JP3718801B2

JP3718801B2 - Sewing stitch forming method

Info

Publication number: JP3718801B2
Application number: JP2002082596A
Authority: JP
Inventors: 隆志藤倉; 弘志村谷; 孝仁柳本
Original assignee: Mikasa KK
Current assignee: Mikasa KK
Priority date: 2002-03-25
Filing date: 2002-03-25
Publication date: 2005-11-24
Anticipated expiration: 2022-03-25
Also published as: DE10312674B4; KR20030077385A; KR100470220B1; JP2003275483A; DE10312674A1; CN1446970A; CN100429344C

Description

【０００１】
【発明の属する技術分野】
本発明は、ミシンの縫い目形成方法に関し、特に競技用ボール等の皮革及びテント、帆布等の厚物縫製において、２枚の縫製素材の表側を合わせ、その端を縫合した後に、その縫合部を内側にして縫製素材を割り開いて使用する縫製素材の縫い目形成方法に関するものである。
【０００２】
【従来の技術】
サッカーボール等のボールや自動車シート、椅子等の家具のシートにおいては、縫い目に高負荷がかかり、縫い糸の緩み及びそれによる縫い目の割れ（開口)が生じやすいので、それを防ぐために、ボール業界では、２本糸による手縫いを行っているが、手作業は非常に効率が悪い。一方、自動車シート及び家具のシートでは、いまだ適切な対応がされていない。
【０００３】
皮革類やテント、帆布等をミシンによって縫製しようとすれば、２枚の縫製素材の表側を合わせ、その端を本縫い目ミシンにより縫合し、使用の際には、その縫合部を内側にして各縫製素材を割り開くことになる。
【０００４】
このときの縫合部の締結強度は、上糸、下糸のそれぞれの引っ張り強度と、上糸、下糸の結節点における摩擦力と、上糸、下糸と上布、下布との摩擦力とにより決定され、縫合部の締結強度は、いずれも一本の糸にかかることとなり、単一の糸の強度に依存する。また、縫合部を割り開くと、上糸、下糸の伸び、結節点の変形、上糸、下糸による上布、下布の圧縮が生ずる。
【０００５】
これらの諸現象により、縫合部を割り開くときに、上布と下布の縫合部における接触面が開き、上糸、下糸、あるいは両糸の結節点が表面に露出し、商品価値が低下する。
【０００６】
この問題点を解決するため、図１０に示す縫い目を連続形成する技術が提案されている（特願２００１−３１４２７６）。それは、本縫い目を形成するミシンにより、上布Ｆ１と下布Ｆ２を２針正送りして２つの縫い目を形成した後に、１針逆送りして１つの縫い目を形成することを繰り返すものである。
【０００７】
【発明が解決しようとする課題】
上記の方法によって形成されるミシンの縫い目は、逆送りから正送りに転じる針落ち位置で上糸Ａが捩じれるヒッチステッチＨとなり、且つ、生地が上糸Ａ、下糸Ｂそれぞれ糸３本で抑えられる。そのため、生地の圧接強度は改善され、縫い目の緩み、割れの発生は減少する。しかしながら、縫い目形成時に逆送りを伴うので、オペレータにとって布扱いがやりにくくなり、違和感を感じることになる。
【０００８】
本発明は、このような技術的な背景のもとに、上記問題点の解決を意図してなされたものであり、布送りの逆転をせずに、強固な縫い目を形成し得るミシンの縫い目形成方法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】
本発明のミシンの縫い目形成方法は、被縫製物側から見て左回りに回転する釜、針、針、被縫製物側から見て左回りに回転する釜を布送り方向に順に配置するとともに、前記一対の釜の中心線を結ぶ直線上に前記一対の針を配置したミシンにより、独立して形成される２つの縫い目がずれないように送り量を調整して被縫製物を１ピッチずつ送り、前記一対の釜の中心を結ぶ直線に沿って縫い目を形成し、どの縫合点にも２つの独立した縫い目を重ねて形成するものである（図１）。
【００１０】
本発明の他の縫い目形成方法は、布送り方向に沿って被縫製物側から見て左回りに回転する釜を２つ並べ、それらの間に一針毎に被縫製物を含む平面とほぼ平行な平面上において両側の釜の方向に１８０度の反転往復動を繰り返す２本の針を配したミシンにより、被縫製物を１ピッチずつ送り、２本の上糸と２本の下糸とにより縫い目を形成するものである（図３）。
【００１１】
本発明の他の縫い目形成方法は、布送り方向に沿って被縫製物側から見て左回りに回転する釜を２つ並べ、それらの間に一針毎に被縫製物を含む平面とほぼ平行な平面上において両側の釜の方向に１８０度の反転往復動を繰り返す２本の針を配したミシンにより、二針に一回被縫製物の送りを停止させることを繰り返し、２本の上糸と２本の下糸により縫い目を形成するものである（図５）。
【００１２】
本発明の他の縫い目形成方法は、被縫製物側から見て左回りに回転する釜、一針毎に被縫製物上で送り方向に沿って前後搖動する１本の針、被縫製物側から見て左回りに回転する釜を送り方向に沿って順に配置したミシンにより、二針に一回被縫製物の送りを停止させることを繰り返し、１本の上糸と２本の下糸により縫い目を形成するものである（図６）。
【００１３】
