JP2004065323A - Thread guide device to thread guide, and sewing machine equipped with the thread guide device - Google Patents

Thread guide device to thread guide, and sewing machine equipped with the thread guide device Download PDF

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JP2004065323A
JP2004065323A JP2002225246A JP2002225246A JP2004065323A JP 2004065323 A JP2004065323 A JP 2004065323A JP 2002225246 A JP2002225246 A JP 2002225246A JP 2002225246 A JP2002225246 A JP 2002225246A JP 2004065323 A JP2004065323 A JP 2004065323A
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thread
yarn
hook
guide
cassette
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JP3797292B2 (en
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Masayuki Hori
堀　正幸
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Brother Industries Ltd
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Brother Industries Ltd
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Priority to JP2002225246A priority Critical patent/JP3797292B2/en
Priority to CN031525164A priority patent/CN1480577B/en
Priority to US10/631,717 priority patent/US6957617B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform a preparation work for sewing by placing a thread to a thread guide of a needle bar as well right after placing the thread in an eye of a sewing needle. <P>SOLUTION: This thread guide device is equipped with a hook member 123 which can move between a standby location wherein a needle thread 11 led out from a thread cassette is not placed on a thread guide hook 123a, and an operating location wherein the thread can be placed, and an operating force adding member 124 which adds an operating force for switching the hook member 123 between the standby location and operating location. Then, a thread guide mechanism is constituted in such a manner that the needle thread 11 is placed on a first thread guide 19 at a lower part of a needle bar 12 and on a second thread guide 20 being away by a specified distance from the first thread guide 19 by switching the hook member 123 between the standby location and the operating location by the operating force being applied to the operating force adding member 124 from the thread cassette while being operated associated with the fitting motion of the thread cassette. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】本発明は、糸案内への糸掛け装置及びこの糸掛け装置を備えたミシンにおいて、特に、針棒の下部の糸案内へ自動的に糸掛けすることが可能に構成したものに関する。
【０００２】
【従来の技術】従来より、ミシンの針棒には、天秤から縫針の目孔に至る糸が針棒に沿うように案内する為の糸案内が設けられていることが多く、針棒の下端部に支持された縫針の目孔への糸通しを行う前に、この糸案内に糸を掛ける必要がある。ここで、近年では、糸通し動作を自動的に行うように構成された種々のミシンが提案され、あるいは実用化されているが、これらのミシンにおいても、自動的に糸通しを行う前の糸案内への糸掛け作業については、作業者自らの手作業により行われていた。
【０００３】
【発明が解決しようとする課題】しかし、縫製の準備において、針棒の停止位置によっては、糸案内がミシン頭部に極めて接近していることがある。例えば、ミシンに糸通し装置が備えられているか否かに関わらず、縫針の目孔へ糸を通す為には、針棒が最上位置に近い位置にある必要があるため、縫針の上側に設けられている糸案内はミシン頭部に接近した状態となる。若しくは、縫針とベッド部との間で布を出し入れするために針棒を上昇させたときにも、糸案内がミシン頭部に接近した状態となる。この接近状態では、作業者が糸案内を見づらかったり、あるいは、糸案内とミシン頭部との隙間が狭いために、作業者が糸案内に糸を掛けることは困難である。また、糸通しや布の出入の完了後にわざわざ針棒の位置を下げてから糸案内に糸を掛けるのは余計な手間がかかり、作業効率の低下を招く。
【０００４】
本発明の目的は、糸カセットの装着に伴い、糸案内への糸掛け動作を自動的に行うようにして縫製の準備作業を効率よく行うことである。
【０００５】
【課題を解決するための手段】請求項１の糸案内への糸掛け装置は、糸供給源を収容し且つミシンのカセット装着部に着脱可能に装着される糸カセットと、縫針を支持する針棒の下部の第１糸案内とを備えたミシンの糸案内への糸掛け装置であって、糸掛けフックを有し、この糸掛けフックに前記糸カセットから導出された糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、前記糸カセットの装着動作に連動して前記糸カセットから前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内へ前記糸を掛けるように構成したものである。
【０００６】
この糸案内への糸掛け装置は、糸掛けフックに糸カセットから導出された糸を掛けない待機位置から糸掛け可能な作用位置へ、フック部材を切換えることにより、糸掛けフックに糸を引っ掛けて糸案内へ糸を掛けるように構成されている。ここで、このようにフック部材を切換える為の操作力は、糸カセットをカセット装着部に装着する際に、この糸カセットの装着動作に連動して操作力付加部材に作用し、この操作力が操作力付加部材からフック部材へ伝達されてフック部材が待機位置と作用位置とに亙って切換えられる。このように糸掛け装置を構成することで、糸カセットの装着動作に連動して自動的に糸案内へ糸が掛かることになる。
【０００７】
請求項２の糸案内への糸掛け装置は、請求項１の発明において、前記第１糸案内へ前記糸を掛ける際に、前記第１糸案内から所定距離離れた第２糸案内にも前記糸を掛けるように構成したものである。第１糸案内へ糸が掛けられる際に、同時に第２糸案内へも糸が掛けられる。
【０００８】
請求項３の糸案内への糸掛け装置は、請求項１又は２の発明において、前記第１糸案内は、ミシン頭部の下方に位置し、前記ミシン頭部の下部に固定されたベース部材と、このベース部材にスライド可能に付設された可動部材と、この可動部材に枢着され且つ前記フック部材と連動連結され、前記操作力が入力される操作力入力部を有する回動アームと、前記操作力付加部材に作用した操作力を前記回動アームの操作力入力部に伝達する操作力伝達機構とを備えたものである。
【０００９】
糸カセットの装着動作に連動して操作力付加部材にフック部材を切換える操作力が作用すると、この操作力は、操作力伝達機構により回動アームの操作力入力部に伝達される。回動アームは、可動部材に枢着され且つフック部材と連動連結されているため、操作力入力部に操作力が入力されると、回動アームが所定角度回動するとともに、その回動に連動してフック部材が待機位置から作用位置へと切換えられる。
【００１０】
このようにフック部材が作用位置へ切換えられて、糸掛けフックに糸が掛けられた状態で、回動アームとフック部材が可動部材とともにベース部材に対してスライド移動するため、糸掛けフックに掛けられた糸が糸案内側へ引き寄せられて、糸案内に糸が掛けられる。
【００１１】
請求項４の糸案内への糸掛け装置は、請求項３の発明において、前記操作力伝達機構は、前記操作力付加部材に途中部が回動可能に枢着されたリンク部材と、このリンク部材の先端部に下方へ屈曲状に形成された先端アーム部と、前記リンク部材の基端部に設けられた従動ピンと、この従動ピンが係合する円弧状のカム溝を有するカム板とを備えたものである。
【００１２】
糸カセットの装着動作に連動して操作力付加部材に作用した操作力は、リンク部材を介して回動アームの操作力入力部に伝達されるが、リンク部材の基端部が従動ピンを介してカム板のカム溝に案内されているため、リンク部材は水平方向にスムーズに移動し、従って、先端アーム部により回動アームの操作力入力部がほぼ水平に押圧され、先端アーム部と操作力入力部との間で滑り摩擦が生じることが極力抑えられる。
【００１３】
請求項５の糸案内への糸掛け装置は、請求項４の発明において、前記糸カセットの装着時に、前記先端アーム部の下端部を回動アームの前記操作力入力部に当接させた状態で、前記先端アーム部により前記回動アームをほぼ水平な方向に駆動して、前記フック部材を待機位置から作用位置に切換える第１揺動と、作用位置に切換えた前記フック部材と前記回動アームを前記可動部材と共にスライド移動させて前記第１糸案内へ前記糸を掛けるスライド移動と、その糸掛け後に前記フック部材を待機位置へ復帰揺動させる第２揺動とを行うように構成したものである。
【００１４】
糸カセットの装着動作により操作力付加部材にフック部材を切換える操作力が作用すると、この操作力は、リンク部材の先端アーム部から回動アームの操作力入力部に伝達されて回動アームをほぼ水平に駆動する。すると、回動アームが所定角度回動するとともに、その回動に連動してフック部材が待機位置から作用位置へと揺動させる第１揺動が行われ、糸掛けフックに糸が掛けられる。
【００１５】
引き続いて回動アームの操作力入力部に操作力が入力されると、フック部材を作用位置に切換えた状態で、回動アームとフック部材が可動部材とともにスライド移動させて、第１糸案内へ糸を掛けるスライド移動が行われる。このとき、糸掛けフックに糸が掛けられた状態で第１糸案内側へフック部材が引き付けられることになるので、第１糸案内に糸が掛けられることになる。さらに、操作力が操作力入力部に入力されると、フック部材を待機位置へ復帰揺動させる第２揺動が行われ、糸掛けフックから糸を外すことが可能となる。
【００１６】
請求項６の糸案内への糸掛け装置は、縫針を支持する針棒の下部の第１糸案内と、前記第１糸案内から所定距離離れた第２糸案内とを備えたミシンの糸案内への糸掛け装置であって、糸掛けフックを有し、この糸掛けフックに糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内及び前記第２糸案内に前記糸を掛けるように構成したものである。
【００１７】
操作力付加部材にフック部材を操作する為の操作力がこの操作力付加部材以外の他の部材などから作用すると、この操作力がフック部材に伝達されてフック部材が待機位置と作用位置とに亙って切換えられる。このときに、針棒の下部の第１糸案内だけではなく、この第１糸案内から所定距離離れた第２糸案内にも糸が掛けられる。
【００１８】
請求項７の糸案内への糸掛け装置は、請求項６の発明において、前記第１糸案内と前記第２糸案内は、前記糸を掛ける為の糸掛け部であって、略同方向へ開口する糸掛け部を夫々有し、前記フック部材の作用位置は待機位置よりも前記糸掛け部の開口方向に位置し、前記第１糸案内と前記第２糸案内との間で、前記フック部材が待機位置と作用位置との間を移動するものである。
【００１９】
糸掛けフックに糸を掛ける作用位置は、待機位置よりも第１、第２糸案内の糸掛け部の開口方向に位置するため、フック部材が待機位置にあるときには、たとえ、糸がたるむことにより糸掛け部の開口付近に糸が位置したとしても、糸掛けフックとその糸が離れることになる。そして、フック部材が作用位置に切換えられたときには、糸が糸掛けフックに掛かることになる。さらに、第１糸案内と第２糸案内との間でフック部材が待機位置と作用位置との間を移動して、糸が糸掛けフックに掛かった状態でフック部材を糸掛け部の開口方向と反対側に移動させることで、糸が糸掛け部の奥端部に入り込むため、糸が第１、第２糸案内へ掛かる。
【００２０】
請求項８のミシンは、糸供給源を収容し且つミシンのカセット装着部に着脱可能に装着される糸カセットと、縫針を支持する針棒の下部の第１糸案内とを備えたミシンにおいて、前記第１糸案内へ糸を掛ける糸掛け装置を有し、前記糸掛け装置は、糸掛けフックを有し、この糸掛けフックに前記糸カセットから導出された糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、前記糸カセットの装着動作に連動して前記糸カセットから前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内へ前記糸を掛けるように前記糸掛け装置を構成したものである。このミシンは、請求項１と同じ構成の糸掛け装置を備えたものであるので、その作用は請求項１と略同様であり、説明を省略する。
【００２１】
請求項９のミシンは、縫針を支持する針棒の下部の第１糸案内と、前記第１糸案内から所定距離離れた第２糸案内とを備えたミシンにおいて、前記第１糸案内と前記第２糸案内へ糸を掛ける為の糸掛け装置を有し、前記糸掛け装置は、糸掛けフックを有し、この糸掛けフックに糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内及び前記第２糸案内に前記糸を掛けるように糸掛け装置を構成したものである。このミシンは、請求項６と同じ構成の糸掛け装置を備えたものであるので、その作用は請求項６と略同様であり、説明を省略する。
【００２２】
【発明の実施の形態】以下、本発明の実施の形態について図面を参照しながら説明する。本実施の形態は、糸カセットの装着動作に連動して自動的に縫針の目孔に糸通しを行うように構成された家庭用ミシンに、本発明を適用した場合の一例である。
【００２３】
図１、図２に示すように、家庭用のミシンＭは、水平なベッド面を有するベッド部１と、ベッド部１の右端部分に立設された脚柱部２と、脚柱部２の上部からベッド部１と対向するように左方へ延びるアーム部３と、アーム部３の左端部分に設けられた頭部４とを有する。頭部４には、糸カセット１０が着脱自在に装着されるカセット装着部５が設けられ、カセット装着部５に装着された糸カセット１０から上糸１１が導出される。アーム部３の頭部４には、縫製開始スイッチ、縫製終了スイッチ、等々の操作スイッチ類（図示略）が設けられている。また、アーム部３には、画面を正面に向けた液晶ディスプレイ７が設けられている。
【００２４】
図２、図３に示すように、頭部４には、針棒１２、天秤１３（図１０参照）、糸カセット１０から導出される上糸１１の糸調子を調節する糸調子機構１４、糸カセット１０をカセット装着部５に装着する際に上糸１１を針棒１２に支持された縫針１５の目孔１５ａに自動的に糸通しする糸通し機構１６、糸通し機構１６により糸通しする為に縫針１５の目孔１５ａ付近に上糸１１を保持する糸保持機構１７の主要部分、糸カセット１０をカセット装着部５に装着する際に上糸１１を針棒１２の下端に設けられた第１糸案内１９と頭部４の下端付近に設けられた第２糸案内２０に自動的に糸掛けする糸掛け機構１８等が設けられている。
【００２５】
２つの糸案内１９，２０は頭部４の下部において所定距離離れた位置に夫々設けられ、これら２つの糸案内１９，２０は夫々上糸１１を掛ける為の糸掛け部１９ａ，２０ａ（図２４〜図２７参照）を有し、これら糸掛け部１９ａ，２０ａは共に略同方向（右方）へ開口するように且つ略水平に形成されている。さらに、図示しないが、針棒１２を上下動させる針棒上下動機構、針棒１２を揺動させる針棒揺動機構、天秤１３を上下に揺動駆動する天秤駆動機構も頭部４に設けられている。
【００２６】
図１、図２に示すように、カセット装着部５に装着された糸カセット１０から導出される上糸１１は、糸調子機構１４の１対の糸調子皿の間の糸調子軸（図示略）に上側から掛けられ、その糸調子軸から下流側へ延びる上糸１１が天秤１３に掛けられる。さらに、天秤１３から下流側へ延びる上糸１１は、糸保持機構１７により縫針１５の目孔１５ａ付近に保持された後、糸通し機構１６により目孔１５ａに通されて、糸掛け機構１８により２つの糸案内１９，２０に上糸１１が掛けられて、上糸１１が縫製可能にセットされる。ここで、後述するように、糸通し機構１６、糸保持機構１７、糸掛け機構１８の夫々の動作は、糸カセット１０の装着動作に連動して自動的に行われる。
【００２７】
一方、ベッド部１にはボビン装着部（図示略）が設けられ、このボビン装着部に装着されたボビン（図示略）から延びる糸が下糸として使用される。また、ベッド部１には、釜機構（図示略）が設けられている。上糸１１と下糸を縫製可能にセットした状態で、ミシンモータ（図示略）が駆動されると、針棒上下動機構により針棒１２が上下動され、これに同期して釜機構が駆動されて、その釜機構によりベッド部１の針板１ａよりも下側に下降した縫針１５付近の上糸１１が引っ掛けられ、その上糸１１と下糸とが交絡して縫目が形成される。
【００２８】
ここで、糸カセット１０について説明する。図４〜図７に示すように、糸カセット１０は、カセット本体３０と、このカセット本体３０に枢着された開閉部材３１とを有し、これらの内部に糸供給源である糸駒３２を収容する糸収容部３３が形成されている。開閉部材３１には糸立棒３４が取り付けられ、開閉部材３１を前側へ開くと（図５参照）、糸立棒３４への糸駒３２の着脱が可能になり、糸駒３２が糸立棒３４に装着された状態で、開閉部材３１を閉めるとその糸駒３２が糸収容部３３に収容される。
【００２９】
カセット装着部５への装着準備が完了した糸カセット１０の状態では以下のように上糸１１がセットされている。即ち、糸駒３２からは上糸１１が上側へ延びて糸収容部３３外に導出され、そこから、カセット本体３０と開閉部材３１の左端間の糸経路３５を通って、糸カセット１０の左下端部の糸掛け部３６ａに掛けられている。ここから、上糸１１は右方へ延びて仕切壁３７の下端部の糸掛け部３６ｂと糸カセット１０の右下端部の糸掛け部３６ｃに掛けられ、さらに前方へ延びてから糸掛け部３６ｄに掛けられてＵターンし、左方へ延びて糸保持部３８に保持され、さらに、糸保持部３８の左側の刃３９で切断され、糸掛け部３６ｅに掛けられている。
【００３０】
