノイド508は、リンク511を介して送り調節体506に連結され、当該送り調節体506を回動させることで、図22に示すように、正送りカム504に圧接しているピン503を正送りの最大ピッチである上限値Pmaxとなる位置まで相対的に移動させる。   The feed adjusting body solenoid 508 is connected to the feed adjusting body 506 via the link 511, and by rotating the feed adjusting body 506, as shown in FIG. Are relatively moved to a position where the maximum pitch P is the upper limit value Pmax.

これらの構成により、図22の送り調節機構は、図11,14,17に示すミシンの糸切り実行時のいずれの動作も実行することが可能である。
例えば、図11の動作において、予め送り調節ダイヤル507により設定された通常の縫製の縫いピッチからコンデンス縫いピッチPcoに切り換える際には、送り調節体ソレノイド508、逆送りソレノイド509、コンデンスソレノイド510がいずれも停止して推力0の状態(図19の状態)からコンデンスソレノイド510のみが作動し、図21の状態に切り替えを行う。
さらに、図11の動作において、縫いピッチを正送りの最大ピッチとしての上限値Pmaxに切り換える際には、コンデンスソレノイド510及び逆送りソレノイド509をOFF状態、送り調節体ソレノイド508をON状態にして、図22の状態に切り換える。
さらに、図11の動作において、縫いピッチを逆送りの最大ピッチとしての上限値Pmaxに切り換える際には、コンデンスソレノイド510をOFF状態、送り調節体ソレノイド508及び逆送りソレノイド509をON状態として、図20の状態に切り換える。(逆送りソレノイド509のストローク量を逆送りの最大ピッチとしての上限値Pmaxとなるように予め設定している場合は、逆送りソレノイド509をON状態、コンデンスソレノイド510及び送り調節体ソレノイド510をOFF状態とする)
With these configurations, the feed adjusting mechanism shown in FIG. 22 can execute any operation during the thread trimming of the sewing machine shown in FIGS.
For example, in the operation of FIG. 11, when switching from the normal sewing pitch preset by the feed adjustment dial 507 to the condensation sewing pitch Pco, the feed adjustment solenoid 508, the reverse feed solenoid 509, and the condensation solenoid 510 are Then, only the condensation solenoid 510 is operated from the state of zero thrust (the state of FIG. 19), and the state is switched to the state of FIG.
Further, in the operation of FIG. 11, when the sewing pitch is switched to the upper limit value Pmax as the maximum forward feed pitch, the condensation solenoid 510 and the reverse feed solenoid 509 are turned off, and the feed adjustment solenoid 508 is turned on. Switch to the state of FIG.
Further, in the operation of FIG. 11, when the sewing pitch is switched to the upper limit value Pmax as the maximum reverse feed pitch, the condensation solenoid 510 is turned off, the feed adjustment solenoid 508 and the reverse feed solenoid 509 are turned on. Switch to 20 state. (When the stroke amount of the reverse feed solenoid 509 is set in advance so as to be the upper limit value Pmax as the maximum reverse feed pitch, the reverse feed solenoid 509 is in the ON state, and the condensation solenoid 510 and the feed adjusting solenoid 510 are turned off. State)

