JP3941079B2

JP3941079B2 - sewing machine

Info

Publication number: JP3941079B2
Application number: JP35134997A
Authority: JP
Inventors: 実伊藤
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 1996-12-25
Filing date: 1997-12-19
Publication date: 2007-07-04
Anticipated expiration: 2017-12-19
Also published as: JPH10235047A

Description

【０００１】
【発明の属する技術分野】
本発明は、ミシンの送り調節装置に関するものである。
【０００２】
【従来の技術】
従来よりもっとも基本的なミシンの送り量調節装置は、そのミシンで縫製可能な模様の布送り量を送り量設定操作部材により任意に調節するものであった。その基本構成は、図１６に示す様に、布を送る為の送り歯１と、送り歯１を往復動させる駆動腕２と駆動軸又は駆動軸に従動する回転軸に固定された駆動カム３と、駆動カム３により揺動する揺動腕４と、揺動腕４及び駆動腕２を介して送り歯１の作動量を制御する送り調節器５と送り調節器５を制御する送り量設定操作部材に一体又は連動する送りカム６により構成されており、従来技術として確立されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、ミシンに内蔵される模様の多様化に伴いボタンホールの左右縁縫い及びスーパー模様の模様が前進送りと後進送りの複合により形成されるものが現在では一般的になっており、伸縮性の布地にこれらの模様を縫うと（布の伸縮性により）前進送りと後進送りの送り効率の差が拡大されて形状くずれの問題が顕著となってきた。この為、スーパー模様及びボタンホールの左右縁縫いの前後送りのそれぞれ独立した縫製作業中に操作可能な補正微調節（前後送りのバランス調節）装置の必要性が生じてきた。この補正装置に求められる機能としては下記の如くである。
【０００４】
１・・・ボタンホールの左右縁縫いの前後送り量が調節可能（約０．２から１ｍｍ前後）で且つ、補正微調節（前後送りのバランス調節）が可能であること。またこの補正微調節はボタンホールの左右縁縫い以外の模様の前後送りに影響しないこと。
【０００５】
２・・・スーパー模様の前後送りの補正微調節（前後送りバランス調節）が可能であること。またスーパー模様以外の模様の前後送りに影響しないこと。
【０００６】
従来のボタンホールの左右縁縫いの微調節装置としては実公昭５８−１８８５６号公報があり、この微調節装置は左右縁縫いの前後送り量の調節と補正微調節は可能であるが、その公報第１図に示される軸１９と送り調節器１を送り調節ピン９が連結部材を介して係合している為、スーパー模様が並立しない機構である（スーパー模様は送り調節器が前後進約３ｍｍに相当する作動範囲を交互に揺動しなければならないが軸１９と送り調節ピン９の係合が前記揺動を阻害する為）また、この装置によればスーパー模様以外の他の模様の前後送り量にも影響がある。
【０００７】
実公昭５９−８６８７号公報における送り微調節装置においては左右縁縫いの微調節の影響がスーパー模様を含む他の模様の送りにも影響する構造であり、いいかえればボタンホールの縁縫いの前後微調節をすれば必ずスーパー模様の前後送りのバランスがくずれる為、次にスーパー模様を縫うときは前後送りバランス微調節が必然となり、その逆の場合も同様のことが発生する。
【０００８】
特公昭５８−３１９４６号公報に於ける送り調節機構においては、最後に縫ったボタンホールの左右縁縫いの補正した前後送り量がそのまま維持できる調節装置であり、他の模様縫いを行って後に再度ボタンホール縫いを行う場合でも以前と同じ送り量のものならば、再度試し縫いをしなくてもすぐに縫うことが可能で、他の模様の送り量にも影響しない構造となっている。又、その構造からスーパー模様の補正装置の並立も可能であると考えられる。
【０００９】
操作性および機能から考えると最善のものといえるが、その公報第３図の如くこの装置の成立の前提条件としてはボタンホールの形成に必要な左右縁縫いの前後送りのそれぞれの送りカムとかん止め縫いの送りカム（送り量０のカム）の３枚の積層カムが存在しており、為に前記積層カムのカムリフトを伝達される（カム積層方向に移動可能な）伝達体が必要である。前記送りカムの移動可能な伝達体は現在知られているミシンにおいては絶対必要なものではなく、よって伝達体が無い構成のミシンや伝達体はあるが移動しない構成のミシンには採用できないといった制約がある。
【００１０】
次に、スーパー模様の前後送り量の補正調節装置（バランス調節）としては、特公昭５６−５０９９７号公報に於ける送り制御装置が知られている。しかしながらこの調節装置はスーパー送りの補正調節重視の装置であり、ボタンホールの左右縁縫いの前後送りのバランス調節装置としては、完全なものとはいえない。その理由としては調節を行う操作部材がボタンホールを含むすべての模様の送り量設定操作部材と同一且つ同一操作（回転操作）の為、左右縁縫いの送り量を調節後、左右縁縫いの送り量バランス調節（補正）を行うということが出来ない。よってこの装置では送り量の調節重視となっており、補正調節は出来ずその替わりに送りカムの精度を高める構造となっている。
【００１１】
以上の如く現在知られている送り補正装置からいえることはスーパー模様とボタンホールの左右縁縫いの各補正装置の並立は技術上かなり難しいことであり、特公昭５８−３１９４６号公報に於ける装置においてはその並立は可能であるが、送りカムの伝達体の移動が必要という構成条件の限定といった課題がある。
【００１２】
本発明は、上述した問題点を解決するためになされたものであり、ボタンホールやスーパー模様など後進送りを含む模様に関する送り調節が容易なミシンを提供することを目的としている。
【００１３】
【課題を解決するための手段】
この目的を達成するために、請求項１記載のミシンは、布を送る為の送り歯と、前記送り歯を往復動させる駆動腕と、前記駆動腕を揺動させる揺動腕と、ミシンの駆動軸又は駆動軸に従動する回転軸に固定された前記揺動腕を揺動させるカムと、前記揺動腕を介して前記駆動腕の揺動角度を可変することで前記送り歯の送り量を調節する送り調節器と、前記送り調節器の傾斜角度を調節する送り量調節操作部材と、模様を選択するために操作される模様選択操作部材とを備えるものを対象として、特に、前進送りの送り量を制御する前進送りカムと、後進送りの送り量を制御する後進送りカムと、ボタンホールの縁縫いの後進送りの送り量を制御するボタンホール後進補助カムとを有する送りカムと、前記前進送りカム又は前記後進送りカムに接触可能なピンが設けられた制御板であって、前記前進送りカム又は前記後進送りカムと前記ピンとの接触により前記前進送りカム又は前記後進送りカムに追従して移動可能に支持され、その移動により前記送り調節器の傾斜角度を制御する制御板と、前記模様選択操作部材の操作により連動して回動するカム部を有する送り補助カムと、前記カム部に追従して揺動可能に支持され、その揺動を前記制御板に伝える補助送り板と、ミシンまたはミシンに固定されたフレームに回転可能に支持された偏心軸部を有するボタンホール送り微調節体と、前記ボタンホール送り微調節体の偏心軸部に回転可能に嵌合し且つ前記ボタンホール後進補助カムに追従して揺動可能に支持され、前記模様選択操作部材によりボタンホールの縁縫いの後進送りが選択されたときに、その揺動を前記補助送り板を介して前記制御板に伝えるボタンホール送り微調節レバーとを備え、前記模様選択操作部材の操作によりボタンホールの後進送りの縁縫いが選択され、且つ前記送り量調節操作部材がボタンホールの縁縫いで使用する送り量に調節されているとき、前記後進送りカムは、前記制御板に設けられた前記ピンと離間するように構成されている。
【００１４】
請求項１に記載のミシンにおいては、前記模様選択操作部材によりボタンホールの縁縫いの後進送りが選択されたときに、前記ボタンホール送り微調節レバーが前記ボタンホール後進補助カムに追従して揺動し、その揺動を前記補助送り板を介して前記制御板に伝える。このとき、前記送り量調節操作部材がボタンホールの縁縫いで使用する送り量に調節されている場合には、前記後進送りカムは、前記制御板に設けられた前記ピンと離間するように構成されているので、前記後進送りカムは送り量に影響しない。
