JP3558206B2

JP3558206B2 - Sewing machine reverse stitch lever vibration suppression mechanism

Info

Publication number: JP3558206B2
Application number: JP36211498A
Authority: JP
Inventors: 榮一太田; 耕太郎宮崎; 和俊梅田; 裕之鈴木
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 1998-12-21
Filing date: 1998-12-21
Publication date: 2004-08-25
Anticipated expiration: 2018-12-21
Also published as: JP2000176189A

Description

【０００１】
【発明の属する技術分野】
本発明は、送り歯の送り駆動機構から送り調節機構と返し縫いレバー軸を介して返し縫いレバーに伝わる振動を抑制するミシンの返し縫いレバー振動抑制機構に関する。
【０００２】
【従来の技術】
従来、送り歯を送り駆動する送り駆動機構と、送り歯の送り方向を切換え可能な送り調節機構とを備えたミシンでは、送り調節機構が、送り駆動機構に機械的に連結された送り調節器を有し、その送り調節器に返し縫いレバー軸が連動連結され、作業者が返し縫いレバー軸に連結された返し縫いレバーを手で持って回動操作することで、返し縫いレバー軸を介して送り調節器を回動させて、送り歯の送り方向を切換えるように構成したものがある。
【０００３】
本出願人が出願した送り方向切換え装置（特公昭５９−３０４３８号参照）では、送り調節器が正送り制御面と逆送り制御面を有し、送り調節ダイヤルの調節軸に正送り制御面が係合すると送り歯を正送り可能な状態となり、調節軸に逆送り制御面が係合すると送り歯を逆送り可能な状態となる。通常、返し縫いレバーを操作しない状態では、返し縫いレバーと送り調節器は正送り位置に回動付勢されている。
【０００４】
作業者が返し縫いレバーを回動付勢力に抗して回動操作すると、返し縫いレバーと送り調節器が逆送り位置に切換わり、送り調節器の逆送り制御面が調節軸に係合する。実際、送り駆動機構の作動中、作業者が返し縫いレバー（送り調節器）を逆送り位置に保持することで、送り調節器の逆送り制御面が調節軸に係合した状態が維持され、送り歯を逆送りさせることが可能になる。また、作業者が返し縫いレバーを放すことで、返し縫いレバーと送り調節器が回動付勢力により回動して正送り位置に切換わり、送り調節器の正送り制御面が調節軸に係合する。
【０００５】
ところで、この種のミシンでは、返し縫いレバー軸と返し縫いレバーとを直接固着し連結したものが多い。例えば、本出願人が実用化したミシンでも、図１２、図１３に示すように、返し縫いレバー軸100 の端部が、操作部102aを有する返し縫いレバー102 の基端部分に内嵌され、返し縫いレバー101 に螺合された止めネジ103 の先端部分が、返し縫いレバー軸100 に形成された軸心方向に長いＶ溝101 に係合され、更には返し縫いレバー軸100 に圧接し、返し縫いレバー軸100 と返し縫いレバー102 とが直接固着されている。
【０００６】
【発明が解決しようとする課題】
返し縫いレバー軸と返し縫いレバーとを直接固着し連結した従来の構造では、送り調節機構の作動による振動が、送り駆動機構から送り調節機構と返し縫いレバー軸を介して返し縫いレバーにダイレクトに伝わるため、作業者が送り歯を逆送りさせる為に返し縫いレバーを手で持って操作する際、特にミシン（送り駆動機構）が高速作動していると、返し縫いレバーに伝わる振動を不快に感じるという問題がある。
【０００７】
従来、返し縫いレバーに伝わる振動を抑制するために、何らかの振動抑制対策を講じる必要性はあったが、その為の構造を、返し縫いレバー軸を介して送り調節器を操作遅れなく確実に回動させる返し縫いレバーの操作性を損なわないように、或いは、構造を複雑化せずに製作コスト的に有利になるように設けることは難しかったこともあり、振動抑制対策が殆ど講じられていないのが現状である。
【０００８】
本発明の目的は、返し縫いレバーに伝わる振動を確実に抑制でき、また、その振動抑制効果を、返し縫いレバーの操作性を損なわずにしかも簡単な構造で以て達成できるミシンの返し縫いレバー振動抑制機構を提供することである。
【０００９】
【課題を解決するための手段】
請求項１のミシンの返し縫いレバー振動抑制機構は、送り歯を送り駆動する送り駆動機構と、この送り駆動機構に機械的に連結された送り調節器を有し且つその送り調節器を回動して送り歯の送り方向を切換え可能な送り調節機構と、前記送り調節器に連動連結された返し縫いレバー軸と、この返し縫いレバー軸を介して送り調節器を回動させる為の返し縫いレバーとを備えたミシンにおいて、前記返し縫いレバー軸と返し縫いレバーとを連結する連結機構は、前記返し縫いレバー軸の端部を返し縫いレバーの基端部の孔に回転方向摺動自在に連結する回動連結部と、前記返し縫いレバー軸に固着され且つ返し縫いレバーの基端部分に沿って延び且つ返し縫いレバーの回動作動を返し縫いレバー軸に伝達するレバーガイドと、前記送り駆動機構から送り調節機構と返し縫いレバー軸を介して返し縫いレバーに伝わる振動を抑制する緩衝ゴム部材であって、前記レバーガイドの先端部分と返し縫いレバーとの間に設けられた緩衝ゴム部材とを有し、前記返し縫いレバー軸の端部を返し縫いレバーの基端部に返し縫いレバー軸の軸心方向に移動不能に連結することを特徴とするものである。
【００１０】
返し縫いレバーを回動操作すると、返し縫いレバー軸が回動し、それに連動して送り調節機構の送り調節器が回動し、送り歯の送り方向が切換えられる。送り駆動機構の作動による振動は、送り駆動機構から送り調節機構と返し縫いレバー軸を介して返し縫いレバーに伝わるが、特にミシン（送り駆動機構）が高速作動しているときでも、その振動を振動抑制機構のレバーガイドの先端部分と返し縫いレバーとの間に付設された緩衝ゴム部材により大幅に低減して抑制することができるため、返し縫いレバーを操作する作業者が返し縫いレバーに伝わる振動を不快に感じるという問題を解消することができる。
【００１１】
ここで、通常、作業者が返し縫いレバーを操作しない状態で、返し縫いレバーと送り調節器は正送り位置に回動付勢されて、送り歯を正送り可能な状態となり、作業者が返し縫いレバーを回動付勢力に抗して回動操作すると、返し縫いレバーと送り調節器が逆送り位置に切換わり、送り歯を逆送り可能な状態となるように構成されている。実際、送り駆動機構の作動中、作業者が返し縫いレバー（送り調節器）を逆送り位置に保持することで、送り歯を逆送りさせることが可能になるが、このとき、前記緩衝ゴム部材により、返し縫いレバーに伝わる振動を抑制し、その振動を作業者が不快に感じないという効果を発揮する。
【００１２】
ここで、返し縫いレバーの回動作動を緩衝ゴム部材を介して返し縫いレバー軸に伝達するように構成してあるため、返し縫いレバーに伝わる振動を確実に抑制できるとともに、その振動抑制効果を、返し縫いレバー軸を介して送り調節器を操作遅れなく確実に回動させる返し縫いレバーの操作性を損なわないようにして達成することができる。
【００１３】
【００１４】