また、図14の動作を実行する場合には、コンデンスソレノイド510によるピン503の停止位置が逆送り方向のコンデンス縫いピッチPcoになるように設計する必要がある。
この場合において、予め送り調節ダイヤル507により設定された通常の縫製の縫いピッチから逆送りのコンデンス縫いピッチPcoに切り換える際には、送り調節体ソレノイド508、逆送りソレノイド509、コンデンスソレノイド510がいずれも停止して推力0の状態(図19の状態)からコンデンスソレノイド510のみが作動し、逆送り方向のコンデンス縫いピッチPcoとなる所定位置に切り替えを行う。
さらに、図14の動作において、縫いピッチを正送りの最大ピッチとしての上限値Pmaxに切り換える際には、コンデンスソレノイド510及び逆送りソレノイド509をOFF状態、送り調節体ソレノイド508をON状態にして、図22の状態に切り換える。
さらに、図14の動作において、縫いピッチを逆送りの最大ピッチとしての上限値Pmaxに切り換える際には、コンデンスソレノイド510をOFF状態、送り調節体ソレノイド508及び逆送りソレノイド509をON状態として、図20の状態に切り換える。(逆送りソレノイド509のストローク量を逆送りの最大ピッチとしての上限値Pmaxとなるように予め設定している場合は、逆送りソレノイド509をON状態、コンデンスソレノイド510及び送り調節体ソレノイド508をOFF状態とする)
Further, when the operation of FIG. 14 is executed, it is necessary to design the stop position of the pin 503 by the condensation solenoid 510 to be the condensation sewing pitch Pco in the reverse feed direction.
In this case, when switching from the normal sewing pitch preset by the feed adjustment dial 507 to the reverse feed condensation sewing pitch Pco, the feed adjustment solenoid 508, the reverse feed solenoid 509, and the condensation solenoid 510 are all used. Only the condensation solenoid 510 is operated from the state where the thrust is zero and the thrust is zero (the state shown in FIG. 19), and the position is switched to a predetermined position where the condensation sewing pitch Pco in the reverse feed direction is obtained.
Further, in the operation of FIG. 14, when the sewing pitch is switched to the upper limit value Pmax as the maximum forward feed pitch, the condensation solenoid 510 and the reverse feed solenoid 509 are turned off, and the feed adjustment solenoid 508 is turned on. Switch to the state of FIG.
Further, in the operation of FIG. 14, when the sewing pitch is switched to the upper limit value Pmax as the maximum reverse feed pitch, the condensation solenoid 510 is turned off, the feed adjustment solenoid 508 and the reverse feed solenoid 509 are turned on. Switch to 20 state. (When the stroke amount of the reverse feed solenoid 509 is set in advance so as to be the upper limit value Pmax as the maximum reverse feed pitch, the reverse feed solenoid 509 is in the ON state, and the condensation solenoid 510 and the feed adjusting body solenoid 508 are turned off. State)

また、図17の動作を実行する場合も、コンデンスソレノイド510によるピン503の停止位置が逆送り方向のコンデンス縫いピッチPcoになるように設計する必要がある。
この場合において、予め送り調節ダイヤル507により設定された通常の縫製の縫いピッチから逆送りのコンデンス縫いピッチPcoに切り換える際には、送り調節体ソレノイド508、逆送りソレノイド509、コンデンスソレノイド510がいずれも停止して推力0の状態(図19の状態)からコンデンスソレノイド510のみが作動し、逆送り方向のコンデンス縫いピッチPcoとなる所定位置に切り替えを行う。
さらに、図17の動作において、縫いピッチを逆送りの最大ピッチとしての上限値Pmaxに切り換える際には、コンデンスソレノイド510をOFF状態、送り調節体ソレノイド508及び逆送りソレノイド509をON状態として、図20の状態に切り換える。(逆送りソレノイド509のストローク量を逆送りの最大ピッチとしての上限値Pmaxとなるように予め設定している場合は、逆送りソレノイド509をON状態、コンデンスソレノイド510及び送り調節体ソレノイド508をOFF状態とする)
さらに、図17の動作において、縫いピッチを正送りの最大ピッチとしての上限値Pmaxに切り換える際には、コンデンスソレノイド510及び逆送りソレノイド509をOFF状態、送り調節体ソレノイド508をON状態にして、図22の状態に切り換える。
Also, when the operation of FIG. 17 is executed, it is necessary to design the stop position of the pin 503 by the condensation solenoid 510 to be the condensation sewing pitch Pco in the reverse feed direction.
In this case, when switching from the normal sewing pitch preset by the feed adjustment dial 507 to the reverse feed condensation sewing pitch Pco, the feed adjustment solenoid 508, the reverse feed solenoid 509, and the condensation solenoid 510 are all used. Only the condensation solenoid 510 is operated from the state where the thrust is zero and the thrust is zero (the state shown in FIG. 19), and the position is switched to a predetermined position where the condensation sewing pitch Pco in the reverse feed direction is obtained.
Further, in the operation of FIG. 17, when the sewing pitch is switched to the upper limit value Pmax as the maximum reverse feed pitch, the condensation solenoid 510 is turned off, the feed adjustment solenoid 508 and the reverse feed solenoid 509 are turned on, Switch to 20 state. (When the stroke amount of the reverse feed solenoid 509 is set in advance so as to be the upper limit value Pmax as the maximum reverse feed pitch, the reverse feed solenoid 509 is in the ON state, and the condensation solenoid 510 and the feed adjusting body solenoid 508 are turned off. State)
Further, in the operation of FIG. 17, when switching the sewing pitch to the upper limit value Pmax as the maximum forward feed pitch, the condensation solenoid 510 and the reverse feed solenoid 509 are turned off, and the feed adjustment solenoid 508 is turned on. Switch to the state of FIG.

