JP3866970B2

JP3866970B2 - Lockstitch machine with cloth edge cutting device

Info

Publication number: JP3866970B2
Application number: JP2001388440A
Authority: JP
Inventors: 英夫麻生; 修宏西
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2001-12-20
Filing date: 2001-12-20
Publication date: 2007-01-10
Anticipated expiration: 2021-12-20
Also published as: JP2003181178A

Description

【０００１】
【発明の属する技術分野】
本発明は、針駆動機構により、一軸線に沿って上下動すると共に、作業者から見て右方にエグリ部が配置された一本の針と、該一本の針の針落ち位置の左側に配設されて前記針に形成された針糸ループを捕捉する釜剣先を有する一個の水平釜と、該一個の水平釜の近傍に配設されて縫製動作に連動して布端を動メスと固定メスとの協働により順次裁断する布端裁断装置とを備えた布端裁断装置付本縫ミシンに係り、詳しくは、縫製能力および縫製品質を向上させるための改良に関するものである。
【０００２】
【従来の技術】
図３は、従来の布端裁断装置付本縫ミシンにおける針と釜と布端裁断装置との標準的な配置例を示したものである。
針１は、作業者側から見て左方にエグリ部１ａを向けた姿勢で、図示せぬ針棒の先端に装着されている。なお、ミシンフレーム３に収容された布送り装置による布送り方向は、図中に示した矢印Ａ方向である。
【０００３】
そして、釜４は、作業者側から見て、針１の針落ち位置を通る布送り方向線Ｌの左側に配設されており、上方から見て時計方向（図中の矢印Ｂ方向）に水平回転される水平釜である。そして、この水平釜４は、釜剣先４ａを布送り方向Ａに逆行する向きで針１の左側に進入させて、針１の左側で縫い糸６の針糸ループ６ａを捕捉する。
【０００４】
布端裁断装置８は、縫製動作に同期作動して上下に進退駆動される動メス８ａと、該動メス８ａの下方に固定装備された固定メス８ｂとの協働により布端を順次裁断するもので、針落ち位置の右側で前記水平釜４に接近して配置されている。
【０００５】
【発明が解決しようとする課題】
ところが、前述した従来の布端裁断装置付本縫ミシンでは、縫い糸６に一般的なＺ撚り糸を使用した場合に、釜剣先４ａや針１の針穴エッジが糸の撚り方向と逆向きに糸の表面を擦る（しごく）結果、縫い糸６に撚りの戻りが発生し易く、この撚りの戻りに起因して、糸切れや糸目の乱れ等の縫製不良が発生することがあった。
【０００６】
そこで、このような不都合を解決するため、これまで、図４や図５に示す構成の布端裁断装置付本縫ミシンが提案されている。
【０００７】
図４に示した布端裁断装置付本縫ミシンは、針１のエグリ部１ａを作業者側から見て右側に向けて配置している。
また、釜９には鉛直面内で回転する垂直釜を採用し、釜剣先９ａを布送り方向Ａに沿った向きで針１の右側に進入させて、針１の右側で縫い糸６の針糸ループ６ａを捕捉するようにしている。
【０００８】
図５に示した布端裁断装置付本縫ミシンは、針１のエグリ部１ａを作業者側から見て右側に向けて配置している。
また、上方から見て時計方向に回転駆動される水平釜４を、針１の針落ち位置を通る布送り方向線Ｌの右側に配設することで、釜剣先４ａを布送り方向Ａに沿う向きで針１の右側に進入させて、針１の右側で縫い糸６の針糸ループ６ａを捕捉するようにしている。
【０００９】
これらの図４および図５に示した針と釜の配置では、縫い糸６に一般的なＺ撚り糸を使用しても、釜剣先４ａ，９ａや針１の針穴エッジが糸の撚り方向に沿って糸の表面を擦る構造のため、縫い糸６に撚りの戻りが発生しない。
従って、糸の撚りの戻りに起因する縫製不良の発生を防止することができる。
【００１０】