また、返し縫いレバーを回動操作すると、その回動作動が緩衝ゴム部材とレバーガイドを介して返し縫いレバー軸に伝達され、返し縫いレバー軸が回動し、それに連動して送り調節器が回動し、送り歯の送り方向が切換えられる。つまり、送り駆動機構による振動を確実に抑制できるとともに、その振動抑制効果を、返し縫いレバーの操作性を損なわないように、しかも、簡単な構造で以て確実に達成することができる。その他請求項１と同様の作用を奏する。
【００１５】
請求項２のミシンの返し縫いレバー振動抑制機構は、請求項１の発明において、前記レバーガイドは、返し縫いレバーの基端部分の回動方向両側に位置する１対の規制部を有し、これら規制部に１対の緩衝ゴム部材を固着したことを特徴とするものである。尚、返し縫いレバーと１対の緩衝ゴム部材の間の隙間が殆どないようにするのが望ましい。従って、返し縫いレバーの回動作動を緩衝ゴム部材とレバーガイドを介して返し縫いレバー軸に確実に伝達することができる。その他請求項１と同様の作用を奏する。
【００１６】
請求項３のミシンの返し縫いレバー振動抑制機構は、請求項１の発明において、前記レバーガイドは、返し縫いレバーの基端部分に形成された回動軸心方向に平行な挿通孔に遊嵌状に挿通する軸部を有し、この軸部に筒状の緩衝ゴム部材を外嵌固着したことを特徴とするものである。返し縫いレバー挿通孔の内面と緩衝ゴム部材の間の隙間が殆どないようにするのが望ましい。従って、返し縫いレバーの回動作動を緩衝ゴム部材とレバーガイドを介して返し縫いレバー軸に確実に伝達することができる。その他請求項１と同様の作用を奏する。
【００１７】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら説明する。
本実施形態は、加工布を正送りと逆送りとに切換え可能で、その加工布に２列縫いを施せる２本針ミシンに本発明を適用した場合の一例である。
【００１８】
図１、図２に示すように、ミシンＭは、ベッド部１ａと脚柱部１ｂとアーム部１ｃと頭部１ｄとを構成するミシン機枠１（以下、機枠という）を有し、アーム部１ｃの内部に、ミシンモータ（図示略）により回転駆動される主軸２と、主軸２の下側に位置する針振り軸３とが回動可能に支持されている。針振り軸３の左端部に針棒台５が固着され、その針棒台５に、左右１対の縫針６（２本針）を下端部に装着した針棒４が上下動自在にガイド支持され、その針棒４は回転駆動される主軸２に連動して上下に往復駆動される。
【００１９】
ベッド部１ａには下軸７が回転自在に支持され、その下軸７はタイミングベルト８を介して主軸２に連動して回転駆動され、下軸７には送り歯９を送り駆動する送り駆動機構２０の偏心カム２２，３０が固着されている。また、ベッド部１ａには、下軸７の前側において水平送り軸２１が回動可能に支持され、その右端部に揺動腕１０が固着され、前記偏心カム２３，３０に対応する部位に揺動腕２７，２８が固着されている。
【００２０】
一方、針振り軸３の右端部に揺動腕１１が固着され、この揺動腕１１と水平送り軸２１に固着された揺動腕１０がリンク部材１２で連結され、水平送り軸２１が往復回動されると、揺動腕１０、リンク部材１２、揺動腕１１を介して揺動軸３が往復回動され、針棒台５とともに針棒４が前後に揺動駆動される。
【００２１】
前記送り駆動機構２０について、図２、図３を参照して説明する。
下軸７に固着された偏心カム２２にカム抱擁部材２３が回転自在に外嵌され、カム抱擁部材２３のアーム部２３ａの先端部に、ピン２４を介して左右１対の駒４４が連結されている。一方、ベッド部１ａには、下軸７と水平送り軸２１の間に摺動溝部体４３が回動可能に支持され、その摺動溝部体４３に形成された摺動溝４３ａに駒４４が係合し移動自在にガイドされている。
【００２２】
駒４４にはピン２４を介してリンク２６の一端部が連結され、リンク２６の他端部は水平送り軸２１に固着された揺動腕２７に連結されている。水平送り軸２１の左端部に固着された揺動腕２８には後方へ延びる水平送りアーム２９が連結され、その水平送りアーム２９に送り歯９が固定されている。即ち、下軸７とともに偏心カム２２が回転駆動されると、カム抱擁部材２３、ピン２４、駒４４、リンク２６、揺動腕２７等を介して水平送り軸２１が往復回動され、これにより、揺動腕２８、水平送りアーム２９を介して送り歯９が前後に往復駆動される。
【００２３】
一方、下軸７の左端部分に固着された偏心カム３０に２股部材３１が係合され、その２股部材３１に水平送りアーム２９が連結されている。即ち、下軸７が回転駆動されると、送り歯９は上記のように前後に往復駆動されるとともに、下軸７と一体的に回転する偏心カム３０、２股部材３１、水平送りアーム２９を介して上下に往復駆動され、送り歯９は略楕円軌道を描くように送り駆動される。
【００２４】
尚、水平送り軸２１が往復駆動されると、上述のように、針棒４も前後に揺動駆動されるが、その針棒４と送り歯９が同タイミングで前後に揺動するように、しかも、略針下位置の２本針６と送り歯９の前後送り量が同じになるように構成されており、加工布に２本針６を刺した状態で布送り可能になっている。
【００２５】
次に、送り歯９の送り方向を切換え可能で、且つ、送り歯９の送り量を調節可能な送り調節機構４０について説明する。
【００２６】
図２に示すように、タイミングベルト８の左側に、送り調節器４１が左右方向向きの水平軸４２を介して支承されている。この送り調節器４１の前面部は、前側からＶカットされた形状になっており、その前面上部に正送り制御面４１ａが形成され、前面下部に逆送り制御面４１ｂが形成されている。一方、前記摺動溝部体４３の右端部に揺動腕４５が固着され、この揺動腕４５と送り調節器４１がリンク４６により連結され、調節器４１が回動されると、それに連動して、リンク４６、送り腕４５を介して摺動溝部体４３が回動される。
【００２７】
ここで、送り調節器４１とともに摺動溝部体４３を回動させ、摺動溝部体４３の摺動溝４３ａの傾き即ち、摺動溝４３ａに係合する駒４４の移動方向を変化させることで、送り歯９の送り方向を、正送り方向と逆送り方向とに亙って切換えることができるとともに、その送り方向への送り量を摺動溝４３ａの傾きによって調節できるようになっている。勿論、これにより、針棒４の前後揺動タイミングも同時に切換えられ、揺動量も同時に調節される。
【００２８】
図１、図２に示すように、脚柱部１ｂの前側に送り調節ダイヤル４７が設けられ、調節ダイヤル４７から調節軸４８が後方へ延び、調節軸４８の後端部に送り調節器４１の正送り制御面４１ａが係合すると、送り歯９を正送り可能な状態となり、調節軸４８の後端部に送り調節器４１の逆送り制御面４１ｂが係合すると、送り歯９を逆送り可能な状態となる。
【００２９】
また、調節ダイヤル４７を回動操作すると、機枠１ａに螺合された調節軸４８が進退し、調節軸４８の後端部に正送り制御面４１ａが係合した際の、送り調節器４１つまり摺動溝部体４３の回転位置が変化するため、また、調節軸４８の後端部に逆送り制御面４１ｂが係合した際の、送り調節器４１つまり摺動溝部体４３の回転位置が変化するため、調節ダイヤル４７の回動量に応じて、正送り方向と逆送り方向への送り量を調節することができる。
【００３０】
さて、図２、図４〜図８に示すように、送り調節器４１を回動させる為に、送り調節器４１には、左右方向向きの返し縫いレバー軸５０が連動連結され、この返し縫いレバー軸５０の右端部分に、連結機構６０を介して返し縫いレバー５５の基端部分が連結され、その連結機構６０に、返し縫いレバー振動抑制機構７０の１対の緩衝ゴム部材７１が設けられている。
【００３１】
