JP4296317B2

JP4296317B2 - Edge sewing machine for edge stitch machine

Info

Publication number: JP4296317B2
Application number: JP29272798A
Authority: JP
Inventors: 文男松本; 富雄井原; 要草積
Original assignee: Yamato Sewing Machine Mfg Co Ltd
Current assignee: Yamato Sewing Machine Mfg Co Ltd
Priority date: 1998-09-07
Filing date: 1998-09-07
Publication date: 2009-07-15
Anticipated expiration: 2018-09-07
Also published as: TW440628B; JP2000079292A

Description

【０００１】
【発明の属する技術分野】
本発明は縁かがり縫いミシンの空環縫い込み装置に関するもので、詳しくは、ニットＴシャツ、アウトウェア、肌着等の袖口や脇合わせ、ブリーフやショーツ等の脇合わせなどの縫製に適用されるもので、先行縫製生地の縫製終了後に残存する空環を次に縫製生地の縫い始め端の縫い目中に引き込んで縫い込むことにより、縫い始め端部のほつれを防止するように構成されている縁かがり縫いミシンの空環縫い込み装置に関するものである。
【０００２】
【従来の技術】
この種の縁かがり縫いミシンの空環縫い込み装置として、縫製終了後に針板の縫い目形成用爪部に連なって残存する空環を吸い込み切断した後、その切断空環を吹き返す作業から、その吹き返された空環を吸入保持して縫製生地の縫い始め端の縫い目中に引き込んで縫い込むとともに、余分な空環を切断するまでの作業を全自動化したものは従来から既に知られている。
【０００３】
ところで、従来から知られている縁かがり縫いミシンの空環縫い込み装置においては、図９に示すような構成の針板１が使用されていた。この針板１は、針落ち部２とこの針落ち部２を基端として矢印Ｘで示す縫製進行方向へ向けて突出形成された縫い目形成用の爪部３とを有しており、上記縫い目形成用爪部３の基端近くの手前部には固定下メス４ａとガイド５に沿って上下に駆動移動する可動メス４ｂからなる生地端切断用メス４が設けられている。そして、従来の針板１では、空環が縫い目の中に直線的に縫い込まれて美しい縫い目を形成できるようにするために、針板１の縫い目形成用爪部３の突出長さＬを長く、具体的には、８．４ｍｍ程度の長さに構成していた。
【０００４】
次に、上記図９に示すような構成の針板１を使用した従来の縁かがり縫いミシンの空環縫い込み装置の動作について図１０（Ａ）〜（Ｄ）を参照して簡単に説明する。
図１０（Ａ）は、後述する空環保持器に吸入保持された空環Ａを空環保持器（図１参照）の移動により針落ち部２よりも手前に引き込み、次の縫製生地Ｂをその縫い始め端縁ｅが縫製進行方向Ｘで上メスガイド５とほぼ同一線上に位置するように針板１上にセットした状態である。この状態でミシンを回転させることにより、縫製生地Ｂはその縫い始め端縁ｅが図１０（Ｂ）に示すように、針落ち部２の位置に到達するまで送られるが、この間は、針板１の爪部３に形成されて該爪部３に巻き付いている空環Ａはその巻き付き状態のままにある。さらに、縫製生地Ｂが縫製進行方向Ｘに送られることに伴い、空環Ａが爪部３から抜け出しながら、縫製生地Ｂ上に縫い付けられる。さらに、縫製生地Ｂが縫製進行方向Ｘに送られ、爪部３に巻き付いた空環Ａが爪部３から抜け出た時点、すなわち、縫製生地Ｂの縫い始め端縁ｅが爪部３の先端付近に達した図１０（Ｄ）の時点で、空環Ａを空環保持器により手前側に引張り、次の運針で縫製生地Ｂと共に空環Ａをメス４により切断する。
【０００５】
【発明が解決しようとする課題】
上記のように残存空環を縫製生地の縫い始め端側に引き込んで縫い目中に縫い込む通称、バックタック縫製においては、空環の縫い込み長さをできるだけ短くしたい場合がある。特に、婦人用ショーツの脇合わせのように、薄物地で縫製幅（長さ）が非常に小さい部分のバックタック縫製では、その縫い込み箇所が目立たず、かつ、着用感の面からもソフトな仕上がりを得るために、空環の縫い込み長さをできるだけ短くすることが要望される。
【０００６】
ところが、上記したように縫い目形成用爪部３の突出長さｌが長い針板１を使用してなる従来の縁かがり縫いミシンの空環縫い込み装置においては、爪部３から空環Ａが抜け出た時点、つまり、縫製生地Ｂの縫い始め端縁ｅが爪部３の先端付近に達した位置からメス４までの長さと、爪部３に巻き付いた空環Ａが抜け出しにくいこと、ミシンが高速回転しているので空環保持器により空環Ａを手前側に引張るタイミングを常に一定とすることが困難であること等のために、メス４で切断する空環Ａの長さにばらつきがあった。そのため、図１１に示すように、空環Ａの縫い目Ｃ中への縫い込み長さＨ２が長くなり、その縫い込み箇所が目立ち、かつ、着用感の面からソフトな仕上がりが得られないという問題があった。
【０００７】
一方、空環Ａの縫い込み長さを短くするために、図１０（Ｃ）のように、空環Ａが爪部３から抜け出る前に空環保持器により空環Ａを手前側に引張る場合は、図１２に示すように、縫い込まれる空環Ａの長さはばらつきながらも平均的にその分短くなるが、爪部３に巻き付いている空環部分Ａ′が団子状の塊となって、縫製生地Ｂの縫い始め端縁ｅより外方へ突出して綺麗な仕上がりを得ることができず、縫製品の品質向上の阻害要因となっていた。
【０００８】
本発明は上記のような実情に鑑みてなされたもので、針板に対して所定の縫い目形成になんらの支障も生じない簡単な構成改良を施すだけで、縫製生地の縫い始め端に団子状塊となって突出する空環部分の発生を防ぎつつ、その空環の縫い込み長さを短くして、美麗かつソフトな仕上がりを得ることができる縁かがり縫いミシンの空環縫い込み装置を提供することを目的としている。
【０００９】
【課題を解決するための手段】
