JP3822107B2

JP3822107B2 - Looper drive unit

Info

Publication number: JP3822107B2
Application number: JP2002001036A
Authority: JP
Inventors: 孝則石川
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2002-01-08
Filing date: 2002-01-08
Publication date: 2006-09-13
Anticipated expiration: 2022-01-08
Also published as: JP2003199987A

Description

【０００１】
【発明の属する技術分野】
本発明は、二重環縫いミシンや偏平縫いミシン等に装備されるルーパに、長円軌道の運動を付与するルーパ駆動装置に関するもので、詳しくは、ルーパの運動軌道の調整操作を容易にするための改良に関するものである。
【０００２】
【従来の技術】
二重環縫いミシンや偏平縫いミシンのルーパは、布地の送り面となる針板の下側において、針落ち位置の後ろ側に沿う進出動作と針落ち位置の前側に沿う退入動作とを針の上下動に同期して行い、進出時に常道する針の後ろ側に形成された針糸のループを捉えて引き出し、また、退入時に自身の後ろ側に残したルーパ糸を下動する針により捉えさせて、布地の裏面に針糸とルーパ糸とが他糸ルーピングされた縫い目を形成する作用を成すものである。このようなルーパの運動軌道は、針の上下動方向および布送り方向のそれぞれに直交する軸線方向に長軸を持つ長円軌道となる。
【０００３】
図５および図６は、このようなルーパの長円軌道の運動を実現するルーパ駆動装置の従来例を示したものである。ここに示したルーパ駆動装置１００は、ミシンの針の上下動方向および布送り方向のそれぞれと略直交して配置されるルーパ棒６と、このルーパ棒６の先端に軸線を外して装備されたルーパ９と、ミシンの下軸１の回転をルーパ棒６の軸線方向の往復運動に変換する水平駆動機構７１と、下軸１の回転をルーパ棒６の軸線回りの往復回動運動に変換する前後駆動機構７２とを備えている。
【０００４】
水平駆動機構７１は、ルーパ棒６に嵌合固定される一対のホルダー７，８と、一方のホルダー７に調整ねじ１６により固定されるスライダ１３と、このスライダ１３の嵌合するガイド孔１２ａがルーパ棒６の軸線方向に沿って設けられて、スライダ１３を介してルーパ棒６を軸線方向に摺動自在に支持するルーパ棒ガイド１２と、上端が下軸１の端部のクランク部１ａに取り付けられて下軸１の回転によって上下動するルーパロッド２と、下軸１と直交する水平面内で回転自在にミシンフレームに支承されたルーパ軸４と、このルーパ軸４とルーパロッド２の先端とを連結してルーパロッド２の上下動をルーパ軸４の軸線回りの往復回動運動に変換するルーパ腕３と、基端がルーパ軸４に嵌合固定されるとともに先端５ａが一対のホルダー７，８に挾持され、ルーパ軸４の往復回動運動によって先端５ａがルーパ棒６の軸線方向に沿って揺動する揺動腕５とを備えて、揺動腕５の揺動運動によってルーパ棒６に軸線方向の往復運動を付与する。
【０００５】
ガイド孔１２ａおよびスライダ１３の摺動面に摩耗が生じても、摺動面間の隙間の調整により安定したガイド性能を維持できるように、ルーパ棒ガイド１２およびスライダ１３の摺動面は、テーパ面に設定されている。また、調整ねじ１６は、スライダ１３の取付位置を上下方向に移動調整することで、ガイド孔１２ａの摺動面とスライダ１３の摺動面との間の隙間を調整可能にしている。
【０００６】
前後駆動機構７２は、支持板１９を挿通した下軸１の端部に嵌合固定された偏心輪１０と、この偏心輪１０と支持板１９とによって揺動可能に挟まれて配されるとともに先端部１１ａが偏心輪１０の回転に連動してミシンの前後方向に揺動する前後ロッド１１と、ルーパ棒ガイド１２の一側に突設された前後動用アーム１８と、前後ロッド１１の先端部１１ａと前後動用アーム１８とをねじ部材により連結する連結手段１５とを備えて、前後ロッド１１から前後動用アーム１８に伝達する押し引き力でルーパ棒ガイド１２とルーパ棒６とを一体にルーパ棒６の軸線回りに回動させることで、ルーパ棒６に軸線回りの往復回動運動を付与する。