しかし、図４および図５に示した針と釜の配置では、図示のように、針落ち位置の右側のスペースが、釜や釜の駆動軸によって占有されてしまうため、布端裁断装置８を図３に示したように針落ち位置のすぐ右側に接近した位置に配置することができない。
従って、図示のように、布端裁断装置８が釜等と干渉しないように、針１の針落ち位置から布送り方向Ａに沿って適宜距離だけ離れた位置に布端裁断装置８を配置している。
【００１１】
ところが、このように、布端裁断装置８を針落ち位置から遠くに離すと、布が布端裁断装置８によって端部を裁断されてから針落ち位置まで送られるまでに、布が布送り方向Ａと直交する方向に位置ずれを起こし易い。
このような布端の位置ずれは、生地厚が厚い素材や、布端の裁断が曲線になる場合に顕著になり、縫製後の布端から縫い目までの仕上がり幅が不均一になる縫製不良を招くため、縫製品質を確保するためには、生地厚が制限されたり、裁断形状が制限される等の問題が生じた。
【００１２】
本発明は、前述した問題点に鑑みてなされたものであり、その目的は、縫い糸の撚りの戻りに起因する縫製不良の発生を防止でき、また、縫製素材の生地厚が厚い場合や布端を曲線状に裁断する場合でも、布端裁断装置による布の裁断位置から縫製位置まで移動する際に布の位置ずれを防止して、縫製後の布端から縫い目までの仕上がり幅が均一な高品位な縫製を実現するとともに、生地厚や裁断形状等の処理能力を向上させることができる布端裁断装置付本縫ミシンを提供することにある。
【００１３】
【課題を解決するための手段】
上記目的を達成するために、本発明に係る布端裁断装置付本縫ミシンは、請求項１に記載したように、針駆動機構により、一軸線に沿って上下動すると共に、作業者から見て右方にエグリ部が配置された一本の針と、該一本の針の針落ち位置の左側に配設されて前記針に形成された針糸ループを捕捉する釜剣先を有する一個の水平釜と、該一個の水平釜の近傍に配設されて縫製動作に同期作動して布端を動メスと固定メスとの協働により順次裁断する布端裁断装置と、を備えた布端裁断装置付本縫ミシンにおいて、前記一個の水平釜の回転方向を反時計方向に設定し、且つ、前記一個の水平釜の釜剣先や前記一本の針の針穴エッジが前記針糸の撚り方向と逆向きに該針糸の表面を擦ることによって発生する前記針糸の撚り戻りを防止するべく、前記一個の水平釜の釜剣先を布送り方向に沿って前記一本の針の右側に進入させて該一本の針の右側で前記針糸ループを捕捉させるとともに、布の裁断位置から縫製位置までの移動距離が小さくなるように、前記布端裁断装置を前記一個の水平釜に対向して前記針落ち位置の右側で、且つ、該針落ち位置に接近した位置に配設したことを特徴とする。
【００１４】
このように構成された布端裁断装置付本縫ミシンにおいては、縫い糸に一般的なＺ撚り糸を使用しても、釜剣先や針の針穴エッジが糸の撚り方向に沿って糸の表面を擦る構造のため、縫い糸に撚りの戻りが発生しない。
従って、糸の撚りの戻りに起因する縫製不良の発生を防止することができ、針の右側の針糸ループを捕捉するため、縫い目を正確なパーフェクトステッチに形成することができる。
【００１５】
更に、針落ち位置の右側のスペースが空きスペースとなるため、針落ち位置の右側で針落ち位置に極力接近させた位置に布端裁断装置を配置することができ、このように針落ち位置に極力接近させ布端裁断装置を配置することで、布の裁断位置から縫製位置までの移動距離を最小限にすることができる。
すなわち、布が裁断されてから針落ち位置まで送られるまでの布送り量を最短に抑えることで、布送り動作時の布送り方向と直交する方向への布の位置ずれを防止することができる。
【００１６】
従って、縫製素材の生地厚が厚い場合や布端を曲線状に裁断する場合でも、布端裁断装置による布の裁断位置から縫製位置まで移動する際に布の布送り方向と直交する方向への位置ずれを防止することができ、縫製後の布端から縫い目までの仕上がり幅が均一な高品位な縫製を実現するとともに、生地厚や裁断形状等の処理能力を向上させることができる。
【００１７】
【発明の実施の形態】
以下、本発明に係る布端裁断装置付本縫ミシンの実施形態を図面に基づいて詳細に説明する。
