JP4340942B2

JP4340942B2 - Hole sewing machine

Info

Publication number: JP4340942B2
Application number: JP2000219095A
Authority: JP
Inventors: 悦造野村; 健一橋本
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2000-07-19
Filing date: 2000-07-19
Publication date: 2009-10-07
Anticipated expiration: 2020-07-19
Also published as: JP2002035459A

Description

【０００１】
【発明の属する技術分野】
本発明は穴かがりミシンに関し、特に、上糸切断機構の糸切り部材を切断位置と縫製開始位置と退避位置とに亙って切換え可能に構成した穴かがりミシンに関する。
【０００２】
【従来の技術】
従来、穴かがりミシンには、縫目形成機構、布送り機構、布押え昇降機構、ボタン穴形成機構等が設けられている。布押え昇降機構により布押えが昇降され、布押えにより布が布送り機構の送り部材に押えられた状態で、布送り機構により布が送り部材及び布押えと一体的に送られる。その布に縫目形成機構により穴かがり縫目が形成され、穴かがり縫目の縫製後又は縫製途中に、ボタン穴形成機構により穴かがり縫目の内側にボタン穴が形成される。
【０００３】
布に穴かがり縫目とボタン穴を形成した後、次の穴かがり縫目を縫製するために、布押え昇降機構により布押えを上昇させ、布をずらしたり取替えたりしてセットするが、その前に、加工布に形成された穴かがり縫目と縫針の間の上糸を切断しなければならない。従来、この上糸切断を穴かがり縫目の形成後に自動的に行う上糸切断機構は実用に供されている。
【０００４】
従来の上糸切断機構は１対の刃を含む糸切り部材を有し、この糸切り部材が縫針近傍の切断位置において縫針から延びる上糸を切断する。但し、この切断位置に位置する糸切り部材は昇降する縫針と干渉するため、また、ボタン穴形成機構の下降するカッターとも干渉するため、穴かがり縫目の縫製開始前に、糸切り部材は切断位置から退避位置に切換えられる。
【０００５】
通常、糸切り部材が退避位置から切断位置へ移動する際に、１対の刃が機械的に閉じられ上糸を切断して保持し、糸切り部材が切断位置から退避位置へ移動する際に、１対の刃が機械的に開かれ保持している上糸を開放し、糸切り部材が退避位置に位置しているときには、必ず上糸を開放した状態となる。尚、従来の上糸切断機構は専用のアクチュエータを有し、その他の機構と独立に駆動される。
【０００６】
また、特開平１１−９８６０号公報の穴かがりミシンでは、上糸切断機構が、１対の刃を有する糸切り部材、糸切り部材を先端部に連結した糸切り連結部材、揺動アーム、揺動アームを揺動駆動するパルスモータ、糸切り連結部材と揺動アームを作動的に連結する回転軸及びローリングジョイントを有し、糸切り部材を、切断位置と、退避位置と、切断位置に対して縫製開始直後の布送り方向と反対側へ離隔した縫製開始位置とに位置切換え可能に構成されている。
【０００７】
但し、従来の上糸切断機構と同様に、糸切り部材が退避位置に位置しているときには、必ず上糸を開放した状態となる。尚、糸切り部材が上糸を切断して保持し縫製開始位置に切換えられた状態で縫製を開始し、その直後に、糸切り部材が１対の刃を開いて上糸を開放してから退避位置に切換わることにより、縫針と糸切り部材間の上糸を適度に張って穴かがり縫目の内側へ縫い込むことができ品質が向上する。また、この上糸切断機構も従来のものと同様に専用のアクチュエータ（パルスモータ）を有し、その他の機構と独立に駆動されるものである。
【０００８】
尚、本願出願人は、特開平１１−１５６０７３号公報において、布押え昇降機構と上糸切断機構と下糸切断機構を連動連結し、共通のパルスモータでこれら機構を駆動可能な穴かがりミシンを出願している。
【０００９】
【発明が解決しようとする課題】
従来の穴かがりミシンでは、糸切り部材が退避位置に切換わり上糸を開放して穴かがり縫目を縫製し、その穴かがり縫目の縫製後又は縫製途中に、ボタン穴形成機構によりボタン穴を形成する。しかし、糸切り部材が上糸を保持して退避位置に切換わることができないと、穴かがり縫目の縫製前にボタン穴を何ら問題なく形成することが難しい。
【００１０】
即ち、糸切り部材を退避位置に切換えて上糸を開放した状態でボタン穴を形成することは不可能でないが、そうした場合、上糸がボタン穴形成機構のカッターで切断されたり、上糸が縫針から抜けたり、余分な上糸がその後形成される穴かがり縫目に綺麗に縫い込まれずにはみ出す等の不都合が生じる虞がある。勿論、糸切り部材が上糸を保持した状態でボタン穴を形成しようとすると、その糸切り部材は切断位置に位置するためボタン穴形成機構のカッターと干渉する。
【００１１】
また、従来の穴かがりミシンでは、前述のように、基本的に穴かがり縫目の縫製前にボタン穴を形成することができず、穴かがり縫目の縫製後又は縫製途中にボタン穴を形成することになるため、ボタン穴形成機構のカッターにより、ボタン穴を形成するときに穴かがり縫目が切断される等の虞がある。
【００１２】
しかも、従来の穴かがりミシンでは、上糸切断機構が専用のアクチュエータを有し、その他の機構と独立に駆動されるものであるため、各機構に専用のアクチュエータを設け、場合によってセンサ類も多くなり、更に、これらアクチュエータを夫々駆動制御する制御プログラムを含む制御装置が必要になり、構造も複雑化するため製作コストが高価になるという問題がある。
【００１３】
特開平１１−９８６０号公報の穴かがりミシンの上糸切断機構では、糸切り部材が上糸を保持して退避位置に切換わることができないし、更に、専用のアクチュエータを有しその他の機構と独立に駆動されるものであるため、従来の上糸切断機構と同様の課題が生じる。
【００１４】
尚、本願出願人は、前述のように、布押え昇降機構と上糸切断機構と下糸切断機構とを連動連結し、共通のパルスモータでこれら機構を駆動可能な穴かがりミシンを出願しているが、上糸切断機構の糸切り部材が上糸を保持して退避位置に切り換わる技術は開示されていない。
【００１５】
本発明の目的は、穴かがり縫目の縫製前にボタン穴形成機構によりボタン穴を形成する為に、上糸切断機構の糸切り部材が上糸を保持して退避位置に切り換わるようにすること、布押え昇降機構と上糸切断機構とを連動連結して共通のパルスモータで駆動して構造を簡単化し製作コストを低減すること、等である。
【００１６】
【課題を解決するための手段】
請求項１の穴かがりミシンは、上糸切断機構とボタン穴形成機構とを備えた穴かがりミシンにおいて、前記上糸切断機構を駆動するアクチュエータを備え、前記上糸切断機構は、穴かがり縫目の形成後に縫針近傍の切断位置で上糸を切断して保持する糸切り部材と、先端部にこの糸切り部材を連結すると共に基端部が鉛直軸心回りに回動可能に枢支され且つ布送り方向へ移動可能な糸切り連結部材とを有すると共に、この糸切り部材を前記切断位置とボタン穴形成機構の布切断用カッターの移動軌跡付近の縫製開始位置とその移動軌跡から退避した退避位置とに亙って切換え可能に且つ穴かがり縫目の縫製中に糸切り部材を待機させる縫製中位置に切換え可能に構成され、布に次の穴かがり縫目の縫製前にボタン穴形成機構によりボタン穴を形成する為に、上糸切断機構の糸切り部材が上糸を保持して退避位置に切り換わるように構成し、布押え昇降機構と、この布押え昇降機構と上糸切断機構を連動連結する連動連結機構を備え、前記アクチュエータにより連動連結機構を介して布押え昇降機構と上糸切断機構を駆動し、布押え昇降機構の布押えにより布を押えた状態で、上糸切断機構の糸切り部材を退避位置に切り換え可能に構成し、前記糸切り部材を退避位置又は縫製中位置側へ付勢する付勢部材と、糸切り連結部材に設けられた第１係合部と、その第１係合部と係合可能な第１被係合部とを備え、これら第１係合部と第１被係合部が係合状態で糸切り部材を縫製開始位置に保持し非係合状態で糸切り部材の退避位置又は縫製中位置への切換えを許容し、前記布押えに連結されて布と一体的に布送り方向へ移動する送り腕に、糸切り連結部材の第１係合部を押動可能な押動部を設け、穴かがり縫目の縫製開始直後に、押動部が縫製開始位置に位置する糸切り連結部材の第１係合部を押動して第１係合部と第１被係合部との係合を解除することを特徴とするものである。
【００１７】
この穴かがりミシンでは、上糸切断機構を駆動するアクチュエータが設けられ、上糸切断機構は、穴かがり縫目の形成後に縫針近傍の切断位置で上糸を切断して保持する糸切り部材を有する。上糸切断機構により、糸切り部材が前記切断位置とボタン穴形成機構の布切断用カッターの移動軌跡付近の縫製開始位置とその移動軌跡から退避した退避位置とに亙って切換えられる。
【００１８】
布に次の穴かがり縫目の縫製前にボタン穴形成機構によりボタン穴を形成する為に、上糸切断機構の糸切り部材が上糸を保持して退避位置に切り換わるので、ボタン穴形成機構の下降する布切断用カッターが糸切り部材と干渉することなく布に落ちてボタン穴を形成することができる。糸切り部材で上糸を保持した状態で、ボタン穴を形成することができるため、布切断用カッターで上糸を切断したり、上糸が縫針から抜けたりする等の虞もなく、その後行われる穴かがり縫目の縫製に支障を来さない。
【００１９】
【００２０】
布押え昇降機構と上糸切断機構とを連動連結機構により連結し、その連動連結機構を介して共通のアクチュエータで駆動するため、構造を簡単化し製作コストの低減を図ることが可能となる。布押え昇降機構の布押えにより布を押えた状態で、糸切り部材を退避位置に切り換えることができるため、布を布切断用カッターに対応する位置に布送りして位置決めすることもでき、ボタン穴を確実に形成することができる。
【００２１】
糸切り部材を縫製中位置に切換えて待機させた状態で、糸切り部材と昇降する縫針とを干渉させずに、穴かがり縫目の縫製を行うことができる。
糸切り連結部材の鉛直軸心回りの回動と布送り方向への移動を介して、糸切り部材を、切断位置、縫製開始位置、退避位置、縫製中位置に亙って切換えることができる。
第１係合部と第１被係合部が係合した状態で糸切り部材を縫製開始位置に保持し、第１係合部と第１被係合部が係合解除した状態で、付勢部材により糸切り部材を退避位置又は縫製中位置に切換えることができる。
穴かがり縫目の縫製開始直後、布送り方向へ移動する送り腕の押動部が糸切り連結部材の第１係合部を押動し、第１係合部と第１被係合部との係合を解除して糸切り部材を縫製中位置に切換えることができる。
【００２２】
請求項２の穴かがりミシンは、請求項１の発明において、前記糸切り部材は１対の刃を有し、上糸切断機構は、１対の開いた刃を切断位置で閉じ、１対の閉じた刃を縫製開始位置又は縫製中位置で開ける刃開閉機構を含むことを特徴とするものである。刃開閉機構により、糸切り部材の１対の開いた刃が切断位置で閉じて上糸を確実に切断して保持でき、１対の閉じた刃が縫製開始位置又は縫製中位置で開いて上糸を確実に開放でき、余分な上糸を穴かがり縫目の内側に綺麗に縫い込むことができるため品質が向上する。
【００２３】
【００２４】
請求項３の穴かがりミシンは、請求項１の発明において、前記連動連結機構は、前記アクチュエータにより駆動される連動連結部材と、この連動連結部材の駆動力を糸切り連結部材に伝達して糸切り連結部材を布送り方向へ駆動する第１駆動系を含むことを特徴とするものである。この第１駆動系により、連動連結部材の駆動力を糸切り連結部材に伝達して、糸切り連結部材を布送り方向へ確実に駆動することができる。
【００２５】
【００２６】
【００２７】
請求項４の穴かがりミシンは、請求項１の発明において、前記糸切り連結部材に設けられた第２係合部と、その第２係合部と係合可能な第２被係合部とを備え、これら第２係合部と第２被係合部が係合した状態で糸切り部材を退避位置と切断位置と縫製中位置の何れか１つの位置に保持することを特徴とするものである。第２係合部と第２被係合部とを係合させて、糸切り部材を退避位置と切断位置と縫製中位置に確実に切換えることができる。
