JP3647490B2

JP3647490B2 - Sewing machine differential feed adjuster

Info

Publication number: JP3647490B2
Application number: JP33741994A
Authority: JP
Inventors: 美和江端
Original assignee: Janome Sewing Machine Co Ltd
Current assignee: Janome Sewing Machine Co Ltd
Priority date: 1994-12-28
Filing date: 1994-12-28
Publication date: 2005-05-11
Anticipated expiration: 2020-05-11
Also published as: JPH08182877A

Description

【０００１】
【産業上の利用分野】
本発明は、小型ロックミシンの差動送り装置において、差動比を変えても総合的な送り量が変わらないようにしたミシンの差動送り調節装置に関する。
【０００２】
【従来の技術】
従来のミシンにおいて、差動送り機能を有する送り機構は、送り要素が主送り要素と副送り要素とに分離され、それぞれの送り要素が送り歯、即ち、主送り歯・副送り歯を有し、かつ該２つの送り要素におけるそれぞれの送り量を制御する送り調節機構を各送り要素が所有し、更に該２つの送り調節機構を連結関連ずけるための連結機構を有し、該連結機構を介すことにより送り量を調節したときには主・副両送り機構が制御され、差動量を調節したときには副送り機構のみが制御される。このことにより差動送り機能を有する送りが発生・制御されるものである。
【０００３】
【発明が解決しようとする課題】
しかるに、上記差動送り機能を有する送り発生メカニズムにおいては、ある一定送り量に対して差動比を変えた場合、主送り量は変化することなく副送り量のみ変化することとなる。その結果、総合的な送り量は送り量の変化を意図していないにもかかわらず変化してしまうことになる。即ち、『差動比を変えると送り量が変わる』こととなる。これを解決することが望まれている。
【０００４】
【課題を解決するための手段】
そこで発明者は、前記課題を解決すべく、鋭意，研究を重ねた結果、その発明を、主送りカム，主送り水平リンクを介して主送り台の運動を発生するための機構と、副送りカム，副送り水平リンクを介して副送り台の運動を発生するための機構と、前記主送り台の送り量を変化させるための送り調節機構と、前記主送り台の送り量に対する副送り台の送り量を変化させる差動送りの差動量を変化させるための差動調節機構とを有し、前記送り調節機構は送り量調節操作部にて、前記差動調節機構は差動調節操作部にてそれぞれ調節可能とし、前記送り量調節操作部の操作にて揺動可能な送り腕の揺動角度を制御し、前記差動調節操作部の操作にて昇降する差動ロッドにより、前記送り腕に連動する差動変換腕の揺動角度を制御することで、前記主送り歯と副送り歯とを協動するようにして差動比を変えても、総合的な送り量が変わらないようにしてなることを特徴とするミシンの差動送り調節装置としたことにより、前記課題を解決した。また、主送りカム，主送り水平リンクを介して主送り台の運動を発生するための機構と、副送りカム，副送り水平リンクを介して副送り台の運動を発生するための機構と、前記主送り台に設けた主送り歯の送り量を変化させるための送り調節機構と、前記副送り台に設けた副送り歯の送り量を変化させる，差動送りの差動量を変化させるための差動調節機構とを有し、前記送り調節機構は送り量調節操作部にて、前記差動調節機構は差動調節操作部にてそれぞれ調節可能とし、前記送り量調節操作部の操作にて揺動可能な送り腕の揺動角度を制御可能とし、前記差動調節操作部の操作にて昇降する差動ロッドに設けたピンの位置にて、前記送り腕に連動する差動変換腕の揺動角度を制御可能とし、前記主送り歯と副送り歯とを協動するようにして差動比を変えても、総合的な送り量が変わらないようにしてなることを特徴とするミシンの差動送り調節装置としたことにより、前記課題を解決したものである。
【０００５】
【作用】
本発明は、送り調節機構及び差動調節機構を設け、且つその関連リンク機構を設けて、差動比を変える操作をしたとき、差動機構と、この補正機構を備えることで、総合的な送りの表示を変えることなく、自動的に送り調節機構を変化させ、所定の送り量における所定の差動比が得られるようにできる。
【０００６】
【実施例】
以下、本発明の一実施例を図面に基づいて説明する。その図１は本発明のミシン（ロックミシン）全体構成を示すものであり、ミシン機枠Ａはアーム機枠１とベッド機枠２からなり、該ベッド機枠２にはモータ（図示せず）により駆動される駆動軸３（図７参照）が支持され、該駆動軸３の機枠外端にプーリ４が固着されている。前記アーム機枠１には針棒５が上下動可能に支持され前記駆動軸３により伝達軸を介して運動可能に設けられている。
【０００７】
前記アーム機枠１の全面には複数の糸調子器６，６…が配設され、該糸調子器６，６，…はアーム機枠１の後方に配設した糸立台７に装着される糸駒からの糸に張力を調節可能に付与している。アーム機枠１の全面下方にはループカバー８が開閉自在に枢着されている。
【０００８】
前記ベッド機枠２には上面に針板９が水平状に設けられ、該針板９の周辺は回動し得るベッドカバー１０にて包囲するように設けられている。前記針板９には前後方向に長く穿設される送り歯窓１１が設けられ、該送り歯窓１１には主送り歯１２と副送り歯１３とが備えられている。
【０００９】
次に、差動送り機構について詳細に説明する。該差動送り機構は、ボックスＦの内部に収納されており、具体的には、図７に示すように、前記駆動軸３には主送りカム１４及び副送りカム１５が夫々の対向する端面１４ａ，１５ａを適宜間隔を置いてネジ止めされている。主送りカム１４には主送り水平リンク１６の一端１６ａが、副送りカム１５には副送り水平リンク１７の一端１７ａがそれぞれ回動可能に設けられている。