上記目的を達成するために、本発明に係る縁かがり縫いミシンの空環縫い込み装置は、針落ち部及びこの針落ち部を基端として縫製進行方向へ向けて突出形成された縫い目形成用爪部を有する針板と、この針板上面への縫製生地の有無を検知し、縫製生地有のときミシン回転を許容する生地センサーと、上記針板の縫い目形成用爪部に連なる空環を吸い込むとともに切断し、かつ、その切断後の空環を吸い込み方向とは逆方向へ吹き返す空環切り装置と、この空環切り装置より吹き返された空環を受け取って吸入保持する第１位置とその空環の吸入保持状態で上記針板の縫い目形成用爪部の基端近くの手前部に設けられた生地端切断用メスの近傍位置へ後退して待機する第２位置とこの第２位置よりさらに縫製進行方向とは逆方向へ後退して空環を縫製生地の縫い始め端の縫い目中に引き込む第３位置とに亘って位置移動可能で、かつ、その第３位置において空環の吸入保持を解除可能に構成された空環保持器と、この空環保持器の上記第３位置への移動に伴い縫製生地の縫い始め端の縫い目中に引き込まれる空環を上記生地端切断用メスの切断部に誘導する空環誘導装置とを備えた縁かがり縫いミシンの空環縫い込み装置において、上記針板の縫い目形成用爪部は、針落ち部からの突出長さが５〜６．２ｍｍの範囲の長さに構成されているとともに、その基端が幅広で、先端が尖鋭であり、かつ、これら幅広基端と尖鋭先端とが縫製進行方向に対して傾斜する滑らかな曲線状の外側縁で結ばれて略三角形状に形成されており、また、上記空環誘導装置は、空環に係合可能な略Ｖ字状の係合部を有する空環押し具と、この空環押し具を上記空環保持器の第２位置から第３位置への移動に連動して上記生地端切断用メスの切断部へ向けて進出移動させる伸縮駆動手段とから構成されており、かつ、縫製生地が縫製進行方向に送られて、その縫い始め端縁から生地端切断用メスまでの寸法が所定長さとなる位置に達したとき、ミシンの回転が一旦、所定時間に亘って停止されると同時に、上記空環保持器が第２位置から第３位置に移動して上記第１位置で空環保持器に吸入保持された空環を針落ち部の手前側に引張り、その直後に上記空環誘導装置の空環押し具が生地端切断用メスの切断部へ向けて進出移動して余分な空環を生地端切断用メスの切断部に強制的に押し込み誘導し生地端と同時に切断し、その後、ミシンを通常縫製時の回転速度に復帰させて縫製生地を縫製進行方向へ送りながら空環を縫製生地の縫い始め端の縫い目中に引き込んで該縫い目中に縫い込むように構成していることを特徴とするものである。
【００１０】
上記のような構成の本発明によれば、縫製終了後に残存する空環のうち、針板の縫い目形成用爪部に巻き付いている空環の長さは短い。また、一端側部分が爪部に巻き付いている状態で空環切り装置より切断され吹き返されるとともに空環保持器に吸入保持された空環の他端側部分が、該空環保持器の第３位置への移動に伴い縫製進行方向とは逆方向に引張られて縫製生地の縫い始め端の縫い目中に引き込まれる際、上記爪部に巻き付いている一端側の空環部分は爪部から完全に抜け出ないまでも抜け出しやすい状態となっている。この状態で縫製生地が送られることにより、上記爪部に巻き付いている空環部分はその爪部から抜け出して縫い目中に縫い込まれていくが、このとき、もともと爪部に巻き付いている空環部分の長さが短いうえに、抜け出しやすい状態にあるために、縫製生地の縫い始め端に空環部分が団子状の塊となって突出するといった仕上がり不良の発生を防止することが可能であるとともに、縫い目中への空環の縫い込み長さも短くなり、美麗で、かつ着用感の面でソフトな仕上がりの空環縫い込みが可能となる。
特に、針板の縫い目形成用爪部の針落ち部からの突出長さが５〜６．２ｍｍの範囲の長さで従来の突出長さ（８．４ｍｍ程度）よりも短く構成されているだけでなく、その基端が幅広で、先端が尖鋭であり、かつ、これら幅広基端と尖鋭先端とが縫製進行方向に対して傾斜する滑らかな曲線状の外側縁で結ばれて略三角形状に形成されていることによって、縫製進行に伴い爪部に巻き付いている空環を爪部の先端部に引掛けない状態でスムーズに抜け出し案内させることができ、縫製生地の縫い始め端に微小な塊も生じないで非常に美麗な仕上がりとすることができる。
【００１１】
しかも、空環保持器の移動により縫製生地の縫い始め端の縫い目中に引き込まれた状態の空環を縫い目中に縫い込むに際して、縫製生地の縫い始め端縁が針板の爪部付近に達した時点で縫製生地の送りを一旦停止させて空環保持器により手前に引張りながら余分な空環を空環誘導装置を介して生地端切断用メスの切断部に誘導し生地端と同時に切断することにより、縫製生地をオーバーランさせることなく、所定の位置で確実に一旦停止させることが可能であり、これによって、空環の縫い込み長さを確実に短縮化することができる。
【００１２】
また、縫製生地の縫い始め端の縫い目中に引き込まれた空環のうち余分な空環を生地端切断用メスの切断部に誘導させるための空環誘導装置として、空環に係合可能な略Ｖ字状の係合部を有する空環押し具と、この空環押し具を上記空環保持器の第２位置から第３位置への移動に連動して上記生地端切断用メスの切断部へ向けて進出移動させる伸縮駆動手段とから構成されている強制誘導形式のものを用いているので、余分な空環をバラツキなく確実に切断部に誘導して切断することができ、空環の縫い込み長さを一層確実かつ安定よく短縮化することができる。
【００１３】
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態を図面にもとづいて説明する。
図１は本発明に係る縁かがり縫いミシンの空環縫い込み装置の主要部の構成を示す斜視図である。同図において、１１はクロスプレートで、このクロスプレート１１の所定位置には針板１が固定されている。
【００１５】
この針板１の基本的な構成は図９に示すものと同様であり、詳述すると、図２に明示するように、針落ち部２とこの針落ち部２を基端として矢印Ｘで示す縫製進行方向へ向けて突出形成された縫い目形成用の爪部３とを有しており、上記縫い目形成用爪部３の基端近くの手前部には固定下メス４ａとガイド５に沿って上下に駆動移動する可動メス４ｂからなる生地端切断用メス４が設けられている。図９に示すものと相違する点は、縫い目形成用爪部３の突出長さＬ１が縫い目形成に支障のない範囲で可能な限り短く、具体的には、５．６ｍｍ程度の長さに構成されていることと、その基端が幅広で、先端が尖鋭であり、かつ、これら幅広基端３ａと尖鋭先端３ｂとが縫製進行方向に対して傾斜する滑らかな曲線状の外側縁３ｃで結ばれて略三角形状に形成されていることである。
【００１６】
このような構成の針板１のほかに、針板１上面に対して押え腕１２を介して駆動昇降自在な押え金１３、針棒１４を介して上記針落ち部２に対して上下に駆動往復運動自在な針１５、針板１の上下に配置された投光器１６ａと受光器１６ｂとからなり、針板１の上面への縫製生地の有無を検知して縫製生地有り（暗状態）のときミシンの回転を許容する生地センサー１６が設けられているとともに、針板１に対して縫製進行方向Ｘの後方上方部には空環切り装置１７が配置され、かつ、針板１の右側部には空環保持器１８が配置され、さらに、針板１の左方上方部には空環誘導装置１９（図４、図５参照）が配置されている。
【００１７】
上記空環切り装置１７は、針板１の縫い目形成用爪部３に巻き付けられた空環部分に連なる空環を吸い込むとともに切断し、かつ、その切断後の空環を吸い込み方向とは逆方向へ向けて吹き返すもので、これは周知であるため、その詳細な構成の説明は省略する。上記空環保持器１８は、空環押えシリンダ２０を取付けた空環押えシリンダ取付台２１から左方へ延出されたエアー吸込管からなり、上記記空環切り装置１７より吹き返された空環Ａを受け取って吸入保持する図３の第１位置とその空環Ａの吸入保持状態で針板１の縫い目形成用爪部３の基端近くの手前部の生地端切断用メス４の近傍位置に後退揺動して待機する図３の第２位置と空環Ａの縫い込み動作の開始に伴って第２位置よりもさらに縫製進行方向Ｘとは逆方向へ後退揺動して空環Ａを縫製生地Ｂの縫い始め端の縫い目中に引き込む図３の第３位置）とに亘って、図示省略した位置を支点としてエアシリンダなどを介して矢印Ｙ方向に駆動揺動自在に構成されている。