なお、以下の実施形態の説明において、「左右」、「右側」、「左側」はミシンを操作する作業者の位置から見たときの左右、右側、左側を意味している。
また、釜の回転方向を示す「時計方向」、「反時計方向」は、ミシンの上面側から見たときに時計方向、反時計方向となることを意味している。
【００１８】
図１は、本発明に係る布端裁断装置付本縫ミシンの第１実施形態における針と釜と布端裁断装置との配置例を示した斜視図である。
この第１実施形態において、針１は、作業者側から見て右方にエグリ部１ａを向けた姿勢で図示せぬ針棒の先端に装着されていて、針駆動機構により、矢印Ｄ方向に上下動される。
なお、ミシンフレーム１３に収容された布送り装置による布送り方向は、図中に示した矢印Ａ方向である。
【００１９】
そして、釜１４は、作業者側から見て、針１の針落ち位置を通る布送り方向線Ｌの左側に配設されており、上方から見て反時計方向（図中の矢印Ｅ方向）に水平回転される水平釜１４である。
そして、この水平釜１４は、釜剣先１４ａを布送り方向Ａに沿う向きで針１の右側に進入させて、針１の右側で縫い糸６の針糸ループ６ａを捕捉する。
【００２０】
布端裁断装置８は、針１の縫製動作に同期作動して上下に進退駆動される動メス８ａと、該動メス８ａの下方に固定装備された固定メス８ｂとの協働により布端を順次裁断するもので、上記の針落ち位置を通る布送り方向線Ｌの右側で、針落ち位置に極めて近接した位置に配置されている。
【００２１】
以上の構成の布端裁断装置付本縫ミシンでは、縫い糸６に一般的なＺ撚り糸を使用しても、釜剣先１４ａや針１の針穴エッジが糸の撚り方向に沿って糸６の表面を擦る構造のため、縫い糸６に撚りの戻りが発生しない。従って、糸の撚りの戻りに起因する縫製不良の発生を防止することができる。
水平釜１４は、捕捉する針糸ループが針１の右側の針糸ループ６ａで、所謂、釜から遠ざかる側に位置する針糸ループを捕捉する外すくい釜で、縫い目を正確なパーフェクトステッチに形成することができる。
【００２２】
更に、釜１４や釜１４の駆動軸が針落ち位置を通る布送り方向線Ｌの左側に収まっていて、針落ち位置の右側のスペースが空きスペースとなるため、図示のように、針落ち位置の右側で針落ち位置に極力接近させた位置に布端裁断装置８を配置することができる。
そして、このように針落ち位置に極力接近させ布端裁断装置８を配置することで、布の裁断位置から縫製位置までの移動距離を最小限にすることができる。
すなわち、布が裁断されてから針落ち位置まで送られるまでの布送り量を最短に抑えることで、布送り動作時の布送り方向と直交する方向への布の位置ずれを防止することができる。
【００２３】
従って、縫製素材の生地厚が厚い場合や布端を曲線状に裁断する場合でも、布端裁断装置８による布の裁断位置から縫製位置まで移動する際に布の布送り方向と直交する方向への位置ずれを防止することができ、縫製後の布端から縫い目までの仕上がり幅が均一な高品位な縫製を実現するとともに、生地厚や裁断形状等の処理能力を向上させることができる。
【００２４】
図２は、本発明に係る布端裁断装置付本縫ミシンの第２実施形態における針と釜と布端裁断装置との配置例を示した斜視図である。
この第２実施形態は、第１実施形態の一部を改善したもので、具体的には、布端裁断装置８の代わりに、布端裁断装置１８を使用したものであり、それ以外の構成は第１実施形態のものと共通である。共通の構成については、同番号を付して説明を省略する。
【００２５】
この布端裁断装置１８は、針１の縫製動作に同期作動して矢印Ｆ方向に揺動する鎌型の動メス１８ａと、この動メス１８ａに対峙して固定装備された固定メス１８ｂとの協働で、縫製する布を裁断するものである。
布端裁断装置１８の装備位置は、第１実施形態の場合と同様で、上記の針落ち位置を通る布送り方向線Ｌの右側で、針落ち位置に極めて近接した位置である。
【００２６】
以上の第２実施形態においても、第１実施形態の場合と同様に、縫い糸６の撚りの戻りを防止して、撚りの戻りに起因する縫製不良の発生を防止でき、また、縫製素材の生地厚が厚い場合や布端を曲線状に裁断する場合でも、布端裁断装置１８による布の裁断位置から縫製位置まで移動する際に布の位置ずれを防止して、縫製後の布端から縫い目までの仕上がり幅が均一な高品位な縫製を実現するとともに、生地厚や裁断形状等の処理能力を向上させることができる。