ところで、この糸カセット１０の右側部分には、後方と下方を開口した天秤ガイドスペース４０がほぼ上下全長に亙って形成され、糸カセット１０の下端部分の中央部分に下方を開口した糸調子スペース４１が形成され、これらのスペース４０，４１が仕切壁３７により仕切られている。糸カセット１０の右側部分の前面部には、糸保持機構１７の保持部材７０が、その糸カセット１０の右側部分の前面部と干渉するのを防ぐ為の左右１対の逃し溝４３ａ，４３ｂが形成されている。
【００３１】
カセット装着部５に糸カセット１０を下降させて挿入していくと、天秤ガイドスペース４０に天秤１３が下側から入り込み、糸調子スペース４１に糸調子機構１４が下側から入り込む。糸カセット１０をカセット装着部５に少し挿入したところで、先ず、天秤ガイドスペース４０に入り込んだ天秤１３に、上糸１１の糸掛け部３６ｂ，３６ｃの間の糸部分１１ａが引っ掛けられる。
【００３２】
この状態からさらに糸カセット１０をカセット装着部５に挿入していくと、糸掛け部３６ａ，３６ｂの間の糸部分１１ｂが、糸調子スペース４１に入り込んだ糸調子機構１４により保持される。一方、糸掛け部３６ｄと糸保持部３８との間の糸部分１１ｃは、糸保持機構１７により縫針１５の目孔１５ａ付近まで引っ張られて保持される（図２２参照）。尚、糸掛け部３６ｄと糸保持部３８との間には、糸保持機構１７の糸挟持部材７４を揺動駆動する後述のカム部材４２も設けられている。
【００３３】
次に、糸通し機構１６について説明する。図８に示すように、糸通し機構１６は、針棒１２の左側において上下動可能に配設された糸通し軸５０及びスライダガイド軸５１と、これら糸通し軸５０とスライダガイド軸５１の上端部に上下動可能に外嵌された糸通しスライダ５２と、糸通し軸５０の下端部に連結され糸通し軸５０の回動動作に連動して縫針１５の目孔１５ａに上糸１１を通すフック機構５３と、糸カセット１０の装着動作に連動して糸通し軸５０を下方へ駆動する糸通し軸駆動部材５４等を有する。
【００３４】
糸通し軸５０及びスライダガイド軸５１は、針棒１２と共に針棒台５５に支持されており、これら針棒１２、針棒台５５、糸通し軸５０及びスライダガイド軸５１は、針棒揺動機構により一体的に揺動可能に配設されている。ここで、後述の糸保持機構１７により保持された上糸１１をフック機構５３により目孔１５ａに通すことができるような所定の位置に針棒１２（縫針１５）をセットしておく必要があるため、糸通し機構１６による糸通し動作の直前の状態（糸カセット１０の装着直前の状態）では、針棒１２は最も左側に揺動した位置にある。さらに、上下方向位置についても、針棒１２は、目孔１５ａに上糸１１を通すことができる位置、具体的には最上位置よりもやや下側の所定の位置にある。
【００３５】
糸通し軸５０の上端側部分と上下方向途中部には夫々ピン部材５６ａ，５６ｂが突設され、糸通し軸５０が所定量下降したときには、ピン部材５６ｂは針棒１２の上下方向途中部に固定された規制部材１２ｃに係合する。さらに、糸通し軸５０には糸通しスライダ５２を上方へ付勢するコイルバネ５７が外装されている。スライダガイド軸５１の上半部には、糸通しスライダ５２を上方へ付勢するコイルバネ５８が外装されている。糸通しスライダ５２には、上半部の直線溝と下半部の螺旋溝とからなるカム溝５２ａが形成されている。さらに、糸通しスライダ５２には、上方へ突出する突出板５９も設けられている。この突出板５９の後面側には、水平面（図示略）が形成されている。
【００３６】
図８、図９に示すように、フック機構５３は、上糸１１を引っ掛ける糸通しフック６０と、糸通しフック６０の両側に位置する２枚のガイド部材６１，６２と、これら糸通しフック６０とガイド部材６１，６２を水平に貫通する糸保持ワイヤ６３と、糸通し軸５０の下端部に固定され糸通しフック６０とガイド部材６１，６２等を保持するフック保持部材６４を備えている。図９に示すように、糸通しフック６０の先端部にはフック部６０ａが形成され、糸通しの際には、縫針１５の目孔１５ａにこのフック部６０ａが挿通され、糸通しフック６０は２枚のガイド部材６１，６２に両側から案内された状態で、後述の糸保持機構１７により目孔１５ａ付近に保持された上糸１１を引っ掛けるように構成されている。
【００３７】
糸通し軸駆動部材５４は、ガイド軸６５に上下摺動可能に外嵌されたスライド部材６６に回動可能に連結され、ねじりバネ６７により図８（ａ）の時計回りの方向に付勢されている。一方、スライド部材６６は、コイルバネ６８により上方へ付勢されている。糸通し軸駆動部材５４の上端部には、突出板５９の水平面に当接して糸カセット１０の装着時の駆動力を糸通しスライダ５２に伝達する駆動力伝達部５４ａが形成され、糸通し軸駆動部材５４の下端部には糸通しスライダ５２に駆動力が伝達されるのを遮断する為のカム部５４ｂが形成されている。一方、ガイド軸６５の下端部には、傾斜状の先端カム部６９ａを有するカム部材６９が固定されており、糸通し軸駆動部材５４が所定量下方へ移動したときには、先端カム部６９ａにカム部５４ｂが当接することになる。
【００３８】
この糸通し機構１６による糸通し動作について説明する。糸カセット１０の装着動作に連動して糸通し軸駆動部材５４がコイルバネ６８の付勢力に抗して下方へ駆動されると、駆動力伝達部５４ａが突出板５９の水平面に接触して、その駆動力が糸通しスライダ５２の突出板５９に伝達されるため、糸通し軸５０及びスライダガイド軸５１も下方へ移動することになる。糸通し軸５０が所定量下方へ移動すると、ピン部材５６ｂが規制部材１２ｃと係合してそれ以上糸通し軸５０は下方へ移動しなくなるが、糸通しスライダ５２はコイルバネ５８の付勢力に抗してさらに下方へ移動する。このとき、糸通し軸５０に設けられたピン部材５６ａが、糸通しスライダ５２のカム溝５２ａに沿って相対的に移動することになるため、この糸通しスライダ５２の糸通し軸５０に対する下方への相対移動が糸通し軸５０の回動動作に変換されて、糸通し軸５０が所定角度回動する。このとき、図９（ａ）に示すように、糸通し軸５０の下端部に設けられたフック機構５３も糸通し軸５０と一体的に縫針１５側へ回動し、糸通しフック６０のフック部６０ａが縫針１５の目孔１５ａを通過して上糸１１を引っ掛ける。
【００３９】
図９（ａ）に示すように、フック部６０ａが上糸１１を引っ掛けた状態では、糸通し軸駆動部材５４は所定の位置まで下方へ移動して、そのカム部５４ｂがカム部材６９の先端カム部６９ａに当接する。この状態からさらに糸カセット１０がカセット装着部５内に押し込まれて糸通し軸駆動部材５４が下方へ移動すると、先端カム部６９ａにより、糸通し軸駆動部材５４はねじりバネ６７の付勢力に抗して図８（ａ）の反時計回りの方向に回動駆動される。
【００４０】
すると、駆動力伝達部５４ａが突出板５９の水平面から離隔することになるため、糸通しスライダ５２に糸通し軸５０を下方へ駆動する駆動力が伝達されなくなる。従って、糸通し軸５０が逆方向に回動するとともにコイルバネ５８の付勢力により上方へ復帰し、それに伴って、フック機構５３も縫針１５から離れる方向へ回動するため、図９（ｂ）に示すように、上糸１１を引っ掛けた糸通しフック６０が目孔１５ａから抜け、糸通し動作が完了する。
【００４１】
次に、糸保持機構１７について説明する。図３、図６、図１０〜図１２に示すように、糸保持機構１７は、所定間隔をあけて上糸１１を保持可能な１対の糸保持部７１，７２を含む保持部材７０と、糸カセット１０の装着動作に連動して１対の糸保持部７１，７２を縫針１５の目孔１５ａ付近に移動させる連動移動機構７３と、左側の糸保持部７１に上糸１１を解除可能に挟持する糸挟持部材７４と、この糸挟持部材７４を糸挟持側へ弾性付勢するねじりバネ７５（付勢部材）と、糸カセット１０のカセット本体３０に付設され、糸カセット１０の装着工程の所定タイミングにおいて糸挟持部材７４を一時的に挟持解除側へ揺動駆動するカム部材４２とを備えている。
【００４２】
さらに、糸保持機構１７は、頭部４に固定された本体フレーム７６と、この本体フレーム７６に昇降可能に案内支持され且つ保持部材７０が固定された可動フレーム７７であって、連動移動機構７３により連動移動される可動フレーム７７とを有する。本体フレーム７６は、天秤１３の上下揺動経路の左右両側に位置するガイド部材７８と、ガイド部材７８の右側に設けられ可動フレーム７７の昇降移動を案内する左右１対の案内板７９ａ，７９ｂ（図３参照）とを有する。可動フレーム７７は左右１対の案内板７９ａ，７９ｂの間に配設された左右１対の可動板８０ａ，８０ｂを複数の連結ピンで連結して構成されている。
【００４３】
先ず、保持部材７０及び糸挟持部材７４について説明する。図１１に示すように、保持部材７０の１対の糸保持部７１，７２は連結部材８１で連結されている。連結部材８１の右端部は右方へ水平に延び、連結部材８１は、後述の保持部材支持体１０４を介して連動移動機構７３の第２ワイヤ１０１に固定されている。糸保持部７１，７２には、糸カセット１０の装着時に上糸１１を引っ掛ける為の凹部７１ａ，７２ａが夫々形成されている。左側の糸保持部７１には糸挟持部材７４が枢支軸８２にて枢着され、枢支軸８２にはねじりバネ７５が装着されている。
【００４４】
糸挟持部材７４の下端部の前側部分には、左側の糸保持部７１と協働して上糸１１を挟持する凹部７４ａが形成されている。糸挟持部材７４の下端側部分には、後述するカム部材４２に操作される従動ピン８４が設けられ、一方、図１１　（ｂ）に示すように、糸挟持部材７４の上端部（枢支軸８２に対して従動ピン８４と反対側）は、糸挟持部材７４が所定範囲以上糸挟持側へ揺動するのを規制する規制ピン８５が設けられている。ここで、従動ピン８４は左方へ、規制ピン８５は従動ピン８４とは逆に右方へ、夫々突出するように構成されている。
【００４５】
次に、連動移動機構７３について説明する。図１１、図１２に示すように、連動移動機構７３は、糸カセット１０の装着時に糸カセット１０に接触して糸カセット１０と一体的に下降する合成樹脂製のカセット接触体９０と、カセット接触体９０の移動量の４倍の量だけ保持部材７０を移動させる第１、第２動滑車機構９１，９２等を備えている。カセット接触体９０は、本体フレーム７６の左右１対の案内板７９ａ，７９ｂの間で上下動可能に配設され、カセット接触体９０の左端側部分には、糸カセット１０の下端部が接触する接触部９０ａが左側の案内板７９ａから左方へ突出するように形成されている。
【００４６】
第１動滑車機構９１は、カセット接触体９０と共に一体的に上下動するように連結された滑車９３と、この滑車９３に巻かれ且つ一端が案内板７９ｂに固定された第１ワイヤ９４と、第１ワイヤ９４の他端に連結された滑車９５等を備えている。滑車９３は、合成樹脂製の滑車収容部材９６の内部に収容され、滑車収容部材９６は、カセット接触体９０の下方において１対の案内板７９ａ，７９ｂの間で、滑車９３と一体的に上下動可能に配設されている。カセット接触体９０と滑車収容部材９６との間には、カセット接触体９０を滑車９３に対して上方へ付勢するコイルバネ９７が設けられている。一方、滑車９３（及び滑車収容部材９６）は、可動フレーム７７を上方へ復帰させる為のコイルバネ９８により上方へ付勢されており、このコイルバネ９８の下端は左側の可動板８０ａの下端部に連結されている。
【００４７】
第１ワイヤ９４の一端は案内板７９ｂのカセット接触体９０よりも上側の部分に固定され、第１ワイヤ９４の他端は左右一対の可動板８０ａ，８０ｂの上端部を連結するピン部材９９に固定されている。このピン部材９９は、左右一対の案内板７９ａ，７９ｂにより案内溝１００に沿って上下動可能に支持されており、ピン部材９９に滑車９５が回転可能に支持されている。従って、ピン部材９９が案内溝１００に案内された状態で、滑車９５と可動板８０ａ，８０ｂ（可動フレーム７７）は案内板７９ａ，７９ｂ（固定フレーム７６）に対して相対的に上下移動可能である。
【００４８】
糸カセット１０の装着時に、カセット接触体９０に糸カセット１０が接触してカセット接触体９０が押し下げられると、滑車９３もカセット接触体９０と一体的に下方へ押し下げられる。このときには、滑車９３が動滑車として作用するため、カセット接触体９０の移動量の２倍の量だけ、滑車９５、つまり、可動フレーム７７が下方へ移動することになる。
【００４９】
第２動滑車機構９２は、両端が案内板７９ｂに固定された第２ワイヤ１０１と、この第２ワイヤ１０１が巻かれる２つの滑車１０２，１０３等を有する。２つの滑車１０２，１０３は、左右一対の可動板８０ａ，８０ｂの下端部及び上端部に夫々回転可能に支持されている。第２ワイヤ１０１の一端は案内板７９ｂの上端部に固定され、第２ワイヤ１０１が２つの滑車１０２，１０３に巻かれた状態で、第２ワイヤ１０１の他端は案内板７９ｂの下端部に固定されている。
【００５０】
図１２、図１３に示すように、第２ワイヤ１０１のうち２つの滑車１０２，１０３の間の部分には、合成樹脂製の保持部材支持体１０４が固定され、この保持部材支持体１０４には保持部材７０の連結部材８１が連結されている。これら保持部材支持体１０４及び連結部材８１は、左右１対の可動板８０ａ，８０ｂの間で案内溝１０５に沿って上下動可能に支持されている。
【００５１】
前述の第１動滑車機構９１により左右１対の可動板８０ａ，８０ｂが下方へ移動すると、可動板８０ａ，８０ｂの移動に伴って２つの滑車１０２，１０３も下方へ移動する。ここで、滑車１０２は動滑車として作用することになり、第２ワイヤ１０１のうち滑車１０２に巻かれている部分が滑車１０２で押し下げられると、滑車１０２の移動量の２倍の量だけ滑車１０２の前側（図１２の右側）から後側（図１２の左側）へ第２ワイヤ１０１が移動することになる。
【００５２】
つまり、第２ワイヤ１０１のうち滑車１０２，１０３の間の部分に連結されている保持部材７０も、滑車１０２（可動フレーム７７）の移動量の２倍の量だけ下方へ移動する。即ち、保持部材７０の移動量は糸カセット１０の移動量の４倍となる。
【００５３】
次に、カム部材４２について説明する。図４、図６、図７、図１０に示すように、カム部材４２は、カセット本体３０の後端部の右側部分において、カセット本体３０の前面部に前方突出状にカセット本体３０に一体的に形成されている。このカム部材４２は、カセット本体３０の前面から前方へ突出する突出部１１０と、この突出部１１０の前端から右方へ延びるカム形成部１１１とを有する。カム形成部１１１と糸カセット１０の前面との間には、糸カセット１０の装着時に従動ピン８４が糸カセット１０に対して相対的に通過するピン通路１１２が形成されている。
【００５４】
カム形成部１１１の後面部には、糸カセット１０の装着時に従動ピン８４が相対移動（摺動）するカム面１１１ａが形成され、このカム面１１１ａは、下方程後方へ張り出す上部傾斜面と、その上部傾斜面の下端に連続し、下方程前方へ張り出す下部傾斜面とで構成されている。即ち、糸カセット１０の前面に面するカム面１１１ａが後方に突出するように形成されている。尚、この上部傾斜面と下部傾斜面との連続した部分は折曲しており、その折曲した部分でカム面１１１ａは最も後方へ突出している。従って、糸カセット１０が下方へ移動していくにつれ、従動ピン８４がカム面１１１ａに沿ってピン通路１１２を通過することで、カム部材４２により従動ピン８４が操作されて、糸挟持部材７４が前後に揺動することになる。このときに、糸保持部７１と糸挟持部材７４との間で上糸１１が挟持されることになる。この糸保持部７１と糸挟持部材７４とによる上糸１１の挟持動作を中心に、糸保持機構１７の糸保持動作について主に図１０、図１４〜図２３を参照して以下述べる。
【００５５】
図１４に示すように、糸カセット１０がカセット接触体９０に接触した直後の状態では、糸挟持部材７４はねじりバネ７５により糸挟持側へ付勢された状態である。この状態から、図１５に示すように、糸カセット１０がカセット装着部５内へ押し込まれると、その糸カセット１０の装着動作に連動して保持部材７０が下方へ移動し始めるが、図１２の第１、第２動滑車機構９１，９２により、保持部材７０の移動量は糸カセット１０の移動量の４倍になるため、保持部材７０は糸カセット１０に対して相対的に下方へ移動することになる。
【００５６】
そして、図１６に示すように、従動ピン８４が、カム部材４２の内側に形成されたピン通路１１２内に到達すると、従動ピン８４がカム面１１１ａにより後方へ押圧されていき、それに伴い糸挟持部材７４が枢支軸８２を中心に挟持解除側へ揺動し始める。さらに保持部材７０が下方へ移動して、図１７に示すように、従動ピン８４がカム面１１１ａの最も後方へ突出した部分に到達したときには、糸挟持部材７４が最大限挟持解除側へ揺動した状態となり、このときに、糸カセット１０の前側に張られた上糸１１の糸部分１１ｃ（図４、図７参照）が糸保持部７１の凹部７１ａと糸挟持部材７４の凹部７４ａの間に入り込むことになる。
【００５７】
さらに、従動ピン８４がカム面１１１ａに沿って下方へ相対移動して、ピン通路１１２内でカム面１１１ａの最も突出した部分を過ぎると、糸挟持部材７４はねじりバネ７５（図１１（ｂ）参照）に付勢されて糸挟持側へ揺動し始める。そして、図１８に示すように、従動ピン８４がピン通路１１２を抜けてカム面１１１ａと接触しなくなったときには、糸保持部７１の凹部７１ａと糸挟持部材７４の凹部７４ａとの間で上糸１１が挟持されることになる。尚、規制ピン８５は、糸保持部７１の凹部７１ａ及び糸挟持部材７４の凹部７４ａに対して上方向に離間している。
【００５８】
このようにして上糸１１が挟持された状態で、図１９に示すように、さらに可動フレーム７７は下方へ移動していき、上糸１１は縫針１５の目孔１５ａの付近に、糸保持部７１，７２により保持された状態となる。このときに、図２０に示すように、前述の糸通し機構１６のフック機構５３が図２０の時計回りの方向に回転して糸通しフック６０が目孔１５ａを通過する。
【００５９】
ここで、保持部材７０が縫針１５の目孔１５ａの付近まで移動したときに、糸カセット１０の下端部と接触して押し下げられていたカセット接触体９０が糸カセット１０から離れ、復帰用のコイルバネ９８の付勢力により滑車９３が上方へ移動し、それに伴って可動フレーム７７及び保持部材７０が上方へ移動し始める。このときに、糸通しフック６０に保持部材７０の１対の糸保持部７１，７２に保持された上糸１１が引っ掛けられ、糸通しフック６０が上糸１１を引っ掛けた状態で前述のようにフック機構５３が図２０の反時計回りの方向に復帰することで、図２１、図２２に示すように、目孔１５ａに上糸１１が通される。
【００６０】
目孔１５ａに上糸１１が通された後には、保持部材７０は可動フレーム７７と共に上方へ移動するが、前述の保持部材７０が下方へ移動する場合（図１８参照）とは、図２３に示すように、連結部材８１が案内溝１０５と係合する位置が異なるため、従動ピン８４とカム部材４２のカム面１１１ａとが離れており、それらが干渉することなく、保持部材７０はスムーズに上方へ復帰移動することになる。尚、規制ピン８５は、糸挟持部材７４よりも右側にあり、カム部材４２から右方向に離間しているため、規制ピン８５が保持部材７０の上下動の妨げとはならない。
【００６１】
次に、糸掛け機構１８について説明する。図３、図２４〜図３１に示すように、糸掛け機構１８は、頭部４の下部に固定された水平板状のベース部材１２０と、このベース部材１２０の下側にスライド可能に付設された可動部材１２１と、この可動部材１２１の下側に枢着された回動アーム１２２と、可動部材１２１の下側に枢着され先端に糸掛けフック１２３ａを有するフック部材１２３であって、この糸掛けフック１２３ａに糸カセット１０から導出された上糸１１を掛けない待機位置（図２４、図２８参照）と糸掛け可能な作用位置（図２５、図２９参照）とに揺動可能で回動アーム１２２に連動連結されたフック部材１２３と、フック部材１２３を待機位置と作用位置とに亙って切換える為の操作力をフック部材１２３に付加する為の操作力付加部材１２４（図２８、図２９参照）と、操作力付加部材１２４に作用した操作力を回動アーム１２２に伝達する操作力伝達機構１２５（図２８、図２９参照）とを備えている。
【００６２】
この糸掛け機構１８は、糸カセット１０の装着動作に連動して糸カセット１０から操作力付加部材１２４に作用する操作力により、フック部材１２３を待機位置から作用位置に切換える第１揺動と、作用位置に切換えたフック部材１２３と回動アーム１２２を可動部材１２１と共にスライド移動させて２つの第１、第２糸案内１９，２０へ糸を掛けるスライド移動と、第１、第２糸案内１９，２０への糸掛け後にフック部材１２３を待機位置へ復帰揺動させる第２揺動とを行うように構成されている。
【００６３】
ここで、待機位置には、糸カセット１０の装着前の状態において糸案内１９，２０に近い第１の待機位置（図２４、図２８参照）と、糸カセット１０の装着状態において第１の待機位置よりも糸案内１９，２０から離れた第２の待機位置　（図２７、図３１参照）の２つの待機位置が含まれる。
【００６４】