【００２８】
請求項５の穴かがりミシンは、請求項４の発明において、前記第２係合部は段部を有し、この段部と第２被係合部が係合すると、糸切り連結部材が切断位置に切換わることを特徴とするものである。第１係合部に対して第２被係合部を布送り方向へ移動させ、第２係合部の段部と第２被係合部とを係合させて、糸切り連結部材を切断位置に移動させ切換えることができる。
【００２９】
請求項６の穴かがりミシンは、請求項５の発明において、前記連動連結機構は、前記連動連結部材の駆動力を第２被係合部に伝達して第２被係合部を布送り方向へ駆動する第２駆動系を含むことを特徴とするものである。この第２駆動系により第２被係合部を布送り方向へ駆動し、第２係合部に対する第２被係合部の係合位置を変化させて段部にも係合させることができる。
【００３０】
請求項７の穴かがりミシンは、請求項１〜４の何れかにおいて、前記アクチュエータがパルスモータであることを特徴とするものである。パルスモータを駆動制御し、その駆動量に応じて、布押え昇降機構と上糸切断機構を適切なタイミングで駆動し、また、上糸切断機構において、糸切り部材の切断位置、退避位置、縫製開始位置、縫製中位置への切換えを確実に行うことができる。
【００３１】
【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、例えば図４に示すように、加工布１に穴かがり縫目２とボタン穴３を形成する穴かがりミシンに、本発明を適用した場合の一例である。尚、図１、図２の前後左右を前後左右として説明する。
【００３２】
図１〜図３、図１１に示すように、穴かがりミシンＭは、ベッド部５と脚柱部６とアーム部７を有すると共に、縫目形成機構１０、布送り機構１１、布押え昇降機構１２、上糸切断機構１３、下糸切断機構１４、ボタン穴形成機構１５を備えている。布押え昇降機構１２により布押え２２が昇降駆動され、布押え２２により加工布１が布送り機構１１の送り部材２０に押えられ、この状態で、布送り機構１１により加工布１が送り部材２０及び布押え２２と一体的に前後方向に送られ、その加工布１に縫目形成機構１０により穴かがり縫目２が形成される。
【００３３】
穴かがり縫目２の縫製前又は縫製途中又は縫製後に、ボタン穴形成機構１５により穴かがり縫目２の内側にボタン穴３が形成される。加工布１に穴かがり縫目２とボタン穴３が形成されると、上糸切断機構１３により上糸が切断されると共に下糸切断機構１４により下糸が切断され、その後、布押え昇降機構１２により布押え２２が上昇され、この状態で、加工布１をずらしたり取替えたりしてセットすることができる。
【００３４】
以下、各機構１０〜１５について説明する。縫目形成機構１０は、図３に示すように、針棒１６、縫針１７、天秤（図示略）、回転釜からなる糸捕捉器（図示略）等を有する。針棒１６はミシンモータ１８（図１１参照）により回転駆動される上軸１９等を介して昇降駆動され、針棒１６の下端に装着された縫針１７に供給される上糸が糸捕捉器により捕捉され、下糸と交絡して縫目が形成される。
【００３５】
布送り機構１１は加工布１を前後方向へのみ布送りするものであるため、針棒１６と縫針１７が左右に針振りされて、穴かがり縫目２（千鳥縫目と閂止め縫目等）が縫製可能になる。尚、脚柱部６の後側に突出した上軸１９の後端部に、回動操作部材１８ａが固着され、この回動操作部材１８ａとミシンモータ１８により駆動される駆動プーリ（図示略）にタイミングベルト１８ｂが掛装されて、ミシンモータ１８の駆動力が上軸１９に伝達される。
【００３６】
布送り機構１１は、ベッド部５に前後方向に移動自在にガイド支持された前後方向に長い矩形板状の送り部材２０と、この送り部材２０を前後方向に送り駆動する布送りモータ２１（図１１参照）を有する。布押え２２は送り腕２３の前端部に連結され、加工布１のうち穴かがり縫目２の形成予定部の外周側部分を送り部材２０に枠状に押える。
【００３７】
送り腕２３は上方凸状に湾曲した形状で前後方向に長く、その後端部分は脚柱部６の近くまで達している。送り腕２３の後端部は送り部材２０に連結された可動体（図示略）に左右軸心回りに回動可能に連結されている。これにより、布押え２２は送り腕２３及び送り部材２０と一体的に前後に移動し、送り腕２３と一体的に昇降する。
【００３８】
さて、この穴かがりミシンＭには、布押え昇降機構１２と上糸切断機構１３と下糸切断機構１４を連動連結する連動連結機構５０と、この連動連結機構５０を介して布押え昇降機構１２と上糸切断機構１３と下糸切断機構１４を駆動する共通のアクチュエータとしてのパルスモータ５１が設けられている。尚、この連動連結機構５０については後で詳細に説明する。
【００３９】
布押え昇降機構１２は上下に長い連結ロッド２５を有し、その連結ロッド２５の下端部が送り腕２３の前端部に前後方向へ相対移動可能に且つ上下方向へ相対移動不能に連結され、この連結ロッド２５が連動連結機構５０を介して昇降駆動される。
【００４０】
上糸切断機構１３は、図１、図５、図７〜図９に示すように、加工布１に穴かがり縫目２とボタン穴３の形成後に縫針１７近傍の切断位置（図１３参照）で上糸を切断して保持する糸切り部材３０と、この糸切り部材３０を前端部に連結し且つ後端部が鉛直な枢支軸３２に（鉛直軸心回りに）回動可能に枢支され且つ布送り方向（前後方向）へ移動可能に支持された糸切り連結部材３１を有する。
【００４１】
この上糸切断機構１３は、糸切り部材３０を前記切断位置と、この切断位置に対して縫製開始時における布送り方向（前方）と反対側（後側）に位置しボタン穴形成機構１５の布切断用カッター４８の移動軌跡付近の縫製開始位置（図１４参照）と、切断位置の左側に位置し前記移動軌跡から退避した退避位置（図１２、図１６参照）と、縫製開始位置の左側かつ切断位置の後側に位置し穴かがり縫目２の縫製中に待機させる縫製中位置（図１５参照）の４位置に亙って位置切換え可能に構成されている。
【００４２】
糸切り部材３０は１対の刃３０ａ，３０ｂ（固定刃３０ａと可動刃３０ｂ）と糸保持バネ３０ｃを有し、固定刃３０ａに対して可動刃３０ｂが開閉可能に鉛直軸心回りに枢支されている。上糸切断機構１３は、１対の開いた刃３０ａ，３０ｂを切断位置で閉じ、１対の閉じた刃３０ａ，３０ｂを縫製開始位置又は縫製中位置で開ける刃開閉機構４０を含んでいる。
【００４３】
刃開閉機構４０は、図７、図９に示すように、可動刃３０ｂに形成されて上方へ立ち上がる被押動部４１と、この被押動部４１を押動して可動刃３０ｂを開ける第１押動部４２と、被押動部４１を押動して可動刃３０ｂを閉じる第２押動部４３とを有する。第１，第２押動部４２，４３は送り腕２３に固定的に設けられ、これらが相対的に移動し係合して、１対刃３０ａ，３０ｂが開閉される。
【００４４】
糸切り連結部材３１の後端部分には、上下１対の前後に長い長穴３１ａが形成され、これら長穴３１ａに１対の係合部材３４が夫々離脱不能に摺動自在に係合している。これら上下１対の係合部材３４は、前記枢支軸３２の下部に連結され、この枢支軸３２の上部がミシン機枠に回転自在に支持されている。これにより、糸切り連結部材３１の後端部が鉛直軸心回りに回動可能に枢支され前後方向へ移動可能に支持されている。
【００４５】
図５、図６に示すように、糸切り連結部材３１には、前記１対の長穴３１ａの他に、前後方向中央部よりも少し前側に前後に長い矩形の長穴３１ｂが形成され、長穴３１ａ，３１ｂの間に円弧穴３１ｃが形成され、糸切り連結部材３１の前後方向略中央部には可動部材３３が設けられている。
【００４６】
この可動部材３３の大部分は糸切り連結部材３１の左側に配設され、その可動部材３３に形成された前後方向向きの長穴３３ａに、糸切り連結部材３１に固着された２本のボルト３４の軸部が摺動自在に係合して、可動部材３３が糸切り連結部材３１に対して前後移動可能にガイド支持されている。可動部材３３は、前端から右方へ屈曲する被押動部３３ｂと、後端から左方へ屈曲する第１係合部３３ｃを有する。
【００４７】
被押動部３３ｂは、長穴３１ｂを挿通してその右側へ突出し、可動部材３３はこの長穴３１ｂの略長さ分のストロークだけ糸切り連結部材３１に対して前後に移動可能である。第１係合部３３ｃは、その後側において糸切り連結部材３１に固着されたバネ取付部材３５に引張りコイルバネ３６で連結され、可動部材３３が糸切り連結部材３１に対して後方へ付勢されている。
【００４８】
糸切り連結部材３１の前後方向中央部よりも前側の上端に右方へ延びるバネ取付部材３７が固着され、そのうちの右前端部が、糸切り連結部材３１の左側においてミシン機枠に引張りコイルバネ３８で連結されて、糸切り連結部材３１が枢支軸３２を中心として左側へ回動付勢されている。糸切り連結部材３１の上端部には左方へ全体的に張り出す板状の張出し部が形成され、その張出し部の前部に第２係合部３１ｄが形成され、第２係合部３１ｄはその前後方向中央部分において局部的に左方へ突出する段部３１ｅを有する。
【００４９】
ここで、連動連結機構５０の第２駆動系５８の第２連桿６６に、前記第１係合部３３ｃと係合可能な板状の第１被係合部４５と、前記第２係合部３１ｄと係合可能なコロからなる第２被係合部４６が装着されている。
【００５０】
第１係合部３３ｃと第１被係合部４５が係合状態で糸切り部材３０を縫製開始位置に保持し、非係合状態で糸切り部材３０の退避位置又は縫製中位置への切換えを許容する。即ち、糸切り部材３０は引張りコイルバネ３８により退避位置又は縫製中位置側へ付勢されているが、第２係合部３１ｄと第２被係合部４６が係合した状態で退避位置又切断位置又は縫製中位置に保持される。
【００５１】
前記ボタン穴形成機構１５は、図７、図８に示すように、布切断用カッター４８と、布切断用カッター４８を昇降駆動するソレノイドアクチュエータ４９（図１１参照）を有し、布切断用カッター４８を加工布１に落としてボタン穴３を形成する。布切断用カッター４８は針棒１６と縫針１７の直ぐ後方に位置に配設され、糸切り部材３０が縫製開始位置と切断位置に位置してる状態では、下降する布切断用カッター４８と干渉する。
【００５２】
尚、布切断用カッター４８の刃の長さが形成予定のボタン穴３の長さと同じ場合、加工布１に布切断用カッター４８を１回落としてボタン穴３を形成し、布切断用カッター４８の刃の長さが形成予定のボタン穴３の長さよりも短い場合、加工布１に布切断用カッター４８を複数回落としてボタン穴３を形成する。
【００５３】
次に、連動連結機構５０について説明する。連動連結機構５０は、押え昇降機構１２と上糸切断機構１３と下糸切断機構１４を連動連結する機構であり、図１〜図３、図１０に示すように、昇降板５２、鉛直レバー５３、Ｌ形リンク５４，５５、連動板５６（連動連結部材に相当する）、第１，第２駆動系５７，５８等を備えている。
【００５４】
パルスモータ５１は脚柱部６の上下方向略中央部に左右方向向きに設けられ、昇降板５２は１対のガイドロッド５２ａにより昇降自在にガイドされ、パルスモータ５１の出力軸に固着されたピニオン５１ａが、昇降板５２の下端部に形成されたラック５２ａに噛合している（図１０参照）。昇降板５２の２股部５２ｃが鉛直レバー５３の上端部の係合ピン５３ａに係合し、パルスモータ５１により昇降板５２と共に鉛直レバー５３が昇降駆動される。
【００５５】
１対のＬ形リンク５４，５５はアーム部７の前後に対称に配設され、夫々左右軸心回りに回動可能にミシン機枠に支持されている。連動板５６は前後に長い鉛直板状に形成され、１対のＬ形リンク５４，５５の間に配設され、その前後両端部が夫々のＬ形リンク５４，５５の上端部に回動自在に連結されている。
【００５６】
Ｌ形リンク５４の後端部に鉛直レバー５３の上端部が回動可能に連結され、Ｌ形リンク５５の前端部に布押え昇降機構１２の連結ロッド２５が連結されている。鉛直レバー５３が昇降されると、Ｌ形リンク５４，５５が回動され、連動板５６が少し昇降しつつ前後方向へ駆動される。連動板５６が前方へ移動すると布押え２２が下降し、連動板５６が後方へ移動すると布押え２２が上昇する。
【００５７】