本発明の他の縫い目形成方法は、針落ち位置の右側あるいは左側に配置された１つの釜と、一針毎に被縫製物上で送り方向に沿って前後揺動する１本の針とを備えたミシンにより、二針に一回被縫製物の送りを停止させることを繰り返し、１本の上糸と１本の下糸により縫い目を形成するものである（図８）。
【００１４】
【発明の実施の形態】
図1及び図２を参照し、本発明のミシンの縫い目形成方法の第１実施形態について説明する。
【００１５】
この実施形態における縫い目は、縦２本針による本縫いであり、次のようなミシンによって形成される。
【００１６】
そのミシンは、従来の２本針ミシンに、針と釜の向きを送り方向に対して９０度回転させる改造を加えたものである。即ち、第１実施形態の縫い目形成方法を実施するミシンは、布送り方向に沿って、左回りに回転する釜Ｃ１、針Ｄ１、針Ｄ２、左回りに回転する釜Ｃ２を順に配置したものである。
【００１７】
先ず、不図示の送り量設定器によって、独立して形成される２つの縫い目がずれないように、上手の針Ｄ１と下手の針Ｄ２のそれぞれの位置における布送り量が等しくなるよう（縫製ピッチが等しくなるよう）に設定する。
【００１８】
上記のように布送り量を設定した後に、ミシンを駆動すると、図１に示す縫い目が連続形成される。次に、その縫い目について説明する。なお、何れの縫い目の図面においても、上糸、下糸が上布、下布から浮いた状態で描かれているが、実際には１針毎に強く糸締めされており、上糸、下糸は上布、下布に強く密着している。
【００１９】
ミシンが駆動して布Ｆ１、Ｆ２が正方向に送られると、送り方向上手の釜Ｃ１と針Ｄ１とにより（上糸Ａ１と下糸Ｂ１により）パーフェクトステッチＰが連続して形成され、同時に、下手の釜Ｃ２と針Ｄ２とにより（上糸Ａ２と下糸Ｂ２により）、その針と釜との位置関係からヒッチステッチ（捩じれた結節）Ｈが連続的に形成される。その際、上糸Ａ１と下糸Ｂ１によるパーフェクトステッチＰは、１ピッチ先行する上糸Ａ２と下糸Ｂ２によるヒッチステッチＨの上（同一縫合点）に後追いするように形成される。即ち、どの縫合点にもパーフェクトステッチＰとヒッチステッチＨが重なって存在する縫い目が形成される。
【００２０】
このようにして形成された縫い目は、１つの縫合点に１つのパーフェクトステッチＰと、結節力の強い１つのヒッチステッチＨとが形成され、且つ、布送りの１ピッチの間の、上布の上面、下布の下面のそれぞれに上糸又は下糸が２本渡り、上糸と上布及び下糸と下布との接触面における摩擦力が大きくなる（上、下布の圧接強度は可なり大きくなる）。従って、この縫い目により縫合した後に、縫合部を割り開いても、縫い目が緩んだり、上布と下布の接触面が割れることはない。
【００２１】
その上、ミシンの回転スピード(送りスピード)イコール縫製スピードとなるので、オペレータにとって何の違和感もない。また、従来の２本針ミシンに、針と釜の送り方向に対する向きを９０度回転させる改造を加えることにより、簡単に実施することができる。
【００２２】
図３及び図４を参照し、本発明のミシンの縫い目形成方法の第２実施形態について説明する。
【００２３】
この実施形態における縫い目は、縦２本針を前後に反転往復動させて形成する本縫いであり、次のようなミシンによって形成される。
【００２４】
そのミシンは、従来の２本針ミシンに、針と釜の向きを送り方向に対して９０度回転させ、２つの釜の間で、２本の針を備えた針棒を一針毎に１８０度の反転往復動を繰り返すように改造したものである。即ち、第２実施形態の縫い目形成方法を実施するミシンは、布送り方向に沿って左回りに回転する２つの釜Ｃ１、Ｃ２を並べ、それらの間に一針毎に１８０度の反転往復動を繰り返す、２本の針Ｄ１、Ｄ２を備えた針棒を配したものである。
【００２５】
先ず、不図示の送り量設定器によって、縫合点位置がずれないように、上手の針落ち位置と下手の針落ち位置における布送り量を、２本の針の間隔に合わせて設定する。
【００２６】
上記のように布送り量を設定した後に、ミシンを駆動すると、図３に示す縫い目が連続形成される。次に、その縫い目について説明する。
【００２７】
その縫い目は、２本の針と２個の釜との関係を交互に入れ替えながら形成される。即ち、一方の上糸Ａ１が送り方向上手の釜側に針落ちするときには、上手の釜側内の下糸Ｂ１と、パーフェクトステッチＰを形成すると共に、他方の上糸Ａ２が送り方向下手の釜側に針落ちし、下手の釜側内の下糸Ｂ２と、ヒッチステッチＨを形成する。布が１ピッチ正方向に送られ、同時に針の位置が反転すると、一方の上糸Ａ１は、既にパーフェクトステッチＰが形成されている布上の同じ位置で、下手側の釜内の下糸Ｂ２とヒッチステッチＨを形成し、他方の上糸Ａ２は、上手の釜内の下糸Ｂ１とパーフェクトステッチＰを形成する。このように、この縫い目は、同一縫合点に同じ針でパーフェクトＰとヒッチステッチＨが形成されるので、止め縫いと同等の効果が生じる。
【００２８】
このようにして形成された縫い目は、一針毎に止め縫い状態が形成される上に、上布の上面、下布の下面のそれぞれに上糸又は下糸が２本渡り、上糸と上布及び下糸と下布との接触面における摩擦力が大きくなる。従って、この縫い目により縫合した後に、縫合部を割り開いても、縫い目が緩んだり、上布と下布の接触面が割れることはない。
【００２９】
その上、ミシンの回転スピード(送りスピード)イコール縫製スピードとなるので、オペレータにとって何の違和感もない。また、従来の2本針ミシンに、針と釜の送り方向に対する向きを9０度回転させ、一針毎に針棒を１８０度反転往復動を繰り返す改造を加えることにより実施することができる。
【００３０】
図４及び図５を参照し、本発明のミシンの縫い目形成方法の第３実施形態について説明する。
【００３１】
