JP2004236673A - Sewing machine and needle bar thread guide of the sewing machine - Google Patents

Sewing machine and needle bar thread guide of the sewing machine Download PDF

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JP2004236673A
JP2004236673A JP2003010979A JP2003010979A JP2004236673A JP 2004236673 A JP2004236673 A JP 2004236673A JP 2003010979 A JP2003010979 A JP 2003010979A JP 2003010979 A JP2003010979 A JP 2003010979A JP 2004236673 A JP2004236673 A JP 2004236673A
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Prior art keywords
thread
guide
needle bar
sewing machine
needle
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JP2003010979A
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Japanese (ja)
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Kaoru Sakakibara
薫 榊原
Masayuki Hori
正幸 堀
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Brother Industries Ltd
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Brother Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To easily hook a thread to a needle bar thread guide and to make a needle thread hooked to the needle bar thread guide hardly detachable. <P>SOLUTION: A first needle bar thread guide 50 is provided with a first thread guide part 54 for guiding the needle thread 11f in a direction of crossing with the moving direction of the needle thread 11f to be hooked and a first thread hooking part 55 in the shape of being opened to the outside capable of introducing and hooking the needle thread 11f guided by the first thread guide part 54. A second needle bar thread guide 51 is provided with a second thread guide part 58 for guiding the needle thread 11f in the direction of crossing with the moving direction of the needle thread 11f to be hooked and a second thread hooking part in the shape of being opened to the outside capable of introducing and hooking the needle thread 11f guided by the second thread guide part 58. The first and second thread guide parts 54 and 58 are constituted so as to cross with each other in a plane view, and when the needle thread 11f is moved in a prescribed moving direction, the needle thread 11f is guided by the first and second thread guide parts 54 and 58 and hooked to the first thread hooking part 55 and the second thread hooking part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】本発明は、ミシン及びこのミシンの針棒糸案内に関し、特に、針棒糸案内に容易に糸掛け可能で且つ針棒糸案内に掛けられた上糸が抜けにくくなるように構成したものに関する。
【０００２】
【従来の技術】従来より、ミシンの針棒の下端部には、天秤に掛けられた上糸を針棒に沿って縫針の目孔まで案内する為の針棒糸案内が設けられていることが多く、縫製前にこの針棒糸案内に上糸を掛けておくことにより、針棒が縫製中に上下動する際に、上糸が針棒の下端部付近で無用に振れるのを防止することができる。
【０００３】
このような針棒糸案内には、種々のものが既に提案されているが、例えば、特許文献１に記載のミシンにおいては、一方向へ開放状に形成された第１の糸掛け部とこの第１の糸掛け部の下側において切れ目の無いリング状に形成された第２の糸掛け部とが針棒の下端部に設けられており、縫針の目孔に上糸を通す前に、第１の糸掛け部に上糸を掛けてから、第２の糸掛け部に上方から上糸を通しておくことで、上糸を縫針の近傍位置に位置規制することができ、縫製中の上糸の振れを防止できる。
【０００４】
また、特許文献２に記載のミシンは、針抱きの上方に設けられ一方へ開放したスリットを有する糸案内装置と、この糸案内装置及び針抱きの下側に設けられ一方へ開放状に形成された針棒糸案内とを備えており、これら開放状のスリットと針棒糸案内の両方に容易に上糸を掛けることができるように構成されている。
【０００５】
【特許文献１】特公昭５８−３５７２０号公報（第２頁、第１−２図）
【特許文献２】特開平１１−４８９号公報（第３−５頁、図４）
【０００６】
【発明が解決しようとする課題】しかし、特許文献１に記載のミシンにおいては、第２の糸掛け部が切れ目の無いリング状に形成されているため、第２の糸掛け部への糸掛け作業は上方から糸を通すことにより行わなければならず、糸掛け作業に手間がかかる。
【０００７】
また、特許文献２に記載のミシンにおいては、針抱きの上方に設けられた糸案内装置と針棒糸案内の双方が、夫々一方へ開放状に形成されているため、例えばナイロン系のこしの強い糸を使用して縫製を行う場合など、上糸の振れが強い場合に、糸案内装置や針棒糸案内から容易に上糸が抜けてしまう虞がある。
【０００８】
本発明の目的は、針棒糸案内に容易に糸掛け可能で且つ針棒糸案内に掛けられた上糸が抜けにくくすることである。
【０００９】
【課題を解決するための手段】請求項１のミシンは、ミシン頭部に上下動自在に配設された針棒に付設され縫針の目孔へ向かう上糸を案内する針棒糸案内を備えたミシンにおいて、前記針棒糸案内は、前記針棒の下端部に設けられた第１の針棒糸案内と、この第１の針棒糸案内の下側に所定間隔空けて前記針棒の下端部に設けられた第２の針棒糸案内とを備え、前記第１の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第１糸案内部と、この第１糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第１糸掛け部とを備え、前記第２の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第２糸案内部と、この第２糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第２糸掛け部とを備え、前記第１，第２糸案内部が平面視で互いに交差するように構成されたものである。
【００１０】
このミシンによる縫製作業前には、針棒の下端部に設けられた針棒糸案内の第１、第２の針棒糸案内に上糸が掛けられる。即ち、まず、第１の針棒糸案内において、第１糸案内部により上糸の移動方向と交差する方向へ上糸が案内されて、外部へ開放状の第１糸掛け部に上糸が導入されて上糸が第１糸掛け部に掛けられる。一方、第２の針棒糸案内においても、第２糸案内部により上糸の移動方向と交差する方向へ上糸が案内されて、外部へ開放状の第２糸掛け部に上糸が導入されて上糸が第２糸掛け部に掛けられる。ここで、第１，第２糸案内部が平面視で互いに交差するように構成されているため、これら第１，第２糸案内部により、上糸が第１，第２糸掛け部から抜けないように規制される。
【００１１】
請求項２のミシンは、請求項１の発明において、前記第１，第２糸掛け部は、互いに反対側に開放状に形成され、前記第１，第２糸掛け部により上糸を縫針の近傍位置に位置規制するように構成したものである。従って、第１、第２糸掛け部の一方に掛けられた上糸部分が、他方の糸掛け部により前記一方の糸掛け部から抜けないように規制されるため、上糸が第１，第２糸掛け部に掛けられた状態が保持されて、上糸が縫針の近傍位置に位置規制される。
【００１２】
請求項３のミシンは、請求項１又は２の発明において、前記上糸を所定の移動方向に移動させて前記第１、第２糸掛け部に糸掛けする糸掛け機構を設け、前記第１糸案内部は、曲線状又は直線状に形成されたものである。従って、糸掛け機構により上糸が所定の移動方向に直線的に移動すると、曲線状又は直線状に形成された第１糸案内部により上糸が第１糸掛け部まで案内される。
【００１３】
請求項４のミシンは、請求項１〜３の何れかの発明において、前記第２糸案内部は、第１糸案内部よりも水平方向外側へ突出状に形成されたものである。従って、糸掛けされる上糸は、最初に第２糸案内部に接触してから、第２糸案内部により上糸が第１糸案内部にも接触するように案内されて、第１、第２糸案内部の両方により上糸が第１、第２糸掛け部まで案内されることになる。
【００１４】
請求項５のミシンは、請求項１〜４の何れかの発明において、前記ミシン頭部は、糸供給源を有する糸カセットを装着する為のカセット装着部を備え、前記第１，第２針棒糸案内は、前記糸カセットと縫針の目孔との間の上糸を案内するように構成されたものである。従って、糸カセットの糸供給源から導出された上糸は、第１，第２針棒糸案内により縫針の目孔へ向かうように案内される。
【００１５】
請求項６のミシンは、請求項１〜５の何れかの発明において、前記第１、第２針棒糸案内を金属板で一体形成したものである。従って、このように金属板で一体形成された第１、第２針棒糸案内により上糸が縫針の目孔に向かうように案内される。
【００１６】
請求項７のミシンは、請求項１〜６の何れかの発明において、上糸を所定の移動方向に移動させたときに、前記第１、第２糸案内部により上糸が案内されて前記第１，第２糸掛け部に糸掛けされるように構成したものである。従って、所定の移動方向に直線的に上糸を移動させると、第１、第２糸案内部により上糸が第１，第２糸掛け部まで案内されて、第１、第２糸掛け部に糸掛けされる。
【００１７】
請求項８のミシンは、請求項１〜７の何れかの発明において、前記第１糸案内部から下方に向かって突出する突出部を有し、その突出部が前記第１の針棒糸案内と前記第２の針棒糸案内との間に亙る上糸に接触可能に配置されているものである。従って、突出部により上糸の水平方向の移動が規制される。
【００１８】
請求項９のミシンは、請求項１〜７の何れかの発明において、前記第１の針棒糸案内と前記第２の針棒糸案内との上下方向の間において、水平方向に伸展する水平伸展部を有し、その水平伸展部が前記第１の針棒糸案内と前記第２の針棒糸案内との間に亙る上糸に接触可能に配置されているものである。従って、水平伸展部により上糸の上下方向あるいは前後方向の少なくとも一方の移動が規制される。
【００１９】
請求項１０のミシンは、前記第１糸案内部から下方に向かって突出する突出部と、前記第１の針棒糸案内と前記第２の針棒糸案内との上下方向の間において、水平方向に伸展する水平伸展部とを有し、その突出部及び水平伸展部が前記第１の針棒糸案内と前記第２の針棒糸案内との間に亙る上糸に接触可能に配置されているものである。従って、突出部及び水平伸展部により、上糸の水平方向の移動及び、上糸の上下方向あるいは前後方向の少なくとも一方の移動が規制される。
【００２０】
請求項１１のミシンは、請求項１〜１０の発明において、前記第１糸掛け部は、縫製時の上糸を案内するガイド穴と、このガイド穴よりも幅が狭くこのガイド穴をその外部と連通させる開放部とを有するものである。従って、糸掛けの際に、上糸が所定の方向に移動すると、ガイド穴の外部から上糸が開放部を通ってガイド穴内に導かれ、ガイド穴により上糸が縫針近傍の所定の位置に案内された状態となる。
【００２１】
請求項１２のミシンは、請求項１〜１１の発明において、前記第１糸掛け部は、縫製時の上糸を案内するガイド穴を有し、このガイド穴が、前記第２糸掛け部に糸掛けされる上糸の移動方向と交差する方向に伸展するように形成されたものである。従って、糸掛けの際に、上糸が所定の方向に移動してガイド穴内に導かれると、上糸は、ガイド穴内で適度な遊びを有する状態で縫針近傍の所定の位置に案内される。
【００２２】
請求項１３のミシンは、請求項１１又は１２の発明において、前記第１糸案内部が、前記ガイド穴よりも前記縫針側に位置し、前記ガイド穴は、前記縫針側の端部においてその外部に開放状に形成されているものである。従って、第１の針棒糸案内において、上糸は、第１糸案内部により上糸の移動方向と交差する方向に案内された後に、ガイド穴の縫針側の端部から縫針から離れる方向に移動して、上糸がガイド穴内に導かれる。
【００２３】
請求項１４のミシンは、請求項１１又は１２の発明において、前記ガイド穴が、前記第１糸案内部の終端部よりも前記縫針側に位置しているものである。従って、第１の針棒糸案内において、上糸は、第１糸案内部により上糸の移動方向と交差する方向に案内された後に、第１糸案内部の終端部から縫針側に移動して、上糸がガイド穴内に導かれる。
【００２４】
請求項１５のミシンは、請求項１１〜１４の発明において、前記第２糸掛け部が、前記ガイド穴よりも前記縫針側に位置しているものである。従って、上糸は、第１糸掛け部のガイド穴で案内されつつ縫針側へ傾いて、上糸が第２糸掛け部にも糸掛けされる。
【００２５】
請求項１６のミシンの針棒糸案内は、ミシン頭部に上下動自在に配設された針棒を備えたミシンの針棒糸案内において、前記針棒の下端部に上下に離隔して設けられる第１，第２の針棒糸案内であって、金属板で一体形成された第１，第２の針棒糸案内を備え、前記第１の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第１糸案内部と、この第１糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第１糸掛け部とを備え、前記第２の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第２糸案内部と、この第２糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第２糸掛け部とを備え、前記第１，第２糸案内部が平面視で互いに交差するように構成されたものである。この針棒糸案内は、請求項１のミシンの針棒糸案内と略同様の作用を奏するため、その説明を省略する。
【００２６】
【発明の実施の形態】本発明の実施の形態について説明する。本実施の形態は、糸カセットの装着動作に連動して針棒に設けられた針棒糸案内に自動的に上糸を掛ける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。
【００２７】
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。
【００２８】
図２〜図４に示すように、頭部４には、上下動自在に配設された針棒１２、上下揺動自在に配設された天秤１３、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、頭部４の下端付近に設けられた糸案内１８、針棒１２に付設され縫針１５の目孔１５ａへ向かう上糸１１を案内する針棒糸案内１９、糸案内１８及び針棒糸案内１９に自動的に糸掛けする糸掛け機構２０等が設けられている。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。
【００２９】
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、図４に示すように、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２０により糸案内１８と針棒糸案内１９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、糸通し機構１６、糸保持機構１７、糸掛け機構２０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。
【００３０】
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。
【００３１】
ここで、糸カセット１０について説明する。図５〜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。
【００３２】
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。
【００３３】
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。
【００３４】
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。
【００３５】
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４参照）。このとき、目孔１５ａを通過可能な糸通し機構１６の糸通しフック４２により、糸保持機構１７により目孔１５ａ付近に保持された上糸１１が目孔１５ａから引き抜かれ、目孔１５ａに上糸１１が通される。
【００３６】
次に、針棒糸案内１９について説明する。図２、図３、図８〜図１０に示すように、針棒糸案内１９は、針棒１２の下端部に設けられた第１針棒糸案内５０と、この第１針棒糸案内５０の下側に所定間隔空けて針棒１２の下端部に設けられた第２針棒糸案内５１とを備えており、これら第１、第２針棒糸案内５０，５１は、金属板で一体形成されている。第１、第２針棒糸案内５０，５１は、鉛直板状の連結部５２により一体的に連結され、図１０に示すように、針棒糸案内１９は、縫針１５を保持する針抱き５３（図１１〜図１８参照）を上下から挟むように、正面視で逆コの字状に形成されている。ミシンＭの前方から見て、連結部５２が針抱き５３の左側に位置するように、針棒糸案内１９は針棒１２の下端部に取り付けられている。そして、後ほど詳述する糸掛け機構２０により上糸１１を左方へ直線的に移動させるだけで、第１、第２針棒糸案内５０，５１に上糸１１が掛けられるようになっている。
【００３７】
図８〜図１０に示すように、第１針棒糸案内５０は、前方へ上糸１１を案内する第１糸案内部５４と、この第１糸案内部５４で案内された上糸１１を導入して糸掛け可能で前方開放状の第１糸掛け部５５を備えている。尚、第１糸案内部５４は、糸掛けされる上糸１１の移動方向（左方）と交差（略直交）する方向（前方）へ上糸１１を案内することになる。この第１針棒糸案内５０には、針棒糸案内１９を針棒１２に取り付ける為の鉛直板状の取付部５６が一体的に設けられている。さらに、第１針棒糸案内５０には、針棒１２の下端部に係合可能な係合穴５７も設けられている。
【００３８】
第１糸案内部５４は、水平方向に且つ前方に突出するように形成され、さらに、後述の糸掛け機構２０により右方から左方へ移動してきた上糸１１を前方へスムーズに案内できるように、第１糸案内部５４の右端部は曲線状に形成されている。第１糸掛け部５５は、第１糸案内部５４の突出部５４ａの先端から後方へ直角的に切欠いた形状に形成されている。
【００３９】
第２針棒糸案内５１は、連結部５２から右方へ水平に延びるように形成されており、この第２針棒糸案内５１は、後方へ上糸１１を案内する第２糸案内部５８と、この第２糸案内部５８で案内された上糸１１を導入して糸掛け可能で後方へ開放状の第２糸掛け部５９を備えている。尚、第２糸案内部５８は、糸掛けされる上糸１１の移動方向（左方）と交差する方向で且つ第１糸案内部５４が案内する方向と逆方向（後方）へ上糸１１を案内することになる。ここで、図８に示すように、第１糸案内部５４と第２糸案内部５８は、平面視で左右に交差している。また、第１糸掛け部５５は前方へ開放状（前方が開け、環のようには閉じておらず、前方向きの端部）に形成されているのに対し、第２糸掛け部５９は逆に後方へ開放状（後方が開け、環のようには閉じておらず、後ろ向きの端部）に形成されている。