【００１０】
前記主送り歯１２を前端部に固着した主送り台１８は後端部１８ａを主送り揺動腕１９の上端部１９ａにピン２０を介して軸着され、略中央の垂直部に窓部１８ｂが設けられ、該窓部１８ｂには角駒２１が前後方向にのみ摺動可能に設けられている。前記主送り揺動腕１９は副送り揺動腕２２と共に前記ベッド機枠２に固着された揺動腕台２３の両側に立設した支持板２４、２４に水平上に設けられた軸部２５に揺動自在に支持されている。
【００１１】
前記副送り揺動腕２２の上端２２ａには副送り台リンク２６の一端２６ａがピン２７を介して連結されている。前記副送り歯１３を前端部に固着した副送り台２８は後端部２８ａを前記副送り台リンク２６の他端２６ｂにピン２９を介して連結されている。前記主送り台１８の窓部１８ｂ内には幅広で窓部１８ｂより突出部を有する角駒２１が前後方向に摺動を可能に嵌装されている。
【００１２】
前記副送り台２８は主送り台１８の上面に固着された押え板３０の下面と窓部１８ｂより突出の前記角駒２１の上面２１ａとの間にて前後方向の摺動が可能に狭持されている。前記角駒２１は中央に穴部２１ｂが形成され、該穴部２１ｂを前記副送りカム１５に一体的に設けられた上下送りカム１５ｂに嵌装されている。角駒２１の両側面には前記駆動軸３上に嵌挿の座金３１，３１が配設され、該座金３１の両側の突起部３１ａ，３１ａを角駒２１に穿設の凹部２１ｃ，２１ｃに嵌合して回転止されたものが、前記主送りカム１４の端面１４ａと副送りカム１５の端面１５ａとの間に装着されている。
【００１３】
前記主送りカム１４の外周に一端１６ａを嵌装の主送り水平リンク１６の他端１６ｂには主送りリンク３２の一端３２ａがピン３３を介して連結されており、主送りリンク３２の他端３２ｂは前記主送り揺動腕１９の下端部１９ｂとピン３４にて連結されている。前記ピン３３上には主送り調節リンク３５の一端３５ａが回動可能に支持されている。
【００１４】
また、前記副送りカム１５に、一端１７ａを嵌装された副送り水平リンク１７において、その他端１７ｂには副送りリンク３６の一端３６ａがピン３７を介して連結されており、副送りリンク３６の他端３６ｂは前記副送り揺動腕２２の下端部２２ｂとピン３８にて連結されている。前記ピン３７上には副送り調節リンク３９の一端３９ａが回動可能に支持されている。
【００１５】
次に、差動送り調節装置について図６及び図７を参照して述べる。Ｐは前記主送り調節リンク３５の他端３５ｂと主送り伝達腕４０の先端部４０ａとの連結軸線を示し、主送り調節リンク３５の他端３５ｂと主送り伝達腕４０の先端部４０ａとは回動可能に設けられている。Ｑは前記副送り調節リンク３９の他端３９ｂと副送り調節腕４１の先端部４１ａとの連結軸線を示し、前記副送り調節リンク３９の他端３９ｂと副送り調節腕４１の先端部４１ａとは回動可能に設けられている。以上のように、ボックスＦの部材と、これ以外の側の主送り伝達腕４０又は副送り調節腕４１とが連結されている。
【００１６】
前記主送り伝達腕４０は基端がミシン機枠Ａに回転自在に支持された軸部４２の一端に固着されており、該軸部４２の他端には送り腕４３が固着されている。該送り腕４３は一端４３ａに送り量調節操作部６０に送りロッド４４が連結されており、前記送り腕４３の他端４３ｂに差動送り調節装置に連結される連結ロッド４５の一端４５ａが回動可能に連結されている。その連結ロッド４５の他端４５ｂは、差動送り調節装置の差動変換腕４９の下端４９ｂに回動自在に設けられている。
【００１７】
差動送り調節装置の差動調節操作部６１により作動される差動ロッド４６の下端にはピン４７が植設され、該ピン４７は、ミシン機枠Ａに固定された固定板４８のガイド長孔４８ａに遊挿され、図２乃至図６において上下方向のみ昇降自在に設けられている。その差動変換腕４９の中間に設けた長孔４９ａが前記ピン４７に遊挿されている。このような構成により、送り量調節操作部６０を回転調節し、その主送り量の比較的早いものとして選択すると、図４（Ａ），（Ｂ）において、図２よりも、送りロッド４４が下がり、その送り腕４３が図４（Ａ），（Ｂ）において時計方向に回動させる。次いで、差動調節操作部６１を回転調節し、その副送り量の遅いものから早いものを適宜選択する。副送り量が少ない場合には、差動ロッド４６が僅かに下がり〔図４（Ａ）参照〕、差動変換腕４９を図４（Ａ）において時計方向により僅かな回転を与えることとなり、揺動角度θ₃を小さくできる。副送り量を早くする場合には、図４（Ｂ）において、差動ロッド４６が下がり、差動変換腕４９を図４（Ｂ）において時計方向により回転を与えることとなり、揺動角度θ₄を大きくできる。このように大きくなるのに、差動調節操作部６１を回転調節して比例的ではあるが、急激に揺動角度θが大きくなり、実験的に調べた総合的な送り量を、前記主送り量と同一にできる。
【００１８】
また、主送り量の比較的遅いものとして選択すると、図２及び図３において、図２よりも、送りロッド４４が上昇した位置となっており、その送り腕４３が図２の状態となっている。次いで、差動調節操作部６１を回転調節し、その副送り量の遅いものから早いものを適宜選択する。副送り量が中間の場合には、差動ロッド４６が長孔４９ａの中間位置まで下がり（図２参照）、差動変換腕４９を図２において反時計方向により僅かな回転を与えることとなり、揺動角度θ₁を小さくできる。副送り量を早くする場合には、図３において、差動ロッド４６が下がり、差動変換腕４９を図３において反時計方向により回転を与えることとなり、揺動角度θ₂を大きくできる。このように反時計方向に揺動角度θが大きくなるのは、差動調節操作部６１を回転調節して反比例的ではあるが、急激にマイナス方向に揺動角度θが大きくなり、実験的に調べた総合的な送り量を、前記主送り量と同一にできる。
【００１９】