ベース部材１２０は、糸調子機構１４の一部を構成するフレーム部材１３０に、２つの支持部材１３１，１３２（図２８参照）により下方に吊り下げられた状態で取付けられている。ベース部材１２０の左右方向途中部には、スライド移動の際に左方へ移動する回動アーム１２２を受け止めて停止させるストッパ部材１３３が下方突出状に一体的に形成されている。
【００６５】
可動部材１２１は平面視略矩形状且つ水平板状の部材で構成され、２本のピン部材１３４，１３５によりベース部材１２０に左右方向にスライド可能に取付けられている。可動部材１２１には、２本のピン部材１３４，１３５が係合してベース部材１２０に対するスライド移動をガイドするガイド溝１２１ａが左右方向に延びるように形成されている。
【００６６】
つまり、可動部材１２１は、左側のピン部材１３４がガイド溝１２１ａの左端の位置にある状態（図２４参照）から、右側のピン部材１３５がガイド溝１２１ａの右端に到達するまで（図２７参照）の所定距離だけスライド移動自在にベース部材１２０に付設されている。ガイド溝１２１ａの後側にはガイド溝１２１ａと平行なスリット１２１ｂが形成され、このスリット１２１ｂには、可動部材１２１を右方（図２４の糸掛け開始端位置）へ弾性付勢する可動部材１２１の復帰用のコイルバネ１３６が装着されている。
【００６７】
回動アーム１２２の基端部は、可動部材１２１の右端部の前側部分にピン１３７（図２８参照）を介して枢着され、このピン１３７には、回動アーム１２２を図２４の反時計回りの方向（フック部材１２３が待機位置となる方向）へ弾性付勢するねじりバネ１３８（図２８参照）が装着されている。回動アーム１２２の前後方向中央部の右側部分には、操作力伝達機構１２５によりフック部材１２３を切換える為の操作力が入力される操作力入力部１２２ａが形成されている。回動アーム１２２の先端部の左側部分には、後述するように回動アーム１２２が可動部材１２１と一体的に左方へ所定距離スライド移動したときにストッパ部材１３３に当接する当接部１２２ｂが水平突出状に形成されている。
【００６８】
フック部材１２３の基端部は可動部材１２１にピン１３９を介して枢着され、回動アーム１２２の先端部とフック部材１２３の基端部付近部は、以下に述べる連動機構１４０により連動連結されている。従って、フック部材１２３の基端部と回動アーム１２２の基端部とは共に可動部材１２１に枢着され、そのフック部材１２３の基端部と回動アーム１２２の基端部の位置関係が一定に保たれている。その連動機構１４０は、回動アーム１２２の先端部に形成された切欠き部１２２ｃと、フック部材１２３の基端部付近部のピン１３９よりも後側の部分に下方に突出するように設けられ切欠き部１２２ｃに係合するピン１４１とを備えている。
【００６９】
フック部材１２３が図２４、図２８に示す第１の待機位置にある状態では、フック部材１２３の糸掛けフック１２３ａは上糸１１から離れているが、この状態から、図２５、図２９に示すように、ねじりバネ１３８の付勢力に抗して図２５の時計回りの方向に回動アーム１２２がピン１３７を中心として所定角度θ１　（例えば、θ１　≒２０°）だけ回動すると、この回動に伴って切欠き部１２２ｃも角度θ１　だけ回動する。このとき、切欠き部１２２ｃによってピン１４１はピン１３９を中心に回転する。
【００７０】
ここで、回動アーム１２２の回動中心であるピン１３７とピン１４１との距離は、ピン１３９，１４１間の距離よりも大きいため、ピン１４１の回動によりフック部材１２３が水平な状態で揺動したときに、ピン１４１の回動が拡大されて糸掛けフック１２３ａはピン１３９を中心に図２５の時計回りの方向に回動アーム１２２の回動角度よりも大きい所定角度θ２　（例えば、θ２　≒９０°）水平状態で揺動し、フック部材１２３は図２５、図２９に示す作用位置に到達して糸掛けフック１２３ａが上糸１１に係合する。但し、フック部材１２３は回動アーム１２２及び可動部材１２１の下方にあり、このフック部材１２３には上方に突出する突出部（図示略）が一体的に形成され、フック部材１２３の回動によってその突出部も一体的に回動する。そして、この突出部の回動経路上には可動部材１２１が部分的に張り出しており、フック部材１２３が所定角度θ２　だけ回動すると、フック部材１２３の突出部と可動部材１２１の張り出した部分（図示略）とが係合して、フック部材１２３がそれ以上回動できない。
【００７１】
図２８〜図３１に示すように、操作力付加部材１２４は、糸調子機構１４のフレーム部材１３０に揺動可能に枢着されている。操作力付加部材１２４の先端側（右端側）部分には、糸カセット１０の下端部が接触するカセット接触部１２４ａが前方に突出するように設けられている。糸カセット１０の装着時には、糸カセット１０の装着動作に連動して糸カセット１０からカセット接触部１２４ａに、フック部材１２３を待機位置と作用位置とに亙って切換える為の操作力が伝達されて、操作力付加部材１２４は図２８の時計回りの方向に揺動する。
【００７２】
操作力伝達機構１２５は、操作力付加部材１２４の下端部に左右方向途中部が回動可能に枢着されたリンク部材１４５と、リンク部材１４５の先端部（右端部）に下方へ屈曲状に形成された先端アーム部１４５ａと、リンク部材１４５の基端部（左端部）に設けられた従動ピン１４６と、この従動ピン１４６が係合する円弧状のカム溝１４７ａを有するカム板１４７とを備えている。
【００７３】
リンク部材１４５は左右方向に延び且つ左右方向に移動可能に配設されており、カセット接触部１２４ａに糸カセット１０から操作力が作用して、操作力付加部材１２４が図２８の時計回りの方向に揺動すると、その揺動に伴ってリンク部材１４５は左方へ移動する。ここで、前述のように、可動部材１２１はコイルバネ１３６により右方へ付勢され、この可動部材１２１に回動アーム１２２が枢着されているため、先端アーム部１４０ａの下端部は回動アーム１２２の操作力入力部１２２ａに常に当接した状態である。
【００７４】
つまり、左右方向に延びるリンク部材１４５を介して操作力を回動アーム１２２の操作力入力部１２２ａに伝達するが、リンク部材１４５の基端部が従動ピン１４６を介してカム板１４７のカム溝１４７ａに案内されているため、操作力付加部材１２４の下端部が円弧状に移動すると、この円弧とほぼ一致したカム溝１４７ａの円弧に沿って従動ピン１４６が移動し、リンク部材１４５の全体が左右方向にスムーズに移動することができる。即ち、リンク部材１４５は、そのリンク部材１４５の一部に回転中心を有して回転するものではない。従って、先端アーム部１４５ａは回動アーム１２２の操作力入力部１２２ａをほぼ水平に左方へ押圧することになり、先端アーム部１４５ａと操作力入力部１２２ａとの間で滑り摩擦が生じるのを極力抑えることができる。
【００７５】
次に、この糸掛け機構１８による糸掛け動作について説明する。糸カセット１０の装着前の状態では、図２４、図２８に示すように、フック部材１２３は糸掛けフック１２３ａに上糸１１を掛けない第１の待機位置にある。この状態から、糸カセット１０をカセット装着部５内に押し込んでいくと、糸カセット１０のカセット本体２０の下端部がカセット接触部１２４ａに当接し、糸カセット１０からカセット接触部１２４ａに操作力が作用して、カセット接触部１２４ａが図２８の時計回りの方向へ揺動する。
【００７６】
このとき、操作力伝達機構１２５により、操作力付加部材１２４からリンク部材１４５の先端アーム部１４５ａを介して回動アーム１２２の操作力入力部１２２ａに操作力が伝達されると、回動アーム１２２を所定角度θ１　だけ回動させるとともにフック部材１２３を待機位置から作用位置へ切換える第１揺動が行われる。
【００７７】
即ち、先端アーム部１４５ａから操作力入力部１２２ａに入力された操作力により、回動アーム１２２がピン１３７を回転中心として図２４の時計回りの方向へ所定角度θ１　だけ回動駆動され、回動アーム１２２に連動連結されたフック部材１２３も、連動機構１４０により、第１糸案内１９と第２糸案内２０との間で、ピン１３９を回転中心として図２４の時計回りの方向へ揺動されて、図２５に示すように、糸掛けフック１２３ａが所定角度θ２　だけ回動して作用位置に切換えられ、糸掛けフック１２３ａが上糸１１に係合する。ここで、糸掛けフック１２３ａに確実に上糸１１が掛かるように、図２５に示すフック部材１２３の作用位置は、図２４に示す第１の待機位置よりも右方（糸掛け部１９ａ，２０ａの開口方向）に位置するように構成されている。尚、この回動アーム１２２の回動に伴い、回動アーム１２２の先端部に形成された当接部１２２ｂは左方へ突出した状態となる。
【００７８】
第１揺動後にさらに回動アーム１２２に操作力が伝達されると、回動アーム１２２は可動部材１２１の張り出した部分とフック部材１２３の突出部との間の係合により所定角度θ１　以上に回動しないように規制されるため、図２６、図３０に示すように、作用位置に切換えられたフック部材１２３と回動アーム１２２とが可動部材１２１と共にコイルバネ１３６の付勢力に抗して、当接部１２２ｂがストッパ部材１３３に当接するまで左方へ所定距離スライド移動することになる。このスライド移動の際には、糸掛けフック１２３ａに係合した上糸１１がフック部材１２３と共に左方へ引き寄せられ、第１糸案内１９と第２糸案内２０の糸掛け部１９ａ，２０ａに夫々上糸１１が掛けられる。
【００７９】
ここで、図２４〜図２７に示すように、２つの糸案内１９，２０の糸掛け部１９ａ，２０ａは夫々略右方へ開口し、これら２つの糸案内１９，２０の間でフック部材１２３は待機位置と作用位置との間を移動することになる。従って、このスライド移動により、糸掛けフック１２３ａに係合した上糸１１が、２つの糸案内１９，２０に確実に掛けられることになる。さらにこのとき、糸掛けフック１２３ａに係合した上糸１１は、糸案内１９，２０の糸掛け部１９ａ，２０ａの開口端（右端）から奥端（左端）側へ移動させられて、上糸１１は糸案内１９，２０の奥端部に確実に掛けられることになる。
【００８０】
図２６、図３０に示すように、当接部１２２ｂがストッパ部材１３３に当接して、ピン１４１が左方向に移動不可となった状態（可動部材１２１に対して回動アーム１２２の一部が一時的に停止した状態）で、さらに糸カセット１０が押し込まれて操作力入力部１２２ａに操作力が入力されると、フック部材１２３を第２の待機位置へ復帰揺動させる第２揺動が行われる。即ち、右側のピン部材１３５がガイド溝１２１ａの右端に係合するまで可動部材１２１はベース部材１２０に対して左方へ移動することになるので、図２７、図３１に示すように、回動アーム１２２がピン１４１を回転中心として図２７の反時計回りの方向に回動し、連動機構１４０によりフック部材１２３もピン１４１を回転中心として図２７の反時計回りの方向に揺動されて、フック部材１２３が第２の待機位置へ切換えられる。
【００８１】
その回動アーム１２２の回転に伴って当接部１２２ｂがストッパ部材１３３に対して摺動する。このときに、糸掛けフック１２３ａに対する上糸１１の係合が解除されて上糸１１が糸掛けフック１２３ａから外れ、糸案内１９，２０への糸掛け動作が完了する。尚、フック部材１２３が第２の待機位置に切換えられていると、フック部材１２３が第１の待機位置に切換えられている場合よりも、糸掛けフック１２３ａは針棒１２や上糸１１から離れている。
【００８２】
次に、糸カセット１０の装着時におけるミシンＭの一連の作用について、前述の糸通し機構１６による糸通し動作、糸保持機構１７による糸保持動作、糸掛け機構１８による糸掛け動作を中心に説明する。糸カセット１０をカセット装着部５の上部に上方から挿入して押し込むと、図１４〜図１９に示すように、糸保持機構１７において、カセット本体３０の下端部がカセット接触体９０を下方へ押し下げるため、連動移動機構７３により保持部材７０が糸カセット１０の装着動作に連動して下方へ移動する。その際に、図１６に示すように、糸挟持部材７４に設けられた従動ピン８４が糸カセット１０のカム部材４２の内側のピン通路１１２に到達すると、従動ピン８４はカム面１１１ａに沿って下方へ移動することになるため、従動ピン８４がカム部材４２に操作されて糸挟持部材７４が枢支軸８２を中心にねじりバネ７５の付勢力に抗して挟持解除側へ揺動し始める。
【００８３】
さらに保持部材７０が下方へ移動して、図１７に示すように、従動ピン８４がカム面１１１ａの最も後方へ突出した部分に当接したときには、糸挟持部材７４が最大限挟持解除側へ揺動した状態となり、このときに、糸カセット１０の前側に張られた上糸１１の糸部分１１ｃ（図４、図７参照）が左側の糸保持部７１と糸挟持部材７４の間に入り込むことになる。
【００８４】
その後、従動ピン８４がカム面１１１ａに沿って下方へ相対移動するにつれ、ねじりバネ７５により糸挟持部材７４が糸挟持側へ揺動駆動され、従動ピン８４がピン通路１１２から抜けてカム面１１１ａから完全に離れたときには、図１８に示すように、糸保持部７１と糸挟持部材７４との間で上糸１１が挟持される。この状態で、糸カセット１０の装着動作に伴い可動フレーム７７及び保持部材７０がさらに下方へ移動し、保持部材７０の左右１対の糸保持部７１，７２により上糸１１が縫針１５の目孔１５ａ付近に保持される。
【００８５】
このとき、糸通し機構１６による糸通し動作も同時に行われる。即ち、図８に示すように、糸カセット１０の装着動作に連動して糸通し軸５０、スライダガイド軸５１及び糸通しスライダ５２が下方へ移動し、糸通し軸５０が所定距離下方へ移動すると、糸通し軸５０はピン部材５６ｂと規制部材１２ｃにより下方への移動を係止されるが、糸通しスライダ５２はコイルバネ５８の付勢力に抗してさらに下方へ移動する。つまり、糸通しスライダ５２が糸通し軸５０に対して相対的に下方へ移動し、その相対移動がピン部材５６ａと糸通しスライダ５２のカム溝５２ａにより糸通し軸５０の回転に変換されて糸通し軸５０が所定角度回動する。
【００８６】
このときに、図２０に示すように、糸通し軸５０の下端部に設けられたフック機構５３も糸通し軸５０と一体的に回動して、糸通しフック６０のフック部６０ａが縫針１５の目孔１５ａを通過する。ちょうどこのときに、糸保持機構１７の保持部材７０が最下端の位置から上昇し始め、保持部材７０の糸保持部７１，７２により保持された上糸１１がフック部６０ａに引っ掛かることになる。
【００８７】
このとき、糸通し軸駆動部材５４のカム部５４ｂがカム部材６９の先端カム部６９ａに当接して、糸通し軸駆動部材５４がねじりバネ６７の付勢力に抗して図８の反時計回りの方向に駆動される。従って、糸通しスライダ５２に糸通し軸５０を下方へ駆動する駆動力が伝達されなくなるため、糸通し軸５０が逆方向に回転するとともにコイルバネ５８の付勢力により上方へ復帰し、それに伴って、フック機構５３も糸通し軸５０と一体的に回動するため、図２１に示すように、上糸１１を引っ掛けたフック部材１２３が目孔１５ａから抜け、糸通し動作が完了する。
【００８８】
このように、糸保持機構１７により保持された上糸１１が糸通し機構１６により目孔１５ａに通された状態で、さらに、糸カセット１０がカセット装着部５に押し込まれると、糸掛け機構１８により２つの糸案内１９，２０に上糸１１が掛けられる。即ち、図２４、図２８に示すように、フック部材１２３が糸掛けフック１２３ａに上糸１１を掛けない第１の待機位置にある状態から、糸カセット１０をカセット装着部５内に押し込んでいくと、カセット本体３０の下端部が操作力付加部材１２４のカセット接触部１２４ａに当接し、糸カセット１０からカセット接触部１２４ａに操作力が作用する。
【００８９】
この操作力付加部材１２４に作用した操作力が、操作力伝達機構１２５により回動アーム１２２の操作力入力部１２２ａに伝達されると、連動機構１４０を介して、先ず、図２５、図２９に示すように、フック部材１２３を第１の待機位置から作用位置に切換える第１揺動が行われ、上糸１１が糸掛けフック１２３ａに係合する。次に、図２６、図３０に示すように、作用位置に切換えたフック部材１２３と回動アーム１２２を可動部材１２１と共にスライド移動させるスライド移動が行われ、２つの糸案内１９，２０の糸掛け部１９ａ，２０ａに上糸１１が掛けられる。さらに、図２７、図３１に示すように、糸案内１９，２０への糸掛け後にフック部材１２３を第２の待機位置へ復帰揺動させる第２揺動が行われ、糸掛けフック１２３ａから上糸１１が外れて糸掛け動作が完了する。
【００９０】
以上説明したミシンＭによれば、次のような効果が得られる。
【００９１】
１）糸掛け機構１８は、糸カセット１０の装着動作に連動して糸カセット１０から操作力付加部材１２４に作用する操作力によりフック部材１２３を待機位置と作用位置とに亙って切換えて第１糸案内１９へ上糸１１を掛けるように構成されたので、糸カセット１０の装着動作に連動して自動的に第１糸案内１９へ糸を掛けることができる。また、糸通し機構１６による目孔１５ａへの糸通し後には、針棒１２は最上位置に近い所定の位置にあるため、第１糸案内１９は、頭部４の真下で接近して位置し、糸通し動作時や布の出し入れ時には作業者自らが第１糸案内１９に糸を掛けるのは困難であるが、前述のように、糸カセット１０の装着動作に連動してこの第１糸案内１９に上糸１１を掛けることができるため、このような困難な作業を省くことができ作業効率を向上させることができる。また、この糸掛け機構１８により第１糸案内１９に上糸１１を掛ける際に、同時に第２糸案内２０にも上糸１１を掛けることができ、第２糸案内２０に上糸１１を掛ける手間も省くことができる。
【００９２】
２）リンク部材１４５の基端部が従動ピン１４６を介してカム板１４７のカム溝１４７ａに案内されているため、糸カセット１０の装着動作に連動して操作力付加部材１２４に作用した操作力がリンク部材１４５を介して回動アーム１２２の操作力入力部１２２ａに伝達される際に、リンク部材１４５は左右方向に水平に且つスムーズに移動することができる。従って、先端アーム部１４５ａは回動アーム１２２の操作力入力部１２２ａをほぼ水平に右方へ押圧することができ、先端アーム部１４５ａと操作力入力部１２２ａとの間で滑り摩擦が生じるのを極力抑えることができる。即ち、糸カセット１０を装着する力が小さくて済む。
【００９３】
３）第１糸案内１９と第２糸案内２０の糸掛け部１９ａ，２０ａは夫々略同方向（右方）へ開口し、フック部材１２３の作用位置は待機位置よりもこれら糸掛け部１９ａ，２０ａの開口方向（右方）に位置し、第１糸案内１９と第２糸案内２０との間で、フック部材１２３は待機位置と作用位置との間を移動するように構成されているので、フック部材１２３が待機位置にあるときには、糸掛けフック１２３ａに上糸１１が掛かってしまうことはないし、フック部材１２３が作用位置に切換えられたときには、糸掛け部１９ａ，２０ａの開口方向に位置する上糸１１を糸掛けフック１２３ａに掛けることができる。
【００９４】
さらに、第１糸案内１９と第２糸案内２０との間でフック部材１２３が待機位置と作用位置との間を移動することになるので、上糸１１が糸掛けフック１２３ａに掛かった状態でフック部材１２３を糸掛け部１９ａ，２０ａの開口方向と反対側に移動させることで、上糸１１が糸掛け部１９ａ，２０ａの奥端部に入り込むため、確実に上糸１１を第１、第２糸案内１９，２０へ掛けることができる。
【００９５】
４）回動アーム１２２の操作力入力部１２２ａに操作力伝達機構１２５を介して操作力が伝達されると、第１揺動により糸掛けフック１２３ａに上糸１１を係合させ、その状態でスライド移動により糸掛けフック１２３ａに係合した上糸１１を糸案内１９，２０側へ引き寄せて糸案内１９，２０へ上糸１１を掛け、最後に第２揺動により糸掛けフック１２３ａと上糸１１との係合を解除する。つまり、このようなフック部材１２３の３段階の動作により、上糸１１を自動的に、且つ確実に糸案内１９，２０へ掛けることができる。さらに、スライド移動（第２移動）の際には、糸掛けフック１２３ａに係合した上糸１１は、糸案内１９，２０の糸掛け部１９ａ，２０ａの開口端から奥端側へ移動させられるため、上糸１１は糸案内１９，２０の奥端部に確実に掛けられることになる。
【００９６】
５）カセット装着部５に糸カセット１０が装着されていない場合には、フック部材１２３は第１、第２糸案内１９，２０に近い第１の待機位置にあるため、糸カセット１０が装着されると、フック部材１２３はその第１の待機位置から作用位置へ切換えられるため、糸案内１９，２０への糸掛け動作を即座に開始することができる。一方、糸カセット１０の装着完了後には、フック部材１２３は第１の待機位置よりも糸案内１９，２０から離れた第２の待機位置にあり、フック部材１２３が針棒１２から離れているため、縫製作業中にフック部材１２３に上糸１１が絡むのを防止することができる。
【００９７】