【００４０】
即ち、図９に示すように、第２糸掛け部５９は、連結部５２の右側においてその連結部５２に連続して形成された辺端部５９ａと、その辺端部５９ａの右側において辺端部５９ａに連続して形成された辺端部５９ｂとから構成されている。その辺端部５９ａは左右方向よりも右前方に向かって伸展し、辺端部５９ｂは左右方向よりも右後方に向かって伸展する。これら辺端部５９ａ，５９ｂは鈍角（角度Ｐが９０度よりも大きく、１８０度より小さい）を成して連結し、針抱き５３のすぐ下方の縫針１５よりも前方に位置する。これら辺端部５９ａ，５９ｂの連結部分（滑らかに形成された屈曲部）は、第１糸掛け部５５の前後方向に伸展する部分よりも、左方、且つ、後方にあり、且つ針抱き５３の前面よりも前方にある。
【００４１】
この辺端部５９ｂは、前記第２糸案内部５８の左側においてその第２糸案内部５８に連続して形成されており、辺端部５９ｂと第２糸案内部５８とは鈍角（角度Ｑが１８０度よりも大きく、２７０度よりも小さい）を成して連結する。尚、前記辺端部５９ａ，５９ｂ、第２糸案内部５８は、第２針棒糸案内５１の後端部にあたる。
【００４２】
前記第２糸案内部５８は縫針１５よりも前方に位置し、第２糸案内部５８の右端部は、前記第１糸案内部５４の右端部よりも右前方に突出する。辺端部５９ｂと第２糸案内部５８との連結部分（滑らかに形成された頂点部）は、前記辺端部５９ａ，５９ｂの連結部分よりも後方にあり、且つ、第１糸掛け部５５の前後に伸展する部分よりも右方にある。さらに、辺端部５９ｂと第２糸案内部５８との連結部分は、前記第１糸案内部５４の糸部分１１ｇに当接する領域（案内する端部：図９の２点鎖線で示す３つ並んだ糸部分１１ｇのうち、左から２つ目の真ん中の糸部分１１ｇが示す第１糸案内部５４の部分）よりも後側にあり、且つ、針抱き５３の前面よりも後方にある。
【００４３】
図８、図９に示すように、第２糸案内部５８は、第２針棒糸案内５１の右半部において、右斜め前方且つ水平方向に突出するように形成され、左方ほど後方へ傾斜するように形成された第２糸案内部５８の後端部により、右方から左方へ移動してきた上糸１１が後方へ案内される。第２糸掛け部５９は、第２針棒糸案内５１の左半部の後端部においてやや窪んだ形状に形成され、第２糸案内部５８により後方へ案内されてきた上糸１１が第２糸掛け部５９に掛けられる。
【００４４】
ところで、図８、図９に示すように、第２糸案内部５８は、第１糸案内部５４よりも水平方向で且つ右斜め前方へ突出している。従って、糸掛け機構２０により上糸１１が右方から左方へ移動すると、まず、上糸１１は、右方へ突出した第２糸案内部５８の後端部に接触して、上糸１１は第２糸案内部５８により確実に後方へ案内される。さらに、上糸１１が左方へ移動すると、上糸１１は曲線状に形成された第１糸案内部５４にも接触する。
【００４５】
そして、図８に示すように、第１糸案内部５４に接触した糸部分１１ｆは、第１糸案内部５４により前方へ案内されて、糸部分１１ｆが突出部５４ａを越えて第１糸掛け部５５に上糸１１が掛けられる。一方、図９に示すように、第２糸案内部５８に接触した糸部分１１ｇは、第２糸案内部５８により後方へ案内されて第２糸掛け部５９にも上糸１１が掛けられる。尚、当然のことであるが、上糸１１ｆが第１糸案内部５４の突出部５４ａを越えて第１糸掛け部５５に糸掛けされるためには、突出部５４ａの左右方向の位置が、上糸１１の左方への移動限界位置（上糸１１に係合して左方へ移動する後述の糸掛けフック６３ａの移動限界位置）よりも右側に位置することが必要になる。
【００４６】
ここで、第１、第２糸案内部５４，５８は平面視で左右に交差しているので、第１、第２糸案内部５４，５８により、第１、第２糸掛け部５５，５９に掛けられた上糸１１が抜けにくくなっている。さらに、第１、第２糸掛け部５４，５９は、互いに反対側に開放状に形成されているため、第１糸掛け部５５に糸掛けされた糸部分１１ｆは、第１糸掛け部５５から抜けないように第２糸掛け部５９で位置規制され、逆に、第２糸掛け部５９に糸掛けされた糸部分１１ｇは、第２糸掛け部５９から抜けないように第１糸掛け部５５で位置規制される。従って、上糸１１が第１、第２糸掛け部５４，５９に糸掛けされた状態では、上糸１１は、縫針１５の近傍位置に位置規制されて縫針１５に沿った状態に保持される（図１８参照）。つまり、縫製中に針棒１２や縫針１５が上下動するときに、上糸１１が縫針１５から離れて無用に振れることがないように規制される。
【００４７】
尚、第１、第２針棒糸案内５０，５１は、糸カセット１０と縫針１５の目孔１５ａとの間の上糸１１を針棒１２の下端部において案内するように構成されている。従って、糸カセット装着型のミシンＭにおいては、糸カセット１０とカセット装着部５との間に形成される空間等により糸路がやや不安定になる場合も想定されるが、そのような場合においても、糸カセット１０から導出された上糸１１を第１，第２針棒糸案内５０，５１により縫針１５の目孔１５ａに向かうように確実に案内できるので、上糸１１の振れを極力防止できる。
【００４８】
また、図８、図１７、図１８に示すように、針棒１２の前側面における下部には、上下に伸張する溝１２ａが形成されており、前面において直線状の開口部が形成され、後方に向かって凹みとして形成されている。そして、この針棒１２の溝１２ａは、針棒１２の最下端から針棒糸案内１９の取付位置よりも上側の部分まで形成されている。尚、この溝１２ａは針棒１２の最下端まで形成されているため、針棒１２の最下端にも開口部が形成されていることになる。この溝１２ａの内面は平面状に形成され、溝１２ａには縫針１５の上端部が挿入される。即ち、この溝１２ａの左右方向の幅は、縫針１５の直径よりも大きい。そして、図１７、図１８に示すように、この溝１２ａの所定の位置に、縫針１５の上端が当接して縫針１５の上限位置（固定位置）を決めるためのストッパー１２ｂが設けられている。
【００４９】
また、縫針１５の上端部には、縫針１５の目孔１５ａの貫通方向が前後方向になった状態で、縫針１５が針棒１２の溝１２ａに取り付けられるようにするための、平坦面が１箇所だけ形成されている。この平坦面が針棒１２の溝１２ａの左右及び後方の３つの内面のうちの前後方向に直交する後方の内面に接するようにして、縫針１５が針棒１２ａの溝に取り付けられる。これらの構成は一般的なものであるので、詳細な説明は省略する。
【００５０】
図８に示すように、その針棒１２の溝１２ａには、新規な構成として、針棒１２の下端部が通過する係合穴５７の前側部分に形成され且つ（針棒糸案内１９の針棒１２への取付時において）後方に突出する突部５０ａが挿入され、その突部５０ａの左右方向の幅は、針棒１２の溝１２ａの左右方向の幅よりもほんの僅かだけ狭くなっており、針棒糸案内１９の針棒１２への取付時において、突部５０ａの左右端部は、針棒１２の溝１２ａの左右の内面に夫々接する。その突部５０ａの前後方向の長さは、針棒１２の溝１２ａの前後の奥行きよりも短く、縫針１５の最上部が針棒１２の溝１２ａにおいて、突部５０ａよりも上方に位置し、突部５０ａの後方に縫針１５の上端部が位置するように、突部５０ａが形成されている。即ち、突部５０ａは、針棒１２に針棒糸案内１９を取り付ける際の回り止めとして機能する。
【００５１】
次に、糸掛け機構２０について説明する。図３、図１１〜図１８に示すように、糸掛け機構２０は、頭部４の下部に固定された水平板状のベース部材６０と、このベース部材６０の下側にスライド可能に付設された可動部材６１と、この可動部材６１の下側に枢着された回動アーム６２と、可動部材６１の下側に枢着され先端に糸掛けフック６３ａを有するフック部材６３であって、この糸掛けフック６３ａ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１１、図１５参照）と糸掛け可能な作用位置（図１２、図１６参照）とに揺動可能で回動アーム６２に連動連結されたフック部材６３と、フック部材６３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６３に付加する為の操作力付加部材６４（図１５、図１６参照）と、操作力付加部材６４に作用した操作力を回動アーム６２に伝達する操作力伝達機構６５（図１５、図１６参照）とを備えている。
【００５２】
この糸掛け機構２０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６４に作用する操作力により、フック部材６３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６３と回動アーム６２を可動部材６１と共にスライド移動させて糸案内１８及び針棒糸案内１９へ糸を掛けるスライド移動と、糸案内１８及び針棒糸案内１９への糸掛け後にフック部材６３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。
【００５３】
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１８及び針棒糸案内１９に近い第１の待機位置（図１１、図１５参照）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１８及び針棒糸案内１９から離れた第２の待機位置（図１４、図１８参照）の２つの待機位置が含まれる。
【００５４】
ベース部材６０は、糸調子機構１４の一部を構成するフレーム部材７０に、２つの支持部材７１，７２（図１５参照）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６０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６２を受け止めて停止させるストッパ部材７３が下方突出状に一体的に形成されている。
【００５５】
可動部材６１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７４，７５によりベース部材６０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６１には、２本のピン部材７４，７５が係合してベース部材６０に対するスライド移動をガイドするガイド溝６１ａが左右方向に延びるように形成されている。
【００５６】
つまり、可動部材６１は、左側のピン部材７４がガイド溝６１ａの左端の位置にある状態（図１１参照）から、右側のピン部材７５がガイド溝６１ａの右端に到達するまで（図１４参照）の所定距離だけスライド移動自在にベース部材６０に付設されている。ガイド溝６１ａの後側にはガイド溝６１ａと平行なスリット６１ｂが形成され、このスリット６１ｂには、可動部材６１を右方（図１１の糸掛け開始端位置）へ弾性付勢する可動部材６１の復帰用のコイルバネ７６が装着されている。
【００５７】
回動アーム６２の基端部は、可動部材６１の右端部の前側部分にピン７７（図１５参照）を介して枢着され、このピン７７には、回動アーム６２を図１１の反時計回りの方向（フック部材６３が待機位置となる方向）へ弾性付勢するねじりバネ７８（図１５参照）が装着されている。回動アーム６２の前後方向中央部の右側部分には、操作力伝達機構６５によりフック部材６３を切換える為の操作力が入力される操作力入力部６２ａが形成されている。回動アーム６２の先端部の左側部分には、後述するように回動アーム６２が可動部材６１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７３に当接する当接部６２ｂが水平突出状に形成されている。
【００５８】
フック部材６３の基端部は可動部材６１にピン７９を介して枢着され、回動アーム６２の先端部とフック部材６３の基端部付近部は、以下に述べる連動機構８０により連動連結されている。従って、フック部材６３の基端部と回動アーム６２の基端部とは共に可動部材６１に枢着され、そのフック部材６３の基端部と回動アーム６２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８０は、回動アーム６２の先端部に形成された切欠き部６２ｃと、フック部材６３の基端部付近部のピン７９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６２ｃに係合するピン８１とを備えている。
【００５９】
フック部材６３が図１１、図１５に示す第１の待機位置にある状態では、フック部材６３の糸掛けフック６３ａは上糸１１から離れているが、この状態から、図１２、図１６に示すように、ねじりバネ７８の付勢力に抗して図１２の時計回りの方向に回動アーム６２がピン７７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６２ｃも角度θ１だけ回動する。このとき、切欠き部６２ｃによってピン８１はピン７９を中心に回転する。
【００６０】
ここで、回動アーム６２の回動中心であるピン７７とピン８１との距離は、ピン７９，８１間の距離よりも大きいため、ピン８１の回動によりフック部材６３が水平な状態で揺動したときに、ピン８１の回動が拡大されて糸掛けフック６３ａはピン７９を中心に図１２の時計回りの方向に回動アーム６２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６３は図１２、図１６に示す作用位置に到達して糸掛けフック６３ａが上糸１１に係合する。但し、フック部材６３は回動アーム６２及び可動部材６１の下方にあり、このフック部材６３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６３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６１が部分的に張り出しており、フック部材６３が所定角度θ２だけ回動すると、フック部材６３の突出部と可動部材６１の張り出した部分（図示略）とが係合して、フック部材６３がそれ以上回動できない。
【００６１】
図１５〜図１８に示すように、操作力付加部材６４は、糸調子機構１４のフレーム部材７０に揺動可能に枢着されている。操作力付加部材６４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６４ａ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６４ａに、フック部材６３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６４は図１５の時計回りの方向に揺動する。
【００６２】
操作力伝達機構６５は、操作力付加部材６４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８５と、リンク部材８５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８５ａと、リンク部材８５の基端部（左端部）に設けられた従動ピン８６と、この従動ピン８６が係合する円弧状のカム溝８７ａを有するカム板８７とを備えている。
【００６３】
リンク部材８５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６４ａに糸カセット１０から操作力が作用して、操作力付加部材６４が図１５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８５は左方へ移動する。ここで、前述のように、可動部材６１はコイルバネ７６により右方へ付勢され、この可動部材６１に回動アーム６２が枢着されているため、先端アーム部８０ａの下端部は回動アーム６２の操作力入力部６２ａに常に当接した状態である。
【００６４】
つまり、左右方向に延びるリンク部材８５を介して操作力を回動アーム６２の操作力入力部６２ａに伝達するが、リンク部材８５の基端部が従動ピン８６を介してカム板８７のカム溝８７ａに案内されているため、操作力付加部材６４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８７ａの円弧に沿って従動ピン８６が移動し、リンク部材８５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８５は、そのリンク部材８５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８５ａは回動アーム６２の操作力入力部６２ａをほぼ水平に左方へ押圧することになり、先端アーム部８５ａと操作力入力部６２ａ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。
【００６５】
次に、この糸掛け機構２０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１１、図１５に示すように、フック部材６３は糸掛けフック６３ａ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３０の下端部がカセット接触部６４ａに当接し、糸カセット１０からカセット接触部６４ａに操作力が作用して、カセット接触部６４ａが図１５の時計回りの方向へ揺動する。
【００６６】
このとき、操作力伝達機構６５により、操作力付加部材６４からリンク部材８５の先端アーム部８５ａを介して回動アーム６２の操作力入力部６２ａに操作力が伝達されると、回動アーム６２を所定角度θ１だけ回動させるとともにフック部材６３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。
【００６７】
即ち、先端アーム部８５ａから操作力入力部６２ａに入力された操作力により、回動アーム６２がピン７７を回転中心として図１１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６２に連動連結されたフック部材６３も、連動機構８０により、糸案内１８と針棒糸案内１９との間で、ピン７９を回転中心として図１１の時計回りの方向へ揺動されて、図１２に示すように、糸掛けフック６３ａ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６３ａが上糸１１に係合する。ここで、糸掛けフック６３ａに確実に上糸１１が掛かるように、図１２に示すフック部材６３の作用位置は、図１１に示す第１の待機位置よりも右方に位置するように構成されている。尚、この回動アーム６２の回動に伴い、回動アーム６２の先端部に形成された当接部６２ｂは左方へ突出した状態となる。
【００６８】
第１揺動後にさらに回動アーム６２に操作力が伝達されると、回動アーム６２は可動部材６１の張り出した部分とフック部材６３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１３、図１７に示すように、作用位置に切換えられたフック部材６３と回動アーム６２とが可動部材６１と共にコイルバネ７６の付勢力に抗して、当接部６２ｂがストッパ部材７３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６３ａに係合した上糸１１がフック部材６３と共に左方へ引き寄せられ、糸案内１８の糸掛け部１８ａと、針棒糸案内１９の第１、第２糸掛け部５５，５９に上糸１１が掛けられる。
【００６９】
図１３、図１７に示すように、当接部６２ｂがストッパ部材７３に当接して、ピン８１が左方向に移動不可となった状態（可動部材６１に対して回動アーム６２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６２ａに操作力が入力されると、フック部材６３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７５がガイド溝６１ａの右端に係合するまで可動部材６１はベース部材６０に対して左方へ移動することになるので、図１４、図１８に示すように、回動アーム６２がピン８１を回転中心として図１４の反時計回りの方向に回動し、連動機構８０によりフック部材６３もピン８１を回転中心として図１４の反時計回りの方向に揺動されて、フック部材６３が第２の待機位置へ切換えられる。
【００７０】
その回動アーム６２の回転に伴って当接部６２ｂがストッパ部材７３に対して摺動する。このときに、糸掛けフック６３ａ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６３ａから外れ、糸案内１８及び針棒糸案内１９への糸掛け動作が完了する。
【００７１】
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、糸掛け機構２０による針棒糸案内１９への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、この糸カセット１０の装着動作に連動して、天秤１３から下流側へ延びる上糸１１が、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に通される。
【００７２】
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２０により糸案内１８及び針棒糸案内１９に上糸１１が掛けられる。即ち、図１１、図１５に示すように、フック部材６３が糸掛けフック６３ａ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６４のカセット接触部６４ａに当接し、糸カセット１０からカセット接触部６４ａに操作力が作用する。
【００７３】