【００１８】
また、上記空環誘導装置１９は、図４及び図５に明示するように、空環Ａに係合可能な略Ｖ字状の係合部２２を有する空環押し具２３と、この空環押し具２３を押え金１３の斜め左上方位置から斜め右下方の生地端切断用メス４の切断部へ向けて進出移動並びに退却移動させる図示省略したエアシリンダなどの伸縮駆動手段とからなり、通常は図４に示すように、押え金１３の斜め左上方位置に待機しており、上記空環保持器１８が第２位置から第３位置へ移動することに連動して図５に示すように、斜め右下方へ進出移動して空環Ａを生地端切断用メス４の切断部に強制的に押し込み誘導するように構成されている。
【００１９】
さらに、該縁かがり縫いミシンは、縫製生地Ｂの縫い始め端縁ｅから生地端縁切断用上メス４までの寸法が所定長さとなる位置に達したとき、ミシンの回転が一旦、所定時間に亘って停止させるといったように、縫製生地Ｂの縫い始め端の縫い目中に引き込まれた空環Ａを縫い目中に縫い込む時の回転速度が、通常縫製時の回転速度よりも低速に設定されている。
【００２０】
次に、上記のように構成された縁かがり縫いミシンの空環縫い込み装置の動作について、図６のタイミングチャート及び図７（Ａ）〜（Ｃ）の状態変化図を参照して説明する。
【００２１】
先行する縫製生地の縫い終り端が生地センサー１６を通過し該センサー１６が非検知（明状態）となった時点で空環切り装置１７が吸い込みを開始して残存する空環を吸い込むとともに、公知の糸緩め装置がＯＮして糸を緩める一方、ミシンは予め設定された運針数に達するまで回転（地縫い時の高速回転）を続けその間に針板１の縫い目形成用爪部３に一定長さの空環が形成される。設定運針数に達すると、ミシンの回転が停止し、上記空環切り装置１７が吸い込んだ空環を切断するとともに、その切断した空環を吸い込み方向とは逆方向へ吹き出し、その直後に図３の第２位置に待機していた空環保持器１８が第１位置に移動するとともに、エア吸い込みを開始して空環切り装置１７より噴出される空環Ａを吸引保持した後、再び第２位置に移動して待機すると同時に、押え金１３は針板１の上面から離間するように上昇する。
【００２２】
次に、上記空環保持器１８に吸入保持された空環Ａが該空環保持器１８の第２位置への移動により針板１の針落ち部２よりも手前に引き込まれた図７（Ａ）に示す状態で、次の縫製生地Ｂをその縫い始め端縁ｅが縫製進行方向Ｘで上メスガイド５とほぼ同一線上に位置するように針板１上にセットし、上記生地センサー１６がそれを検知（暗状態）すると、押え金１３が針板１の上面に当接するように下降するとともに、糸緩め装置がＯＦＦとなって糸緩めを解除し、縫製の開始が可能となる。
【００２３】
この状態で、ペダルをＯＮすると、ミシンが回転し始めるが、このときのミシンの回転速度は地縫い時の回転速度に比べて低速に設定されているため、縫製生地Ｂは縫製進行方向Ｘに向けて、その縫い始め端縁ｅが針板１の針落ち部２に到達するまでゆっくりと送られることになり、この間に、針板１の縫い目形成用爪部３に巻き付いている空環Ａは、図７（Ｂ）に示すように、該爪部１ａの傾斜する滑らかな曲線状外側縁３ｃに沿ってその尖鋭先端部３ｂ付近にまで摺動して非常に抜け出しやすい状態になっている。
【００２４】
さらに、縫製生地Ｂが縫製進行方向Ｘに送られて、その縫い始め端縁ｅから生地端縁切断用上メス４までの寸法が所定長さとなる位置に達したとき、ミシンの回転が一旦、所定時間に亘って停止されると同時に、上記空環保持器１８が第２位置から図３の第３位置に移動して空環Ａを針落ち部２の手前側に引張ることになり、その直後に空環誘導装置１９がＯＮし略Ｖ字状の係合部２２を有する空環押し具２３が押え金１３の斜め左上方位置から斜め右下方の生地端切断用メス４の切断部へ向けて進出移動し、これに伴い空環Ａは上記係合部２２に係合されて図７（Ｃ）に示すように、生地端切断用メス４の切断部に強制的に押し込み誘導されて余分な空環が生地端と同時に切断されることになり、かつ、空環保持器１８による吸引保持は解除される。
【００２５】
しかる後、ミシンが地縫い時の高速回転に復帰して縫製生地Ｂを所定の縫製進行方向Ｘに送りながら、その縫い始め端の縫い目中に空環Ａを縫い込むことになり、これによって、図８に示すように、縫い始め端に空環Ａが団子状の塊となって突出することがないばかりでなく、空環Ａの縫い目Ｃ中への縫い込み長さＨ３も非常に短くなり、非常に美麗で、かつ、着用感においてソフトな仕上がりを得ることができる。
【００２６】
さらに、上記のような空環縫い込み後の地縫い時の運針数が所定値に達した時点で、上記空環誘導装置１９は、図４に示す斜め左上方位置に復帰移動し、かつ、空環保持器１８も第２位置に復帰して次の空環縫い込みに備えられることになる。
【００２７】
【００２８】
また、上記実施の形態では、空環Ａの縫い込み時のミシンの回転速度を通常縫製（地縫い）時の回転速度よりも低速に設定することによって、縫製生地Ｂがその縫い始め端縁ｅから生地端切断用メス４までの寸法が所定長さとなる位置に達したとき、縫製生地Ｂをオーバーランさせることなく、所定の位置で確実に一旦停止させることが可能であり、これによって、空環Ａの縫い込み長さの短縮化を確実化できる。
【００２９】
さらに、上記実施の形態の縁かがり縫いミシンは、１本針であるが、２本針の縁かがり縫いミシンに適用しても、同様な効果が奏されるものである。
【００３０】
なお、縫い目形成用爪部３の突出長さについて、上記実施の形態では、針落ち部２から５．６ｍｍ程度の長さとしたが、空環Ａの縫い込み長さは使用する糸の伸縮性によっても影響され、伸縮性のある糸の場合は５．６ｍｍよりも少し長目でもよく、伸縮性のない糸の場合は５．６ｍｍよりも少し短目でもよい。その範囲は、おおよそ５ｍｍから６．２ｍｍが許容値である。
【００３１】
【発明の効果】
以上のように、本発明によれば、針板の縫い目形成用爪部の針落ち部からの突出長さを５〜６．２ｍｍの範囲の長さで従来の突出長さ（８．４ｍｍ程度）よりも短くするといった極く簡単な構成改良を施すだけで、爪部に巻き付いて残存する空環部分の長さを短くできるとともに、その巻き付いた空環部分を抜け出しやすい状態に保持できるために、空環が縫製生地の縫い始め端に団子状の塊となって残存突出するといった仕上がり不良の発生を防止できる。
しかも、爪部は、その基端が幅広かつ先端が尖鋭で、その幅広基端と尖鋭先端とが縫製進行方向に対して傾斜する滑らかな曲線状の外側縁で結ばれて略三角形状に形成されているので、縫製の進行に伴い爪部に巻き付いている空環を爪部の先端部に引掛からない状態でスムーズに抜け出し案内させることができて、縫製生地の縫い始め端に微小な塊も生じないで非常に美麗な仕上がりとすることができる。したがって、全体として空環の縫い込み長さを可及的に短くして、その空環縫い込み箇所が目立たない美麗で、かつ、着用感においてソフトな仕上がりの空環縫い込み縫製品を得ることができる。