返し縫いレバー軸５０は機枠１ａに回動自在に支持され、返し縫いレバー軸５０の左端部分に腕部材５１が固着され、その腕部材５１がリンク５２を介して送り調節器４１に連結されている。また、返し縫いレバー軸５０の長さ方向中央部分に腕部材５３が固着され、その腕部材５３の先端部に引張りコイルバネ５４の上端部が連結されている。
【００３２】
引張りコイルバネ５４の下端部は機枠１ａに連結され、この引張りコイルバネ５４の付勢力により、返し縫いレバー軸５０が左側面視にて時計回り方向に回動付勢されるとともに、腕部材５１とリンク５２を介して、送り調節器４１が左側面視にて反時計回り方向に回動付勢され、返し縫いレバー５５が操作されない状態では、送り調節器４１の正送り制御面４１ａが調節軸４８に係合し、送り歯９を正送り可能な状態になる。
【００３３】
返し縫いレバー５５は、脚柱部１ｂの前側に設けられた平面視矩形枠状の略水平な操作部５５ａと、この操作部５５ａの右端部から後方へ延びるレバー部５５ｂを有し、このレバー部５５ｂの基端部分が連結機構６０を介して返し縫いレバー軸５０に連結されている。
【００３４】
連結機構６０は、返し縫いレバー軸５０と返し縫いレバー５５を回動可能に連結する回動連結部６１と、返し縫いレバー軸５０に固着され且つ返し縫いレバー５５の基端部分に沿って延びるレバーガイド６２とを有する。回動連結部６１においては、返し縫いレバー軸５０の右端軸部５０ａが、返し縫いレバー５５のレバー部５５ｂの基端部に形成された孔５５ｃに摺動自在に内嵌されている。また、レバー部５５ｂの基端部は、返し縫いレバー軸５０に固着されたリング部材５６とレバーガイド６２に挟まれ、軸方向（左右方向）へは移動不能である。
【００３５】
レバーガイド６２は、返し縫いレバー５５のレバー部５５ｂの基端部分右側に位置する鉛直な鉛直板部６３と、鉛直板部６３の上下両端部から左側へ延びて、レバー部５５ｂの基端部分の回動方向両側に位置する１対の規制部６４を有する。レバーガイド６２の鉛直板部６３には小判孔６３ａが形成され、その小判孔６３ａに、返し縫いレバー軸５０の右端の小判型軸部５０ｂが嵌合され、更に、小判型軸部５０ｂの右端部からネジ部材６５が螺着されている。
【００３６】
返し縫いレバー振動抑制機構７０について説明する。
１対の緩衝ゴム部材７１は、返し縫いレバー５５のレバー部５５ｂと、レバーガイド６２の１対の規制部６４の間に殆ど隙間なく夫々介装されている。各緩衝ゴム部材７１は、レバー部５５ｂと反対側へ延びる軸状部７１ａを有し、例えば、その軸状部７１ａを規制部６４に形成された取付孔６４ａにレバー部５５ｂ側から圧入させて、規制部６４に固着されている。
【００３７】
返し縫いレバー５５が操作されない状態では、上記のように、引張りコイルバネ５４の付勢力により、送り調節器４１の正送り制御面４１ａが調節軸４８に係合して、送り歯９を正送り可能な状態となるが、作業者が操作部５５ａを手で持って返し縫いレバー５５を、引張りコイルバネ５４の付勢力に抗して下側へ回動操作すると、その回動作動が緩衝ゴム部材７１とレバーガイド６２を介して返し縫いレバー軸５０に伝達される。
【００３８】
即ち、返し縫いレバー軸５０は返し縫いレバー５５と一体的に回動し、それに連動して、腕部材５１とリンク５２を介して送り調節器４１が回動し、送り調節器４１の逆送り制御面４１ｂが調節軸４８に係合して、送り歯９を逆送り可能な状態にすることができる。送り駆動機構２０の作動中、作業者が返し縫いレバー５５を回動操作した状態に保持することで、送り歯９を逆送りすることが可能になるが、このとき、送り駆動機構２０の作動による振動が、送り駆動機構２０から送り調節機構４０と返し縫いレバー軸５０等を介して返し縫いレバー５５に伝わる。
【００３９】
従来では、送り駆動機構２０の作動による振動がダイレクトに返し縫いレバー５５に伝わるため、作業者が返し縫いレバー５０から受ける振動を不快に感じるという問題があったが、本案の返し縫いレバー振動抑制機構７０によれば、連結機構６０のガイドレバー６２に１対の緩衝ゴム部材７１を設けたので、特にミシンＭ（送り駆動機構２０）が高速作動しているときでも、これら緩衝ゴム部材７１により、返し縫いレバー５５に伝わる振動を大幅に低減して抑制することができるため、返し縫いレバー５５を操作する作業者が返し縫いレバー５５に伝わる振動を不快に感じるという問題を解消することができる。
【００４０】
更に、連結機構６０は、回動連結部６１とレバーガイド６２とを有し、返し縫いレバー５５の回動作動を１対の緩衝ゴム部材７１とレバーガイド６２を介して返し縫いレバー軸５０に伝達するように構成したので、送り駆動機構２０による振動を確実に抑制できるとともに、その振動抑制効果を、返し縫いレバー軸５０を介して送り調節器４１を操作遅れなく確実に回動させる返し縫いレバー５５の操作性を損なわないように、しかも、簡単な構造で以て確実に達成することができ、製作コスト的にも有利になる。
【００４１】
しかも、レバーガイド６２は、返し縫いレバー５５のレバー部５５ｂの基端部分の回動方向両側に位置する１対の規制部６４を有し、これら規制部６４に１対の緩衝ゴム部材７１を固着したので、返し縫いレバー５５の回動作動を緩衝ゴム部材７１とレバーガイド６２を介して返し縫いレバー軸５０に確実に伝達することができる。また、上側の規制部６４及び緩衝ゴム部材７１は省略可能であるが、上側の規制部６４及び緩衝ゴム部材７１を設けることにより、返し縫いレバー５５を上側へ回動操作することにより、返し縫いレバー軸５０を素早く且つ強制的に正送り状態に戻すことができる。即ち、返し縫いレバー５５を操作して、返し縫いレバー軸５０を逆送り状態にした後、返し縫いレバー５５を離すと、引張りコイルバネ５４によって返し縫いレバー軸５０が正送り状態に戻り、下側の規制部６４及び緩衝ゴム部材７１を返し縫いレバー５５が元の状態に戻る。しかしながら、その引張りコイルバネ５４による戻り時間よりも短時間で戻したい場合、また、何らかの原因で、返し縫いレバー軸５０が正送り状態に戻らなくなってしまった場合、返し縫いレバー５５を上側へ回動操作することにより、返し縫いレバー軸５０を素早く且つ強制的に正送り状態に戻すことができる。
【００４２】
次に、前記実施形態の連結機構６０の一部と返し縫いレバー振動抑制機構７０を変更した別実施形態について、図９〜図１２を参照して説明する。但し、前記実施形態と基本的に同じものには同一符号を付して重複説明を省略する。
【００４３】
連結機構６０Ａは、前記レバーガイド６２において規制部６４を省略した構造のレバーガイド６２Ａを有し、そのレバーガイド６２Ａの鉛直板部６３に左方へ延びる軸部材８１が固定的に設けられている。軸部材８１はその小径軸部８１ａを鉛直板部６３に形成された孔６３ｂに圧入状に内嵌して固定されている。一方、返し縫いレバー５５のレバー部５５ｂの基端部分には左右方向向きの挿通孔８０が形成され、この挿通孔８０に軸部材８１が遊嵌状に挿通されている。
【００４４】
返し縫いレバー振動抑制機構７０Ａの緩衝ゴム部材８２は筒状に構成され、その緩衝ゴム部材８２が軸部材８１に外嵌固着され、緩衝ゴム部材８２の左端部に形成された鍔部８１ｂにより抜け止めされている。軸部材８１に固着された緩衝ゴム部材８２と挿通孔８０の内面との隙間は殆どなく、作業者が操作部５５を手で持って返し縫いレバー５５を引張りコイルバネ５４の付勢力に抗して下側へ回動操作すると、その回動作動が緩衝ゴム部材８２とレバーガイド６２Ａを介して返し縫いレバー軸５０に伝達される。
【００４５】
このように、返し縫いレバー振動抑制機構７０Ａによれば、返し縫いレバー５５の回動作動を緩衝ゴム部材８２とレバーガイド６２Ａを介して返し縫いレバー軸５０に確実に伝達することができる。その他前記実施形態と同様の作用・効果を奏する。
