JP2004024539A

JP2004024539A - Sewing machine

Info

Publication number: JP2004024539A
Application number: JP2002185304A
Authority: JP
Inventors: Kenji Yoshida; 吉田　憲司
Original assignee: Aisin Seiki Co Ltd
Current assignee: Aisin Corp
Priority date: 2002-06-25
Filing date: 2002-06-25
Publication date: 2004-01-29
Also published as: TWI243221B; CN1478938A; TW200401063A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine with a threading device having good operability without simultaneous operation of both hands of a user for threading. <P>SOLUTION: This threading device includes: a needle bar thread hanging part 6 for hanging a thread of the needle bar; a thread holding part 25 for holding a thread part 24c of a thread 24; a thread guide body 14 for holding the thread 24 hung on the needle bar thread hanging part 6 and held on the thread holding part 25 in the horizontal direction with rotation; a threading hook body 13 rotatably provided and having a hook part inserted in an eye of a needle 7; a cam part 21 for automatically releasing pressing and holding of the thread holding part 25 to the thread part 24c when the hook part of the threading hook body 13 is on standby or rotated in the reverse direction; and an operating lever part 8B for interlocking rotation of the thread guide body 14, rotation of a mediating gear 16, reverse rotation of the threading hook body 13 and the operation of the cam part 21. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は糸を針の目穴に自動的に通す糸通し装置を有するミシンに関する。
【０００２】
【従来の技術】裁縫の際には、煩わしい作業は針の目穴に糸を通すことである。そこで、従来、目穴を有する針が取り付けられる針留をもつ針棒と、糸を針の目穴に通す糸通し装置とを有するミシンが提供されている（特開平４−６４３８６号公報）。上記公報に係る糸通し装置は、昇降可能に設けられた操作レバー部と、操作レバー部の操作に応じて退避位置と糸通し位置との間を上下動される支持体と、支持体の回動に伴い針の目穴に挿入されるフック部と、糸のうち使用者の指先が把持している把持部分と糸掛部との間の途中の糸部分を補足してフック部に掛ける準備状態に糸を保持するガイド片とを有する。このものによれば、針の目穴に糸を自動的に通すことができるため、裁縫作業が楽になるという利点を有する。
【０００３】
【発明が解決しようとする課題】
しかしながら上記した特開平４−６４３８６号公報の技術によれば、糸通しの際には、操作レバー部の操作と、指先で糸を把持する操作との双方が同時に必要とされる。このため糸通しの際には、使用者の両手による同時操作が必須とされ、必ずしも操作性が良好なものではない。
【０００４】
本発明は上記した実情に鑑みてなされたものであり、糸通しの際に使用者の両手の同時操作が必須とされず、操作性が良好な糸通し装置をもつミシンを提供することを課題とするにある。
【０００５】
【課題を解決するための手段】
本発明に係るミシンは、目穴を有する針が取り付けられる針留をもつ針棒と、針棒を保持する針棒腕と、糸を針の目穴に通す糸通し装置とを有するミシンにおいて、糸通し装置は、針棒に直接的にまたは間接的に設けられ針棒側に位置する糸を掛ける針棒糸掛け部と、糸のうち針棒から離れた位置の糸部分を把持すると共に把持解除可能に設けられた糸把持部と、回動可能に設けられ、針棒糸掛け部に掛けられると共に糸把持部に把持されている糸を回動に伴い水平方向に沿って保つ糸ガイド体と、回動可能に設けられ、針の目穴に挿入可能なフック部をもち、回動に伴いフック部を針の目穴に挿入して糸に係合可能な係合位置とし、逆方向への回動に伴い、糸を係合した状態のフック部を針の目穴から離脱させて糸を針の目穴に通す糸通しフック体と、糸通しフック体のフック部が正方向回動の初期段階にある際及び逆方向に回動する際に糸把持部の糸部分の把持を解除するように作動するカム部と、糸ガイド体の回動、糸通しフック体の回動、糸通しフック体の逆方向の回動、カム部の作動を連動させる操作レバー部とを有することを特徴とするものである。
【０００６】
使用者が操作レバー部を操作すれば、糸ガイド体の回動、糸通しフック体の回動、糸通しフック体の逆方向の回動、カム部の作動が自動的に行われ、針の目穴に糸が自動的に通される。殊に、カム部の作動により、糸把持部の把持作用が解除されるため、フック部に糸が良好に掛けられる。
【０００７】
【発明の実施の形態】
本発明のミシンによれば、次の形態の少なくとも一を採用できる。
【０００８】
・針棒腕に回動可能に設けられ糸通しフック体を保持する糸通し棒と、糸通し棒の回動に伴い糸通しフック体に連動し、糸通しフック体と逆方向に糸ガイド体を回動させる歯車機構とが設けられている形態を採用できる。この場合、操作レバー部の操作に伴い、糸通し棒をこれの軸芯回りで回動させることにより、糸通しフック体及び糸ガイド体を互いに逆方向に回動させ、以て糸通しフック体のフック部を針の目穴に挿入する形態を採用できる。糸通しフック体の回動及び糸ガイド体の回動を同期させることができる。・糸を水平方向に沿って保つための糸ガイド体の回動速度を、糸通しフック体の回動速度よりも速くする増速機構を有する形態を採用できる。この場合には、糸ガイド体の回動速度が確保されるため、回動前の初期位置における糸ガイド体を針の位置からできるだけ遠ざけることができ、針付近のスペースを広くするのに貢献できる。
【０００９】
糸把持部の把持解除を行うカム従動子が設けられている形態を採用できる。この場合、カム部は、カム従動子が走行すると共に走行に伴い糸把持部の把持解除を行うカム面を有する。従って、操作レバー部の操作に伴い、カム面に沿ってカム従動子を作動させて、糸把持部の把持作用を解除し、糸把持部による糸把持を解除することができる。
【００１０】
操作レバー部が操作されると、操作に連動させて糸通しフック体のフック部を糸通し方向に回動させる回動カム部が設けられている形態を採用できる。この場合、操作レバー部の操作が解除されると、回動カム部を逆動させて糸通しフック体のフック部を逆方向に回動させて初期位置に戻すバネを有することができる
糸把持部は、糸を挟持する１組の挟持部材と、挟持部材を挟持方向に付勢するバネ等の付勢部材とを有する形態にできる。この場合、カム部のカム作用により、挟持部材による挟持が解除され、ひいては把持解除作用が行われる。
【００１１】
針棒糸掛け部の糸掛け高さと、糸把持部による糸掛け高さとはほぼ同じ程度が好ましい。この場合、フック部に引っかかる前の状態の糸を水平に沿って保つのに有利である。
【００１２】
【実施例】
以下、本発明の実施例を図面を参照してより具体的に説明する。図１は糸通し装置の初期位置を示す。図２は糸通し装置の作動の進行途中を示す。図３は糸通し装置の作動の進行終期を示す。図４は糸通し装置の要部構造を示す。図５は糸通しフック体１３の平面形態を示す。図６は糸把持部２５による把持を解除するためのカム部２１の斜視図を示す。図７はカム部２１の円弧溝部付近を示す。図８はカム部２１の直線溝部付近を示す。図９は図１に示す状態の平面図を示す。図１０は図２に示す状態の平面図を示す。図１１は図３に示す状態の平面図を示す。図１２は図１１の矢印Ｘ１２方向から見た状態の図を示す。図１３は針７の目穴７Ａにフック部２０が挿入された状態を示す。
【００１３】
本実施例においては、図１に示すように、針棒腕１は家庭用ミシンの機枠（図示せず）に対し揺動可能に取付けられている。針棒腕１は部位１ａ、１ｂ、１ｃ、１ｄを有する。ミシンの機枠内に回転可能に配置されている上軸５０で駆動されるクランク機構６０により、針棒抱き３を介して、縦長の針棒２が上下往復運動可能に設けられている。針棒２の高さ方向の中央域には、ストッパ部４Ａを有するストッパ４が装着されている。ストッパ４の下方に針棒抱き３が配置されている。針棒２の下端部には、ねじ５ｃをもつ針留５が装着されている。針留５には、上糸である糸２４を掛けるための針棒糸掛け部６が設けられている。針留５には針７が着脱可能に固着されている。