以上のように、特に、主送り量が大きい場合には、差動調節して、大きな副送り量を出した場合には、その所定の副送り量よりも大きな値とし、滑り等を考慮して全体の送り量が、設定した主送り量と同等となるようにできる。また、主送り量が少ない場合には、差動調節して、少ない副送り量を出した場合には、その所定の副送り量よりも小さな値とし、この場合も滑り等を考慮して全体の送り量が、設定した主送り量と同等となるようにできる。
【００２０】
また、前記差動変換腕４９の上端４９ｃに設けたピン５０が、副送り伝達腕５１の他端５１ａに軸支されている。その下端（基部）５１ｂは、ミシン機枠Ａに回転自在に支持される軸杆５２の一端に固着され、該軸杆５２の他端には副送り連結腕５３の基部が固着されている。該副送り連結腕５３の先端部５３ａには前記副送り調節腕４１の他端４１ｂと副送り連結ロッド５４を介して回動可能に連結されている。
【００２１】
差動送り調節装置の細部について図２及び図３を参照して以下に述べる。ミシン機枠Ａに固定された調節台６２には送りカム軸６３が支持され、該送りカム軸６３には前記送り量調節操作部６０の回動に連動する送りカム６４が設けられており、該送りカム６４には外周にローレット等の如き刻まれた細溝が形成された円板６５が一体的に設けられており、該円板６５の外周に対し前記調節台６２に設けられた板ばね６６の一端が押圧せしめられ、送りカム６４の回転が抵抗あるように規制されている。
【００２２】
前記調節台６２には軸部６７に支持されて、一端に調節可能に固着され先端を前記送りカム６４の外周に当接する従動子６８を備えて揺動可能に支持された送り調節腕６９が設けられており、該送り調節腕６９の他端６９ａは前記送りロッド４４に回動可能に連結されると共に前記従動子６８を送りカム６４に押圧するばね７０が装着されている。
【００２３】
また、前記調節台６２には差動カム軸７１が支持され、該差動カム軸７１には前記差動調節操作部６１の回動に連動する差動カム７２が設けられており、該差動カム７２には外周にローレット等の如き刻まれた細溝が形成された円板７３が一体的に設けられており、該円板７３の外周に対し前記調節台６２に設けられた板ばね７４の一端が押圧せしめられ、差動カム７２の回転が抵抗あるように規制されている。
【００２４】
さらに、前記調節台６２には軸部７５に支持されて、一端に調節可能に固着され先端を前記差動カム７２の外周に当接する従動子７６を備えて揺動可能に支持された差動調節腕７７が設けられており、該差動調節腕７７の他端７７ａは送りロッド４４に回動可能に連結されると共に前記従動子７６を差動カム７２に押圧するばね７８が装着されている。
【００２５】
差動送り調節の作用としては、前記送り量調節操作部６０の回動操作により主送り台１８側の主送り調節リンク３５が回動したとき、副送り台２８側の副送り調節リンク３９も回動され、主送り台１８及び副送り台２８の送り量は所定の比率で調節が行われる。以下、この調節作用について詳述する。
【００２６】
まず、前記送り量調節操作部６０を操作することにより、前記送りロッド４４が図２及び図３の時計方向に回動して、送り腕４３，軸部４２，主送り伝達腕４０及び主送り調節リンク３５の回動を介して主送り水平リンク１６の運動中心（回転中心）を変え、主送りリンク３２，主送り揺動腕１９等を介して主送り台１８の水平運動量が調節される。同時に、前記送り腕４３，連結ロッド４５，差動変換腕４９，副送り伝達腕５１，軸杆５２，副送り連結腕５３，副送り連結ロッド５４，副送り調節腕４１及び副送り調節リンク３９等の回動を介して副送り水平リンク１７の運動中心（回転中心）を変え、図８（Ａ）又は（Ｂ）のように、副送りリンク３６，副送り揺動腕２２等を介して副送り台２８の水平運動量が調節される。
【００２７】
また、前記差動調節操作部６１を操作することにより、差動カム７２が回動し、ばね７８を抗して差動調節腕７７が図２及び図３において時計方向又は反時計方向に適宜揺動し、前記差動ロッド４６が図２乃至図６において適宜昇降する。例えば、図３及び図４（Ｂ）に示すように、差動ロッド４６が下降した場合には、差動変換腕４９の揺動角度が大きくなり、これによって、副送り伝達腕５１の揺動角度を大きくし、この揺動角の大により、軸杆５２，副送り連結腕５３，副送り連結ロッド５４，副送り調節腕４１及び副送り調節リンク３９等の回動を介して副送り水平リンク１７の運動中心（回転中心）を変え、副送りリンク３６，副送り揺動腕２２等を介して副送り台２８の水平運動量を適宜増加することができる。
【００２８】
また、図４（Ａ）に示すように、前記差動調節操作部６１を操作することにより、差動ロッド４６が上昇した場合には、差動変換腕４９の揺動角度が小さくなり、これによって、副送り伝達腕５１の揺動角度を小さくし、この揺動角の小により、軸杆５２，副送り連結腕５３，副送り連結ロッド５４，副送り調節腕４１及び副送り調節リンク３９等の回動を介して副送り水平リンク１７の運動中心（回転中心）を変え、副送りリンク３６，副送り揺動腕２２等を介して副送り台２８の水平運動量を適宜減少させることができる。
【００２９】
以上のように、前記送り量調節操作部６０の操作による送り腕４３の揺動角で主送り台１８を所定の送り量としても、差動調節操作部６１の操作による差動変換腕４９の揺動角の増減により、副送り台２８の送り量を適宜増減でき、さらに、送り量調節操作部６０の操作による送り腕４３の揺動角に関係して、差動変換腕４９の揺動角を増減して補正値を加え、これによって、主送り台１８と副送り台２８の送り量の比率を適宜変えることができるのみならず、特に、総合的な送り量を、その主送り台１８の送り量として所定の値にできる。
【００３０】
【発明の効果】
請求項１の発明では、主送り台１８の送り量と副送り台２８の送り量との比率を適宜変えることができるのみならず、特に、比率を変えても、総合的な送り量を主送り台１８の送り量は常時所定の値にできる利点がある。
【００３１】