【００２７】
【発明の効果】
以上に説明したように、請求項１に記載した本発明の布端裁断装置付本縫ミシンによれば、縫い糸に一般的なＺ撚り糸を使用しても、釜剣先や針の針穴エッジが糸の撚り方向に沿って糸の表面を擦る構造のため、縫い糸に撚りの戻りが発生しない。従って、糸の撚りの戻りに起因する縫製不良の発生を防止することができ、針の右側の針糸ループを捕捉するため、縫い目を正確なパーフェクトステッチに形成することができる。
【００２８】
更に、針落ち位置の右側のスペースが空きスペースとなるため、針落ち位置の右側で針落ち位置に極力接近させた位置に布端裁断装置を配置することができ、このように針落ち位置に極力接近させ布端裁断装置を配置することで、布の裁断位置から縫製位置までの移動距離を最小限にすることができる。
すなわち、布が裁断されてから針落ち位置まで送られるまでの布送り量を最短に抑えることで、布送り動作時の布送り方向と直交する方向への布の位置ずれを防止することができる。
【００２９】
従って、縫製素材の生地厚が厚い場合や布端を曲線状に裁断する場合でも、布端裁断装置による布の裁断位置から縫製位置まで移動する際に布の布送り方向と直交する方向への位置ずれを防止することができ、縫製後の布端から縫い目までの仕上がり幅が均一な高品位な縫製を実現するとともに、生地厚や裁断形状等の処理能力を向上させることができる。
【図面の簡単な説明】
【図１】本発明に係る布端裁断装置付本縫ミシンの第１実施形態の針と釜と布端裁断装置の配置を示す要部斜視図である。
【図２】本発明に係る布端裁断装置付本縫ミシンの第２実施形態の針と釜と布端裁断装置の配置を示す要部斜視図である。
【図３】従来の布端裁断装置付本縫ミシンの針と釜と布端裁断装置の配置を示す要部斜視図である。
【図４】従来の別の布端裁断装置付本縫ミシンの針と釜と布端裁断装置の配置を示す要部斜視図である。
【図５】従来の更に別の布端裁断装置付本縫ミシンの針と釜と布端裁断装置の配置を示す要部斜視図である。
【符号の説明】
１針
６縫い糸
６ａ針糸ループ
８布端裁断装置
８ａ動メス
８ｂ固定メス
１３ミシンフレーム
１４水平釜
１４ａ釜剣先
１８布端裁断装置
１８ａ動メス
１８ｂ固定メス
Ｌ針落ち位置を通る布送り方向線[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a needle driving mechanism moves up and down along one axis, and a left side of a needle drop position of the one needle, in which an edge portion is arranged on the right side when viewed from the operator. A horizontal hook having a hook point that catches the needle thread loop formed on the needle, and a cloth knife that is arranged in the vicinity of the horizontal hook and interlocks with the sewing operation. In particular, the present invention relates to an improvement for improving sewing capacity and quality of a sewing product.
[0002]
[Prior art]
FIG. 3 shows a standard arrangement example of a needle, a shuttle, and a cloth edge cutting device in a conventional sewing machine with a cloth edge cutting device.