第１駆動系５７は、連動板５６の駆動力を糸切り連結部材３１に伝達して糸切り連結部材３１を前後方向へ駆動する。第１駆動系５７は、ミシン機枠に左右軸心回りに枢支されたリンク部材６０と、リンク部材６０に上端部が固定的に連結された第１連桿６１を有し、リンク部材６０の先端部の係合ピン６０ａが連動板５６に形成された湾曲状の第１ガイド穴５６ａに係合し、第１連桿６１の下端部の係合ピン６１ａが糸切り連結部材３１の円弧穴３１ｃに係合している。
【００５８】
第２駆動系５８は、連動板５６の駆動力を第１，第２被係合部４５，４６に伝達して第１，第２被係合部４５，４６を略前後方向へ駆動する。第２駆動系５８は、ミシン機枠に左右軸心回りに枢支されたリンク部材６５と、リンク部材６５に上端部が固定的に連結された第２連桿６６を有し、リンク部材６５の先端部の係合ピン６５ａが連動板５６に形成された湾曲状の第２ガイド穴５６ｂに係合し、第２連桿６６の下端部に第１，第２被係合部４５，４６が設けられている。
【００５９】
尚、図示していないが、鉛直レバー５３の下端部分に下糸切断機構１４が連結されている。この下糸切断機構１４として、例えば、本願出願人が出願した穴かがりミシンの下糸切断機構（例えば、特開平１１−１５６０７３号公報の下糸切断機構）と同等のものを適用してもよい。
【００６０】
ここで、この穴かがりミシンＭの制御装置７０を含む制御系について、図１１のブロック図に基づいて簡単に説明する。制御装置７０は、ＣＰＵ７０ａとＲＯＭ７０ｂとＲＡＭ７０ｃと入出力インターフェース７０ｄを有し、これら７０ａ〜７０ｄはバス７０ｅにより互いに接続されている。入出力インターフェース７０ｄに、モータ１８，２１，５１の為の駆動回路７１ａ〜７１ｃと、ソレノイドアクチュエータ４９の為の駆動回路７１ｄと、フットペダル７２が接続されている。そして、これらモータ１８，２１，５１とソレノイドアクチュエータ４９を駆動制御し、次に説明する動作を達成するための制御プログラムがＲＯＭ７０ｂに格納されている。
【００６１】
上記穴かがりミシンＭの作用について説明する。布押え昇降機構１２と上糸切断機構１３と下糸切断機構１４を連動連結する連動連結機構５０と、この連動連結機構５０を介して、上記３つの機構１２〜１４を駆動するパルスモータ５１を設け、上糸切断機構１３の糸切り部材３０を、図１２と図１６の退避位置、図１３の切断位置、図１４の縫製開始位置、図１５の縫製中位置の４位置に位置切換えすることがきる。
【００６２】
パルスモータ５１により連動連結機構５０の連動板５６が略前後方向へ所定ストローク移動駆動され、その間に、布押え昇降機構１２と上糸切断機構１３と下糸切断機構１４が駆動され、特に、上糸切断機構１３においては、糸切り部材３０が、第１駆動系５７等を介して切断位置と縫製開始位置間の距離（退避位置と縫製中位置間の距離）だけ前後に移動し、第２駆動系５８等を介して切断位置と退避位置間の距離（縫製開始位置と縫製中位置間の距離）だけ左右に移動する。
【００６３】
糸切り部材３０が図１２の退避位置に位置しているとき、糸切り部材３０が上糸を保持した状態で、第２係合部３１ｄのうち段部３１ｅの前側部分と第２被係合部４６が係合している。この状態で、連動板５６が略後方限界位置に位置し、布押え昇降機構１２により布押え２２が上昇位置に保持されているため、作業者が加工布１をずらしたり取替えたりしてセットすることができる。
【００６４】
加工布１をセットした後に、フットペダル７２等の操作部材を操作して、パルスモータ５１を駆動し、連動連結機構５０の連動板５６を前方へ移動させる。連動板５６が略後方限界位置から前方限界位置へ移動する途中で、布押え２２が下降位置に下降して加工布１を送り部材２０に完全に押えることができる。尚、フットペダル７２の所定操作により、布押え２２により加工布１を押えた段階で一旦動作が停止するが、それ以降の動作を連続的に行うようにしてもよい。
【００６５】
連動板５６が略後方限界位置から前方限界位置へ移動する間、先ず、図１３に示すように、糸切り連結部材３１は前後方向に対しては停止した状態で、第２駆動系５８により第１，第２被係合部４５，４６が後方へ移動して、第２被係合部４６が第２係合部３１ｄの段部３１ｅと係合する。これにより、糸切り連結部材３１が右方へ押動され、糸切り部材３０が右方へ移動して切断位置に切換わる。
【００６６】
続いて、連動板５６が前方へ移動すると、図１４に示すように、第２駆動系５８により第１，第２被係合部４５，４６が後方へ移動すると共に、第１駆動系４７により糸切り連結部材３１も後方へ移動し、第２係合部３１ｄの段部３１ｅと第２被係合部４６の係合が解除され、第１係合部３３ｃと第１被係合部４５が係合して、糸切り部材３０が縫製開始位置に切換わる。
【００６７】
第２係合部３１ｄと第２被係合部４６が係合解除するとき、第１係合部３３ｃの左側に第１被係合部４５が位置するため、第１係合部３３ｃと第１被係合部４５は確実に係合する。尚、第２係合部３１ｄのうち段部３１ｅの前端側付近と第２被係合部４６が係合している状態では、布押え２２は既に下降位置に位置して加工布１を押えた状態になる。
【００６８】
糸切り部材３０が縫製開始位置に位置している状態から穴かがり縫目２の縫製が開始されるが、本案の場合、加工布１に次の穴かがり縫目２の縫製前にボタン穴形成機構１５によりボタン穴３を形成する為に、布押え２２により加工布１を押えた状態で、糸切り部材３０が上糸を保持して退避位置に切り換わる。
【００６９】
この場合、糸切り部材３０が図１４の縫製開始位置に位置している状態から、パルスモータ５１を逆方向へ駆動する。すると、連動板５６が後方へ移動するため、第１駆動系４７により糸切り連結部材３１が前方へ移動すると共に、第２駆動系５８により第１，第２被係合部４５，４６が前方へ移動し、第２係合部３１ｄと第２被係合部４６が係合し、第１係合部３３ｃと第１被係合部４５が係合解除して、先ず、糸切り部材３０が図１３の切断位置に切換わる。
【００７０】
続いて、連動板５６が前方へ移動すると、糸切り連結部材３１は前後方向に対しては停止した状態で、第２駆動系５８により第１，第２被係合部４５，４６が前方へ移動して、第２係合部３１ｄのうち段部３１ｅの前側部分と第２被係合部４６が係合し、糸切り部材３０が上糸を保持して図１２の退避位置に切換わる。
【００７１】
第２係合部３１ｄのうち段部３１ｅの前端側付近と第２被係合部４６が係合した状態で、パルスモータ５１の駆動を停止するため、前述のように、布押え２２により加工布１を押えた状態を保持できる。尚、段部３１ｅと第２被係合部４６が係合解除するとき、第１係合部３３ｃが第１被係合部４５の後側に位置するため、第１係合部３３ｃと第１被係合部４５が係合することはない。
【００７２】
その後、加工布１を布切断位置に布送りして位置決めしてから、ボタン穴形成機構１５を作動させ、布切断用カッター４８を１又は複数回下降して加工布１に落としてボタン穴３が形成される。その後、前述と同様に、糸切り部材３０を退避位置から切断位置を介して縫製開始位置に切換え、穴かがり縫目２の縫製に備える。
【００７３】
糸切り部材３０が上糸を保持して図１４の縫製開始位置に位置している状態で、連動連結機構５０を停止して縫製が行われる。ここで，布押え２２に連結されて布と一体的に布送り方向へ移動する送り腕２３は、糸切り連結部材３１の第１係合部３３ｃを押動可能な押動部７５を有し、穴かがり縫目２の縫製開始直後に、押動部７５が第１係合部３３ｃを押動して可動部材３３を前方へ移動させる。
【００７４】
すると、図１５に示すように、第１係合部３３ｃと第１被係合部４５との係合が解除され、引張りコイルバネ３８の付勢力により糸切り連動部材３１が左方へ移動し、第２係合部３１ｄと第２被係合部４６が係合して、糸切り部材３０が縫製中位置に切換わる。ところで、前述のように、刃開閉機構４０により、糸切り部材３０が１対の閉じた刃３０ａ，３０ｂを縫製開始位置又は縫製中位置で開けて上糸を開放するため、余分な上糸は穴かがり縫目２の内側へ縫い込まれる。
【００７５】
穴かがり縫目２の形成後、糸切り部材３０が図１５の縫製中位置に位置している状態から、連動板５６が後方へ移動すると、図１６に示すように、第２駆動系５８により第１，第２被係合部４５，４６が前方へ移動すると共に、第１駆動系４７により糸切り連結部材３１が前方へ移動して、糸切り部材３０が退避位置に切換えられる。
【００７６】
その後、連動板５６が後方へ移動して、図１３に示すように、糸切り連動部材３１は前後方向に対して停止した状態で、第２駆動系５８により第１，第２被係合部４５，４６が前方へ移動するため、第２係合部３１ｅと第２被係合部４６が係合して、糸切り部材３０が切断位置に切換わる。このとき、刃開閉機構４０により、糸切り部材３０が１対の開いた刃３０ａ，３０ｂを閉じて上糸を切断して保持する。
【００７７】
この際、連動連結機構５０を介して下糸切断機構１４が連動して下糸を切断し、更に、布押え昇降機構１２が連動して布押え２２が上昇して上昇位置に切換わり、この動作説明で最初に説明した元の状態になる。尚、穴かがり縫目２の形成途中又は形成後に、ボタン穴形成機構１５によりボタン穴を再度形成するように布切断用カッター４８を加工布１に落とすことができる。
【００７８】
このように、この穴かがりミシンＭによれば、加工布１に次の穴かがり縫目２の縫製前にボタン穴形成機構１５によりボタン穴３を形成する為に、上糸切断機構１３の糸切り部材３０が上糸を保持して退避位置に切り換わるので、ボタン穴形成機構１５の下降する布切断用カッター４８が糸切り部材３０と干渉することなく加工布１に落ちてボタン穴２を形成することができる。糸切り部材３０で上糸を保持した状態で、ボタン穴２を形成することができるため、布切断用カッター４８で上糸を切断したり、上糸が縫針１７から抜けたりする等虞もなく、その後行われる穴かがり縫目２の縫製に支障を来さない。
【００７９】
尚、縫製途中又は縫製後は、糸切り部材３０は図１５又は図１６に示す位置に存在するため、布切断用カッター４８の落下の邪魔にならない。また、縫製途中又は縫製後に布切断用カッター４８を落下させる場合には、既に加工布１にはボタン穴２が形成されているため、それ程強く布切断用ソレノイドアクチュエータ４９を駆動させる必要がなく、その駆動音を低減することができる。
【００８０】
穴かがり縫目２の縫製前だけでなく縫製途中又は縫製後に、再度ボタン穴３を形成するように布切断用カッター４８を加工布１に落とすことができ、これにより、縫製前に形成したボタン穴３を、穴かがり縫目２に縫い込まれた布のケバ等が塞いでも、そのケバを切断することができるため、綺麗に開放したボタン穴３を確実に形成することができる。
【００８１】
布押え昇降機構１２と上糸切断機構１３と下糸切断機構１４を連動連結機構５０により連結し、その連動連結機構５０を介して共通のパルスモータ５１で駆動するため、構造を簡単化し製作コストの低減を図ることが可能となる。布押え昇降機構１２の布押え２２により加工布１を押えた状態で、糸切り部材３０を退避位置に切り換えることができるため、加工布１を布切断用カッター４８に対応する位置に布送りして位置決めすることもでき、ボタン穴２を確実に形成できる。
【００８２】
尚、実施形態以外の種々の穴かがりミシンに本案を適用することが可能であるし、前記説明した以外に、本発明の趣旨を逸脱しない範囲で、種々の変更を付加した形態で実施することも可能である。例えば、連動連結機構を省略し、上糸切断機構を専用のアクチュエータにより駆動するようにしてもよい。
【００８３】
【発明の効果】
請求項１の穴かがりミシンによれば、布に次の穴かがり縫目の縫製前にボタン穴形成機構によりボタン穴を形成する為に、上糸切断機構の糸切り部材が上糸を保持して退避位置に切り換わるので、ボタン穴形成機構の下降する布切断用カッターが糸切り部材と干渉することなく布に落ちてボタン穴を形成することができる。糸切り部材で上糸を保持した状態で、ボタン穴を形成できるため、布切断用カッターで上糸を切断したり、上糸が縫針から抜けたりする等の虞もなく、その後行われる穴かがり縫目の縫製に支障を来さない。
【００８４】
布押え昇降機構と上糸切断機構とを連動連結機構により連結し、その連動連結機構を介して共通のアクチュエータで駆動するため、構造を簡単化し製作コストの低減を図ることが可能となる。布押え昇降機構の布押えにより布を押えた状態で、糸切り部材を退避位置に切り換えることができるため、布を布切断用カッターに対応する位置に布送りして位置決めすることもでき、ボタン穴を確実に形成することができる。