【００１５】
又、請求項２に記載のミシンは、前記後進送りカムは、ボタンホールの縁縫いで使用する送り量には調節不能であるように送り量の調節可能下限が設定された構成とされている。
【００１６】
【発明の実施の形態】
以下、本発明を具体化した一実施の形態を図面を参照して説明する。尚、ボタンホールという言葉を必要に応じ適宜ＢＨと略す。
【００１７】
図１・図２・図３及び図４は実施の形態の機構構成図である。
【００１８】
図１に示すように、送り歯１は駆動腕２によって揺動されるように支持され、揺動腕４は駆動軸に固定されたカム３の動力を駆動腕２に伝達する。この揺動腕４は、送り調節器５の傾斜角度によって、送り歯１の前後方向の移動量を増減するように構成されている。図２は送り量最大位置状態図である。フレーム１０はミシン本体に固定されている（図示せず）。図３に示すように、フレーム１１は一端をフレーム１１に固定され他端にネジ部を有する軸１２及び軸１４を介してフレーム１０にナット１５で固定されている。模様選択軸１６はフレーム１０及び１１に回転可能に嵌合しており、止め輪１７によりフレーム１１に軸方向には固定されている。
【００１９】
模様選択操作部材１８は模様選択軸１６の一端に一体的に固定されている。ギヤ１９は模様選択軸１６にピン２０で固定されており模様選択操作部材１８と一体的に回転可能になっている。補助カム２１はその外周にギヤ１９と噛み合うギヤ部を有し、側面に溝カム部が形成されており、フレーム１０に固定された軸２２に回転可能に嵌合支持されている。補助送り板Ａ２４及び補助送り板Ｂ２５はフレーム１０に固定された段ネジ２６（図４の断面図Ｂ−Ｂ参照）に回転可能に支持されており、引きバネ２８で一方向に互いに引き合い、それぞれのストッパにより一体的に回転する様になっている。
【００２０】
図２、図４の断面図Ｂ−Ｂに示すように、補助送り板Ａ２４の軸部２４−ａは補助カム２１の溝カム部に挿入されていて、そのカムリフトを伝達される様になっている。ＢＨ送り微調節操作部材２９（図４参照）はその外周にギヤ部を有しフレーム１０の穴部に回転可能に嵌合しており、止め輪３０で軸方向に固定されている。外周にＢＨ送り微調節操作部材２９のギヤ部と噛み合うギヤ部を有し、且つ偏心軸部を持つＢＨ送り微調節体３１はフレーム１０に固定された軸３２に回転可能に支持されている。ＢＨ送り微調節レバー３４はＢＨ送り微調節体３１の偏心軸部に回転可能に嵌合して、止め輪３５で軸方向に固定されている。尚、ＢＨ送り微調節レバー３４の軸部３４−ａは補助送り板Ｂ２５の穴部２５−ａに嵌挿されている（図２参照）。
【００２１】
支持フレーム３６はミシン本体に固定されており、支持軸３６−ａは支持フレーム３６に固定されている。外周にＢＨ後進補助カム３９−ａを持ち、前進送りカム３７と後進送りカム３８を有する送りカム３９は支持軸３６−ａに回転可能に支持されている。送り量調節操作部材４０は支持軸３６−ａに回転可能支持され、その溝部４０−ａと送りカム３９の突部３９−ｂの嵌合により送り量調節操作部材４０と送りカム３９は一体的に回転可能になっている（図３参照）。制御板４１はその上端のＵ字部が支持軸３６−ａの溝に嵌挿し、下端は穴部４２−ａ部とミシン本体に固定された回転支点を持つ返し縫いレバー４２の穴部４２−ａに嵌挿され、上下方向に往復動可能に支持されている。
【００２２】
又、制御板４１は制御板４１に固定されたピン４１−ｄを介して送りカム３９の前進送りカム３７又は後進送りカム３８のカムリフトを伝達可能であり、常には引きバネ４３の付勢力によりピン４１−ｄを介して前進送りカム３７に向かって押圧され、その上下位置を一定に保っている。又、制御板４１はそのなかほどに穴部４１−ｃを有しており、穴部４１−ｃは補助送り板Ｂ２５のピン部２５−ｂと嵌合し、補助カム２１のカム部のカムリフトを制御板４１に伝えることが出来る。送り調節器５は引きバネ４４の付勢力によりその先端部は制御板４１に固定された軸４５と接しており、且つ、軸４５を介して制御板４１を上方向に押圧している（ピン４１−ｄの前進送りカムへの押圧力を助長している）。
【００２３】
尚、ＢＨ後進補助カム３９−ａとＢＨ送り微調節レバー３４の軸部３４−ｂは常には離れているが、ボタンホールの後進縁縫いの時の補助送り板Ａ２４の作動に伴い接して軸部３４−ｂがＢＨ後進補助カム３９−ａのカムリフトを伝達可能になっている（動作の詳細は後述）。
【００２４】
ボタンホール及びスーパー模様以外の送り調節の動作は図２に示す様に、送り量調節操作部材４０を特定の送り量位置に設定する為に回転させると、前進送りカム３７が連動回転して制御板４１は引きバネ４３の付勢力によりピン４１−ｄを介して前進送りカム３７のカム面に追従して送り量調節操作部材４０の送り量表示に対応する上下方向位置にて止まり、送り調節器５も引きバネ４４の付勢力により軸４５に追従して所定の送り量が発生する。
【００２５】
又、返し縫い（後進送り）は引きバネ４３・４４の付勢力に抗して返し縫いレバー４２を手動操作により押し下げることにより、制御板４１が下がりピン４１−ｄが後進送りカム３８のカムリフトを伝達し、これに送り調節器５の傾斜状態が追従することにより（送り量調節操作部材４０で設定した前進送り量と同量の）後進送り量が発生する。ただし、送り量調節操作部材４０が一定量以下の送り量に設定されている時は、それに対応した後進送り量ではなく一定の後進送りが発生する。理由は図８の前進及び後進送りカムのカムリフト図に示す様に後進送りカムのカムリフトは微小送り領域のカムリフトを意図的に一定のリフト位置でカット（一定の後進送り量以下には小さくならない様に）してある為である（カットの目的等の詳細は後述する）。以上がボタンホール及びスーパー模様以外の模様の送り量調節の操作及び動作である。
【００２６】
次に、ボタンホールの送り量調節の操作及び動作について詳述する。
【００２７】
まず、前進送りの縁縫い（便宜上右縁縫いとする）を行う場合は、送り量調節操作部材４０を意図する縁縫いの送り量（約０．２から１ｍｍ前後）にセットし、模様選択操作部材１８をボタンホールの右縁縫い位置にセットする為に回転させると、ギヤ１９が一体的に回転し、その外周にギヤ１９と噛み合うギヤ部を有する補助カム２１も連動して回転して図５に示す状態となる。一体的に回転可能になっている補助送り板Ａ２４及び補助送り板Ｂ２５はそのピン部２５−ｂ及び制御板４１の穴部４１−ｃを介して引きバネ４３の付勢力により一定方向に追従しており回転しようとする。
【００２８】
この時、補助送り板Ａ２４の軸部２４−ａは嵌挿されている補助カム２１の溝カム部のカム面２１−ａ（図５参照）に接することはない。これは制御板４１が（ピン４１−ｄが前進送りカム３７の最大カムリフトを伝達して）最大作動位置まで補助送り板Ａ２４及び補助送り板Ｂ２５を回転させても補助送り板Ａの軸部２４−ａがカム面に接しない様に補助カム２１の溝カムリフトを設定してある為である（図２参照）。よって、制御板４１は補助カム２１のカムリフトの影響を受けることなく、ピン４１−ｄの伝達した前進送りカム３７のカムリフト（送り量調節操作部材４０で設定した意図する縁縫いの送り量）によってその位置が決定され、送り調節器５もこれに追従して所定の前進送り量が発生する。尚、ＢＨ送り微調節レバー３４の軸部３４−ｂは（引きバネ４３の付勢力により制御板４１により持ち上げられてその位置を保っている）補助送り板Ｂ２５の穴部２５−ａと軸部３４−ａを介してＢＨ後進補助カム３９−ａから離れた位置を保っており、縁縫い前進送りの際はなんら影響をあたえない様になっている。
【００２９】
後進送りの縁縫い（便宜上左縁縫いとする）を行う場合は、送り量調節操作部材４０を意図する縁縫いの送り量にセットしたまま（前進縁縫いの時にセットしたまま）にしておき、模様選択操作部材１８をボタンホールの左縁縫い位置にセットする為に回転させると、ギヤ１９が一体的に回転し、その外周にギヤ１９と噛み合うギヤ部を有する補助カム２１も連動して回転して図６に示す状態となる。この時、補助カム２１が回転して補助カム２１の溝カムの傾斜面部に軸部２４−ａが接した時点（図７及び拡大図参照）からカムリフトは軸部２４−ａを介して補助送り板Ａ２４及びＢ２５を回転させようとするが、その方向は引きバネ４３がその付勢力で（ピン部２５−ｂ及び穴部４１−ｃを介して）補助送り板Ａ２４及びＢ２５を回転させようとする方向と逆方向となる。