The needle 1 is attached to the tip of a needle bar (not shown) in a posture in which the edge portion 1a is directed to the left as viewed from the operator side. In addition, the cloth feeding direction by the cloth feeding device accommodated in the sewing machine frame 3 is an arrow A direction shown in the drawing.
[0003]
The hook 4 is disposed on the left side of the cloth feed direction line L passing through the needle drop position of the needle 1 when viewed from the operator side, and clockwise when viewed from above (in the direction of arrow B in the figure). It is a horizontal hook that rotates horizontally. The horizontal hook 4 causes the hook sword tip 4 a to enter the left side of the needle 1 in a direction reverse to the cloth feeding direction A, and captures the needle thread loop 6 a of the sewing thread 6 on the left side of the needle 1.
[0004]
The cloth edge cutting device 8 sequentially cuts the cloth edge by the cooperation of a moving knife 8a that is driven to move up and down in synchronization with a sewing operation and a fixed knife 8b that is fixedly installed below the moving knife 8a. It is arranged close to the horizontal hook 4 on the right side of the needle drop position.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional sewing machine with a cloth edge cutting device, when a general Z twist thread is used as the sewing thread 6, the hook edge of the hook sword 4a and the needle hole edge of the needle 1 are in the direction opposite to the twist direction of the thread. As a result of the rubbing of the surface of the sewing thread 6, the thread 6 is likely to be twisted back, which may cause sewing defects such as thread breakage or thread disturbance.
[0006]
Therefore, in order to solve such an inconvenience, a sewing machine with a cloth edge cutting device having a configuration shown in FIGS. 4 and 5 has been proposed so far.
[0007]
In the main sewing machine with a cloth edge cutting device shown in FIG. 4, the edge portion 1a of the needle 1 is arranged on the right side when viewed from the operator side.
Further, the hook 9 employs a vertical hook that rotates in a vertical plane, and the hook sword tip 9 a is made to enter the right side of the needle 1 in the direction along the cloth feeding direction A, and the needle thread of the sewing thread 6 on the right side of the needle 1. The loop 6a is captured.
[0008]
The main sewing machine with a cloth edge cutting device shown in FIG. 5 is arranged with the edge portion 1a of the needle 1 facing rightward when viewed from the operator side.
Further, the horizontal hook 4 that is rotationally driven clockwise when viewed from above is disposed on the right side of the cloth feed direction line L that passes through the needle drop position of the needle 1, so that the hook sword tip 4 a extends along the cloth feed direction A. The needle thread 6a of the sewing thread 6 is captured on the right side of the needle 1 by entering the right side of the needle 1 in the direction.
[0009]
In the arrangement of the needle and the hook shown in FIGS. 4 and 5, even if a general Z twist thread is used as the sewing thread 6, the hook edge of the hook sword tips 4a and 9a and the needle hole of the needle 1 are along the twist direction of the thread. Because of the structure that rubs the surface of the thread, the thread 6 does not return to the twist.
Accordingly, it is possible to prevent the occurrence of poor sewing due to the return of the yarn twist.
[0010]
However, in the arrangement of the needle and the hook shown in FIGS. 4 and 5, as shown in the figure, the space on the right side of the needle drop position is occupied by the hook and the driving shaft of the hook. As shown in FIG. 3, it cannot be disposed at a position close to the right side of the needle drop position.
Accordingly, as shown in the drawing, the cloth edge cutting device 8 is disposed at a position that is appropriately separated from the needle drop position of the needle 1 along the cloth feeding direction A so that the cloth edge cutting device 8 does not interfere with the hook or the like. ing.
[0011]
However, when the cloth edge cutting device 8 is moved away from the needle drop position as described above, the cloth is fed in the cloth feeding direction after the cloth is cut by the cloth edge cutting device 8 until the cloth is fed to the needle drop position. Misalignment is likely to occur in the direction orthogonal to A.
Such misalignment of the cloth edge becomes prominent when the material is thick or when the edge of the cloth is cut into a curved line, resulting in poor sewing that results in uneven finish width from the cloth edge to the seam after sewing. Therefore, in order to ensure the quality of the sewing product, there have been problems such as the thickness of the fabric being limited and the cutting shape being limited.