６）ミシンＭは、頭部４にカセット装着部５が設けられてミシンＭの上方より糸カセット１０をカセット装着部５に挿入するように構成されており、作業者が糸カセット１０を両手で押して装着する場合には、作業者の両手が頭部４の上方に位置することになる。即ち、作業者の両手が頭部４の下方に設けられた第１、第２糸案内１９，２０からかなり離れた状態である。しかし、本実施形態では、糸カセット１０の装着動作に連動して第１、第２糸案内１９，２０にも上糸１１が掛けられるため、糸カセット１０を装着した後に、頭部４の上方にある手をわざわざ頭部４の下方の第１、第２糸案内１９，２０まで移動させる必要がなく、縫製の準備作業を円滑に行うことができる。
【００９８】
次に、前記実施形態に種々の変更を加えた変更形態について説明する。
【００９９】
１］糸カセット１０に収容される糸供給源としては、糸駒やボビンで構成したものや、単なる糸の塊からなるものなど、種々の形態のものを使用できる。また、糸供給源である糸駒や糸の塊の周囲を覆わず露出した状態で、これら糸駒や糸の塊を糸立棒に通しただけの構成の糸カセットであってもよい。
【０１００】
２］前記実施形態においては、作業者自らが糸カセット１０をカセット装着部５に押し込んで糸カセット１０を装着するように構成しているが、ゴムローラ　（本願出願人の出願である特願２００２−１８９５１７号参照）やモータ等の他の駆動手段を用いて糸カセット１０を自動的に装着するように構成して、この駆動手段によって糸保持機構１７や糸掛け機構１８が駆動されるように構成してもよい。さらに、２つの糸案内１９，２０に糸が掛けられるのであれば、手動操作レバーによって糸保持機構１７や糸掛け機構１８が駆動されるように構成してもよい。
【０１０１】
３］前記実施形態においては、第１糸案内１９と第２糸案内２０は夫々略右方へ開口し且つ水平に形成された糸掛け部１９ａ，２０ａを有し、フック部材１２３を略水平に待機位置と作用位置とに亙って移動することで、糸掛けフック１２３ａに上糸１１を掛けるように構成されているが、フック部材１２３ａを斜め下向き４５度の方向に左から右へ移動するように構成してもよい。逆に、第１糸案内１９と第２糸案内２０の糸掛け部１９ａ，２０ａが夫々右方へ開口し且つ夫々上向き略４５度の方向に延びるように形成して、フック部材１２３を水平に左から右へ移動するように構成してもよい。
【０１０２】
４］糸掛け機構のベース部材を、ミシンフレームやミシンフレームを覆うカバーに一体的に設けてもよい。この場合には、可動部材、ストッパ部材及びコイルバネが、ミシンフレーム又はミシンフレームを覆うカバーに直接設けられることになる。
【０１０３】
【発明の効果】請求項１の発明によれば、糸カセットの装着動作に連動して自動的に糸案内へ糸が掛けられるので、縫針の目孔への糸通し後に作業者自らが糸案内に糸を掛ける手間が省け、作業効率を向上させることができる。
【０１０４】
請求項２の発明によれば、第１糸案内へ前記糸を掛ける際に、第１糸案内から所定距離離れた第２糸案内にも糸が掛けられるので、第２糸案内へ糸を掛ける手間が省け、作業効率を向上させることができる。
【０１０５】
請求項３の発明によれば、回動アームとフック部材が可動部材とともにベース部材に対してスライド移動するため、糸掛けフックに掛けられた糸が糸案内側へ引き込まれ、糸案内に確実に糸が掛けられる。また、第１糸案内が、ミシン頭部にある程度接近して位置するため、糸通し動作や布の出入などの縫製の準備時には作業者自らが第１糸案内に糸を掛けるのは困難であるが、前述のように、糸カセットの装着動作に連動してこの第１糸案内に糸を掛けることができるため、作業効率を向上させることができる。
【０１０６】
請求項４の発明によれば、先端アーム部は回動アームの操作力入力部をほぼ水平に押圧し、先端アーム部と操作力入力部との間で滑り摩擦が生じるのを極力抑え、小さな操作力でも糸掛け動作を行うことができる。
【０１０７】
請求項５の発明によれば、第１揺動によりフック部材を作用位置に切換えた状態で、第１糸案内へ糸を掛けるスライド移動が行われるため、糸掛けフックに糸が掛けられた状態で第１糸案内側へフック部材が引き寄せられることになり、その第１糸案内に確実に糸を掛けることができる。さらに、第２揺動により、フック部材を待機位置へ復帰揺動させ、糸掛けフックから糸を外すことが可能になり、その糸を糸掛けフックから取り外す手間を省いて作業を円滑に行える。
【０１０８】
請求項６の発明によれば、操作力付加部材にフック部材を操作する為の操作力が作用したときには、この操作力はフック部材に伝達されてフック部材が待機位置と作用位置とに亙って切換えられるが、このときに、針棒の下部の第１糸案内だけではなく、この第１糸案内から所定距離離れた第２糸案内にも糸が掛けられるため、第２糸案内に糸を掛ける手間が省くことができ、作業効率の向上が可能になる。
【０１０９】
請求項７の発明によれば、糸掛けフックに糸を掛ける作用位置が、待機位置よりも第１、第２糸案内の糸掛け部の開口方向に位置するため、フック部材が待機位置にあるときには、たとえ、糸がたるんで糸掛け部の開口付近に糸が位置したとしても、糸掛けフックに糸が不用意に掛かってしまうことはないし、フック部材が作用位置に切換えられたときには、糸を糸掛けフックに掛けることができる。さらに、第１糸案内と第２糸案内との間でフック部材が待機位置と作用位置との間を移動することになるので、糸が糸掛けフックに掛かった状態でフック部材を糸掛け部の開口方向と反対側に移動させることで、糸が糸掛け部の奥端部に入り込むため、確実に糸を第１、第２糸案内へ掛けることができる。
【０１１０】
請求項８の発明によれば、ミシンが請求項１と同じ構成の糸掛け装置を備えたので、請求項１と略同様の効果が得られる。
【０１１１】
請求項９の発明によれば、ミシンが請求項６と同じ構成の糸掛け装置を備えたので、請求項６と略同様の効果が得られる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るミシンの正面図である。
【図２】ミシンの一部切欠正面図である。
【図３】図１の要部拡大図である。
【図４】糸カセットの正面図である。
【図５】糸カセットの左側面図である。
【図６】糸カセットの右側面図である。
【図７】糸カセットの底面図である。
【図８】糸通し機構の構成図であり、（ａ）は左側面図、（ｂ）は正面図である。
【図９】フック機構の作動状態を示す斜視図であり、（ａ）は糸通し直前の状態を示し、（ｂ）は糸通しが完了した状態を示す。
【図１０】糸通し動作完了後の頭部の要部側面図である。
【図１１】保持部材及び可動フレームを示す図であり、（ａ）は左側面図、（ｂ）は正面図、（ｃ）は右側面図である。
【図１２】保持部材及び連動移動機構の側面図である。
【図１３】保持部材支持体の側面図であり、（ａ）は左側面図、（ｂ）は右側面図である。
【図１４】保持部材及び糸挟持部材の動作状態（保持部材移動直前）を示す図である。
【図１５】保持部材及び糸挟持部材の動作状態（保持部材移動開始直後）を示す図である。
【図１６】保持部材及び糸挟持部材の動作状態（糸挟持部材揺動開始時）を示す図である。
【図１７】保持部材及び糸挟持部材の動作状態（糸挟持部材最大揺動状態）を示す図である。
【図１８】保持部材及び糸挟持部材の動作状態（糸挟持部材揺動終了時）を示す図である。
【図１９】保持部材及び糸挟持部材の動作状態（上糸挟持状態）を示す図である。
【図２０】糸通し動作時におけるフック機構及び保持部材の一部平面図である。
【図２１】糸通し動作時における図２０の側面図である。
【図２２】糸通し動作直後の頭部の要部側面図である。
【図２３】保持部材及び糸挟持部材の動作状態（糸通し動作後）を示す図である。
【図２４】糸掛け機構の底面図（糸掛け動作直前）である。
【図２５】糸掛け機構の底面図（第１揺動後）である。
【図２６】糸掛け機構の底面図（スライド移動後）である。
【図２７】糸掛け機構の底面図（第２揺動後）である。
【図２８】図２４の正面図である。
【図２９】図２５の正面図である。
【図３０】図２６の正面図である。
【図３１】図２７の正面図である。
【符号の説明】
Ｍ　　　ミシン
４　　　頭部
５　　　カセット装着部
１０　　糸カセット
１１　　上糸
１５　　縫針
１８　　糸掛け機構
１９　　第１糸案内
１９ａ　糸掛け部
２０　　第２糸案内
２０ａ　糸掛け部
１２１　可動部材
１２２　回動アーム
１２２ａ　操作力入力部
１２３　フック部材
１２３ａ　糸掛けフック
１２４　操作力付加部材
１２５　操作力伝達機構
１４５　リンク部材
１４５ａ　先端アーム部
１４６　従動ピン
１４７　カム板
１４７ａ　カム溝[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread hooking device for a thread guide and a sewing machine provided with the thread hooking device, in particular, it is possible to automatically thread a thread on a thread guide below a needle bar. About what you did.
[0002]
2. Description of the Related Art Conventionally, a needle bar of a sewing machine is often provided with a thread guide for guiding a thread from a balance to an eye of a sewing needle along the needle bar. It is necessary to thread a thread on this thread guide before threading the eye of the sewing needle supported by the section. Here, in recent years, various sewing machines configured to automatically perform the threading operation have been proposed or put into practical use. However, even in these sewing machines, the thread before the automatic threading operation is performed. The threading work for the guide was performed manually by the worker himself.
[0003]
However, in preparation for sewing, the thread guide may be very close to the sewing machine head depending on the stop position of the needle bar. For example, regardless of whether the sewing machine is provided with a threading device or not, the needle bar needs to be at a position close to the uppermost position in order to pass the thread through the eye of the sewing needle. The thread guide is in a state of approaching the sewing machine head. Alternatively, when the needle bar is moved up and down to take in and out the cloth between the sewing needle and the bed portion, the thread guide comes close to the sewing machine head. In this approaching state, it is difficult for the operator to thread the thread guide, because the operator has difficulty seeing the thread guide or the gap between the thread guide and the sewing machine head is narrow. In addition, it takes extra time and effort to hang the thread on the thread guide after lowering the position of the needle bar after the completion of the threading and the in / out of the cloth, which leads to a decrease in work efficiency.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to efficiently perform a sewing preparation operation by automatically performing a thread hooking operation on a thread guide when a thread cassette is mounted.
[0005]
According to a first aspect of the present invention, there is provided a thread guide for a thread guide which accommodates a thread supply source and is removably mounted on a cassette mounting portion of a sewing machine, and a needle for supporting a sewing needle. A thread hooking device for a thread guide of a sewing machine provided with a first thread guide at a lower portion of a rod, the thread hook having a thread hook, and a standby position where the thread led out of the thread cassette is not hooked on the thread hook. A hook member movable between a hook position and an operation position where the hook can be hooked; and an operation force applying member for applying an operation force for switching the hook member between a standby position and an operation position. The hook member is switched between a standby position and an operation position by an operating force applied to the operating force applying member from the yarn cassette in conjunction with the mounting operation of the cassette, so that the yarn is hooked on the first yarn guide. It is what was constituted.
[0006]
The thread hooking device for the thread guide hooks the thread on the thread hook by switching the hook member from a standby position where the thread led out of the thread cassette is not hooked to the thread hook to an operation position where the thread can be hooked. It is configured to hang the yarn on the yarn guide. Here, the operating force for switching the hook member acts on the operating force adding member in conjunction with the mounting operation of the yarn cassette when the yarn cassette is mounted on the cassette mounting portion, and this operating force is applied. The hook member is switched between the standby position and the operating position by being transmitted from the operating force applying member to the hook member. By configuring the yarn hooking device in this manner, the yarn is automatically hooked on the yarn guide in conjunction with the mounting operation of the yarn cassette.
[0007]
According to the second aspect of the present invention, when the yarn is hooked on the first yarn guide, the second yarn guide separated from the first yarn guide by a predetermined distance is also provided. It is configured to hang a thread. When the yarn is hooked on the first yarn guide, the yarn is also hooked on the second yarn guide at the same time.
[0008]
According to a third aspect of the present invention, in the first or second aspect, the first thread guide is located below the head of the sewing machine and is fixed to a lower portion of the head of the sewing machine. A movable member slidably attached to the base member, a pivot arm pivotally attached to the movable member and interlockingly connected to the hook member, and having an operation force input unit for inputting the operation force, An operating force transmitting mechanism for transmitting an operating force applied to the operating force applying member to an operating force input portion of the rotating arm.