また、副送り台２８の送り量は、前記主送り台１８の送り量は送り腕４３の揺動角度っを制御し、補正送り量を発生させるように構成されている。このため、ある一定送り量に対して差動比を変えた場合、主送り量は変化することなく副送り量のみ変化することとなるが、そのときの『差動比を変えると送り量が変わる』という点を補正送り量ができるリンク機構にて解決できる。即ち、差動送り量を適宜変化させても、主送り量を規制する送り腕４３に連動する差動変換腕４９の揺動角度を制御するようにしたので、総合的な送り量を主送り量と実質的に同一にできる大きな利点がある。さらには、差動送り調節機構の操作部から差動送り機構までの調節伝達機構の構造を簡単にしたものである。
【００３２】
また、請求項２の発明では、差動調節操作部６１の操作にて昇降する差動ロッド４６に設けたピン４７の位置にて、前記送り腕４３に連動する差動変換腕４９の揺動角度を制御するようにしたので、主送り台１８の送り量は送り腕４３の揺動角度にて、副送り台２８の送り量は差動変換腕４９の揺動角度にてそれぞれ決定されるため、主送り台１８は送り量の構成は、副送り台２８の送り量の構成とは夫々独立して運動が与えられている。また、前記主送り歯１２と副送り歯１３とを協動するようにしてなるミシンの差動送り調節装置としたことにより、ミシンの差動送り調節機構を、主送り歯１２を固着する主送り台１８及び副送り歯１３を固着する副送り台２８から独立化した構成とし、そのときの『差動比を変えると送り量が変わる』という点を補正送り量としてでき、送り量を所定にできるし、さらに、簡単なる構成のリンク等で確実なる差動送りが提供できる利点がある。
【図面の簡単な説明】
【図１】本発明の斜視図
【図２】本発明の要部正面図
【図３】図２の作用状態を示す要部正面図
【図４】（Ａ）は差動変換腕の揺動角度を小さくした状態の一部正面図
（Ｂ）は差動変換腕の揺動角度を大きくした状態の一部正面図
【図５】要部部材の分解斜視図
【図６】主要部材の斜視図
【図７】主送り台及び副送り台を協動させる部材の分解斜視図
【図８】（Ａ）及び（Ｂ）は主送り台及び副送り台を協動させている状態の要部正面図
【符号の説明】
１２…主送り歯
１３…副送り歯
１４…主送りカム
１５…副送りカム
１６…主送り水平リンク
１７…副送り水平リンク
１８…主送り台
２８…副送り台
４３…送り腕
４６…差動ロッド
４７…ピン
４９…差動変換腕
６０…送り量調節操作部
６１…差動調節操作部[0001]
[Industrial application fields]
The present invention relates to a differential feed adjusting device for a sewing machine in which a total feed amount does not change even if a differential ratio is changed in a differential feed device for a small lock sewing machine.
[0002]
[Prior art]
In a conventional sewing machine, a feed mechanism having a differential feed function has a feed element separated into a main feed element and a sub-feed element, and each feed element has a feed dog, that is, a main feed dog and a sub-feed dog. And each feed element possesses a feed adjustment mechanism for controlling the respective feed amounts in the two feed elements, and further has a coupling mechanism for connecting and linking the two feed adjustment mechanisms. When the feed amount is adjusted by interposing, both the main and sub feed mechanisms are controlled, and when the differential amount is adjusted, only the sub feed mechanism is controlled. As a result, a feed having a differential feed function is generated and controlled.
[0003]
[Problems to be solved by the invention]
However, in the feed generation mechanism having the differential feed function, when the differential ratio is changed with respect to a certain feed amount, the main feed amount does not change but only the sub feed amount changes. As a result, the total feed amount changes even though the change in the feed amount is not intended. That is, “the feed amount changes when the differential ratio is changed”. It is desired to solve this problem.