【００１４】
針棒腕１の部位１ａ、１ｃには、針棒２に対し平行な縦軸型の糸通し棒９が装着されている。糸通し棒９は針棒腕１に対して上下動可能に設けられている。また糸通し棒９はこれの軸芯Ｐ１の回りで回動可能に針棒腕１に設けられている。糸通し体８は部位８ｆ、８ｈをもつ。部位８ｆ、８ｈと糸通し棒９とを嵌合することにより、糸通し体８が糸通し棒９に対して昇降可能に取り付けられている。糸通し体８の上部には螺旋状に沿った溝カム形状の回動カム部８Ａが形成されている。回動カム部８Ａは下端８Ａ１及び上端８Ａ２をもつ。糸通し体８は、これの下部に使用者の指先で押圧操作される操作レバー部８Ｂを有する。
【００１５】
糸通し棒９の軸長方向の中間域には、回動操作子である回動ピン１０が糸通し棒９に対し直交するように固定されている。回動ピン１０の一端１０ｈがストッパ４のストッパ部４Ａに当接可能となるように、また回動ピン１０の他端１０ｍが糸通し体８の螺旋状の回動カム部８Ａに当接可能となるように、回動ピン１０の長さは設定されている。
【００１６】
糸通し体８の座部８ｘと針棒腕１の部位１ｄの座部１ｘとをつなぐコイル状の糸通しバネ１１が装着されている。糸通し前の初期位置においては、糸通しバネ１１により糸通し体８は上方へつまり矢印Ｙ１方向に持ち上げられている。糸通し棒９の回動ピン１０と糸通し体８の部位８ｆとの間に、コイル状の糸通し棒バネ１２が装着されている。糸通し棒バネ１２は糸通し体８に対し糸通し棒９を下方つまり矢印Ｙ２方向に付勢して押し下げている。糸通し棒バネ１２のバネ力は糸通しバネ１１のバネ力よりも強いため、図１に示す初期位置においては回動ピン１０は溝カム部８Ａの下端８Ａ１に位置している。使用者が指先で糸通し体８の操作レバー部８Ｂを下方つまり矢印Ｙ１方向に押し下げたとき、初期動作として糸通し体８と糸通し棒９が一体で移動し、図２に示すように回動ピン１０がストッパ４のストッパ部４Ａに当接する。図２に示すように当接した時点では、糸通し棒９のそれ以上の下降は停止される。上記したように当接した時点から、糸通し体８の操作レバー部８Ｂの更なる押圧操作により、糸通し体８が更に下方つまり矢印Ｙ２方向に移動すると、糸通し体８の部位８ｆが下降するため糸通し棒バネ１２が縮められはじめ、且つ、回動ピン１０が糸通し体８の回動カム部８Ａに沿って移動する。これにより回動ピン１０が軸芯Ｐ１の回りで回動し、糸通し棒９が時計方向つまり矢印Ｋ１方向（図９参照）に向けて回動する。使用者が糸通し体８の操作レバー部８Ｂに加えていた力を緩めると、糸通し棒バネ１２の弾性復帰作用と糸通し体８の回動カム部８Ａのカム作用とによって、糸通し棒９が反時計方向つまり矢印Ｋ２方向（図９参照）に軸芯Ｐ１を中心として回動すると共に、糸通し体８が糸通し棒９と一体となって糸通しバネ１１のバネ力により矢印Ｙ１方向に上昇し、糸通し体８と糸通し棒９とが図１に示す初期位置にひきもどされる。
【００１７】
図４に示すように、糸通し棒９の下端部には糸通しフック体１３が固定されている。図９に示すように糸通し棒９及び糸通しフック体１３は軸芯Ｐ１を中心として矢印Ｋ１，Ｋ２方向に一体回転する。糸通しフック体１３を構成する１組の板部１３ｘに、フック部２０がカシメ挟持されて固定されている。板部１３ｘの先端側にはフックガイド２７が形成されている。図１２に示すように、フック部２０は、針７の針穴７Ａに挿入されるほどの薄肉であり、糸２４を係止する係止孔２０ｍと先端傾斜面２０ｎとをもつ。
【００１８】
図５に示すように、糸通しフック体１３は、糸通し棒９の下端部に固定され糸通し棒９と一体回転する基部１３Ｄと、基部１３Ｄから横方向に延びる腕部１３Ａとをもつ。回動子１３ｔにより腕部１３Ａは基部１３Ｄに対して矢印Ｗ４方向に変位可能とされている。腕部１３Ａには、腕部１３Ａに沿った長穴部１３Ｂが形成されている。腕部１３Ａには摺動可能に取付けられた一方向作動式つまりワンウェイ式のカム部２１が設けられている。このワンウェイ式のカム部２１は、カム従動子として機能する後述する突部１７Ａが走行可能に嵌合する溝形状のカム面２２をもつ。カム面２２は、図６に示すように、円弧状に延びる円弧溝部２２Ａと、直線状に延びる直線溝部２２Ｂと、突部１７Ａの逆回りを防止する段部２２Ｃと、円弧溝部２２Ａ及び直線溝部２２Ｂを切り替える切替位置２２Ｅとを有する。円弧溝部２２Ａの断面形状は図７に示す状態とされている。図７に示すように、円弧溝部２２Ａは高フラット面２２Ａ１、低フラット面２２Ａ３及び両フラット面の間に形成される傾斜面２２Ａ２を有する。直線溝部２２Ｂの断面形状は図８に示す状態とされている。図８に示すように直線溝部２２Ｂは、円弧溝部２２Ａの低フラット面２２Ａ３と面一の低フラット面２２Ｂ３、円弧溝部２２Ａの高フラット面２２Ａ１より少し低い高フラット面２２Ｂ１及び両フラット面の間に形成される傾斜面２２Ｂ２を有する。直線溝部２２Ｂの高フラット面２２Ｂ１と円弧溝部２２Ａの高フラット面２２Ａ１との間の段差は、突部１７Ａの逆回りを防止する段部２２Ｃとなる。
【００１９】
図９において、糸通し棒９の下端部には、糸ガイド体１４が糸通し棒９の軸芯Ｐ１の回りで矢印Ｍ１、Ｍ２方向に空転できるように組付けられている。従って糸ガイド体１４は糸通し棒９に対して逆方向に軸芯Ｐ１の回りで相対回動可能である。糸ガイド体１４は糸２４をガイドするガイド部１４Ｂをもつ。糸ガイド体１４には外歯状のギア部１４Ａが一体的に設けられている。ギア部１４Ａは糸通し棒９の軸芯Ｐ１の回りで回動可能である。
【００２０】
図４において、糸通し体８の部位８ｓ、８ｔには、糸通し棒９に対し平行な位置に補助糸通し棒１５が回動可能となるように取付けられている。補助糸通し棒１５は縦軸型の軸芯Ｐ２を有する。補助糸通し棒１５の下端部には仲介ギア１６が固定されている。仲介ギア１６は軸芯Ｐ２を中心として回動する。図４に示すように、仲介ギア１６は、外歯状のギア部１６Ｗを有し、更に横方向に延設された腕部１６Ｋを有する。腕部１６Ｋは、突起１６Ａ１を有する嵌合ピン１６Ａをもつ。仲介ギア１６の嵌合ピン１６Ａは、糸通しフック体１３の腕部１３Ａの長穴部１３Ｂに沿って変位可能に嵌入されている。
【００２１】
補助糸通し棒１５の下端部には、水平な糸把持面１７ｒをもつ糸把持皿１７が組付けられている。図４に示すように、糸把持皿１７は補助糸通し棒１５の軸芯Ｐ２の回りで回動可能であり、且つ、補助糸通し棒１５に沿って上下方向つまり矢印Ｙ１、Ｙ２方向に摺動可能とされている。糸把持皿１７は、カム従動子として機能する下方に突出する突部１７Ａをもつ。補助糸通し棒１５にＥリング１８が取付けられている。Ｅリング１８と糸把持皿１７との間には、コイル状の糸把持バネ１９が補助糸通し棒１５と同軸的に組付けられている。糸把持バネ１９は糸把持皿１７を常に下方つまり矢印Ｙ２方向、換言すれば、糸把持方向に付勢している。
【００２２】
糸把持皿１７の下部に突設されたカム従動子として機能する突部１７Ａは、糸把持バネ１９のバネ力により、カム部２１のカム面２２に付勢されて当接している。即ち、図５に示すように、糸把持皿１７の突部１７Ａは、ワンウェイ式のカム部２１の円弧溝部２２Ａまたは直線溝部２２Ｂに嵌入しており、カム面２２の凹凸形状を拾い、これに伴い糸把持皿１７が矢印Ｙ１、Ｙ２方向に上下動する。
【００２３】
本実施例に係る糸把持部２５は糸を挟持して把持できるものであり、仲介ギア１６の腕部１６Ｋと糸把持皿１７とで構成されている。即ち、図４から理解できるように、付勢部材としての糸把持バネ１９のバネ力により糸把持皿１７が下方向つまり矢印Ｙ２方向に付勢されているため、仲介ギア１６の腕部１６Ｋの糸把持面１６ｒと糸把持皿１７の糸把持面１７ｒとの間に糸２４の糸部分２４ｃを水平方向に沿って滑り込ませると、糸部分２４ｃを腕部１６Ｋの糸把持面１６ｒと糸把持皿１７の糸把持面１７ｒとで把持することができる。従って、腕部１６Ｋ、糸把持皿１７は、糸２４の糸部分２４ｃを挟持して把持する１組の挟持部材として機能できる。
【００２４】
糸把持部２５の詳細を、図１４〜図１６を参照して説明する。フック体１３の待機時（図１・図９）、図１４に示されるように、糸把持皿１７の把持面１７ｒと腕部１６Ｋの糸把持面１６ｒとの間には所定隙間（０．４ｍｍ）が形成されており、糸２４の糸部分２４ｃが入れ込まれるようになっている。かように入れ込まれた糸２４は、突起１７ｚにより、抜けとめされる。糸掛け時（図１０・図１１）、図１５に示されるように、カム面２２に従動する突部１７Ａが糸把持皿１７を下降せしめて、糸２４を糸把持皿１７の把持面１７ｒと腕部１６Ｋの糸把持面１６ｒとの間で挟持する。そして、糸開放時は、図１６に示されるように、カム面２２に従動する突部１７Ａが糸把持皿１７を、図１４の状態よりも少し高く上昇、糸２４を糸把持皿１７の把持面１７ｒと腕部１６Ｋの糸把持面１６ｒとの間の挟持から開放する。
【００２５】
図９に示すように、仲介ギア１６のギア部１６Ｗと糸ガイド体１４のギア部１４Ａとが噛み合って歯車機構を構成している。ここで、糸通しフック体１３が矢印Ｋ１方向に回動すると、糸通しフック体１３の腕部１３Ａが軸芯Ｐ１を中心として矢印Ｋ１０方向（＝矢印Ｋ１方向）に回動するため、腕部１３Ａの長穴部１３Ｂも同方向に回動する。このため、長穴部１３Ｂに嵌合している嵌合ピン１６Ａ及び腕部１６Ｋを介して仲介ギア１６が軸芯Ｐ２を中心として矢印Ｒ１方向に回転する。すると、糸ガイド体１４のギア部１４Ａが軸芯Ｐ１を中心として矢印Ｒ２方向に回動する。即ち、糸ガイド体１４は軸芯Ｐ１を中心として、糸通しフック体１３の回動方向（矢印Ｋ１方向）に対して逆方向（矢印Ｍ１方向）に回動する。