【００８５】
上糸切断機構により穴かがり縫目の縫製中に糸切り部材を待機させる縫製中位置に切換えることができるため、糸切り部材と昇降する縫針とを干渉させずに、穴かがり縫目の縫製を行うことができる。
糸切り連結部材の鉛直軸心回りの回動と布送り方向への移動を介して、糸切り部材を、切断位置、縫製開始位置、退避位置、縫製中位置に亙って切換えることができる。
第１係合部と第１被係合部が係合した状態で糸切り部材を縫製開始位置に保持し、第１係合部と第１被係合部が係合解除した状態で、付勢部材により糸切り部材を退避位置又は縫製中位置に切換えることができる。
穴かがり縫目の縫製開始直後、穴かがり縫目の縫製開始直後、布送り方向へ移動する送り腕の押動部が糸切り連結部材の第１係合部を押動し、第１係合部と第１被係合部との係合を解除して糸切り部材を縫製中位置に切換えることができる。
【００８６】
請求項２の穴かがりミシンによれば、刃開閉機構により、糸切り部材の１対の開いた刃が切断位置で閉じて上糸を確実に切断して保持でき、１対の閉じた刃が縫製開始位置又は縫製中位置で開いて上糸を確実に開放でき、余分な上糸を穴かがり縫目の内側に綺麗に縫い込むことができるため品質が向上する。
【００８７】
【００８８】
請求項３の穴かがりミシンによれば、第１駆動系により、連動連結部材の駆動力を糸切り連結部材に伝達して、糸切り連結部材を布送り方向へ確実に駆動することができる。
【００８９】
【００９０】
【００９１】
請求項４の穴かがりミシンによれば、第２係合部と第２被係合部とを係合させて、糸切り部材を退避位置と切断位置と縫製中位置に確実に切換えることができる。
【００９２】
請求項５の穴かがりミシンによれば、第１係合部に対して第２被係合部を布送り方向へ移動させ、第２係合部の段部と第２被係合部とを係合させて、糸切り連結部材を切断位置に移動させ切換えることができる。
【００９３】
請求項６の穴かがりミシンによれば、第２駆動系により第２被係合部を布送り方向へ駆動し、第２係合部に対する第２被係合部の係合位置を変化させて段部にも係合させることができる。
【００９４】
請求項７の穴かがりミシンによれば、アクチュエータとしてのパルスモータで駆動制御し、その駆動量に応じて、布押え昇降機構と上糸切断機構を適切なタイミングで駆動し、また、上糸切断機構において、糸切り部材の切断位置、退避位置、縫製開始位置、縫製中位置への切換えを確実に行うことができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る穴かがりミシンの側面からの透視図である。
【図２】穴かがりミシンの平面からの透視図である。
【図３】穴かがりミシンの正面からの透視図である。
【図４】加工布に形成された穴かがり縫目とボタン穴の平面図である。
【図５】穴かがりミシンの上糸切断機構等を含む要部平面図である。
【図６】穴かがりミシンの上糸切断機構等を含む要部側面図である。
【図７】糸切り部材と布押え等を含む要部平面図である。
【図８】糸切り部材と布押え等を含む要部側面図である。
【図９】糸切り部材と布押え等を含む要部正面図である。
【図１０】連動連結機構の一部とパルスモータの側面図である。
【図１１】穴かがりミシンの制御系のブロック図である。
【図１２】糸切り部材が上糸を保持した状態で退避位置に位置する糸切り機構等の平面図である。
【図１３】糸切り部材が切断位置に位置する糸切り機構等の平面図である。
【図１４】糸切り部材が縫製開始位置に位置する糸切り機構等の平面図である。
【図１５】糸切り部材が縫製中位置に位置する糸切り機構等の平面図である。
【図１６】糸切り部材が上糸を開放した状態で退避位置に位置する糸切り機構等の平面図である。
【符号の説明】
Ｍ穴かがりミシン
１加工布
２穴かがり縫目
３ボタン穴
１０縫目形成機構
１１布送り機構
１２布押え昇降機構
１３上糸切断機構
１４下糸切断機構
１５ボタン穴形成機構
１７縫針
２２布押え
２３送り腕
３０糸切り部材
３０ａ固定刃
３０ｂ可動刃
３１糸切り連結部材
３１ｄ第２係合部
３１ｅ段部
３３ｃ第１係合部
３８引っ張りコイルバネ
４０刃開閉機構
４５第１被係合部
４６第２被係合部
４８布切断用カッター
５０連動連結機構
５１パルスモータ
５６連動板
５７第１駆動系
５８第２駆動系
７５押動部[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a bobbin sewing machine, and more particularly to a boring machine in which a thread trimming member of an upper thread cutting mechanism can be switched over between a cutting position, a sewing start position, and a retracted position.
[0002]
[Prior art]
  Conventionally, a hole sewing machine is provided with a stitch formation mechanism, a cloth feed mechanism, a cloth presser lifting mechanism, a button hole formation mechanism, and the like. The cloth presser is lifted and lowered by the cloth presser lifting mechanism, and the cloth is fed integrally with the feed member and the presser foot by the cloth feed mechanism in a state where the cloth presser is pressed by the feed member of the cloth feed mechanism. A hole stitch is formed on the cloth by the stitch forming mechanism, and a button hole is formed inside the hole stitch by the button hole forming mechanism after or during the sewing of the hole stitch.
[0003]
  After forming the hole seam and button hole on the cloth, the cloth presser is lifted by the presser foot lifting mechanism to sew the next hole seam, and the cloth is shifted and replaced. Prior to this, the upper thread between the stitched seam and the sewing needle formed in the work cloth must be cut. Conventionally, an upper thread cutting mechanism for automatically performing this upper thread cutting after the formation of a hole stitch has been put to practical use.
[0004]
  The conventional upper thread cutting mechanism has a thread trimming member including a pair of blades, and the thread trimming member cuts an upper thread extending from the sewing needle at a cutting position in the vicinity of the sewing needle. However, since the thread trimming member located at this cutting position interferes with the raising and lowering needle and also with the lowering cutter of the button hole forming mechanism, the thread trimming member is cut before starting the sewing of the boring stitch. The position is switched from the retracted position.
[0005]
  Normally, when the thread trimming member moves from the retracted position to the cutting position, the pair of blades are mechanically closed to cut and hold the upper thread, and when the thread trimming member moves from the cutting position to the retracted position. When the upper thread that is mechanically opened and held by the pair of blades is released and the thread trimming member is located at the retracted position, the upper thread is always opened. The conventional upper thread cutting mechanism has a dedicated actuator and is driven independently of the other mechanisms.
[0006]
  Further, in the hole sewing machine disclosed in Japanese Patent Application Laid-Open No. 11-9860, the upper thread cutting mechanism includes a thread trimming member having a pair of blades, a thread trimming coupling member in which the thread trimming member is coupled to the tip, a swing arm, and a swing arm. A pulse motor that swings and drives the moving arm, a rotary shaft that operatively connects the thread trimming connecting member and the swinging arm, and a rolling joint. The thread trimming member has a cutting position, a retracted position, and a cutting position. Thus, the position can be switched to a sewing start position separated from the cloth feeding direction immediately after the start of sewing.