【０００７】
この従来例の場合、連結手段１５は、ルーパ側から前後動用アーム１８および前後ロッド１１に挿通されるねじ部材１５ａと、前後ロッド１１から突出したねじ部材１５ａの先端に螺合するナット１５ｂとの締結によって、前後ロッド１１と前後動用アーム１８とを連結する。
【０００８】
なお、前後動用アーム１８に貫通形成されたねじ部材１５ａ挿通用の挿通孔１８ａは、ルーパ棒６の回動範囲の修正や調整のために、前後ロッド１１と前後動用アーム１８との間の連結位置をずらすことが可能なように、連結位置調整方向に沿って長い長孔に設定している。
【０００９】
以上のルーパ駆動装置１００は、水平駆動機構７１および前後駆動機構７２のそれぞれがルーパ棒６に付与する運動の合成によって、ルーパ９の針落ち位置Ａの周囲を回る長円軌道Ｂの運動を実現する。
【００１０】
【発明が解決しようとする課題】
ところで、高品位な縫い目の形成には、ルーパ９の運動軌道を適正位置に調整することが必要不可欠である。そして、ルーパ９の運動軌道の適正位置への調整には、スライダ１３とガイド孔１２ａとの間の摺動面相互の隙間の大きさを適正に調整すること、また、前後ロッド１１と前後動用アーム１８との連結位置を適正に調整することが必要で、摺動部の摩耗等に応じて、これらの調整作業を繰り返すことになる。
【００１１】
ところが、従来の場合、図示のように、調整ねじ１６が連結手段１５の連結手段１５ｂの頭部に隠れた位置にあるため、調整ねじ１６を操作し難く、スライダ１３とガイド孔１２ａとの間の摺動面相互の隙間調整が簡単にできないという問題があった。
【００１２】
また、前後ロッド１１と前後動用アーム１８との連結位置の調整を行うために、連結手段１５を操作する場合には、ねじ部材１５ａおよびナット１５ｂの双方を工具で掴まないと、連結手段１５による締結を緩めたり再締め付けすることができず、ねじ部材１５ａおよびナット１５ｂの双方を掴むために両手が塞がってしまい、作業が行い難いという問題もあった。更に、反ルーパ側からナット１５ｂに工具を装着する際、工具が支持板１９の縁に干渉して、工具の操作が行い難くなる虞れもあった。
【００１３】
本発明は、前述した問題点に鑑みてなされたものであり、その目的は、ルーパの運動軌道の調整が容易にできて、ルーパの運動軌道の安定による高品位な縫い目の維持が容易なルーパ駆動装置を提供することにある。
【００１４】
【課題を解決するための手段】
上記目的を達成するために、本発明に係るルーパ駆動装置は、請求項１に記載したように、先端にルーパが装着され、布送り方向と直交する方向に対して配置されるルーパ棒と、下軸の回転を前記ルーパ棒の軸線方向の運動に変換する水平駆動機構と、下軸の回転を前記ルーパ棒の軸線回りの運動に変換する前後駆動機構と、を備え、前記水平駆動機構と前後駆動機構とにより、前記ルーパに長円運動を付与するルーパ駆動装置であって、前記前後駆動機構は、下軸の回転に伴い前後方向に揺動する前後ロッドと、前記ルーパ棒を支持し、軸線方向に形成されたガイド孔により、ルーパ棒の軸線方向の運動を規制するルーパ棒ガイドと、前記ルーパ棒ガイドの一端側に突設され、前後方向に係合孔が形成された前後動用アームとを備えたルーパ駆動装置において、前記前後動用アームと前後ロッドとは、前記係合孔に係合する突起部が形成されるとともに、その頭部がル−パ側に配置されたねじ部材と、反ルーパ側から前記ねじ部材に螺合するナットにより、位置調整可能に連結され、前記前後ロッドは、ルーパ側から下軸端部に装備された偏心輪と、反ルーパ側に装備された支持板とにより、揺動可能に挟まれ配置されるとともに、ルーパと針との間隔調整時に操作するナットに接近する前記支持板の所定位置に切欠部を設け、前記水平駆動機構は、一端側が前記ルーパ棒ガイドのガイド孔に嵌合し、他端側が前記調整ねじにより前記ルーパ棒に固定されるスライダとを有し、前記調整ねじは、前記スライダーを保持するホルダ上でルーパ棒ガイドの前後動アーム側に備えられ、前記スライダと前記ガイド孔の間の摺動面相互の隙間の大きさを前記調整ねじの操作で調整する際、前記調整ねじが前記ねじ部材の頭部によって隠れないように、前記調整ねじのホルダ上の位置を設定したことを特徴とする。
【００１５】