[0004]
[Means for Solving the Problems]
Therefore, the inventor has intensively and researched to solve the above-mentioned problems. As a result, the inventor devised a mechanism for generating the movement of the main feed base via the main feed cam and the main feed horizontal link, and the auxiliary feed. A mechanism for generating movement of the sub-feed base via the cam and the sub-feed horizontal link; a feed adjusting mechanism for changing the feed amount of the main feed base; and a sub-feed base for the feed amount of the main feed base And a differential adjustment mechanism for changing the differential amount of the differential feed, wherein the feed adjustment mechanism is a feed amount adjustment operation unit, and the differential adjustment mechanism is a differential adjustment operation. Each of which can be adjusted by the control unit, the swing angle of the feed arm which can be swung by the operation of the feed amount adjustment operation unit is controlled, and the differential rod which is raised and lowered by the operation of the differential adjustment operation unit, By controlling the swing angle of the differential conversion arm linked to the feed arm, A sewing machine differential feed adjustment device characterized in that the total feed amount does not change even if the differential ratio is changed by cooperating the main feed dog and the sub feed dog. The above-mentioned problem has been solved. A mechanism for generating movement of the main feed base via the main feed cam and the main feed horizontal link; and a mechanism for generating movement of the sub feed base via the sub-feed cam and the sub-feed horizontal link; A feed adjustment mechanism for changing the feed amount of the main feed dog provided on the main feed base and a feed amount of the sub feed dog provided on the sub feed stand are changed, and the differential amount of the differential feed is changed. A differential adjustment mechanism for adjusting the feed amount, the feed adjustment mechanism can be adjusted by a feed amount adjustment operation unit, and the differential adjustment mechanism can be adjusted by a differential adjustment operation unit. The swing angle of the feed arm that can be swung can be controlled, and the differential conversion interlocked with the feed arm at the position of the pin provided on the differential rod that moves up and down by the operation of the differential adjustment operation unit The arm swing angle can be controlled, and the main feed dog and auxiliary feed dog can cooperate with each other. Be changed differential ratio Te, by the overall feed amount perforation of the differential feed adjusting apparatus characterized by is as unchanged it was, which solves the above problems.
[0005]
[Action]
The present invention is provided with a feed adjustment mechanism and a differential adjustment mechanism, and when a link mechanism is provided to change the differential ratio, the differential mechanism and the correction mechanism are provided. Without changing the feed display, the feed adjusting mechanism can be automatically changed to obtain a predetermined differential ratio at a predetermined feed amount.
[0006]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of the sewing machine (lock sewing machine) according to the present invention. A sewing machine frame A is composed of an arm machine frame 1 and a bed machine frame 2, and the bed machine frame 2 has a motor (not shown). A drive shaft 3 (see FIG. 7) driven by is supported, and a pulley 4 is fixed to the outer end of the machine frame of the drive shaft 3. A needle bar 5 is supported on the arm machine frame 1 so as to be movable up and down, and is movably provided by the drive shaft 3 via a transmission shaft.
[0007]
A plurality of thread tensioners 6, 6... Are disposed on the entire surface of the arm machine frame 1, and the thread tensioners 6, 6... Are mounted on a thread stand 7 disposed behind the arm machine frame 1. The tension is applied to the thread from the thread spool. A loop cover 8 is pivotally mounted under the entire surface of the arm machine frame 1 so as to be freely opened and closed.
[0008]
A needle plate 9 is horizontally provided on the upper surface of the bed machine frame 2, and the periphery of the needle plate 9 is provided so as to be surrounded by a bed cover 10 that can rotate. The throat plate 9 is provided with a feed dog window 11 which is long drilled in the front-rear direction, and the feed dog window 11 is provided with a main feed dog 12 and a sub feed dog 13.
[0009]
Next, the differential feed mechanism will be described in detail. The differential feed mechanism is housed inside the box F. Specifically, as shown in FIG. 7, the main feed cam 14 and the sub feed cam 15 are respectively opposed to the drive shaft 3 as opposed to each other. 14a and 15a are screwed at appropriate intervals. One end 16a of the main feed horizontal link 16 is rotatably provided on the main feed cam 14, and one end 17a of the sub feed horizontal link 17 is rotatably provided on the sub feed cam 15.
[0010]
The main feed base 18 having the main feed dog 12 fixed to the front end portion is pivotally attached to the upper end portion 19a of the main feed swing arm 19 via the pin 20 at the rear end portion 18a, and the window portion 18b is provided at a substantially central vertical portion. The square piece 21 is provided in the window portion 18b so as to be slidable only in the front-rear direction. The main feed swing arm 19 together with the sub feed swing arm 22 is a shaft portion 25 provided horizontally on support plates 24, 24 erected on both sides of a swing arm base 23 fixed to the bed machine frame 2. Is swingably supported.
[0011]
One end 26 a of a sub-feed base link 26 is connected to the upper end 22 a of the sub-feed swing arm 22 via a pin 27. The auxiliary feed base 28 having the auxiliary feed dog 13 fixed to the front end thereof has a rear end 28 a connected to the other end 26 b of the auxiliary feed base link 26 via a pin 29. A square piece 21 that is wide and has a protruding portion from the window portion 18b is fitted in the window portion 18b of the main feed base 18 so as to be slidable in the front-rear direction.