【００２６】
ワンウェイ式のカム部２１の作用について更に説明を加える。即ち、糸把持皿１７の突部１７Ａはカム部２１のカム面２２の形状に沿って移動するが、突部１７Ａの初期位置は図５に示したような初期位置Ｔ１にある。糸通しフック体１３が軸芯Ｐ１を中心として矢印Ｋ１方向に回動を始めると、それに伴い糸通しフック体１３の腕部１３Ａが軸芯Ｐ１を中心として矢印Ｋ１０方向（＝矢印Ｋ１方向）回動し始め、糸把持皿１７の突部１７Ａがワンウェイ式のカム部２１のカム面２２に沿って走行する。このとき、カム部２１の直線溝部２２Ｂと円弧溝部２２Ａとの境界の段部２２Ｃによって突部１７Ａの進行が妨げられるため、突部１７Ａは自動的に直線溝部２２Ｂの方へつまり矢印Ｔ２方向に沿って移動する。このときカム部２１は矢印Ｗ４方向（図５参照）に沿って適宜変位できる。さらに、糸通しフック体１３の矢印Ｋ１方向への回動終了時点では、突部１７Ａがカム面２２の切替位置２２Ｅに到達しており、糸通し体８は下死点にきている。次に、操作レバー部８Ｂの押圧操作が解除されるので、糸通し棒バネ１２のバネ反力によって糸通しフック体１３が逆方向つまり矢印Ｋ２方向（図９参照）に回動を始め、それに伴い突部１７Ａもカム面２２の円弧溝部２２Ａへ移動する。この結果、突部１７Ａが円弧溝部２２Ａの傾斜面２２Ａ２を登り走行し、高レベル面２２Ａ１を経て直線溝部２２Ｂの高レベル面２２Ｂ１に至る。この結果、カム従動子として機能する突部１７Ａが矢印Ｙ１方向に持ち上げられ、ひいては突部１７Ａをもつ糸把持皿１７が矢印Ｙ１方向に持ち上げられ、糸把持部２５による糸２４の把持作用が解除される。
【００２７】
しかして、糸２４を針７の目穴７Ａに通す場合について説明を加える。まず、針棒２が上死点付近にあることを確認する。そして図示しない糸駒から各ガイド部を経た上糸である糸２４を指先で摘み、針棒２の針留５の針棒糸掛け部６にガイドする。更に図１に示すように、糸２４を糸ガイド体１４のガイド部１４Ｂに引っ掛ける。更に、仲介ギア１６と糸把持皿１７とで構成された糸把持部２５に糸２４を差し込むことにより、糸２４の糸部分２４ｃを図１４の状態にある糸把持部２５に装着する。これにより糸２４のうち針棒２側は針留５の針棒糸掛け部６に掛けられていると共に、糸２４のうち針棒２から離れた糸部分２４ｃは、図１４に示されるように、糸把持部２５及び突起１７ｚにより、自由且つ外れないように、保持されており、これにより、図示されない糸取りバネの作用を吸収することができる。
【００２８】
上記したように糸２４を針留５の針棒糸掛け部６に掛けると共に、糸２４のうち針棒２から離れた糸部分２４ｃを図１４の状態にある糸把持部２５に係止した状態で、図１において、作業者が糸通し体８の操作レバー部８Ｂを指先で下方つまり矢印Ｙ２方向に押し下げる。すると、糸部分２４ｃを図１５の状態にある糸把持部２５に把持された状態で、糸通しバネ１１のバネ力に抗して糸通し体８が矢印Ｙ２方向に下降する。この場合、糸通し体８と糸通し棒９に取付けられた糸通し装置全体は、針棒２に対してほぼ平行に下降する。
【００２９】
糸通し装置全体がある程度下降すると、図２に示すように、糸通し棒９に嵌入された回動ピン１０が、針棒２のストッパ４のストッパ部４Ａに当接し、回動ピン１０のそれ以上の下降が妨げられる。しかし、使用者が指先で糸通し体８の操作レバー部８Ｂを更に押し下げると、糸通し体８の部位８ｆで押圧された糸通し棒バネ１２が弾性収縮され、糸通し棒バネ１２にバネ力が蓄積される。そして、糸通し棒バネ１２のバネ力に抗して糸通し体８が更に矢印Ｙ２方向に下降する。このとき、糸通し回動ピン１０の他端１０ｍは糸通し体８の回動カム部８Ａに係合しており、しかも（図示しないが）回動カム部８Ａのカム溝は螺旋状に沿っているため、糸通し体８が回動カム部８Ａと共に下降することにより、回動ピン１０は糸通し棒９の軸芯Ｐ１を中心に一体的に時計方向つまり矢印Ｋ１方向（図９参照）に回動する。
【００３０】
ここで、使用者が指先で糸通し体８の操作レバー部８Ｂを更に押し下げ、糸通し体８が下死点に到達したときには、フック部２０の高さ位置が針７の針穴７Ａの高さ位置と同一になるように、ストッパ４の高さ位置は設定されている。
【００３１】
上記したように使用者が糸通し体８の操作レバー部８Ｂを押圧操作して糸通し体８を矢印Ｙ１方向に押し下げるときには、回動ピン１０と共に糸通し棒９は時計方向つまり矢印Ｋ１方向（図９参照）に回動する。この結果、糸通し棒９に下端に固着された糸通しフック体１３も時計方向つまり矢印Ｋ１方向（図９〜図１１参照）に回動し、図１１及び図１３に示すように糸通しフック体１３のフック部２０が針７の針穴７Ａに挿入される。
【００３２】
一方、糸通しフック体１３の後端側に連設されている腕部１３Ａも軸芯Ｐ１を中心として同様に時計方向（矢印Ｋ１０＝矢印Ｋ１方向）に回動する。このため、腕部１３Ａの長穴部１３Ｂに嵌合している嵌合ピン１６Ａ及び腕部１６Ｋにより、仲介ギア１６は同じく時計方向（矢印Ｒ１方向）に回動する。仲介ギア１６のギア部１６Ｗと糸ガイド体１４のギア部１４Ａとのギア比は、１：１とされているため、糸ガイド体１４のギア部１４は、軸芯Ｐ１を中心として、仲介ギア１６と同じ回動角度で反時計方向（矢印Ｒ２方向）に回動する。
【００３３】
この場合、仲介ギア１６は増速される。即ち、図１１において、仮想線Ｖ１は、糸通し棒９の未回動時における回動中心である軸芯Ｐ１と嵌合ピン１６Ａの中心とを結ぶ。仮想線Ｖ２は、糸通し棒９の回動終了時における軸芯Ｐ１と嵌合ピン１６Ａの中心とを結ぶ。ここで軸芯Ｐ１を中心として回動する糸通しフック体１３の腕部１３Ａの回動角度はＡである。軸芯Ｐ２を中心として回動する仲介ギア１６の腕部１６Ｋの回動角度はＢである。図１１に示すように、回動角度Ｂは回動角度Ａよりもかなり大きい（Ｂ＞Ａ）。故に、仲介ギア１６の腕部１６Ｋは糸通しフック体１３の腕部１３Ａよりも回動角度が大きい。従って、仲介ギア１６の腕部１６Ｋに連設されているギア部１６Ｗは、多めに回動する。つまりギア部１６Ｗは増速される。このようにように仲介ギア１６のギア部１６Ｗが増速されることになり、ひいてはギア部１６Ｗと同期回転する糸ガイド体１４のギア部１４Ａも増速される。上記したように糸ガイド体１４のギア部１４Ａを増速できる場合には、初期位置における糸ガイド体１４を針４の位置から矢印Ｍ２方向に向けてできるだけ遠ざけることができ、針４付近のスペースを広くするのに貢献でき、裁縫作業に有利となる。
【００３４】
本実施例においては、上記した仲介ギア１６のギア部１６Ｗの回転により、ギア部１４Ａを有する糸ガイド体１４は軸芯Ｐ１の回りで反時計方向つまり矢印Ｍ１方向（図９参照）に回動する。糸ガイド体１４の矢印Ｍ１方向への回動が進むと、糸ガイド体１４のガイド部１４Ｂは、始動位置Ｓ１から、針７よりも右側の回動位置Ｓ２（図１１参照、図３参照）に位置するようになる。この結果、糸ガイド体１４のガイド部１４Ｂに掛けられている糸２４は、図３及び図４に示すように、針７の針穴７Ａの前面でほぼ水平に保たれる。
【００３５】
本実施例においては、上記したように糸２４が針７の針穴７Ａの前面でほぼ水平に保たれた直後に、糸通しフック体２０が矢印Ｋ１方向に回動して係合位置Ｓ３に至っても良い。あるいは、糸通しフック体２０が矢印Ｋ１方向に回動して係合位置Ｓ３に至った直後に、糸ガイド体１４のガイド部１４Ｂに掛けられている糸２４がほぼ水平に保たれる形態としても良い。あるいは、同時タイミングでも良い。
【００３６】
本実施例では、図１２において、糸２４が矢印Ｍ１方向に移送されてきたとき、糸部分２４ｃは挟持部材１７・１６により挟持されており、更に、糸２４の他端（糸駒側）方向は、プレテンションバネ（図示略）により張力が作用しているため、糸通しフック体１３のフックガイド２７の先端側の傾斜案内面で形成されているガイド２７ｘに沿って、または、フック部２０の先端傾斜面２０ｎに沿って、糸２４はフック部２０側に案内される。即ち、糸２４をフック部２０の係止孔２０ｍに対面するように案内することが可能となる。この場合、図１２に示すように、針７の針穴７Ａを通り係合位置Ｓ３に到達したフック部２０は、糸２４に係合可能となる。
【００３７】
次に、図３に示す状態において、使用者が糸通し体８の操作レバー部８Ｂから指先を放すと、弾性収縮されていた糸通し棒バネ１２のバネ反力により糸通し体８が回動カム部８Ａと共に矢印Ｙ１方向に上昇を開始する。よって糸通し体８の螺旋状の回動カム部８Ａのカム部作用により、糸通しフック体１３がフック部２０と共に糸通し棒９の軸芯Ｐ１の回りで反時計方向つまり矢印Ｋ２方向（図１１参照）に回動すると共に、糸ガイド体１４が矢印Ｍ２方向に回動する。これにより係合位置Ｓ３のフック部２０が矢印Ｋ２方向に後退するため、フック部２０が針穴７Ａを通り、針穴７Ａから矢印Ｋ２方向に離脱する。換言すると、図１２に示す状態のフック部２０が糸２４を引っ掛け、糸２４を引っ掛けた状態のフック部２０が針７の針穴７Ａを通り、矢印Ｋ２方向に沿って針穴７Ａから離脱する。
【００３８】