【００３２】
しかも、縫製生地の縫い始め端縁が針板の爪部付近に達した時点で縫製生地の送りを一旦停止させて空環保持器により手前に引張りながら余分な空環を空環誘導装置を介して生地端切断用メスの切断部に誘導し生地端と同時に切断することにより、縫製生地をオーバーランさせることなく、所定の位置で確実に一旦停止させることが可能であり、これによって、空環の縫い込み長さの短縮化をより確実なものとすることができるという効果を奏する。
【００３３】
【図面の簡単な説明】
【図１】本発明に係る縁かがり縫いミシンの空環縫い込み装置の主要部の構成を示す斜視図である。
【図２】同上縁かがり縫いミシンの空環縫い込み装置における針板の構成を示す拡大平面図である。
【図３】同上縁かがり縫いミシンの空環縫い込み装置における空環保持器の構成及び動作を示す要部の拡大一部切欠き平面図である。
【図４】同上縁かがり縫いミシンの空環縫い込み装置における空環誘導装置の構成を示す要部の拡大斜視図である。
【図５】同上空環誘導装置が動作した状態を示す要部の拡大斜視図である。
【図６】同上空環縫い込み装置における動作タイミングを説明するタイミングチャートである。
【図７】（Ａ）〜（Ｃ）は空環縫い込み動作の状態変化図である。
【図８】空環縫い込み後の縫製品を示す斜視図である。
【図９】従来の縁かがり縫いミシンの空環縫い込み装置における針板の構成を示す拡大平面図である。
【図１０】（Ａ）〜（Ｄ）は従来の縁かがり縫いミシンの空環縫い込み装置による空環縫い込み動作の状態変化図である。
【図１１】従来の縁かがり縫いミシンの空環縫い込み装置による空環縫い込み後の縫製品の一例を示す斜視図である。
【図１２】従来の縁かがり縫いミシンの空環縫い込み装置による空環縫い込み後の縫製品の他の例を示す斜視図である。
【符号の説明】
１針板
２針落ち部
３縫い目形成用爪部
３ａ幅広基端部
３ｂ尖鋭先端部
３ｃ曲線状外側縁
４生地端切断用メス
１６生地センサー
１７空環切り装置
１８空環保持器
１９，１９′ 空環誘導装置
２２略Ｖ字状係合部
２３空環押し具
Ａ空環
Ｂ縫製生地
ｅ縫い始め端縁[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an empty stitching device for an edge stitch sewing machine, and more specifically, applied to sewing knit T-shirts, outwear, underwear and other cuffs and side by side, briefs and shorts, etc. Then, the edge ring configured to prevent fraying at the sewing start end by drawing the empty ring remaining after the completion of the sewing of the preceding sewing fabric into the seam at the sewing start end of the sewing fabric and then sewing it. The present invention relates to an empty stitching device for a sewing machine.
[0002]
[Prior art]
This type of edge stitching sewing machine has an empty ring stitching device that, after the end of sewing, sucks and cuts the remaining empty ring connected to the stitch forming claw portion of the needle plate, and then blows back the cut idle ring. It has already been known that the empty ring is sucked and held, pulled into the seam at the sewing start end of the sewing fabric and sewn, and the operation until the unnecessary empty ring is cut is fully automated.
[0003]
By the way, in a conventionally known idle stitching device for an edge stitch machine, a needle plate 1 having a structure as shown in FIG. 9 has been used. The throat plate 1 has a needle drop portion 2 and a claw portion 3 for forming a seam that projects from the needle drop portion 2 in the sewing progress direction indicated by an arrow X, and has the seam described above. Near the base end of the forming claw portion 3, there is provided a cloth end cutting knife 4 including a fixed lower knife 4 a and a movable knife 4 b that moves up and down along the guide 5. In the conventional throat plate 1, the protruding length L of the seam forming claw portion 3 of the throat plate 1 is set so that the empty ring can be linearly sewn into the seam to form a beautiful seam. It was long and specifically configured to have a length of about 8.4 mm.
[0004]
Next, briefly described with reference to FIG. 10 (A) ~ (D) Operation of the air ring sewn device of a conventional overlock stitch sewing machine using a needle plate 1 of a configuration as shown in FIG 9 .