[0007]
  However, like the conventional upper thread cutting mechanism, when the thread trimming member is located at the retracted position, the upper thread is always opened. Sewing is started in a state where the thread trimming member cuts and holds the upper thread and is switched to the sewing start position. Immediately after that, the thread trimming member opens the pair of blades and releases the upper thread. By switching to the retracted position, the upper thread between the sewing needle and the thread trimming member can be tensioned appropriately and can be sewn into the inside of the hole stitch, thereby improving the quality. Further, the upper thread cutting mechanism also has a dedicated actuator (pulse motor) like the conventional one, and is driven independently of other mechanisms.
[0008]
  In this connection, the applicant of the present application disclosed in JP-A-11-156073 that the presser foot lifting / lowering mechanism, the upper thread cutting mechanism and the lower thread cutting mechanism are linked to each other, and a boring machine capable of driving these mechanisms with a common pulse motor is used. I have applied.
[0009]
[Problems to be solved by the invention]
  In a conventional hole sewing machine, the thread trimming member switches to the retracted position, releases the upper thread and sews the hole seam. After or during the sewing of the hole seam, the button hole forming mechanism Form. However, if the thread trimming member cannot hold the upper thread and cannot be switched to the retracted position, it is difficult to form the button hole without any problem before the sewing of the stitched seam.
[0010]
  That is, it is not impossible to form a button hole with the thread trimming member switched to the retracted position and the upper thread opened, but in such a case, the upper thread is cut by the cutter of the button hole forming mechanism, There is a possibility that inconveniences such as coming out of the sewing needle or protruding without being sewn neatly into the stitched seam where the excess upper thread is formed thereafter may occur. Of course, if the thread trimming member tries to form the button hole while holding the upper thread, the thread trimming member is located at the cutting position and interferes with the cutter of the button hole forming mechanism.
[0011]
  In addition, as described above, a conventional hole sewing machine cannot basically form a button hole before sewing a hole stitch, and forms a button hole after or during the sewing of a hole stitch. For this reason, there is a possibility that the hole stitches are cut when the button hole is formed by the cutter of the button hole forming mechanism.
[0012]
  Moreover, in the conventional boring machine, the upper thread cutting mechanism has a dedicated actuator and is driven independently of the other mechanisms. Therefore, each mechanism is provided with a dedicated actuator, and in some cases there are many sensors. Furthermore, there is a problem that a control device including a control program for driving and controlling these actuators is required, and the structure is complicated, resulting in high manufacturing costs.
[0013]
  In the upper thread cutting mechanism disclosed in JP-A-11-9860, the thread trimming member cannot hold the upper thread and switch to the retracted position, and further has a dedicated actuator and other mechanisms. Since it is driven independently, the same problem as the conventional upper thread cutting mechanism occurs.
[0014]
  As described above, the applicant of the present application has applied for a boring machine that interlocks the presser foot lifting mechanism, the upper thread cutting mechanism, and the lower thread cutting mechanism and can drive these mechanisms with a common pulse motor. However, a technique in which the thread trimming member of the upper thread cutting mechanism holds the upper thread and switches to the retracted position is not disclosed.
[0015]
  An object of the present invention is to form a button hole by a button hole forming mechanism before sewing a hole stitch, so that the thread trimming member of the upper thread cutting mechanism holds the upper thread and switches to the retracted position. In other words, the presser foot lifting mechanism and the upper thread cutting mechanism are linked and driven by a common pulse motor to simplify the structure and reduce the manufacturing cost.
[0016]
[Means for Solving the Problems]
  The bobbin sewing machine according to claim 1, wherein the bobbin sewing machine includes an upper thread cutting mechanism and a button hole forming mechanism, and includes an actuator for driving the upper thread cutting mechanism, and the upper thread cutting mechanism includes a boring stitch. Thread trimming member that cuts and holds the upper thread at the cutting position near the sewing needle after formingA thread trimmer connecting member that couples the thread trimmer member to the distal end portion and is pivotally supported so that the base end portion can rotate about the vertical axis and is movable in the cloth feed direction.The thread trimming member can be switched between the cutting position and the sewing start position in the vicinity of the movement locus of the cloth cutting cutter of the button hole forming mechanism and the retreat position retracted from the movement locus.In addition, it is possible to switch to the sewing position where the thread trimming member waits during the sewing of the hole stitch.The thread trimming member of the upper thread cutting mechanism holds the upper thread and switches to the retracted position so that the button hole is formed by the button hole forming mechanism before sewing the next boring stitch on the fabric. ConfigureA presser foot lifting mechanism, and an interlocking coupling mechanism that interlocks and links the presser foot lifting mechanism and the upper thread cutting mechanism, and the actuator presses the presser foot lifting mechanism and upper thread cutting mechanism via the interlocking coupling mechanism to A biasing member configured to be able to switch the thread trimming member of the upper thread cutting mechanism to the retracted position while pressing the cloth by the presser foot of the lifting mechanism, and biasing the thread trimming member to the retracted position or the sewing middle position side And a first engaged portion provided on the thread trimmer connecting member, and a first engaged portion engageable with the first engaged portion, the first engaged portion and the first engaged portion The thread trimming member is held at the sewing start position in the engaged state, and the thread trimming member is allowed to switch to the retracted position or the sewing middle position in the non-engaged state, and is connected to the cloth presser and integrated with the cloth. Pushing force capable of pushing the first engagement portion of the thread trimming connecting member to the feeding arm moving in the cloth feeding direction Immediately after the start of the sewing of the hole stitch, the first engaging portion and the first engaged portion are pushed by pushing the first engaging portion of the thread trimming connecting member located at the sewing start position. Disengage fromIt is characterized by this.
[0017]
  In this boring machine, an actuator for driving an upper thread cutting mechanism is provided, and the upper thread cutting mechanism has a thread trimming member that cuts and holds the upper thread at a cutting position in the vicinity of the sewing needle after forming the boring stitch. . The upper thread cutting mechanism switches the thread trimming member between the cutting position, the sewing start position near the movement locus of the cloth cutting cutter of the button hole forming mechanism, and the retreat position retracted from the movement locus.
[0018]
  In order to form the button hole by the button hole forming mechanism before sewing the next hole stitching on the cloth, the thread trimming member of the upper thread cutting mechanism holds the upper thread and switches to the retracted position. The cloth cutting cutter whose mechanism is lowered can fall on the cloth without interfering with the thread trimming member to form a button hole. Since the button hole can be formed with the upper thread held by the thread trimming member, there is no risk of the upper thread being cut by the cloth cutting cutter or the upper thread coming off the sewing needle. It does not interfere with the sewing of the pierced seams.
[0019]
[0020]
  Since the presser foot lifting mechanism and the upper thread cutting mechanism are connected by an interlocking connection mechanism and driven by a common actuator via the interlocking connection mechanism, the structure can be simplified and the manufacturing cost can be reduced. Since the thread trimming member can be switched to the retracted position while the cloth is being pressed by the presser foot of the presser foot lifting mechanism, the cloth can be fed to the position corresponding to the cloth cutting cutter and positioned. A hole can be formed reliably.
[0021]
  yarnIn a state in which the cutting member is switched to the sewing position and is in a standby state, it is possible to sew a bouncing seam without causing interference between the thread trimming member and the raising and lowering needle.
  The thread trimming member can be switched over the cutting position, the sewing start position, the retracted position, and the sewing middle position through the rotation of the thread trimming connecting member about the vertical axis and the movement in the cloth feeding direction.
  With the first engagement portion and the first engaged portion engaged, the thread trimmer member is held at the sewing start position, and the first engagement portion and the first engaged portion are disengaged. The thread trimming member can be switched to the retracted position or the sewing middle position by the biasing member.
  Immediately after the start of sewing the hole stitch, the pushing portion of the feeding arm moving in the cloth feeding direction pushes the first engaging portion of the thread trimming connecting member, and the first engaging portion and the first engaged portion are The thread trimming member can be switched to the sewing position by releasing the engagement.
[0022]
  Claim2The drilling machineIn the invention of claim 1,The thread trimming member has a pair of blades, and an upper thread cutting mechanism closes a pair of open blades at a cutting position and opens a pair of closed blades at a sewing start position or a sewing middle position. It is characterized by including. The blade opening / closing mechanism closes the pair of open blades of the thread trimming member at the cutting position and securely cuts and holds the upper thread, and the pair of closed blades opens at the sewing start position or the sewing middle position. The thread can be released reliably, and the extra upper thread can be neatly stitched inside the stitched seam, improving the quality.
[0023]
[0024]
  Claim3The boring machine of the claim1In the first aspect of the invention, the interlocking connection mechanism includes a interlocking connecting member driven by the actuator, and a driving force of the interlocking connecting member transmitted to the thread trimming connecting member to drive the thread trimming connecting member in the cloth feeding direction. A drive system is included. With this first drive system, the driving force of the interlocking connecting member can be transmitted to the thread trimming connecting member, and the thread trimming connecting member can be reliably driven in the cloth feed direction.
[0025]
[0026]
[0027]
  Claim4The boring machine of the claim1In this invention, it is provided with the 2nd engaging part provided in the said thread trimming connection member, and the 2nd to-be-engaged part engageable with the 2nd engaging part, These 2nd engaging parts and 2nd The thread trimming member is held at any one of a retracted position, a cutting position, and a sewing position while the engaged portion is engaged. By engaging the second engaging portion and the second engaged portion, the thread trimming member can be reliably switched to the retracted position, the cutting position, and the sewing position.
[0028]
  Claim5The boring machine of the claim4In the invention, the second engaging portion has a step portion, and when the step portion and the second engaged portion are engaged, the thread trimmer connecting member is switched to the cutting position. . The second engaged portion is moved in the cloth feeding direction with respect to the first engaging portion, the stepped portion of the second engaging portion is engaged with the second engaged portion, and the thread trimming connecting member is cut. It can be moved to a position and switched.
[0029]
  Claim6The boring machine of the claim5In the invention, the interlocking coupling mechanism includes a second drive system that transmits the driving force of the interlocking coupling member to the second engaged portion to drive the second engaged portion in the cloth feeding direction. It is what. By driving the second engaged portion in the cloth feeding direction by the second drive system, the engagement position of the second engaged portion with respect to the second engaging portion can be changed to be engaged with the stepped portion. .
[0030]
  Claim7The perforated sewing machine according to claim 1.4In any of the above, the actuator is a pulse motor. The pulse motor is driven and controlled, and the presser foot lifting mechanism and upper thread cutting mechanism are driven at appropriate timing according to the drive amount. In the upper thread cutting mechanism, the cutting position, retracted position, and sewing position of the thread trimming member Switching to the start position and the sewing position can be performed reliably.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is an example in which the present invention is applied to a boring machine that forms boring stitches 2 and button holes 3 on a work cloth 1, as shown in FIG. 1 and 2 will be described as front and rear and left and right.
[0032]
  As shown in FIGS. 1 to 3 and 11, the boring machine M has a bed portion 5, a pedestal portion 6, and an arm portion 7, and includes a stitch formation mechanism 10, a cloth feed mechanism 11, and a presser foot lifting mechanism. 12, an upper thread cutting mechanism 13, a lower thread cutting mechanism 14, and a button hole forming mechanism 15. The presser foot 22 is moved up and down by the presser foot lifting mechanism 12, and the work cloth 1 is pressed by the feed member 20 of the cloth feed mechanism 11 by the presser foot 22. In this state, the work cloth 1 is fed by the feed member 20. Then, it is fed in the front-rear direction integrally with the cloth presser 22, and the stitched seam 2 is formed on the work cloth 1 by the stitch forming mechanism 10.