【００３０】
補助送り板Ａ２４及びＢ２５を回転方向に一体的に固定している引きバネ２８の付勢力は引きバネ４３の付勢力よりも強く設定してある為、引きバネ４３が伸長することにより補助送り板Ａ２４及びＢ２５は補助カム２１のカムリフトに従い回転してピン部２５−ｂ及び穴部４１−ｃを介して制御板４１を押し下げる（図６：この時、前進送りカム３７のカム面とピン４１−ｄは離れる）。同時に、補助送り板Ｂ２５は穴部２５−ａ及び軸部３４−ａを介してＢＨ送り微調節レバー３４を回転させて軸部３４−ｂをＢＨ後進補助カム３９−ａのカム面に押圧させ、軸部３４−ｂが伝達したＢＨ後進補助カム３９−ａのカムリフトにより制御板４１の上下方向位置が決定され、送り調節器５がこれに追従して所定の後進送り量が発生する。
【００３１】
尚、補助カム２１のカムリフトは軸部３４−ｂをＢＨ後進補助カム３９−ａのカム面に確実に押圧させる為にカムリフトを大きくとってある為、軸部３４−ｂがＢＨ後進補助カム３９−ａに接してから更に軸部２４−ａはカム面により移動するが、引きバネ２８が伸長し、補助送り板Ａ２４及びＢ２５のストッパ間にスキマ（図６に示す）が生ずることにより各部品の破損・変形を起こさない様になっている。
【００３２】
ここで後進送りカム３８のカムリフトのカットについて説明する。図８に前後進送りカム３７・３８及びＢＨ後進補助カム３９−ａのカムリフトを示す。ＢＨ前後縁縫い送りで使用する微小領域のカムリフトをＡ−Ｂの範囲とすると、前進送りカム３７にはＡ−Ｂの範囲のカムリフトが形成されているが後進送りカム３８のカムリフトには存在しない様に意図的にカットして形成されている。かわりにＢＨ後進補助カム３９−ａにカットしたカムリフトが形成されている。
【００３３】
前述までの動作説明では縁縫い前進送りの送り量は前進送りカム３７のカムリフトにより決定され縁縫い後進送りの送り量はＢＨ後進補助カム３９−ａの（前進送りと対応した同一の）送り量で決定されており、基本的には前後縁縫いの送り量のバランスのとれた縫い目が形成されたことになる。
【００３４】
しかしながら前述した如く伸縮性の布を縫った時はこの限りではなく、縁縫い前進送りを基準にすると縁縫い後進送りが前進送りより大きい場合と小さい場合のバランスくずれが発生すると考えられる。この時、縁縫い前進送りに対して後進送りのバランスを補正しようとすると、後進送りを小さくするバランス補正をする場合は問題ないが、大きくするバランス補正をしようとした場合に、後進送りカム３８に微小領域のカムリフトＡ−Ｂの範囲が存在すると問題が発生することになる。
【００３５】
それは後進送りカム３８のＡ−Ｂのカムリフトを越えて後進送りを大きくするバランス補正をしようとしても、後進送りカム３８にＡ−Ｂの範囲にカム面が存在するとカム面がそれを阻害してしまう為である。よってバランス補正の微調節を行うためには、後進送りカムのカムリフトからＡ−Ｂ間のカムリフトをカット（除去）することが必然となり、かわりにＢＨ後進補助カム３９−ａでこれを補うことになる。以上が後進送りカムリフトをカットする理由である。
【００３６】
続いて、縁縫い前進送り量に対して縁縫い後進送り量のバランス調節の動作を詳述する（図９）。縁縫い前進送り量に対して後進送り量を変化させたい場合はＢＨ送り微調節操作部材２９を適量左（又は右）回転させると、そのギヤ部と噛み合うギヤを有するＢＨ送り微調節体３１（偏心軸部）が回転する。ＢＨ微調節レバー３４はその回転中心である偏心軸部中心の変位により僅かにその位置を変える。近似的に説明すると、ＢＨ後進補助カム３９−ａのカム面に押圧されている軸部３４−ｂを支点にして（偏心軸部の変位分）ＢＨ微調節レバー３４が回転して軸部３４−ａと穴部２５−ａを介して補助送り板Ａ２４及びＢ２５を回転させ、さらには制御板４１及び送り調節器５を微小量持ち上げ（又は押し下げ）て前進送り量との補正微調節（バランス調節）が可能となる。Ｄは後進送りを小さく調節出来る最大調節量であり、Ｅは大きく調節出来る最大調節量である。
【００３７】
最後にかん止め縫いを行う場合は、送り量調節操作部材４０を意図する縁縫いの送り量にセットしたまま（前進縁縫いの時にセットしたまま）にしておき、模様選択操作部材１８をボタンホールのかん止め縫い位置にセットする為に回転させるとギヤ１９が一体的に回転し、その外周にギヤ１９と噛み合うギヤ部を有する補助カム２１も連動して回転して、図１０に示す状態となる。この時、後進送りの縁縫いの時と同様に、補助カム２１が回転して補助カム２１の溝カムの傾斜面部に軸部２４−ａが接した時点からカムリフトは軸部２４−ａを介して補助送り板Ａ２４及びＢ２５を回転させようとするが、これは引きバネ４３がその付勢力で（ピン部２５−ｂ及び穴部４１−ｃを介して）補助送り板Ａ２４及びＢ２５を回転させようとする方向と逆方向となる。
【００３８】
補助送り板Ａ２４及びＢ２５を回転方向に一体的に固定している引きバネ２８の付勢力は引きバネ４３の付勢力よりも強く設定してある為、引きバネ４３が伸長することにより、補助送り板Ａ２４及びＢ２５は補助カム２１のカムリフトに従い回転してピン部２５−ｂ及び穴部４１−ｃを介して制御板４１を押し下げる（この時、前進送りカム３７のカム面とピン４１−ｄは離れる）。
【００３９】
同時に、補助送り板Ｂ２５は穴部２５−ａ及び軸部３４−ａを介してＢＨ送り微調節レバー３４を回転させて軸部３４−ｂをＢＨ後進補助カム３９−ａのカム面に接近させるが、軸部３４−ｂとＢＨ後進補助カム３９−ａのカム面は接しない。かん止め縫いの送り量（０）は前進送りカム３７のカムリフト及びＢＨ後進補助カム３９−ａのカムリフトのどちらでも決まらず、補助カム２１のカムフトによって決定される。これは送り量調節操作部材４０の意図する縁縫いの送り量が０でない為（本発明ではかん止め縫いの時に送り量調節操作部材４０を送り量０位置に設定しなくてもよい為）、必然的に前述の状態になる（ただし送り量調節操作部材４０を送り０の位置にした場合はこの限りではなく、軸部３４−ｂとＢＨ後進補助カム３９−ａは接することになる）。即ち、ＢＨやスーパー模様などのように前後の送りが１つの模様の中に混在する模様において、良好な送り調節をなし得ることができる。特に、ＢＨの左右縁縫いにおいては、その必要性が高い。
【００４０】
以上、前述した如く本発明によれば、移動可能な送りカムのカムリフトを伝達される伝達体を必要とせず、左右縁縫いの送り量の調節が可能で且つ、前後送りのバランスの補正微調節が可能となる。
【００４１】
【００４２】
【００４３】
そして、スーパー模様の前後送りの補正微調節（前後送りのバランス調節）装置との並立が可能なことを本発明の解決すべき課題の一つとしている為、詳述は避けるが本発明と並立可能なスーパー模様の補正微調節装置の実施の形態の簡単な説明及び説明図を添付する。
【００４４】
図１１、図１２に示すように、スーパー模様送りカム１０１はフレーム１０及びフレーム１１に固定支持された軸１０２に回転可能に支持され、駆動軸により常に回転している。ＳＳ伝達体１０３はフレーム１１に回転可能に支持されている。ＳＳ切替ホルダ１０４は支持フレーム３６に固定された軸１０５に回転可能に支持され、ＳＳ切替ホルダ１０４の軸部１０４−ａは送り量調節操作部材４０の溝カム部に嵌挿されている。ＳＳレバー１０６はＳＳ切替ホルダ１０４に固定支持された軸１０７に回転可能に支持され、ＳＳ連棹１０８によりＳＳ伝達体１０３と連結されている。制御レバー１０９は一端をＳＳレバー１０６に、他端を送り調節器５に固定された軸部１１０に連結されている。
【００４５】
引きバネ１１１は一端をミシン本体又は固定部に支持され、他端をＳＳ伝達体１０３に掛けられ、常にＳＳ伝達体１０３の伝達部１０３−ａをスーパー模様カム１０３のカム面から遠ざける方向に付勢支持されている。図１１はスーパー模様送り作動状態図である。本構成はスーパー模様と他の模様の切替を送り量調節操作部材４０の回転位置にて切り替える方式としており、送り量調節操作部材４０は送り量最大位置よりも更に回転した位置（スーパー模様位置）に設定されている。引きバネ１１１の付勢力は引きバネ４４のそれに比して極めて小さく設定されているので、引きバネ４４の付勢力によりスーパー模様送りカム１０１のカムリフトが送り調節器５に伝達され、スーパー模様送りが発生する。