このように構成されたルーパ駆動装置においては、前後駆動機構におけるルーパの短軸方向の運動軌道を適正にするために、前後ロッドと前後動用アームとを連結している連結手段による締め付けを緩めたり、あるいは再締め付けする際、連結手段を構成するねじ部材は突起部によって前後動用アームに回り止めされているため、工具で操作するのは、反ルーパ側に位置したナットだけで済み、一方の手だけで簡単に操作することができる。そして、緩めたねじ部材を移動させることで、ねじ部材による前後ロッドと前後動用アームとの連結位置の調整が簡単にでき、連結手段の操作が行い難いという従来の問題を解消できることになる。
【００１６】
削除
【００１７】
このように構成されたルーパ駆動装置においては、連結手段を構成しているナットと、支持板の外周部との間の隙間が、支持板に形成した切欠部によって広がっているため、ナットへの工具の装着時に、支持板が邪魔になるという従来の問題も解消される。
【００１８】
削除
【００１９】
このように構成されたルーパ駆動装置においては、水平駆動機構におけるルーパの長軸方向の運動軌道を適正にするために、スライダとガイド孔の間の摺動面相互の隙間の大きさをホルダーに装備した調整ねじの操作で調整する際、前記調整ねじが前後駆動機構の連結手段によって隠れていないため、工具等で、簡単に調整ねじを操作することができ、調整ねじが連結手段に隠れているため操作性が悪いという従来の問題を解消できることになる。
【００２０】
【発明の実施の形態】
以下、本発明に係るルーパ駆動装置の実施形態を図面に基づいて詳細に説明する。図１乃至図４は本発明に係るルーパ駆動装置の一実施形態を示したものである。
【００２１】
この一実施形態のルーパ駆動装置２００は、二重環縫いミシンや偏平縫いミシン等に装備されるルーパに、針の上下動に同期して、長円軌道の運動を付与するもので、ミシンの針３９の上下動方向Ｙおよび布送り方向Ｚのそれぞれと略直交するＸ方向に沿って配置されるルーパ棒２６と、このルーパ棒２６の先端に軸線を外して装備されたルーパ３８と、ミシンの下軸２１の回転をルーパ棒２６の軸線方向の往復運動に変換する水平駆動機構５１と、下軸２１の回転をルーパ棒２６の軸線回りの往復回動運動に変換する前後駆動機構５２とを備えている。
【００２２】
水平駆動機構５１は、ルーパ棒２６に嵌合固定される一対のホルダー２７，２８と、一方のホルダー２７に調整ねじ３７により固定されるスライダ３６と、このスライダ３６の嵌合するガイド孔３５ａがルーパ棒２６の軸線方向に沿って設けられて、スライダ３６を介してルーパ棒２６を軸線方向に摺動自在に支持するルーパ棒ガイド３５と、上端が下軸２１の端部のクランク部２１ａに取り付けられて下軸２１の回転によって上下動するルーパロッド２２と、下軸２１と直交する水平面内で回転自在にミシンフレームに支承されたルーパ軸２４と、このルーパ軸２４とルーパロッド２２の先端とを連結してルーパロッド２２の上下動をルーパ軸２４の軸線回りの往復回動運動に変換するルーパ腕２３と、基端がルーパ軸２４に嵌合固定されるとともに先端２５ａが一対のホルダー２７，２８に挾持され、ルーパ軸２４の往復回動運動によって先端２５ａがルーパ棒２６の軸線方向に沿って揺動する揺動腕２５とを備えて、揺動腕２５の揺動運動によってルーパ棒２６に軸線方向の往復運動を付与する。
【００２３】
なお、ガイド孔３５ａおよびスライダ１３の摺動面に摩耗が生じても、摺動面間の隙間の調整により安定したガイド性能を維持できるように、ルーパ棒ガイド３５およびスライダ３６の摺動面は、従来と同様に、テーパ面に設定されている。また、調整ねじ３７は、スライダ３６の取付位置を上下方向に移動調整することで、ガイド孔３５ａの摺動面とスライダ３６の摺動面との間の隙間を調整可能にしている。
【００２４】
前後駆動機構５２は、支持板４６を挿通した下軸２１の端部に嵌合固定された偏心輪２９と、この偏心輪２９と支持板４６とによって揺動可能に挟まれて配されるとともに先端部３０Ｔが偏心輪２９の回転に連動してミシンの前後方向に揺動する前後ロッド３０と、ルーパ棒ガイド３５の一側に突設された前後動用アーム４２と、前後ロッド３０の先端部３０Ｔと前後動用アーム４２とをねじ部材により連結する連結手段４４とを備えて、前後ロッド３０から前後動用アーム４２に伝達する押し引き力でルーパ棒ガイド３５とルーパ棒２６とを一体にルーパ棒２６の軸線回りに回動させることで、ルーパ棒２６に軸線回りの往復回動運動を付与する。