[0012]
The auxiliary feed base 28 is sandwiched between the lower surface of the press plate 30 fixed to the upper surface of the main feed base 18 and the upper surface 21a of the square piece 21 protruding from the window 18b so as to slide in the front-rear direction. Has been. The square piece 21 is formed with a hole 21b in the center, and the hole 21b is fitted to a vertical feed cam 15b provided integrally with the auxiliary feed cam 15. On both side surfaces of the square piece 21, washers 31, 31 fitted on the drive shaft 3 are arranged, and protrusions 31 a, 31 a on both sides of the washer 31 are formed in recesses 21 c, 21 c formed in the square piece 21. What is fitted and stopped from rotating is mounted between the end surface 14 a of the main feed cam 14 and the end surface 15 a of the sub-feed cam 15.
[0013]
One end 32a of the main feed link 32 is connected via a pin 33 to the other end 16b of the main feed horizontal link 16 fitted with one end 16a on the outer periphery of the main feed cam 14. Reference numeral 32 b is connected to the lower end 19 b of the main feed swing arm 19 by a pin 34. One end 35a of the main feed adjusting link 35 is rotatably supported on the pin 33.
[0014]
Further, in the sub-feed horizontal link 17 in which one end 17 a is fitted to the sub-feed cam 15, one end 36 a of the sub-feed link 36 is connected to the other end 17 b via a pin 37. The other end 36 b is connected to the lower end 22 b of the sub-feed swing arm 22 by a pin 38. On the pin 37, one end 39a of the sub-feed adjusting link 39 is rotatably supported.
[0015]
Next, the differential feed adjusting device will be described with reference to FIGS. P denotes a connecting axis line between the other end 35b of the main feed adjusting link 35 and the tip end portion 40a of the main feed transmitting arm 40. The other end 35b of the main feed adjusting link 35 and the tip end portion 40a of the main feed transmitting arm 40 are It is provided so that rotation is possible. Q indicates a connecting axis line between the other end 39b of the sub-feed adjusting link 39 and the tip 41a of the sub-feed adjusting arm 41, and the other end 39b of the sub-feed adjusting arm 39 and the tip 41a of the sub-feed adjusting arm 41. Is rotatably provided. As described above, the member of the box F is connected to the main feed transmission arm 40 or the sub feed adjustment arm 41 on the other side.
[0016]
The base end of the main feed transmission arm 40 is fixed to one end of a shaft portion 42 that is rotatably supported by the sewing machine frame A, and a feed arm 43 is fixed to the other end of the shaft portion 42. The feed arm 43 has a feed rod 44 connected to a feed amount adjusting operation unit 60 at one end 43a, and one end 45a of a connecting rod 45 connected to a differential feed adjusting device is connected to the other end 43b of the feed arm 43. It is linked movably. The other end 45b of the connecting rod 45 is rotatably provided at the lower end 49b of the differential conversion arm 49 of the differential feed adjusting device.
[0017]
A pin 47 is planted at the lower end of the differential rod 46 operated by the differential adjustment operation unit 61 of the differential feed adjusting device, and the pin 47 is a guide length of the fixed plate 48 fixed to the sewing machine frame A. It is loosely inserted into the hole 48a and is provided so as to be movable up and down only in the vertical direction in FIGS. A long hole 49 a provided in the middle of the differential conversion arm 49 is loosely inserted into the pin 47. With this configuration, when the feed amount adjusting operation unit 60 is rotationally adjusted and selected as a relatively fast main feed amount, the feed rod 44 in FIGS. 4 (A) and 4 (B) is more than that in FIG. The feeding arm 43 is rotated clockwise in FIGS. 4 (A) and 4 (B). Next, the differential adjustment operation unit 61 is rotationally adjusted, and the one with the slow sub-feed amount is selected as appropriate from the slow one. When the sub-feed amount is small, the differential rod 46 is slightly lowered (see FIG. 4A), and the differential conversion arm 49 is slightly rotated clockwise in FIG. The moving angle θ ₃ can be reduced. When faster secondary feed amount, in FIG. 4 (B), the lower the differential rod 46, it is possible to impart rotational by clockwise differential conversion arm 49 in FIG. 4 (B), the oscillation angle theta ₄ Can be increased. To increase in this way, the differential adjustment operation unit 61 is rotated and adjusted proportionally, but the rocking angle θ suddenly increases, and the total feed amount experimentally examined is the main feed amount. Can be the same as the amount.
[0018]
Further, if the main feed amount is selected as being relatively slow, in FIGS. 2 and 3, the feed rod 44 is in a raised position as compared with FIG. 2, and the feed arm 43 is in the state of FIG. 2. Yes. Next, the differential adjustment operation unit 61 is rotationally adjusted, and the one with the slow sub-feed amount is selected as appropriate from the slow one. When the sub-feed amount is intermediate, the differential rod 46 is lowered to the intermediate position of the long hole 49a (see FIG. 2), and the differential conversion arm 49 is slightly rotated counterclockwise in FIG. The swing angle θ ₁ can be reduced. When the sub-feed amount is increased, the differential rod 46 is lowered in FIG. 3 and the differential conversion arm 49 is rotated counterclockwise in FIG. 3, so that the swing angle θ ₂ can be increased. Although the swing angle θ increases in the counterclockwise direction in this manner is inversely proportional to the rotation of the differential adjustment operation unit 61, the swing angle θ suddenly increases in the negative direction. The total feed amount examined can be made the same as the main feed amount.
[0019]
As described above, in particular, when the main feed amount is large, differential adjustment is performed, and when a large sub feed amount is output, the value is larger than the predetermined sub feed amount, taking into account slipping and the like. The total feed amount can be made equal to the set main feed amount. In addition, when the main feed amount is small, differential adjustment is performed, and when a small sub feed amount is output, the value is smaller than the predetermined sub feed amount. Can be made equal to the set main feed amount.