この操作力付加部材６４に作用した操作力が、操作力伝達機構６５により回動アーム６２の操作力入力部６２ａに伝達されると、連動機構８０を介して、先ず、図１２、図１６に示すように、フック部材６３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６３ａに係合する。次に、図１３、図１７に示すように、作用位置に切換えたフック部材６３と回動アーム６２を可動部材６１と共にスライド移動させるスライド移動が行われる。
【００７４】
このようにフック部材６３が左方へ移動することにより、上糸１１が右方から左方へ直線的に移動すると、図８に示すように、まず、上糸１１は、右方へ突出した第２糸案内部５８の後端部に接触して、上糸１１は第２糸案内部５８により後方へ案内される。さらに、上糸１１が左方へ移動すると、上糸１１は曲線状に形成された第１糸案内部５４にも接触する。
【００７５】
そして、第１糸案内部５４に接触する上糸部分１１ｆは、第１糸案内部５４により前方へ案内されて上糸１１が第１糸掛け部５５に糸掛けされる。一方、図９に示すように、第２糸案内部５８に接触する上糸部分１１ｇは、第２糸案内部５８により後方へ案内されて第２糸掛け部５９にも上糸１１が糸掛けされる。
【００７６】
ここで、図８に示すように、第１糸案内部５４と第２糸案内部５８が平面視で左右に交差しているため、第１、第２糸案内部５４，５８により、上糸１１が第１、第２糸掛け部５５，５９から抜けにくくなっている。さらに、第１、第２糸掛け部５５，５９は、互いに反対側に開放状に形成されているため、第１糸掛け部５５に糸掛けされた上糸部分１１ｆは、第１糸掛け部５５から抜けないように第２糸掛け部５９で規制され、逆に、第２糸掛け部５９に糸掛けされた上糸部分１１ｇは、第２糸掛け部５９から抜けないように第１糸掛け部５５で規制される。従って、上糸１１が第１、第２糸掛け部５５，５９に糸掛けされた状態では、上糸１１は、縫針１５の近傍位置に位置規制されて縫針１５に沿った状態に保持される。
【００７７】
この状態から、さらに、図１４、図１８に示すように、フック部材６３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６３ａから上糸１１が外れて糸掛け動作が完了する。
【００７８】
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。
【００７９】
１）上糸１１を前方及び後方へ夫々案内する第１，第２糸案内部５４，５８が、平面視で互いに交差しており、さらに、第１、第２糸掛け部５５，５９が夫々前方及び後方へ開放状に形成されているため、外部へ開放状の第１，第２糸掛け部５５，５９に掛けられた上糸１１が抜けにくい。また、第１，第２糸掛け部５５，５９により、上糸１１が縫針１５の近傍位置に位置規制された状態が保持されるので、縫製中に上糸１１が針棒１２の下端部付近で無用に振れるのを確実に防止することができる。
【００８０】
２）第１糸案内部５４が曲線状に形成されているため、糸掛け機構２０により上糸１１を左方に移動させたときに、第１糸案内部５４により上糸１１を前方にスムーズに案内して、上糸１１を第１糸掛け部５５に確実に導入することができる。
【００８１】
３）第２糸案内部５８は、第１糸案内部５４よりも水平且つ右斜め前方へ突出状に形成されているので、糸掛け機構２０により上糸１１が右方から左方へ移動する際に、上糸１１が第２糸案内部５８の後端部に確実に当接して、上糸１１が第２糸案内部５８により後方へ案内される。さらに、上糸１１が左方へ移動すると、上糸１１が曲線状の第１糸案内部５４にも当接して、上糸１１が第１糸案内部５４により前方へ案内される。つまり、第１、第２糸案内部５４，５８の両方により確実に上糸１１を第１、第２糸掛け部５５，５９まで案内することができる。
【００８２】
４）第１、第２針棒糸案内５０，５１は、糸カセット１０と縫針１５の目孔１５ａとの間の上糸１１を針棒１２の下端部において案内するように構成されているので、糸カセット装着型のミシンＭにおいては、糸カセット１０とカセット装着部５との間に形成される空間等により糸路がやや不安定になる場合も想定されるが、このような場合でも、糸カセット１０から導出された上糸１１を、第１，第２針棒糸案内５０，５１により縫針１５の目孔１５ａに向かうように確実に案内できるので、上糸１１の振れを極力防止できる。
【００８３】
５）第１、第２針棒糸案内５０，５１を金属板で一体形成したので、針棒糸案内１９を頭部４に容易に取り付けることができるし、取付の際の面倒な調整作業も不要になる。
【００８４】
６）糸掛け機構２０により上糸１１を左方に直線的に移動させるだけで、上糸１１が第１，第２糸案内部５４，５８により第１、第２糸掛け部５５，５９まで案内されて、第１、第２糸掛け部５５，５９に上糸１１が糸掛けされるので、針棒糸案内１９への糸掛け作業が容易になる。
【００８５】
次に、前記実施の形態に種々の変更を加えた変更形態について説明する。但し、前記実施の形態と同様の構成については、同じ符号を付してその説明を省略する。
【００８６】
１］前記実施の形態においては、糸カセット１０の装着動作に連動して自動的に針棒糸案内１９に上糸１１を掛けるように構成したミシンに本発明を適用したが、作業者が手で直接針棒糸案内１９に上糸１１を掛けるように構成したミシンにも本発明を適用できる。この場合でも、所定の方向へ上糸１１を手で直線的に移動させるだけで針棒糸案内１９に上糸１１を掛けることができるため、糸掛け作業が容易になる。
【００８７】
２］前記実施の形態では、糸通し機構１６により縫針１５の目孔１５ａに上糸１１が通された後に、針棒糸案内１９に上糸１１が掛けられるように構成してあるが、目孔１５ａへの糸通し作業の前、あるいは、糸通し作業と同時に、針棒糸案内１９に上糸１１が掛けられるように構成してもよい。
【００８８】
３］第１糸案内部５４の右端部の形状は前記実施の形態のような曲線状に限らず、図１９に示すように、第１針棒糸案内５０Ａにおいて、上糸１１を左方に直線的に移動させて第１糸掛け部５５に上糸１１を掛けられる範囲内で、第１糸案内部５４Ａを直線状に形成してもよい。また、第１糸掛け部５５の形状についても、前記実施の形態のような直角的な形状に限るわけではなく、図２０に示すように、第１針棒糸案内５０Ｂにおいて、第２糸掛け部５９から上糸１１が外れない範囲内で、第１糸掛け部５５Ｂを実線や鎖線で示すような曲線的な形状に形成してもよい。
【００８９】
４］前記実施の形態では、針棒１２にこの針棒１２と別部材の金属板で構成した針棒糸案内１９を取り付けているが、針棒糸案内を針抱きを介して針棒に取り付けてもよいし、針棒糸案内を針棒又は針抱きに一体的に設けてもよい。また、第１、第２針棒糸案内を合成樹脂等、他の材質の部材で一体形成してもよい。
【００９０】
５］前述の実施の形態では、第１針棒糸案内５０及び第２針棒糸案内５１が何れも単なる水平且つ平坦な板の端部によって、第１針棒糸案内５０や第２針棒糸案内５１から上糸１１が外れるのを防止しているが、糸掛けに支障がない限り、必要に応じて、さらに、糸外れ防止の為の部分を追加してもよい。具体的には、図２１〜図２４に示すように、第１糸案内部５４の左端部においてそこから下方に向かって突出する突出部１００と、第１針棒糸案内５０Ｃと第２の針棒糸案内５１との上下方向の間において、連結部２５Ｃの前端部から水平方向（右方）に伸展する水平伸展部２００とを有し、その突出部１００及び水平伸展部２００が第１針棒糸案内５０Ｃの第１糸掛け部５５と第２針棒糸案内５１の第２糸掛け部５９との間に亙る糸部分１１ｈに接触可能に配置されている。尚、図２４に示すように、第１針棒糸案内５０Ｃの第１糸掛け部５５に掛けられた糸部分１１ｆは、第２針棒糸案内５１の第２糸掛け部５９に掛けられた糸部分１１ｇよりも前方にあり、糸部分１１ｆと糸部分１１ｇとの間に亙る糸部分１１ｈは斜めに亙っている。その斜めに亙った糸部分１１ｈの右方に突出部１００が位置し、その斜めに亙った糸部分１１ｈの下方且つ前方に水平伸展部２００が位置する。
【００９１】
従って、例えば、縫製中の天秤１３の上下揺動により糸部分１１ｈにたるみが生じたとしても、突出部１００及び水平伸展部２００により糸部分１１ｈの右方向（第１糸掛け部５５又は第２糸掛け部５９が開放する方向）、上下方向、並びに、前後方向の移動が規制されるので、第１糸掛け部５５と第２糸掛け部５９から上糸１１が抜けにくくなる。
【００９２】
この突出部１００と水平伸展部２００とは、何れか一方だけを設けるようにしてもよい。また、突出部１００や水平伸展部２００に対して糸部分１１ｈが常時接触するように構成してもよいし、糸部分１１ｈが所定の方向に大きく移動したときにだけ、糸部分１１ｈが突出部１００や水平伸展部２００に一時的に接触するようにしてもよい。さらには、前述の水平伸展部２００は、第１針棒糸案内５０Ｃの第１糸掛け部５５と第２針棒糸案内５１の第２糸掛け部５９との間に亙る糸部分１１ｈの上下方向、及び前後方向の移動を規制するが、水平伸展部２００が、糸部分１１ｈの上下方向あるいは前後方向の何れか一方のみの移動を規制するように構成してもよい。尚、以上説明した変更形態（図２１〜図２４）は、請求項８〜１１の発明を適用した一例である。
【００９３】
６］図２５〜図２８に示すように、第１針棒糸案内５０Ｄの第１糸掛け部５５Ｄが、縫製時の上糸１１を案内するガイド穴１１０と、このガイド穴１１０よりも左右方向の幅が狭くこのガイド穴１１０をその外部と連通させる開放部１１１とを有し、第１糸案内部５４Ｄが前記ガイド穴１１０よりも縫針１５側に位置するように構成してもよい。即ち、第１針棒糸案内５０Ｄは、取付板部５６と一体的に連結され後方に位置する水平板部１１２と、この水平板部１１２からさらに水平前方へ突出し前方に位置する突出板部１１３とを有する。水平板部１１２の右側部分には、右方から左方へ移動する上糸１１を前方へ案内する第１糸案内部５４Ｄが曲線状に形成されている。
【００９４】
一方、突出板部１１３の左右方向略中央部にはガイド穴１１０が形成されており、このガイド穴１１０は、第２針棒糸案内５１の第２糸掛け部５９よりも前方（縫針１５と反対側）に位置している。そして、このガイド穴１１０は、第２糸掛け部５９に糸掛けされる上糸１１の移動方向（左右方向）と交差する前後方向に長く伸展する長穴状に形成されている。さらに、このガイド穴１１０よりも、第１糸案内部５４Ｄが縫針１５側（後方）に位置しており、ガイド穴１１０の後端部（縫針１５側の端部）には左方へ水平に突出する突起部１１４が形成されている。そして、この突起部１１４により、ガイド穴１１０の後端部において、ガイド穴１１０よりも左右方向の幅が狭くガイド穴１１０をその外部と連通させる開放部１１１が形成されている。さらに、開放部１１１は前後方向に伸展しており、ガイド穴１１０の後端部において突起部１１４に左方から対向する部分が第１糸案内部５４Ｄの終端部（左端部）と滑らかに接続されている。
【００９５】
突出板部１１３の右側部分には、右方から後方へ湾曲するガイド部１１５が形成され、第１糸案内部５４Ｄとガイド部１１５の間には、左方ほど前後方向の幅が狭くなる隙間１１６が形成されている。そして、開放部１１１を介してこの隙間１１６とガイド穴１１０とが連通しており、ガイド穴１１０がその後端部において後方へ開放されている。
【００９６】
この第１針棒糸案内５０Ｄを備えた針棒糸案内１９Ｄに対して、上糸１１が右方から移動してくると、まず、上糸１１が、第２針棒糸案内５１の第２糸案内部５８に当接して、その当接した糸部分１１ｇが第２糸案内部５８により後方へ案内される。そして、糸部分１１ｇよりも上側の糸部分１１ｆが、第１糸案内部５４Ｄにより前方へ案内される。このとき、糸部分１１ｆは、第１糸案内部５４Ｄとガイド部１１５との間の隙間１１６に導かれ、糸部分１１ｆが第１糸案内部５４Ｄの終端部に到達すると、開放部１１１により糸部分１１ｆは上糸１１の移動方向と交差する前方へ案内されて、ガイド穴１１０内に導かれる。同時に、前記実施の形態と同様に糸部分１１ｇが第２糸掛け部５９に糸掛けされる。
【００９７】
ここで、第２糸掛け部５９がガイド穴１１０よりも縫針１５側に位置しているので、ガイド穴１１０内に導かれた糸部分１１ｆは後方へ引きつけられ、突起部１１４の前側部分に係合し、図２８に示すように、糸部分１１ｆと糸部分１１ｇとの間の糸部分１１ｈが後方へ傾いた状態で糸掛けされて、針棒糸案内１９Ｄへの糸掛けが完了する。ここで、ガイド穴１１０は前後方向に伸展するように形成されているので、縫製中には、ガイド穴１１０において糸部分１１ｆに適度な遊びが得られる。尚、以上説明した変更形態（図２５〜図２８）は、請求項１１〜１３及び請求項１５の発明を適用した一例である。
【００９８】
７］図２９〜図３２に示すように、第１針棒糸案内５０Ｅの第１糸掛け部５５Ｅが、縫製時の上糸１１を案内するガイド穴１２０と、このガイド穴１２０よりも前後方向の幅が狭くこのガイド穴１２０をその外部と連通させる開放部１２１とを有し、前記ガイド穴１２０が第１糸案内部５４Ｅの終端部よりも縫針１５側に位置するように構成してもよい。即ち、第１針棒糸案内５０Ｅにおいて、第１糸案内部５４Ｅの前端部の後側にガイド穴１２０が形成され、このガイド穴１２０は、第２針棒糸案内５１の第２糸掛け部５９よりも前方（縫針１５と反対側）に位置している。そして、このガイド穴１２０は、第２糸掛け部５９に糸掛けされる上糸１１の移動方向と交差する前後方向に長く伸展する長穴状に形成されている。
【００９９】
ガイド穴１２０の左端部には、前方及び後方に夫々突出する前後１対の突起部１２２，１２３が形成され、ガイド穴１２０の後側部分の左端部は、後側の突起部１２３よりもさらに左方へ入り込むように形成されている。そして、前後１対の突起部１２２，１２３の間には、ガイド穴１２０よりも前後方向の幅が狭くガイド穴１２０をその外部と連通させる開放部１２１が形成されている。この開放部１２１は左右方向に伸展しており、開放部１２１によりガイド穴１２０は左方へ開放されている。また、第１糸案内部５４Ｅの左端部の後側部分には、左方から後方へ傾斜して前側の突起部１２２に連なり上糸１１をガイド穴１２０まで案内する案内部１２４が形成されている。
【０１００】
この第１針棒糸案内５０Ｅを備えた針棒糸案内１９Ｅに対して、上糸１１が右方から移動してくると、まず、上糸１１が、第２針棒糸案内５１の第２糸案内部５８に当接して、その当接した糸部分１１ｇが第２糸案内部５８により後方へ案内される。次に、糸部分１１ｇよりも上側の糸部分１１ｆが、第１糸案内部５４Ｅにより前方へ案内される。そして、糸部分１１ｆが第１糸案内部５４Ｅの左端部に到達すると、糸部分１１ｆはこの第１糸案内部５４Ｅの左端部から案内部１２４で案内されながら右後方へ移動して、糸部分１１ｆが開放部１２１を通って左方からガイド穴１２０へ導かれる。同時に、前記実施の形態と同様に糸部分１１ｇが第２糸掛け部５９に糸掛けされる。
【０１０１】
ここで、第２糸掛け部５９がガイド穴１２０よりも縫針１５側に位置しているので、ガイド穴１２０内に導かれた糸部分１１ｆは後方へ引きつけられて、ガイド穴１２０の後端部に糸部分１１ｆが係合し、図３２に示すように、糸部分１１ｆと糸部分１１ｇとの間の糸部分１１ｈが後方へ傾いた状態で糸掛けされて、針棒糸案内１９Ｅへの糸掛けが完了する。ここで、ガイド穴１２０は前後方向に伸展するように形成されているので、縫製中に、ガイド穴１２０において糸部分１１ｆに適度な遊びが得られる。尚、以上説明した変更形態（図２９〜図３２）は、請求項１１、１２、１４、１５の発明を適用した一例である。
【０１０２】
【発明の効果】請求項１の発明によれば、上糸を上糸の移動方向と交差する方向へ夫々案内する第１，第２糸案内部が、平面視で互いに交差するように構成されているため、これら第１，第２糸案内部により、外部へ開放状に形成された第１，第２糸掛け部から上糸が抜けにくくなる。
【０１０３】
請求項２の発明によれば、第１、第２糸掛け部の一方において、他方の糸掛け部により一方の糸掛け部から上糸が抜けないように規制されて、第１，第２糸掛け部により上糸が縫針の近傍位置に位置規制された状態が保持されるため、縫製中に針棒の下端部付近で上糸が無用に振れるのを防止することができる。
【０１０４】
請求項３の発明によれば、第１糸案内部が曲線状又は直線状に形成されているため、糸掛け機構により上糸を所定の移動方向に移動させたときに、第１糸案内部により上糸を前記所定の移動方向と交差する方向に確実に案内して、第１糸掛け部に上糸を導入することができる。
【０１０５】
請求項４の発明によれば、第２糸案内部は、第１糸案内部よりも水平方向外側へ突出状に形成されているので、糸掛けされる上糸が最初に第２糸案内部に接触して、第２糸案内部により上糸が第１糸案内部にも接触するように案内されるため、第１、第２糸案内部の両方により確実に上糸を第１、第２糸掛け部まで案内することができる。
【０１０６】
請求項５の発明によれば、糸カセット装着型のミシンにおいて、糸カセットとカセット装着部との間に形成される空間等により糸路がやや不安定になる虞がある場合でも、糸カセットの糸供給源から導出された上糸を第１，第２針棒糸案内により縫針の目孔に向かうように確実に案内できるため、針棒の下端部付近で上糸が無用に振れるのを防止できる。
【０１０７】
請求項６の発明によれば、第１、第２針棒糸案内を金属板で一体形成したので、針棒糸案内を針棒の下端部に容易に取り付けることができる。
【０１０８】
請求項７の発明によれば、上糸を所定の移動方向に直線的に移動させるだけで、上糸が第１，第２糸案内部により第１、第２糸掛け部まで案内されて、第１、第２糸掛け部に上糸が糸掛けされるので、針棒糸案内への糸掛け作業が容易になる。
【０１０９】
請求項８の発明によれば、突出部により上糸の水平方向の移動が規制されるので、第１の針棒糸案内や第２の針棒糸案内から上糸が外れにくくなっている。
【０１１０】
請求項９の発明によれば、水平伸展部により上糸の上下方向あるいは前後方向の少なくとも一方の移動が規制されるので、第１の針棒糸案内や第２の針棒糸案内から上糸が外れにくくなっている。
【０１１１】
請求項１０の発明によれば、突出部及び水平伸展部により、上糸の水平方向の移動及び、上糸の上下方向あるいは前後方向の少なくとも一方の移動が規制されるので、第１の針棒糸案内や第２の針棒糸案内から上糸が外れにくくなっている。
【０１１２】
請求項１１の発明によれば、糸掛けの際に、上糸が所定の方向に移動すると、上糸はガイド穴よりも幅の狭い開放部を通ってガイド穴内に導入されるため、上糸がガイド穴から抜けにくくなり、第１の針棒糸案内や第２の針棒糸案内から上糸が外れにくくなる。
【０１１３】
請求項１２の発明によれば、ガイド穴が、第２糸掛け部に糸掛けされる上糸の移動方向と交差する方向に伸展するように形成されているので、上糸が所定の方向に移動してガイド穴内に導かれると、ガイド穴内で上糸に適度な遊びが得られる。
【０１１４】
請求項１３の発明によれば、上糸が、第１糸案内部により上糸の移動方向と交差する方向に案内された後に、ガイド穴の縫針側の端部から縫針から離れる方向に移動して、上糸がガイド穴内に導かれるので、ガイド穴から上糸が抜けにくくなる。
【０１１５】
請求項１４の発明によれば、上糸が、第１糸案内部により上糸の移動方向と交差する方向に案内された後に、第１糸案内部の終端部から縫針側へ移動して、上糸がガイド穴内に導かれるため、ガイド穴から上糸が抜けにくくなる。
【０１１６】
請求項１５の発明によれば、上糸が第１糸掛け部のガイド穴に案内されている状態で、上糸はガイド穴よりも縫針側に位置する第２糸掛け部にも掛けられるので、第１、第２針棒糸案内から上糸が外れにくくなる。
【０１１７】
請求項１６の発明によれば、請求項１の発明と略同様の効果が得られるので、その説明を省略する。
【図面の簡単な説明】
【図１】本発明の実施の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】糸通し動作直後の頭部の要部側面図である。
【図５】糸カセットの正面図である。
【図６】糸カセットの左側面図である。
【図７】糸カセットの底面図である。
【図８】針棒糸案内の平面図である。
【図９】図８の底面図である。
【図１０】図８の正面図である。
【図１１】糸掛け機構の底面図（糸掛け動作直前）である。
【図１２】糸掛け機構の底面図（第１揺動後）である。
【図１３】糸掛け機構の底面図（スライド移動後）である。
【図１４】糸掛け機構の底面図（第２揺動後）である。
【図１５】図１１の正面図である。
【図１６】図１２の正面図である。
【図１７】図１３の正面図である。
【図１８】図１４の正面図である。
【図１９】変更形態の針棒糸案内の平面図である。
【図２０】変更形態の針棒糸案内の底面図である。
【図２１】変更形態の針棒糸案内の平面図である。
【図２２】変更形態の針棒糸案内の底面図である。
【図２３】変更形態の針棒糸案内の正面図である。
【図２４】変更形態の針棒糸案内の右側面図である。
【図２５】変更形態の針棒糸案内の平面図である。
【図２６】変更形態の針棒糸案内の底面図である。
【図２７】変更形態の針棒糸案内の正面図である。
【図２８】変更形態の針棒糸案内の右側面図である。
【図２９】変更形態の針棒糸案内の平面図である。
【図３０】変更形態の針棒糸案内の底面図である。
【図３１】変更形態の針棒糸案内の正面図である。
【図３２】変更形態の針棒糸案内の右側面図である。
【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
１２ 針棒
１５ 縫針
１５ａ 目孔
１９，１９Ｄ，１９Ｅ 針棒糸案内
２０ 糸掛け機構
５０，５０Ａ，５０Ｂ，５０Ｃ，５０Ｄ，５０Ｅ 第１針棒糸案内
５１ 第２針棒糸案内
５４，５４Ａ，５４Ｄ，５４Ｅ 第１糸案内部
５５，５５Ｂ，５５Ｄ，５５Ｅ 第１糸掛け部