【００４６】
図１３はスーパー模様送りが休止している状態を示す図である。
【００４７】
送り量調節操作部材４０を送り量０から最大送り量の範囲（スーパー模様の範囲外）に回転させると（図１３は送り量調節操作部材４０をいっぱいに回転させた送り量０の位置）、送り量調節操作部材４０の溝カムのカムリフトに従って、ＳＳ切替ホルダ１０４は軸１０５を回転中心として回転し、軸１０７の位置が変わる（軸１０７が持ち上げられる）。これに伴ってＳＳレバー１０６も持ち上げられて、まずその力はＳＳ連棹１０８を介してＳＳ伝達体１０３をカム１０１から遠ざける方向へ回転させる（引きバネ１１１の付勢力がこの作動を助長することになる）が、ＳＳ伝達体１０３の外形とフレーム１０に設けられたストッパー１０−ａが当接した時点で、ＳＳレバー１０６は制御レバー１０９を持ち上げる様に回転して、その作動を終了する。この終了時点で制御レバー１０９の溝部１０９−ａと送り調節器５の軸部１１０がその前後進最大送り範囲で干渉しない位置になっている。
【００４８】
スーパー模様の前後送りのバランス微調節については、ＳＳレバー１０６の回転中心である軸１０７の位置を微小量変化させることにより行う。詳述は避けるが、図１４においてＡ位置はＳＳ切替ホルダの軸部１０４−ａのスーパー模様時の適正切替位置である。Ｂ及びＣ位置は送り量調節操作部材４０に微調節範囲として設定した範囲である。図１５に微調節の作動を線図で示す。
【００４９】
【発明の効果】
以上説明したことから明かなように、請求項１および２記載のミシンで、特にボタンホールの送り積層カムおよび送りカムリフトの伝達体の移動が必要でない簡素な構成によりスーパー模様およびボタンホールなどのように前後の送りが１つの模様の中に混在する模様において、良好な送りの調節をなし得ることが可能となる。
【図面の簡単な説明】
【図１】実施の形態のミシンの送り歯に関わる装置の機構構成図である。
【図２】実施の形態のミシンが送り最大時の送り設定に関わる機構構成図である。
【図３】実施の形態のミシンの操作部材に関わる断面上面図である。
【図４】実施の形態のミシンの送り調節器に関わる機構構成図である。
【図５】実施の形態のミシンが前進送り縁縫い状態である時の送り設定に関わる機構構成図である。
【図６】実施の形態のミシンが後進送り縁縫い状態である時の送り設定に関わる機構構成図である。
【図７】実施の形態のミシンが前進送り縁縫いと後進送り縁縫いとの中間状態である時の送り設定に関わる機構構成図である。
【図８】実施の形態のミシンのカムリフトを説明する図である。
【図９】実施の形態のミシンにおける前後送り量のバランス調節の動作説明図である。
【図１０】実施の形態のミシンがかん止め縫い状態である時の送り設定に関わる機構構成図である。
【図１１】他の実施の形態のミシンの送り歯に関わる装置の機構構成図である。
【図１２】他の実施の形態のミシンの操作部材に関わる断面上面図である。
【図１３】他の実施の形態のミシンが送り量０で且つスーパー模様送りが休止している状態を示す図である。
【図１４】他の実施の形態のミシンにおける送り量調節部材の動作説明図である。
【図１５】他の実施の形態のミシンにおける微調節に関わる動作説明図である。
【図１６】従来のミシンの送り調節装置の機構構成図である。
【符号の説明】
１送り歯
２駆動腕
３駆動カム
４揺動腕
５送り調節器
６送りカム
１０フレーム
１１フレーム
１２軸
１４軸
１５軸
１６模様選択軸
１７止め輪
１８模様選択操作部材
１９ギヤ
２０ピン
２１補助カム
２２軸
２４補助送り板Ａ
２５補助送り板Ｂ
２６段ネジ
２８引きバネ
２９ＢＨ送り微調節操作部材
３０止め輪
３１ＢＨ送り微調節体
３２軸
３４ＢＨ送り微調節レバー
３５止め輪
３６支持フレーム
３７前進送りカム
３８後進送りカム
３９送りカム
４０送り量調節操作部材
４１制御板
４２返し縫いレバー
４３引きバネ
４４引きバネ
４５ピン
１０１スーパー模様送りカム
１０２軸
１０３ＳＳ伝達体
１０４ＳＳ切替ホルダ
１０５軸
１０６ＳＳレバー
１０７軸
１０８ＳＳ連棹
１０９制御レバー
１１０軸
１１１引きバネ[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a feed adjusting device for a sewing machine.
[0002]
[Prior art]
  Conventionally, the most basic sewing machine feed amount adjusting device arbitrarily adjusts the cloth feed amount of a pattern that can be sewn with the sewing machine using a feed amount setting operation member. As shown in FIG. 16, the basic configuration includes a feed dog 1 for feeding the cloth, a drive arm 2 for reciprocating the feed dog 1, and a drive cam 3 fixed to the drive shaft or a rotary shaft driven by the drive shaft. A swing arm 4 that swings by the drive cam 3, a feed adjuster 5 that controls the operation amount of the feed dog 1 via the swing arm 4 and the drive arm 2, and a feed amount setting that controls the feed adjuster 5. The feed cam 6 is integrated with or linked to the operation member, and is established as a conventional technique.
[0003]
[Problems to be solved by the invention]
  However, with the diversification of patterns built into the sewing machine, it is now common that the stitches of the left and right edges of the buttonhole and the super pattern are formed by a combination of forward feed and reverse feed. When these patterns are sewed on the fabric (due to the stretchability of the fabric), the difference in feed efficiency between forward feed and reverse feed is enlarged, and the problem of shape loss becomes prominent. For this reason, a need has arisen for a correction fine adjustment (balance adjustment for forward and backward feed) that can be operated during the independent sewing work of the front and rear feeds of the left and right edge stitches of the super pattern and the buttonhole. The functions required for this correction apparatus are as follows.