この実施形態における縫い目も、縦２本針を前後に反転往復動させて形成する本縫いであり、次のようなミシンによって形成される。
【００３２】
そのミシンは、図４に示す実施態様２で使用したミシンに、更に、送りを二針に一回停止させるよう改造したものである。即ち、第３実施形態の縫い目形成方法を実施するミシンは、布送り方向に沿って左回りに回転する２つの釜Ｃ１、Ｃ２を並べ、それらの間に一針毎に１８０度の反転往復動を繰り返す、２本の針Ｄ１、Ｄ２を備えた針棒を配し、送りを二針に一回停止させるものである。
【００３３】
先ず、不図示の送り量設定器によって、縫合点位置がずれないように、上手の針落ち位置と下手の針落ち位置における布送り量を、２本の針の間隔に合わせて設定する。
【００３４】
上記のように布送り量を設定した後に、ミシンを駆動すると、図５に示す縫い目が連続形成される。次に、その縫い目について説明する。
【００３５】
その縫い目は、２本の針と２個の釜との関係を交互に入れ替えながら形成される。即ち、一方の上糸Ａ１が送り方向上手の釜側に針落ちするときには、上手の釜側内の下糸Ｂ１と、パーフェクトステッチＰを形成すると共に、他方の上糸Ａ２が送り方向下手の釜側に針落ちし、下手の釜側内の下糸Ｂ２と、ヒッチステッチＨを形成する。布が１ピッチ正方向に送られ、同時に針の位置が反転すると、一方の上糸Ａ１は、既にパーフェクトステッチＰが形成されている布上の同じ位置で、下手側の釜内の下糸Ｂ２とヒッチステッチＨを形成し、他方の上糸Ａ２は、上手の釜内の下糸Ｂ１とパーフェクトステッチＰを形成する。更に、布が１ピッチ正方向に送られ、同時に針の位置が反転すると、一方の上糸Ａ１は、上手側の釜内の下糸Ｂ１とパーフェクトステッチＰを形成し、他方の上糸Ａ２は、下手の釜内の下糸Ｂ２と、既にパーフェクトステッチＰが形成されている布上の同じ位置でヒッチステッチＨを形成する。そして、送りが停止され、同時に針の位置が反転すると、一方の上糸Ａ１は、直前に上糸Ａ２と下糸Ｂ２によりヒッチステッチＨが形成された位置で、下手の釜内の下糸Ｂ２とヒッチステッチＨを形成し、他方の上糸Ａ２は、直前に上糸Ａ１と下糸Ｂ１によりパーフェクトステッチＰが形成された位置で、上手側の釜内の下糸Ｂ１とパーフェクトステッチＰを形成する。このように、この縫い目は、同一縫合点に４つの結節点が存在し、且つ、そこに同じ針でパーフェクトＰとヒッチステッチＨが形成されるので、止め縫いと同等の効果が生じる。
【００３６】
このようにして形成された縫い目は、同一縫合点に４つの結節点が存在し、そこに止め縫い状態が形成される上に、上布の上面に上糸が４本渡り、下布の下面に下糸が２本渡るので、上糸と上布及び下糸と下布との接触部における摩擦力が大きくなる。従って、この縫い目により縫合した後に、縫合部を割り開いても、縫い目が緩んだり、上布と下布の接触面が割れることはない。
【００３７】
その上、縫製スピードはミシンの回転スピード(送りスピード)よりも遅くはなるが、送り方向の反転がないので、オペレータにとって何の違和感もない。また、従来の２本針ミシンに、針と釜の送り方向に対する向きを9０度回転させ、一針毎に針棒を１８０度反転往復動を繰り返すようにし、送りを二針に一回停止させる改造を加えることにより実施することができる。
【００３８】
図６及び図７を参照し、本発明のミシンの縫い目形成方法の第４実施形態について説明する。
【００３９】
この実施形態における縫い目は、次のような千鳥タイプ針振方式ミシンによって形成される。
【００４０】
そのミシンは、従来の千鳥縫いミシンに、釜と針振りの、送り方向に対する向きを９０度回転させ、送りを二針に一回停止させる改造を加えたものである。即ち、第４実施形態の縫い目形成方法を実施するミシンは、布送り方向に沿って、左回りに回転する釜Ｃ１、一針毎に布上で送りと同方向に揺動する針（千鳥の針振りを送り方向と同方向にしたもの）Ｄ、左回りに回転する釜（内掬い釜）Ｃ２を順に配置し、送りを二針に一回停止させるものである。
【００４１】
先ず、縫合点位置がずれないように、不図示の送り調節器によって送り量と針振り量を同等に合わせ、その針振り量に合わせて釜位置を同時に調整する。
【００４２】
上記の調整を行った後に、ミシンを駆動すると、２本の下糸Ｙ１、Ｙ２と１本の上糸Ｙにより、図６に示すような縫い目が連続形成される。次に、その縫い目について説明する。
【００４３】
ミシンが駆動され、針Ｄが送り方向上手の釜Ｃ１側に落ちると、上糸Ａは、その釜内の下糸Ｂ１とヒッチステッチＨを形成する。そして、針Ｄが布上に上昇して送り方向に振れ、再度針Ｄが下降して下手の釜Ｃ２側で下糸Ｂ２とパーフェクトステッチＰを形成し、更に、針Ｄが布上に上昇して送りと反対方向に振れると共に布が１ピッチ送られ、再度針Ｄが下降して下糸Ｂ１とヒッチステッチＨを形成する。そして、送りが停止した状態で針Ｄが布上に上昇して送り方向に振れ、再度針Ｄが下降して下糸Ｂ２とパーフェクトステッチＰを形成する。以後この動作が連続して繰り返され、パーフェクトステッチＰとヒッチステッチＨが各縫合点に形成される。
【００４４】
このようにして形成された縫い目は、１つの縫合点にパーフェクトヒッチＰとヒッチステッチＨがそれぞれ１個づつ存在し、上糸一本により締め上げる状態となると共に、上布の上面が３本の上糸で抑えら、下布が２本の下糸で抑えられるので、上糸と上布及び下糸と下布との接触面における摩擦力が大きくなる（上、下布の圧接強度は可なり大きくなる）。従って、この縫い目により縫合した後に、縫合部を割り開いても、縫い目が緩んだり、上布と下布の接触面が割れることはない。
【００４５】