【００４６】
尚、前記実施形態の返し縫いレバー振動抑制機構、連結機構は一例を示すものに過ぎず、本発明の趣旨を逸脱しない範囲において種々の変更を付加し、２本針ミシンに限らず、返し縫いレバーを操作することにより送り歯の送り方向を切換え可能に構成した種々のミシンに適用可能なことはいうまでもない。
【００４７】
【発明の効果】
請求項１のミシンの返し縫いレバー振動抑制機構によれば、送り調節器に連動連結された返し縫いレバー軸と、この返し縫いレバー軸を介して送り調節器を回動させる為の返し縫いレバーとを連結する連結機構にレバーガイドの先端部分と返し縫いレバーとの間に付設された緩衝ゴム部材を設け、この緩衝ゴム部材により、特にミシン（送り駆動機構）が高速作動しているときでも、その振動を大幅に低減して抑制することができるため、返し縫いレバーを操作する作業者が返し縫いレバーに伝わる振動を不快に感じるという問題を解消することができる。
【００４８】
更に、返し縫いレバー軸と返し縫いレバーとを連結する連結機構は、返し縫いレバー軸の端部を返し縫いレバーの基端部の孔に回転方向摺動自在に連結する回動連結部と、返し縫いレバー軸に固着され返し縫いレバーの基端部分に沿って延び且つ返し縫いレバーとの間に付設された緩衝ゴム部材とを有し、返し縫いレバーの回動作動を緩衝ゴム部材とレバーガイドを介して返し縫いレバー軸に伝達するように構成し、返し縫いレバー軸の端部を返し縫いレバーの基端部に返し縫いレバー軸の軸心方向に移動不能に連結したので、返し縫いレバーに伝わる振動を確実に抑制できるとともに、その振動抑制効果を、返し縫いレバー軸を介して送り調節器を操作遅れなく確実に回動させる返し縫いレバーの操作性を損なわずに達成することができる。しかも、簡単な構造で以て確実に達成できる。
【００４９】
【００５０】
請求項２のミシンの返し縫いレバー振動抑制機構によれば、請求項１と同様の効果を奏するが、レバーガイドは、返し縫いレバーの基端部分の回動方向両側に位置する１対の規制部を有し、これら規制部に１対の緩衝ゴム部材を固着したので、返し縫いレバーの回動作動を緩衝ゴム部材とレバーガイドを介して返し縫いレバー軸に確実に伝達することができる。
【００５１】
請求項３のミシンの返し縫いレバー振動抑制機構によれば、請求項１と同様の効果を奏するが、レバーガイドは、返し縫いレバーの基端部分に形成された回動軸心方向に平行な挿通孔に遊嵌状に挿通する軸部を有し、この軸部に筒状の緩衝ゴム部材を外嵌固着したので、返し縫いレバーの回動作動を緩衝ゴム部材とレバーガイドを介して返し縫いレバー軸に確実に伝達することができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るミシンの正面図である。
【図２】ミシン内部の斜視図である。
【図３】図２のIII −III 線断面図である。
【図４】振動抑制機構を含む返し縫いレバー等の平面図である。
【図５】図４の振動抑制機構を含む返し縫いレバー等の左側面図である。
【図６】図４のVI−VI線断面図である。
【図７】図４のVII −VII 線断面図である。
【図８】図５のVIII−VIII線断面図である。
【図９】別実施形態に振動抑制機構を含む返し縫いレバー等の平面図である。
【図１０】図９の振動抑制機構を含む返し縫いレバー等の平面図である。
【図１１】図１０のXI−XI線断面図である。
【図１２】従来技術に係る返し縫いレバーと返し縫いレバー軸の平面図である。
【図１３】図１２の係る返し縫いレバーと返し縫いレバー軸の左側面図である。
【符号の説明】
Ｍミシン
９送り歯
２０送り駆動機構
４０送り調節機構
４１送り調節器
５０返し縫いレバー軸
５５返し縫いレバー
６０，６０Ａ連結機構
６１回動連結部
６２，６２Ａレバーガイド
７０，７０Ａ返し縫いレバー振動抑制機構
７１，８２緩衝ゴム部材
８０挿通孔
８１軸部材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reverse stitch lever vibration suppressing mechanism of a sewing machine that suppresses vibration transmitted to a reverse stitch lever via a feed adjusting mechanism and a reverse stitch lever shaft from a feed drive mechanism of a feed dog.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a sewing machine provided with a feed driving mechanism for feeding and driving a feed dog and a feed adjusting mechanism capable of switching a feed direction of the feed dog, the feed adjusting mechanism is mechanically connected to the feed driving mechanism. A reverse feed stitch lever shaft is interlockedly connected to the feed adjuster, and an operator turns the reverse stitch lever connected to the reverse feed stitch lever shaft by hand, thereby performing a feed adjustment through the reverse stitch lever shaft. Are rotated to switch the feed direction of the feed dog.
[0003]
In the feed direction switching device (see Japanese Patent Publication No. 59-30438) filed by the present applicant, the feed adjuster has a forward feed control surface and a reverse feed control surface, and the forward feed control surface is provided on the adjustment axis of the feed adjustment dial. When the engagement is engaged, the feed dog can be forwardly fed, and when the reverse feed control surface is engaged with the adjustment shaft, the feed dog can be reversely fed. Normally, when the reverse stitch lever is not operated, the reverse stitch lever and the feed adjuster are biased to rotate to the forward position.