[0009]
When an operation force for switching the hook member is applied to the operation force applying member in conjunction with the mounting operation of the thread cassette, the operation force is transmitted to the operation force input unit of the rotating arm by the operation force transmission mechanism. Since the rotating arm is pivotally attached to the movable member and is interlocked with the hook member, when an operating force is input to the operating force input unit, the rotating arm rotates by a predetermined angle, and when the operating force is input, the rotating arm rotates by a predetermined angle. In conjunction with this, the hook member is switched from the standby position to the operation position.
[0010]
When the hook member is switched to the operation position and the thread is hooked on the thread hook, the rotating arm and the hook member slide with the movable member with respect to the base member. The drawn yarn is drawn to the yarn guide side, and the yarn is hung on the yarn guide.
[0011]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the operating force transmitting mechanism includes a link member pivotally connected to the operating force applying member such that a middle portion thereof is rotatable. A distal arm portion formed to be bent downward at the distal end of the member, a driven pin provided at a base end of the link member, and a cam plate having an arc-shaped cam groove with which the driven pin is engaged. It is provided.
[0012]
The operating force applied to the operating force applying member in conjunction with the mounting operation of the thread cassette is transmitted to the operating force input portion of the rotating arm via the link member, but the base end of the link member is driven via the driven pin. Since the guide member is guided by the cam groove of the cam plate, the link member moves smoothly in the horizontal direction, so that the operating force input portion of the rotating arm is pressed almost horizontally by the distal arm portion, and the distal arm portion is operated. The occurrence of sliding friction with the force input section is minimized.
[0013]
According to a fifth aspect of the present invention, in the yarn guiding device according to the fourth aspect, the lower end portion of the distal end arm portion is brought into contact with the operating force input portion of the rotating arm when the yarn cassette is mounted. A first swing for driving the rotary arm in a substantially horizontal direction by the tip arm portion to switch the hook member from a standby position to an operating position, and the hook member switched to an operating position and the rotation The arm is slid along with the movable member to slide the arm on the first thread guide, and after the thread is hooked, the hook is returned to the standby position. Things.
[0014]
When an operation force for switching the hook member is applied to the operation force applying member by the operation of mounting the thread cassette, the operation force is transmitted from the distal end arm portion of the link member to the operation force input portion of the rotation arm, and substantially rotates the rotation arm. Drive horizontally. Then, the rotation arm is rotated by a predetermined angle, and the first swing is performed in which the hook member swings from the standby position to the operation position in conjunction with the rotation, and the thread is hooked on the thread hook.
[0015]
Subsequently, when an operating force is input to the operating force input portion of the rotating arm, the rotating arm and the hook member are slid together with the movable member in a state where the hook member is switched to the operating position, and the first thread guide is moved to the first thread guide. The slide movement for hanging the thread is performed. At this time, since the hook member is attracted to the first yarn guide side in a state where the yarn is hooked on the yarn hook, the yarn is hooked on the first yarn guide. Further, when the operating force is input to the operating force input unit, a second swing is performed to swing the hook member back to the standby position, and the thread can be removed from the thread hook.
[0016]
7. The thread guide for a thread guide according to claim 6, wherein the thread guide of the sewing machine includes a first thread guide below a needle bar for supporting a sewing needle, and a second thread guide separated from the first thread guide by a predetermined distance. A hook member having a thread hook, being movable between a standby position where no thread is hooked on the thread hook and an operation position where thread can be hooked; An operating force applying member for applying an operating force for switching between the position and the operating position, wherein the hook member is moved between the standby position and the operating position by the operating force applied to the operating force applying member. The yarns are configured to be switched and the yarns are hung on the first yarn guide and the second yarn guide.
[0017]
When an operating force for operating the hook member is applied to the operating force applying member from another member or the like other than the operating force adding member, the operating force is transmitted to the hook member and the hook member is moved between the standby position and the operating position. Is switched over. At this time, the yarn is hooked not only on the first yarn guide at the lower portion of the needle bar, but also on the second yarn guide separated from the first yarn guide by a predetermined distance.
[0018]
According to a seventh aspect of the present invention, in the yarn guiding device according to the sixth aspect, the first thread guide and the second thread guide are thread catching portions for threading the thread, and are substantially in the same direction. Each of the first and second thread guides has an opening in which the hook member is operated, and an operation position of the hook member is located closer to an opening direction of the thread hooker than a standby position. The member moves between the standby position and the operation position.
[0019]
Since the operation position where the yarn is hooked on the yarn hook is located closer to the opening direction of the yarn hooking portions of the first and second yarn guides than the standby position, when the hook member is at the standby position, even if the yarn is slackened, Even if the thread is located near the opening of the thread hook, the thread hook and the thread are separated. Then, when the hook member is switched to the operation position, the thread is hooked on the thread hook. Further, the hook member moves between the standby position and the operation position between the first yarn guide and the second yarn guide, and the hook member is moved in the opening direction of the yarn hooking portion in a state where the yarn is hooked on the yarn hook. By moving the yarn to the opposite side, the yarn enters the deep end of the yarn hooking portion, and the yarn is hooked on the first and second yarn guides.
[0020]
The sewing machine according to claim 8, further comprising a thread cassette accommodating a thread supply source and removably attached to a cassette attachment portion of the sewing machine, and a first thread guide below a needle bar that supports a sewing needle. A yarn hooking device for hanging the yarn on the first yarn guide, the yarn hooking device having a yarn hook, and a standby position where the yarn led from the yarn cassette is not hooked on the yarn hook; A hook member movable between a possible operating position and an operating force applying member for applying an operating force for switching the hook member between a standby position and an operating position; The hook member is switched between a standby position and an operating position by an operating force applied to the operating force applying member from the yarn cassette in conjunction with an operation, and the yarn is threaded on the first yarn guide. What constituted the hanging device A. Since this sewing machine is provided with the thread hooking device having the same configuration as that of the first aspect, the operation thereof is substantially the same as that of the first aspect, and a description thereof will be omitted.
[0021]
The sewing machine according to claim 9, further comprising: a first thread guide at a lower portion of a needle bar that supports a sewing needle; and a second thread guide separated by a predetermined distance from the first thread guide. A thread hooking device for threading the second thread guide; the thread hooking device having a thread hook; a standby position where no thread is hooked on the thread hook; A hook member which can move between the hook member and an operating force applying member for applying an operating force for switching the hook member between the standby position and the operating position. The yarn hooking device is configured to switch the hook member between a standby position and an operation position and to hook the yarn on the first yarn guide and the second yarn guide. Since this sewing machine is provided with the thread hooking device having the same configuration as that of the sixth aspect, its operation is substantially the same as that of the sixth aspect, and a description thereof will be omitted.
[0022]
Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example of a case where the present invention is applied to a household sewing machine configured to automatically thread a hole of a sewing needle in conjunction with a mounting operation of a thread cassette.
[0023]
As shown in FIGS. 1 and 2, the household sewing machine M includes a bed 1 having a horizontal bed surface, a pillar 2 erected on the right end of the bed 1, and a pillar 2. It has an arm 3 extending leftward from the upper part so as to face the bed 1 and a head 4 provided at the left end of the arm 3. The head 4 is provided with a cassette mounting section 5 to which the thread cassette 10 is detachably mounted, and the upper thread 11 is led out of the thread cassette 10 mounted on the cassette mounting section 5. The head 4 of the arm 3 is provided with operation switches (not shown) such as a sewing start switch and a sewing end switch. Further, the arm unit 3 is provided with a liquid crystal display 7 having a screen facing the front.
[0024]
As shown in FIGS. 2 and 3, the head 4 has a needle bar 12, a balance 13 (see FIG. 10), a thread tension mechanism 14 for adjusting the thread tension of the upper thread 11 derived from the thread cassette 10, and a thread. A threading mechanism 16 for automatically threading the upper thread 11 through the eye 15a of the sewing needle 15 supported by the needle bar 12 when the cassette 10 is mounted on the cassette mounting portion 5; The main part of the thread holding mechanism 17 for holding the upper thread 11 near the eye hole 15a of the sewing needle 15 is provided at the lower end of the needle bar 12 when the thread cassette 10 is mounted on the cassette mounting portion 5. A thread hooking mechanism 18 and the like for automatically hooking the first thread guide 19 and the second thread guide 20 provided near the lower end of the head 4 are provided.
[0025]
The two thread guides 19 and 20 are respectively provided at positions below the head 4 at a predetermined distance, and the two thread guides 19 and 20 are thread catching portions 19a and 20a for threading the upper thread 11, respectively (FIG. 24). 27), and both of the threading portions 19a and 20a are formed substantially horizontally so as to open in substantially the same direction (rightward). Although not shown, the head 4 also has a needle bar vertical movement mechanism for vertically moving the needle bar 12, a needle bar swing mechanism for swinging the needle bar 12, and a balance drive mechanism for swinging the balance 13 up and down. Has been.
[0026]
As shown in FIGS. 1 and 2, the upper thread 11 led out from the thread cassette 10 mounted on the cassette mounting section 5 has a thread tension shaft (not shown in the drawing) between a pair of thread tension discs of a thread tension mechanism 14. ) Is hung from above, and the upper thread 11 extending downstream from the thread tension axis is hung on the balance 13. Further, the upper thread 11 extending from the balance 13 to the downstream side is held near the eye hole 15a of the sewing needle 15 by the thread holding mechanism 17, then passed through the eye hole 15a by the threading mechanism 16, and is moved by the thread hooking mechanism 18. The upper thread 11 is hung on the two thread guides 19 and 20, and the upper thread 11 is set so as to be sewable. Here, as will be described later, the respective operations of the threading mechanism 16, the thread holding mechanism 17, and the thread hooking mechanism 18 are automatically performed in conjunction with the mounting operation of the thread cassette 10.
[0027]
On the other hand, the bed 1 is provided with a bobbin mounting section (not shown), and a thread extending from the bobbin (not shown) mounted on the bobbin mounting section is used as a lower thread. Further, the bed unit 1 is provided with a shuttle mechanism (not shown). When the sewing machine motor (not shown) is driven in a state where the upper thread 11 and the lower thread are set to be sewable, the needle bar 12 is moved up and down by the needle bar up / down movement mechanism, and the shuttle mechanism is driven in synchronization with this. Then, the upper thread 11 near the sewing needle 15 descending below the needle plate 1a of the bed portion 1 is hooked by the shuttle mechanism, and the upper thread 11 and the lower thread are entangled to form a seam. .
[0028]
Here, the yarn cassette 10 will be described. As shown in FIGS. 4 to 7, the thread cassette 10 has a cassette body 30 and an opening / closing member 31 pivotally attached to the cassette body 30, and a thread spool 32 as a thread supply source is provided therein. A yarn storage section 33 for storing is formed. A thread stand 34 is attached to the opening / closing member 31, and when the opening / closing member 31 is opened forward (see FIG. 5), the thread spool 32 can be attached to and detached from the thread stand 34, and the thread spool 32 is attached to the thread stand 32. When the opening / closing member 31 is closed in a state where the thread spool 32 is mounted on the thread 34, the thread spool 32 is accommodated in the thread accommodating portion 33.
[0029]
The upper thread 11 is set as follows in a state of the thread cassette 10 which is ready to be mounted on the cassette mounting section 5. That is, the upper thread 11 extends upward from the thread spool 32 and is led out of the thread accommodating portion 33. From there, it passes through the thread path 35 between the cassette body 30 and the left end of the opening / closing member 31, and passes through the lower left of the thread cassette 10. It is hung on the end threading portion 36a. From here, the upper thread 11 extends to the right and is hooked on the thread hook 36b at the lower end of the partition wall 37 and the thread hook 36c at the lower right of the thread cassette 10, and further extends forward, and then the thread hook 36d The thread holding unit 38 makes a U-turn, extends leftward, is held by the thread holding unit 38, is further cut by the blade 39 on the left side of the thread holding unit 38, and is hung on the thread hooking unit 36e.
[0030]
On the right side of the thread cassette 10, a balance guide space 40 opened rearward and downward is formed over substantially the entire vertical length, and a thread tension space opened downward at the center of the lower end of the thread cassette 10. A space 41 is formed, and these spaces 40 and 41 are partitioned by a partition wall 37. A pair of left and right relief grooves 43a, 43b for preventing the holding member 70 of the yarn holding mechanism 17 from interfering with the front part of the right side of the yarn cassette 10 is provided on the front surface of the right side of the yarn cassette 10. Is formed.
[0031]
When the thread cassette 10 is lowered and inserted into the cassette mounting portion 5, the balance 13 enters the balance guide space 40 from below, and the thread tension mechanism 14 enters the thread tension space 41 from below. When the thread cassette 10 is slightly inserted into the cassette mounting portion 5, first, the thread portion 11a between the thread hooking portions 36b and 36c of the upper thread 11 is hooked on the balance 13 that has entered the balance guide space 40.
[0032]
When the thread cassette 10 is further inserted into the cassette mounting portion 5 from this state, the thread portion 11b between the thread hooking portions 36a and 36b is held by the thread tension mechanism 14 that has entered the thread tension space 41. On the other hand, the thread portion 11c between the thread hooking portion 36d and the thread holding portion 38 is pulled and held by the thread holding mechanism 17 to the vicinity of the eye 15a of the sewing needle 15 (see FIG. 22). In addition, a cam member 42 (described later) that swings and drives the yarn holding member 74 of the yarn holding mechanism 17 is provided between the yarn hooking portion 36d and the yarn holding portion 38.
[0033]
Next, the threading mechanism 16 will be described. As shown in FIG. 8, the threading mechanism 16 includes a threading shaft 50 and a slider guide shaft 51 movably arranged on the left side of the needle bar 12, and upper ends of the threading shaft 50 and the slider guide shaft 51. The upper thread 11 is passed through the eye 15a of the sewing needle 15 in conjunction with the rotation of the threading shaft 50, which is connected to the lower end of the threading shaft 50 and the threading slider 52 which is externally fitted to the portion so as to be vertically movable. A hook mechanism 53 and a threading shaft driving member 54 that drives the threading shaft 50 downward in conjunction with the mounting operation of the thread cassette 10 are provided.
[0034]
The threading shaft 50 and the slider guide shaft 51 are supported by the needle bar base 55 together with the needle bar 12, and the needle bar 12, the needle bar base 55, the threading shaft 50, and the slider guide shaft 51 swing the needle bar. It is arranged so that it can swing integrally by a mechanism. Here, it is necessary to set the needle bar 12 (sewing needle 15) at a predetermined position such that the upper thread 11 held by the thread holding mechanism 17 described later can be passed through the eye 15a by the hook mechanism 53. Therefore, in a state immediately before the threading operation by the threading mechanism 16 (a state immediately before the installation of the thread cassette 10), the needle bar 12 is at a position pivoted to the leftmost side. Further, also in the vertical position, the needle bar 12 is at a position where the upper thread 11 can pass through the eye hole 15a, specifically, a predetermined position slightly lower than the uppermost position.
[0035]
Pin members 56a and 56b project from an upper end portion of the threading shaft 50 and a middle portion in the vertical direction, respectively. When the threading shaft 50 is lowered by a predetermined amount, the pin member 56b is positioned halfway in the vertical direction of the needle bar 12. It engages with the fixed regulating member 12c. Further, the threading shaft 50 is provided with a coil spring 57 for urging the threading slider 52 upward. A coil spring 58 that urges the threading slider 52 upward is provided on the upper half of the slider guide shaft 51. The threading slider 52 has a cam groove 52a formed of a straight groove in the upper half and a spiral groove in the lower half. Further, the threading slider 52 is also provided with a protruding plate 59 protruding upward. A horizontal surface (not shown) is formed on the rear side of the protruding plate 59.
[0036]
As shown in FIGS. 8 and 9, the hook mechanism 53 includes a threading hook 60 for hooking the upper thread 11, two guide members 61 and 62 located on both sides of the threading hook 60, And a thread holding wire 63 penetrating horizontally through the guide members 61 and 62, and a hook holding member 64 fixed to the lower end of the threading shaft 50 and holding the threading hook 60 and the guide members 61 and 62. As shown in FIG. 9, a hook portion 60a is formed at the distal end of the threading hook 60. At the time of threading, the hook portion 60a is inserted into the eye 15a of the sewing needle 15, and the threading hook 60 is The upper thread 11 held near the eye hole 15a by the thread holding mechanism 17, which will be described later, is hooked while being guided by the two guide members 61 and 62 from both sides.
[0037]
The threading shaft drive member 54 is rotatably connected to a slide member 66 which is fitted to the guide shaft 65 so as to be slidable up and down, and is urged in a clockwise direction in FIG. ing. On the other hand, the slide member 66 is urged upward by a coil spring 68. At the upper end of the threading shaft driving member 54, a driving force transmitting portion 54a is formed which contacts the horizontal surface of the projecting plate 59 and transmits the driving force when the thread cassette 10 is mounted to the threading slider 52. At the lower end of the driving member 54, a cam portion 54b for blocking transmission of driving force to the threading slider 52 is formed. On the other hand, a cam member 69 having an inclined tip cam portion 69a is fixed to the lower end portion of the guide shaft 65. When the threading shaft driving member 54 moves downward by a predetermined amount, the cam is moved to the tip cam portion 69a. The portion 54b comes into contact.
[0038]
The threading operation by the threading mechanism 16 will be described. When the threading shaft driving member 54 is driven downward against the urging force of the coil spring 68 in conjunction with the mounting operation of the thread cassette 10, the driving force transmitting portion 54a comes into contact with the horizontal surface of the projecting plate 59, and Since the driving force is transmitted to the projecting plate 59 of the threading slider 52, the threading shaft 50 and the slider guide shaft 51 also move downward. When the threading shaft 50 moves downward by a predetermined amount, the pin member 56b engages with the regulating member 12c and the threading shaft 50 no longer moves downward, but the threading slider 52 resists the urging force of the coil spring 58. And move further down. At this time, since the pin member 56a provided on the threading shaft 50 moves relatively along the cam groove 52a of the threading slider 52, the threading slider 52 moves downward with respect to the threading shaft 50. Is converted into a rotation operation of the threading shaft 50, and the threading shaft 50 rotates by a predetermined angle. At this time, as shown in FIG. 9A, the hook mechanism 53 provided at the lower end of the threading shaft 50 also rotates integrally with the threading shaft 50 toward the sewing needle 15 and the hook of the threading hook 60 is moved. The portion 60a passes through the eye 15a of the sewing needle 15 and hooks the upper thread 11.