[0012]
The present invention has been made in view of the above-described problems, and the object thereof is to prevent the occurrence of poor sewing due to the return of the twist of the sewing thread, and when the fabric thickness of the sewing material is thick or the cloth edge Even when cutting in a curved line, the cloth edge is prevented from shifting when the cloth edge cutting device moves from the cloth cutting position to the sewing position, and the finished width from the cloth edge to the seam after sewing is uniform. An object of the present invention is to provide a main sewing machine with a cloth edge cutting device that can realize high-quality sewing and improve the processing capability such as the thickness of the fabric and the cutting shape.
[0013]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the main sewing machine with a cloth edge cutting device according to the present invention moves up and down along one axis by a needle drive mechanism and is viewed from the operator as described in claim 1. And a needle having a hook point that is disposed on the left side of the needle drop position of the single needle and captures a needle thread loop formed on the needle . A cloth end provided with a horizontal hook and a cloth edge cutting device that is disposed in the vicinity of the one horizontal hook and operates in synchronization with a sewing operation to sequentially cut the cloth edge in cooperation with a moving knife and a fixed knife. In the main sewing machine with a cutting device, the rotational direction of the one horizontal hook is set counterclockwise, and the hook point of the one horizontal hook and the needle hole edge of the one needle are twisted of the needle thread. In order to prevent twisting back of the needle thread caused by rubbing the surface of the needle thread in the opposite direction Said one of the horizontal hook of the shuttle hook point along with along the cloth feeding direction is advanced to the right of the single needle is capturing the needle thread loop at the right side of the needle of a single said sewing position from the cutting position of the cloth The cloth edge cutting device is disposed on the right side of the needle drop position and at a position close to the needle drop position so as to face the one horizontal hook so that the movement distance is reduced. And
[0014]
In a main sewing machine with a cloth edge cutter configured in this way, even if a general Z-twisted thread is used as the sewing thread, the hook point of the hook and the needle hole edge of the needle will cross the surface of the thread along the twisting direction of the thread. Due to the rubbing structure, there is no twist return on the sewing thread.
Therefore, it is possible to prevent the occurrence of poor sewing due to the return of the yarn twist, and to capture the needle thread loop on the right side of the needle, so that the seam can be formed into an accurate perfect stitch.
[0015]
Furthermore, since the space on the right side of the needle drop position becomes an empty space, the cloth edge cutting device can be arranged at a position as close as possible to the needle drop position on the right side of the needle drop position. By moving the cloth edge cutting device as close as possible, the movement distance from the cloth cutting position to the sewing position can be minimized.
That is, it is possible to prevent the cloth from being displaced in the direction perpendicular to the cloth feeding direction during the cloth feeding operation by minimizing the cloth feeding amount from when the cloth is cut to being fed to the needle drop position. .
[0016]
Therefore, even when the material thickness of the sewing material is thick or when the cloth edge is cut into a curved shape, when the cloth edge is moved from the cloth cutting position to the sewing position by the cloth edge cutting device, the cloth feed direction is perpendicular to the cloth feed direction. Misalignment can be prevented, high-quality sewing with a uniform finish width from the cloth end to the stitched seam can be realized, and the processing capability such as the fabric thickness and the cutting shape can be improved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a lockstitch sewing machine with a cloth edge cutting device according to the present invention will be described in detail with reference to the drawings.
In the following description of the embodiments, “left and right”, “right side”, and “left side” mean left, right, right, and left when viewed from the position of the operator who operates the sewing machine.
Further, “clockwise” and “counterclockwise” indicating the rotation direction of the shuttle mean that they are clockwise and counterclockwise when viewed from the upper surface side of the sewing machine.
[0018]
FIG. 1 is a perspective view showing an arrangement example of a needle, a shuttle, and a cloth edge cutting device in a first embodiment of a main sewing machine with a cloth edge cutting device according to the present invention.
In this first embodiment, the needle 1 is attached to the tip of a needle bar (not shown) in a posture with the edge portion 1a facing rightward when viewed from the operator side, and is moved in the direction of arrow D by the needle drive mechanism. Moved up and down.