[0004]
  1. The front / rear feed amount of the left and right edge stitches of the buttonhole can be adjusted (about 0.2 to 1 mm), and correction fine adjustment (balance adjustment of the front / rear feed) is possible. Also, this correction fine adjustment should not affect the forward / backward feeding of the pattern other than the left and right edge stitches of the buttonhole.
[0005]
  2. Correction fine adjustment (front / rear feed balance adjustment) of super pattern front / rear feed is possible. Also, do not affect the forward / backward feeding of patterns other than super patterns.
[0006]
  As a conventional fine adjustment device for right and left edge sewing of a buttonhole, there is Japanese Utility Model Publication No. 58-18856, and this fine adjustment device can adjust the front and rear feed amount of the right and left edge sewing and correct fine adjustment. Since the shaft 19 and the feed adjuster 1 shown in FIG. 1 are engaged with the feed adjusting pin 9 via the connecting member, the super pattern is not arranged side by side. The operating range corresponding to 3 mm must be alternately swung, but the engagement of the shaft 19 and the feed adjusting pin 9 hinders the rocking). This also affects the forward / backward feed amount.
[0007]
  In the feed fine adjustment device disclosed in Japanese Utility Model Publication No. 59-8687, the effect of the fine adjustment of the left and right edge stitches also affects the feed of other patterns including the super pattern. In other words, the fine adjustment before and after the edge stitches of the buttonhole If the adjustment is made, the balance of the forward and backward feed of the super pattern will be lost. Therefore, the next time the super pattern is sewn, the fine adjustment of the forward and backward feed balance is inevitably required, and vice versa.
[0008]
  The feed adjustment mechanism disclosed in Japanese Patent Publication No. 58-31946 is an adjustment device that can maintain the corrected front-rear feed amount of the left and right edge stitches of the buttonhole that was last sewed. Even when buttonhole sewing is performed, if it has the same feed amount as before, it can be sewn immediately without performing trial sewing again, and the structure does not affect the feed amount of other patterns. In addition, it is considered that a super pattern correction device can be arranged side by side because of its structure.
[0009]
  From the viewpoint of operability and function, it can be said that it is the best. However, as shown in FIG. There are three laminated cams of the feed cam for the back stitching (cam with zero feed amount). Therefore, a transmission body that can transmit the cam lift of the laminated cam (movable in the cam laminating direction) is required. . The movable transmission body of the feed cam is not absolutely necessary for a currently known sewing machine, and therefore cannot be adopted for a sewing machine having a structure without a transmission body or a sewing machine with a structure that has a transmission body but does not move. There is.
[0010]
  Next, as a super pattern forward / backward feed amount correction adjustment device (balance adjustment), a feed control device disclosed in Japanese Patent Publication No. 56-50997 is known. However, this adjustment device is a device that emphasizes correction adjustment of super feed, and cannot be said to be perfect as a balance adjustment device for front / rear feed of the left and right edge stitches of a buttonhole. The reason for this is that the adjustment operation member is the same and the same operation (rotation operation) as the feed amount setting operation member for all patterns including the buttonhole. The amount balance adjustment (correction) cannot be performed. Therefore, in this apparatus, adjustment of the feed amount is emphasized, and correction adjustment cannot be performed. Instead, the structure of the feed cam is increased.
[0011]
  As described above, what can be said from the currently known feed correction devices is that it is technically difficult to align the correction devices for the super-pattern and the left and right edge stitches of the buttonhole. The device disclosed in Japanese Patent Publication No. 58-31946 However, there is a problem that the configuration condition is limited that the transmission body of the feed cam is necessary.
[0012]
  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sewing machine that can easily adjust a feed relating to a pattern including a reverse feed such as a buttonhole or a super pattern.
[0013]
[Means for Solving the Problems]
  In order to achieve this object, the sewing machine according to claim 1 comprises:The feed dog for feeding the cloth, the drive arm for reciprocating the feed dog, the swing arm for swinging the drive arm, and the swinging shaft fixed to the drive shaft of the sewing machine or the rotary shaft driven by the drive shaft. A cam for swinging the moving arm, a feed adjuster for adjusting the feed amount of the feed dog by varying the swing angle of the drive arm via the swing arm, and an inclination angle of the feed adjuster. For those equipped with a feed amount adjusting operation member to be adjusted and a pattern selection operation member operated to select a pattern, in particular, a forward feed cam for controlling the forward feed amount and a reverse feed amount A feed cam having a reverse feed cam for controlling the buttonhole and a buttonhole reverse auxiliary cam for controlling the reverse feed amount of the buttonhole edge sewing, and a pin capable of contacting the forward feed cam or the reverse feed cam. Control board, said front A control plate that is supported so as to be able to follow the forward feed cam or the reverse feed cam by contact between the feed cam or the reverse feed cam and the pin, and that controls the inclination angle of the feed adjuster; A feed auxiliary cam having a cam portion that rotates in conjunction with the operation of the pattern selection operation member, an auxiliary feed plate that is supported so as to be able to swing following the cam portion, and transmits the swing to the control plate; A buttonhole feed fine-adjustment body having an eccentric shaft portion rotatably supported by a sewing machine or a frame fixed to the sewing machine, and the buttonhole feedable to the eccentric shaft portion of the buttonhole feed fine-adjustment body in a rotatable manner When the reverse movement of the buttonhole edge sewing is selected by the pattern selection operation member, the swing is supported via the auxiliary feed plate. A buttonhole feed fine adjustment lever to be transmitted to the control plate, the buttonhole reverse feed stitching is selected by the operation of the pattern selection operation member, and the feed amount adjustment operation member is used for buttonhole edge stitching When the feed amount is adjusted, the reverse feed cam is configured to be separated from the pin provided on the control plate.
[0014]
  Claim 1InIn the described sewing machine,When the reverse feed of buttonhole edge sewing is selected by the pattern selection operation member, the buttonhole feed fine adjustment lever swings following the buttonhole reverse auxiliary cam, and the swing is moved to the auxiliary feed. The information is transmitted to the control plate via the plate. At this time, when the feed amount adjusting operation member is adjusted to the feed amount used for buttonhole edge sewing, the reverse feed cam is configured to be separated from the pin provided on the control plate. Therefore, the reverse feed cam does not affect the feed amount.
[0015]
  Claim 2InThe listed sewing machineThe reverse feed cam is configured such that an adjustable lower limit of the feed amount is set so that the feed amount used for the buttonhole edge stitching cannot be adjusted.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The word “buttonhole” is abbreviated as BH as appropriate.
[0017]
  1, FIG. 2, FIG. 3 and FIG. 4 are structural views of the embodiment.
[0018]
  As shown in FIG. 1, the feed dog 1 is supported so as to be swung by a drive arm 2, and the swing arm 4 transmits the power of a cam 3 fixed to the drive shaft to the drive arm 2. The swing arm 4 is configured to increase or decrease the amount of movement of the feed dog 1 in the front-rear direction depending on the inclination angle of the feed adjuster 5. FIG. 2 is a state diagram of the maximum feed amount position. The frame 10 is fixed to the sewing machine body (not shown).As shown in FIG.The frame 11 is fixed to the frame 10 with a nut 15 via a shaft 12 and a shaft 14 having one end fixed to the frame 11 and a threaded portion on the other end. The pattern selection shaft 16 is rotatably fitted to the frames 10 and 11 and is fixed to the frame 11 in the axial direction by a retaining ring 17.
[0019]
  The pattern selection operation member 18 is integrally fixed to one end of the pattern selection shaft 16. The gear 19 is fixed to the pattern selection shaft 16 with a pin 20 and can rotate integrally with the pattern selection operation member 18. The auxiliary cam 21 has a gear portion that meshes with the gear 19 on the outer periphery thereof, a groove cam portion is formed on the side surface, and is rotatably supported by a shaft 22 fixed to the frame 10. The auxiliary feed plate A24 and the auxiliary feed plate B25 are stepped screws 26 fixed to the frame 10.(See sectional view BB in FIG. 4)The pulling spring 28 attracts each other in one direction and is rotated integrally by the respective stoppers.