本実施例においては、上記したように糸２４を引っ掛けたフック部２０が逆方向（矢印Ｋ２方向）に回動するときには、図８に示すように、ワンウェイ式のカム部２１のカム面２２に係合した糸把持皿１７の突部１７Ａが、カム面２２の傾斜面２２Ｂ２を登って、高レベル面２２Ｂ１に乗り上げるため、糸把持皿１７が矢印Ｙ１方向に持ち上げられる。この結果、糸把持部２５による糸２４の糸部分２４ｃの把持は、解除される。このように糸２４の糸部分２４ｃの把持が自動的に解除されるため、糸２４を引っ掛けた状態のフック部２０が針７の針穴７Ａを通り、針穴７Ａから容易に離脱することができる。
【００３９】
さらに、使用者が糸通し体８の操作レバー部８Ｂから指先を放した場合には、糸通し棒バネ１１のバネ反力により糸通し体８が矢印Ｙ１方向に上昇し、回動ピン１０を持ち上げるため、糸通し棒９が上昇し、フック部２０も矢印Ｙ１方向に上昇を始めるが、糸２４の糸部分２４ｃの把持は解除されているため、フック部２０から糸２４が簡単に外れ、しかも糸通し体８の上昇に影響されずに針穴７Ａ部には糸ループが残り、小さくなったり抜けたりすることがない。この状態では、針７の目穴７Ａに糸２４が通されていると共に、針穴７Ａの後方に適度な大きさの糸ループが形成されている。
【００４０】
以上説明したように本実施例においては、使用者が操作レバー部８Ｂを操作すれば、糸ガイド体１４の回動、糸通しフック体１３の矢印Ｋ１方向への回動、糸通しフック体１３の逆方向である矢印Ｋ２方向への回動、カム部２１の作動が自動的に行われ、針７の目穴７Ａに糸２４が通される。そして、針７の目穴７Ａに糸２４が通された後には、糸把持部２５の把持は自動的に解除される。
【００４１】
従って本実施例においては、糸通しの際には、上糸である糸２４を針棒糸掛け部６に掛けると共に、糸２４のうち針棒２から離れた糸部分２４ｃを糸把持部２５に係止しておけば、使用者は指先で操作レバー部８Ｂを矢印Ｙ２方向に押圧操作すれば、針７の目穴７Ａに糸２４を自動的に通すことができる。よって、使用者は操作レバー部８Ｂを指先で操作するだけで足り、上記した従来公報技術とは異なり、使用者の両手の同時操作を必須とされず、糸通し作業の操作性が良好となる。
【００４２】
本実施例においては、針棒糸掛け部６の高さと糸２４を把持するための糸把持部２５の高さとがほぼ同一であるため、ほぼ真横へ糸２４を水平方向に沿って保つことができ、糸２４の掛け間違いがなくなるようにできる。更に糸ガイド体１４のガイド部１４Ｂの高さ位置も、針棒糸掛け部６の高さ位置と糸把持部２５の高さ位置とがほぼ同一であるため、糸２４をほぼ真横へを水平方向に沿って保つのに一層有利となる。
【００４３】
また糸把持部２５においては、糸２４を把持すべきタイミングと、把持を解除すべきタイミングとがある。糸把持皿１７の開閉をカム部２１のカム面２２の凹凸によって達成し、糸把持部２５の把持解除を自動で行なうことができる。
【００４４】
また本実施例においては、糸通しフック体１３のフック部２０へ糸２４を引っかけるために糸２４を水平方向に沿って保つための糸ガイド体１４を、糸通しフック体１３の回動方向に対して逆方向に回動させる構造は、仲介ギア１６を用いた歯車機構によって達成されている。このような歯車機構を用いたことにより、糸通し装置全体の省スペース化も達成するのに有利となる。よって、外観の形状を損なうことなく新種類のミシンのみならず、現有機種のミシンへの展開も用途なる。
【００４５】
上記した実施例における糸把持部２５の把持解除作用を、図１７に依拠してまとめておくと次のようになる。図１７において、縦軸は突部１７Ａのレベル位置を示し、横軸は突部１７Ａのカム面２２での所在位置を示す。すなわち、横軸において、ゾーンＡ、ゾーンＢ、ゾーンＣ、ゾーンＤ、ゾーンＥ、ゾーンＦ及びゾーンＨは、突部１７Ａが、夫々、直線溝部２２Ｂの高フラット面２２Ｂ１、直線溝部２２Ｂの傾斜面２２Ｂ２、直線溝部２２Ｂの低フラット面２２Ｂ３、円弧溝部２２Ａの低フラット面２２Ａ３、円弧溝部２２Ａの傾斜面２２Ａ２、円弧溝部２２Ａの高フラット面２２Ａ１及び直線溝部２２Ｂの高フラット面２２Ｂ１上にあることを示す。しかして、糸把持面１６ｒと糸把持皿１７の糸把持面１７ｒとの間の糸２４の糸部分２４ｃは、各ゾーンにおいては、次のような状態になっている。
【００４６】
ゾーンＡ：糸把持部２５は図１４に示す状態にあり、このとき、糸２４の糸部分２４ｃは、糸把持面１６ｒと糸把持皿１７の糸把持面１７ｒとの間に非挟着状態で位置するも、突起１７Ｚと係止することにより、抜け出ることはない。
【００４７】
ゾーンＢ：糸把持皿１７の糸把持面１７ｒが徐々に糸把持面１６ｒ方向に下降し、糸２４の糸部分２４ｃを挟持しはじめる。
【００４８】
ゾーンＣ：糸把持部２５は図１５に示す状態となり、糸２４の糸部分２４ｃは、糸把持面１６ｒと糸把持皿１７の糸把持面１７ｒとの間で挟着状態となる。
【００４９】
ゾーンＤ：ゾーンＣと同じ
ゾーンＥ：糸把持皿１７の糸把持面１７ｒが徐々に糸把持面１６ｒから離れはじめ、糸２４の糸部分２４ｃを開放しはじめる。
【００５０】
ゾーンＦ：糸把持部２５は図１６に示す状態となり、糸２４の糸部分２４ｃは、糸把持面１６ｒと糸把持皿１７の糸把持面１７ｒとの間で、ゾーンＡの状態よりも、更なる非挟着状態となる。
【００５１】
ゾーンＧ：ゾーンＡと同じ状態のゾーンＧへの変移過程。
【００５２】
ゾーンＨ：ゾーンＡと同じ。
【００５３】
ゾーンＡにおいては、糸２４の糸部分２４ｃは、糸把持面１６ｒと糸把持皿１７の糸把持面１７ｒとの間に非挟着状態で位置するも、突起１７Ｚにより、抜け出ることはないので、糸掛けを、図示されない糸取りバネを作用を吸収できる。これにより、糸ループ形成後、糸取りバネにより糸ループが崩される危惧はない。
【００５４】
上記した実施例において部材が設けられている位置、形状、移動方向等は、上記した実施例のみの形態に限定されるものではなく、適宜変更できる。上記した実施例において、糸通しの際には使用者は指先で操作レバー部８Ｂを下方つまり矢印Ｙ２方向に押圧操作するように設定されているが、これに限られるものではなく、場合によっては、糸通しの際に操作レバー部を上方に操作することにしても良い。上記した実施例における各バネはコイル形状に限定されるものでなく、場合によっては板バネ等でも良く適宜選択できる。また、カム部２１とフック体１３を一体形成しても良い。更には、図１７に示した把持・解除のタイミングは例示であって、これに限定されるものではない。なお上記した実施例は上記し且つ図面に示す実施例のみに限定されるものではなく、要旨を逸脱しない範囲内で適宜変更して実施できるる。本実施例に記載の部材の形容は例示であり、一部であっても各請求項に記載できるものである。
【００５５】
【発明の効果】
本発明にミシンによれば、使用者が操作レバー部を操作すれば、糸ガイド体の回動、糸通しフック体の正方向回動、糸通しフック体の逆方向の回動、カム部の作動が行われ、針の目穴に糸が通される。殊に、カム部が作動して糸把持部の把持作用を自動的に解除できる。従って、糸通しの際に使用者の両手による同時操作が必須とされず、糸通しの操作性が良好となる。しかも、糸通しフック体の待機時に糸は糸把持部に把持されていないので、糸掛け時、糸取りバネの作用を吸収でき、これにより、糸ループ形成後、糸取りバネにより糸ループが崩される危惧はない。
【図面の簡単な説明】
【図１】糸通し装置の初期位置であり、糸通し体がこれの上昇端に到達している形態を示す断面図である。
【図２】糸通し装置の作動の進行途中を示す断面図である。
【図３】糸通し装置の作動の進行終期となり、糸通し体がこれの下降端に到達している形態を示す断面図である。
【図４】糸通し装置の要部構造を示す断面図である。
【図５】糸通しフック体の平面形態を示す構成図である。
【図６】糸把持部による把持を解除するためのカム部の要部の斜視図である。
【図７】カム部の円弧溝部付近の断面図である。
【図８】カム部の直線溝部付近の断面図である。
【図９】糸通し装置の初期位置であり、糸通し体がこれの上昇端に到達している形態を示す断面図であり、図１に示す状態の平面図である。
【図１０】糸通し装置の作動の進行途中を示す断面図であり、図２に示す状態の平面図である。
【図１１】糸通し装置の作動の進行終期となり、糸通し体がこれの下降端に到達している形態を示す断面図であり、図３に示す状態の平面図である。
【図１２】図１１の矢印Ｘ１２方向から見た状態の構成図である。
【図１３】針の目穴にフック部が挿入された状態を示す平面図である。
【図１４】フック体の待機時における、糸調子皿と糸把持皿との関係を示す図。
【図１５】フック体の糸掛け時における、糸調子皿と糸把持皿との関係を示す図。
【図１６】フック体の糸開放時における、糸調子皿と糸把持皿との関係を示す図。
【図１７】糸把持部の把持・解除作用を、カム部たる突部の高さを時系列的に示すグラフ。
【符号の説明】
図中、１は針棒腕、２は針棒、４はストッパ、４Ａはストッパ部、６は針棒糸掛け部、７は針、７Ａは針穴、８は糸通し体、８Ａは回動カム部、８Ｂは操作レバー部、１０は回動ピン、１１は糸通しバネ、１２は糸通し棒バネ、１３は糸通しフック体、１４は糸ガイド体、１６は仲介ギア、１６Ａは嵌合ピン、１７は糸把持皿、１７Ａは突部（カム従動子）、１９は糸把持バネ、２０はフック部、２１はカム部、２２はカム面、２２Ａは円弧溝部、２２Ｂは直線溝部、２４は上糸、２５は把持部、２７はフックガイドをそれぞれ示す。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sewing machine having a threading device for automatically passing a thread through an eye of a needle.