その上、縫製スピードはミシンの回転スビード(送りスピード)よりも遅くなるが、送り方向の反転がないので、オペレータにとって何の違和感もない。また、従来の千鳥縫いミシンに、釜と針振りの、送り方向に対する向きを９０度回転させ、送りを二針に一回停止させる改造を加えることにより、実施することができる。
【００４６】
図８及び図９を参照し、本発明のミシンの縫い目形成方法の第５実施形態について説明する。
【００４７】
この実施形態における縫い目は、次のような千鳥タイプ針振り方式ミシンによって形成される。
【００４８】
そのミシンは、従来の１本針ミシンに、送りと同方向に針振りを行うようにし(千鳥の針振りを送り方向と同方向にした構造)、送りを二針に一回停止させる改造を加えたものである。即ち、第５実施形態の縫い目形成方法を実施するミシンは、送り方向から見て、針落ちの右側あるいは左側に１個の釜Ｃを配置し、１本の針Ｄを一針毎に布上で送り方向に揺動させると共に、二針に一回送りを停止させ、１本の上糸と１本の下糸により縫い目を形成するものである。
【００４９】
先ず、針振りの前後で釜Ｄが上糸を掬える範囲に針振り量を設定すると共に、縫合点がずれないように不図示の送り調節器によって送り量を針振り量と同等に調整する。
【００５０】
上記の設定を行った後にミシンを駆動すると、図８に示すような縫い目が連続形成される。次に、その縫い目について説明する。
【００５１】
ミシンが駆動され、針Ｄが送り方向上手に落ちると、上糸Ａは下糸ＢとヒッチステッチＨを形成する。そして、針Ｄが布上に上昇して送り方向に振れ、再度針Ｄが下降して下手側で下糸ＢとパーフェクトステッチＰを形成し、更に、針Ｄが布上に上昇して送りと反対方向に振れると共に布が１ピッチ送られ、再度針Ｄが下降して上手側で下糸ＢとヒッチステッチＨを形成する。そして、送りが停止した状態で針Ｄが布上に上昇して送り方向に振れ、再度針Ｄが下降して下手側で下糸ＢとパーフェクトＰを形成する。以後この動作が連続して繰り返され、各縫合点にパーフェクトＰとヒッチステッチＨをそれぞれ１個づつ備えた縫い目が形成される。
【００５２】
このようにして形成された縫い目は、１つの縫合点にパーフェクトステッチＰとヒッチステッチＨがそれぞれ１個づつ形成され、上糸と下糸によってしっかりと締め上げる状態となると共に、どの縫い目も上、下とも３本の糸で三重に抑えられるので、上糸と上布及び下糸と下布との接触面における摩擦力が大きくなる。従って、この縫い目により縫合した後に、縫合部を割り開いても、縫い目が緩んだり、上布と下布の接触面が割れることはない。
【００５３】
その上、縫製スピードはミシンの回転スビード(送りスピード)よりも遅くなるが、送り方向の反転がないので、オペレータにとって何の違和感もない。また、従来の千鳥縫いミシンに、送りと同方向に針振りを行い、送りを二針に一回停止させるよう改造することにより、実施することができる。
【００５４】
なお、本発明は実施形態にのみ限定されるものではなく、その本質から逸脱しない範囲で他の変形態様をとることができる。
【００５５】
【発明の効果】
以上説明したように本発明のミシンの縫い目形成方法は、同一縫合点にパーフェクトステッチと結節力の強いヒッチステッチとが形成され、場合によっては両結節が同じ針により形成されて止め縫い状態となり、且つ、上布の上面及び下布の下面に複数本の上糸又は下糸が渡り、上布と下布の圧接強度が大きくなるので、縫合部を割り開いても、縫い目が緩んだり、上布と下布の接触面が割れることはない。
【００５６】
その上、送り方向の反転がないので、オペレータにとって何の違和感もないし、縫製スピードも確保できる。また、既存のミシンに僅かな改良を加えたミシンにより実施することが可能である。
【図面の簡単な説明】
【図１】本発明の第１実施態様の縫い目を示す断面図である。
【図２】本発明の第１実施態様で使用するミシンの釜部の概略平面図である。
【図３】本発明の第２実施態様の縫い目を示す断面図である。
【図４】本発明の第２、第３実施態様で使用するミシンの釜部の概略平面図である。
【図５】本発明の第３実施態様の縫い目を示す断面図である。
【図６】本発明の第４実施態様の縫い目を示す断面図である。
【図７】本発明の第４実施態様で使用するミシンの釜部の概略平面図である。
【図８】本発明の第５実施態様の縫い目を示す断面図である。
【図９】本発明の第５実施態様で使用するミシンの釜部の概略平面図である。
【図１０】従来の形成方法による縫い目の断面図である。
【符号の説明】
Ａ上糸
Ａ１上糸
Ａ２上糸
Ｂ下糸
Ｂ１下糸
Ｂ２下糸
Ｃ釜
Ｃ１釜
Ｃ２釜
Ｄ針
Ｄ１針
Ｄ２針
Ｆ１上布
Ｆ２下布
Ｈヒッチステッチ
Ｐパーフェクトステッチ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a seam of a sewing machine, and in particular, in sewing leather such as a game ball and thick material such as a tent and a canvas, the front sides of two sewing materials are aligned, and the ends are sewn, and then the stitched portion is The present invention relates to a method for forming a seam of a sewing material that is used by splitting the sewing material inside.