５８ 第２糸案内部
５９ 第２糸掛け部
１００ 突出部
２００ 水平伸展部
１１０，１２０ ガイド穴
１１１，１２１ 開放部[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine and a needle bar thread guide of the sewing machine. More particularly, the present invention relates to a needle bar thread guide which can be easily threaded and an upper thread hung on the needle bar thread guide does not easily come off. It is related to what was comprised as follows.
[0002]
2. Description of the Related Art Conventionally, at the lower end of a needle bar of a sewing machine, there is provided a needle bar thread guide for guiding an upper thread hung on a balance along the needle bar to an eye of a sewing needle. The needle thread is threaded on the needle bar thread guide before sewing to prevent the needle thread from unnecessarily swinging near the lower end of the needle bar when the needle bar moves up and down during sewing. be able to.
[0003]
Various needle bar thread guides have already been proposed. For example, in a sewing machine described in Patent Literature 1, a first thread hook portion formed in an open shape in one direction and a first thread hook portion are provided. A second thread hook formed in an unbroken ring shape below the first thread hook is provided at the lower end of the needle bar, and before the upper thread is passed through the eye of the sewing needle, By placing the upper thread on the first thread catcher and then passing the upper thread through the second thread catcher from above, the position of the upper thread can be restricted to a position near the sewing needle, and the upper thread during sewing Can be prevented.
[0004]
Further, the sewing machine described in Patent Document 2 is provided with a slit provided above the needle holder and having a slit opened to one side, and provided on the lower side of the thread guide device and the needle holder and formed in an open shape on one side. The needle bar thread guide is provided so that the upper thread can be easily hooked on both the open slit and the needle bar thread guide.
[0005]
[Patent Document 1] Japanese Patent Publication No. 58-35720 (page 2, FIG. 1-2)
[Patent Document 2] JP-A-11-489 (page 3-5, FIG. 4)
[0006]
However, in the sewing machine described in Patent Document 1, since the second thread hooking portion is formed in a ring shape without a break, the thread hooking to the second thread hooking portion is performed. The work must be performed by passing the thread from above, and the thread hooking operation is time-consuming.
[0007]
Further, in the sewing machine described in Patent Document 2, both the thread guide device and the needle bar thread guide provided above the needle holder are formed to be open to one side, respectively. When the upper thread has a large run-out, such as when sewing is performed using a thread, the upper thread may easily come off from the thread guide device or the needle bar thread guide.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to make it possible to easily thread a needle bar thread guide and to make it difficult for an upper thread hooked on the needle bar thread guide to come off.
[0009]
According to a first aspect of the present invention, there is provided a sewing machine provided with a needle bar thread guide attached to a needle bar disposed on the sewing machine head so as to be vertically movable and guiding an upper thread toward an eye hole of a sewing needle. In the sewing machine, the needle bar thread guide is provided with a first needle bar thread guide provided at a lower end portion of the needle bar and a predetermined interval below the first needle bar thread guide. A second needle bar thread guide provided at a lower end portion, wherein the first needle bar thread guide guides the upper thread in a direction intersecting the moving direction of the upper thread to be threaded. And a first yarn hooking portion which is openable to the outside where the upper yarn guided by the first yarn guiding portion can be introduced and can be hooked, and the second needle bar thread guide is threaded. A second thread guide for guiding the upper thread in a direction intersecting with the direction of movement of the upper thread, and an outer thread for introducing the upper thread guided by the second thread guide to allow threading. And a discharge-shaped second thread guard, the first, in which the second thread guide portion is configured to intersect each other in plan view.
[0010]
Before the sewing operation by the sewing machine, the upper thread is hung on the first and second needle bar thread guides of the needle bar thread guide provided at the lower end of the needle bar. That is, first, in the first needle bar thread guide, the upper thread is guided by the first thread guide section in a direction intersecting the moving direction of the upper thread, and the upper thread is guided to the first thread hooking section which is open to the outside. After being introduced, the upper thread is hooked on the first thread hooking section. On the other hand, also in the second needle bar thread guide, the upper thread is guided by the second thread guide section in a direction intersecting with the moving direction of the upper thread, and the upper thread is introduced to the second thread hooking section which is open to the outside. Then, the upper thread is hooked on the second thread hooking section. Here, since the first and second yarn guides are configured to intersect each other in a plan view, the upper and lower yarns are pulled out of the first and second yarn hooks by the first and second yarn guides. Not regulated.
[0011]
According to a second aspect of the present invention, in the first aspect of the invention, the first and second thread hooks are formed in an open shape on opposite sides to each other, and the first and second thread hooks attach upper needles to sewing needles. The position is restricted to a nearby position. Therefore, the upper thread portion hooked on one of the first and second thread hooking portions is regulated by the other thread hooking portion so as not to come off from the one thread hooking portion. The state of being hooked on the two-thread hooking portion is maintained, and the position of the upper thread is restricted to a position near the sewing needle.
[0012]
The sewing machine according to a third aspect of the present invention is the sewing machine according to the first or second aspect, further comprising a thread hooking mechanism configured to move the upper thread in a predetermined moving direction to thread the first and second thread hooking sections. The yarn guide is formed in a curved shape or a straight shape. Therefore, when the upper thread is linearly moved in the predetermined moving direction by the thread hooking mechanism, the upper thread is guided to the first thread hooking section by the curved or linear first thread guide section.
[0013]
A sewing machine according to a fourth aspect of the present invention is the sewing machine according to any one of the first to third aspects, wherein the second thread guide is formed so as to protrude horizontally outward from the first thread guide. Therefore, the upper thread to be threaded first contacts the second thread guide, and then is guided by the second thread guide so that the upper thread also contacts the first thread guide. The upper thread is guided by both of the second thread guides to the first and second thread hooks.
[0014]
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the sewing machine head includes a cassette mounting portion for mounting a thread cassette having a thread supply source, and the first and second needles. The bar thread guide is configured to guide the upper thread between the thread cassette and the eye of the sewing needle. Accordingly, the upper thread derived from the thread supply source of the thread cassette is guided toward the eye hole of the sewing needle by the first and second needle bar thread guides.
[0015]
A sewing machine according to a sixth aspect is the sewing machine according to any one of the first to fifth aspects, wherein the first and second needle bar thread guides are formed integrally with a metal plate. Accordingly, the first and second needle bar thread guides integrally formed of the metal plate guide the upper thread toward the eye of the sewing needle.
[0016]
In the sewing machine according to claim 7, in the invention according to any one of claims 1 to 6, when the upper thread is moved in a predetermined moving direction, the upper thread is guided by the first and second thread guides, and The first and second threading portions are configured to be threaded. Therefore, when the upper thread is moved linearly in a predetermined moving direction, the upper thread is guided to the first and second thread hooking portions by the first and second thread guide portions, and the first and second thread hooking portions are guided. Threaded.
[0017]
The sewing machine according to an eighth aspect of the present invention is the sewing machine according to any one of the first to seventh aspects, further comprising a protruding portion that protrudes downward from the first thread guide, and the protruding portion is the first needle bar thread guide. And the second needle bar thread guide so as to be able to contact the upper thread. Therefore, the horizontal movement of the upper thread is regulated by the protruding portion.