[0004]
When the operator turns the reverse stitch lever against the rotational urging force, the reverse stitch lever and the feed adjuster are switched to the reverse feed position, and the reverse feed control surface of the feed adjuster is engaged with the adjustment shaft. In fact, during operation of the feed drive mechanism, the operator holds the reverse stitch lever (feed adjuster) at the reverse feed position, so that the reverse feed control surface of the feed adjuster is engaged with the adjustment shaft, and It is possible to reverse the teeth. In addition, when the operator releases the reverse stitch lever, the reverse stitch lever and the feed adjuster are rotated by the rotational urging force to be switched to the normal feed position, and the normal feed control surface of the feed adjuster is engaged with the adjustment shaft. .
[0005]
By the way, in many kinds of sewing machines, a reverse stitch lever shaft and a reverse stitch lever are directly fixed and connected. For example, even in a sewing machine put to practical use by the present applicant, as shown in FIGS. 12 and 13, the end of the reverse stitch lever shaft 100 is fitted inside the base end portion of the reverse stitch lever 102 having the operation portion 102a, and the reverse stitch lever is provided. The tip end of a set screw 103 screwed into 101 is engaged with an axially long V-groove 101 formed in the reverse stitch lever shaft 100, and further presses against the reverse stitch lever shaft 100, and is pressed against the reverse stitch lever shaft 100. The reverse sewing lever 102 is directly fixed.
[0006]
[Problems to be solved by the invention]
With the conventional structure in which the reverse feed stitch lever shaft and the reverse feed stitch lever are directly fixed and connected, the vibration caused by the operation of the feed adjustment mechanism is directly transmitted from the feed drive mechanism to the reverse feed stitch lever via the feed adjustment mechanism and the reverse feed stitch lever shaft. When a user operates the reverse stitch lever by hand to reversely feed the feed dog, there is a problem that the vibration transmitted to the reverse stitch lever is uncomfortable, especially when the sewing machine (feed drive mechanism) is operating at a high speed.
[0007]
Conventionally, in order to suppress the vibration transmitted to the reverse feed stitch lever, it was necessary to take some measures to suppress the vibration.However, the structure for that purpose was surely rotated by the feed adjuster via the reverse feed stitch lever shaft without operation delay. It has been difficult to install the reverse stitch lever so as not to impair the operability of the reverse stitch lever, or to make it advantageous in terms of manufacturing cost without complicating the structure. It is.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a reverse stitch lever vibration suppressing mechanism for a sewing machine which can reliably suppress the vibration transmitted to the reverse stitch lever and achieve the vibration suppressing effect with a simple structure without impairing the operability of the reverse stitch lever. It is to provide.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a reverse stitch lever vibration suppressing mechanism for a sewing machine, comprising: a feed drive mechanism for feeding and driving a feed dog; and a feed adjuster mechanically connected to the feed drive mechanism. A feed adjusting mechanism capable of switching the feed direction of the feed dog, a reverse stitch lever shaft interlocked with the feed adjuster, and a reverse stitch lever for rotating the feed adjuster via the reverse stitch lever shaft. In the sewing machine, the connecting mechanism that connects the reverse stitch lever shaft and the reverse stitch lever is configured such that an end of the reverse stitch lever shaft slides in a rotation direction in a hole at a base end of the reverse stitch lever. In the present A rotary connecting portion to be connected, a lever guide fixed to the reverse stitch lever shaft and extending along a base end portion of the reverse stitch lever, and transmitting a rotation operation of the reverse stitch lever to the reverse stitch lever shaft; A buffer rubber member for suppressing vibration transmitted to the reverse stitch lever via the adjusting mechanism and the reverse stitch lever shaft, comprising a buffer rubber member provided between a tip portion of the lever guide and the reverse stitch lever, The end of the reverse stitch lever shaft is immovably connected to the proximal end of the reverse stitch lever in the axial direction of the reverse stitch lever shaft. It is characterized by the following.
[0010]
When the reverse stitch lever is operated to rotate, the reverse stitch lever shaft rotates, and in conjunction therewith, the feed adjuster of the feed adjusting mechanism rotates to switch the feed direction of the feed dog. Vibration caused by the operation of the feed drive mechanism is transmitted from the feed drive mechanism to the feed stitch lever via the feed adjustment mechanism and the feed stitch lever shaft. Even when the sewing machine (feed drive mechanism) is operating at high speed, the vibration is suppressed. Since the buffer rubber member provided between the end portion of the lever guide of the mechanism and the reverse stitch lever can greatly reduce and suppress the vibration, the operator operating the reverse stitch lever feels uncomfortable the vibration transmitted to the reverse stitch lever. Problem can be solved.
[0011]
Here, usually, in a state in which the operator does not operate the reverse feed stitch lever, the reverse feed stitch lever and the feed adjuster are urged to rotate to the normal feed position, so that the feed dog can be normally fed, and the operator pushes the reverse feed stitch lever. When the rotary operation is performed against the rotational urging force, the reverse feed stitch lever and the feed adjuster are switched to the reverse feed position, so that the feed dog can be reversely fed. In fact, during the operation of the feed drive mechanism, the operator can reverse feed the feed dog by holding the reverse stitch lever (feed adjuster) at the reverse feed position. In addition, the vibration transmitted to the reverse stitch lever is suppressed, and the vibration is effectively prevented from being discomforted by the operator.
[0012]
Here, since the rotation operation of the reverse feed stitch lever is configured to be transmitted to the reverse feed stitch lever shaft through the cushioning rubber member, the vibration transmitted to the reverse feed stitch lever can be reliably suppressed, and the effect of suppressing the vibration can be reduced. This can be achieved without impairing the operability of the reverse stitch lever for surely rotating the feed adjuster via the shaft without operation delay.
[0013]
[0014]
When the reverse operation of the reverse lever is performed, the rotational operation is transmitted to the reverse lever shaft via the cushioning rubber member and the lever guide, and the reverse lever shaft rotates. , The feed direction of the feed dog is switched. That is, the vibration by the feed drive mechanism can be surely suppressed, and the vibration suppressing effect can be surely achieved with a simple structure without impairing the operability of the reverse stitch lever. Other operations are the same as those of the first aspect.
[0015]
According to a second aspect of the present invention, in the reverse stitch lever vibration suppressing mechanism according to the first aspect, the lever guide has a pair of restricting portions located on both sides in the rotation direction of a base end portion of the reverse stitch lever. A pair of cushion rubber members are fixed to the portion. It is desirable that there is almost no gap between the reverse stitch lever and the pair of cushion rubber members. Therefore, the turning operation of the reverse stitch lever can be reliably transmitted to the reverse stitch lever shaft via the buffer rubber member and the lever guide. Other operations are the same as those of the first aspect.
[0016]
According to a third aspect of the present invention, in the reverse stitch lever vibration suppressing mechanism according to the first aspect, the lever guide is loosely fitted into an insertion hole formed at a base end portion of the reverse stitch lever and parallel to a rotation axis direction. It has a shaft portion to be inserted, and a cylindrical buffer rubber member is externally fitted and fixed to the shaft portion. It is desirable that there is almost no gap between the inner surface of the reverse stitch lever insertion hole and the cushioning rubber member. Therefore, the turning operation of the reverse stitch lever can be reliably transmitted to the reverse stitch lever shaft via the buffer rubber member and the lever guide. Other operations are the same as those of the first aspect.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present embodiment is an example of a case where the present invention is applied to a two-needle sewing machine that can switch a work cloth between forward feed and reverse feed and can perform two-row sewing on the work cloth.