【００２５】
本実施形態の場合、図１に示すように、スライダ３６とガイド孔３５ａとの嵌合状態の調整のために調整ねじ３７を操作する際に、調整ねじ３７が連結手段４４によって隠れないように、ホルダー２７およびスライダ３６の軸方向の寸法や、調整ねじ３７の装備位置を設定している。
【００２６】
また、連結手段４４は、軸部がルーパ３８側から前後動用アーム４２および前後ロッド３０に挿通されるとともに、頭部が前後動用アーム４２に係合する突起部（ピン）３１により回り止めされるねじ部材３２と、反ルーパ側からねじ部材３２に螺合するナット３４とを備えている。更に、図３に示すように、前後動用アーム４２に貫通形成されるねじ部材３２用の挿通孔４２ａと突起部３１用の係合孔４２ｂとを、連結位置調整方向に長い長孔に形成している。
【００２７】
なお、前後動用アーム４２上の挿通孔４２ａおよび係合孔４２ｂを、連結位置調整方向に長い長孔にする代わりに、前後ロッド３０上のねじ部材３２用の挿通孔３０ａを、連結位置調整方向に長い長孔に形成するようにしても良い。
【００２８】
また、本実施形態では、図４に示すように、ルーパと針との間隔調整時には、ねじ部材３２による締め付けを緩めるために、ナット３４を操作する。その際に、ナット３４に接近する前記支持板４６の外周部の所定位置に、ナット３４との間の隙間を広げる切欠部４６ａを設けたことを特徴とするものである。
【００２９】
以上のルーパ駆動装置２００は、水平駆動機構５１および前後駆動機構５２のそれぞれがルーパ棒２６に付与する運動の合成によって、ルーパ３８の針落ち位置Ａの周囲を回る長円軌道Ｂの運動を実現する。
【００３０】
以上に説明したルーパ駆動装置２００では、前後駆動機構５２におけるルーパの短軸方向の運動軌道を適正にするために、前後ロッド３０と前後動用アーム４２とを連結している連結手段４４による締め付けを緩めたり、あるいは再締め付けする際、連結手段４４を構成するねじ部材３２は突起部３１によって前後動用アーム４２に回り止めされているため、工具で操作するのは、反ルーパ側に位置したナット３４だけで済み、一方の手だけで簡単に操作することができる。そして、緩めたねじ部材を移動させることで、ねじ部材による前後ロッド３０と前後動用アーム４２との連結位置の調整が簡単にでき、連結手段の操作が行い難いという従来の問題を解消できることになる。
【００３１】
従って、前後駆動機構５２によるルーパ棒２６の軸線回りの往復回動範囲を、簡単に適正な状態に調整することができ、ルーパの運動軌道の安定による高品位な縫い目の維持が容易になる。
【００３２】
更に、本実施形態のルーパ駆動装置２００では、本実施形態のルーパ駆動装置２００では、連結手段４４を構成しているナット３４と、支持板４６の外周部との間の隙間が、支持板４６に形成した切欠部４６ａによって広がっているため、ナット３４への工具の装着時に、支持板４６が邪魔になることもなく、連結手段４４の操作性が更に良好になる。
【００３３】
また、本実施の形態のルーパ駆動装置２００では、水平駆動機構５１におけるルーパ３８の長軸方向の運動軌道を適正にするために、スライダ３６とガイド孔３５ａの間の摺動面相互の隙間の大きさを一方のホルダー２７に装備した調整ねじ３７の操作で調整する際、調整ねじ３７が前後駆動機構５２の連結手段４４によって隠れていないため、工具等で、簡単に調整ねじ３７を操作することができ、調整ねじ１６が連結手段１５に隠れているため操作性が悪いという従来の問題を解消できることになる。
【００３４】
従って、水平駆動機構５１によるルーパ棒２６の軸線方向の往復運動軌道を、簡単に適正な状態に調整することができ、ルーパ３８の運動軌道の安定による高品位な縫い目の維持が容易になる。
【００３５】
【発明の効果】
以上に説明したように、請求項１に記載した本発明のルーパ駆動装置によれば、前後駆動機構におけるルーパの短軸方向の運動軌道を適正にするために、前後ロッドと前後動用アームとを連結している連結手段による締め付けを緩めたり、あるいは再締め付けする際、連結手段を構成するねじ部材は突起部によって前後動用アームに回り止めされているため、工具で操作するのは、反ルーパ側に位置したナットだけで済み、一方の手だけで簡単に操作することができる。そして、緩めたねじ部材を移動させることで、ねじ部材による前後ロッドと前後動用アームとの連結位置の調整が簡単にでき、連結手段の操作が行い難いという従来の問題を解消できることになる。従って、前後駆動機構によるルーパ棒の軸線回りの運動範囲を、簡単に適正な状態に調整することができ、ルーパの運動軌道の安定による高品位な縫い目の維持が容易になる。