[0033]
  The button hole 3 is formed inside the hole stitching line 2 by the button hole forming mechanism 15 before, during or after the sewing of the hole stitching line 2. When the boring stitch 2 and the button hole 3 are formed in the work cloth 1, the upper thread is cut by the upper thread cutting mechanism 13 and the lower thread is cut by the lower thread cutting mechanism 14, and then the presser foot lifting mechanism 12, the presser foot 22 is raised, and in this state, the work cloth 1 can be set by shifting or replacing it.
[0034]
  Hereinafter, each mechanism 10-15 is demonstrated. As shown in FIG. 3, the stitch formation mechanism 10 includes a needle bar 16, a sewing needle 17, a balance (not shown), a thread catcher (not shown) including a rotary hook, and the like. The needle bar 16 is driven up and down via an upper shaft 19 that is rotationally driven by a sewing machine motor 18 (see FIG. 11), and the upper thread supplied to the sewing needle 17 attached to the lower end of the needle bar 16 is fed by a thread catcher. The seam is formed by being caught and entangled with the lower thread.
[0035]
  Since the cloth feed mechanism 11 feeds the work cloth 1 only in the front-rear direction, the needle bar 16 and the sewing needle 17 are swung to the left and right, and the hole seam 2 (staggered seam and tack seam etc.) ) Can be sewn. A rotation operation member 18a is fixed to the rear end portion of the upper shaft 19 projecting to the rear side of the pedestal portion 6, and a drive pulley (not shown) driven by the rotation operation member 18a and the sewing machine motor 18. The timing belt 18 b is hooked on the upper surface of the upper shaft 19 and the driving force of the sewing machine motor 18 is transmitted to the upper shaft 19.
[0036]
  The cloth feed mechanism 11 is a long plate-shaped feed member 20 that is supported by the bed 5 so as to be movable in the front-rear direction, and a cloth feed motor 21 that feeds and drives the feed member 20 in the front-rear direction. 11). The presser foot 22FeedIt is connected to the front end portion of the arm 23 and presses the outer peripheral side portion of the work cloth 1 where the hole seam 2 is to be formed to the feed member 20 in a frame shape.
[0037]
  The feeding arm 23 is curved in an upwardly convex shape and is long in the front-rear direction, and its rear end portion reaches the vicinity of the pedestal column portion 6. A rear end portion of the feed arm 23 is connected to a movable body (not shown) connected to the feed member 20 so as to be rotatable around a left and right axis. As a result, the presser foot 22 moves back and forth integrally with the feed arm 23 and the feed member 20 and moves up and down integrally with the feed arm 23.
[0038]
  Now, in this perforating sewing machine M, the presser foot lifting mechanism 12, the upper thread cutting mechanism 13, and the lower thread cutting mechanism 14 are interlocked and connected, and the presser foot lifting mechanism 12 is connected via this interlocking connection mechanism 50. A pulse motor 51 is provided as a common actuator for driving the upper thread cutting mechanism 13 and the lower thread cutting mechanism 14. The interlocking connection mechanism 50 will be described in detail later.
[0039]
  The presser foot lifting mechanism 12 has a long connecting rod 25 in the vertical direction, and the lower end of the connecting rod 25 isFeedThe front end of the arm 23 is connected to the front end of the arm 23 so as to be relatively movable in the front-rear direction and not to be relatively movable in the vertical direction, and the connecting rod 25 is driven up and down via the interlocking connection mechanism 50.
[0040]
  1, 5, 7 to 9, the upper thread cutting mechanism 13 has a cutting position in the vicinity of the sewing needle 17 after the formation of the stitched seam 2 and the button hole 3 on the work cloth 1 (see FIG. 13). A thread trimming member 30 that cuts and holds the upper thread, and the thread trimming member 30 connected to the front end and pivotally pivotable about the vertical pivot shaft 32 (around the vertical axis) at the rear end. A thread trimming connecting member 31 is supported and supported so as to be movable in the cloth feeding direction (front-rear direction).
[0041]
  The upper thread cutting mechanism 13 is located on the opposite side (rear side) of the thread cutting member 30 to the cutting position and the cloth feeding direction (front) at the start of sewing with respect to the cutting position. The sewing start position near the movement locus of the cloth cutting cutter 48 (see FIG. 14), the retraction position located on the left side of the cutting position and retracted from the movement locus (see FIGS. 12 and 16), and the left side of the sewing start position. Further, it is configured to be switchable over four positions of the sewing position (see FIG. 15) that is located behind the cutting position and waits during the sewing of the hole stitching seam 2.
[0042]
  The thread trimming member 30 includes a pair of blades 30a and 30b (a fixed blade 30a and a movable blade 30b) and a thread holding spring 30c. The movable blade 30b is pivotally supported around the vertical axis so that the movable blade 30b can be opened and closed with respect to the fixed blade 30a. Has been. The upper thread cutting mechanism 13 includes a blade opening / closing mechanism 40 that closes a pair of open blades 30a and 30b at a cutting position and opens the pair of closed blades 30a and 30b at a sewing start position or a sewing middle position.
[0043]
  As shown in FIGS. 7 and 9, the blade opening / closing mechanism 40 has a driven portion 41 that is formed on the movable blade 30b and rises upward, and the movable portion 30b is opened by pushing the driven portion 41. The first pushing portion 42 and the second pushing portion 43 that pushes the pushed portion 41 and closes the movable blade 30b. The first and second pushing portions 42 and 43 areFeedThe arm 23 is fixedly provided, and these are relatively moved and engaged to open and close the pair of blades 30a and 30b.
[0044]
  In the rear end portion of the thread trimming connecting member 31, a pair of upper and lower elongated holes 31a are formed, and a pair of engaging members 34 are slidably engaged with the elongated holes 31a so as not to be detached. ing. The pair of upper and lower engaging members 34 are connected to the lower portion of the pivot shaft 32, and the upper portion of the pivot shaft 32 is rotatably supported by the sewing machine frame. As a result, the rear end portion of the thread trimming connecting member 31 is pivotally supported around the vertical axis so as to be movable in the front-rear direction.
[0045]
  As shown in FIG. 5 and FIG. 6, in addition to the pair of long holes 31 a, a rectangular long hole 31 b that is long in the front-rear direction is formed in the thread-trimming connecting member 31 in front of the center part in the front-rear direction. An arc hole 31c is formed between the elongated holes 31a and 31b, and a movable member 33 is provided at a substantially central portion in the front-rear direction of the thread trimming connecting member 31.
[0046]
  Most of the movable member 33 is disposed on the left side of the thread trimming coupling member 31, and two bolts fixed to the thread trimming coupling member 31 in a longitudinal hole 33 a formed in the movable member 33 in the front-rear direction. The shaft 34 is slidably engaged, and the movable member 33 is guided and supported so as to be movable back and forth with respect to the thread trimming connecting member 31. The movable member 33 has a driven portion 33b that bends to the right from the front end, and a first engagement portion 33c that bends to the left from the rear end.
[0047]
  The driven portion 33b passes through the elongated hole 31b and protrudes to the right side. The movable member 33 can move back and forth with respect to the thread trimming connecting member 31 by a stroke corresponding to the length of the elongated hole 31b. The first engaging portion 33c is connected to a spring mounting member 35 fixed to the thread trimmer connecting member 31 on the rear side by a tension coil spring 36, and the movable member 33 is urged rearward with respect to the thread trimmer connecting member 31. Yes.
[0048]
  A spring mounting member 37 extending rightward is fixed to an upper end on the front side of the center portion in the front-rear direction of the thread trimmer connecting member 31, and a right front end portion of the thread trimmer connecting member 31 is pulled by a tension coil spring 38 on the sewing machine frame on the left side of the thread trimmer connecting member 31. The thread trimming connecting member 31 is urged to rotate to the left about the pivot shaft 32. A plate-like overhanging portion that protrudes to the left as a whole is formed at the upper end portion of the thread trimming connecting member 31, and a second engagement portion 31d is formed at the front of the overhanging portion, and the second engagement portion 31d. Has a step portion 31e that protrudes leftward locally at the center portion in the front-rear direction.
[0049]
  Here, a plate-like first engaged portion 45 that can be engaged with the first engaging portion 33c, and the second engagement with the second linkage 66 of the second drive system 58 of the interlocking connecting mechanism 50. A second engaged portion 46 made of a roller engageable with the portion 31d is mounted.
[0050]
  When the first engagement portion 33c and the first engaged portion 45 are engaged, the thread trimming member 30 is held at the sewing start position, and when the first engagement portion 33c and the first engaged portion 45 are disengaged, the thread trimming member 30 is switched to the retracted position or the sewing position. Is acceptable. That is, the thread trimming member 30 is urged to the retracted position or the sewing middle position side by the tension coil spring 38, but the retracted position or the cutting is performed with the second engaging portion 31d and the second engaged portion 46 engaged. Held in position or during sewing.
[0051]
  As shown in FIGS. 7 and 8, the button hole forming mechanism 15 includes a cloth cutting cutter 48 and a solenoid actuator 49 (see FIG. 11) that drives the cloth cutting cutter 48 up and down. The button hole 3 is formed by dropping 48 on the work cloth 1. The cloth cutting cutter 48 is disposed at a position immediately behind the needle bar 16 and the sewing needle 17. When the thread trimming member 30 is located at the sewing start position and the cutting position, the cloth cutting cutter 48 interferes with the descending cloth cutting cutter 48. .
[0052]
  When the blade length of the cloth cutting cutter 48 is the same as the length of the button hole 3 to be formed, the cloth cutting cutter 48 is dropped once on the work cloth 1 to form the button hole 3, and the cloth cutting cutter 48 is formed. When the blade length is shorter than the length of the button hole 3 to be formed, the button hole 3 is formed by dropping the cloth cutting cutter 48 on the work cloth 1 a plurality of times.
[0053]
  Next, the interlocking connection mechanism 50 will be described. The interlocking connection mechanism 50 is a mechanism for interlockingly connecting the presser lifting / lowering mechanism 12, the upper thread cutting mechanism 13, and the lower thread cutting mechanism 14, and as shown in FIGS. 1 to 3 and 10, the lifting plate 52 and the vertical lever 53. , L-shaped links 54 and 55, an interlocking plate 56 (corresponding to an interlocking connecting member), first and second drive systems 57 and 58, and the like.
[0054]
  The pulse motor 51 is provided at a substantially central portion in the vertical direction of the columnar portion 6 in the left-right direction. The elevating plate 52 is guided by a pair of guide rods 52a so as to be movable up and down, and is fixed to the output shaft of the pulse motor 51. 51a meshes with a rack 52a formed at the lower end of the lifting plate 52 (see FIG. 10). The bifurcated portion 52 c of the elevating plate 52 is engaged with the engaging pin 53 a at the upper end portion of the vertical lever 53, and the vertical lever 53 is driven up and down together with the elevating plate 52 by the pulse motor 51.
[0055]
  The pair of L-shaped links 54 and 55 are symmetrically disposed on the front and rear of the arm portion 7, and are supported on the sewing machine frame so as to be rotatable about the left and right axial centers, respectively. The interlocking plate 56 is formed in a vertical plate shape that is long in the front and rear direction, and is disposed between a pair of L-shaped links 54 and 55, and both front and rear end portions thereof are freely rotatable at the upper ends of the L-shaped links 54 and 55. It is connected to.