[0002]
[Prior art]
In the ball industry such as soccer balls and furniture seats such as automobile seats and chairs, a high load is applied to the seams, and the thread is likely to loosen and cracks (openings). Although hand-sewing is performed with two threads, manual work is very inefficient. On the other hand, appropriate measures have not yet been taken for automobile seats and furniture seats.
[0003]
If you want to sew leather, tents, canvas, etc. with a sewing machine, align the front side of the two pieces of sewing material, sew the end with a seam sewing machine, and use each stitching part inside. The sewing material will be split open.
[0004]
The fastening strength of the stitching part at this time includes the tensile strength of the upper thread and lower thread, the frictional force at the knot of the upper thread and lower thread, and the frictional force between the upper thread, lower thread and upper cloth, and lower cloth. The fastening strength of the stitched portion is applied to a single thread and depends on the strength of a single thread. Further, when the stitching portion is split open, the upper thread and the lower thread are stretched, the knot point is deformed, and the upper and lower cloths are compressed by the upper thread and the lower thread.
[0005]
Due to these phenomena, when the stitched portion is split open, the contact surface at the stitched portion of the upper and lower fabrics opens, and the knots of the upper thread, lower thread, or both threads are exposed on the surface, reducing the commercial value. To do.
[0006]
In order to solve this problem, a technique for continuously forming the seams shown in FIG. 10 has been proposed (Japanese Patent Application No. 2001-314276). That is, the sewing machine that forms the main stitch repeatedly repeats the upper cloth F1 and the lower cloth F2 by two stitches forward to form two stitches, and then reversely feeds one stitch to form one stitch. .
[0007]
[Problems to be solved by the invention]
The stitches of the sewing machine formed by the above method are hitch stitches H in which the upper thread A is twisted at the needle drop position where the reverse feed is changed to the forward feed, and the fabric is composed of three threads of the upper thread A and the lower thread B. It can be suppressed. Therefore, the press-contact strength of the fabric is improved, and the occurrence of loose seams and cracks is reduced. However, since reverse feed is accompanied at the time of forming the seam, it is difficult for the operator to handle the cloth, and the user feels uncomfortable.
[0008]
The present invention has been made in view of the above technical background with the intention of solving the above-described problems, and the stitches of the sewing machine capable of forming a strong seam without reversing the cloth feed. The object is to provide a forming method.
[0009]
[Means for Solving the Problems]
Stitch forming method of the sewing machine of the present invention, hook to rotate counterclockwise as viewed from the workpiece side, the needle, the needle, together with the hook to rotate counterclockwise as viewed from the workpiece side are disposed in this order in the cloth feeding direction The sewing machine in which the pair of needles are arranged on a straight line connecting the center lines of the pair of hooks adjusts the feed amount so that the two stitches formed independently are not shifted, and each workpiece to be sewn is one pitch at a time. A seam is formed along a straight line connecting the centers of the pair of hooks, and two independent seams are overlapped at each stitching point (FIG. 1).
[0010]
According to another stitch forming method of the present invention, two hooks that rotate counterclockwise when viewed from the side to be sewn along the cloth feeding direction are arranged, and a plane including the item to be sewn is arranged between each hook. A sewing machine with two needles that repeats reciprocating reciprocation of 180 degrees in the direction of the hooks on both sides on a parallel plane feeds the workpiece one pitch at a time, and two upper threads and two lower threads Thus, a seam is formed (FIG. 3).
[0011]
According to another stitch forming method of the present invention, two hooks that rotate counterclockwise when viewed from the side to be sewn along the cloth feeding direction are arranged, and a plane including the item to be sewn is arranged between each hook. On the parallel plane, the sewing machine with two needles that repeat the reciprocating reciprocation of 180 degrees in the direction of the hooks on both sides repeatedly stops the feed of the workpiece once in two needles. A seam is formed by a thread and two lower threads (FIG. 5).
[0012]
Another stitch forming method of the present invention includes a hook that rotates counterclockwise as viewed from the sewing product side , one needle that swings back and forth along the feed direction on the sewing product for each stitch , and the sewing product side. The sewing machine in which the hooks that rotate counterclockwise as viewed from the sewing machine are arranged in order along the feed direction, and repeatedly stops the feed of the workpiece once in two stitches, with one upper thread and two lower threads A seam is formed (FIG. 6).
[0013]
According to another stitch forming method of the present invention, one hook disposed on the right or left side of the needle drop position and one needle that swings back and forth along the feed direction on the sewing product for each stitch. The sewing machine is provided to repeatedly stop the feed of the sewing object once in two needles, and a seam is formed by one upper thread and one lower thread (FIG. 8).
[0014]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1 and FIG. 2, a description will be given of a first embodiment of a sewing machine seam forming method according to the present invention.
[0015]
The seam in this embodiment is a main stitch with two vertical needles and is formed by the following sewing machine.
[0016]
The sewing machine is a conventional two-needle sewing machine with a modification in which the direction of the needle and the shuttle is rotated 90 degrees with respect to the feed direction. That is, the sewing machine that performs the seam forming method according to the first embodiment is configured by sequentially arranging a hook C1 that rotates counterclockwise, a needle D1, a needle D2, and a hook C2 that rotates counterclockwise along the cloth feeding direction. is there.
[0017]
First, the cloth feed amount at each position of the upper needle D1 and the lower needle D2 is made equal (sewing pitch) so that the two stitches formed independently are not shifted by a feed amount setting unit (not shown). To be equal).
[0018]
When the sewing machine is driven after setting the cloth feed amount as described above, the seams shown in FIG. 1 are continuously formed. Next, the seam will be described. In each drawing of the seam, the upper thread and the lower thread are drawn in a state of floating from the upper and lower cloths. The yarn is firmly attached to the upper and lower fabrics.