【００３６】
また、請求項１に記載のルーパ駆動装置によれば、連結手段を構成しているナットと、支持板の外周部との間の隙間が、支持板に形成した切欠部によって広がっているため、ナットへの工具の装着時に、支持板が邪魔になるという従来の問題も解消され、連結手段の操作性が更に良好になる。
【００３７】
更に、請求項１に記載のルーパ駆動装置によれば、水平駆動機構におけるルーパの長軸方向の運動軌道を適正にするために、スライダとガイド孔の間の摺動面相互の隙間の大きさをホルダーに装備した調整ねじの操作で調整する際、前記調整ねじが前後駆動機構の連結手段によって隠れていないため、工具等で、簡単に調整ねじを操作することができ、調整ねじが連結手段に隠れているため操作性が悪いという従来の問題を解消できることになる。従って、水平駆動機構によるルーパ棒の軸線方向の運動軌道を、簡単に適正な状態に調整することができ、ルーパの運動軌道の安定による高品位な縫い目の維持が容易になる。
【図面の簡単な説明】
【図１】本発明に係るルーパ駆動装置の一実施の形態のミシン後面側からの斜視図である。
【図２】本発明に係るルーパ駆動装置の一実施の形態のミシン前面側からの斜視図である。
【図３】図１に示したルーパ棒ガイドの矢印Ｃ方向からの斜視図である。
【図４】図１のＤ矢視図である。
【図５】従来のルーパ駆動装置のミシン後面側からの斜視図である。
【図６】従来のルーパ駆動装置のミシン前面側からの斜視図である。
【符号の説明】
２１下軸
２５揺動腕
２５ａ先端
２６ルーパ棒
２７，２８ホルダー
２９偏心輪
３０前後ロッド
３０Ｔ先端部
３０ａ挿通孔
３１突起部（ピン）
３２ねじ部材
３４ナット
３５ルーパ棒ガイド
３５ａガイド孔
３６スライダ
３７調整ねじ
３８ルーパ
４２前後動用アーム
４２ａ挿通孔
４２ｂ係合孔
４４連結手段
４６支持板
４６ａ切欠部
５１水平駆動機構
５２前後駆動機構
２００ルーパ駆動装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a looper driving device that imparts an elliptical orbital motion to a looper installed in a double chain stitch sewing machine, a flat stitch sewing machine, or the like, and more particularly, facilitates an adjustment operation of the motion trajectory of the looper. It is about the improvement for.
[0002]
[Prior art]
The looper of the double chain stitch machine and the flat stitch machine has a forward movement along the back side of the needle drop position and a retraction action along the front side of the needle drop position on the lower side of the needle plate that is the feed surface of the fabric. The needle thread loop formed on the back side of the needle that normally runs during advancement is pulled out and synchronized with the vertical movement of the needle, and the