このように、図18に示す送り調節機構は、コンデンスソレノイド510により停止位置の設計変更の必要はあるが、図11,14,17のいずれの動作も実行することが可能である。
なお、図18では、送り調節機構の各ソレノイド508,509,510はいずれもロータリーソレノイドを図示しているが、これに限らず、各リンク511,512,513の長手方向に進退動作可能な直動式のソレノイドを使用することも可能である。
As described above, the feed adjusting mechanism shown in FIG. 18 needs to change the design of the stop position by the condensation solenoid 510, but can execute any of the operations shown in FIGS.
In FIG. 18, each of the solenoids 508, 509, 510 of the feed adjustment mechanism is a rotary solenoid. However, the present invention is not limited to this, and the solenoids 508, 509, 510 can be moved forward and backward in the longitudinal direction of the links 511, 512, 513. It is also possible to use a dynamic solenoid.

1 針送りミシン
2 ミシンフレーム
4 調節モーター
9 上軸
12 針棒
13 縫い針
14 針送り機構
17 針板
30 布送り機構
44 送り歯
44a 針穴
51 送り量調節機構
52 送り量変換体
60 ミシンモーター
70 糸切り装置
71 動メス
72 固定メス
80 釜機構
90 制御装置
F 縫製方向
DESCRIPTION OF SYMBOLS 1 Needle feed sewing machine 2 Sewing machine frame 4 Adjustment motor 9 Upper shaft 12 Needle bar 13 Sewing needle 14 Needle feed mechanism 17 Needle plate 30 Cloth feed mechanism 44 Feed dog 44a Needle hole 51 Feed amount adjustment mechanism 52 Feed amount conversion body 60 Sewing motor 70 Thread trimmer 71 Moving knife 72 Fixed knife 80 Hook mechanism 90 Controller F Sewing direction

Claims (2)