In addition, the cloth feeding direction by the cloth feeding apparatus accommodated in the sewing machine frame 13 is an arrow A direction shown in the drawing.
[0019]
The shuttle 14 is disposed on the left side of the cloth feed direction line L passing through the needle drop position of the needle 1 when viewed from the operator side, and is counterclockwise when viewed from above (the direction of arrow E in the figure). The horizontal shuttle 14 is rotated horizontally.
Then, the horizontal hook 14 causes the hook sword tip 14 a to enter the right side of the needle 1 in the direction along the cloth feeding direction A, and captures the needle thread loop 6 a of the sewing thread 6 on the right side of the needle 1.
[0020]
The cloth end cutting device 8 operates in synchronization with the sewing operation of the needle 1 to move the cloth end in cooperation with a moving knife 8a that is driven to move up and down and a fixed knife 8b that is fixed below the moving knife 8a. It is cut sequentially, and is arranged at a position very close to the needle drop position on the right side of the cloth feed direction line L passing through the needle drop position.
[0021]
In the main sewing machine with the cloth edge cutting device having the above-described configuration, even if a general Z twisted thread is used as the sewing thread 6, the hook point 14a and the needle hole edge of the needle 1 are in the surface of the thread 6 along the thread twisting direction. Therefore, the thread 6 does not return to the twist. Accordingly, it is possible to prevent the occurrence of poor sewing due to the return of the yarn twist.
The horizontal hook 14 is a needle thread loop 6a on the right side of the needle 1 that is to be captured. The horizontal hook 14 is an outer scoop hook that captures the needle thread loop located on the side away from the hook, and the seam is formed into an accurate perfect stitch. can do.
[0022]
Further, the hook 14 and the drive shaft of the hook 14 are accommodated on the left side of the cloth feed direction line L passing through the needle drop position, and the space on the right side of the needle drop position is an empty space. The cloth edge cutting device 8 can be arranged at a position as close as possible to the needle drop position on the right side of the cloth.
Then, by moving the cloth end cutting device 8 as close as possible to the needle drop position in this way, the moving distance from the cloth cutting position to the sewing position can be minimized.
That is, by suppressing the amount of cloth feeding from when the cloth is cut to when it is fed to the needle drop position, it is possible to prevent the cloth from being displaced in the direction perpendicular to the cloth feeding direction during the cloth feeding operation. .
[0023]
Therefore, even when the material thickness of the sewing material is thick or when the cloth edge is cut into a curved shape, the cloth edge cutting device 8 moves from the cloth cutting position to the sewing position in a direction orthogonal to the cloth feed direction. Misalignment can be prevented, high-quality sewing with a uniform finish width from the cloth edge to the seam after sewing can be realized, and the processing capacity such as the fabric thickness and the cutting shape can be improved.
[0024]
FIG. 2 is a perspective view showing an arrangement example of the needle, the shuttle, and the cloth edge cutting device in the second embodiment of the main sewing machine with the cloth edge cutting device according to the present invention.
In the second embodiment, a part of the first embodiment is improved. Specifically, the cloth edge cutting device 18 is used instead of the cloth edge cutting device 8, and the other configurations are used. Is the same as that of the first embodiment. Common components are denoted by the same reference numerals and description thereof is omitted.
[0025]
The cloth edge cutting device 18 includes a sickle-shaped moving knife 18a that operates in synchronization with the sewing operation of the needle 1 and swings in the direction of the arrow F, and a fixed knife 18b that is fixedly provided facing the moving knife 18a. In collaboration, the fabric to be sewn is cut.
The equipment position of the cloth edge cutting device 18 is the same as in the first embodiment, and is a position very close to the needle drop position on the right side of the cloth feed direction line L passing through the needle drop position.
[0026]
Also Oite to the second embodiment described above, as in the first embodiment, to prevent the return of twist of suture 6, it is possible to avoid the occurrence of sewing defects caused by the return of twist, also, the sewing material Even when the cloth is thick or when the cloth edge is cut into a curved shape, the cloth edge is prevented from shifting when the cloth edge cutting device 18 moves from the cloth cutting position to the sewing position, and the cloth edge after the sewing is performed. High-quality sewing with a uniform finish width from the seam to the seam can be realized, and the processing capacity such as the fabric thickness and the cutting shape can be improved.