FIG. 10 (A) pull in front of the needle unit 2 by the movement of the air ring A an empty ring retainer sucked held emptied ring retainer to be described later (see FIG. 1), the following sewing fabric B This is a state in which the sewing start edge e is set on the throat plate 1 so as to be positioned substantially on the same line as the upper knife guide 5 in the sewing progress direction X. By rotating the sewing machine in this state, as sewing fabric B is its sewing start edge e shown in FIG. 10 (B), but sent until it reaches the position of the needle unit 2, during this time, the needle plate An empty ring A formed on one claw portion 3 and wound around the claw portion 3 remains in its wound state. Further, as the sewing fabric B is sent in the sewing progress direction X, the empty ring A is sewn onto the sewing fabric B while coming out of the claw portion 3. Further, when the sewing fabric B is sent in the sewing progress direction X and the empty ring A wound around the claw portion 3 comes out of the claw portion 3, that is, the sewing start edge e of the sewing fabric B is near the tip of the claw portion 3. at shown in FIG. 10 (D) has been reached, pull the front side of the air ring a by the air ring retainer, to cut the air ring a by knife 4 with sewing fabric B in the next hand movement.
[0005]
[Problems to be solved by the invention]
As described above, there is a case in which it is desired to shorten the stitching length of the empty ring as much as possible in back tack sewing, in which the remaining empty ring is drawn into the sewing start end side of the sewing fabric and sewn into the seam. In particular, in backtack sewing where the sewing width (length) is very small, such as side by side for women's shorts, the sewn part is not noticeable and soft in terms of wear. In order to obtain a finish, it is desired to make the stitching length of the empty ring as short as possible.
[0006]
However, as described above, in the conventional edge stitching device of the edge stitch sewing machine using the throat plate 1 in which the protruding length l of the seam forming claw part 3 is long, the ring A is formed from the claw part 3. At the time of withdrawal, that is, the length from the position at which the sewing start edge e of the sewing fabric B reaches the vicinity of the tip of the claw part 3 to the knife 4, the empty ring A wrapped around the claw part 3 is difficult to come off, Because of the high speed rotation, it is difficult to always keep the timing of pulling the ring A toward the front side by the ring holder, so that the length of the ring A cut by the knife 4 varies. there were. Therefore, as shown in FIG. 11 , the stitch length H2 into the seam C of the empty ring A becomes longer, the stitched portion is conspicuous, and a soft finish cannot be obtained from the aspect of wearing feeling. was there.
[0007]
Meanwhile, in order to shorten the sewn length of empty ring A, as shown in FIG. 10 (C), the case of pulling the air ring A to the front side by the air ring retainer before air ring A comes out of the claw portion 3 As shown in FIG. 12 , the length of the empty ring A to be sewn is reduced by an average even though it varies, but the empty ring portion A ′ wound around the claw portion 3 becomes a dumpling-like lump. As a result, the sewing material B protrudes outward from the sewing start edge e, and a beautiful finish cannot be obtained, which is an impediment to improving the quality of the sewing product.
[0008]
The present invention has been made in view of the above-described circumstances, and a simple configuration improvement that does not cause any trouble in the formation of a predetermined stitch on the needle plate is performed, and a dumping shape is formed at the sewing start end of the sewing fabric. Providing an edge stitching device for edge stitched sewing machines that can prevent the occurrence of an empty ring portion protruding as a lump and shorten the stitch length of the ring to obtain a beautiful and soft finish. The purpose is to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above-described object, an empty stitching device for an edge stitch sewing machine according to the present invention includes a needle drop portion and a stitch forming nail that is formed to protrude toward the sewing progress direction with the needle drop portion as a base end. A needle plate that has a stitch portion, a cloth sensor that detects the presence or absence of sewing fabric on the top surface of the needle plate, and allows the sewing machine to rotate when sewing fabric is present, and an empty ring connected to the stitch forming claw portion of the needle plate. And an empty ring cutting device that blows off the empty ring after cutting in a direction opposite to the suction direction, a first position that receives and holds the empty ring blown back from the empty ring cutting device, and the empty position. A second position for retreating to a position near a cloth edge cutting knife provided near the proximal end of the stitch forming claw portion of the stitch plate in the state where the ring is sucked and held, and further than the second position. Retreat in the direction opposite to the sewing progress direction. An empty ring retainer configured to be movable over a third position at which the ring is drawn into the seam at the sewing start end of the sewing fabric, and capable of releasing the suction holding of the empty ring at the third position; An empty ring guiding device for guiding an empty ring drawn into a seam at a sewing start end of the sewing fabric to the cutting portion of the cloth edge cutting knife as the empty ring retainer moves to the third position; In the ring stitch stitching device of the edge stitch machine, the stitch forming claw portion of the needle plate has a protruding length from the needle drop portion in a range of 5 to 6.2 mm. The base end is wide, the tip is sharp, and the wide base end and the sharp tip are connected to each other by a smooth curved outer edge that is inclined with respect to the sewing progressing direction, and is formed in a substantially triangular shape. in addition, the air-ring induction apparatus, generally V-engageable empty ring An empty ring pusher having an engaging portion of the ring, and the empty ring pusher toward the cutting portion of the knife for cutting the fabric end in conjunction with the movement of the empty ring retainer from the second position to the third position. When the sewing fabric is sent in the sewing progress direction and the dimension from the sewing start edge to the knife for cutting the fabric edge reaches a predetermined length. Once the rotation of the sewing machine, and at the same time is stopped for a predetermined time, the air-ring retainer is sucked held emptied ring retainer to move in the first position from the second position to the third position empty Pull the ring toward the front side of the needle drop part, and immediately after that, the empty ring pusher of the empty ring guiding device moves forward toward the cutting part of the knife for cutting the fabric edge, and the excess empty ring is moved to the knife for cutting the fabric edge. Forcibly push into the cutting part of the fabric, cut it at the same time as the fabric edge, and then sew the sewing machine normally And characterized in that is configured so as sewn into the seam Nde write pull the air ring while returning the rotational speed feed sewing fabric to the sewing direction of travel at the time of manufacturing in a seam at the sewing start end of sewing fabric To do.
[0010]
According to the present invention configured as described above, the length of the empty ring wound around the stitch forming claw portion of the needle plate is short among the empty rings remaining after the end of sewing. Further, the other end side portion of the empty ring that is cut and blown back from the empty ring cutting device while the one end side portion is wound around the claw portion and sucked and held in the empty ring retainer is the third ring of the empty ring retainer. When it is pulled in the seam at the sewing start end of the sewing fabric by pulling in the direction opposite to the sewing progress direction as it moves to the position, the empty ring part on one end side that is wound around the nail part is completely removed from the nail part. Even if it does not come out, it is in a state where it is easy to come out. When the sewing fabric is fed in this state, the empty ring part wound around the nail part comes out of the nail part and is sewn into the seam. At this time, the empty ring part originally wound around the nail part Since the length of the portion is short and it is easy to come out, it is possible to prevent the occurrence of defective finishing such that the empty ring portion protrudes as a dumpling lump at the sewing start end of the sewing fabric. At the same time, the stitching length of the sky ring into the seam is shortened, and it is possible to stitch the sky ring in a beautiful and soft finish.