[0019]
When the sewing machine is driven and the fabrics F1 and F2 are fed in the forward direction, a perfect stitch P is continuously formed by the hook C1 and the needle D1 (upper thread A1 and lower thread B1) in the feeding direction, A hitch stitch (twisted knot) H is continuously formed from the positional relationship between the needle and the hook by the lower hook C2 and the needle D2 (by the upper thread A2 and the lower thread B2). At that time, the perfect stitch P formed by the upper thread A1 and the lower thread B1 is formed so as to follow the hitch stitch H (the same stitching point) formed by the upper thread A2 and the lower thread B2 preceding one pitch. That is, a seam in which the perfect stitch P and the hitch stitch H overlap each other is formed.
[0020]
The seam formed in this way is formed with one perfect stitch P and one hitch stitch H having a strong knotting force at one stitching point, and the upper fabric between one pitch of the cloth feed. Two upper yarns or lower yarns cross on each of the upper surface and the lower surface of the lower fabric, and the frictional force at the contact surface between the upper yarn and the upper fabric and between the lower yarn and the lower fabric increases (the pressure contact strength of the upper and lower fabrics is acceptable). Will become bigger). Therefore, even if the stitching portion is split open after stitching with the stitches, the stitches are not loosened and the contact surface between the upper fabric and the lower fabric is not broken.
[0021]
In addition, since the sewing machine rotational speed (feed speed) is equal to the sewing speed, there is no sense of incongruity for the operator. In addition, the conventional two-needle sewing machine can be easily implemented by adding a modification that rotates the direction of the needle and the hook relative to the feed direction by 90 degrees.
[0022]
With reference to FIG. 3 and FIG. 4, a second embodiment of the sewing machine seam forming method of the present invention will be described.
[0023]
The seam in this embodiment is a main stitch formed by reciprocating the vertical two needles back and forth, and is formed by the following sewing machine.
[0024]
The sewing machine is a conventional two-needle sewing machine in which the direction of the needle and shuttle is rotated 90 degrees with respect to the feed direction, and a needle bar with two needles is rotated 180 degrees between the two shuttles. It has been modified to repeat the reciprocating reciprocal motion. That is, the sewing machine that performs the seam forming method of the second embodiment has two hooks C1 and C2 that rotate counterclockwise along the cloth feeding direction, and a reciprocating reciprocating motion of 180 degrees for each stitch between them. The needle bar provided with two needles D1 and D2 is arranged.
[0025]
First, the cloth feed amount at the upper needle drop position and the lower needle drop position is set according to the interval between the two needles so that the stitching point position is not shifted by a feed amount setting unit (not shown).
[0026]
When the sewing machine is driven after setting the cloth feed amount as described above, the stitches shown in FIG. 3 are continuously formed. Next, the seam will be described.
[0027]
The seam is formed by alternately switching the relationship between the two needles and the two hooks. That is, when one upper thread A1 is needle-dropped toward the upper hook side in the feed direction, the lower thread B1 in the upper hook side and the perfect stitch P are formed, and the other upper thread A2 is the lower hook in the feed direction. The needle falls to the side, and the lower thread B2 in the lower hook side and the hitch stitch H are formed. When the cloth is fed forward by 1 pitch and the needle position is reversed at the same time, one upper thread A1 is the same position on the cloth where the perfect stitch P has already been formed, and the lower thread B2 in the lower hook. The other upper thread A2 forms a perfect stitch P with the lower thread B1 in the upper hook. In this manner, since the perfect P and the hitch stitch H are formed with the same needle at the same stitching point, this seam has the same effect as the backstitch.
[0028]
The stitches formed in this way are formed in a stitched state for each stitch, and two upper threads or lower threads are crossed on each of the upper surface of the upper cloth and the lower surface of the lower cloth. The frictional force at the contact surface between the cloth and the lower thread and the lower cloth is increased. Therefore, even if the stitching portion is split open after stitching with the stitches, the stitches are not loosened and the contact surface between the upper fabric and the lower fabric is not broken.
[0029]
In addition, since the sewing machine rotational speed (feed speed) is equal to the sewing speed, there is no sense of incongruity for the operator. Further, the conventional two-needle sewing machine can be implemented by remodeling the needle and the shuttle with respect to the feeding direction by 90 degrees and reversing the needle bar by 180 degrees and reciprocatingly reciprocating for each needle.
[0030]
With reference to FIG.4 and FIG.5, 3rd Embodiment of the stitch formation method of the sewing machine of this invention is described.
[0031]
The seam in this embodiment is also a main stitch formed by reversing and reciprocating the vertical two needles back and forth, and is formed by the following sewing machine.
[0032]
The sewing machine is a modification of the sewing machine used in Embodiment 2 shown in FIG. 4 so that the feeding is stopped once with two needles. That is, the sewing machine that performs the stitch forming method of the third embodiment has two hooks C1 and C2 that rotate counterclockwise along the cloth feeding direction, and a reciprocating reciprocating motion of 180 degrees for each stitch between them. The needle bar provided with two needles D1 and D2 is arranged, and the feed is stopped once for two needles.
[0033]
First, the cloth feed amount at the upper needle drop position and the lower needle drop position is set according to the interval between the two needles so that the stitching point position is not shifted by a feed amount setting unit (not shown).
[0034]
When the sewing machine is driven after setting the cloth feed amount as described above, the stitches shown in FIG. 5 are continuously formed. Next, the seam will be described.