[0002]
2. Description of the Related Art In sewing, a troublesome operation is to pass a thread through an eye of a needle. Therefore, a sewing machine having a needle bar having a needle pin to which a needle having an eye is attached, and a threading device for passing a thread through the eye of the needle has been conventionally provided (JP-A-4-64386). The threading device according to the above publication includes an operation lever portion that is provided to be able to move up and down, a support member that is moved up and down between a retracted position and a threading position according to operation of the operation lever portion, and a rotation of the support member. Preparation for hooking the hook part by supplementing the hook part inserted into the eye hole of the needle with the movement, and the yarn part in the middle between the grip part held by the user's fingertip and the yarn hook part of the yarn And a guide piece for holding the yarn in a state. According to this configuration, the thread can be automatically passed through the eye of the needle, and therefore, there is an advantage that the sewing operation becomes easy.
[0003]
[Problems to be solved by the invention]
However, according to the technique disclosed in Japanese Patent Application Laid-Open No. 4-64386, both the operation of the operation lever unit and the operation of gripping the thread with a fingertip are required at the same time during threading. For this reason, simultaneous operation with both hands of the user is required at the time of threading, and operability is not always good.
[0004]
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a sewing machine having a threading device with good operability, in which simultaneous operation of both hands of a user is not essential at the time of threading. To be.
[0005]
[Means for Solving the Problems]
The sewing machine according to the present invention is a sewing machine having a needle bar having a needle pin to which a needle having an eye hole is attached, a needle bar arm holding the needle bar, and a threading device for passing a thread through the eye hole of the needle. The threading device is provided directly or indirectly on the needle bar, and is configured to hold a thread on the needle bar side and to hold a thread portion of the thread at a position away from the needle bar. A releasably provided thread gripper, and a rotatable thread guide body that is hung on a needle bar thread hooker and keeps the thread gripped by the thread gripper in a horizontal direction with the rotation. And a rotatable hook portion that can be inserted into the eye of the needle. With the rotation, the hook portion is inserted into the eye of the needle to be in an engagement position where the hook can be engaged with the thread. With the rotation of the thread, the hook part with the thread engaged is disengaged from the eye of the needle, and the thread passes through the eye of the needle. A hook portion of the threading hook body and a cam portion that operates to release the gripping of the thread portion of the thread gripping portion when the hook portion is in the initial stage of the forward rotation and rotates in the reverse direction. And an operation lever section for interlocking the rotation of the thread guide body, the rotation of the threading hook body, the rotation of the threading hook body in the opposite direction, and the operation of the cam section.
[0006]
When the user operates the operation lever section, the rotation of the thread guide body, the rotation of the threading hook body, the rotation of the threading hook body in the opposite direction, and the operation of the cam section are automatically performed. The thread is automatically passed through the eye. In particular, since the operation of the cam portion releases the gripping action of the thread gripping portion, the thread is satisfactorily hooked on the hook portion.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the sewing machine of the present invention, at least one of the following forms can be adopted.
[0008]
A threading rod rotatably provided on the needle bar arm for holding the threading hook, and a thread guide in a direction opposite to the threading hook in conjunction with the threading hook with the rotation of the threading bar. And a gear mechanism for rotating the gear. In this case, the threading rod and the thread guide are rotated in directions opposite to each other by rotating the threading rod about the axis of the threading rod in accordance with the operation of the operation lever. Can be adopted in which the hook portion is inserted into the eye of the needle. The rotation of the threading hook body and the rotation of the thread guide body can be synchronized. -It is possible to adopt a mode having a speed increasing mechanism that makes the rotation speed of the thread guide body for keeping the yarn along the horizontal direction faster than the rotation speed of the threading hook body. In this case, since the rotation speed of the thread guide body is secured, the thread guide body at the initial position before the rotation can be kept as far as possible from the position of the needle, which can contribute to widening the space near the needle. .
[0009]
A mode in which a cam follower for releasing the gripping of the thread gripping portion is provided can be adopted. In this case, the cam portion has a cam surface on which the cam follower travels and which releases the gripping of the thread gripping portion with the travel. Therefore, with the operation of the operation lever portion, the cam follower is operated along the cam surface to release the gripping action of the thread gripping portion, thereby releasing the thread gripping by the thread gripping portion.
[0010]
When the operation lever portion is operated, a mode in which a rotation cam portion that rotates the hook portion of the threading hook body in the threading direction in conjunction with the operation can be adopted. In this case, when the operation of the operation lever portion is released, a spring can be provided which reverses the rotation cam portion to rotate the hook portion of the threading hook body in the reverse direction to return to the initial position.
The thread gripper can be configured to include a set of clamping members for clamping the thread and a biasing member such as a spring for biasing the clamping member in the clamping direction. In this case, the holding action by the holding member is released by the cam action of the cam portion, and the holding release action is performed.
[0011]
It is preferable that the thread hooking height of the needle bar thread hooking section and the thread hooking height of the thread gripping section are substantially the same. In this case, it is advantageous to keep the thread in a state before being hooked on the hook portion along the horizontal.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings. FIG. 1 shows the initial position of the threading device. FIG. 2 shows the progress of the operation of the threading device. FIG. 3 shows the final stage of the operation of the threading device. FIG. 4 shows the main structure of the threading device. FIG. 5 shows a plan view of the threading hook body 13. FIG. 6 is a perspective view of the cam portion 21 for releasing the gripping by the thread gripping portion 25. FIG. 7 shows the vicinity of the arc groove of the cam 21. FIG. 8 shows the vicinity of the straight groove of the cam 21. FIG. 9 shows a plan view of the state shown in FIG. FIG. 10 shows a plan view of the state shown in FIG. FIG. 11 shows a plan view of the state shown in FIG. FIG. 12 is a diagram showing a state viewed from the arrow X12 direction in FIG. FIG. 13 shows a state where the hook portion 20 is inserted into the eye 7A of the needle 7.
[0013]
In this embodiment, as shown in FIG. 1, the needle bar arm 1 is swingably attached to a machine frame (not shown) of a household sewing machine. The needle bar arm 1 has portions 1a, 1b, 1c, and 1d. A vertically long needle bar 2 is provided so as to be able to reciprocate up and down via a needle bar holder 3 by a crank mechanism 60 driven by an upper shaft 50 rotatably arranged in the machine frame of the sewing machine. A stopper 4 having a stopper portion 4A is mounted in a central region of the needle bar 2 in the height direction. The needle bar holder 3 is arranged below the stopper 4. A needle pin 5 having a screw 5c is attached to the lower end of the needle bar 2. The needle stay 5 is provided with a needle bar thread hooking section 6 for hanging a thread 24 as an upper thread. A needle 7 is detachably fixed to the needle stay 5.
[0014]
A vertical axis type threading rod 9 parallel to the needle bar 2 is attached to the portions 1a and 1c of the needle bar arm 1. The threading rod 9 is provided to be vertically movable with respect to the needle bar arm 1. The threading rod 9 is provided on the needle bar arm 1 so as to be rotatable around its axis P1. The threading body 8 has portions 8f and 8h. The threading body 8 is attached to the threading rod 9 so as to be able to move up and down by fitting the parts 8f and 8h with the threading rod 9. On the upper part of the threading body 8, a rotary cam portion 8A having a groove cam shape spirally is formed. The rotating cam portion 8A has a lower end 8A1 and an upper end 8A2. The threading body 8 has an operation lever portion 8B below the lower portion thereof, which is pressed by a user's fingertip.
[0015]
A rotation pin 10 as a rotation operation element is fixed to an intermediate region of the threading rod 9 in the axial direction so as to be orthogonal to the threading rod 9. One end 10h of the rotation pin 10 can abut on the stopper portion 4A of the stopper 4, and the other end 10m of the rotation pin 10 can abut on the spiral rotation cam portion 8A of the threading body 8. The length of the pivot pin 10 is set such that
[0016]
A coiled threading spring 11 that connects the seat 8x of the threading body 8 and the seat 1x of the portion 1d of the needle bar arm 1 is mounted. At the initial position before threading, the threading body 8 is lifted upward, that is, in the direction of the arrow Y1 by the threading spring 11. A coiled threading rod spring 12 is mounted between the rotation pin 10 of the threading rod 9 and a portion 8f of the threading body 8. The threading rod spring 12 urges the threading rod 9 downward, that is, in the direction of the arrow Y2, against the threading body 8 to push it down. Since the spring force of the threading rod spring 12 is stronger than the spring force of the threading spring 11, the rotation pin 10 is located at the lower end 8A1 of the groove cam portion 8A in the initial position shown in FIG. When the user pushes down the operating lever 8B of the threading body 8 with a fingertip downward, that is, in the direction of arrow Y1, the threading body 8 and the threading rod 9 move integrally as an initial operation and rotate as shown in FIG. The moving pin 10 contacts the stopper 4A of the stopper 4. At the point of contact as shown in FIG. 2, further lowering of the threading rod 9 is stopped. When the operation lever 8B of the threading body 8 is further pressed from the point of contact as described above, the threading body 8 moves further downward, that is, in the direction of the arrow Y2, and the portion 8f of the threading body 8 descends. As a result, the threading rod spring 12 starts to be contracted, and the rotating pin 10 moves along the rotating cam portion 8A of the threading body 8. As a result, the rotation pin 10 rotates around the axis P1, and the threading rod 9 rotates clockwise, that is, in the direction of the arrow K1 (see FIG. 9). When the user loosens the force applied to the operation lever portion 8B of the threading body 8, the threading rod spring 12 resiliently returns, and the rotating cam portion 8A of the threading body 8 acts as a cam to allow the threading rod 8 to move. 9 rotates counterclockwise around the axis P1 in the direction of arrow K2 (see FIG. 9), and the threading body 8 is integrated with the threading rod 9 and the arrow Y1 is formed by the spring force of the threading spring 11. The threading body 8 and the threading rod 9 are moved back to the initial position shown in FIG.