[0020]
A pin 50 provided on the upper end 49 c of the differential conversion arm 49 is pivotally supported on the other end 51 a of the sub-feed transmission arm 51. The lower end (base portion) 51 b is fixed to one end of a shaft rod 52 that is rotatably supported by the sewing machine frame A, and the base portion of the auxiliary feed connecting arm 53 is fixed to the other end of the shaft rod 52. The other end 41 b of the sub-feed adjusting arm 41 is connected to the tip end portion 53 a of the sub-feed connecting arm 53 via a sub-feed connecting rod 54 so as to be rotatable.
[0021]
Details of the differential feed adjustment device are described below with reference to FIGS. A feed cam shaft 63 is supported on the adjustment stand 62 fixed to the sewing machine frame A. The feed cam shaft 63 is provided with a feed cam 64 that is interlocked with the rotation of the feed amount adjusting operation unit 60. The feed cam 64 is integrally provided with a disc 65 having a fine groove such as knurl formed on its outer periphery, and a plate provided on the adjusting table 62 with respect to the outer periphery of the disc 65. One end of the spring 66 is pressed and the feed cam 64 is restricted from rotating.
[0022]
The adjustment base 62 is supported by a shaft portion 67 and includes a feed adjustment arm 69 that is swingably supported by a follower 68 that is adjustably fixed to one end and has a tip abutting against the outer periphery of the feed cam 64. The other end 69a of the feed adjusting arm 69 is rotatably connected to the feed rod 44, and a spring 70 that presses the follower 68 against the feed cam 64 is mounted.
[0023]
In addition, a differential cam shaft 71 is supported on the adjustment base 62, and a differential cam 72 is provided on the differential cam shaft 71 in conjunction with the rotation of the differential adjustment operation unit 61. The moving cam 72 is integrally provided with a disc 73 having a fine groove such as knurl formed on the outer periphery thereof, and a leaf spring provided on the adjusting table 62 with respect to the outer periphery of the disc 73. One end of 74 is pressed, and the rotation of the differential cam 72 is restricted so as to have resistance.
[0024]
Further, the adjustment base 62 is supported by a shaft portion 75, and is provided with a follower 76 that is adjustably fixed to one end and abutted with the outer periphery of the differential cam 72. An adjusting arm 77 is provided, and the other end 77a of the differential adjusting arm 77 is rotatably connected to the feed rod 44, and a spring 78 that presses the follower 76 against the differential cam 72 is mounted. Yes.
[0025]
As an effect of the differential feed adjustment, when the main feed adjustment link 35 on the main feed base 18 side is turned by the turning operation of the feed amount adjustment operation section 60, the sub-feed adjustment link 39 on the sub feed base 28 side is also used. The feed amount of the main feed base 18 and the sub feed base 28 is adjusted at a predetermined ratio. Hereinafter, this adjusting action will be described in detail.
[0026]
First, by operating the feed amount adjusting operation unit 60, the feed rod 44 is rotated in the clockwise direction in FIGS. 2 and 3, and the feed arm 43, the shaft part 42, the main feed transmission arm 40, and the main feed are rotated. The movement center (rotation center) of the main feed horizontal link 16 is changed through the rotation of the adjustment link 35, and the horizontal momentum of the main feed base 18 is adjusted through the main feed link 32, the main feed swinging arm 19, and the like. . At the same time, the feed arm 43, the connecting rod 45, the differential conversion arm 49, the auxiliary feed transmitting arm 51, the shaft rod 52, the auxiliary feed connecting arm 53, the auxiliary feed connecting rod 54, the auxiliary feed adjusting arm 41, and the auxiliary feed adjusting link 39. The center of rotation (rotation center) of the sub-feed horizontal link 17 is changed through rotation, and the like, via the sub-feed link 36, the sub-feed swing arm 22 and the like as shown in FIG. The horizontal momentum of the auxiliary feed base 28 is adjusted.
[0027]
Further, by operating the differential adjustment operation unit 61, the differential cam 72 is rotated, and the differential adjustment arm 77 is appropriately rotated clockwise or counterclockwise in FIGS. The differential rod 46 moves up and down as appropriate in FIGS. For example, as shown in FIGS. 3 and 4B, when the differential rod 46 is lowered, the swing angle of the differential conversion arm 49 is increased, and thereby the swing of the auxiliary feed transmission arm 51 is increased. The angle is increased, and by the rotation of the shaft rod 52, the sub-feed connecting arm 53, the sub-feed connecting rod 54, the sub-feed adjusting arm 41, the sub-feed adjusting link 39, etc. By changing the movement center (rotation center) of the link 17, the horizontal momentum of the auxiliary feed base 28 can be appropriately increased via the auxiliary feed link 36, the auxiliary feed swinging arm 22, and the like.
[0028]
As shown in FIG. 4A, when the differential rod 46 is lifted by operating the differential adjustment operation unit 61, the swing angle of the differential conversion arm 49 becomes small. Thus, the swing angle of the sub-feed transmission arm 51 is decreased, and the shaft shaft 52, the sub-feed connecting arm 53, the sub-feed connecting rod 54, the sub-feed adjusting arm 41, and the sub-feed adjusting link 39 are reduced according to the small swing angle. The movement center (rotation center) of the sub-feed horizontal link 17 is changed through the rotation of the sub-feed, etc., and the horizontal momentum of the sub-feed base 28 is appropriately reduced through the sub-feed link 36, the sub-feed swing arm 22 and the like. it can.