In particular, the protruding length from the needle drop portion of the stitch forming claw portion of the throat plate is a length in the range of 5 to 6.2 mm, which is shorter than the conventional protruding length (about 8.4 mm). Rather, the base end is wide, the tip is sharp, and the wide base end and the pointed tip are joined by a smooth curved outer edge that is inclined with respect to the sewing progress direction to form a substantially triangular shape. As a result of the formation, it is possible to smoothly pull out and guide the empty ring wound around the claw part as it is not being hooked to the tip part of the claw part as the sewing progresses, and a minute lump at the sewing start end of the sewing fabric It is possible to obtain a very beautiful finish.
[0011]
In addition, when the empty ring that has been pulled into the seam at the sewing start end of the sewing fabric is sewn into the seam by the movement of the empty ring retainer, the sewing start edge of the sewing fabric reaches the vicinity of the claw portion of the needle plate. At that time, the feeding of the sewing fabric is temporarily stopped, and the excess ring is guided to the cutting part of the knife for cutting the cloth end via the ring guide device while being pulled forward by the ring retainer and cut simultaneously with the cloth end. it makes without overrunning the sewing fabric, it is possible to reliably once stopped at a predetermined position, whereby it is possible to reliably shorten the sewn length of empty ring.
[0012]
Further, as the air-ring induction device for inducing the cut portion of the cloth end cutting knife excess air ring of the air ring was drawn into seam at the sewing start end of sewing fabric, engage the empty ring An empty ring pusher having a substantially V-shaped engaging portion, and the cloth edge cutting knife in conjunction with the movement of the empty ring pusher from the second position to the third position of the empty ring retainer. Because it uses a forced induction type that consists of an expansion and contraction drive means that moves forward toward the cutting part, it is possible to reliably guide and cut the excess empty ring to the cutting part without variation, The stitching length of the ring can be shortened more reliably and stably.
[0013]
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a configuration of a main part of an idle stitching device for an edge stitch sewing machine according to the present invention. In the figure, reference numeral 11 denotes a cross plate. A needle plate 1 is fixed to a predetermined position of the cross plate 11.
[0015]
The basic configuration of the needle plate 1 is the same as that shown in FIG. 9. More specifically, as shown in FIG. 2, the needle drop part 2 and the needle drop part 2 are indicated by an arrow X with the needle drop part 2 as a base end. A seam-forming claw portion 3 projecting in the direction of sewing progress, and the front portion near the base end of the seam-forming claw portion 3 extends along a fixed lower knife 4 a and a guide 5. A cloth edge cutting knife 4 comprising a movable knife 4b that moves up and down is provided. The difference from the one shown in FIG. 9 is that the protruding length L1 of the seam forming claw portion 3 is as short as possible without causing any trouble in the formation of the seam, specifically, a length of about 5.6 mm. And that the base end is wide, the tip is sharp, and the wide base end 3a and the sharp tip 3b are connected by a smooth curved outer edge 3c that is inclined with respect to the sewing progressing direction. That is, it is formed in a substantially triangular shape.
[0016]
In addition to the needle plate 1 having such a configuration, the upper surface of the needle plate 1 is driven up and down with respect to the needle drop portion 2 through a presser foot 13 that can be driven up and down via a presser arm 12 and a needle bar 14. When there is a sewing fabric (dark state) by detecting the presence or absence of the sewing fabric on the upper surface of the needle plate 1, comprising a reciprocating needle 15, a projector 16 a and a light receiver 16 b disposed above and below the needle plate 1. A cloth sensor 16 that allows the rotation of the sewing machine is provided, and an empty ring cutting device 17 is disposed on the rear upper side in the sewing progress direction X with respect to the needle plate 1, and on the right side of the needle plate 1. An empty ring retainer 18 is disposed, and an empty ring guiding device 19 (see FIGS. 4 and 5) is disposed on the upper left portion of the needle plate 1.
[0017]
The empty ring cutting device 17 sucks and cuts the empty ring connected to the empty ring portion wound around the stitch forming claw portion 3 of the needle plate 1 and cuts the empty ring after the cutting in a direction opposite to the suction direction. Since this is well known, a detailed description of its configuration is omitted. The empty ring retainer 18 is composed of an air suction pipe extending leftward from an empty ring holding cylinder mounting base 21 to which an empty ring holding cylinder 20 is mounted, and an empty ring blown back from the empty ring cutting device 17. The first position in FIG. 3 where A is received and sucked and held, and the position near the cloth end cutting knife 4 near the base end of the stitch forming claw part 3 of the needle plate 1 in the sucked and held state of the empty ring A The second position shown in FIG. 3 and the idle ring A are set back to the standby position, and the idle ring A is further moved backward in the direction opposite to the sewing progress direction X from the second position with the start of the sewing operation of the idle ring A. 3 is pulled into the seam at the sewing start end of the sewing fabric B), and is configured to be swingable in the direction of the arrow Y via an air cylinder or the like with the position not shown as a fulcrum. Yes.
[0018]
Further, as shown in FIGS. 4 and 5, the empty ring guiding device 19 includes an empty ring pusher 23 having a substantially V-shaped engagement portion 22 that can be engaged with the empty ring A, and the empty ring. The pusher 23 is composed of an expansion / contraction drive means such as an air cylinder (not shown) that moves forward and backward from the upper left position of the presser foot 13 toward the cutting portion of the knife 4 for cutting the fabric edge obliquely lower right. As shown in FIG. 4, the stand-by is in the upper left position of the presser foot 13, and as shown in FIG. 5, in conjunction with the movement of the empty ring retainer 18 from the second position to the third position. Then, it is configured to move forward and obliquely to the lower right to forcibly push the empty ring A into the cutting portion of the knife 4 for cutting the fabric end.
[0019]
Further, when the edge sewing machine reaches a position where the dimension from the sewing start edge e of the sewing fabric B to the upper knife 4 for cutting the fabric edge reaches a predetermined length, the rotation of the sewing machine is temporarily stopped at a predetermined time. over and as such stop, the sewing speed when the sewing start end air ring a which is drawn into the seam of the fabric B sewn into seam, typically set to a speed lower than the rotational speed during sewing Yes.
[0020]
Next, the operation of the idle stitching device of the edge stitch machine constructed as described above will be described with reference to the timing chart of FIG. 6 and the state change diagrams of FIGS.