[0035]
The seam is formed by alternately switching the relationship between the two needles and the two hooks. That is, when one upper thread A1 is needle-dropped toward the upper hook side in the feed direction, the lower thread B1 in the upper hook side and the perfect stitch P are formed, and the other upper thread A2 is the lower hook in the feed direction. The needle falls to the side, and the lower thread B2 in the lower hook side and the hitch stitch H are formed. When the cloth is fed forward by 1 pitch and the needle position is reversed at the same time, one upper thread A1 is the same position on the cloth where the perfect stitch P has already been formed, and the lower thread B2 in the lower hook. The other upper thread A2 forms a perfect stitch P with the lower thread B1 in the upper hook. Furthermore, when the cloth is fed forward by 1 pitch and the needle position is reversed at the same time, one upper thread A1 forms a perfect stitch P with the lower thread B1 in the upper hook, and the other upper thread A2 The hitch stitch H is formed at the same position on the lower thread B2 in the lower hook and the cloth on which the perfect stitch P has already been formed. When the feeding is stopped and the needle position is reversed at the same time, one upper thread A1 is located immediately before the hitch stitch H is formed by the upper thread A2 and the lower thread B2, and the lower thread B2 in the lower hook. The other upper thread A2 forms the perfect stitch P with the lower thread B1 in the upper hook at the position where the perfect stitch P was formed by the upper thread A1 and the lower thread B1 immediately before. To do. In this way, since this stitch has four knot points at the same stitch point, and the perfect needle and hitch stitch H are formed there by the same needle, the same effect as the back stitch is produced.
[0036]
The stitches formed in this way have four knots at the same stitching point, in which a stitched state is formed, and four upper threads cross on the upper surface of the upper fabric, and the lower surface of the lower fabric Since two lower threads pass over the upper surface, the frictional force at the contact portion between the upper thread and the upper cloth and between the lower thread and the lower cloth increases. Therefore, even if the stitching portion is split open after stitching with the stitches, the stitches are not loosened and the contact surface between the upper fabric and the lower fabric is not broken.
[0037]
In addition, the sewing speed is slower than the rotational speed (feed speed) of the sewing machine, but since there is no reversal of the feed direction, there is no sense of incongruity for the operator. Also, rotate the needle and shuttle in the conventional two-needle sewing machine by 90 degrees, and repeat the needle bar 180 degree reciprocating reciprocating motion for each needle, and stop feeding once by two needles. This can be done by adding modifications.
[0038]
With reference to FIG.6 and FIG.7, 4th Embodiment of the stitch formation method of the sewing machine of this invention is described.
[0039]
The seam in this embodiment is formed by the following staggered type waving type sewing machine.
[0040]
The sewing machine is a modification of the conventional zigzag stitch sewing machine, in which the direction of the hook and needle swing with respect to the feed direction is rotated 90 degrees and the feed is stopped once with two stitches. That is, the sewing machine that performs the stitch formation method of the fourth embodiment is a hook C1 that rotates counterclockwise along the cloth feed direction, and a needle that swings in the same direction as the feed on the cloth for each stitch (staggered A needle swing is made in the same direction as the feed direction) D, and a hook (inner scoop) C2 that rotates counterclockwise is arranged in order, and feed is stopped once in two needles.
[0041]
First, the feed amount and the needle swing amount are adjusted to be equal by a feed adjuster (not shown) so that the stitching point position does not shift, and the shuttle position is simultaneously adjusted according to the needle swing amount.
[0042]
When the sewing machine is driven after performing the above adjustment, a seam as shown in FIG. 6 is continuously formed by two lower threads Y1, Y2 and one upper thread Y. Next, the seam will be described.
[0043]
When the sewing machine is driven and the needle D falls to the hook C1 on the upper side in the feeding direction, the upper thread A forms a hitch stitch H with the lower thread B1 in the hook. Then, the needle D rises on the cloth and swings in the feeding direction, and the needle D descends again to form the lower thread B2 and the perfect stitch P on the lower hook C2 side. Further, the needle D rises on the cloth. Then, the fabric is fed one pitch and the needle D is lowered again to form the lower thread B1 and the hitch stitch H. Then, with the feed stopped, the needle D rises on the cloth and swings in the feed direction, and the needle D descends again to form the lower thread B2 and the perfect stitch P. Thereafter, this operation is continuously repeated to form a perfect stitch P and a hitch stitch H at each stitch point.
[0044]
The stitches thus formed have one perfect hitch P and one hitch stitch H at one stitch point, and are tightened by one upper thread, and the upper surface of the upper fabric has three stitches. Since the lower cloth is held down by two lower threads, the friction force at the contact surface between the upper thread and the upper cloth and between the lower thread and the lower cloth is increased (the pressure contact strength of the upper and lower cloth is acceptable). Will become bigger). Therefore, even if the stitching portion is split open after stitching with the stitches, the stitches are not loosened and the contact surface between the upper fabric and the lower fabric is not broken.
[0045]
In addition, the sewing speed is slower than the rotational speed (feed speed) of the sewing machine, but since there is no reversal of the feed direction, there is no sense of incongruity for the operator. Further, it can be carried out by adding a modification to the conventional zigzag sewing machine by rotating the direction of the shuttle and the needle swing with respect to the feed direction by 90 degrees and stopping the feed once by two stitches.
[0046]
With reference to FIG.8 and FIG.9, 5th Embodiment of the stitch formation method of the sewing machine of this invention is described.
[0047]
The seam in this embodiment is formed by the following staggered type needle swing type sewing machine.
[0048]
The sewing machine is modified so that the needle swings in the same direction as the feed (a structure in which the staggered needle swing is in the same direction as the feed direction), and the feed is stopped once with two needles. It is added. That is, in the sewing machine that performs the stitch forming method of the fifth embodiment, one hook C is arranged on the right or left side of the needle drop when viewed from the feeding direction, and one needle D is placed on the cloth for each stitch. In addition to swinging in the feed direction, the feed is stopped once by two needles, and a seam is formed by one upper thread and one lower thread.