[0020]
  As shown in the sectional view BB in FIG. 2 and FIG.The shaft portion 24-a of the auxiliary feed plate A24 is inserted into the groove cam portion of the auxiliary cam 21, and the cam lift is transmitted. The BH feed fine adjustment operating member 29 (see FIG. 4) has a gear portion on the outer periphery thereof, is rotatably fitted in a hole portion of the frame 10, and is fixed in the axial direction by a retaining ring 30. A BH feed fine adjustment body 31 having a gear portion meshing with a gear portion of the BH feed fine adjustment operation member 29 on the outer periphery and having an eccentric shaft portion is rotatably supported by a shaft 32 fixed to the frame 10. The BH feed fine adjustment lever 34 is rotatably fitted to the eccentric shaft portion of the BH feed fine adjustment body 31 and is fixed in the axial direction by a retaining ring 35. The shaft portion 34-a of the BH feed fine adjustment lever 34 is fitted into the hole portion 25-a of the auxiliary feed plate B25.(See Figure 2).
[0021]
  The support frame 36 is fixed to the sewing machine main body, and the support shaft 36-a is fixed to the support frame 36. The feed cam 39 having the BH reverse drive cam 39-a on the outer periphery and having the forward feed cam 37 and the reverse feed cam 38 is rotatably supported by the support shaft 36-a. The feed amount adjusting operation member 40 is rotatably supported by the support shaft 36-a, and the feed amount adjusting operation member 40 and the feed cam 39 are integrally formed by fitting the groove portion 40-a and the projection 39-b of the feed cam 39. Can be rotated(See Figure 3). The control plate 41 has a U-shaped portion at the upper end inserted into the groove of the support shaft 36-a, and a lower end at the hole portion 42-a of the reverse stitching lever 42 having a hole portion 42-a portion and a rotation fulcrum fixed to the sewing machine body. And is supported so as to be able to reciprocate in the vertical direction.
[0022]
  Further, the control plate 41 can transmit the cam lift of the forward feed cam 37 or the reverse feed cam 38 of the feed cam 39 via a pin 41-d fixed to the control plate 41, and is always driven by the biasing force of the tension spring 43. It is pressed toward the forward feed cam 37 via the pin 41-d, and its vertical position is kept constant. Further, the control plate 41 has a hole portion 41-c, and the hole portion 41-c is fitted with the pin portion 25-b of the auxiliary feed plate B25, and the cam lift of the cam portion of the auxiliary cam 21 is provided. Can be transmitted to the control board 41. The feed adjuster 5 is in contact with the shaft 45 fixed to the control plate 41 by the urging force of the pulling spring 44, and presses the control plate 41 upward via the shaft 45 (pin 41-d is being applied to the forward feed cam).
[0023]
  The BH reverse assist cam 39-a and the shaft portion 34-b of the BH feed fine adjustment lever 34 are always separated from each other. However, the BH reverse assist cam 39-a is in contact with the operation of the auxiliary feed plate A24 at the time of reverse edge sewing of the buttonhole. The part 34-b can transmit the cam lift of the BH reverse assist cam 39-a (details of the operation will be described later).
[0024]
  As shown in FIG. 2, when the feed amount adjusting operation member 40 is rotated to set a specific feed amount position, the forward feed cam 37 is interlocked and rotated as shown in FIG. The plate 41 follows the cam surface of the forward feed cam 37 via the pin 41-d by the biasing force of the tension spring 43, and stops at the vertical position corresponding to the feed amount display of the feed amount adjusting operation member 40. The container 5 also follows the shaft 45 by the urging force of the tension spring 44 and generates a predetermined feed amount.
[0025]
  In reverse feed stitching (reverse feed), the control plate 41 is lowered and the pin 41-d transmits the cam lift of the reverse feed cam 38 by depressing the reverse stitching lever 42 by manual operation against the urging force of the tension springs 43 and 44. Then, when the inclination state of the feed adjuster 5 follows this, a reverse feed amount (the same amount as the forward feed amount set by the feed amount adjusting operation member 40) is generated. However, when the feed amount adjusting operation member 40 is set to a feed amount equal to or less than a predetermined amount, a constant reverse feed occurs instead of the reverse feed amount corresponding thereto. The reason is as shown in the cam lift diagram of the forward and reverse feed cams in FIG. 8. The cam lift of the reverse feed cam is intentionally cut at a certain lift position (not to be smaller than a constant reverse feed amount). (The details of the purpose of cutting will be described later). The above is the operation and operation for adjusting the feed amount of patterns other than the buttonhole and super pattern.
[0026]
  Next, the operation and operation for adjusting the feed amount of the buttonhole will be described in detail.
[0027]
  First, when performing forward feed edge stitching (for the sake of convenience, right edge stitching), the feed amount adjusting operation member 40 is set to the intended edge stitch feed amount (about 0.2 to 1 mm), and pattern selection operation is performed. When the member 18 is rotated to set it at the right edge sewing position of the buttonhole, the gear 19 rotates integrally, and the auxiliary cam 21 having a gear portion meshing with the gear 19 on its outer periphery also rotates in conjunction with the gear 19. The state shown in FIG. The auxiliary feed plate A24 and the auxiliary feed plate B25 that are integrally rotatable follow a certain direction by the biasing force of the tension spring 43 through the pin portion 25-b and the hole portion 41-c of the control plate 41. Trying to rotate.
[0028]
  At this time, the shaft portion 24-a of the auxiliary feed plate A24 does not contact the cam surface 21-a (see FIG. 5) of the groove cam portion of the inserted auxiliary cam 21. Even if the control plate 41 rotates the auxiliary feed plate A24 and the auxiliary feed plate B25 to the maximum operating position (the pin 41-d transmits the maximum cam lift of the forward feed cam 37), the shaft portion 24 of the auxiliary feed plate A is rotated. This is because the groove cam lift of the auxiliary cam 21 is set so that -a does not contact the cam surface (see FIG. 2). Therefore, the control plate 41 is not affected by the cam lift of the auxiliary cam 21, and is controlled by the cam lift of the forward feed cam 37 transmitted by the pin 41-d (the intended edge stitching feed amount set by the feed amount adjusting operation member 40). The position is determined, and the feed adjuster 5 follows this to generate a predetermined forward feed amount. Note that the shaft portion 34-b of the BH feed fine adjustment lever 34 is lifted by the control plate 41 by the urging force of the pulling spring 43 to keep its position, and the hole portion 25-a and the shaft portion of the auxiliary feed plate B 25. The position away from the BH reverse assist cam 39-a is maintained via 34-a so that no influence is exerted on the edge stitch forward feed.
[0029]
  When performing reverse feed edge stitching (for the sake of convenience, left edge stitching), leave the feed amount adjusting operation member 40 set to the intended edge stitch feed amount (set at the time of forward edge stitching) When the pattern selection operation member 18 is rotated to set it at the sewing position of the left edge of the buttonhole, the gear 19 rotates integrally, and the auxiliary cam 21 having a gear portion that meshes with the gear 19 on the outer periphery also rotates. Thus, the state shown in FIG. 6 is obtained. At this time, from the point in time when the auxiliary cam 21 rotates and the shaft portion 24-a comes into contact with the inclined surface portion of the groove cam of the auxiliary cam 21 (refer to FIG. 7 and the enlarged view), the cam lift is auxiliary fed via the shaft portion 24-a. Although the plates A24 and B25 are to be rotated, the direction of the tension spring 43 is to rotate the auxiliary feed plates A24 and B25 (via the pin portion 25-b and the hole portion 41-c). The direction is the opposite of the direction to do.