[0027]
【The invention's effect】
As described above, according to the main sewing machine with a cloth edge cutting device of the present invention described in claim 1, even if a general Z twist yarn is used as the sewing thread, the hook point of the hook and the needle hole edge of the needle are not Due to the structure in which the surface of the yarn is rubbed along the yarn twisting direction, no return of twisting occurs in the sewing thread. Therefore, it is possible to prevent the occurrence of poor sewing due to the return of the yarn twist, and to capture the needle thread loop on the right side of the needle, so that the seam can be formed into an accurate perfect stitch.
[0028]
Furthermore, since the space on the right side of the needle drop position becomes an empty space, the cloth edge cutting device can be arranged at a position as close as possible to the needle drop position on the right side of the needle drop position. By moving the cloth edge cutting device as close as possible, the movement distance from the cloth cutting position to the sewing position can be minimized.
That is, by suppressing the amount of cloth feeding from when the cloth is cut to when it is fed to the needle drop position, it is possible to prevent the cloth from being displaced in the direction perpendicular to the cloth feeding direction during the cloth feeding operation. .
[0029]
Therefore, even when the material thickness of the sewing material is thick or when the cloth edge is cut into a curved shape, when the cloth edge is moved from the cloth cutting position to the sewing position by the cloth edge cutting device, the cloth feed direction is perpendicular to the cloth feed direction. Misalignment can be prevented, high-quality sewing with a uniform finish width from the cloth edge to the seam after sewing can be realized, and the processing capacity such as the fabric thickness and the cutting shape can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part showing an arrangement of a needle, a shuttle and a cloth edge cutting device of a first embodiment of a lockstitch sewing machine with a cloth edge cutting device according to the present invention.
FIG. 2 is a perspective view of a main part showing an arrangement of a needle, a shuttle, and a cloth edge cutting device according to a second embodiment of a lockstitch sewing machine with a cloth edge cutting device according to the present invention.
FIG. 3 is a perspective view of a main part showing the arrangement of a needle, a shuttle, and a cloth edge cutting device of a conventional sewing machine with cloth edge cutting device.
FIG. 4 is a perspective view of a main part showing an arrangement of a needle, a shuttle, and a cloth edge cutting device of another conventional sewing machine with cloth edge cutting device.
FIG. 5 is a perspective view of a main part showing the arrangement of a needle, a shuttle and a cloth edge cutting device of still another conventional sewing machine with cloth edge cutting device.
[Explanation of symbols]
1 Needle 6 Sewing thread 6a Needle thread loop 8 Cloth edge cutting device 8a Moving knife 8b Fixed knife 13 Sewing machine frame 14 Horizontal hook 14a Hook blade tip 18 Cloth edge cutting apparatus 18a Moving knife 18b Fixed knife L Cloth feed direction line passing through needle drop position

Claims

The needle drive mechanism moves up and down along one axis, and is arranged on the left side of the needle drop position of the single needle with the edge portion arranged on the right side when viewed from the operator. A horizontal hook having a hook point that captures the needle thread loop formed on the needle, and a cloth knife and a fixed knife which are arranged in the vicinity of the horizontal hook and operate synchronously with a sewing operation. A sewing machine with a cloth edge cutting device, wherein the rotation direction of the one horizontal hook is set counterclockwise, and the one horizontal hook is to hook the hook point and the single needle needle hole edge of the can to prevent the needle thread twist return caused by rubbing the surface of the needle thread in the twisting direction opposite to the direction of the needle thread, the one horizontal right side hook of the shuttle hook point and along the cloth feeding direction is advanced to the right of the single needle needles one said Together thereby capturing the needle thread loop, so that the moving distance from the cutting position of the cloth to the sewing position is reduced, the cloth end cutting apparatus wherein at one opposite the horizontal hook of the needle drop position of the right side, and A sewing machine with a cloth edge cutting device, which is disposed at a position close to the needle drop position .