[0049]
First, the needle swing amount is set in a range in which the hook D holds the upper thread before and after the needle swing, and the feed amount is adjusted to be equal to the needle swing amount by a feed controller (not shown) so that the stitching point does not shift. .
[0050]
When the sewing machine is driven after performing the above setting, the seam as shown in FIG. 8 is continuously formed. Next, the seam will be described.
[0051]
When the sewing machine is driven and the needle D falls down in the feeding direction, the upper thread A forms a lower thread B and a hitch stitch H. Then, the needle D rises on the cloth and swings in the feeding direction, the needle D descends again to form the lower thread B and the perfect stitch P on the lower side, and further, the needle D rises on the cloth and feeds. While swinging in the opposite direction, the cloth is fed by 1 pitch, and the needle D descends again to form the lower thread B and the hitch stitch H on the upper side. Then, with the feed stopped, the needle D rises on the cloth and swings in the feed direction, and the needle D descends again to form the lower thread B and the perfect P on the lower side. Thereafter, this operation is continuously repeated to form a stitch having one perfect P and one hitch stitch H at each stitch point.
[0052]
The stitches formed in this manner are formed with one perfect stitch P and one hitch stitch H at one stitching point, and are firmly tightened by the upper thread and the lower thread. Since the lower part is held in triplicate by three threads, the frictional force at the contact surface between the upper thread and the upper cloth and between the lower thread and the lower cloth is increased. Therefore, even if the stitching portion is split open after stitching with the stitches, the stitches are not loosened and the contact surface between the upper fabric and the lower fabric is not broken.
[0053]
In addition, the sewing speed is slower than the rotational speed (feed speed) of the sewing machine, but since there is no reversal of the feed direction, there is no sense of incongruity for the operator. In addition, the conventional zigzag stitching machine can be implemented by remodeling so that the needle swings in the same direction as the feed and the feed is stopped once by two stitches.
[0054]
In addition, this invention is not limited only to embodiment, Other deformation | transformation aspects can be taken in the range which does not deviate from the essence.
[0055]
【The invention's effect】
As described above, the stitch formation method of the sewing machine according to the present invention is such that a perfect stitch and a hitch stitch having a strong knotting force are formed at the same stitching point, and in some cases, both knots are formed by the same needle and become a stop stitch state. In addition, multiple upper threads or lower threads cross over the upper surface and the lower surface of the upper fabric, and the pressure contact strength between the upper fabric and the lower fabric increases. The contact surface between the cloth and the lower cloth will not break.
[0056]
In addition, since there is no reversal of the feeding direction, there is no sense of incongruity for the operator and the sewing speed can be secured. Further, it can be carried out by a sewing machine obtained by slightly improving an existing sewing machine.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a seam according to a first embodiment of the present invention.
FIG. 2 is a schematic plan view of a hook portion of a sewing machine used in the first embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a seam according to a second embodiment of the present invention.
FIG. 4 is a schematic plan view of a hook portion of a sewing machine used in the second and third embodiments of the present invention.
FIG. 5 is a cross-sectional view showing a seam according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a seam according to a fourth embodiment of the present invention.
FIG. 7 is a schematic plan view of a hook portion of a sewing machine used in the fourth embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a seam according to a fifth embodiment of the present invention.
FIG. 9 is a schematic plan view of a hook portion of a sewing machine used in the fifth embodiment of the present invention.
FIG. 10 is a cross-sectional view of a seam formed by a conventional forming method.
[Explanation of symbols]
A Upper thread A1 Upper thread A2 Upper thread B Lower thread B1 Lower thread B2 Lower thread C Hook C1 Hook C2 Hook D Needle D1 Needle D2 Needle F1 Upper cloth F2 Lower cloth H Hitch stitch P Perfect stitch

Claims

A hook that rotates counterclockwise when viewed from the side to be sewn, a needle, a needle, and a hook that rotates counterclockwise when viewed from the side to be sewn are sequentially arranged in the cloth feed direction, and the center lines of the pair of hooks are connected. With the sewing machine in which the pair of needles are arranged on a straight line , the feed amount is adjusted so that two independently formed seams are not displaced, and the workpiece is fed one pitch at a time, and the center line of the pair of hooks is adjusted. A method for forming a seam of a sewing machine , in which a seam is formed along a straight line, and two independent seams are overlapped at each stitching point .

Two hooks that rotate counterclockwise as viewed from the sewing product side along the cloth feed direction are arranged, and the directions of the hooks on both sides on a plane substantially parallel to the plane containing the sewing product for each stitch between them A sewing method for forming a stitch on a sewing machine in which a sewing machine is provided with two needles that repeat reversing and reciprocating movements of 180 degrees at the same time, and a workpiece is fed one pitch at a time to form a seam with two upper threads and two lower threads. .

Two hooks that rotate counterclockwise as viewed from the sewing product side along the cloth feed direction are arranged, and the directions of the hooks on both sides on a plane substantially parallel to the plane containing the sewing product for each stitch between them The sewing machine with two needles that repeats 180 degree reciprocating reciprocating motion repeatedly stops the feed of the workpiece once in two needles, and repeats the stitches with two upper threads and two lower threads. A method for forming a seam of a sewing machine to be formed.

A hook that rotates counterclockwise when viewed from the sewing product side, one needle that swings back and forth along the feed direction on the sewing product for each stitch, and a hook that rotates counterclockwise when viewed from the sewing product side A stitch forming method for a sewing machine in which a sewing machine arranged in order along a feeding direction repeatedly stops the feeding of a workpiece once by two needles and forms a seam with one upper thread and two lower threads.

The sewing machine is equipped with one hook placed on the right or left side of the needle entry position and one needle that swings back and forth along the feed direction on the workpiece for each stitch. A method for forming a stitch on a sewing machine, in which the feeding of a sewing product is repeatedly stopped to form a stitch with one upper thread and one lower thread.