[0039]
As shown in FIG. 9A, in a state where the hook portion 60a hooks the upper thread 11, the threading shaft driving member 54 moves downward to a predetermined position, and the cam portion 54b moves to the tip of the cam member 69. It comes into contact with the cam portion 69a. When the thread cassette 10 is further pushed into the cassette mounting portion 5 from this state and the threading shaft driving member 54 moves downward, the threading shaft driving member 54 resists the urging force of the torsion spring 67 by the distal end cam portion 69a. Then, it is driven to rotate in the counterclockwise direction in FIG.
[0040]
Then, the driving force transmitting portion 54a is separated from the horizontal plane of the protruding plate 59, so that the driving force for driving the threading shaft 50 downward to the threading slider 52 is not transmitted. Accordingly, the threading shaft 50 rotates in the opposite direction and returns upward due to the urging force of the coil spring 58, and the hook mechanism 53 also rotates in the direction away from the sewing needle 15 with the rotation. As shown, the threading hook 60 hooked with the upper thread 11 comes off from the eye hole 15a, and the threading operation is completed.
[0041]
Next, the thread holding mechanism 17 will be described. As shown in FIGS. 3, 6, and 10 to 12, the yarn holding mechanism 17 includes a holding member 70 including a pair of yarn holding portions 71 and 72 capable of holding the upper thread 11 at predetermined intervals, An interlocking movement mechanism 73 that moves a pair of thread holding portions 71 and 72 to the vicinity of the eye hole 15a of the sewing needle 15 in conjunction with the mounting operation of the thread cassette 10, and a left thread holding portion 71 that allows the upper thread 11 to be released. A thread holding member 74 to be held, a torsion spring 75 (biasing member) for elastically urging the thread holding member 74 toward the yarn holding side, and a torsion spring 75 attached to the cassette main body 30 of the thread cassette 10, And a cam member 42 that temporarily swings and drives the thread clamping member 74 to the clamping release side at a predetermined timing.
[0042]
Further, the thread holding mechanism 17 includes a main body frame 76 fixed to the head 4 and a movable frame 77 guided and supported by the main body frame 76 so as to be able to move up and down and to which the holding member 70 is fixed. And a movable frame 77 which is interlocked with the movable frame 77. The main body frame 76 includes a guide member 78 located on the left and right sides of the vertical swing path of the balance 13, and a pair of left and right guide plates 79 a and 79 b provided on the right side of the guide member 78 and guiding the movable frame 77 to move up and down. FIG. 3). The movable frame 77 is configured by connecting a pair of left and right movable plates 80a and 80b disposed between a pair of left and right guide plates 79a and 79b with a plurality of connection pins.
[0043]
First, the holding member 70 and the thread holding member 74 will be described. As shown in FIG. 11, a pair of thread holding portions 71 and 72 of the holding member 70 are connected by a connecting member 81. The right end of the connecting member 81 extends horizontally to the right, and the connecting member 81 is fixed to the second wire 101 of the interlocking movement mechanism 73 via a holding member support 104 described later. The thread holding portions 71 and 72 are formed with concave portions 71a and 72a, respectively, for hooking the upper thread 11 when the thread cassette 10 is mounted. A thread holding member 74 is pivotally attached to the left thread holding section 71 via a pivot shaft 82, and a torsion spring 75 is mounted on the pivot shaft 82.
[0044]
A concave portion 74a for holding the upper thread 11 in cooperation with the left-hand thread holding portion 71 is formed in a front portion of the lower end portion of the thread holding member 74. A driven pin 84 operated by the cam member 42 described later is provided at a lower end portion of the thread holding member 74, while an upper end portion (pivot shaft) of the thread holding member 74 is provided as shown in FIG. On the opposite side of the driven pin 84 from the driven pin 82), a regulating pin 85 for regulating the thread holding member 74 from swinging to the thread holding side beyond a predetermined range is provided. Here, the driven pin 84 is configured to protrude leftward, and the restriction pin 85 is configured to protrude rightward opposite to the driven pin 84.
[0045]
Next, the interlocking movement mechanism 73 will be described. As shown in FIGS. 11 and 12, the interlocking movement mechanism 73 includes a cassette contact body 90 made of synthetic resin, which comes into contact with the thread cassette 10 and descends integrally with the thread cassette 10 when the thread cassette 10 is mounted, First and second moving pulley mechanisms 91 and 92 for moving the holding member 70 by four times the moving distance of the body 90 are provided. The cassette contact body 90 is disposed so as to be vertically movable between a pair of left and right guide plates 79a and 79b of the main body frame 76, and the lower end of the thread cassette 10 contacts the left end side of the cassette contact body 90. The contact portion 90a is formed so as to project leftward from the left guide plate 79a.
[0046]
The first moving pulley mechanism 91 includes a pulley 93 connected so as to move up and down integrally with the cassette contact body 90, a first wire 94 wound around the pulley 93 and having one end fixed to the guide plate 79b. A pulley 95 connected to the other end of the first wire 94 is provided. The pulley 93 is housed inside a pulley housing member 96 made of a synthetic resin, and the pulley housing member 96 vertically moves integrally with the pulley 93 between the pair of guide plates 79 a and 79 b below the cassette contact body 90. It is movably arranged. A coil spring 97 is provided between the cassette contact body 90 and the pulley accommodating member 96 to urge the cassette contact body 90 upward against the pulley 93. On the other hand, the pulley 93 (and the pulley housing member 96) is urged upward by a coil spring 98 for returning the movable frame 77 upward, and the lower end of the coil spring 98 is connected to the lower end of the left movable plate 80a. Have been.
[0047]
One end of the first wire 94 is fixed to a portion of the guide plate 79b above the cassette contact body 90, and the other end of the first wire 94 is connected to a pin member 99 connecting upper end portions of a pair of left and right movable plates 80a, 80b. Fixed. The pin member 99 is vertically movably supported along the guide groove 100 by a pair of left and right guide plates 79a and 79b, and the pulley 95 is rotatably supported by the pin member 99. Accordingly, in a state where the pin member 99 is guided by the guide groove 100, the pulley 95 and the movable plates 80a and 80b (the movable frame 77) can move up and down relatively with respect to the guide plates 79a and 79b (the fixed frame 76). is there.
[0048]
When the thread cassette 10 comes into contact with the cassette contact body 90 and the cassette contact body 90 is pushed down when the yarn cassette 10 is mounted, the pulley 93 is also pushed down integrally with the cassette contact body 90. At this time, since the pulley 93 acts as a moving pulley, the pulley 95, that is, the movable frame 77 moves downward by an amount twice as large as the amount of movement of the cassette contact body 90.
[0049]
The second moving pulley mechanism 92 includes a second wire 101 having both ends fixed to the guide plate 79b, and two pulleys 102 and 103 around which the second wire 101 is wound. The two pulleys 102 and 103 are rotatably supported by lower and upper ends of a pair of left and right movable plates 80a and 80b, respectively. One end of the second wire 101 is fixed to the upper end of the guide plate 79b, and the other end of the second wire 101 is fixed to the lower end of the guide plate 79b in a state where the second wire 101 is wound around the two pulleys 102 and 103. Fixed.
[0050]
As shown in FIGS. 12 and 13, a holding member support 104 made of synthetic resin is fixed to a portion of the second wire 101 between the two pulleys 102 and 103. The connecting member 81 of the holding member 70 is connected. The holding member support 104 and the connecting member 81 are supported vertically movable along a guide groove 105 between a pair of left and right movable plates 80a and 80b.
[0051]
When the pair of left and right movable plates 80a and 80b move downward by the first moving pulley mechanism 91, the two pulleys 102 and 103 also move downward with the movement of the movable plates 80a and 80b. Here, the pulley 102 acts as a moving pulley, and when the portion of the second wire 101 that is wound around the pulley 102 is pushed down by the pulley 102, the pulley 102 is moved twice as much as the moving amount of the pulley 102. The second wire 101 moves from the front side (right side in FIG. 12) to the rear side (left side in FIG. 12).
[0052]
That is, the holding member 70 connected to the portion of the second wire 101 between the pulleys 102 and 103 also moves downward by twice the moving amount of the pulley 102 (movable frame 77). That is, the amount of movement of the holding member 70 is four times the amount of movement of the thread cassette 10.
[0053]
Next, the cam member 42 will be described. As shown in FIGS. 4, 6, 7, and 10, the cam member 42 is integrally formed with the cassette body 30 so as to protrude forward from the front surface of the cassette body 30 on the right side of the rear end of the cassette body 30. Is formed. The cam member 42 has a protruding portion 110 protruding forward from the front surface of the cassette body 30 and a cam forming portion 111 extending rightward from a front end of the protruding portion 110. A pin passage 112 is formed between the cam forming portion 111 and the front surface of the thread cassette 10 so that the driven pin 84 relatively passes through the thread cassette 10 when the thread cassette 10 is mounted.
[0054]
A cam surface 111a on which the driven pin 84 relatively moves (slids) when the yarn cassette 10 is mounted is formed on a rear surface portion of the cam forming portion 111. The cam surface 111a has an upper inclined surface projecting rearward downward. And a lower inclined surface that is continuous with the lower end of the upper inclined surface and projects forward as it goes downward. That is, the cam surface 111a facing the front surface of the thread cassette 10 is formed so as to protrude rearward. The continuous portion between the upper inclined surface and the lower inclined surface is bent, and the cam surface 111a projects most rearward at the bent portion. Accordingly, as the yarn cassette 10 moves downward, the driven pin 84 passes through the pin passage 112 along the cam surface 111a, whereby the driven pin 84 is operated by the cam member 42, and the yarn clamping member 74 is moved. It will rock back and forth. At this time, the upper thread 11 is clamped between the thread holding section 71 and the thread clamping member 74. The yarn holding operation of the yarn holding mechanism 17 will be described mainly with reference to FIGS. 10 and 14 to 23, focusing on the holding operation of the upper yarn 11 by the yarn holding portion 71 and the yarn holding member 74.
[0055]
As shown in FIG. 14, in a state immediately after the thread cassette 10 comes into contact with the cassette contact body 90, the thread clamping member 74 is in a state of being urged to the thread clamping side by the torsion spring 75. From this state, as shown in FIG. 15, when the yarn cassette 10 is pushed into the cassette mounting portion 5, the holding member 70 starts to move downward in conjunction with the mounting operation of the yarn cassette 10, but as shown in FIG. Since the first and second moving pulley mechanisms 91 and 92 move the holding member 70 four times as much as the yarn cassette 10, the holding member 70 moves downward relative to the yarn cassette 10. Will be.
[0056]
Then, as shown in FIG. 16, when the driven pin 84 reaches the pin passage 112 formed inside the cam member 42, the driven pin 84 is pressed rearward by the cam surface 111a, and the yarn is pinched accordingly. The member 74 starts to swing around the pivot shaft 82 toward the pinching release side. Further, when the holding member 70 moves downward and the driven pin 84 reaches the most rearwardly protruding portion of the cam surface 111a, as shown in FIG. At this time, the thread portion 11c (see FIGS. 4 and 7) of the upper thread 11 stretched to the front side of the thread cassette 10 is located between the recess 71a of the thread holding section 71 and the recess 74a of the thread holding member 74. Will get into it.
[0057]
Further, when the driven pin 84 relatively moves downward along the cam surface 111a and passes through the most protruding portion of the cam surface 111a in the pin passage 112, the thread pinching member 74 becomes a torsion spring 75 (FIG. 11B). ) And starts swinging to the thread clamp side. Then, as shown in FIG. 18, when the driven pin 84 comes out of the pin passage 112 and does not come into contact with the cam surface 111a, the upper thread is moved between the concave portion 71a of the thread holding portion 71 and the concave portion 74a of the thread holding member 74. 11 will be pinched. The regulating pin 85 is separated upward from the recess 71 a of the thread holding section 71 and the recess 74 a of the thread holding member 74.
[0058]
With the upper thread 11 held in this manner, as shown in FIG. 19, the movable frame 77 further moves downward, and the upper thread 11 is placed near the eye hole 15a of the sewing needle 15 in the thread holding section. The state is held by 71 and 72. At this time, as shown in FIG. 20, the hook mechanism 53 of the above-described threading mechanism 16 rotates clockwise in FIG. 20, and the threading hook 60 passes through the eye hole 15a.
[0059]
Here, when the holding member 70 moves to the vicinity of the eye hole 15a of the sewing needle 15, the cassette contact body 90 that has been in contact with the lower end of the thread cassette 10 and has been depressed is separated from the thread cassette 10 and returned to the return coil spring. The pulley 93 moves upward by the biasing force of 98, and the movable frame 77 and the holding member 70 start moving upward accordingly. At this time, the upper thread 11 held by the pair of thread holding portions 71 and 72 of the holding member 70 is hooked on the threading hook 60, and the threader hook 60 hooks the upper thread 11 as described above. When the hook mechanism 53 returns in the counterclockwise direction in FIG. 20, the upper thread 11 is passed through the eye hole 15a as shown in FIGS.
[0060]
After the upper thread 11 is passed through the eye hole 15a, the holding member 70 moves upward together with the movable frame 77, but when the above-described holding member 70 moves downward (see FIG. 18), FIG. As shown in the figure, since the position at which the connecting member 81 engages with the guide groove 105 is different, the driven pin 84 and the cam surface 111a of the cam member 42 are separated from each other. It will return upward. Note that the restriction pin 85 is on the right side of the thread holding member 74 and is separated rightward from the cam member 42, so that the restriction pin 85 does not hinder the vertical movement of the holding member 70.
[0061]
Next, the thread hooking mechanism 18 will be described. As shown in FIGS. 3 and 24 to 31, the thread hooking mechanism 18 is provided with a horizontal plate-shaped base member 120 fixed to a lower portion of the head 4, and slidably provided below the base member 120. A movable member 121, a rotating arm 122 pivotally attached to the lower side of the movable member 121, and a hook member 123 pivotally attached to the lower side of the movable member 121 and having a thread hook 123a at a tip thereof. The thread can be swung between a standby position (see FIGS. 24 and 28) where the upper thread 11 derived from the thread cassette 10 is not hooked on the thread hook 123a and an operating position where thread can be hooked (see FIGS. 25 and 29). A hook member 123 interlockingly connected to the moving arm 122 and an operating force adding member 124 for applying an operating force to the hook member 123 for switching the hook member 123 between the standby position and the operating position (FIG. 28, FIG. And irradiation), and an operation force transmission mechanism 125 for transmitting the operating force acting on the operating force applying member 124 to pivot arm 122 (see FIG. 28, FIG. 29).
[0062]
The yarn hooking mechanism 18 switches the hook member 123 from the standby position to the operating position by an operating force applied to the operating force applying member 124 from the yarn cassette 10 in conjunction with the mounting operation of the yarn cassette 10, The hook member 123 and the rotating arm 122, which have been switched to the operation position, are slid together with the movable member 121 to slide the two first and second thread guides 19 and 20, and the first and second thread guides 19. , 20 and a second swing for returning and swinging the hook member 123 to the standby position.
[0063]
Here, the standby position includes a first standby position (see FIGS. 24 and 28) close to the yarn guides 19 and 20 before the yarn cassette 10 is mounted, and a first standby position when the yarn cassette 10 is mounted. Two standby positions, which are second standby positions (see FIGS. 27 and 31) farther from the yarn guides 19 and 20 than the positions, are included.
[0064]
The base member 120 is attached to a frame member 130 constituting a part of the thread tension mechanism 14 in a state of being suspended below by two support members 131 and 132 (see FIG. 28). A stopper member 133 that receives and stops the rotating arm 122 that moves leftward during the sliding movement is formed integrally with the base member 120 so as to project downward.
[0065]
The movable member 121 is formed of a member having a substantially rectangular shape and a horizontal plate shape in a plan view, and is attached to the base member 120 by two pin members 134 and 135 so as to be slidable in the left-right direction. The movable member 121 is formed with a guide groove 121a that engages with the two pin members 134 and 135 and guides the slide movement with respect to the base member 120 so as to extend in the left-right direction.
[0066]
That is, the movable member 121 starts from a state in which the left pin member 134 is at the left end position of the guide groove 121a (see FIG. 24) until the right pin member 135 reaches the right end of the guide groove 121a (see FIG. 27). Is slidably attached to the base member 120 by a predetermined distance. A slit 121b parallel to the guide groove 121a is formed on the rear side of the guide groove 121a. The movable member 121 elastically urges the movable member 121 rightward (the threading start end position in FIG. 24). The return coil spring 136 is mounted.
[0067]
The base end of the rotating arm 122 is pivotally connected to a front portion of the right end of the movable member 121 via a pin 137 (see FIG. 28). A torsion spring 138 (see FIG. 28) that elastically biases in the surrounding direction (the direction in which the hook member 123 becomes the standby position) is attached. An operation force input portion 122a to which an operation force for switching the hook member 123 by the operation force transmission mechanism 125 is input is formed on a right side portion of the center portion of the rotating arm 122 in the front-rear direction. A contact portion 122b that contacts the stopper member 133 when the rotating arm 122 slides to the left integrally with the movable member 121 by a predetermined distance as described later is provided on the left side of the tip of the rotating arm 122. It is formed in a horizontally projecting shape.
[0068]
The proximal end of the hook member 123 is pivotally connected to the movable member 121 via a pin 139, and the distal end of the rotating arm 122 and the vicinity of the proximal end of the hook member 123 are interlocked by an interlocking mechanism 140 described below. ing. Accordingly, the base end of the hook member 123 and the base end of the turning arm 122 are both pivotally attached to the movable member 121, and the positional relationship between the base end of the hook member 123 and the base end of the turning arm 122 is determined. It is kept constant. The interlocking mechanism 140 is provided so as to protrude downward at a notch portion 122 c formed at the distal end portion of the rotating arm 122 and at a portion behind the pin 139 near the base end portion of the hook member 123. And a pin 141 that engages with the notch 122c.