ミシンモーターにより回転駆動される上軸と、
前記上軸の回転に同期して針棒を上下動させる針棒上下動機構と、
前記上軸の回転に同期して布送り方向に沿って前記針棒を揺動させる針送り機構と、
前記上軸の回転に同期して、針穴が形成された送り歯を前記布送り方向に沿った長円の軌跡で周回させて被縫製物を送る布送り機構と、
前記針棒に支持された縫い針よりも正の布送り方向下流側で上糸及び下糸の切断を行う糸切り装置と、
縫いピッチを調節する送り量調節機構と、
前記糸切り装置と前記送り量調節機構の動作制御を行う制御装置とを備え、
前記縫い針が下降して被縫製物に突き通された状態で前記送り歯による布送りを行うミシンにおいて、
前記制御装置は、
最終結節点の縫い目を形成する縫い針が被縫製物に刺さっている状態で送りピッチを正又は逆の布送り方向に前記送り量調節機構により調節可能な最小ピッチとして前記被縫製物の送りを行い、さらに、前記最終結節点の次の針落ちを行った縫い針が被縫製物に刺さっている状態で送りピッチを正の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記被縫製物の送りを行い、
前記最大ピッチで送りを行った前記送り歯が前記被縫製物から離れてから糸切りを行うまでの間、送りピッチを逆の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記送り歯を移動させるように、前記送り量調節機構を制御することを特徴とするミシン。
An upper shaft that is rotationally driven by a sewing machine motor;
A needle bar vertical movement mechanism that moves the needle bar up and down in synchronization with the rotation of the upper shaft;
A needle feed mechanism that swings the needle bar along the cloth feed direction in synchronization with the rotation of the upper shaft;
Synchronously with the rotation of the upper shaft, a cloth feed mechanism for feeding the workpiece by rotating the feed dog in which the needle hole is formed in an elliptical locus along the cloth feed direction;
A thread trimming device for cutting the upper thread and the lower thread on the downstream side in the positive cloth feed direction with respect to the sewing needle supported by the needle bar;
A feed amount adjusting mechanism for adjusting the sewing pitch;
A control device for controlling the operation of the thread trimming device and the feed amount adjusting mechanism;
In the sewing machine that feeds the cloth by the feed dog in a state where the sewing needle is lowered and pierced by the workpiece,
The control device includes:
With the sewing needle forming the seam of the final knot point stuck in the workpiece, the feed pitch is set to the minimum pitch that can be adjusted by the feed amount adjusting mechanism in the forward or reverse cloth feed direction. Further, the feed pitch is set as the maximum pitch that can be adjusted by the feed amount adjustment mechanism in the positive cloth feed direction in a state in which the sewing needle that has made the needle drop next to the final knot is stuck in the workpiece. Feed the workpiece,
The feed pitch is set to the maximum pitch that can be adjusted by the feed amount adjusting mechanism in the reverse cloth feed direction until the feed dog that has been fed at the maximum pitch is separated from the sewing product until thread trimming is performed. A sewing machine that controls the feed amount adjusting mechanism so as to move the feed dog.
ミシンモーターにより回転駆動される上軸と、
前記上軸の回転に同期して針棒を上下動させる針棒上下動機構と、
前記上軸の回転に同期して布送り方向に沿って前記針棒を揺動させる針送り機構と、
前記上軸の回転に同期して、針穴が形成された送り歯を前記布送り方向に沿った長円の軌跡で周回させて被縫製物を送る布送り機構と、
前記針棒に支持された縫い針よりも正の布送り方向上流側で上糸及び下糸の切断を行う糸切り装置と、
縫いピッチを調節する送り量調節機構と、
前記糸切り装置と前記送り量調節機構の動作制御を行う制御装置とを備え、
前記縫い針が下降して被縫製物に突き通された状態で前記送り歯による布送りを行うミシンにおいて、
前記制御装置は、
最終結節点の縫い目を形成する縫い針が被縫製物に刺さっている状態で送りピッチを正又は逆の布送り方向に前記送り量調節機構により調節可能な最小ピッチとして前記被縫製物の送りを行い、さらに、前記最終結節点の次の針落ちを行った縫い針が被縫製物に刺さっている状態で送りピッチを逆の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記被縫製物の送りを行い、
前記最大ピッチで送りを行った前記送り歯が前記被縫製物から離れてから糸切りを行うまでの間、送りピッチを正の布送り方向に前記送り量調節機構により調節可能な最大ピッチとして前記送り歯を移動させるように、前記送り量調節機構を制御することを特徴とするミシン。
An upper shaft that is rotationally driven by a sewing machine motor;
A needle bar vertical movement mechanism that moves the needle bar up and down in synchronization with the rotation of the upper shaft;
A needle feed mechanism that swings the needle bar along the cloth feed direction in synchronization with the rotation of the upper shaft;
Synchronously with the rotation of the upper shaft, a cloth feed mechanism for feeding the workpiece by rotating the feed dog in which the needle hole is formed in an elliptical locus along the cloth feed direction;
A thread trimming device that cuts the upper thread and the lower thread upstream of the sewing needle supported by the needle bar in the positive cloth feed direction;
A feed amount adjusting mechanism for adjusting the sewing pitch;
A control device for controlling the operation of the thread trimming device and the feed amount adjusting mechanism;
In the sewing machine that feeds the cloth by the feed dog in a state where the sewing needle is lowered and pierced by the workpiece,
The control device includes:
With the sewing needle forming the seam of the final knot point stuck in the workpiece, the feed pitch is set to the minimum pitch that can be adjusted by the feed amount adjusting mechanism in the forward or reverse cloth feed direction. In addition, the feed pitch is set to the maximum pitch that can be adjusted by the feed amount adjusting mechanism in the reverse cloth feed direction in a state where the sewing needle that has made the needle drop next to the final knot is stuck in the workpiece. Feed the workpiece,
The feed pitch is set to the maximum pitch that can be adjusted by the feed amount adjusting mechanism in the positive cloth feed direction until the feed dog that has been fed at the maximum pitch is separated from the sewing product until thread trimming is performed. A sewing machine that controls the feed amount adjusting mechanism so as to move the feed dog.
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