[0018]
As shown in FIGS. 1 and 2, the sewing machine M includes a sewing machine frame 1 (hereinafter, referred to as a machine frame) including a bed 1 a, a pillar 1 b, an arm 1 c, and a head 1 d. A main shaft 2 rotatably driven by a sewing machine motor (not shown) and a needle swing shaft 3 located below the main shaft 2 are rotatably supported inside the portion 1c. A needle bar base 5 is fixed to the left end of the needle swing shaft 3, and a needle bar 4 having a pair of left and right sewing needles 6 (two needles) attached to the lower end thereof is supported on the needle bar base 5 so as to be vertically movable. The needle bar 4 is reciprocated up and down in conjunction with the main shaft 2 which is driven to rotate.
[0019]
A lower shaft 7 is rotatably supported by the bed portion 1a. The lower shaft 7 is driven to rotate in conjunction with the main shaft 2 via a timing belt 8, and a feed drive for feeding a feed dog 9 to the lower shaft 7. The eccentric cams 22, 30 of the mechanism 20 are fixed. A horizontal feed shaft 21 is rotatably supported on the front side of the lower shaft 7 in the bed 1a, and a swing arm 10 is fixed to the right end thereof. The moving arms 27 and 28 are fixed.
[0020]
On the other hand, a swing arm 11 is fixed to the right end of the needle swing shaft 3, and the swing arm 11 and the swing arm 10 fixed to the horizontal feed shaft 21 are connected by a link member 12, and the horizontal feed shaft 21 reciprocates. When rotated, the swing shaft 3 is reciprocated through the swing arm 10, link member 12, and swing arm 11, and the needle bar 4 is driven to swing back and forth together with the needle bar base 5.
[0021]
The feed drive mechanism 20 will be described with reference to FIGS.
A cam hugging member 23 is rotatably fitted to the eccentric cam 22 fixed to the lower shaft 7, and a pair of left and right pieces 44 is connected to the distal end of the arm portion 23 a of the cam hugging member 23 via a pin 24. ing. On the other hand, a sliding groove 43 is rotatably supported between the lower shaft 7 and the horizontal feed shaft 21 in the bed 1a, and a piece 44 is inserted into a sliding groove 43a formed in the sliding groove 43. It is engaged and movably guided.
[0022]
One end of a link 26 is connected to the piece 44 via a pin 24, and the other end of the link 26 is connected to a swing arm 27 fixed to the horizontal feed shaft 21. A horizontal feed arm 29 extending rearward is connected to a swing arm 28 fixed to the left end of the horizontal feed shaft 21, and the feed dog 9 is fixed to the horizontal feed arm 29. That is, when the eccentric cam 22 is driven to rotate together with the lower shaft 7, the horizontal feed shaft 21 is reciprocally rotated through the cam embrace member 23, the pin 24, the piece 44, the link 26, the swing arm 27, and the like. The feed dog 9 is reciprocated back and forth via the swing arm 28 and the horizontal feed arm 29.
[0023]
On the other hand, the forked member 31 is engaged with the eccentric cam 30 fixed to the left end portion of the lower shaft 7, and the horizontal feed arm 29 is connected to the forked member 31. That is, when the lower shaft 7 is driven to rotate, the feed dog 9 is reciprocated back and forth as described above, and the eccentric cam 30, the forked member 31, and the horizontal feed arm 29 which rotate integrally with the lower shaft 7. And the feed dog 9 is driven so as to draw a substantially elliptical orbit.
[0024]
When the horizontal feed shaft 21 is reciprocated, the needle bar 4 is also driven to swing back and forth as described above, and the needle bar 4 and the feed dog 9 are swung back and forth at the same timing. In addition, the two needles 6 in the substantially needle lower position and the front and rear feed amounts of the feed dog 9 are configured to be the same, and the cloth can be fed with the two needles 6 pierced into the work cloth. .
[0025]
Next, the feed adjusting mechanism 40 that can switch the feed direction of the feed dog 9 and can adjust the feed amount of the feed dog 9 will be described.
[0026]
As shown in FIG. 2, a feed adjuster 41 is supported on the left side of the timing belt 8 via a horizontal shaft 42 oriented in the left-right direction. The front portion of the feed adjuster 41 has a V-cut shape from the front side, and has a forward feed control surface 41a formed at the upper front portion and a reverse feed control surface 41b formed at the lower front portion. On the other hand, a swing arm 45 is fixed to the right end of the sliding groove 43, and the swing arm 45 and the feed adjuster 41 are connected by a link 46. When the adjuster 41 is rotated, the swing arm 45 is interlocked therewith. Thus, the slide groove 43 is rotated via the link 46 and the feed arm 45.
[0027]
Here, the sliding groove 43 is rotated together with the feed adjuster 41 to change the inclination of the sliding groove 43a of the sliding groove 43, that is, the moving direction of the piece 44 engaging with the sliding groove 43a. The feed direction of the feed dog 9 can be switched between the normal feed direction and the reverse feed direction, and the feed amount in the feed direction can be adjusted by the inclination of the slide groove 43a. Needless to say, this causes the forward and backward swing timing of the needle bar 4 to be simultaneously switched and the swing amount to be adjusted at the same time.
[0028]
As shown in FIGS. 1 and 2, a feed adjusting dial 47 is provided on the front side of the pillar 1 b, and an adjusting shaft 48 extends rearward from the adjusting dial 47, and a feed adjusting device 41 is provided at a rear end of the adjusting shaft 48. When the forward feed control surface 41a is engaged, the feed dog 9 can be forwardly fed, and when the reverse feed control surface 41b of the feed adjuster 41 is engaged with the rear end of the adjusting shaft 48, the feed dog 9 is moved backward. It is possible.
[0029]
When the adjustment dial 47 is rotated, the adjustment shaft 48 screwed to the machine frame 1a moves forward and backward, and the feed adjuster 41 moves when the forward feed control surface 41a engages with the rear end of the adjustment shaft 48. That is, since the rotational position of the sliding groove 43 changes, the rotational position of the feed adjuster 41, that is, the rotational position of the sliding groove 43 when the reverse feed control surface 41b is engaged with the rear end of the adjusting shaft 48 is changed. Because of the change, the feed amount in the normal feed direction and the reverse feed direction can be adjusted according to the amount of rotation of the adjustment dial 47.
[0030]
Now, as shown in FIGS. 2 and 4 to 8, in order to rotate the feed adjuster 41, the feed adjuster 41 is interlockedly connected with a reverse sewing lever shaft 50 oriented in the left-right direction. A base end portion of the reverse feed stitch lever 55 is connected to a right end portion of the reverse feed stitch lever 50 via a connection mechanism 60, and the connection mechanism 60 is provided with a pair of buffer rubber members 71 of the reverse feed stitch lever vibration suppression mechanism 70.
[0031]
The reverse stitch lever shaft 50 is rotatably supported by the machine frame 1a. An arm member 51 is fixed to the left end portion of the reverse stitch lever shaft 50. The arm member 51 is connected to the feed adjuster 41 via a link 52. . Further, an arm member 53 is fixed to a longitudinally central portion of the reverse stitch lever shaft 50, and an upper end portion of a tension coil spring 54 is connected to a distal end portion of the arm member 53.