[0018]
According to a ninth aspect of the present invention, there is provided the sewing machine according to any one of the first to seventh aspects, wherein the horizontal needle extends in the horizontal direction between the first needle bar thread guide and the second needle bar thread guide. It has an extension part, and the horizontal extension part is arranged so as to be able to contact the upper thread extending between the first needle bar thread guide and the second needle bar thread guide. Therefore, at least one of the movement of the upper thread in the up-down direction or the front-rear direction is restricted by the horizontal extension portion.
[0019]
The sewing machine according to claim 10, wherein a horizontal portion is provided between a projecting portion projecting downward from the first thread guide portion and the vertical direction between the first needle bar thread guide and the second needle bar thread guide. A horizontal extending portion extending in the direction, and the protrusion and the horizontal extending portion are arranged so as to be able to contact the upper thread extending between the first needle bar thread guide and the second needle bar thread guide. Is what it is. Therefore, the movement of the upper thread in the horizontal direction and the movement of the upper thread in at least one of the up-down direction and the front-rear direction are regulated by the protrusion and the horizontal extension.
[0020]
In the sewing machine according to the eleventh aspect, in the invention according to the first to tenth aspects, the first thread hooking portion has a guide hole for guiding an upper thread at the time of sewing, and the guide hole having a width smaller than that of the guide hole. And an open part communicating with the opening. Therefore, when the upper thread moves in a predetermined direction during thread hooking, the upper thread is guided from the outside of the guide hole into the guide hole through the opening, and the upper hole is moved to a predetermined position near the sewing needle by the guide hole. You will be in a guided state.
[0021]
In a sewing machine according to a twelfth aspect, in the invention according to the first to eleventh aspects, the first thread hooking portion has a guide hole for guiding an upper thread at the time of sewing, and the guide hole is formed in the second thread hooking portion. It is formed so as to extend in a direction intersecting the moving direction of the upper thread to be threaded. Therefore, when the upper thread moves in a predetermined direction and is guided into the guide hole at the time of thread hooking, the upper thread is guided to a predetermined position near the sewing needle with an appropriate play in the guide hole.
[0022]
In a sewing machine according to a thirteenth aspect, in the invention according to the eleventh or twelfth aspect, the first thread guide portion is located closer to the sewing needle than the guide hole, and the guide hole is provided at an end of the sewing needle side. It is formed in an open shape. Accordingly, in the first needle bar thread guide, the upper thread is guided by the first thread guide in a direction intersecting the moving direction of the upper thread, and then moves in a direction away from the sewing needle from the sewing needle side end of the guide hole. Then, the upper thread is guided into the guide hole.
[0023]
A sewing machine according to a fourteenth aspect is the sewing machine according to the eleventh or twelfth aspect, wherein the guide hole is located closer to the sewing needle than a terminal end of the first thread guide. Therefore, in the first needle bar thread guide, the upper thread is guided by the first thread guide in the direction intersecting the moving direction of the upper thread, and then moves from the terminal end of the first thread guide to the sewing needle. Thus, the upper thread is guided into the guide hole.
[0024]
In a sewing machine according to a fifteenth aspect, in the invention according to the eleventh to fourteenth aspects, the second thread hooking part is located closer to the sewing needle than the guide hole. Accordingly, the upper thread is inclined toward the sewing needle while being guided by the guide hole of the first thread hooking section, and the upper thread is also hooked on the second thread hooking section.
[0025]
17. The needle bar thread guide of a sewing machine according to claim 16, wherein the needle bar thread guide of the sewing machine includes a needle bar that is vertically movable on a sewing machine head. First and second needle bar thread guides, wherein the first and second needle bar thread guides are formed integrally with a metal plate, and the first needle bar thread guide is A first thread guide that guides the upper thread in a direction intersecting with the direction of movement of the thread, and a first thread hook that is open to the outside where the upper thread guided by the first thread guide can be introduced and threaded. A second thread guide section for guiding the upper thread in a direction intersecting with the moving direction of the upper thread to be threaded, and the second needle bar thread guide is guided by the second thread guide section. A second yarn hooking portion which is open to the outside where the upper yarn can be introduced and can be hooked, and the first and second yarn guides are configured to cross each other in plan view. It is intended. Since the needle bar thread guide has substantially the same operation as the needle bar thread guide of the sewing machine of the first aspect, the description thereof is omitted.
[0026]
Embodiments of the present invention will be described. In the present embodiment, a case where the present invention is applied to a household sewing machine configured to automatically hang an upper thread on a needle bar thread guide provided on a needle bar in conjunction with a mounting operation of a thread cassette. This is an example.
[0027]
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.
[0028]
As shown in FIGS. 2 to 4, the head 4 has a needle bar 12 movably arranged vertically, a balance 13 movably arranged vertically, and an upper thread 11 drawn out from the thread cassette 10. A thread tension mechanism 14 for adjusting the thread tension of the needle threader 10 for automatically threading the upper thread 11 through the eye 15a of the sewing needle 15 supported by the needle bar 12 when the thread cassette 10 is mounted on the cassette mounting section 5. A mechanism 16, a thread holding mechanism 17 for holding the upper thread 11 near the eye hole 15 a of the sewing needle 15 for threading by the threading mechanism 16, a thread guide 18 provided near the lower end of the head 4, and a needle bar 12. A needle bar thread guide 19 that guides the upper thread 11 toward the eye hole 15a of the sewing needle 15, a thread guide 18, and a thread hooking mechanism 20 that automatically hooks the needle bar thread guide 19 are provided. 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. Have been.
[0029]
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, as shown in FIG. 4, 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, and then passed through the eye hole 15a by the threading mechanism 16. Then, the upper thread 11 is hooked on the thread guide 18 and the needle bar thread guide 19 by the thread hooking mechanism 20, and the upper thread 11 is set to be sewable. Here, the respective operations of the threading mechanism 16, the thread holding mechanism 17, and the thread hooking mechanism 20 are automatically performed in conjunction with the mounting operation of the thread cassette 10.
[0030]
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. .
[0031]
Here, the yarn cassette 10 will be described. As shown in FIGS. 5 to 7, the yarn cassette 10 has a cassette main body 30 and an opening / closing member 31 pivotally attached to the cassette main body 30. A yarn storage section 33 for storing is formed.
[0032]
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.
[0033]
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.
[0034]
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.
[0035]
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. 4). At this time, the upper thread 11 held near the eye 15a by the thread holding mechanism 17 is pulled out from the eye 15a by the threading hook 42 of the threading mechanism 16 that can pass through the eye 15a, The thread 11 is passed.
[0036]
Next, the needle bar thread guide 19 will be described. As shown in FIGS. 2, 3, and 8 to 10, the needle bar thread guide 19 includes a first needle bar thread guide 50 provided at the lower end of the needle bar 12, and a first needle bar thread guide 50. And a second needle bar thread guide 51 provided at a lower end of the needle bar 12 at a predetermined interval below the first and second needle bar thread guides 50, 51. These first and second needle bar thread guides 50, 51 are integrally formed of a metal plate. Is formed. The first and second needle bar thread guides 50 and 51 are integrally connected by a vertical plate-shaped connecting portion 52. As shown in FIG. 10, the needle bar thread guide 19 has a needle holder 53 for holding the sewing needle 15. (See FIGS. 11 to 18) are formed in an inverted U-shape in front view so as to sandwich them from above and below. The needle bar thread guide 19 is attached to the lower end of the needle bar 12 such that the connecting portion 52 is located on the left side of the needle holder 53 when viewed from the front of the sewing machine M. The upper thread 11 is hooked on the first and second needle bar thread guides 50 and 51 only by moving the upper thread 11 linearly to the left by the thread hooking mechanism 20 described in detail later. .
[0037]
As shown in FIGS. 8 to 10, the first needle bar thread guide 50 includes a first thread guide section 54 that guides the upper thread 11 forward, and an upper thread 11 guided by the first thread guide section 54. It has a first threading portion 55 that can be introduced and threaded and that is open frontward. The first thread guide 54 guides the upper thread 11 in a direction (frontward) intersecting (substantially orthogonal) with the moving direction (leftward) of the upper thread 11 to be threaded. The first needle bar thread guide 50 is integrally provided with a vertical plate-shaped mounting portion 56 for mounting the needle bar thread guide 19 to the needle bar 12. Further, the first needle bar thread guide 50 is also provided with an engagement hole 57 that can be engaged with the lower end of the needle bar 12.
[0038]
The first thread guide portion 54 is formed so as to protrude forward in the horizontal direction and further, so that the upper thread 11 that has moved from right to left by the later-described thread hooking mechanism 20 can be smoothly guided forward. The right end of the first thread guide 54 is formed in a curved shape. The first yarn hooking portion 55 is formed in a shape cut out perpendicularly rearward from the tip of the projecting portion 54 a of the first yarn guiding portion 54.
[0039]
The second needle bar thread guide 51 is formed so as to extend horizontally rightward from the connecting portion 52. The second needle bar thread guide 51 is a second thread guide portion 58 that guides the upper thread 11 rearward. And a second thread hook 59 that can be threaded by introducing the upper thread 11 guided by the second thread guide 58 and that is open rearward. Note that the second yarn guide portion 58 moves the upper yarn 11 in a direction intersecting the moving direction (left side) of the upper yarn 11 to be hooked and in a direction (rearward) opposite to the direction guided by the first yarn guide portion 54. Will be guided. Here, as shown in FIG. 8, the first yarn guide portion 54 and the second yarn guide portion 58 cross left and right in plan view. Further, the first thread hooking portion 55 is formed in a forward open shape (the front portion is open, the front portion is not closed like a ring, and the forward facing end portion), whereas the second thread hooking portion 59 is formed in a forward direction. Conversely, it is formed in an open rearward shape (the rear is open, not closed like a ring, and the rearward end).
[0040]
That is, as shown in FIG. 9, the second thread hooking portion 59 has a side end 59 a formed continuously to the connecting portion 52 on the right side of the connecting portion 52 and a side end 59 a on the right side of the side end 59 a. And a side end portion 59b formed continuously with the portion 59a. The side end 59a extends toward the right front rather than the left and right direction, and the side end 59b extends toward the right rear than the left and right direction. These side ends 59a and 59b are connected at an obtuse angle (the angle P is greater than 90 degrees and smaller than 180 degrees), and are located forward of the sewing needle 15 immediately below the needle holder 53. The connecting portion (smoothly formed bent portion) of these side end portions 59a and 59b is located to the left and rear of the portion extending in the front-rear direction of the first thread hooking portion 55, and the needle holder 53 Ahead of the front.
[0041]
The side end portion 59b is formed on the left side of the second yarn guide portion 58 so as to be continuous with the second yarn guide portion 58, and the side end portion 59b and the second yarn guide portion 58 form an obtuse angle (the angle Q is (Greater than 180 degrees and smaller than 270 degrees). The side ends 59a and 59b and the second thread guide 58 correspond to the rear end of the second needle bar thread guide 51.
[0042]
The second thread guide portion 58 is located forward of the sewing needle 15, and the right end of the second thread guide portion 58 projects right forward of the right end of the first thread guide portion 54. The connecting portion (smoothly formed apex) between the side end portion 59b and the second yarn guide portion 58 is located behind the connecting portion between the side end portions 59a and 59b, and the first yarn hooking portion 55. It is to the right of the part that extends before and after. Further, a connecting portion between the side end portion 59b and the second yarn guide portion 58 is provided in an area where the first yarn guide portion 54 comes into contact with the yarn portion 11g (the end to be guided: three portions indicated by two-dot chain lines in FIG. 9). Of the arranged thread portions 11g, the second thread portion 11g in the second from the left (the portion of the first thread guide portion 54 indicated by the first thread guide portion 54) is located on the rear side and behind the front surface of the needle holder 53.
[0043]
As shown in FIGS. 8 and 9, the second thread guide portion 58 is formed so as to protrude obliquely right forward and horizontally in the right half of the second needle bar thread guide 51, and to the rear leftward. The upper thread 11 that has moved from right to left is guided rearward by the rear end of the second thread guide 58 that is formed to be inclined. The second thread hooking section 59 is formed in a slightly concave shape at the rear end of the left half of the second needle bar thread guide 51, and the upper thread 11 guided backward by the second thread guide section 58 is the second thread hook section 59. It is hooked on the two thread hooking section 59.
[0044]
Meanwhile, as shown in FIGS. 8 and 9, the second thread guide portion 58 protrudes more horizontally and diagonally forward than the first thread guide portion 54. Therefore, when the upper thread 11 moves from right to left by the thread hooking mechanism 20, first, the upper thread 11 comes into contact with the rear end of the second thread guide portion 58 projecting rightward, and the upper thread 11 Is reliably guided rearward by the second yarn guide portion 58. Further, when the upper thread 11 moves to the left, the upper thread 11 also comes into contact with the first thread guide 54 formed in a curved shape.
[0045]
Then, as shown in FIG. 8, the thread portion 11f in contact with the first thread guide portion 54 is guided forward by the first thread guide portion 54, so that the thread portion 11f passes over the protrusion 54a and the first thread hooking. The upper thread 11 is hung on the portion 55. On the other hand, as shown in FIG. 9, the thread portion 11 g in contact with the second thread guide 58 is guided rearward by the second thread guide 58, and the upper thread 11 is also hooked on the second thread hook 59. Needless to say, in order for the upper thread 11f to be hooked on the first thread hooking section 55 beyond the projecting section 54a of the first thread guide section 54, the position of the projecting section 54a in the left-right direction is required. It is necessary that the upper thread 11 be located on the right side of the leftward movement limit position (the movement limit position of a later-described thread hook 63a that engages with the upper thread 11 and moves leftward).
[0046]
Here, since the first and second thread guides 54 and 58 cross left and right in plan view, the first and second thread guides 54 and 58 cause the first and second thread hooks 55 and 59 to intersect. The upper thread 11 hung on the lip is difficult to come off. Furthermore, since the first and second thread hooks 54 and 59 are formed in an open shape on the opposite sides, the thread portion 11f hooked on the first thread hook 55 becomes the first thread hook 55 The position of the thread is restricted by the second thread hook 59 so that the thread portion 11g hooked to the second thread hook 59 can be removed from the second thread hook 59 by the first thread hook. The position is regulated by the part 55. Therefore, in a state where the upper thread 11 is hooked on the first and second thread hooking portions 54 and 59, the position of the upper thread 11 is restricted to a position near the sewing needle 15, and the upper thread 11 is held along the sewing needle 15. (See FIG. 18). In other words, when the needle bar 12 and the sewing needle 15 move up and down during sewing, the upper thread 11 is regulated so as not to separate from the sewing needle 15 and swing unnecessarily.
[0047]
The first and second needle bar thread guides 50 and 51 are configured to guide the upper thread 11 between the thread cassette 10 and the eye 15a of the sewing needle 15 at the lower end of the needle bar 12. Therefore, in the sewing machine M of the thread cassette mounting type, a case where the yarn path becomes slightly unstable due to a space or the like formed between the thread cassette 10 and the cassette mounting section 5 is assumed, but in such a case, Also, since the upper thread 11 led out from the thread cassette 10 can be reliably guided toward the eye 15a of the sewing needle 15 by the first and second needle bar thread guides 50 and 51, the deflection of the upper thread 11 is minimized. it can.
[0048]
As shown in FIGS. 8, 17, and 18, a groove 12a extending vertically is formed in the lower part of the front side surface of the needle bar 12, and a linear opening is formed in the front surface, and the rear side is formed. It is formed as a recess toward. The groove 12 a of the needle bar 12 is formed from the lowermost end of the needle bar 12 to a portion above the mounting position of the needle bar thread guide 19. Since the groove 12 a is formed to the lowermost end of the needle bar 12, an opening is also formed at the lowermost end of the needle bar 12. The inner surface of the groove 12a is formed flat, and the upper end of the sewing needle 15 is inserted into the groove 12a. That is, the width of the groove 12 a in the left-right direction is larger than the diameter of the sewing needle 15. As shown in FIGS. 17 and 18, a stopper 12b is provided at a predetermined position of the groove 12a for determining the upper limit position (fixed position) of the sewing needle 15 when the upper end of the sewing needle 15 abuts.