[0069]
In the state where the hook member 123 is at the first standby position shown in FIGS. 24 and 28, the thread hook 123a of the hook member 123 is separated from the upper thread 11, but from this state, it is shown in FIGS. 25 and 29. As described above, the rotating arm 122 rotates the predetermined angle θ about the pin 137 in the clockwise direction in FIG. 1 (For example, θ 1 (≒ 20 °), the notch 122c is also rotated by the angle θ 1 Only rotate. At this time, the pin 141 rotates around the pin 139 by the notch 122c.
[0070]
Here, since the distance between the pin 137, which is the center of rotation of the rotating arm 122, and the pin 141 is greater than the distance between the pins 139, 141, the rotation of the pin 141 causes the hook member 123 to swing in a horizontal state. When the pin 141 is moved, the rotation of the pin 141 is enlarged, and the thread hook 123a rotates about the pin 139 in the clockwise direction in FIG. 2 (For example, θ 2 (≒ 90 °) swings in a horizontal state, the hook member 123 reaches the operation position shown in FIGS. 25 and 29, and the thread hook 123a engages with the upper thread 11. However, the hook member 123 is located below the rotating arm 122 and the movable member 121. The hook member 123 is integrally formed with a protruding portion (not shown) projecting upward. The protrusion also rotates integrally. The movable member 121 partially protrudes on the rotation path of the protrusion, and the hook member 123 moves at a predetermined angle θ. 2 When the hook member 123 is rotated only, the protrusion of the hook member 123 and the protruding portion (not shown) of the movable member 121 are engaged, so that the hook member 123 cannot further rotate.
[0071]
As shown in FIGS. 28 to 31, the operation force applying member 124 is pivotally attached to the frame member 130 of the thread tension mechanism 14 so as to be swingable. A cassette contact portion 124a with which the lower end portion of the thread cassette 10 comes into contact is provided on the distal end side (right end side) of the operation force applying member 124 so as to protrude forward. When the yarn cassette 10 is mounted, an operation force for switching the hook member 123 between the standby position and the operation position is transmitted from the yarn cassette 10 to the cassette contact portion 124a in conjunction with the mounting operation of the yarn cassette 10. The operating force applying member 124 swings clockwise in FIG.
[0072]
The operation force transmission mechanism 125 includes a link member 145 pivotally attached to a lower end portion of the operation force addition member 124 at a middle portion in the left-right direction so as to be rotatable, and a downwardly bent shape at a distal end portion (right end portion) of the link member 145. The formed tip arm 145a, a driven pin 146 provided at the base end (left end) of the link member 145, and a cam plate 147 having an arc-shaped cam groove 147a with which the driven pin 146 is engaged. Have.
[0073]
The link member 145 extends in the left-right direction and is disposed so as to be movable in the left-right direction. An operating force is applied to the cassette contact portion 124a from the thread cassette 10, and the operating force adding member 124 is moved clockwise in FIG. The link member 145 moves to the left along with the swing. Here, as described above, the movable member 121 is urged rightward by the coil spring 136, and the pivot arm 122 is pivotally attached to the movable member 121. It is in a state of being constantly in contact with the operation force input unit 122a of the control unit 122.
[0074]
That is, the operating force is transmitted to the operating force input portion 122 a of the rotating arm 122 via the link member 145 extending in the left-right direction, but the base end of the link member 145 is connected to the cam groove of the cam plate 147 via the driven pin 146. When the lower end of the operating force applying member 124 moves in an arc shape, the driven pin 146 moves along the arc of the cam groove 147a substantially coinciding with the arc, and the entire link member 145 is guided. It can move smoothly in the left and right direction. That is, the link member 145 does not rotate with a rotation center at a part of the link member 145. Accordingly, the distal arm 145a presses the operating force input unit 122a of the rotating arm 122 substantially horizontally to the left, and the occurrence of sliding friction between the distal arm 145a and the operating force input unit 122a is reduced. It can be suppressed as much as possible.
[0075]
Next, the thread hooking operation by the thread hooking mechanism 18 will be described. In the state before the thread cassette 10 is mounted, as shown in FIGS. 24 and 28, the hook member 123 is at the first standby position where the upper thread 11 is not hooked on the thread hook 123a. When the thread cassette 10 is pushed into the cassette mounting portion 5 from this state, the lower end of the cassette main body 20 of the thread cassette 10 abuts on the cassette contact portion 124a, and an operating force is applied from the thread cassette 10 to the cassette contact portion 124a. As a result, the cassette contact portion 124a swings clockwise in FIG.
[0076]
At this time, when the operating force is transmitted from the operating force applying member 124 to the operating force input portion 122a of the rotating arm 122 via the distal arm portion 145a of the link member 145 by the operating force transmitting mechanism 125, the rotating arm 122 At a predetermined angle θ 1 A first swing is performed to rotate the hook member 123 from the standby position to the operation position while rotating the hook member 123 only by the rotation.
[0077]
That is, by the operating force input from the distal arm 145a to the operating force input unit 122a, the rotating arm 122 rotates the pin 137 as the center of rotation in the clockwise direction of FIG. 1 The rotation of the hook member 123, which is driven only by rotation and is linked to the rotation arm 122, is also performed by the linkage mechanism 140 between the first thread guide 19 and the second thread guide 20 with the pin 139 as the rotation center in FIG. As shown in FIG. 25, the thread hook 123a swings 2 The threading hook 123a engages with the upper thread 11 by being rotated only by the rotation. Here, in order to ensure that the upper thread 11 is hooked on the thread hook 123a, the operating position of the hook member 123 shown in FIG. 25 is located to the right (the thread hooking portions 19a, 20a) of the first standby position shown in FIG. (In the direction of the opening). With the rotation of the rotation arm 122, the contact portion 122b formed at the tip of the rotation arm 122 projects leftward.
[0078]
When the operation force is further transmitted to the rotating arm 122 after the first swing, the rotating arm 122 is engaged with the projecting portion of the movable member 121 and the projecting portion of the hook member 123 so that the rotating arm 122 has a predetermined angle θ. 1 As shown in FIGS. 26 and 30, the hook member 123 and the rotating arm 122, which have been switched to the operating positions, together with the movable member 121 resist the urging force of the coil spring 136. Thus, the slider 122 slides leftward by a predetermined distance until the contact portion 122b contacts the stopper member 133. At the time of this sliding movement, the upper thread 11 engaged with the thread hook 123a is pulled to the left together with the hook member 123, and the first thread guide 19 and the second thread guide 20 are respectively threaded to the thread hook portions 19a, 20a. The upper thread 11 is hung.
[0079]
Here, as shown in FIGS. 24 to 27, the thread hooks 19a and 20a of the two thread guides 19 and 20 respectively open substantially rightward, and a hook member 123 is provided between the two thread guides 19 and 20. Moves between the standby position and the operating position. Therefore, this sliding movement ensures that the upper thread 11 engaged with the thread hook 123a is hooked on the two thread guides 19 and 20. Further, at this time, the upper thread 11 engaged with the thread hook 123a is moved from the open end (right end) of the thread hooks 19a, 20a of the thread guides 19, 20 to the far end (left end) side, and the upper thread 11 11 is securely hung on the innermost ends of the thread guides 19 and 20.
[0080]
As shown in FIGS. 26 and 30, a state in which the contact portion 122b contacts the stopper member 133 and the pin 141 cannot move to the left (a part of the rotating arm 122 with respect to the movable member 121). When the yarn cassette 10 is further pushed in and the operation force is input to the operation force input portion 122a in a state where the hook member 123 is temporarily stopped, the second swing for returning and swinging the hook member 123 to the second standby position is performed. Done. That is, the movable member 121 moves leftward with respect to the base member 120 until the right pin member 135 engages with the right end of the guide groove 121a, so that the movable member 121 rotates as shown in FIGS. The arm 122 rotates in the counterclockwise direction in FIG. 27 around the pin 141, and the hook member 123 is also swung in the counterclockwise direction in FIG. Hook member 123 is switched to the second standby position.
[0081]
The contact portion 122b slides with respect to the stopper member 133 with the rotation of the rotation arm 122. At this time, the engagement of the upper thread 11 with the thread hook 123a is released, the upper thread 11 is released from the thread hook 123a, and the thread hook operation on the thread guides 19 and 20 is completed. Note that when the hook member 123 is switched to the second standby position, the thread hook 123a is farther from the needle bar 12 and the upper thread 11 than when the hook member 123 is switched to the first standby position. ing.
[0082]
Next, a series of operations of the sewing machine M when the thread cassette 10 is mounted will be described focusing on the threading operation by the threading mechanism 16, the thread holding operation by the thread holding mechanism 17, and the thread hooking operation by the thread hooking mechanism 18. I do. When the thread cassette 10 is inserted into the upper part of the cassette mounting part 5 from above and pushed in, the lower end of the cassette body 30 pushes the cassette contact body 90 downward in the thread holding mechanism 17 as shown in FIGS. Therefore, the holding member 70 is moved downward by the interlocking movement mechanism 73 in conjunction with the mounting operation of the thread cassette 10. At this time, as shown in FIG. 16, when the driven pin 84 provided on the thread holding member 74 reaches the pin passage 112 inside the cam member 42 of the thread cassette 10, the driven pin 84 moves along the cam surface 111a. Since the driven pin 84 moves downward, the driven pin 84 is operated by the cam member 42, and the thread pinching member 74 starts swinging about the pivot shaft 82 toward the pinching release side against the urging force of the torsion spring 75. .
[0083]
Further, when the holding member 70 moves downward and the driven pin 84 comes into contact with the most rearwardly protruding portion of the cam surface 111a as shown in FIG. At this time, the thread portion 11c (see FIGS. 4 and 7) of the upper thread 11 stretched on the front side of the thread cassette 10 enters between the left thread holding portion 71 and the thread holding member 74. become.
[0084]
Thereafter, as the driven pin 84 relatively moves downward along the cam surface 111a, the thread holding member 74 is oscillated to the yarn holding side by the torsion spring 75, and the driven pin 84 comes out of the pin passage 112 and the cam surface 111a. 18, the upper thread 11 is clamped between the thread holding portion 71 and the thread clamping member 74, as shown in FIG. In this state, the movable frame 77 and the holding member 70 are further moved downward in accordance with the mounting operation of the thread cassette 10, and the upper thread 11 is turned by the pair of left and right thread holding portions 71 and 72 of the holding member 70 into the eye holes of the sewing needle 15. It is held near 15a.
[0085]
At this time, the threading operation by the threading mechanism 16 is also performed at the same time. That is, as shown in FIG. 8, when the threading shaft 50, the slider guide shaft 51, and the threading slider 52 move downward in synchronization with the mounting operation of the thread cassette 10, the threading shaft 50 moves downward by a predetermined distance. The downward movement of the threading shaft 50 is locked by the pin member 56b and the regulating member 12c, but the threading slider 52 moves further downward against the urging force of the coil spring 58. That is, the threading slider 52 moves downward relative to the threading shaft 50, and the relative movement is converted into rotation of the threading shaft 50 by the pin member 56a and the cam groove 52a of the threading slider 52, and The through shaft 50 rotates by a predetermined angle.
[0086]
At this time, the hook mechanism 53 provided at the lower end of the threading shaft 50 also rotates integrally with the threading shaft 50, as shown in FIG. Pass through the eye hole 15a. At this time, the holding member 70 of the thread holding mechanism 17 starts to rise from the lowermost position, and the upper thread 11 held by the thread holding portions 71 and 72 of the holding member 70 is hooked on the hook portion 60a.
[0087]
At this time, the cam portion 54b of the threading shaft driving member 54 comes into contact with the distal end cam portion 69a of the cam member 69, and the threading shaft driving member 54 counterclockwise rotates in FIG. Driven in the direction of Therefore, since the driving force for driving the threading shaft 50 downward is not transmitted to the threading slider 52, the threading shaft 50 rotates in the opposite direction and returns upward due to the urging force of the coil spring 58. Since the hook mechanism 53 also rotates integrally with the threading shaft 50, as shown in FIG. 21, the hook member 123 hooked on the upper thread 11 comes off from the eye 15a, and the threading operation is completed.
[0088]
When the upper thread 11 held by the thread holding mechanism 17 is passed through the eye 15a by the threading mechanism 16 and the thread cassette 10 is further pushed into the cassette mounting section 5, the thread hooking mechanism 18 Thus, the upper thread 11 is hooked on the two thread guides 19 and 20. That is, as shown in FIGS. 24 and 28, the thread cassette 10 is pushed into the cassette mounting portion 5 from the state where the hook member 123 is at the first standby position where the upper thread 11 is not hooked on the thread hook 123a. Then, the lower end portion of the cassette main body 30 comes into contact with the cassette contact portion 124a of the operation force applying member 124, and the operation force acts on the cassette contact portion 124a from the thread cassette 10.
[0089]
When the operating force applied to the operating force applying member 124 is transmitted to the operating force input unit 122a of the rotating arm 122 by the operating force transmitting mechanism 125, first, via the interlocking mechanism 140, as shown in FIGS. As shown in the drawing, a first swing for switching the hook member 123 from the first standby position to the operation position is performed, and the upper thread 11 is engaged with the thread hook 123a. Next, as shown in FIGS. 26 and 30, sliding movement is performed to slide the hook member 123 and the rotating arm 122, which have been switched to the operation positions, together with the movable member 121, and the two thread guides 19 and 20 are threaded. The upper thread 11 is hung on the portions 19a and 20a. Further, as shown in FIGS. 27 and 31, after hooking the thread on the thread guides 19 and 20, a second swing for returning and swinging the hook member 123 to the second standby position is performed. The thread 11 comes off and the thread hooking operation is completed.
[0090]
According to the sewing machine M described above, the following effects can be obtained.
[0091]
1) The yarn hooking mechanism 18 switches the hook member 123 between the standby position and the operation position by the operation force applied to the operation force applying member 124 from the yarn cassette 10 in conjunction with the mounting operation of the yarn cassette 10. Since the upper thread 11 is configured to be threaded on the first thread guide 19, the thread can be automatically threaded on the first thread guide 19 in conjunction with the mounting operation of the thread cassette 10. After threading the eye 15a by the threading mechanism 16, the needle bar 12 is at a predetermined position close to the uppermost position. However, it is difficult for the operator to thread the first thread guide 19 himself during the threading operation or taking out and the cloth. However, as described above, the first thread guide Since the upper thread 11 can be hung on the 19, such a difficult operation can be omitted, and the operation efficiency can be improved. Further, when the upper thread 11 is hooked on the first thread guide 19 by the thread hooking mechanism 18, the upper thread 11 can be hooked on the second thread guide 20 at the same time, and the upper thread 11 is hooked on the second thread guide 20. You can save time and effort.
[0092]
2) Since the base end of the link member 145 is guided to the cam groove 147a of the cam plate 147 via the driven pin 146, the operating force applied to the operating force adding member 124 in conjunction with the mounting operation of the thread cassette 10. Is transmitted to the operating force input portion 122a of the rotating arm 122 via the link member 145, the link member 145 can move horizontally and smoothly in the left-right direction. Therefore, the distal arm 145a can press the operating force input section 122a of the rotating arm 122 substantially horizontally to the right, and the occurrence of sliding friction between the distal arm 145a and the operating force input section 122a can be reduced. It can be suppressed as much as possible. That is, the force for mounting the yarn cassette 10 is small.
[0093]
3) The thread hooks 19a, 20a of the first thread guide 19 and the second thread guide 20 open in substantially the same direction (to the right), and the operation position of the hook member 123 is greater than that of the standby position. Since the hook member 123 is located in the opening direction (rightward) of 20a and moves between the standby position and the operation position between the first yarn guide 19 and the second yarn guide 20, When the hook member 123 is at the standby position, the upper thread 11 does not catch on the thread hook 123a, and when the hook member 123 is switched to the operation position, the upper thread 11 is positioned in the opening direction of the thread hook portions 19a and 20a. The upper thread 11 can be hooked on the thread hook 123a.
[0094]
Further, since the hook member 123 moves between the standby position and the operation position between the first yarn guide 19 and the second yarn guide 20, the upper yarn 11 is hung on the yarn hook 123a. By moving the hook member 123 to the side opposite to the opening direction of the thread hooks 19a, 20a, the upper thread 11 enters the innermost ends of the thread hooks 19a, 20a, so that the upper thread 11 is securely moved to the first and the second ends. The two yarn guides 19 and 20 can be hung.
[0095]
4) When an operation force is transmitted to the operation force input portion 122a of the rotating arm 122 via the operation force transmission mechanism 125, the upper thread 11 is engaged with the thread hook 123a by the first swing. The upper thread 11 engaged with the thread hook 123a by the sliding movement is drawn toward the thread guides 19 and 20, and the upper thread 11 is hooked on the thread guides 19 and 20, and finally the thread hook 123a and the upper thread by the second swing. The engagement with 11 is released. That is, the upper thread 11 can be automatically and reliably hooked on the thread guides 19 and 20 by such three-stage operation of the hook member 123. Further, during the sliding movement (second movement), the upper thread 11 engaged with the thread hook 123a is moved from the open ends of the thread hooks 19a and 20a of the thread guides 19 and 20 to the far end. Therefore, the upper thread 11 is reliably hung on the inner ends of the thread guides 19 and 20.
[0096]
5) When the yarn cassette 10 is not mounted on the cassette mounting portion 5, the hook member 123 is at the first standby position near the first and second yarn guides 19 and 20, so that the yarn cassette 10 is mounted. Then, since the hook member 123 is switched from the first standby position to the operation position, the operation of hooking the yarn guides 19 and 20 can be started immediately. On the other hand, after the completion of the installation of the thread cassette 10, the hook member 123 is at the second standby position farther from the thread guides 19 and 20 than the first standby position, and the hook member 123 is separated from the needle bar 12. In addition, it is possible to prevent the upper thread 11 from getting entangled with the hook member 123 during the sewing operation.
[0097]
6) The sewing machine M is configured such that the cassette mounting portion 5 is provided on the head 4 and the thread cassette 10 is inserted into the cassette mounting portion 5 from above the sewing machine M, and the operator pushes the thread cassette 10 with both hands. In the case of mounting, both hands of the worker are located above the head 4. That is, both hands of the worker are far away from the first and second thread guides 19 and 20 provided below the head 4. However, in the present embodiment, since the upper thread 11 is also hooked on the first and second thread guides 19 and 20 in conjunction with the attaching operation of the thread cassette 10, after the thread cassette 10 is attached, It is not necessary to move the hand to the first and second thread guides 19 and 20 below the head 4, so that the preparation work for sewing can be performed smoothly.