[0017]
As shown in FIG. 4, a threading hook 13 is fixed to the lower end of the threading rod 9. As shown in FIG. 9, the threading rod 9 and the threading hook 13 rotate integrally with the axis P1 in the directions of arrows K1 and K2. The hook portion 20 is fixed to the pair of plate portions 13x constituting the threading hook body 13 by crimping. A hook guide 27 is formed on the tip side of the plate portion 13x. As shown in FIG. 12, the hook portion 20 is thin enough to be inserted into the needle hole 7A of the needle 7, and has a locking hole 20m for locking the thread 24 and a tip inclined surface 20n.
[0018]
As shown in FIG. 5, the threading hook body 13 has a base 13D fixed to the lower end of the threading rod 9 and rotating integrally with the threading rod 9, and an arm 13A extending laterally from the base 13D. The arm 13A can be displaced in the direction of the arrow W4 with respect to the base 13D by the rotator 13t. An elongated hole 13B is formed in the arm 13A along the arm 13A. A one-way operation type, that is, a one-way type cam portion 21 slidably attached to the arm portion 13A is provided. The one-way cam portion 21 has a groove-shaped cam surface 22 into which a projecting portion 17A, which will be described later, functioning as a cam follower is movably fitted. As shown in FIG. 6, the cam surface 22 includes an arcuate groove 22A extending in an arc, a linear groove 22B extending in a straight line, a step 22C for preventing the protrusion 17A from rotating in the reverse direction, an arcuate groove 22A and the linear groove. And a switching position 22E for switching the position 22B. The cross-sectional shape of the arc groove portion 22A is as shown in FIG. As shown in FIG. 7, the arc groove portion 22A has a high flat surface 22A1, a low flat surface 22A3, and an inclined surface 22A2 formed between the flat surfaces. The cross-sectional shape of the straight groove 22B is as shown in FIG. As shown in FIG. 8, the straight groove portion 22B has a low flat surface 22B3 flush with the low flat surface 22A3 of the arc groove portion 22A, a high flat surface 22B1 slightly lower than the high flat surface 22A1 of the arc groove portion 22A, and between the two flat surfaces. It has an inclined surface 22B2 to be formed. The step between the high flat surface 22B1 of the straight groove portion 22B and the high flat surface 22A1 of the arc groove portion 22A becomes a step 22C for preventing the protrusion 17A from rotating in the reverse direction.
[0019]
In FIG. 9, a thread guide body 14 is attached to the lower end of the threading rod 9 so as to be able to idle around the axis P1 of the threading rod 9 in the directions of arrows M1 and M2. Therefore, the thread guide body 14 can rotate relative to the threading rod 9 in the opposite direction about the axis P1. The thread guide body 14 has a guide portion 14B for guiding the thread 24. An external gear 14A is integrally provided on the thread guide 14. The gear portion 14A is rotatable around the axis P1 of the threading rod 9.
[0020]
4, an auxiliary threading rod 15 is attached to the portions 8s and 8t of the threading body 8 so as to be rotatable at a position parallel to the threading rod 9. The auxiliary threading rod 15 has a longitudinal axis P2. An intermediate gear 16 is fixed to the lower end of the auxiliary threading rod 15. The intermediate gear 16 rotates about the axis P2. As shown in FIG. 4, the intermediate gear 16 has an externally toothed gear portion 16W, and further has an arm portion 16K extending in the lateral direction. The arm 16K has a fitting pin 16A having a protrusion 16A1. The fitting pin 16A of the intermediate gear 16 is displaceably fitted along the elongated hole 13B of the arm 13A of the threading hook body 13.
[0021]
A thread gripping plate 17 having a horizontal thread gripping surface 17r is attached to the lower end of the auxiliary threading rod 15. As shown in FIG. 4, the thread holding tray 17 is rotatable around the axis P2 of the auxiliary threading rod 15, and slides in the vertical direction, that is, the directions of arrows Y1 and Y2 along the auxiliary threading rod 15. It is possible to move. The thread gripping plate 17 has a downwardly projecting projection 17A functioning as a cam follower. An E-ring 18 is attached to the auxiliary threading rod 15. A coil-shaped thread gripping spring 19 is coaxially assembled with the auxiliary threading rod 15 between the E-ring 18 and the thread gripping dish 17. The thread gripping spring 19 constantly urges the thread gripping plate 17 downward, that is, in the direction of arrow Y2, in other words, in the thread gripping direction.
[0022]
The projection 17 </ b> A functioning as a cam follower protruding from a lower portion of the thread gripping plate 17 is urged by the spring force of the thread gripping spring 19 to contact the cam surface 22 of the cam portion 21. That is, as shown in FIG. 5, the protrusion 17A of the thread gripping plate 17 is fitted into the circular groove 22A or the straight groove 22B of the one-way cam 21 to pick up the uneven shape of the cam surface 22, and Accordingly, the thread gripping tray 17 moves up and down in the directions of arrows Y1 and Y2.
[0023]
The yarn gripping portion 25 according to the present embodiment can hold and hold a yarn, and is composed of an arm 16K of the intermediate gear 16 and a yarn gripping plate 17. That is, as can be understood from FIG. 4, since the thread gripping plate 17 is urged in the downward direction, that is, the direction of the arrow Y2 by the spring force of the thread gripping spring 19 as the urging member, the arm 16K of the intermediate gear 16 is When the thread portion 24c of the thread 24 is slid along the horizontal direction between the thread grasping surface 16r and the thread grasping surface 17r of the thread grasping dish 17, the thread portion 24c is moved to the thread grasping surface 16r of the arm 16K and the thread grasping dish 17r. 17 can be held with the thread holding surface 17r. Therefore, the arm 16K and the thread gripping plate 17 can function as a set of clamping members that clamp and grip the thread portion 24c of the thread 24.
[0024]
Details of the thread gripper 25 will be described with reference to FIGS. When the hook body 13 is on standby (FIGS. 1 and 9), as shown in FIG. 14, a predetermined gap (0.4 mm) is provided between the gripping surface 17r of the thread gripping plate 17 and the thread gripping surface 16r of the arm 16K. ) Is formed, and the thread portion 24c of the thread 24 is inserted. The thread 24 thus inserted is stopped by the projection 17z. At the time of threading (FIGS. 10 and 11), as shown in FIG. 15, the projection 17A driven by the cam surface 22 lowers the thread gripping plate 17, and moves the thread 24 to the gripping surface 17r of the thread gripping plate 17. It is clamped between the thread gripping surface 16r of the arm 16K. When the yarn is released, as shown in FIG. 16, the projection 17A driven by the cam surface 22 raises the yarn gripping plate 17 slightly higher than the state shown in FIG. Release from pinching between the surface 17r and the thread gripping surface 16r of the arm 16K.
[0025]
As shown in FIG. 9, the gear portion 16W of the intermediate gear 16 and the gear portion 14A of the thread guide body 14 mesh with each other to form a gear mechanism. Here, when the threading hook 13 rotates in the direction of arrow K1, the arm 13A of the threading hook 13 rotates in the direction of arrow K10 (= direction of arrow K1) about the axis P1. The slot 13B of 13A also rotates in the same direction. Therefore, the intermediate gear 16 rotates in the direction of the arrow R1 about the axis P2 via the fitting pin 16A and the arm 16K fitted in the elongated hole 13B. Then, the gear portion 14A of the thread guide body 14 rotates in the direction of the arrow R2 about the axis P1. That is, the thread guide body 14 rotates around the axis P1 in a direction (arrow M1 direction) opposite to the rotation direction of the threading hook body 13 (arrow K1 direction).
[0026]
The operation of the one-way cam portion 21 will be further described. That is, the projection 17A of the thread gripping tray 17 moves along the shape of the cam surface 22 of the cam portion 21, but the initial position of the projection 17A is at the initial position T1 as shown in FIG. When the threading hook body 13 starts rotating in the direction of arrow K1 about the axis P1, the arm 13A of the threading hook body 13 rotates around the axis P1 in the direction of arrow K10 (= direction of arrow K1). Then, the projection 17A of the thread gripping tray 17 travels along the cam surface 22 of the one-way cam portion 21. At this time, since the advance of the projection 17A is hindered by the step 22C at the boundary between the linear groove 22B and the arc groove 22A of the cam 21, the projection 17A automatically moves toward the linear groove 22B, that is, in the direction of arrow T2. Move along. At this time, the cam portion 21 can be appropriately displaced along the arrow W4 direction (see FIG. 5). Further, when the rotation of the threading hook body 13 in the direction of the arrow K1 is completed, the protrusion 17A has reached the switching position 22E of the cam surface 22, and the threading body 8 has reached the bottom dead center. Next, since the pressing operation of the operation lever portion 8B is released, the threading hook body 13 starts rotating in the opposite direction, that is, the direction of the arrow K2 (see FIG. 9) by the spring reaction force of the threading rod spring 12, and Accordingly, the protrusion 17A also moves to the arc groove 22A of the cam surface 22. As a result, the protrusion 17A travels up the inclined surface 22A2 of the arc groove portion 22A and reaches the high level surface 22B1 of the straight groove portion 22B via the high level surface 22A1. As a result, the protrusion 17A functioning as a cam follower is lifted in the direction of the arrow Y1, and the thread gripping plate 17 having the protrusion 17A is lifted in the direction of the arrow Y1 to cancel the gripping action of the thread 24 by the thread gripper 25. Is done.
[0027]
The case where the thread 24 is passed through the eye 7A of the needle 7 will be described. First, it is confirmed that the needle bar 2 is near the top dead center. Then, a thread 24, which is the upper thread passing through each guide section, is picked up from a thread spool (not shown) with a fingertip and guided to the needle bar thread hooking section 6 of the needle clamp 5 of the needle bar 2. Further, as shown in FIG. 1, the thread 24 is hooked on the guide portion 14B of the thread guide body 14. Further, the thread 24 is inserted into the thread grasping portion 25 constituted by the intermediate gear 16 and the thread grasping dish 17, whereby the thread portion 24c of the thread 24 is mounted on the thread grasping portion 25 in the state of FIG. As a result, the needle bar 2 side of the thread 24 is hooked on the needle bar thread hooking portion 6 of the needle clamp 5, and the thread portion 24c of the thread 24 that is separated from the needle bar 2 is, as shown in FIG. , Are held by the thread gripping portion 25 and the projection 17z so as to be free and not to come off, so that the action of a thread take-up spring (not shown) can be absorbed.