[0021]
When the sewing end of the preceding sewing fabric passes through the fabric sensor 16 and the sensor 16 becomes non-detected (bright state), the idle ring cutting device 17 starts sucking in and sucks the remaining empty ring. The thread loosening device is turned on to loosen the thread, while the sewing machine continues to rotate (high-speed rotation during ground stitching) until the preset number of stitches is reached, during which the stitch forming claw portion 3 of the stitch plate 1 has a certain length. An empty ring is formed. When the set number of stitches is reached, the rotation of the sewing machine stops, the empty ring cut by the empty ring cutting device 17 is cut, and the cut empty ring is blown out in the direction opposite to the sucking direction. The air ring retainer 18 that has been waiting at the second position moves to the first position, and after sucking and holding the air ring A ejected from the air ring cutting device 17 by starting the air suction, the second air ring again. At the same time as moving to the position and waiting, the presser foot 13 rises away from the upper surface of the needle plate 1.
[0022]
Next, the empty ring A sucked and held in the empty ring retainer 18 is drawn in front of the needle drop portion 2 of the needle plate 1 by the movement of the empty ring retainer 18 to the second position (FIG. 7). In the state shown in A), the next sewing fabric B is set on the needle plate 1 so that the sewing start edge e is positioned substantially on the same line as the upper knife guide 5 in the sewing progress direction X, and the fabric sensor 16 When this is detected (dark state), the presser foot 13 is lowered so as to contact the upper surface of the throat plate 1, and the thread loosening device is turned off to release the thread loosening and sewing can be started.
[0023]
When the pedal is turned on in this state, the sewing machine starts to rotate. At this time, since the rotational speed of the sewing machine is set to be lower than the rotational speed at the time of ground sewing, the sewing fabric B moves in the sewing progress direction X. Then, the sewing start edge e is slowly fed until it reaches the needle drop portion 2 of the needle plate 1, and during this time, an empty ring A wound around the stitch forming claw portion 3 of the needle plate 1. As shown in FIG. 7B, the claw portion 1a slides to the vicinity of the sharp tip portion 3b along the slanted curved outer edge 3c and is in a state of being easily pulled out. .
[0024]
Further, when the sewing fabric B is fed in the sewing progress direction X and the dimension from the sewing start edge e to the fabric edge cutting upper knife 4 reaches a predetermined length, the sewing machine rotates once. At the same time it is stopped for a predetermined time, the above-mentioned empty ring retainer 18 moves from the second position to the third position in FIG. 3 and pulls the empty ring A toward the front side of the needle drop portion 2, Immediately after that, the ring guide device 19 is turned on and the ring pusher 23 having the substantially V-shaped engagement portion 22 is moved from the diagonally upper left position of the presser foot 13 to the cutting portion of the knife 4 for cutting the fabric edge diagonally lower right. advances move toward the sky ring a is engaged with the engaging portion 22 Accordingly, as shown in FIG. 7 (C), is forced to push induced cleavage of the cloth end cutting knife 4 extra air rings becomes Rukoto is cut simultaneously with the cloth end and the suction holding by the air ring retainer 18 solution It is.
[0025]
Thereafter, the sewing machine returns to the high-speed rotation at the time of the ground sewing and feeds the sewing fabric B in the predetermined sewing progress direction X, and sews the empty ring A into the seam at the sewing start end. As shown in FIG. 8, not only the empty ring A does not protrude as a dumpling lump at the sewing start end, but also the sewing length H3 into the seam C of the empty ring A becomes very short. Very beautiful and soft finish can be obtained.
[0026]
Furthermore, when the number of hands at the time of sewing the ground ring after sewing reaches the predetermined value, the ring guide device 19 returns to the diagonally upper left position shown in FIG. The empty ring retainer 18 is also returned to the second position and is prepared for the next empty ring stitching.
[0027]
[0028]
Further, in the above embodiment, the sewing fabric B is set to the sewing start edge e by setting the rotational speed of the sewing machine when the empty ring A is sewn to a lower speed than the rotational speed during normal sewing (ground sewing). When the dimension from the cutting edge 4 to the cutting edge 4 reaches a predetermined length, the sewing cloth B can be surely stopped once at a predetermined position without overrunning. The shortening of the sewing length of the ring A can be ensured.
[0029]
Further, the edge stitching machine of the above embodiment is a single needle, but the same effect can be obtained even when applied to the edge stitch machine with two needles.
[0030]
The protruding length of the seam forming claw portion 3 is about 5.6 mm from the needle drop portion 2 in the above embodiment, but the stitching length of the empty ring A is the stretchability of the thread used. In the case of a stretchable yarn, it may be slightly longer than 5.6 mm, and in the case of a non-stretchable yarn, it may be slightly shorter than 5.6 mm. The allowable range is approximately 5 mm to 6.2 mm.
[0031]
【The invention's effect】
As described above, according to the present invention, the projection length from the needle drop portion of the stitch forming claw portion of the needle plate is a length in the range of 5 to 6.2 mm and the conventional projection length (about 8.4 mm). To make it possible to shorten the length of the remaining ring around the nail and to keep the wound ring in a state that can easily be pulled out. Further, it is possible to prevent a defective finish such that the empty ring protrudes as a dumpling-like lump at the sewing start end of the sewing fabric.
In addition, the claw portion is formed in a substantially triangular shape by connecting the wide base end and the sharp tip with a smooth curved outer edge that is inclined with respect to the sewing progressing direction. As the sewing progresses, the empty ring wound around the nail can be smoothly pulled out and guided without being caught by the tip of the nail, and a small lump is sewn at the sewing start end of the sewing fabric. It is possible to obtain a very beautiful finish. Therefore, as a whole, the stitching length of the empty ring is shortened as much as possible to obtain a beautifully-rounded stitched product that is not noticeable and has a soft finish. Can do.
[0032]
In addition, when the sewing start edge of the sewing fabric reaches the vicinity of the claw portion of the needle plate, the feed of the sewing fabric is temporarily stopped and the excess ring is pulled through the ring guide device while being pulled forward by the ring holder. by cutting at the same time as the induced cloth end in the cutting portion of the cloth end cutting knife Te, without overrunning the sewing cloth is certainly possible once stopped at a predetermined position, depending on this, empty There is an effect that the shortening of the sewing length of the ring can be made more reliable.
[0033]
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a main part of an idle stitching device for an edge stitch sewing machine according to the present invention.
FIG. 2 is an enlarged plan view showing a configuration of a throat plate in the empty ring stitching device of the above-mentioned edge stitch machine.
FIG. 3 is an enlarged partially cutaway plan view of the main part showing the configuration and operation of an empty ring retainer in the empty ring stitching device of the upper edge sewing machine.
FIG. 4 is an enlarged perspective view of a main part showing a configuration of an empty ring guiding device in the empty ring stitching device of the upper edge sewing machine.