[0098]
Next, modified embodiments in which various modifications are made to the above-described embodiment will be described.
[0099]
1] As a yarn supply source accommodated in the yarn cassette 10, various forms such as a yarn supply source constituted by a thread spool or a bobbin and a simple yarn lump can be used. Further, a thread cassette having a configuration in which only the thread spool or the lump of thread is passed through the thread standing bar in a state of being exposed without covering the periphery of the thread spool or the lump of thread as the thread supply source may be used.
[0100]
2] In the above embodiment, the worker himself pushes the yarn cassette 10 into the cassette mounting part 5 to mount the yarn cassette 10, but the rubber roller (Japanese Patent Application No. 2002 filed by the present applicant) is used. 189517) and other driving means such as a motor are used to automatically mount the yarn cassette 10, and the yarn holding mechanism 17 and the yarn hooking mechanism 18 are driven by this driving means. May be. Further, if the yarn is hooked on the two yarn guides 19 and 20, the yarn holding mechanism 17 and the yarn hooking mechanism 18 may be driven by a manual operation lever.
[0101]
3] In the above-described embodiment, the first yarn guide 19 and the second yarn guide 20 have yarn hooking portions 19a and 20a which are respectively opened substantially rightward and are formed horizontally, and the hook member 123 is made substantially horizontal. By moving over the standby position and the operation position, the upper thread 11 is hooked on the thread hook 123a, but the hook member 123a is moved from left to right in a diagonally downward direction of 45 degrees. It may be configured as follows. Conversely, the thread hooks 19a, 20a of the first thread guide 19 and the second thread guide 20 are formed so as to open rightward and extend upward at approximately 45 degrees, respectively, so that the hook member 123 is horizontally moved. You may comprise so that it may move from left to right.
[0102]
4] The base member of the thread hooking mechanism may be provided integrally with the sewing machine frame or a cover that covers the sewing machine frame. In this case, the movable member, the stopper member, and the coil spring are provided directly on the sewing machine frame or a cover that covers the sewing machine frame.
[0103]
According to the first aspect of the present invention, the thread is automatically hooked on the thread guide in conjunction with the mounting operation of the thread cassette, so that the operator himself can guide the thread after threading the needle through the eye hole. This eliminates the need for threading the yarn, thereby improving work efficiency.
[0104]
According to the second aspect of the present invention, when the yarn is hooked on the first yarn guide, the yarn is also hooked on the second yarn guide separated from the first yarn guide by a predetermined distance, so that the yarn is hooked on the second yarn guide. The labor can be saved, and the working efficiency can be improved.
[0105]
According to the third aspect of the present invention, since the rotating arm and the hook member slide with respect to the base member together with the movable member, the thread hooked on the thread hook is drawn into the thread guide side, and is reliably inserted into the thread guide. The thread is hung. In addition, since the first thread guide is located to some extent close to the sewing machine head, it is difficult for the operator himself to thread the first thread guide at the time of preparation for sewing such as threading operation and cloth entry and exit. However, as described above, the yarn can be hooked on the first yarn guide in conjunction with the mounting operation of the yarn cassette, so that the working efficiency can be improved.
[0106]
According to the fourth aspect of the present invention, the distal arm portion presses the operating force input portion of the rotating arm substantially horizontally, and minimizes the occurrence of sliding friction between the distal arm portion and the operating force input portion. The thread hooking operation can be performed with the operation force.
[0107]
According to the fifth aspect of the present invention, in the state where the hook member is switched to the operating position by the first swing, the slide movement for hanging the yarn on the first yarn guide is performed, so that the yarn is hooked on the yarn hook. As a result, the hook member is drawn to the first yarn guide side, and the first yarn guide can be securely threaded. Further, by the second swing, the hook member is returned to the standby position and swings, and the thread can be detached from the thread hook, so that the work can be performed smoothly without the trouble of removing the thread from the thread hook.
[0108]
According to the invention of claim 6, when an operating force for operating the hook member is applied to the operating force applying member, the operating force is transmitted to the hook member and the hook member is moved between the standby position and the operating position. At this time, the yarn is hooked not only on the first yarn guide at the lower portion of the needle bar but also on the second yarn guide separated from the first yarn guide by a predetermined distance. Work can be saved, and work efficiency can be improved.
[0109]
According to the seventh aspect of the present invention, since the operation position where the yarn is hooked on the yarn hook is located closer to the opening direction of the yarn hooking portions of the first and second yarn guides than the standby position, the hook member is at the standby position. Sometimes, even if the yarn sags and the yarn is located near the opening of the yarn hooking portion, the yarn does not accidentally hook on the yarn hook, and when the hook member is switched to the operating position, Can be hung on the thread hook. Further, since the hook member moves between the standby position and the operation position between the first yarn guide and the second yarn guide, the hook member is moved in the state where the yarn is hooked on the yarn hook. By moving the yarn in the direction opposite to the opening direction, the yarn enters the inner end of the yarn hooking portion, so that the yarn can be reliably hung on the first and second yarn guides.
[0110]
According to the eighth aspect of the present invention, the sewing machine includes the thread hooking device having the same configuration as the first aspect, so that substantially the same effects as those of the first aspect can be obtained.
[0111]
According to the ninth aspect of the present invention, since the sewing machine includes the thread hooking device having the same configuration as that of the sixth aspect, substantially the same effects as those of the sixth aspect can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view of a sewing machine according to an embodiment of the present invention.
FIG. 2 is a partially cutaway front view of the sewing machine.
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is a front view of the thread cassette.
FIG. 5 is a left side view of the yarn cassette.
FIG. 6 is a right side view of the thread cassette.
FIG. 7 is a bottom view of the thread cassette.
8A and 8B are configuration diagrams of a threading mechanism. FIG. 8A is a left side view, and FIG. 8B is a front view.
FIGS. 9A and 9B are perspective views showing an operating state of the hook mechanism, wherein FIG. 9A shows a state immediately before threading, and FIG. 9B shows a state in which threading is completed.
FIG. 10 is a side view of the main part of the head after the threading operation is completed.
11A and 11B are diagrams illustrating a holding member and a movable frame, wherein FIG. 11A is a left side view, FIG. 11B is a front view, and FIG. 11C is a right side view.
FIG. 12 is a side view of a holding member and an interlocking moving mechanism.
FIGS. 13A and 13B are side views of the holding member support, wherein FIG. 13A is a left side view and FIG. 13B is a right side view.
FIG. 14 is a diagram illustrating an operation state of the holding member and the thread holding member (immediately before the movement of the holding member).
FIG. 15 is a diagram illustrating an operation state of the holding member and the thread holding member (immediately after the start of the movement of the holding member).
FIG. 16 is a diagram illustrating an operation state of the holding member and the thread holding member (at the time of starting the movement of the thread holding member).
FIG. 17 is a diagram illustrating an operation state of the holding member and the thread holding member (a state in which the thread holding member is in a maximum swinging state).
FIG. 18 is a diagram illustrating an operation state of the holding member and the thread holding member (at the end of the swing of the thread holding member).
FIG. 19 is a diagram illustrating an operation state (a state in which the upper thread is clamped) of the holding member and the thread clamping member.
FIG. 20 is a partial plan view of a hook mechanism and a holding member during a threading operation.
FIG. 21 is a side view of FIG. 20 at the time of a threading operation.
FIG. 22 is a side view of the main part of the head immediately after the threading operation.
FIG. 23 is a diagram illustrating an operation state (after a threading operation) of the holding member and the thread holding member.
FIG. 24 is a bottom view of the thread hooking mechanism (immediately before the thread hooking operation).
FIG. 25 is a bottom view of the thread hooking mechanism (after the first swing).
FIG. 26 is a bottom view of the thread hooking mechanism (after sliding movement).
FIG. 27 is a bottom view of the thread hooking mechanism (after the second swing).
FIG. 28 is a front view of FIG. 24.
FIG. 29 is a front view of FIG. 25.
FIG. 30 is a front view of FIG. 26;
FIG. 31 is a front view of FIG. 27.
[Explanation of symbols]
M sewing machine
4 head
5 Cassette mounting section
10 yarn cassette
11 Upper thread
15 sewing needle
18 Threading mechanism
19 First thread guide
19a Threading part
20 Second thread guide
20a thread hook
121 movable member
122 Rotating arm
122a Operating force input unit
123 hook member
123a thread hook
124 Operating force adding member
125 Operating force transmission mechanism
145 link member
145a Tip arm
146 Follower pin
147 cam plate
147a Cam groove

Claims (9)

糸供給源を収容し且つミシンのカセット装着部に着脱可能に装着される糸カセットと、縫針を支持する針棒の下部の第１糸案内とを備えたミシンの糸案内への糸掛け装置であって、
糸掛けフックを有し、この糸掛けフックに前記糸カセットから導出された糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、
このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、
前記糸カセットの装着動作に連動して前記糸カセットから前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内へ前記糸を掛けるように構成したことを特徴とする糸案内への糸掛け装置。A thread hooking device for a thread guide of a sewing machine, comprising a thread cassette accommodating a thread supply source and removably mounted on a cassette mounting portion of the sewing machine, and a first thread guide below a needle bar for supporting a sewing needle. So,
A hook member having a thread hook, and being movable between a standby position where the thread led from the thread cassette is not hooked on the thread hook and an operation position where the thread can be hooked;
An operating force applying member for applying an operating force for switching the hook member between the standby position and the operating position,
The hook member is switched between a standby position and an operation position by an operating force applied to the operating force applying member from the yarn cassette in conjunction with the mounting operation of the yarn cassette, and the yarn is transferred to the first yarn guide. A yarn hooking device for a yarn guide, which is configured to be hooked. 前記第１糸案内へ前記糸を掛ける際に、前記第１糸案内から所定距離離れた第２糸案内にも前記糸を掛けるように構成したことを特徴とする請求項１に記載の糸案内への糸掛け装置。2. The yarn guide according to claim 1, wherein when the yarn is hooked on the first yarn guide, the yarn is also hooked on a second yarn guide separated by a predetermined distance from the first yarn guide. 3. Threading device. 前記第１糸案内は、ミシン頭部の下方に位置し、
前記ミシン頭部の下部に固定されたベース部材と、このベース部材にスライド可能に付設された可動部材と、この可動部材に枢着され且つ前記フック部材と連動連結され、前記操作力が入力される操作力入力部を有する回動アームと、前記操作力付加部材に作用した操作力を前記回動アームの操作力入力部に伝達する操作力伝達機構とを備えたことを特徴とする請求項１又は２に記載の糸案内への糸掛け装置。The first thread guide is located below the sewing machine head,
A base member fixed to a lower portion of the sewing machine head, a movable member slidably attached to the base member, and a movable member pivotally attached to the movable member and interlockingly connected to the hook member; A rotating arm having an operating force input section, and an operating force transmitting mechanism for transmitting an operating force applied to the operating force adding member to an operating force input section of the rotating arm. 3. The yarn hooking device for yarn guides according to 1 or 2. 前記操作力伝達機構は、前記操作力付加部材に途中部が回動可能に枢着されたリンク部材と、このリンク部材の先端部に下方へ屈曲状に形成された先端アーム部と、前記リンク部材の基端部に設けられた従動ピンと、この従動ピンが係合する円弧状のカム溝を有するカム板とを備えたことを特徴とする請求項３に記載の糸案内への糸掛け装置。The operating force transmitting mechanism includes a link member pivotally connected to the operating force applying member at an intermediate portion so as to be rotatable, a distal arm portion formed to be bent downward at a distal end of the link member, and the link 4. A thread guide device according to claim 3, further comprising a driven pin provided at a base end of the member, and a cam plate having an arcuate cam groove with which the driven pin is engaged. . 前記糸カセットの装着時に、前記先端アーム部の下端部を回動アームの前記操作力入力部に当接させた状態で、前記先端アーム部により前記回動アームをほぼ水平な方向に駆動して、前記フック部材を待機位置から作用位置に切換える第１揺動と、作用位置に切換えた前記フック部材と前記回動アームを前記可動部材と共にスライド移動させて前記第１糸案内へ前記糸を掛けるスライド移動と、その糸掛け後に前記フック部材を待機位置へ復帰揺動させる第２揺動とを行うように構成したことを特徴とする請求項４に記載の糸案内への糸掛け装置。When the thread cassette is mounted, the lower arm of the distal arm is brought into contact with the operating force input section of the rotary arm, and the rotary arm is driven in a substantially horizontal direction by the distal arm. A first swing for switching the hook member from the standby position to the operating position, and a sliding movement of the hook member and the rotating arm switched to the operating position together with the movable member to hook the yarn on the first yarn guide. 5. The yarn hooking device according to claim 4, wherein a sliding movement and a second swing for returning and swinging the hook member to a standby position after the yarn hooking are performed. 縫針を支持する針棒の下部の第１糸案内と、前記第１糸案内から所定距離離れた第２糸案内とを備えたミシンの糸案内への糸掛け装置であって、
糸掛けフックを有し、この糸掛けフックに糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、
このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、
前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内及び前記第２糸案内に前記糸を掛けるように構成したことを特徴とする糸案内への糸掛け装置。A thread hooking device for a thread guide of a sewing machine, comprising: a first thread guide at a lower portion of a needle bar that supports a sewing needle; and a second thread guide separated from the first thread guide by a predetermined distance,
A hook member having a thread hook, and being movable between a standby position where no thread is hooked on the thread hook and an action position where thread can be hooked;
An operating force applying member for applying an operating force for switching the hook member between the standby position and the operating position,
The hook member is switched over between a standby position and an operation position by an operating force applied to the operating force applying member so that the yarn is hooked on the first yarn guide and the second yarn guide. Threading device for thread guide. 前記第１糸案内と前記第２糸案内は、前記糸を掛ける為の糸掛け部であって、略同方向へ開口する糸掛け部を夫々有し、
前記フック部材の作用位置は待機位置よりも前記糸掛け部の開口方向に位置し、
前記第１糸案内と前記第２糸案内との間で、前記フック部材が待機位置と作用位置との間を移動することを特徴とする請求項６に記載の糸案内への糸掛け装置。The first yarn guide and the second yarn guide are yarn hooking portions for hanging the yarn, each having a yarn hooking portion that opens in substantially the same direction,
The operation position of the hook member is located closer to the opening direction of the thread hook portion than the standby position,
The yarn hooking device according to claim 6, wherein the hook member moves between a standby position and an operation position between the first yarn guide and the second yarn guide. 糸供給源を収容し且つミシンのカセット装着部に着脱可能に装着される糸カセットと、縫針を支持する針棒の下部の第１糸案内とを備えたミシンにおいて、
前記第１糸案内へ糸を掛ける糸掛け装置を有し、
前記糸掛け装置は、糸掛けフックを有し、この糸掛けフックに前記糸カセットから導出された糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、
このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、
前記糸カセットの装着動作に連動して前記糸カセットから前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内へ前記糸を掛けるように前記糸掛け装置を構成したことを特徴とするミシン。In a sewing machine having a thread cassette accommodating a thread supply source and detachably attached to a cassette attachment portion of the sewing machine, and a first thread guide below a needle bar for supporting a sewing needle,
A yarn hooking device for hanging a yarn on the first yarn guide;
The yarn hooking device has a yarn hook, and a hook member movable between a standby position where the yarn led out from the yarn cassette is not hung on the yarn hook and an operation position where the yarn can be hooked,
An operating force applying member for applying an operating force for switching the hook member between the standby position and the operating position,
The hook member is switched between a standby position and an operation position by an operating force applied to the operating force applying member from the yarn cassette in conjunction with the mounting operation of the yarn cassette, and the yarn is transferred to the first yarn guide. A sewing machine, wherein the thread hooking device is configured to be hooked. 縫針を支持する針棒の下部の第１糸案内と、前記第１糸案内から所定距離離れた第２糸案内とを備えたミシンにおいて、
前記第１糸案内と前記第２糸案内へ糸を掛ける為の糸掛け装置を有し、
前記糸掛け装置は、糸掛けフックを有し、この糸掛けフックに糸を掛けない待機位置と糸掛け可能な作用位置との間を移動可能なフック部材と、
このフック部材を待機位置と作用位置とに亙って切換える為の操作力を付加する操作力付加部材とを備え、
前記操作力付加部材に作用する操作力により前記フック部材を待機位置と作用位置とに亙って切換えて前記第１糸案内及び前記第２糸案内に前記糸を掛けるように糸掛け装置を構成したことを特徴とするミシン。In a sewing machine provided with a first thread guide below a needle bar that supports a sewing needle, and a second thread guide that is separated from the first thread guide by a predetermined distance,
A yarn hooking device for hanging a yarn on the first yarn guide and the second yarn guide,
The yarn hooking device has a hook hook, and a hook member movable between a standby position where no thread is hooked on the hook hook and an operation position where thread hooking is possible,
An operating force applying member for applying an operating force for switching the hook member between the standby position and the operating position,
A yarn hooking device is configured to switch the hook member between a standby position and an operation position by an operating force applied to the operating force applying member and to hook the yarn on the first yarn guide and the second yarn guide. A sewing machine characterized by the following.
JP2002225246A 2002-08-01 2002-08-01 Yarn hooking device for yarn guide and sewing machine equipped with this yarn hooking device Expired - Fee Related JP3797292B2 (en)

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JP2002225246A JP3797292B2 (en) 2002-08-01 2002-08-01 Yarn hooking device for yarn guide and sewing machine equipped with this yarn hooking device
CN031525164A CN1480577B (en) 2002-08-01 2003-08-01 Bobbin for thread resistance sheet and sewing machine with such bobbin
US10/631,717 US6957617B2 (en) 2002-08-01 2003-08-01 Thread guide threading apparatus and sewing machine provided therewith

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7082885B2 (en) 2004-06-30 2006-08-01 Brother Kogyo Kabushiki Kaisha Sewing machine with automatic threading mechanism
CN113089201A (en) * 2019-12-23 2021-07-09 上海微创医疗器械（集团）有限公司 Thread guide device and suture apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7082885B2 (en) 2004-06-30 2006-08-01 Brother Kogyo Kabushiki Kaisha Sewing machine with automatic threading mechanism
CN113089201A (en) * 2019-12-23 2021-07-09 上海微创医疗器械（集团）有限公司 Thread guide device and suture apparatus

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