[0030]
  Since the urging force of the tension spring 28 that integrally fixes the auxiliary feed plates A24 and B25 in the rotational direction is set to be stronger than the urging force of the tension spring 43, the extension spring 43 extends to extend the auxiliary feed plate. A24 and B25 rotate according to the cam lift of the auxiliary cam 21 and push down the control plate 41 via the pin portion 25-b and the hole portion 41-c (FIG. 6: At this time, the cam surface of the forward feed cam 37 and the pin 41- d leaves). At the same time, the auxiliary feed plate B25 rotates the BH feed fine adjustment lever 34 through the hole portion 25-a and the shaft portion 34-a to press the shaft portion 34-b against the cam surface of the BH reverse assist cam 39-a. The vertical position of the control plate 41 is determined by the cam lift of the BH reverse assist cam 39-a transmitted by the shaft portion 34-b, and the feed adjuster 5 follows this to generate a predetermined reverse feed amount.
[0031]
  The cam lift of the auxiliary cam 21 has a large cam lift so as to surely press the shaft portion 34-b against the cam surface of the BH reverse auxiliary cam 39-a, so that the shaft portion 34-b becomes the BH reverse auxiliary cam 39. The shaft portion 24-a further moves by the cam surface after coming into contact with -a, but the tension spring 28 is extended, and a gap (shown in FIG. 6) is generated between the stoppers of the auxiliary feed plates A24 and B25. It is designed not to cause damage or deformation.
[0032]
  Here, the cutting of the cam lift of the reverse feed cam 38 will be described. FIG. 8 shows cam lifts of the forward / reverse feed cams 37 and 38 and the BH reverse drive cam 39-a. Assuming that the minute region cam lift used in BH front and rear edge stitch feed is in the range AB, the forward feed cam 37 is formed with the cam lift in the range AB, but is not present in the reverse lift cam 38 cam lift. In this way, it is intentionally cut. Instead, a cut cam lift is formed on the BH reverse assist cam 39-a.
[0033]
  In the above description of the operation, the feed amount for the forward feed at the edge sewing is determined by the cam lift of the forward feed cam 37, and the feed amount for the reverse feed at the edge sewing is the feed amount (the same as that corresponding to the forward feed) of the BH reverse auxiliary cam 39-a. Basically, a seam in which the feed amount of the front and rear edge stitches is balanced is formed.
[0034]
  However, this is not the case when the stretchable cloth is sewed as described above, and it is considered that the balance deviation occurs when the forward feed after the edge sewing is larger than the forward feed and when the forward feed is larger than the forward feed. At this time, if it is attempted to correct the balance of the reverse feed with respect to the edge stitch forward feed, there is no problem in performing the balance correction to reduce the reverse feed. However, if the balance correction to be increased is to be corrected, the reverse feed cam 38 If a small region of the cam lift A-B exists, a problem occurs.
[0035]
  Even if an attempt is made to perform a balance correction for increasing the reverse feed beyond the AB cam lift of the reverse feed cam 38, if the reverse feed cam 38 has a cam surface in the range AB, the cam surface obstructs it. It is because it ends. Therefore, in order to finely adjust the balance correction, it is necessary to cut (remove) the cam lift between A and B from the cam lift of the reverse feed cam. Instead, this is compensated by the BH reverse auxiliary cam 39-a. Become. The above is the reason for cutting the reverse feed cam lift.
[0036]
  Subsequently, the operation for adjusting the balance of the forward feed amount of the edge stitch with respect to the forward feed amount of the edge stitch will be described in detail (FIG. 9). When it is desired to change the reverse feed amount relative to the edge stitch forward feed amount, if the BH feed fine adjustment operating member 29 is rotated to the left (or right) by an appropriate amount, the BH feed fine adjustment body 31 having a gear meshing with the gear portion ( The eccentric shaft part) rotates. The position of the BH fine adjustment lever 34 is slightly changed due to the displacement of the center of the eccentric shaft that is the center of rotation. Describing approximately, the BH fine adjustment lever 34 rotates with the shaft portion 34-b pressed against the cam surface of the BH reverse assist cam 39-a as a fulcrum (the amount of displacement of the eccentric shaft portion), and the shaft portion 34 is rotated. The auxiliary feed plates A24 and B25 are rotated through -a and the hole 25-a, and the control plate 41 and the feed adjuster 5 are lifted (or pushed down) by a small amount to make a correction fine adjustment (balance) with the forward feed amount. Adjustment). D is the maximum adjustment amount that can adjust the reverse feed small, and E is the maximum adjustment amount that can be adjusted large.
[0037]
  Finally, when performing clasp stitching, the feed amount adjusting operation member 40 is set to the intended edge stitch feed amount (set at the time of forward edge sewing), and the pattern selection operation member 18 is moved to the buttonhole. When the gear 19 is rotated to set it to the position where it is sewn, the auxiliary cam 21 having a gear portion meshing with the gear 19 on its outer periphery also rotates in conjunction with the state shown in FIG. Become. At this time, as in the case of reverse feed edge sewing, when the auxiliary cam 21 rotates and the shaft portion 24-a comes into contact with the inclined surface portion of the groove cam of the auxiliary cam 21, the cam lift passes through the shaft portion 24-a. The auxiliary feed plates A24 and B25 are rotated by the pulling spring 43 by the biasing force (via the pin portion 25-b and the hole portion 41-c) to rotate the auxiliary feed plates A24 and B25. The direction is opposite to the direction to be attempted.
[0038]
  The urging force of the tension spring 28 that integrally fixes the auxiliary feed plates A24 and B25 in the rotational direction is set to be stronger than the urging force of the tension spring 43. The plates A24 and B25 rotate according to the cam lift of the auxiliary cam 21, and push down the control plate 41 through the pin portion 25-b and the hole portion 41-c (at this time, the cam surface of the forward feed cam 37 and the pin 41-d are Leave).
[0039]
  At the same time, the auxiliary feed plate B25 rotates the BH feed fine adjustment lever 34 through the hole portion 25-a and the shaft portion 34-a to bring the shaft portion 34-b closer to the cam surface of the BH reverse assist cam 39-a. However, the cam surface of the shaft portion 34-b and the BH reverse assist cam 39-a are not in contact with each other. The counter feed stitch feed amount (0) advancesSendingThe cam lift of the auxiliary cam 21 and the cam lift of the BH reverse auxiliary cam 39-a are not determined, but are determined by the camft of the auxiliary cam 21. This is because the feed amount of the edge stitch intended by the feed amount adjusting operation member 40 is not 0 (in the present invention, it is not necessary to set the feed amount adjusting operation member 40 to the 0 position of the feed amount at the time of clasp sewing). Inevitably, the above-mentioned state is obtained (however, this is not the case when the feed amount adjusting operation member 40 is set to the feed 0 position, and the shaft portion 34-b and the BH reverse assist cam 39-a are in contact). In other words, the back and forth feed is one pattern such as BH or super pattern.Mixed inExisting patternInGood feed adjustment can be achieved. In particular, the need for BH right and left edge sewing is high.
[0040]
  As described above, according to the present invention, as described above, it is possible to adjust the feed amount of the left and right edge stitches without requiring a transmission body to which the cam lift of the movable feed cam is transmitted, and to perform fine adjustment of the balance of the front and rear feed. Is possible.
[0041]
[0042]
[0043]
  Further, since it is one of the problems to be solved by the present invention that it is possible to align with a super-pattern front / rear feed correction fine adjustment (balance adjustment of front / rear feed), it is a problem to be solved by the present invention. A brief description and illustration of an embodiment of a possible super-pattern correction fine-tuning device is attached.
[0044]
As shown in FIG. 11 and FIG.The super pattern feed cam 101 is rotatably supported by a shaft 102 fixedly supported by the frame 10 and the frame 11, and is always rotated by a drive shaft. The SS transmission body 103 is rotatably supported by the frame 11. The SS switching holder 104 is rotatably supported by a shaft 105 fixed to the support frame 36, and the shaft portion 104-a of the SS switching holder 104 is fitted into the groove cam portion of the feed amount adjusting operation member 40. The SS lever 106 is rotatably supported by a shaft 107 that is fixedly supported by the SS switching holder 104 and is connected to the SS transmission body 103 by an SS link 108. One end of the control lever 109 is connected to the SS lever 106 and the other end is connected to the shaft portion 110 fixed to the feed adjuster 5.