[0028]
As described above, the thread 24 is hooked on the needle bar thread hooking section 6 of the needle clamp 5, and the thread portion 24c of the thread 24 which is separated from the needle bar 2 is locked on the thread gripping section 25 in the state of FIG. In FIG. 1, the operator pushes down the operation lever 8B of the threading body 8 with a fingertip downward, that is, in the direction of arrow Y2. Then, in a state where the thread portion 24c is grasped by the thread grasping portion 25 in the state of FIG. 15, the threading body 8 descends in the direction of the arrow Y2 against the spring force of the threading spring 11. In this case, the entire threading device attached to the threading body 8 and the threading rod 9 descends substantially parallel to the needle bar 2.
[0029]
When the entire threading device is lowered to some extent, as shown in FIG. 2, the rotating pin 10 fitted into the threading rod 9 comes into contact with the stopper portion 4A of the stopper 4 of the needle bar 2, and the rotation pin 10 The above descent is hindered. However, when the user further depresses the operation lever 8B of the threading body 8 with a fingertip, the threading rod spring 12 pressed at the portion 8f of the threading body 8 is elastically contracted, and the spring force is applied to the threading rod spring 12. Is accumulated. Then, the threading body 8 further descends in the direction of the arrow Y2 against the spring force of the threading rod spring 12. At this time, the other end 10m of the threading rotation pin 10 is engaged with the rotation cam portion 8A of the threading body 8, and the cam groove (not shown) of the rotation cam portion 8A is spirally formed. Since the threading body 8 is lowered together with the rotating cam portion 8A, the rotating pin 10 is integrally rotated clockwise around the axis P1 of the threading rod 9 in the direction of arrow K1 (see FIG. 9). To rotate.
[0030]
Here, when the user further depresses the operation lever portion 8B of the threading body 8 with a fingertip, and when the threading body 8 reaches the bottom dead center, the height position of the hook portion 20 is set to the height of the needle hole 7A of the needle 7. The height position of the stopper 4 is set so as to be the same as the height position.
[0031]
As described above, when the user presses the operation lever portion 8B of the threading body 8 to push down the threading body 8 in the direction of the arrow Y1, the threading rod 9 together with the rotation pin 10 rotates clockwise, that is, in the direction of the arrow K1 ( (See FIG. 9). As a result, the threading hook body 13 fixed to the lower end of the threading rod 9 also rotates clockwise, that is, in the direction of arrow K1 (see FIGS. 9 to 11), and as shown in FIGS. The hook portion 20 of the body 13 is inserted into the needle hole 7A of the needle 7.
[0032]
On the other hand, the arm 13A continuously provided on the rear end side of the threading hook body 13 also rotates clockwise (arrow K10 = arrow K1 direction) about the axis P1. For this reason, the intermediate gear 16 is similarly rotated clockwise (direction of the arrow R1) by the fitting pin 16A and the arm 16K fitted into the elongated hole 13B of the arm 13A. Since the gear ratio between the gear portion 16W of the intermediary gear 16 and the gear portion 14A of the yarn guide body 14 is set to 1: 1, the gear portion 14 of the yarn guide body 14 is moved around the axis P1 as the intermediate gear. It rotates counterclockwise (direction of arrow R2) at the same rotation angle as 16.
[0033]
In this case, the speed of the intermediate gear 16 is increased. That is, in FIG. 11, a virtual line V1 connects the axis P1, which is the center of rotation of the threading rod 9 when it is not yet rotated, and the center of the fitting pin 16A. The virtual line V2 connects the axis P1 at the end of the rotation of the threading rod 9 and the center of the fitting pin 16A. Here, the rotation angle of the arm portion 13A of the threading hook body 13 that rotates about the axis P1 is A. The rotation angle of the arm 16K of the intermediate gear 16 that rotates about the axis P2 is B. As shown in FIG. 11, the rotation angle B is much larger than the rotation angle A (B> A). Therefore, the rotation angle of the arm 16K of the intermediate gear 16 is larger than that of the arm 13A of the threading hook body 13. Therefore, the gear portion 16W connected to the arm portion 16K of the intermediary gear 16 rotates slightly. That is, the speed of the gear 16W is increased. As described above, the speed of the gear portion 16W of the intermediate gear 16 is increased, and thus the speed of the gear portion 14A of the yarn guide body 14 that rotates in synchronization with the gear portion 16W is also increased. When the speed of the gear portion 14A of the thread guide body 14 can be increased as described above, the thread guide body 14 at the initial position can be moved as far as possible from the position of the needle 4 in the direction of the arrow M2, and the space near the needle 4 can be increased. And it is advantageous for sewing work.
[0034]
In this embodiment, the rotation of the gear portion 16W of the intermediate gear 16 causes the yarn guide body 14 having the gear portion 14A to rotate around the axis P1 in the counterclockwise direction, that is, in the direction of the arrow M1 (see FIG. 9). I do. When the rotation of the thread guide body 14 in the direction of the arrow M1 proceeds, the guide portion 14B of the thread guide body 14 is rotated from the start position S1 to the right rotation position S2 of the needle 7 (see FIGS. 11 and 3). Will be located at As a result, the thread 24 hung on the guide portion 14B of the thread guide body 14 is kept substantially horizontal at the front surface of the needle hole 7A of the needle 7, as shown in FIGS.
[0035]
In this embodiment, as described above, immediately after the thread 24 is kept substantially horizontal at the front surface of the needle hole 7A of the needle 7, the threading hook body 20 rotates in the direction of arrow K1 to the engagement position S3. May be reached. Alternatively, immediately after the threading hook body 20 rotates in the direction of the arrow K1 to reach the engagement position S3, the thread 24 hooked on the guide portion 14B of the thread guide body 14 is kept substantially horizontal. Is also good. Alternatively, the timing may be simultaneous.
[0036]
In this embodiment, in FIG. 12, when the yarn 24 is transported in the direction of the arrow M1, the yarn portion 24c is held by the holding members 17 and 16, and further, the other end (the yarn spool side) of the yarn 24 Since a tension is applied by a pretension spring (not shown), the hook portion 20 extends along a guide 27x formed by an inclined guide surface on the tip end side of a hook guide 27 of the threading hook body 13. The yarn 24 is guided to the hook portion 20 side along the tip inclined surface 20n. That is, it is possible to guide the thread 24 so as to face the locking hole 20m of the hook portion 20. In this case, as shown in FIG. 12, the hook portion 20 that has reached the engagement position S3 through the needle hole 7A of the needle 7 can be engaged with the thread 24.
[0037]
Next, in the state shown in FIG. 3, when the user releases his / her fingertip from the operation lever portion 8B of the threading body 8, the threading body 8 is rotated by the spring reaction force of the elastically contracted threading bar spring 12. It starts to rise in the direction of arrow Y1 together with cam portion 8A. Therefore, the threading hook 13 and the hook 20 are rotated counterclockwise around the axis P1 of the threading rod 9, that is, in the direction of the arrow K2 (see FIG. 4). 11), and the thread guide body 14 rotates in the direction of arrow M2. As a result, the hook portion 20 at the engagement position S3 retreats in the direction of the arrow K2, so that the hook portion 20 passes through the needle hole 7A and separates from the needle hole 7A in the direction of the arrow K2. In other words, the hook portion 20 in the state shown in FIG. 12 hooks the thread 24, and the hook portion 20 in the state where the thread 24 is hooked passes through the needle hole 7A of the needle 7 and separates from the needle hole 7A in the direction of arrow K2. .
[0038]
In the present embodiment, when the hook portion 20 on which the thread 24 is hooked rotates in the reverse direction (the direction of the arrow K2) as described above, as shown in FIG. Since the projection 17A of the engaged thread gripping plate 17 climbs the inclined surface 22B2 of the cam surface 22 and rides on the high-level surface 22B1, the thread gripping plate 17 is lifted in the arrow Y1 direction. As a result, the grasping of the thread portion 24c of the thread 24 by the thread grasping section 25 is released. Since the grip of the thread portion 24c of the thread 24 is automatically released in this manner, the hook portion 20 with the thread 24 hooked can easily pass through the needle hole 7A of the needle 7 and detach from the needle hole 7A. it can.
[0039]
Further, when the user releases his / her fingertip from the operation lever portion 8B of the threading body 8, the threading body 8 rises in the direction of arrow Y1 due to the spring reaction force of the threading rod spring 11, and the rotating pin 10 is moved. In order to lift, the threading rod 9 rises, and the hook portion 20 also starts to rise in the direction of the arrow Y1, but since the grip of the thread portion 24c of the thread 24 has been released, the thread 24 easily comes off the hook portion 20, In addition, the thread loop remains in the needle hole 7A without being affected by the rise of the threading body 8, so that the thread loop does not become small or come off. In this state, the thread 24 is passed through the eye 7A of the needle 7, and a thread loop of an appropriate size is formed behind the needle 7A.
[0040]
As described above, in the present embodiment, if the user operates the operation lever 8B, the rotation of the thread guide body 14, the rotation of the threading hook body 13 in the direction of the arrow K1, the threading hook body 13 The rotation in the direction of arrow K2, which is the opposite direction to the above, and the operation of the cam portion 21 are automatically performed, and the thread 24 is passed through the eye 7A of the needle 7. Then, after the thread 24 is passed through the eye 7A of the needle 7, the grip of the thread grip 25 is automatically released.
[0041]
Therefore, in the present embodiment, during threading, the thread 24 as the upper thread is hooked on the needle bar thread hooking section 6, and the thread portion 24 c of the thread 24 distant from the needle bar 2 is sent to the thread gripping section 25. If locked, the user can automatically pass the thread 24 through the eye 7A of the needle 7 by pressing the operation lever 8B in the direction of arrow Y2 with the fingertip. Therefore, the user only needs to operate the operation lever 8B with the fingertip, and unlike the above-mentioned prior art, simultaneous operation of both hands of the user is not essential, and the operability of the threading operation is improved. .