FIG. 5 is an enlarged perspective view of a main part showing a state in which the sky ring guidance device operates.
FIG. 6 is a timing chart for explaining operation timings in the above-described empty ring stitching device.
FIGS. 7A to 7C are state change diagrams of an idle stitching operation. FIGS.
FIG. 8 is a perspective view showing a sewn product after empty ring sewing.
FIG. 9 is an enlarged plan view showing a configuration of a needle plate in a conventional loop stitcher for an edge stitch sewing machine.
FIGS. 10A to 10D are state change diagrams of an idle stitching operation performed by an idle stitching device of a conventional edge stitch sewing machine. FIGS.
FIG. 11 is a perspective view showing an example of a sewn product after a free ring stitching by a blank stitching device of a conventional edge stitch machine.
FIG. 12 is a perspective view showing another example of a sewn product after an empty ring stitching by an empty ring stitching device of a conventional edge stitch machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Needle plate 2 Needle drop part 3 Stitch-forming claw part 3a Wide base end part 3b Sharp tip part 3c Curved outer edge 4 Knife for cutting the cloth edge 16 Fabric sensor 17 Empty ring cutting device 18 Empty ring retainer 19, 19 ' Empty ring guide device 22 V-shaped engagement portion 23 Empty ring pusher A Empty ring B Sewing fabric e Sewing start edge

Claims

針落ち部及びこの針落ち部を基端として縫製進行方向へ向けて突出形成された縫い目形成用爪部を有する針板と、
この針板上面への縫製生地の有無を検知し、縫製生地有のときミシン回転を許容する生地センサーと、
上記針板の縫い目形成用爪部に連なる空環を吸い込むとともに切断し、かつ、その切断後の空環を吸い込み方向とは逆方向へ吹き返す空環切り装置と、
この空環切り装置より吹き返された空環を受け取って吸入保持する第１位置とその空環の吸入保持状態で上記針板の縫い目形成用爪部の基端近くの手前部に設けられた生地端切断用メスの近傍位置へ後退して待機する第２位置とこの第２位置よりさらに縫製進行方向とは逆方向へ後退して空環を縫製生地の縫い始め端の縫い目中に引き込む第３位置とに亘って位置移動可能で、かつ、その第３位置において空環の吸入保持を解除可能に構成された空環保持器と、
この空環保持器の上記第３位置への移動に伴い縫製生地の縫い始め端の縫い目中に引き込まれる空環を上記生地端切断用メスの切断部に誘導する空環誘導装置とを備えた縁かがり縫いミシンの空環縫い込み装置において、
上記針板の縫い目形成用爪部は、針落ち部からの突出長さが５〜６．２ｍｍの範囲の長さに構成されているとともに、その基端が幅広で、先端が尖鋭であり、かつ、これら幅広基端と尖鋭先端とが縫製進行方向に対して傾斜する滑らかな曲線状の外側縁で結ばれて略三角形状に形成されており、
また、上記空環誘導装置は、空環に係合可能な略Ｖ字状の係合部を有する空環押し具と、この空環押し具を上記空環保持器の第２位置から第３位置への移動に連動して上記生地端切断用メスの切断部へ向けて進出移動させる伸縮駆動手段とから構成されており、
かつ、縫製生地が縫製進行方向に送られて、その縫い始め端縁から生地端切断用メスまでの寸法が所定長さとなる位置に達したとき、ミシンの回転が一旦、所定時間に亘って停止されると同時に、上記空環保持器が第２位置から第３位置に移動して上記第１位置で空環保持器に吸入保持された空環を針落ち部の手前側に引張り、その直後に上記空環誘導装置の空環押し具が生地端切断用メスの切断部へ向けて進出移動して余分な空環を生地端切断用メスの切断部に強制的に押し込み誘導し生地端と同時に切断し、その後、ミシンを通常縫製時の回転速度に復帰させて縫製生地を縫製進行方向へ送りながら空環を縫製生地の縫い始め端の縫い目中に引き込んで該縫い目中に縫い込むように構成していることを特徴とする縁かがり縫いミシンの空環縫い込み装置。A needle plate having a needle drop portion and a claw portion for forming a seam protruding toward the sewing progress direction with the needle drop portion as a base end;
A cloth sensor that detects the presence or absence of sewing cloth on the upper surface of the needle plate and allows sewing machine rotation when sewing cloth is present,
An empty ring cutting device that sucks and cuts the empty ring connected to the stitch forming claw portion of the needle plate, and blows back the empty ring after the cutting in the direction opposite to the suction direction;
A first position for receiving and holding the empty ring blown back from the empty ring cutting device, and a cloth provided in the front portion near the base end of the stitch forming claw portion of the needle plate in the suction holding state of the empty ring A second position for retreating to a position near the end cutting knife and waiting, and a third position for retreating in the direction opposite to the sewing progress direction from the second position and pulling the empty ring into the seam at the sewing start end of the sewing fabric. An empty ring retainer configured to be movable over a position, and configured to be capable of releasing the intake holding of the empty ring at the third position;
An empty ring guiding device for guiding an empty ring drawn into a seam at a sewing start end of the sewing fabric to the cutting portion of the cloth edge cutting knife as the empty ring retainer moves to the third position; In the edge stitch machine sewing machine,
The stitch forming claw portion of the needle plate is configured to have a length protruding from the needle drop portion in the range of 5 to 6.2 mm, the base end is wide, and the tip is sharp. And, the wide base end and the sharp tip are connected to each other by a smooth curved outer edge that is inclined with respect to the sewing progress direction, and is formed in a substantially triangular shape.
The empty ring guide device includes an empty ring pusher having a substantially V-shaped engaging portion engageable with the empty ring, and the empty ring pusher from a second position of the empty ring retainer to a third position. It is composed of an expansion / contraction drive means that moves forward toward the cutting portion of the knife for cutting the fabric edge in conjunction with the movement to the position,
When the sewing fabric is fed in the sewing progress direction and reaches the position where the dimension from the sewing start edge to the knife for cutting the fabric edge reaches a predetermined length, the rotation of the sewing machine is temporarily stopped for a predetermined time. at the same time the, the air-ring retainer is moved from the second position to the third position to pull the air ring sucked held emptied ring retainer to the front side of the needle portion in said first position, immediately The empty ring pusher of the empty ring guiding device moves forward toward the cutting portion of the knife for cutting the fabric edge and forcibly pushes the extra empty ring into the cutting portion of the knife for cutting the fabric edge to guide the cloth edge. simultaneously cut, then, as sewn into the seam Nde write pull the air ring while usually by returning the rotational speed at the time of sewing feed sewing fabric to the sewing direction of travel of the sewing machine during the sewing start end stitch of the sewing cloth empty overlock stitch sewing machine characterized in that it constitutes a Stitching apparatus.