[0056]
  The upper end portion of the vertical lever 53 is rotatably connected to the rear end portion of the L-shaped link 54, and the connecting rod 25 of the presser foot lifting mechanism 12 is connected to the front end portion of the L-shaped link 55. When the vertical lever 53 is moved up and down, the L-shaped links 54 and 55 are rotated, and the interlocking plate 56 is driven in the front-rear direction while moving up and down slightly. When the interlocking plate 56 moves forward, the presser foot 22 is lowered, and when the interlocking plate 56 moves rearward, the presser foot 22 is raised.
[0057]
  The first drive system 57 transmits the driving force of the interlocking plate 56 to the thread trimming coupling member 31 to drive the thread trimming coupling member 31 in the front-rear direction. The first drive system 57 includes a link member 60 pivotally supported around the left and right axis of the sewing machine frame, and a first linkage 61 whose upper end portion is fixedly connected to the link member 60. The engaging pin 60 a at the tip of the engaging portion engages with a curved first guide hole 56 a formed in the interlocking plate 56, and the engaging pin 61 a at the lower end portion of the first linkage 61 is an arc of the thread trimmer connecting member 31. It is engaged with the hole 31c.
[0058]
  The second drive system 58 transmits the driving force of the interlocking plate 56 to the first and second engaged portions 45 and 46 to drive the first and second engaged portions 45 and 46 in the substantially front-rear direction. The second drive system 58 includes a link member 65 pivotally supported around the left and right axis on the sewing machine frame, and a second linkage 66 having an upper end fixedly connected to the link member 65. The engaging pin 65 a at the tip of the engaging portion engages with the curved second guide hole 56 b formed in the interlocking plate 56, and the first and second engaged portions 45, 46 are formed at the lower end portion of the second linkage 66. Is provided.
[0059]
  Although not shown, the lower thread cutting mechanism 14 is connected to the lower end portion of the vertical lever 53. As the lower thread cutting mechanism 14, for example, an equivalent to the lower thread cutting mechanism (for example, the lower thread cutting mechanism of Japanese Patent Application Laid-Open No. 11-156073) filed by the applicant of the present application may be applied. .
[0060]
  Here, a control system including the control device 70 of the boring machine M will be briefly described based on the block diagram of FIG. The control device 70 includes a CPU 70a, a ROM 70b, a RAM 70c, and an input / output interface 70d, and these 70a to 70d are connected to each other by a bus 70e. Drive circuits 71a to 71c for the motors 18, 21, 51, a drive circuit 71d for the solenoid actuator 49, and a foot pedal 72 are connected to the input / output interface 70d. The ROM 70b stores a control program for driving and controlling the motors 18, 21, 51 and the solenoid actuator 49 to achieve the operation described below.
[0061]
  The operation of the above-described hole sewing machine M will be described. An interlocking connection mechanism 50 for interlockingly connecting the presser foot lifting mechanism 12, the upper thread cutting mechanism 13, and the lower thread cutting mechanism 14, and a pulse motor 51 for driving the three mechanisms 12 to 14 via the interlocking connection mechanism 50. The thread cutting member 30 of the upper thread cutting mechanism 13 is switched to the four positions of the retracted position in FIGS. 12 and 16, the cutting position in FIG. 13, the sewing start position in FIG. 14, and the sewing middle position in FIG. I'm going.
[0062]
  The interlocking plate 56 of the interlocking connection mechanism 50 is driven to move by a predetermined stroke substantially in the front-rear direction by the pulse motor 51, and the presser foot lifting / lowering mechanism 12, the upper thread cutting mechanism 13 and the lower thread cutting mechanism 14 are driven in the meantime. In the thread cutting mechanism 13, the thread cutting member 30 moves back and forth by a distance between the cutting position and the sewing start position (distance between the retracted position and the sewing middle position) via the first drive system 57 and the like. The distance between the cutting position and the retracted position (the distance between the sewing start position and the sewing middle position) is moved to the left and right via the drive system 58 and the like.
[0063]
  When the thread trimming member 30 is located at the retracted position in FIG. 12, the front portion of the step portion 31e and the second engaged portion of the second engagement portion 31d are held in a state where the thread trimming member 30 holds the upper thread. Part 46 is engaged. In this state, the interlocking plate 56 is positioned at the substantially rear limit position, and the presser foot 22 is held at the lifted position by the presser foot lifting mechanism 12, so that the operator sets the work cloth 1 by shifting or replacing it. be able to.
[0064]
  After the work cloth 1 is set, the operation member such as the foot pedal 72 is operated to drive the pulse motor 51 and move the interlocking plate 56 of the interlocking coupling mechanism 50 forward. While the interlocking plate 56 moves from the substantially rear limit position to the front limit position, the cloth presser 22 can be lowered to the lowered position and the work cloth 1 can be completely pressed against the feed member 20. The operation is temporarily stopped when the work cloth 1 is pressed by the presser foot 22 by a predetermined operation of the foot pedal 72, but the subsequent operation may be continuously performed.
[0065]
  While the interlocking plate 56 moves from the substantially rear limit position to the front limit position, first, as shown in FIG. 13, the second drive system 58 causes the thread trimming connecting member 31 to stop in the front-rear direction. 1 and 2nd to-be-engaged parts 45 and 46 move back, and the 2nd to-be-engaged part 46 engages with the step part 31e of the 2nd engaging part 31d. As a result, the thread trimming connecting member 31 is pushed rightward, and the thread trimming member 30 moves rightward and switches to the cutting position.
[0066]
  Subsequently, when the interlocking plate 56 moves forward, the first and second engaged portions 45 and 46 are moved rearward by the second drive system 58 and the first drive system 47 as shown in FIG. The thread trimming connecting member 31 also moves rearward, the engagement between the stepped portion 31e of the second engaging portion 31d and the second engaged portion 46 is released, and the first engaging portion 33c and the first engaged portion 45 are released. Are engaged, and the thread trimming member 30 is switched to the sewing start position.
[0067]
  When the second engaged portion 31d and the second engaged portion 46 are disengaged, the first engaged portion 45 is positioned on the left side of the first engaged portion 33c. 1 The engaged portion 45 is securely engaged. In the state where the second engagement portion 31d is engaged with the vicinity of the front end side of the step portion 31e and the second engaged portion 46, the cloth presser 22 is already positioned at the lowered position and presses the work cloth 1. It becomes a state.
[0068]
  The sewing of the hole stitch 2 is started from the state in which the thread trimming member 30 is located at the sewing start position. In this case, the button hole is formed on the work cloth 1 before the sewing of the next hole stitch 2. In order to form the button hole 3 by the mechanism 15, the thread trimming member 30 holds the upper thread and switches to the retracted position while the work cloth 1 is pressed by the cloth presser 22.
[0069]
  In this case, the pulse motor 51 is driven in the reverse direction from the state where the thread trimming member 30 is located at the sewing start position in FIG. Then, since the interlocking plate 56 moves rearward, the thread cutting connecting member 31 moves forward by the first drive system 47, and the first and second engaged portions 45, 46 move forward by the second drive system 58. First, the second engaging portion 31d and the second engaged portion 46 are engaged, and the first engaging portion 33c and the first engaged portion 45 are disengaged. Is switched to the cutting position of FIG.
[0070]
  Subsequently, when the interlocking plate 56 moves forward, the first and second engaged portions 45 and 46 are moved forward by the second drive system 58 while the thread trimmer connecting member 31 is stopped in the front-rear direction. The second engagement portion 31d is engaged with the front portion of the step portion 31e and the second engaged portion 46, and the thread trimming member 30 holds the upper thread and switches to the retracted position in FIG. .
[0071]
  In the state where the vicinity of the front end side of the stepped portion 31e and the second engaged portion 46 are engaged with each other in the second engaging portion 31d, the driving of the pulse motor 51 is stopped. The state where the cloth 1 is pressed can be held. When the stepped portion 31e and the second engaged portion 46 are disengaged, the first engaging portion 33c and the second engaged portion 46 are located on the rear side of the first engaged portion 45. 1 The engaged portion 45 is not engaged.
[0072]
  Thereafter, the work cloth 1 is fed to the cloth cutting position and positioned, and then the button hole forming mechanism 15 is operated, and the cloth cutting cutter 48 is lowered one or more times to drop on the work cloth 1 and the button hole 3. Is formed. Thereafter, in the same manner as described above, the thread trimming member 30 is switched from the retracted position to the sewing start position via the cutting position to prepare for the sewing of the boring stitch 2.
[0073]
  In a state where the thread trimming member 30 holds the upper thread and is positioned at the sewing start position in FIG. 14, the interlocking coupling mechanism 50 is stopped and sewing is performed. Here, the feed arm 23 that is connected to the fabric presser 22 and moves integrally with the fabric in the fabric feed direction has a pushing portion 75 that can push the first engaging portion 33c of the thread trimming coupling member 31. Immediately after the start of sewing the hole stitching seam 2, the pushing portion 75 pushes the first engaging portion 33c to move the movable member 33 forward.
[0074]
  Then, as shown in FIG. 15, the engagement between the first engaging portion 33 c and the first engaged portion 45 is released, and the thread trimming interlocking member 31 moves to the left by the biasing force of the tension coil spring 38. The second engaging portion 31d and the second engaged portion 46 are engaged, and the thread trimming member 30 is switched to the sewing position. By the way, as described above, the blade opening / closing mechanism 40 causes the thread trimming member 30 to open the pair of closed blades 30a and 30b at the sewing start position or the middle sewing position to release the upper thread. It is sewed into the inside of the hole seam 2.
[0075]
  When the interlocking plate 56 moves rearward from the state in which the thread trimming member 30 is located at the sewing middle position in FIG. 15 after the formation of the stitched seam 2, as shown in FIG. While the first and second engaged parts 45 and 46 move forward, the first drive system 47 moves the thread trimmer connecting member 31 forward, and the thread trimmer member 30 is switched to the retracted position.
[0076]
  Thereafter, the interlocking plate 56 moves rearward and, as shown in FIG. 13, the first and second engaged parts are driven by the second drive system 58 in a state where the thread trimming interlocking member 31 is stopped in the front-rear direction. Since 45 and 46 move forward, the 2nd engaging part 31e and the 2nd to-be-engaged part 46 engage, and the thread trimming member 30 switches to a cutting position. At this time, by the blade opening / closing mechanism 40, the thread trimming member 30 closes the pair of open blades 30a and 30b and cuts and holds the upper thread.
[0077]
  At this time, the lower thread cutting mechanism 14 interlocks and cuts the lower thread via the interlocking connection mechanism 50, and further, the presser foot lifting mechanism 12 interlocks and the presser foot 22 rises and switches to the raised position. The original state described first in the operation description is obtained. Note that the cloth cutting cutter 48 can be dropped onto the work cloth 1 so that the button hole is formed again by the button hole forming mechanism 15 during or after the formation of the hole stitching seam 2.
[0078]
  As described above, according to the hole sewing machine M, the thread of the upper thread cutting mechanism 13 is formed in order to form the button hole 3 by the button hole forming mechanism 15 before sewing the next hole stitch 2 on the work cloth 1. Since the cutting member 30 holds the upper thread and switches to the retracted position, the cloth cutting cutter 48 that the button hole forming mechanism 15 descends falls onto the work cloth 1 without interfering with the thread cutting member 30 and causes the button hole 2 to move. Can be formed. Since the button hole 2 can be formed while the upper thread is held by the thread trimming member 30, there is no fear that the upper thread is cut by the cloth cutting cutter 48 or the upper thread is pulled out from the sewing needle 17. Then, there will be no hindrance to the sewing of the hole seam 2 performed thereafter.