[0032]
The lower end of the tension coil spring 54 is connected to the machine casing 1a, and the urging force of the tension coil spring 54 urges the reverse stitch lever shaft 50 to rotate clockwise in a left side view and links with the arm member 51. 52, the feed adjuster 41 is rotationally urged in the counterclockwise direction when viewed from the left side, and the forward feed control surface 41a of the feed adjuster 41 is attached to the adjustment shaft 48 when the reverse stitch lever 55 is not operated. The feed dog 9 is engaged, and the feed dog 9 can be forwarded.
[0033]
The reverse stitch lever 55 has a substantially horizontal operation portion 55a having a rectangular frame shape in plan view provided on the front side of the pillar 1b, and a lever portion 55b extending rearward from a right end of the operation portion 55a. A base end portion of 55 b is connected to a reverse stitch lever shaft 50 via a connecting mechanism 60.
[0034]
The connection mechanism 60 includes a rotation connection portion 61 that rotatably connects the reverse stitch lever shaft 50 and the reverse stitch lever 55, a lever guide 62 that is fixed to the reverse stitch lever shaft 50 and extends along a base end portion of the reverse stitch lever 55. Having. In the rotation connecting portion 61, the right end shaft portion 50 a of the reverse stitch lever shaft 50 is slidably fitted in a hole 55 c formed in a base end portion of the lever portion 55 b of the reverse stitch lever 55. Further, the base end of the lever portion 55b is sandwiched between the ring member 56 fixed to the reverse stitch lever shaft 50 and the lever guide 62, and cannot move in the axial direction (left-right direction).
[0035]
The lever guide 62 extends vertically to the left from the upper and lower ends of the vertical plate 63 and the vertical plate 63 positioned to the right of the base end of the lever 55b of the reverse stitch lever 55. It has a pair of restricting portions 64 located on both sides in the rotation direction. An oval hole 63a is formed in the vertical plate portion 63 of the lever guide 62. An oval shaft portion 50b at the right end of the reverse stitch lever shaft 50 is fitted into the oval hole 63a, and a right end portion of the oval shaft portion 50b. The screw member 65 is screwed.
[0036]
The reverse stitch lever vibration suppressing mechanism 70 will be described.
The pair of cushion rubber members 71 are interposed between the lever portion 55b of the reverse stitch lever 55 and the pair of regulating portions 64 of the lever guide 62 with almost no gap. Each cushion rubber member 71 has a shaft portion 71a extending to the opposite side to the lever portion 55b. For example, by pressing the shaft portion 71a into a mounting hole 64a formed in the regulating portion 64 from the lever portion 55b side. , Are fixed to the regulating portion 64.
[0037]
When the reverse stitch lever 55 is not operated, as described above, the forward feed control surface 41a of the feed adjuster 41 is engaged with the adjustment shaft 48 by the urging force of the tension coil spring 54, and the feed dog 9 can be fed forward. In this state, when the operator holds the operation unit 55a by hand and turns the reverse stitch lever 55 downward against the urging force of the tension coil spring 54, the turning operation is performed with the cushioning rubber member 71 and the lever. It is transmitted to the reverse sewing lever shaft 50 via the guide 62.
[0038]
That is, the reverse stitching lever shaft 50 rotates integrally with the reverse stitching lever 55, and in conjunction therewith, the feed adjuster 41 rotates via the arm member 51 and the link 52, and the reverse feed control surface of the feed adjuster 41. 41b is engaged with the adjusting shaft 48, so that the feed dog 9 can be set in a state in which the feed dog 9 can be fed back. While the feed drive mechanism 20 is operating, the operator can hold the reverse stitch lever 55 in a rotating state, so that the feed dog 9 can be fed in the reverse direction. The vibration is transmitted from the feed drive mechanism 20 to the feed stitch lever 55 via the feed adjusting mechanism 40 and the feed stitch lever shaft 50 or the like.
[0039]
Conventionally, since the vibration caused by the operation of the feed drive mechanism 20 is directly transmitted to the reverse stitch lever 55, there is a problem that the operator feels the vibration received from the reverse stitch lever 50 to be uncomfortable. According to this, since the pair of buffer rubber members 71 are provided on the guide lever 62 of the coupling mechanism 60, even when the sewing machine M (the feed drive mechanism 20) is operating at a high speed, the reverse stitch lever is provided by these buffer rubber members 71. Since the vibration transmitted to the reverse stitch lever 55 can be significantly reduced and suppressed, the problem that the operator operating the reverse stitch lever 55 feels uncomfortable with the vibration transmitted to the reverse stitch lever 55 can be solved.
[0040]
Further, the connection mechanism 60 has a rotation connection portion 61 and a lever guide 62, and transmits the rotation operation of the reverse sewing lever 55 to the reverse sewing lever shaft 50 via the pair of buffer rubber members 71 and the lever guide 62. With such a configuration, the vibration by the feed drive mechanism 20 can be reliably suppressed, and the vibration suppressing effect can be reduced by operating the reverse feed stitch lever 55 that surely rotates the feed adjuster 41 via the reverse feed stitch lever shaft 50 without operation delay. This can be reliably achieved with a simple structure without impairing the performance, and the production cost is also advantageous.
[0041]
Moreover, the lever guide 62 has a pair of restricting portions 64 located on both sides in the rotation direction of the base end portion of the lever portion 55b of the reverse sewing lever 55, and a pair of buffer rubber members 71 is fixed to these restricting portions 64. Therefore, the rotation operation of the reverse feed stitch lever 55 can be reliably transmitted to the reverse feed stitch lever shaft 50 via the buffer rubber member 71 and the lever guide 62. The upper regulating portion 64 and the cushion rubber member 71 can be omitted. However, by providing the upper regulating portion 64 and the cushion rubber member 71, the reverse stitch lever shaft 55 can be rotated upward to rotate the reverse stitch lever shaft. 50 can be quickly and forcibly returned to the normal feed state. That is, when the reverse stitch lever 55 is released after the reverse stitch lever shaft 50 is operated by operating the reverse stitch lever 55 and the reverse stitch lever 55 is released, the reverse stitch lever shaft 50 returns to the normal feed state by the tension coil spring 54, and the lower regulating portion 64 is provided. Then, the cushioning rubber member 71 is returned, and the sewing lever 55 returns to the original state. However, if it is desired to return in a shorter time than the return time by the tension coil spring 54, or if for some reason the reverse stitch lever shaft 50 does not return to the normal feed state, the reverse stitch lever 55 is rotated upward. Thereby, the reverse sewing lever shaft 50 can be quickly and forcibly returned to the normal feed state.
[0042]
Next, another embodiment in which a part of the coupling mechanism 60 of the above embodiment and the reverse stitch lever vibration suppressing mechanism 70 are changed will be described with reference to FIGS. However, the same components as those in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.
[0043]
The coupling mechanism 60A has a lever guide 62A having a structure in which the regulating portion 64 is omitted from the lever guide 62, and a shaft member 81 extending to the left is fixedly provided on a vertical plate portion 63 of the lever guide 62A. . The shaft member 81 has its small-diameter shaft portion 81a fitted and fixed in a hole 63b formed in the vertical plate portion 63 in a press-fit manner. On the other hand, an insertion hole 80 is formed in the base end portion of the lever portion 55b of the reverse stitch lever 55 in a left-right direction, and a shaft member 81 is loosely inserted into the insertion hole 80.