[0049]
In addition, a flat surface is formed on the upper end of the sewing needle 15 so that the sewing needle 15 can be attached to the groove 12a of the needle bar 12 in a state where the direction of penetration of the eye 15a of the sewing needle 15 is in the front-rear direction. Only a part is formed. The sewing needle 15 is attached to the groove of the needle bar 12a such that the flat surface contacts the rear inner surface orthogonal to the front-rear direction among the three left, right, and rear inner surfaces of the groove 12a of the needle bar 12. Since these configurations are general, detailed description is omitted.
[0050]
As shown in FIG. 8, the groove 12a of the needle bar 12 is formed as a novel configuration at the front side of the engagement hole 57 through which the lower end of the needle bar 12 passes, and The protrusion 50a projecting rearward is inserted (when attached to the rod 12), and the width of the protrusion 50a in the left-right direction is slightly smaller than the width of the groove 12a of the needle bar 12 in the left-right direction. When the needle bar thread guide 19 is attached to the needle bar 12, the left and right ends of the projection 50a are in contact with the left and right inner surfaces of the groove 12a of the needle bar 12, respectively. The length of the protrusion 50a in the front-rear direction is shorter than the depth of the groove 12a of the needle bar 12 in the front-rear direction, and the uppermost part of the sewing needle 15 is located above the protrusion 50a in the groove 12a of the needle bar 12; The projection 50a is formed such that the upper end of the sewing needle 15 is located behind the projection 50a. That is, the projection 50a functions as a detent when the needle bar thread guide 19 is attached to the needle bar 12.
[0051]
Next, the thread hooking mechanism 20 will be described. As shown in FIGS. 3 and 11 to 18, the thread hooking mechanism 20 is provided with a horizontal plate-shaped base member 60 fixed to a lower portion of the head 4 and slidably provided below the base member 60. A movable member 61, a rotating arm 62 pivotally attached to the lower side of the movable member 61, and a hook member 63 pivotally attached to the lower side of the movable member 61 and having a thread hook 63a at the tip. The thread hook 63a can be swung between a standby position where the upper thread 11 drawn out of the thread cassette 10 is not hooked (see FIGS. 11 and 15) and an operation position where thread hooking is possible (see FIGS. 12 and 16). A hook member 63 interlockingly connected to the moving arm 62, and an operating force applying member 64 for applying an operating force to the hook member 63 for switching the hook member 63 between the standby position and the operating position (FIG. 15, FIG. FIG. 16) and the operation force applying member 64. Operating force transmitting mechanism 65 (see FIGS. 15 and 16) for transmitting the operating force acting on the pivot arm 62 and a.
[0052]
The thread hooking mechanism 20 performs a first swing that switches the hook member 63 from the standby position to the operating position by an operating force applied to the operating force applying member 64 from the thread cassette 10 in conjunction with the mounting operation of the thread cassette 10; The hook member 63 and the rotating arm 62 that have been switched to the operation position are slid together with the movable member 61 to slide the yarn on the thread guide 18 and the needle bar thread guide 19. It is configured to perform a second swing for returning and swinging the hook member 63 to the standby position after the thread hooking.
[0053]
Here, the standby position includes a first standby position (see FIGS. 11 and 15) close to the yarn guide 18 and the needle bar yarn guide 19 before the yarn cassette 10 is mounted, and a standby state where the yarn cassette 10 is mounted. Two standby positions including a second standby position (see FIGS. 14 and 18) farther from the thread guide 18 and the needle bar thread guide 19 than the first standby position are included.
[0054]
The base member 60 is attached to a frame member 70 constituting a part of the thread tension mechanism 14 in a state of being suspended downward by two support members 71 and 72 (see FIG. 15). A stopper member 73 that receives and stops the rotating arm 62 that moves leftward during the sliding movement is formed integrally at the middle part in the left-right direction of the base member 60 so as to protrude downward.
[0055]
The movable member 61 is formed of a member having a substantially rectangular shape and a horizontal plate shape in plan view, and is attached to the base member 60 by two pin members 74 and 75 so as to be slidable in the left-right direction. The movable member 61 is formed with a guide groove 61 a that engages with the two pin members 74 and 75 and guides the slide movement with respect to the base member 60 so as to extend in the left-right direction.
[0056]
That is, the movable member 61 starts from a state in which the left pin member 74 is located at the left end position of the guide groove 61a (see FIG. 11) until the right pin member 75 reaches the right end of the guide groove 61a (see FIG. 14). Is slidably attached to the base member 60 for a predetermined distance. A slit 61b parallel to the guide groove 61a is formed on the rear side of the guide groove 61a. The movable member 61 elastically biases the movable member 61 rightward (the threading start end position in FIG. 11). The return coil spring 76 is mounted.
[0057]
The base end of the rotating arm 62 is pivotally connected to a front portion of the right end of the movable member 61 via a pin 77 (see FIG. 15). A torsion spring 78 (see FIG. 15) that elastically urges in the surrounding direction (the direction in which the hook member 63 becomes the standby position) is attached. An operation force input portion 62 a to which an operation force for switching the hook member 63 by the operation force transmission mechanism 65 is input is formed on a right side portion of the center portion of the rotating arm 62 in the front-rear direction. A contact portion 62b that contacts the stopper member 73 when the rotating arm 62 slides leftward by a predetermined distance integrally with the movable member 61, as described later, is provided on the left side of the distal end of the rotating arm 62. It is formed in a horizontally projecting shape.
[0058]
The proximal end of the hook member 63 is pivotally connected to the movable member 61 via a pin 79, and the distal end of the rotating arm 62 and the vicinity of the proximal end of the hook member 63 are interlocked and connected by an interlocking mechanism 80 described below. ing. Accordingly, the base end of the hook member 63 and the base end of the turning arm 62 are both pivotally attached to the movable member 61, and the positional relationship between the base end of the hook member 63 and the base end of the turning arm 62 is determined. It is kept constant. The interlocking mechanism 80 is provided so as to protrude downward at a notch 62 c formed at the distal end of the rotating arm 62 and at a portion behind the pin 79 near the base end of the hook member 63. And a pin 81 that engages with the notch 62c.
[0059]
In the state where the hook member 63 is at the first standby position shown in FIGS. 11 and 15, the thread hook 63 a of the hook member 63 is separated from the upper thread 11, but from this state, shown in FIGS. 12 and 16. As described above, the rotating arm 62 rotates the predetermined angle θ about the pin 77 in the clockwise direction in FIG. 12 against the urging force of the torsion spring 78. 1 (For example, θ 1 (20 °), the notch 62c is also rotated by the angle θ. 1 Only rotate. At this time, the pin 81 is rotated about the pin 79 by the notch 62c.
[0060]
Here, since the distance between the pin 77, which is the center of rotation of the rotating arm 62, and the pin 81 is larger than the distance between the pins 79, 81, the rotation of the pin 81 causes the hook member 63 to swing in a horizontal state. When the pin 81 is moved, the rotation of the pin 81 is enlarged, and the thread hook 63a is rotated about the pin 79 in the clockwise direction in FIG. 2 (For example, θ 2 (≒ 90 °) swings in a horizontal state, the hook member 63 reaches the operation position shown in FIGS. 12 and 16, and the thread hook 63 a engages with the upper thread 11. However, the hook member 63 is located below the rotating arm 62 and the movable member 61. The hook member 63 is integrally formed with a protruding portion (not shown) projecting upward. The protrusion also rotates integrally. The movable member 61 partially projects on the rotation path of the protrusion, and the hook member 63 is set at a predetermined angle θ. 2 When the hook member 63 is only rotated, the projecting portion of the hook member 63 and the protruding portion (not shown) of the movable member 61 are engaged, so that the hook member 63 cannot further rotate.
[0061]
As shown in FIGS. 15 to 18, the operating force applying member 64 is pivotally attached to the frame member 70 of the thread tension mechanism 14 so as to be swingable. A cassette contact portion 64a with which the lower end of the thread cassette 10 contacts is provided at the tip side (right end side) of the operation force applying member 64 so as to protrude forward. When the yarn cassette 10 is mounted, an operating force for switching the hook member 63 between the standby position and the operation position is transmitted from the yarn cassette 10 to the cassette contact portion 64a in conjunction with the mounting operation of the yarn cassette 10. The operating force applying member 64 swings clockwise in FIG.
[0062]
The operation force transmission mechanism 65 includes a link member 85 pivotally connected to a lower end portion of the operation force applying member 64 at an intermediate 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 85. The formed distal arm 85a, a driven pin 86 provided at the base end (left end) of the link member 85, and a cam plate 87 having an arcuate cam groove 87a with which the driven pin 86 engages. Have.
[0063]
The link member 85 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 64a from the thread cassette 10, and the operating force adding member 64 is moved clockwise in FIG. , The link member 85 moves to the left along with the swing. Here, as described above, the movable member 61 is biased rightward by the coil spring 76, and the pivot arm 62 is pivotally attached to the movable member 61. In this state, the operation force input section 62a is constantly in contact with the operation force input section 62a.
[0064]
That is, the operating force is transmitted to the operating force input portion 62 a of the rotating arm 62 via the link member 85 extending in the left-right direction, but the base end of the link member 85 is connected to the cam groove of the cam plate 87 via the driven pin 86. When the lower end portion of the operating force applying member 64 moves in an arc shape, the driven pin 86 moves along the arc of the cam groove 87a substantially coinciding with the arc, and the entire link member 85 is moved. It can move smoothly in the left and right direction. That is, the link member 85 does not rotate with a rotation center at a part of the link member 85. Accordingly, the distal arm 85a presses the operating force input portion 62a of the rotating arm 62 substantially horizontally to the left, and the occurrence of sliding friction between the distal arm 85a and the operating force input portion 62a is reduced. It can be suppressed as much as possible.
[0065]
Next, the thread hooking operation by the thread hooking mechanism 20 will be described. In a state before the thread cassette 10 is mounted, as shown in FIGS. 11 and 15, the hook member 63 is at a first standby position where the upper thread 11 is not hooked on the thread hook 63a. When the thread cassette 10 is pushed into the cassette mounting portion 5 from this state, the lower end of the cassette main body 30 of the thread cassette 10 abuts on the cassette contact portion 64a, and an operating force is applied from the thread cassette 10 to the cassette contact portion 64a. As a result, the cassette contact portion 64a swings clockwise in FIG.
[0066]
At this time, when the operating force is transmitted from the operating force applying member 64 to the operating force input portion 62a of the rotating arm 62 via the distal arm portion 85a of the link member 85 by the operating force transmitting mechanism 65, the rotating arm 62 At a predetermined angle θ 1 A first swing is performed to rotate the hook member 63 from the standby position to the operation position while rotating the hook member 63 only by the rotation.
[0067]
In other words, the operating force input from the distal arm 85a to the operating force input unit 62a causes the rotating arm 62 to rotate the pin 77 as the rotation center by a predetermined angle θ in the clockwise direction in FIG. 1 The rotation of the hook member 63, which is driven only by rotation, and the interlocking connection with the rotation arm 62, the interlocking mechanism 80 also rotates the pin 79 as the rotation center between the thread guide 18 and the needle bar thread guide 19 clockwise in FIG. , The thread hook 63a is set at a predetermined angle θ as shown in FIG. 2 The thread hook 63a is turned to the operating position by just rotating, and the thread hook 63a is engaged with the upper thread 11. Here, the operation position of the hook member 63 shown in FIG. 12 is configured to be located on the right side of the first standby position shown in FIG. 11 so that the upper thread 11 is securely hooked on the thread hook 63a. ing. Note that, with the rotation of the rotation arm 62, the contact portion 62b formed at the distal end of the rotation arm 62 projects to the left.
[0068]
When the operating force is further transmitted to the rotating arm 62 after the first swing, the rotating arm 62 is engaged with the projecting portion of the movable member 61 and the projecting portion of the hook member 63 so that the rotating arm 62 has a predetermined angle θ. 1 As shown in FIGS. 13 and 17, the hook member 63 and the rotating arm 62 that have been switched to the operating positions are opposed to the movable member 61 against the urging force of the coil spring 76, as shown in FIGS. Thus, the slider 62 slides leftward by a predetermined distance until the contact portion 62b contacts the stopper member 73. During this sliding movement, the upper thread 11 engaged with the thread hook 63 a is pulled to the left together with the hook member 63, and the first and second thread hooks 18 a of the thread guide 18 and the first and second needle bar thread guides 19 are provided. The upper thread 11 is hooked on the two thread hooks 55 and 59.
[0069]
As shown in FIGS. 13 and 17, a state in which the contact portion 62b contacts the stopper member 73 and the pin 81 cannot move leftward (a part of the rotating arm 62 with respect to the movable member 61). When the yarn cassette 10 is further pushed in and the operation force is input to the operation force input portion 62a in a state where the hook member 63 is temporarily stopped, the second swing for returning and swinging the hook member 63 to the second standby position is performed. Done. That is, the movable member 61 moves leftward with respect to the base member 60 until the right pin member 75 engages with the right end of the guide groove 61a. The arm 62 rotates in the counterclockwise direction in FIG. 14 around the pin 81, and the interlocking mechanism 80 also swings the hook member 63 in the counterclockwise direction in FIG. The hook member 63 is switched to the second standby position.
[0070]
With the rotation of the rotating arm 62, the contact portion 62b slides with respect to the stopper member 73. At this time, the engagement of the upper thread 11 with the thread hook 63a is released, the upper thread 11 comes off the thread hook 63a, and the operation of hooking the thread guide 18 and the needle bar thread guide 19 is completed.
[0071]
Next, a series of operations of the sewing machine M when the thread cassette 10 is mounted will be described focusing on a thread hooking operation to the needle bar thread guide 19 by the thread hooking mechanism 20. When the thread cassette 10 is inserted from above into the upper part of the cassette mounting section 5 and pushed in, the upper thread 11 extending from the balance 13 to the downstream side is interlocked with the mounting operation of the thread cassette 10, and the sewing needle 15 is moved by the thread holding mechanism 17. After being held in the vicinity of the eye 15a, the thread is passed through the eye 15a by the threading mechanism 16.
[0072]
As described above, when the thread cassette 10 is further pushed into the cassette mounting portion 5 in a state where the upper thread 11 held by the thread holding mechanism 17 is passed through the eye 15a by the threading mechanism 16, the thread hooking mechanism 20 Thereby, the upper thread 11 is hung on the thread guide 18 and the needle bar thread guide 19. That is, as shown in FIGS. 11 and 15, the thread cassette 10 is pushed into the cassette mounting portion 5 from the state where the hook member 63 is at the first standby position where the upper thread 11 is not hooked on the thread hook 63a. Then, the lower end of the cassette main body 30 comes into contact with the cassette contact portion 64a of the operation force applying member 64, and the operation force acts on the cassette contact portion 64a from the thread cassette 10.
[0073]
When the operating force applied to the operating force applying member 64 is transmitted to the operating force input unit 62a of the rotating arm 62 by the operating force transmitting mechanism 65, first, via the interlocking mechanism 80, as shown in FIGS. As shown in the figure, a first swing for switching the hook member 63 from the first standby position to the operating position is performed, and the upper thread 11 is engaged with the thread hook 63a. Next, as shown in FIGS. 13 and 17, a sliding movement is performed in which the hook member 63 and the rotating arm 62, which have been switched to the operation positions, slide together with the movable member 61.
[0074]
When the upper thread 11 linearly moves from right to left by moving the hook member 63 to the left in this way, first, as shown in FIG. 8, the upper thread 11 protrudes to the right. The upper thread 11 is guided rearward by the second thread guide 58 in contact with the rear end of the second thread guide 58. Further, when the upper thread 11 moves to the left, the upper thread 11 also comes into contact with the first thread guide 54 formed in a curved shape.
[0075]
Then, the upper thread portion 11f that comes into contact with the first thread guide portion 54 is guided forward by the first thread guide portion 54, and the upper thread 11 is hooked on the first thread hook portion 55. On the other hand, as shown in FIG. 9, the upper thread portion 11 g contacting the second thread guide portion 58 is guided rearward by the second thread guide portion 58, and the upper thread 11 is also threaded on the second thread hook portion 59. Is done.