[0079]
  During or after sewing, the thread trimming member 30 is present at the position shown in FIG. 15 or FIG. 16, and therefore does not interfere with the drop of the cloth cutting cutter 48. Further, when the cloth cutting cutter 48 is dropped during or after sewing, since the button hole 2 is already formed in the work cloth 1, it is not necessary to drive the cloth cutting solenoid actuator 49 so strongly. The driving sound can be reduced.
[0080]
  The cloth cutting cutter 48 can be dropped on the work cloth 1 so as to form the button hole 3 again during or after the sewing as well as before the sewing of the hole stitching seam 2, and thus the button formed before the sewing. Even if the hole 3 is closed by a cloth or the like sewn into the stitched seam 2, the hole can be cut, so that the button hole 3 can be reliably formed.
[0081]
  Since the presser foot lifting mechanism 12, the upper thread cutting mechanism 13, and the lower thread cutting mechanism 14 are connected by an interlocking connection mechanism 50 and driven by the common pulse motor 51 via the interlocking connection mechanism 50, the structure is simplified and the manufacturing cost is reduced. Can be reduced. Since the thread trimming member 30 can be switched to the retracted position while the work cloth 1 is pressed by the work clamp 22 of the work clamp lifting mechanism 12, the work cloth 1 is fed to a position corresponding to the cloth cutting cutter 48. The button hole 2 can be reliably formed.
[0082]
  It should be noted that the present invention can be applied to various types of hole sewing machines other than the embodiment, and in addition to the above description, various modifications are added without departing from the spirit of the present invention. Is also possible. For example, the interlocking connection mechanism may be omitted, and the upper thread cutting mechanism may be driven by a dedicated actuator.
[0083]
【The invention's effect】
  According to the bobbin sewing machine of claim 1, the thread trimmer member of the upper thread cutting mechanism holds the upper thread in order to form the button hole by the button hole forming mechanism before sewing the next boring stitch on the cloth. Therefore, the cloth cutting cutter descending by the button hole forming mechanism can fall on the cloth and form a button hole without interfering with the thread trimming member. Since the button hole can be formed while the upper thread is held by the thread trimming member, there is no risk that the upper thread will be cut by the cloth cutting cutter or the upper thread will come off the sewing needle. Does not interfere with the stitching of the seams.
[0084]
  clothSince the presser lifting mechanism and the upper thread cutting mechanism are connected by an interlocking connection mechanism and driven by a common actuator via the interlocking connection mechanism, the structure can be simplified and the manufacturing cost can be reduced. Since the thread trimming member can be switched to the retracted position while the cloth is being pressed by the presser foot of the presser foot lifting mechanism, the cloth can be fed to the position corresponding to the cloth cutting cutter and positioned. A hole can be formed reliably.
[0085]
  UpSince the thread cutting mechanism can be switched to the sewing middle position where the thread trimming member waits during the sewing of the hole stitches, the thread stitches are sewn without causing interference between the thread trimming member and the raising and lowering needle. be able to.
  The thread trimming member can be switched over the cutting position, the sewing start position, the retracted position, and the sewing middle position through the rotation of the thread trimming connecting member about the vertical axis and the movement in the cloth feeding direction.
  With the first engagement portion and the first engaged portion engaged, the thread trimmer member is held at the sewing start position, and the first engagement portion and the first engaged portion are disengaged. The thread trimming member can be switched to the retracted position or the sewing middle position by the biasing member.
  Immediately after the start of sewing of the hoisting seam, immediately after the start of sewing of the hoisting seam, the pushing portion of the feed arm moving in the cloth feeding direction pushes the first engaging portion of the thread trimming connecting member, and the first engagement The thread trimming member can be switched to the sewing position by releasing the engagement between the portion and the first engaged portion.
[0086]
  Claim2According to the boring machine, the pair of open blades of the thread trimming member is closed at the cutting position and the upper thread can be securely cut and held by the blade opening / closing mechanism, and the pair of closed blades can be held at the sewing start position. Alternatively, the upper thread can be reliably opened by opening at the sewing middle position, and the extra upper thread can be neatly stitched inside the stitched seam, improving the quality.
[0087]
[0088]
  Claim3According to this hole sewing machine, the driving force of the interlocking connecting member can be transmitted to the thread trimmer connecting member by the first drive system, and the thread trimmer connecting member can be reliably driven in the cloth feed direction.
[0089]
[0090]
[0091]
  Claim4According to the hole sewing machine, the thread engagement member can be reliably switched to the retracted position, the cutting position, and the sewing position by engaging the second engaging portion and the second engaged portion.
[0092]
  Claim5According to the drilling machine, the second engaged portion is moved in the cloth feeding direction with respect to the first engaging portion, and the stepped portion of the second engaging portion and the second engaged portion are engaged. Thus, the thread trimming connecting member can be moved and switched to the cutting position.
[0093]
  Claim6According to the hole sewing machine, the second engaged portion is driven in the cloth feeding direction by the second drive system, and the engagement position of the second engaged portion with respect to the second engaging portion is changed to change to the stepped portion. Can also be engaged.
[0094]
  Claim7According to the drilling machine, as an actuatorofPulse motorsoIn accordance with the drive amount, the presser foot lifting mechanism and the upper thread cutting mechanism are driven at an appropriate timing.In the upper thread cutting mechanism, the cutting position of the thread trimming member, the retracted position, the sewing start position, Switching to the sewing middle position can be performed reliably.
[Brief description of the drawings]
FIG. 1 is a perspective view from the side of a drilling machine according to an embodiment of the present invention.
FIG. 2 is a perspective view from the plane of a hole sewing machine.
FIG. 3 is a perspective view from the front of a hole sewing machine.
FIG. 4 is a plan view of a hole stitch and a button hole formed in a work cloth.
FIG. 5 is a plan view of a main part including an upper thread cutting mechanism and the like of a boring machine.
FIG. 6 is a side view of an essential part including an upper thread cutting mechanism and the like of a boring machine.
FIG. 7 is a plan view of a main part including a thread trimming member and a cloth presser.
FIG. 8 is a side view of a main part including a thread trimming member and a cloth presser.
FIG. 9 is a front view of a main part including a thread trimming member and a cloth presser.
FIG. 10 is a side view of a part of the interlocking coupling mechanism and a pulse motor.
FIG. 11 is a block diagram of a control system for a boring machine.
FIG. 12 is a plan view of a thread trimming mechanism and the like positioned at a retracted position with the thread trimming member holding the upper thread.
FIG. 13 is a plan view of a thread trimming mechanism and the like in which a thread trimming member is located at a cutting position.
FIG. 14 is a plan view of a thread trimming mechanism and the like in which a thread trimming member is located at a sewing start position.
FIG. 15 is a plan view of a thread trimming mechanism and the like in which a thread trimming member is located at a sewing middle position.
FIG. 16 is a plan view of a thread trimming mechanism and the like positioned at a retracted position with the thread trimming member releasing the upper thread.
[Explanation of symbols]
M drilling machine
1 Processing cloth
2 Hole stitching
3 Button hole
10 Stitch formation mechanism
11 Cloth feed mechanism
12 Work clamp lifting mechanism
13 Upper thread cutting mechanism
14 Lower thread cutting mechanism
15 Button hole formation mechanism
17 Sewing needle
22 Work clamp
23 Feeding arm
30 Thread trimming member
30a Fixed blade
30b Movable blade
31 Thread trimming coupling member
31d 2nd engaging part
31e Step
33c 1st engaging part
38 Tensile coil spring
40 Blade opening / closing mechanism
45 First engaged portion
46 Second engaged portion
48 Cutter for cloth cutting
50 Linkage mechanism
51 pulse motor
56 Interlocking plate
57 First drive system
58 Second drive system
75 Pushing part

Claims

In a boring machine equipped with an upper thread cutting mechanism and a button hole forming mechanism,
An actuator for driving the upper thread cutting mechanism;
The upper thread cutting mechanism includes a thread trimming member that cuts and holds the upper thread at a cutting position in the vicinity of the sewing needle after the formation of the boring stitch, and connects the thread trimming member to a distal end portion and a base end portion of the vertical shaft. A thread trimmer connecting member pivotally supported around the center and movable in the cloth feeding direction, and the thread trimmer member is arranged near the movement position of the cutting position and the cloth cutting cutter of the button hole forming mechanism. It is possible to switch between the sewing start position and the retracted position retracted from the movement trajectory, and to be able to switch to the sewing position where the thread trimming member waits during the sewing of the boring stitch ,
In order to form the button hole by the button hole forming mechanism before sewing the next hole stitch on the cloth, the thread trimming member of the upper thread cutting mechanism is configured to hold the upper thread and switch to the retracted position.
A presser foot lifting mechanism and an interlocking connection mechanism for interlockingly connecting the presser foot lifting mechanism and the upper thread cutting mechanism;
The actuator presses the presser foot lifting mechanism and upper thread cutting mechanism via the interlocking connection mechanism, and switches the thread trimmer member of the upper thread cutting mechanism to the retracted position while pressing the fabric with the presser foot of the presser foot lifting mechanism. Configure as possible
A biasing member that biases the thread trimming member toward the retracted position or the middle sewing position, a first engagement portion provided on the thread trimming connection member, and a first cover that can be engaged with the first engagement portion. An engagement portion,
When the first engagement portion and the first engaged portion are engaged, the thread trimming member is held at the sewing start position, and the thread trimming member is allowed to be switched to the retracted position or the sewing position in the disengaged state.
A feed arm that is connected to the cloth presser and moves in the cloth feed direction integrally with the cloth is provided with a pressing portion capable of pressing the first engagement portion of the thread trimming connecting member,
Immediately after the start of sewing of the hole stitch, the pushing portion pushes the first engaging portion of the thread trimmer connecting member located at the sewing start position, thereby engaging the first engaging portion and the first engaged portion. A boring machine characterized by releasing the connection.

The thread trimming member has a pair of blades, and the upper thread cutting mechanism closes a pair of open blades at a cutting position and opens a pair of closed blades at a sewing start position or a sewing middle position. The boring machine according to claim 1, comprising:

The interlocking connection mechanism includes an interlocking connection member driven by the actuator and a first drive system that transmits a driving force of the interlocking connection member to the thread trimming connection member to drive the thread trimming connection member in the cloth feeding direction. The boring machine according to claim 1, wherein:

A second engaging portion provided on the thread trimmer connecting member; and a second engaged portion that can be engaged with the second engaging portion.
The thread trimming member is held at any one of a retracted position, a cutting position, and a sewing position while the second engaging portion and the second engaged portion are engaged. The drilling machine described.

The hole according to claim 4, wherein the second engaging portion has a step portion, and when the step portion and the second engaged portion are engaged, the thread trimming connecting member is switched to the cutting position. Overlock sewing machine.

The said interlocking connection mechanism contains the 2nd drive system which transmits the driving force of the said interlocking connection member to a 2nd to-be-engaged part, and drives a 2nd to-be-engaged part to a cloth feed direction. The boring machine according to 5.

The boring machine according to any one of claims 1 to 4, wherein the actuator is a pulse motor.