[0044]
The buffer rubber member 82 of the reverse stitch lever vibration suppression mechanism 70A is formed in a cylindrical shape, and the buffer rubber member 82 is externally fitted and fixed to the shaft member 81, and is prevented from falling off by a flange portion 81b formed at the left end of the buffer rubber member 82. Have been. There is almost no gap between the cushion rubber member 82 fixed to the shaft member 81 and the inner surface of the insertion hole 80, and the operator holds the operation portion 55 by hand and pulls the reverse stitch lever 55 against the urging force of the coil spring 54. When the turning operation is performed to the side, the turning operation is transmitted to the reverse stitching lever shaft 50 via the buffer rubber member 82 and the lever guide 62A.
[0045]
As described above, according to the reverse stitch lever vibration suppressing mechanism 70A, the turning operation of the reverse stitch lever 55 can be reliably transmitted to the reverse stitch lever shaft 50 via the buffer rubber member 82 and the lever guide 62A. Other operations and effects similar to those of the above-described embodiment are exhibited.
[0046]
It should be noted that the reverse stitch lever vibration suppressing mechanism and the coupling mechanism of the above embodiment are merely examples, and various changes are added without departing from the spirit of the present invention, and the reverse stitch lever is not limited to the two-needle sewing machine. Needless to say, the present invention can be applied to various sewing machines configured to be able to switch the feed direction of the feed dog by operating.
[0047]
【The invention's effect】
According to the reverse stitch lever vibration suppressing mechanism of the sewing machine of the first aspect, the reverse stitch lever shaft interlocked to the feed adjuster is connected to the reverse stitch lever for rotating the feed adjuster via the reverse stitch lever shaft. The coupling mechanism is provided with a cushioning rubber member attached between the tip of the lever guide and the reverse stitch lever. This cushioning rubber member greatly reduces vibration even when the sewing machine (feed drive mechanism) is operating at high speed. Therefore, the problem that the operator operating the reverse stitch lever feels uncomfortable with the vibration transmitted to the reverse stitch lever can be solved.
[0048]
Further, the connecting mechanism for connecting the reverse stitch lever shaft and the reverse stitch lever includes a rotary connecting portion that slidably connects an end portion of the reverse stitch lever shaft to a hole of the base end portion of the reverse stitch lever in a rotational direction. A buffer rubber member which is fixed and extends along the base end portion of the reverse stitch lever, and is provided between the reverse stitch lever and the buffer rubber member. Configured to communicate, Since the end of the reverse feed stitch lever shaft is connected to the base end of the reverse feed stitch lever so that it cannot move in the axial direction of the reverse feed stitch lever shaft, Vibration transmitted to the reverse feed stitch lever can be reliably suppressed, and the effect of suppressing the vibration can be achieved without impairing the operability of the reverse feed stitch lever that reliably rotates the feed adjuster without operation delay via the reverse feed stitch lever shaft. . Moreover, it can be reliably achieved with a simple structure.
[0049]
[0050]
According to the reverse stitch lever vibration suppressing mechanism of the sewing machine of the second aspect, the same effect as that of the first aspect is obtained, but the lever guide has a pair of regulating portions located on both sides in the rotation direction of the base end portion of the reverse stitch lever. Since the pair of buffer rubber members are fixed to these restricting portions, the turning operation of the reverse stitch lever can be reliably transmitted to the reverse stitch lever shaft via the cushion rubber member and the lever guide.
[0051]
According to the reverse stitch lever vibration suppression mechanism of the sewing machine of the third aspect, the same effect as that of the first aspect is obtained, but the lever guide is formed at the base end portion of the reverse stitch lever with an insertion hole parallel to the rotation axis direction. Since a cylindrical buffer rubber member is externally fitted and fixed to this shaft portion, the turning operation of the reverse stitch lever is performed on the reverse stitch lever shaft via the buffer rubber member and the lever guide. It can be transmitted reliably.
[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 perspective view of the inside of the sewing machine.
FIG. 3 is a sectional view taken along line III-III in FIG. 2;
FIG. 4 is a plan view of a reverse stitch lever and the like including a vibration suppressing mechanism.
FIG. 5 is a left side view of a reverse stitch lever and the like including the vibration suppressing mechanism of FIG. 4;
FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;
FIG. 7 is a sectional view taken along line VII-VII in FIG. 4;
8 is a sectional view taken along line VIII-VIII in FIG.
FIG. 9 is a plan view of a reverse stitch lever and the like including a vibration suppression mechanism in another embodiment.
FIG. 10 is a plan view of a reverse stitch lever and the like including the vibration suppressing mechanism of FIG. 9;
11 is a sectional view taken along line XI-XI in FIG.
FIG. 12 is a plan view of a reverse stitch lever and a reverse stitch lever shaft according to the related art.
FIG. 13 is a left side view of the reverse stitch lever and the reverse stitch lever shaft shown in FIG. 12;
[Explanation of symbols]
M sewing machine
9 feed dog
20 Feed drive mechanism
40 Feed adjustment mechanism
41 Feed controller
50 Reverse feed stitch lever axis
55 Reverse stitch lever
60, 60A coupling mechanism
61 Rotating connection
62, 62A Lever guide
70, 70A Reverse feed lever vibration suppression mechanism
71, 82 cushioning rubber member
80 insertion hole
81 Shaft member

Claims

A feed drive mechanism for feeding and driving the feed dog, and a feed adjustment mechanism having a feed adjuster mechanically connected to the feed drive mechanism and capable of rotating the feed adjuster to switch the feed direction of the feed dog And a reverse stitch lever shaft interlocked with the feed adjuster, and a reverse stitch lever for rotating the feed adjuster via the reverse stitch lever shaft.
A connection mechanism for connecting the reverse stitch lever shaft and the reverse stitch lever is provided with:
A pivotal connecting portion that connects the rotational direction sliding self standing ends of the reverse stitching lever shaft hole of the base end portion of the reverse stitching lever,
A lever guide fixed to the reverse stitch lever shaft, extending along a base end portion of the reverse stitch lever, and transmitting a rotation operation of the reverse stitch lever to the reverse stitch lever shaft;
A buffer rubber member that suppresses vibration transmitted from the feed drive mechanism to the feed stitch lever via the feed adjusting mechanism and the feed stitch lever shaft, and a buffer rubber member provided between a tip portion of the lever guide and the feed stitch lever. Has,
A reverse stitch lever vibration suppressing mechanism for a sewing machine, wherein an end of the reverse stitch lever shaft is connected to a base end of the reverse stitch lever so as to be immovable in an axial direction of the reverse stitch lever shaft .

2. The lever guide according to claim 1, wherein the lever guide has a pair of restricting portions located on both sides in the rotation direction of a base end portion of the reverse stitching lever, and a pair of cushion rubber members is fixed to these restricting portions. The reverse stitch lever vibration suppression mechanism of the described sewing machine.

The lever guide has a shaft portion that is loosely inserted into an insertion hole formed at a base end portion of the reverse stitching lever and parallel to a rotation axis direction, and a cylindrical cushion rubber member is externally mounted on the shaft portion. 2. The mechanism according to claim 1, wherein the lever is fitted and fixed.