[0076]
Here, as shown in FIG. 8, since the first yarn guide portion 54 and the second yarn guide portion 58 cross left and right in plan view, the first and second yarn guide portions 54 and 58 cause the upper yarn 11 does not easily come off from the first and second thread hooking portions 55 and 59. Furthermore, since the first and second thread hooks 55 and 59 are formed in an open shape on opposite sides, the upper thread portion 11f hooked on the first thread hook 55 is connected to the first thread hook 55. The upper thread portion 11g hooked on the second thread hooking section 59 is restricted by the second thread hooking section 59 so as not to fall out of the first thread hooking section 55. It is regulated by the hanging portion 55. Therefore, in a state where the upper thread 11 is hooked on the first and second thread hooking portions 55 and 59, the position of the upper thread 11 is restricted to a position near the sewing needle 15, and the upper thread 11 is held along the sewing needle 15. .
[0077]
From this state, as shown in FIGS. 14 and 18, a second swing is performed to swing the hook member 63 back to the second standby position, and the upper thread 11 comes off from the thread hook 63a. The hanging operation is completed.
[0078]
According to the sewing machine M described above, the following effects can be obtained.
[0079]
1) First and second thread guides 54 and 58 for guiding the upper thread 11 forward and backward, respectively, cross each other in plan view, and further, first and second thread hooks 55 and 59 respectively. Since the upper thread 11 is formed open frontward and rearward, the upper thread 11 hooked to the first and second thread hooking portions 55 and 59 which are open to the outside hardly comes off. Further, the state in which the position of the upper thread 11 is restricted to a position near the sewing needle 15 is maintained by the first and second thread hooking portions 55 and 59, so that the upper thread 11 is moved near the lower end of the needle bar 12 during sewing. It is possible to reliably prevent unnecessary swinging.
[0080]
2) Since the first thread guide 54 is formed in a curved shape, when the upper thread 11 is moved leftward by the thread hooking mechanism 20, the first thread guide 54 smoothly moves the upper thread 11 forward. And the upper thread 11 can be reliably introduced into the first thread hooking section 55.
[0081]
3) Since the second thread guide portion 58 is formed so as to project horizontally and diagonally forward to the right from the first thread guide portion 54, the upper thread 11 moves from right to left by the thread hooking mechanism 20. At this time, the upper thread 11 reliably contacts the rear end of the second thread guide section 58, and the upper thread 11 is guided rearward by the second thread guide section 58. Further, when the upper thread 11 moves to the left, the upper thread 11 also comes into contact with the curved first thread guide section 54, and the upper thread 11 is guided forward by the first thread guide section 54. That is, both the first and second thread guides 54 and 58 can reliably guide the upper thread 11 to the first and second thread hooks 55 and 59.
[0082]
4) The first and second needle bar thread guides 50 and 51 are configured to guide the upper thread 11 between the thread cassette 10 and the eye 15a of the sewing needle 15 at the lower end of the needle bar 12. In the thread cassette-attached sewing machine M, the thread path may be slightly unstable due to a space formed between the thread cassette 10 and the cassette attaching section 5, and the like. Since the upper thread 11 led out of the thread cassette 10 can be reliably guided by the first and second needle bar thread guides 50 and 51 toward the eye hole 15a of the sewing needle 15, the deflection of the upper thread 11 can be prevented as much as possible. .
[0083]
5) Since the first and second needle bar thread guides 50 and 51 are integrally formed of a metal plate, the needle bar thread guide 19 can be easily attached to the head 4 and a troublesome adjustment operation at the time of attachment is also possible. It becomes unnecessary.
[0084]
6) Only by moving the upper thread 11 linearly to the left by the thread hooking mechanism 20, the upper thread 11 is moved to the first and second thread hooking sections 55, 59 by the first and second thread guides 54, 58. Since the upper thread 11 is guided and the first thread 11 is hooked on the first and second thread hooking portions 55 and 59, the thread hooking operation on the needle bar thread guide 19 is facilitated.
[0085]
Next, modified embodiments in which various modifications are made to the above-described embodiment will be described. However, the same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0086]
1] In the above-described embodiment, the present invention is applied to the sewing machine configured to automatically thread the upper thread 11 on the needle bar thread guide 19 in conjunction with the mounting operation of the thread cassette 10; The present invention can also be applied to a sewing machine configured to directly hang the upper thread 11 on the needle bar thread guide 19. Even in this case, the needle thread 11 can be hooked on the needle bar thread guide 19 simply by moving the needle thread 11 linearly in a predetermined direction by hand, so that the thread hooking operation becomes easy.
[0087]
2] In the above embodiment, the needle thread 11 is passed through the eye hole 15a of the sewing needle 15 by the threading mechanism 16, and then the needle thread 11 is hooked on the needle bar thread guide 19. The upper thread 11 may be hooked on the needle bar thread guide 19 before or simultaneously with the threading operation to the hole 15a.
[0088]
3] The shape of the right end of the first thread guide portion 54 is not limited to the curved shape as in the above-described embodiment. As shown in FIG. 19, in the first needle bar thread guide 50A, the upper thread 11 is moved leftward. The first thread guide 54A may be formed linearly within a range in which the upper thread 11 can be hooked on the first thread hook 55 by being moved linearly. Also, the shape of the first thread hooking section 55 is not limited to a right angle shape as in the above embodiment, and as shown in FIG. As long as the upper thread 11 does not come off from the portion 59, the first thread hooking portion 55B may be formed in a curved shape as shown by a solid line or a chain line.
[0089]
4] In the above embodiment, the needle bar 12 is provided with the needle bar thread guide 19 formed of a metal plate separate from the needle bar 12, but the needle bar thread guide is mounted on the needle bar via the needle holder. Alternatively, the needle bar thread guide may be provided integrally with the needle bar or the needle holder. Further, the first and second needle bar thread guides may be integrally formed of a member of another material such as a synthetic resin.
[0090]
5] In the above-described embodiment, both the first needle bar thread guide 50 and the second needle bar thread guide 51 are simply horizontal and flat ends of the plate, and the first needle bar thread guide 50 and the second needle bar Although the upper thread 11 is prevented from coming off from the thread guide 51, a portion for preventing the thread from coming off may be further added if necessary, as long as the thread hooking is not hindered. Specifically, as shown in FIGS. 21 to 24, a projecting portion 100 projecting downward from the left end portion of the first thread guide portion 54, a first needle bar thread guide 50 </ b> C, and a second needle A horizontal extension portion 200 extending in the horizontal direction (rightward) from the front end of the connecting portion 25C between the vertical direction with the bar thread guide 51, and the protrusion 100 and the horizontal extension portion 200 are the first needle. The thread portion 11h extending between the first thread catching portion 55 of the bar thread guide 50C and the second thread catching portion 59 of the second needle bar thread guide 51 is disposed so as to be in contact therewith. As shown in FIG. 24, the thread portion 11f hooked on the first thread hook 55 of the first needle bar thread guide 50C is hooked on the second thread hook 59 of the second needle bar thread guide 51. The thread portion 11h is located forward of the thread portion 11g and extends between the thread portion 11f and the thread portion 11g at an angle. The projecting portion 100 is located to the right of the slanted thread portion 11h, and the horizontal extension portion 200 is located below and forward of the slanted thread portion 11h.
[0091]
Therefore, for example, even if the thread portion 11h becomes slack due to the vertical swing of the balance 13 during sewing, the projecting portion 100 and the horizontal extending portion 200 move the thread portion 11h rightward (to the first thread hooking portion 55 or the second thread portion). The movement in the direction in which the thread hooking portion 59 is opened), the vertical direction, and the front-back direction are restricted, so that the upper thread 11 hardly comes off from the first thread hooking portion 55 and the second thread hooking portion 59.
[0092]
Only one of the protruding portion 100 and the horizontal extension portion 200 may be provided. Further, the thread portion 11h may be configured to always contact the protruding portion 100 or the horizontal extension portion 200, or the thread portion 11h may be protruded only when the thread portion 11h largely moves in a predetermined direction. 100 or the horizontal extension unit 200 may be temporarily contacted. Furthermore, the above-mentioned horizontal extending portion 200 is provided between the first thread hooking section 55 of the first needle bar thread guide 50C and the second thread hooking section 59 of the second needle bar thread guide 51. Although the movement in the direction and the front-rear direction is restricted, the horizontal extension portion 200 may be configured to restrict the movement of the thread portion 11h in only one of the vertical direction and the front-rear direction. The modifications described above (FIGS. 21 to 24) are examples in which the inventions of claims 8 to 11 are applied.
[0093]
6] As shown in FIGS. 25 to 28, the first thread hooking portion 55D of the first needle bar thread guide 50D has a guide hole 110 for guiding the upper thread 11 at the time of sewing, and a lateral direction more than the guide hole 110. The opening may be configured such that the first thread guide portion 54D is located closer to the sewing needle 15 than the guide hole 110. That is, the first needle bar thread guide 50 </ b> D is integrally connected to the mounting plate portion 56 and is located at the rear, and the horizontal plate portion 112 protrudes further horizontally forward from the horizontal plate portion 112 and is located at the front. And On the right side of the horizontal plate portion 112, a first thread guide portion 54D for guiding the upper thread 11 moving from right to left forward is formed in a curved shape.
[0094]
On the other hand, a guide hole 110 is formed at a substantially central portion in the left-right direction of the protruding plate portion 113, and the guide hole 110 is located forward of the second thread hooking portion 59 of the second needle bar thread guide 51 (with the sewing needle 15). Opposite side). The guide hole 110 is formed in a long hole shape that extends long in the front-rear direction crossing the moving direction (left-right direction) of the upper thread 11 hooked on the second thread hooking section 59. Further, the first thread guide portion 54D is located closer to the sewing needle 15 (rearward) than the guide hole 110, and is horizontally horizontally to the left at the rear end (end of the sewing needle 15) of the guide hole 110. A protruding projection 114 is formed. The protrusion 114 forms an opening 111 at the rear end of the guide hole 110, which is narrower in the left-right direction than the guide hole 110 and communicates the guide hole 110 with the outside. Further, the opening 111 extends in the front-rear direction, and a portion of the rear end of the guide hole 110 facing the protrusion 114 from the left is smoothly connected to the terminal end (left end) of the first thread guide 54D. Have been.
[0095]
A guide portion 115 that curves backward from right to left is formed on the right side of the protruding plate portion 113, and a gap between the first thread guide portion 54D and the guide portion 115, the width of which in the front-rear direction decreases toward the left. 116 are formed. The gap 116 communicates with the guide hole 110 via the opening 111, and the guide hole 110 is opened rearward at the rear end.
[0096]
When the upper thread 11 moves from the right side with respect to the needle bar thread guide 19D provided with the first needle bar thread guide 50D, first, the upper thread 11 is moved to the second position of the second needle bar thread guide 51. The abutting thread portion 11 g is brought into contact with the thread guide portion 58, and the contacted thread portion 11 g is guided rearward by the second thread guide portion 58. Then, the thread portion 11f above the thread portion 11g is guided forward by the first thread guide portion 54D. At this time, the yarn portion 11f is guided to the gap 116 between the first yarn guide portion 54D and the guide portion 115, and when the yarn portion 11f reaches the end of the first yarn guide portion 54D, the yarn is released by the opening portion 111. The portion 11f is guided forward in a direction intersecting the moving direction of the upper thread 11, and is guided into the guide hole 110. At the same time, the yarn portion 11g is hooked on the second hook portion 59 in the same manner as in the above embodiment.
[0097]
Here, since the second thread hooking portion 59 is located closer to the sewing needle 15 than the guide hole 110, the thread portion 11 f guided into the guide hole 110 is attracted rearward and engages with the front portion of the protrusion 114. Then, as shown in FIG. 28, the thread portion 11h between the thread portion 11f and the thread portion 11g is threaded in a state of being inclined rearward, and the threading on the needle bar thread guide 19D is completed. Here, since the guide hole 110 is formed so as to extend in the front-rear direction, an appropriate play is obtained in the thread portion 11f in the guide hole 110 during sewing. The modifications described above (FIGS. 25 to 28) are examples in which the inventions of claims 11 to 13 and 15 are applied.
[0098]
7] As shown in FIGS. 29 to 32, the first thread hooking portion 55E of the first needle bar thread guide 50E guides the upper thread 11 at the time of sewing, and the front and rear direction with respect to the guide hole 120. The guide hole 120 is narrower and has an opening portion 121 for communicating the guide hole 120 with the outside thereof, and the guide hole 120 may be located closer to the sewing needle 15 than the end of the first thread guide portion 54E. Good. That is, in the first needle bar thread guide 50E, a guide hole 120 is formed behind the front end of the first thread guide portion 54E, and the guide hole 120 is formed in the second thread hooking portion of the second needle bar thread guide 51. It is located ahead of 59 (on the side opposite to the sewing needle 15). The guide hole 120 is formed in a long hole shape that extends long in the front-rear direction crossing the moving direction of the upper thread 11 hooked on the second thread hooking section 59.
[0099]
A pair of front and rear protrusions 122 and 123 projecting forward and rearward, respectively, are formed at the left end of the guide hole 120, and the left end of the rear portion of the guide hole 120 is more than the rear protrusion 123. It is formed so as to enter to the left. An opening 121 is formed between the pair of front and rear protrusions 122 and 123, and has a width in the front-rear direction smaller than that of the guide hole 120 and communicates the guide hole 120 with the outside. The opening 121 extends in the left-right direction, and the opening 121 opens the guide hole 120 to the left. A guide portion 124 is formed on the rear side of the left end portion of the first yarn guide portion 54E so as to be inclined rearward from the left and connected to the front protrusion 122 to guide the upper thread 11 to the guide hole 120. I have.
[0100]
When the upper thread 11 moves from the right side with respect to the needle bar thread guide 19E provided with the first needle bar thread guide 50E, first, the upper thread 11 is moved to the second position of the second needle bar thread guide 51. The abutting thread portion 11 g is brought into contact with the thread guide portion 58, and the contacted thread portion 11 g is guided rearward by the second thread guide portion 58. Next, the thread portion 11f above the thread portion 11g is guided forward by the first thread guide portion 54E. Then, when the thread portion 11f reaches the left end of the first thread guide portion 54E, the thread portion 11f moves rightward and backward from the left end of the first thread guide portion 54E while being guided by the guide portion 124, and 11 f is guided to the guide hole 120 from the left through the opening 121. At the same time, the yarn portion 11g is hooked on the second hook portion 59 in the same manner as in the above embodiment.
[0101]
Here, since the second thread hooking portion 59 is located closer to the sewing needle 15 than the guide hole 120, the thread portion 11 f guided into the guide hole 120 is attracted rearward, and the rear end of the guide hole 120. 32, the thread portion 11h between the thread portion 11f and the thread portion 11g is hooked in a state in which the thread portion 11h is inclined backward, and the thread is guided to the needle bar thread guide 19E, as shown in FIG. The hanging is completed. Here, since the guide hole 120 is formed so as to extend in the front-rear direction, an appropriate play is obtained in the thread portion 11f in the guide hole 120 during sewing. The above-described modifications (FIGS. 29 to 32) are examples in which the inventions of claims 11, 12, 14, and 15 are applied.
[0102]
According to the first aspect of the present invention, the first and second yarn guiding portions for guiding the upper yarn in the direction intersecting with the moving direction of the upper yarn are configured to cross each other in plan view. Therefore, the first and second thread guides make it difficult for the upper thread to come off from the first and second thread hooks formed to be open to the outside.
[0103]
According to the second aspect of the invention, in one of the first and second thread hooks, the other thread hook is regulated so that the upper thread does not come off from the one thread hook, and the first and second thread hooks are restricted. Since the state where the position of the upper thread is regulated at the position near the sewing needle by the hook portion is maintained, it is possible to prevent the upper thread from unnecessarily swinging near the lower end of the needle bar during sewing.
[0104]
According to the third aspect of the present invention, since the first yarn guide is formed in a curved shape or a straight shape, when the upper thread is moved in a predetermined moving direction by the yarn hooking mechanism, the first yarn guide is formed. Thereby, the upper thread can be reliably guided in the direction intersecting the predetermined moving direction, and the upper thread can be introduced into the first thread hooking section.