[0042]
In the present embodiment, since the height of the needle bar thread hooking section 6 and the height of the thread gripping section 25 for gripping the thread 24 are almost the same, it is possible to keep the thread 24 almost horizontally along the horizontal direction. Thus, it is possible to eliminate a mistake in hanging the thread 24. Further, the height position of the guide portion 14B of the thread guide body 14 is substantially the same as the height position of the needle bar thread hooking portion 6 and the height position of the thread gripping portion 25. It is more advantageous to keep along the direction.
[0043]
In the thread gripper 25, there is a timing at which the thread 24 is gripped and a timing at which the grip is released. The opening and closing of the thread gripping plate 17 is achieved by the unevenness of the cam surface 22 of the cam section 21, and the gripping of the thread gripping section 25 can be automatically released.
[0044]
Further, in this embodiment, the thread guide body 14 for keeping the thread 24 along the horizontal direction in order to hook the thread 24 to the hook portion 20 of the threading hook body 13 is provided in the rotation direction of the threading hook body 13. The structure in which the rotation is performed in the opposite direction is achieved by a gear mechanism using the intermediate gear 16. Use of such a gear mechanism is advantageous in achieving space saving of the entire threading device. Therefore, the present invention can be applied not only to a new type of sewing machine without impairing the external shape but also to the existing organic type sewing machine.
[0045]
The operation of releasing the grasping of the thread grasping portion 25 in the above embodiment is summarized as follows based on FIG. 17, the vertical axis indicates the level position of the protrusion 17A, and the horizontal axis indicates the position of the protrusion 17A on the cam surface 22. That is, on the horizontal axis, in the zone A, the zone B, the zone C, the zone D, the zone E, the zone F, and the zone H, the protruding portion 17A has a high flat surface 22B1 of the linear groove portion 22B and an inclined surface of the linear groove portion 22B, respectively. 22B2, the low flat surface 22B3 of the linear groove portion 22B, the low flat surface 22A3 of the circular groove portion 22A, the inclined surface 22A2 of the circular groove portion 22A, the high flat surface 22A1 of the circular groove portion 22A and the high flat surface 22B1 of the linear groove portion 22B. Show. The yarn portion 24c of the yarn 24 between the yarn gripping surface 16r and the yarn gripping surface 17r of the yarn gripping plate 17 is in the following state in each zone.
[0046]
Zone A: The thread gripper 25 is in the state shown in FIG. 14, and at this time, the thread portion 24 c of the thread 24 is not sandwiched between the thread gripping surface 16 r and the thread gripping surface 17 r of the thread gripping plate 17. Although it is located, it does not come off by engaging with the projection 17Z.
[0047]
Zone B: The thread gripping surface 17r of the thread gripping plate 17 gradually descends in the direction of the thread gripping surface 16r, and starts to clamp the thread portion 24c of the thread 24.
[0048]
Zone C: The thread gripper 25 is in the state shown in FIG. 15, and the thread portion 24c of the thread 24 is sandwiched between the thread gripping surface 16r and the thread gripping surface 17r of the thread gripping plate 17.
[0049]
Zone D: Same as Zone C
Zone E: The yarn gripping surface 17r of the yarn gripping plate 17 gradually starts to separate from the yarn gripping surface 16r, and the yarn portion 24c of the yarn 24 starts to be released.
[0050]
Zone F: The thread gripper 25 is in the state shown in FIG. 16, and the thread portion 24 c of the thread 24 is located between the thread gripping surface 16 r and the thread gripping surface 17 r of the thread gripping dish 17 more than in the zone A. In a non-pinched state.
[0051]
Zone G: a transition process to Zone G in the same state as Zone A.
[0052]
Zone H: Same as Zone A.
[0053]
In the zone A, the thread portion 24c of the thread 24 is located between the thread gripping surface 16r and the thread gripping surface 17r of the thread gripping dish 17 in a non-clamped state, but does not come off due to the projection 17Z. The thread hook can absorb the action of a thread take-up spring (not shown). Thus, there is no fear that the thread loop will be broken by the thread take-up spring after the thread loop is formed.
[0054]
The position, shape, moving direction, and the like where the members are provided in the above-described embodiment are not limited to the above-described embodiment alone, and can be appropriately changed. In the above-described embodiment, at the time of threading, the user is set to press the operation lever 8B downward with the fingertip, that is, in the direction of the arrow Y2. However, the present invention is not limited to this. Alternatively, the operation lever portion may be operated upward during threading. Each spring in the above-described embodiment is not limited to a coil shape, and may be a leaf spring or the like in some cases and may be appropriately selected. Further, the cam portion 21 and the hook body 13 may be formed integrally. Furthermore, the timing of holding / releasing shown in FIG. 17 is an example, and the timing is not limited to this. Note that the above-described embodiment is not limited to the embodiment described above and shown in the drawings, but can be implemented with appropriate modifications without departing from the scope of the invention. The description of the members described in this embodiment is an exemplification, and even a part thereof can be described in each claim.
[0055]
【The invention's effect】
According to the sewing machine of the present invention, when the user operates the operation lever section, the rotation of the thread guide body, the forward rotation of the threading hook body, the reverse rotation of the threading hook body, and the rotation of the cam section. The operation is performed, and the thread is passed through the eye of the needle. In particular, the cam portion operates to automatically release the gripping action of the thread gripping portion. Therefore, simultaneous operation with both hands of the user is not essential at the time of threading, and the operability of threading is improved. Moreover, since the thread is not gripped by the thread gripping portion when the threading hook body is on standby, the action of the thread take-up spring can be absorbed at the time of thread hooking. There is no.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an initial position of a threading device, in which a threading body has reached a rising end thereof.
FIG. 2 is a cross-sectional view showing the progress of the operation of the threading device.
FIG. 3 is a cross-sectional view showing a state in which the operation of the threading device is at the end of progress and the threading body has reached a lower end thereof.
FIG. 4 is a cross-sectional view showing a main structure of the threading device.
FIG. 5 is a configuration diagram showing a plan view of a threading hook body.
FIG. 6 is a perspective view of a main part of a cam unit for releasing grip by a thread grip unit.
FIG. 7 is a cross-sectional view of the vicinity of an arc groove portion of a cam portion.
FIG. 8 is a cross-sectional view of the vicinity of a straight groove portion of the cam portion.
FIG. 9 is a cross-sectional view showing an initial position of the threading device, in which the threading body has reached a rising end thereof, and is a plan view of the state shown in FIG. 1;
10 is a cross-sectional view showing the progress of the operation of the threading device, and is a plan view of the state shown in FIG. 2;
FIG. 11 is a cross-sectional view showing a state in which the operation of the threading device is at the end of the operation and the threading body has reached the lower end thereof, and is a plan view of the state shown in FIG. 3;
FIG. 12 is a configuration diagram when viewed from the direction of arrow X12 in FIG. 11;
FIG. 13 is a plan view showing a state where a hook is inserted into an eye of a needle.
FIG. 14 is a diagram illustrating a relationship between a thread tension tray and a thread gripping tray when the hook body is on standby.
FIG. 15 is a diagram showing a relationship between a thread tension tray and a thread gripping tray when hooking a hook body.
FIG. 16 is a diagram showing a relationship between a thread tension tray and a thread gripping tray when the hook body releases the thread.
FIG. 17 is a graph showing, in chronological order, the gripping / releasing action of the thread gripping portion, and the height of a protrusion serving as a cam portion.
[Explanation of symbols]
In the drawing, 1 is a needle bar arm, 2 is a needle bar, 4 is a stopper, 4A is a stopper portion, 6 is a needle bar thread hooking portion, 7 is a needle, 7A is a needle hole, 8 is a threading body, and 8A is a rotation. A cam portion, 8B is an operation lever portion, 10 is a rotation pin, 11 is a threading spring, 12 is a threading bar spring, 13 is a threading hook, 14 is a thread guide, 16 is an intermediate gear, and 16A is a fitting. Pin, 17 is a thread gripping plate, 17A is a protrusion (cam follower), 19 is a thread gripping spring, 20 is a hook, 21 is a cam, 22 is a cam surface, 22A is an arc groove, 22B is a straight groove, 24 Denotes an upper thread, 25 denotes a gripper, and 27 denotes a hook guide.

Claims

In a sewing machine having a needle bar having a needle pin to which a needle having an eye is attached, a needle bar arm holding the needle bar, and a threading device for passing a thread through the eye of the needle, the threading device includes: A needle bar thread hooking portion provided directly or indirectly on the needle bar to hook a thread located on the needle bar side, and a thread portion of the thread at a position away from the needle bar can be gripped and released. And a thread guide body rotatably provided, hung on the needle bar thread hooking section, and keeping the thread gripped by the thread gripping section in a horizontal direction with the rotation. And a hook portion rotatably provided, which can be inserted into the eye of the needle, and the hook portion is inserted into the eye of the needle along with the rotation so as to be in an engagement position capable of engaging with the thread. With the rotation in the direction, the hook portion in a state where the thread is engaged is disengaged from the eye of the needle, and the thread is inserted into the eye of the needle. A threading hook that passes through the threading hook, and releases the grip of the thread portion of the thread gripping part when the hook portion of the threading hook is in the initial stage of forward rotation and when rotating in the reverse direction. And a control lever for interlocking the rotation of the thread guide, the rotation of the threading hook, the rotation of the threading hook in the opposite direction, and the operation of the cam. A sewing machine characterized in that:

2. The threading rod according to claim 1, wherein the threading rod is rotatably provided on the needle bar arm and holds the threading hook, and the threading interlocks with the threading hook as the threading rod rotates. A gear mechanism is provided for rotating the thread guide body in a direction opposite to the hook body to keep the thread along the horizontal direction, and by rotating the threading rod with the operation of the operation lever unit. A sewing machine that rotates the threading hook body and the thread guide body in directions opposite to each other.

3. A cam follower according to claim 1 or 2, further comprising a cam follower for releasing the gripping of the thread gripping portion, wherein the cam portion travels while the cam follower travels and releases the gripping of the thread gripping portion with the travel. A sewing machine characterized by having a surface.