[0029]
As described above, even if the main feed base 18 is set to a predetermined feed amount by the swing angle of the feed arm 43 by the operation of the feed amount adjustment operation unit 60, the differential conversion arm 49 by the operation of the differential adjustment operation unit 61 is used. By increasing or decreasing the swing angle, the feed amount of the auxiliary feed base 28 can be increased or decreased as appropriate. Further, the swing of the differential conversion arm 49 is related to the swing angle of the feed arm 43 by the operation of the feed amount adjusting operation unit 60. The correction value is added by increasing / decreasing the angle so that the ratio of the feed amount of the main feed base 18 and the sub-feed base 28 can be changed as appropriate. In particular, the total feed amount can be changed to the main feed base. The feed amount of 18 can be set to a predetermined value.
[0030]
【The invention's effect】
In the first aspect of the invention, not only can the ratio of the feed amount of the main feed base 18 and the feed amount of the sub-feed base 28 be changed as appropriate, but the overall feed amount is not limited even if the ratio is changed. There is an advantage that the feed amount of the feed base 18 can always be set to a predetermined value.
[0031]
The feed amount of the sub feed base 28 is configured to control the swing angle of the feed arm 43 to generate the corrected feed amount. For this reason, when the differential ratio is changed for a certain fixed feed amount, the main feed amount does not change but only the sub feed amount changes. It can be solved by a link mechanism that can adjust the feed amount. That is, even if the differential feed amount is appropriately changed, the swing angle of the differential conversion arm 49 linked to the feed arm 43 that regulates the main feed amount is controlled. There is a great advantage that it can be made substantially the same as the quantity. Furthermore, the structure of the adjustment transmission mechanism from the operation unit of the differential feed adjustment mechanism to the differential feed mechanism is simplified.
[0032]
According to the second aspect of the present invention, the swing of the differential conversion arm 49 interlocked with the feed arm 43 at the position of the pin 47 provided on the differential rod 46 that moves up and down by the operation of the differential adjustment operation unit 61. Since the angle is controlled, the feed amount of the main feed base 18 is determined by the swing angle of the feed arm 43, and the feed amount of the sub feed base 28 is determined by the swing angle of the differential conversion arm 49. Therefore, the main feed base 18 is given a motion independently of the feed amount configuration of the sub-feed stand 28. Further, since the sewing machine differential feed adjusting device is configured to cooperate with the main feed dog 12 and the sub feed dog 13, the differential feed adjusting mechanism of the sewing machine can be used as the main feed dog 12 to which the main feed dog 12 is fixed. The feed base 18 and the sub feed base 13 to which the sub feed teeth 13 are fixed are made independent, and the point that “the feed amount changes when the differential ratio is changed” at that time can be set as a corrected feed amount. Further, there is an advantage that reliable differential feed can be provided by a link having a simple configuration.
[Brief description of the drawings]
FIG. 1 is a perspective view of the present invention. FIG. 2 is a front view of a main part of the present invention. FIG. 3 is a front view of a main part showing the operation state of FIG. Partial front view (B) in a state where the angle is reduced is a partial front view in a state where the swing angle of the differential conversion arm is increased. FIG. 5 is an exploded perspective view of a main part member. FIG. 7 is an exploded perspective view of a member that cooperates with the main feed base and the sub-feed base. FIGS. 8A and 8B are main parts in a state where the main feed base and the sub-feed base are cooperated. Front view [Explanation of symbols]
12 ... Main feed dog 13 ... Sub feed dog 14 ... Main feed cam 15 ... Sub feed cam 16 ... Main feed horizontal link 17 ... Sub feed horizontal link 18 ... Main feed table 28 ... Sub feed table 43 ... Feed arm 46 ... Differential Rod 47 ... Pin 49 ... Differential conversion arm 60 ... Feed amount adjustment operation part 61 ... Differential adjustment operation part

Claims

A mechanism for generating movement of the main feed base via the main feed cam and the main feed horizontal link, a mechanism for generating movement of the sub feed base via the sub feed cam and the sub feed horizontal link, A feed adjustment mechanism for changing the feed amount of the feed base, and a differential adjustment mechanism for changing the differential amount of the differential feed that changes the feed amount of the sub-feed base relative to the feed amount of the main feed base. The feed adjustment mechanism can be adjusted by a feed amount adjustment operation unit, the differential adjustment mechanism can be adjusted by a differential adjustment operation unit, and the feed arm can be swung by operation of the feed amount adjustment operation unit. The main feed dog and the main feed dog are controlled by controlling the swing angle of the differential conversion arm interlocked with the feed arm by a differential rod that moves up and down by operation of the differential adjustment operation unit. Even if the differential ratio is changed by cooperating with the auxiliary feed dog, the total feed amount Unchanging manner made possible by the differential feed adjusting device of a sewing machine according to claim.

A mechanism for generating movement of the main feed base via the main feed cam and the main feed horizontal link, a mechanism for generating movement of the sub feed base via the sub feed cam and the sub feed horizontal link, A difference for changing the differential amount of the feed adjustment mechanism for changing the feed amount of the main feed dog provided on the feed base and the differential feed for changing the feed amount of the sub feed dog provided on the sub-feed stand. The feed adjustment mechanism can be adjusted by a feed adjustment operation unit, and the differential adjustment mechanism can be adjusted by a differential adjustment operation unit. The swing angle of the movable feed arm can be controlled, and the swing of the differential conversion arm interlocked with the feed arm at the position of the pin provided on the differential rod that moves up and down by the operation of the differential adjustment operation unit. The movement angle can be controlled, and the main feed dog and the sub feed dog cooperate to make a differential. Be changed, overall feed rate that is as unchanged, the differential feed adjusting device of a sewing machine according to claim.