[0105]
According to the fourth aspect of the present invention, the second yarn guide is formed so as to protrude outward in the horizontal direction from the first yarn guide, so that the upper thread to be hooked first becomes the second yarn guide. And the upper thread is guided by the second thread guide so as to also contact the first thread guide, so that both the first and second thread guides reliably assure the upper thread. It can guide up to two thread hooks.
[0106]
According to the fifth aspect of the present invention, in the thread cassette-attached sewing machine, even when the thread path may become slightly unstable due to a space formed between the thread cassette and the cassette attaching portion, the thread cassette can be used. Since the upper thread derived from the thread supply source can be reliably guided toward the eye of the sewing needle by the first and second needle bar thread guides, the upper thread is prevented from unnecessarily swinging near the lower end of the needle bar. it can.
[0107]
According to the sixth aspect of the present invention, since the first and second needle bar thread guides are formed integrally with the metal plate, the needle bar thread guide can be easily attached to the lower end of the needle bar.
[0108]
According to the seventh aspect of the present invention, the upper thread is guided by the first and second thread guides to the first and second thread hooks simply by moving the upper thread linearly in the predetermined movement direction. Since the upper thread is threaded on the first and second threading portions, the threading operation on the needle bar thread guide is facilitated.
[0109]
According to the eighth aspect of the present invention, since the horizontal movement of the upper thread is regulated by the projecting portion, the upper thread is less likely to come off from the first needle bar thread guide and the second needle bar thread guide.
[0110]
According to the ninth aspect of the invention, at least one of the movement of the upper thread in the up-down direction or the front-rear direction is regulated by the horizontal extending portion, so that the upper thread can be moved from the first needle bar thread guide or the second needle bar thread guide. Is hard to come off.
[0111]
According to the tenth aspect, the horizontal movement of the upper thread and the movement of the upper thread in at least one of the up-down direction and the front-rear direction are regulated by the protruding portion and the horizontal extending portion. The upper thread does not easily come off from the thread guide or the second needle bar thread guide.
[0112]
According to the eleventh aspect of the present invention, when the upper thread moves in a predetermined direction during the threading, the upper thread is introduced into the guide hole through the opening that is narrower than the guide hole. Is difficult to come off from the guide hole, and the upper thread is less likely to come off from the first needle bar thread guide and the second needle bar thread guide.
[0113]
According to the twelfth aspect of the invention, since the guide hole is formed so as to extend in a direction intersecting with the moving direction of the upper thread hooked on the second thread hooking portion, the upper thread is moved in a predetermined direction. When the needle thread is moved and guided into the guide hole, an appropriate play is obtained for the upper thread in the guide hole.
[0114]
According to the thirteenth aspect, after the upper thread is guided by the first thread guide in the direction intersecting the moving direction of the upper thread, the upper thread moves in a direction away from the sewing needle from the sewing needle side end of the guide hole. Since the upper thread is guided into the guide hole, the upper thread hardly comes off from the guide hole.
[0115]
According to the invention of claim 14, after the upper thread is guided by the first thread guide in a direction intersecting the moving direction of the upper thread, the upper thread moves from the terminal end of the first thread guide to the sewing needle side, Since the upper thread is guided into the guide hole, it is difficult for the upper thread to come off from the guide hole.
[0116]
According to the invention of claim 15, in a state where the upper thread is guided by the guide hole of the first thread hook portion, the upper thread is also hooked on the second thread hook portion located on the sewing needle side of the guide hole. The upper thread is less likely to come off from the first and second needle bar thread guides.
[0117]
According to the sixteenth aspect, substantially the same effects as those of the first aspect can be obtained, and the description thereof is omitted.
[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 side view of a main part of the head immediately after the threading operation.
FIG. 5 is a front view of the thread cassette.
FIG. 6 is a left side view of the yarn cassette.
FIG. 7 is a bottom view of the thread cassette.
FIG. 8 is a plan view of a needle bar thread guide.
FIG. 9 is a bottom view of FIG.
FIG. 10 is a front view of FIG. 8;
FIG. 11 is a bottom view of the thread hooking mechanism (immediately before the thread hooking operation).
FIG. 12 is a bottom view of the thread hooking mechanism (after the first swing).
FIG. 13 is a bottom view of the thread hooking mechanism (after sliding movement).
FIG. 14 is a bottom view of the thread hooking mechanism (after the second swing).
FIG. 15 is a front view of FIG. 11;
FIG. 16 is a front view of FIG.
FIG. 17 is a front view of FIG.
FIG. 18 is a front view of FIG.
FIG. 19 is a plan view of a modified needle bar thread guide.
FIG. 20 is a bottom view of a modified needle bar thread guide.
FIG. 21 is a plan view of a modified needle bar thread guide.
FIG. 22 is a bottom view of a modified needle bar thread guide.
FIG. 23 is a front view of a modified needle bar thread guide.
FIG. 24 is a right side view of a modified needle bar thread guide.
FIG. 25 is a plan view of a modified needle bar thread guide.
FIG. 26 is a bottom view of a needle bar thread guide according to a modified embodiment.
FIG. 27 is a front view of a needle bar thread guide of a modified embodiment.
FIG. 28 is a right side view of a needle bar thread guide according to a modified embodiment.
FIG. 29 is a plan view of a modified needle bar thread guide.
FIG. 30 is a bottom view of a needle bar thread guide according to a modified embodiment.
FIG. 31 is a front view of a needle bar thread guide of a modified embodiment.
FIG. 32 is a right side view of a needle bar thread guide according to a modified embodiment.
[Explanation of symbols]
M sewing machine
4 head
5 Cassette mounting section
10 yarn cassette
11 Upper thread
12 Needle bar
15 sewing needle
15a Eye hole
19, 19D, 19E Needle bar thread guide
20 Threading mechanism
50, 50A, 50B, 50C, 50D, 50E First needle bar thread guide
51 2nd needle bar thread guide
54, 54A, 54D, 54E First thread guide
55, 55B, 55D, 55E First threading section
58 Second yarn guide
59 2nd thread hook
100 protrusion
200 Horizontal Extension
110, 120 Guide hole
111, 121 Open part

Claims (16)

ミシン頭部に上下動自在に配設された針棒に付設され縫針の目孔へ向かう上糸を案内する針棒糸案内を備えたミシンにおいて、
前記針棒糸案内は、前記針棒の下端部に設けられた第１の針棒糸案内と、この第１の針棒糸案内の下側に所定間隔空けて前記針棒の下端部に設けられた第２の針棒糸案内とを備え、
前記第１の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第１糸案内部と、この第１糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第１糸掛け部とを備え、
前記第２の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第２糸案内部と、この第２糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第２糸掛け部とを備え、
前記第１，第２糸案内部が平面視で互いに交差するように構成されたことを特徴とするミシン。In a sewing machine provided with a needle bar thread guide attached to a needle bar movably arranged on the sewing machine head and guiding an upper thread toward an eye hole of a sewing needle,
The needle bar thread guide is provided at a lower end of the needle bar at a predetermined interval below a first needle bar thread guide provided at a lower end portion of the needle bar. Provided with a second needle bar thread guide,
The first needle bar thread guide introduces a first thread guide that guides the upper thread in a direction intersecting with the moving direction of the upper thread to be threaded, and an upper thread guided by the first thread guide. And a first threading portion which is open to the outside and can be threaded,
The second needle bar thread guide introduces a second thread guide section for guiding the upper thread in a direction intersecting with the moving direction of the upper thread to be threaded, and the upper thread guided by the second thread guide section. And a second threading portion that is open to the outside and can be threaded.
A sewing machine, wherein the first and second thread guides are configured to intersect each other in a plan view. 前記第１，第２糸掛け部は、互いに反対側に開放状に形成され、前記第１，第２糸掛け部により上糸を縫針の近傍位置に位置規制するように構成したことを特徴とする請求項１に記載のミシン。The first and second thread hooks are formed in an open shape on opposite sides, and are configured to regulate the position of the upper thread to a position near the sewing needle by the first and second thread hooks. The sewing machine according to claim 1, wherein 前記上糸を所定の移動方向に移動させて前記第１、第２糸掛け部に糸掛けする糸掛け機構を設け、前記第１糸案内部は、曲線状又は直線状に形成されたことを特徴とする請求項１又は２に記載のミシン。A thread hooking mechanism is provided for moving the upper thread in a predetermined moving direction and hooking the first and second thread hooking sections, wherein the first thread guide section is formed in a curved or straight line. The sewing machine according to claim 1, wherein the sewing machine is a sewing machine. 前記第２糸案内部は、第１糸案内部よりも水平方向外側へ突出状に形成されたことを特徴とする請求項１〜３の何れかに記載のミシン。The sewing machine according to any one of claims 1 to 3, wherein the second thread guide is formed so as to protrude outward in the horizontal direction from the first thread guide. 前記ミシン頭部は、糸供給源を有する糸カセットを装着する為のカセット装着部を備え、
前記第１，第２針棒糸案内は、前記糸カセットと縫針の目孔との間の上糸を案内するように構成されたことを特徴とする請求項１〜４の何れかに記載のミシン。The sewing machine head includes a cassette mounting unit for mounting a yarn cassette having a yarn supply source,
The said 1st, 2nd needle bar thread guide was comprised so that the upper thread between the said thread cassette and the eye of the sewing needle may be guide | guided, The Claim 1 characterized by the above-mentioned. sewing machine. 前記第１、第２針棒糸案内を金属板で一体形成したことを特徴とする請求項１〜５の何れかに記載のミシン。The sewing machine according to any one of claims 1 to 5, wherein the first and second needle bar thread guides are integrally formed of a metal plate. 上糸を所定の移動方向に移動させたときに、前記第１、第２糸案内部により上糸が案内されて前記第１，第２糸掛け部に糸掛けされるように構成したことを特徴とする請求項１〜６の何れかに記載のミシン。When the upper thread is moved in a predetermined moving direction, the upper thread is guided by the first and second thread guides and is threaded by the first and second thread hooks. The sewing machine according to any one of claims 1 to 6, characterized in that: 前記第１糸案内部から下方に向かって突出する突出部を有し、その突出部が前記第１の針棒糸案内と前記第２の針棒糸案内との間に亙る上糸に接触可能に配置されていることを特徴とする請求項１〜７の何れかに記載のミシン。A protruding portion protruding downward from the first thread guide portion, the protruding portion being capable of contacting an upper thread extending between the first needle bar thread guide and the second needle bar thread guide; The sewing machine according to claim 1, wherein 前記第１の針棒糸案内と前記第２の針棒糸案内との上下方向の間において、水平方向に伸展する水平伸展部を有し、その水平伸展部が前記第１の針棒糸案内と前記第２の針棒糸案内との間に亙る上糸に接触可能に配置されていることを特徴とする請求項１〜７の何れかに記載のミシン。A horizontal extending portion extending in a horizontal direction between the first needle bar thread guide and the second needle bar thread guide in a vertical direction, and the horizontal extending portion is provided with the first needle bar thread guide; The sewing machine according to any one of claims 1 to 7, wherein the sewing machine is arranged so as to be able to contact an upper thread extending between the needle bar thread guide and the second needle bar thread guide. 前記第１糸案内部から下方に向かって突出する突出部と、前記第１の針棒糸案内と前記第２の針棒糸案内との上下方向の間において、水平方向に伸展する水平伸展部とを有し、その突出部及び水平伸展部が前記第１の針棒糸案内と前記第２の針棒糸案内との間に亙る上糸に接触可能に配置されていることを特徴とする請求項１〜７の何れかに記載のミシン。A horizontal extending portion extending in a horizontal direction between a projecting portion projecting downward from the first thread guide portion and a vertical direction between the first needle bar thread guide and the second needle bar thread guide. And the protrusion and the horizontal extension portion are arranged so as to be able to contact the upper thread extending between the first needle bar thread guide and the second needle bar thread guide. The sewing machine according to claim 1. 前記第１糸掛け部は、縫製時の上糸を案内するガイド穴と、このガイド穴よりも幅が狭くこのガイド穴をその外部と連通させる開放部とを有することを特徴とする請求項１〜１０の何れかに記載のミシン。The said 1st thread hook part has a guide hole which guides the upper thread at the time of sewing, and an opening which is narrower than this guide hole and which connects this guide hole with the exterior. The sewing machine according to any one of claims 10 to 10. 前記第１糸掛け部は、縫製時の上糸を案内するガイド穴を有し、このガイド穴が、前記第２糸掛け部に糸掛けされる上糸の移動方向と交差する方向に伸展するように形成されたことを特徴とする請求項１〜１１の何れかに記載のミシン。The first thread hooking portion has a guide hole for guiding the upper thread during sewing, and the guide hole extends in a direction intersecting the moving direction of the upper thread hooked on the second thread hooking portion. The sewing machine according to any one of claims 1 to 11, wherein the sewing machine is formed as described above. 前記第１糸案内部が、前記ガイド穴よりも前記縫針側に位置し、前記ガイド穴は、前記縫針側の端部においてその外部に開放状に形成されていることを特徴とする請求項１１又は１２に記載のミシン。12. The sewing machine according to claim 11, wherein the first thread guide is located closer to the sewing needle than the guide hole, and the guide hole is formed to be open to the outside at an end on the needle side. Or the sewing machine according to 12. 前記ガイド穴が、前記第１糸案内部の終端部よりも前記縫針側に位置していることを特徴とする請求項１１又は１２に記載のミシン。The sewing machine according to claim 11, wherein the guide hole is located closer to the sewing needle than an end portion of the first thread guide. 前記第２糸掛け部が、前記ガイド穴よりも前記縫針側に位置していることを特徴とする請求項１１〜１４の何れかに記載のミシン。The sewing machine according to any one of claims 11 to 14, wherein the second thread hooking part is located closer to the sewing needle than the guide hole. ミシン頭部に上下動自在に配設された針棒を備えたミシンの針棒糸案内において、
前記針棒の下端部に上下に離隔して設けられる第１，第２の針棒糸案内であって、金属板で一体形成された第１，第２の針棒糸案内を備え、
前記第１の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第１糸案内部と、この第１糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第１糸掛け部とを備え、
前記第２の針棒糸案内は、糸掛けされる上糸の移動方向と交差する方向へ上糸を案内する第２糸案内部と、この第２糸案内部で案内された上糸を導入して糸掛け可能な外部へ開放状の第２糸掛け部とを備え、
前記第１，第２糸案内部が平面視で互いに交差するように構成されたことを特徴とするミシンの針棒糸案内。In a needle bar thread guide of a sewing machine having a needle bar which is disposed on the sewing machine head so as to be vertically movable,
First and second needle bar thread guides provided at the lower end of the needle bar vertically apart from each other, and provided with first and second needle bar thread guides integrally formed of a metal plate;
The first needle bar thread guide introduces a first thread guide that guides the upper thread in a direction intersecting with the moving direction of the upper thread to be threaded, and an upper thread guided by the first thread guide. And a first threading portion which is open to the outside and can be threaded,
The second needle bar thread guide introduces a second thread guide section for guiding the upper thread in a direction intersecting with the moving direction of the upper thread to be threaded, and the upper thread guided by the second thread guide section. And a second threading portion that is open to the outside and can be threaded.
A needle bar thread guide for a sewing machine, wherein the first and second thread guides are configured to cross each other in a plan view.
JP2003010979A 2002-12-10 2003-01-20 Sewing machine and needle bar thread guide of the sewing machine Pending JP2004236673A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7197995B2 (en) 2004-07-27 2007-04-03 Brother Kogyo Kabushiki Kaisha Needle bar thread guide for sewing machine
US7322305B2 (en) 2006-01-19 2008-01-29 Brother Kogyo Kabushiki Kaisha Needle bar thread guide for sewing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7197995B2 (en) 2004-07-27 2007-04-03 Brother Kogyo Kabushiki Kaisha Needle bar thread guide for sewing machine
EP1621656A3 (en) * 2004-07-27 2007-04-18 Brother Kogyo Kabushiki Kaisha Needle bar thread guide for sewing machine
US7322305B2 (en) 2006-01-19 2008-01-29 Brother Kogyo Kabushiki Kaisha Needle bar thread guide for sewing machine

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