[0045]
  One end of the tension spring 111 is supported by the sewing machine body or the fixed portion, the other end is hooked on the SS transmission body 103, and the transmission section 103-a of the SS transmission body 103 is always attached in a direction away from the cam surface of the super pattern cam 103. It is supported. FIG. 11 is a super pattern feeding operation state diagram. In this configuration, switching between a super pattern and another pattern is switched at the rotational position of the feed amount adjusting operation member 40, and the feed amount adjusting operation member 40 is further rotated from the maximum feed amount position (super pattern position). Is set to Since the biasing force of the tension spring 111 is set to be extremely smaller than that of the tension spring 44, the cam lift of the super pattern feed cam 101 is transmitted to the feed adjuster 5 by the biasing force of the tension spring 44, and the super pattern feed is performed. appear.
[0046]
  FIG. 13 is a diagram illustrating a state in which the super pattern feeding is paused.
[0047]
  When the feed amount adjusting operation member 40 is rotated from the feed amount 0 to the maximum feed amount range (outside the super pattern range) (FIG. 13 shows the position of the feed amount 0 when the feed amount adjusting operation member 40 is fully rotated). According to the cam lift of the groove cam of the feed amount adjusting operation member 40, the SS switching holder 104 rotates around the shaft 105, and the position of the shaft 107 changes (the shaft 107 is lifted). Along with this, the SS lever 106 is also lifted, and the force first rotates the SS transmission body 103 in a direction away from the cam 101 via the SS link 108 (the biasing force of the pulling spring 111 promotes this operation). However, when the outer shape of the SS transmission body 103 and the stopper 10-a provided on the frame 10 come into contact with each other, the SS lever 106 rotates so as to lift the control lever 109, and the operation ends. At this end, the groove 109-a of the control lever 109 and the shaft 110 of the feed adjuster 5 are in a position where they do not interfere with each other in the maximum forward / backward feed range.
[0048]
  The fine adjustment of the balance of the super pattern front / rear feed is performed by changing the position of the shaft 107 which is the rotation center of the SS lever 106 by a minute amount. Although not described in detail, the position A in FIG. 14 is an appropriate switching position in the super pattern of the shaft portion 104-a of the SS switching holder. The B and C positions are ranges set as fine adjustment ranges in the feed amount adjusting operation member 40. FIG. 15 is a diagram showing the fine adjustment operation.
[0049]
【The invention's effect】
  As is apparent from the above description, the sewing machine according to claims 1 and 2 has a simple structure, such as a super pattern and a buttonhole, in particular that does not require movement of the buttonhole feed laminating cam and the feed cam lift transmission body. The front / rear feed is one patternInMixed patternInIt is possible to achieve good feed adjustment.
[Brief description of the drawings]
FIG. 1 is a mechanism configuration diagram of an apparatus related to a feed dog of a sewing machine according to an embodiment.
FIG. 2 is a mechanism configuration diagram relating to a feed setting when the sewing machine of the embodiment is at a maximum feed.
FIG. 3 is a cross-sectional top view relating to an operation member of the sewing machine according to the embodiment.
FIG. 4 is a configuration diagram of a mechanism related to the sewing machine feed adjuster according to the embodiment;
FIG. 5 is a mechanism configuration diagram relating to feed setting when the sewing machine according to the embodiment is in a forward feed edge sewing state;
FIG. 6 is a mechanism configuration diagram relating to feed setting when the sewing machine of the embodiment is in a reverse feed edge sewing state;
FIG. 7 is a mechanism configuration diagram related to feed setting when the sewing machine according to the embodiment is in an intermediate state between forward feed edge sewing and reverse feed edge sewing.
FIG. 8 is a diagram illustrating a cam lift of the sewing machine according to the embodiment.
FIG. 9 is an operation explanatory diagram of balance adjustment of the forward / backward feed amount in the sewing machine according to the embodiment.
FIG. 10 is a mechanism configuration diagram related to feed setting when the sewing machine according to the embodiment is in a state of being sewn with stitches.
FIG. 11 is a mechanism configuration diagram of an apparatus related to a feed dog of a sewing machine according to another embodiment.
FIG. 12 is a cross-sectional top view relating to an operation member of a sewing machine according to another embodiment.
FIG. 13 is a diagram showing a state in which the sewing machine of another embodiment has a feed amount of 0 and super pattern feed is paused.
FIG. 14 is an operation explanatory view of a feed amount adjusting member in a sewing machine according to another embodiment.
FIG. 15 is an operation explanatory diagram related to fine adjustment in a sewing machine according to another embodiment;
FIG. 16 is a structural diagram of a conventional sewing machine feed adjusting device.
[Explanation of symbols]
1 Feed dog
2 Driving arm
3 Drive cam
4 Swing arm
5 Feed adjuster
6 Feeding cam
10 frames
11 frames
12 axes
14 axes
15 axes
16 Pattern selection axis
17 Retaining ring
18 Pattern selection operation members
19 Gear
20 pins
21 Auxiliary cam
22 axes
24 Auxiliary feed plate A
25 Auxiliary feed plate B
26 Step screw
28 Spring
29 BH feed fine adjustment operation member
30 retaining ring
31 BH feed fine adjustment body
32 axes
34 BH feed fine adjustment lever
35 retaining ring
36 Support frame
37 Forward feed cam
38 Reverse feed cam
39 Feeding cam
40 Feed adjustment operation member
41 Control board
42 Reverse stitching lever
43 Pulling spring
44 Pulling spring
45 pin
101 Super pattern feed cam
102 axes
103 SS carrier
104 SS switching holder
105 axes
106 SS lever
107 axes
108 SS
109 Control lever
110 axes
111 tension spring

Claims

A feed dog (1) for feeding the cloth, a drive arm (2) for reciprocating the feed dog (1), a swing arm (4) for swinging the drive arm (2), and driving the sewing machine A cam (3) for swinging the swing arm (4) fixed to a rotating shaft driven by a shaft or a drive shaft, and a swing angle of the drive arm (2) via the swing arm (4) The feed adjuster (5) for adjusting the feed amount of the feed dog (1) by changing the feed rate, the feed amount adjusting operation member (40) for adjusting the inclination angle of the feed adjuster (5), and the pattern In a sewing machine comprising a pattern selection operation member (18) operated to select,
A forward feed cam (37) for controlling the forward feed amount, a reverse feed cam (38) for controlling the reverse feed amount, and a buttonhole reverse assist for controlling the reverse feed amount of buttonhole edge sewing A feed cam (39) having a cam (39-a);
A control plate (41) provided with a pin (41-d) capable of contacting the forward feed cam (37) or the reverse feed cam (38), the forward feed cam (37) or the reverse feed cam (38) and the pin (41-d) are movably supported by following the forward feed cam (37) or the reverse feed cam (38) by contact with the pin (41-d), and by the movement, the feed adjuster (5) A control plate (41) for controlling the inclination angle of
A feed auxiliary cam (21) having a cam portion (21-a) that rotates in conjunction with the operation of the pattern selection operation member (18);
Auxiliary feed plates (24), (25) supported so as to be able to swing following the cam portion (21-a) and transmitting the swing to the control plate (41),
A buttonhole feed fine-adjustment body (31) having an eccentric shaft rotatably supported by a sewing machine or a frame fixed to the sewing machine;
The pattern selection operating member (31) is rotatably fitted to the eccentric shaft portion of the buttonhole feed fine adjustment body (31) and is swingably supported following the buttonhole reverse auxiliary cam (39-a). 18) The buttonhole feed fine adjustment lever for transmitting the swing to the control plate (41) via the auxiliary feed plates (24) and (25) when the reverse feed of the buttonhole edge sewing is selected in 18). (34)
When the buttonhole reverse feed stitching is selected by the operation of the pattern selecting operation member (18), and the feed amount adjusting operation member (40) is adjusted to the feed amount used for buttonhole edge stitching. The reverse feed cam (38) is configured to be separated from the pin (41-d) provided on the control plate (41) .

The reverse feed cam (38) is configured such that an adjustable lower limit of the feed amount is set so that the feed amount used for buttonhole edge sewing cannot be adjusted. The sewing machine according to 1.