looper thread left behind at the time of retraction is moved down by the needle In this case, the seam is formed by forming a seam in which the needle thread and the looper thread are looped on the back surface of the fabric. Such a movement trajectory of the looper is an elliptical trajectory having a long axis in the axial direction orthogonal to the vertical movement direction of the needle and the cloth feeding direction.
[0003]
FIG. 5 and FIG. 6 show a conventional example of a looper driving device that realizes such an elliptical orbital motion of the looper. The looper driving device 100 shown here is equipped with a looper bar 6 disposed substantially orthogonal to the vertical movement direction and the cloth feed direction of the needle of the sewing machine, and the axis of the looper bar 6 with its axis removed. The looper 9, the horizontal drive mechanism 71 that converts the rotation of the lower shaft 1 of the sewing machine into the reciprocating motion of the looper rod 6 in the axial direction, and the rotation of the lower shaft 1 is converted into a reciprocating rotational motion around the axis of the looper rod 6. A front-rear drive mechanism 72 is provided.
[0004]
The horizontal drive mechanism 71 includes a pair of holders 7 and 8 that are fitted and fixed to the looper bar 6, a slider 13 that is fixed to one holder 7 by an adjusting screw 16, and a guide hole 12 a that the slider 13 is fitted to. A looper rod guide 12 provided along the axial direction of the looper rod 6 and slidably supporting the looper rod 6 in the axial direction via a slider 13, and a crank portion 1 a having an upper end at the end of the lower shaft 1. A looper rod 2 that is attached and moves up and down by the rotation of the lower shaft 1, a looper shaft 4 that is rotatably supported in a horizontal plane perpendicular to the lower shaft 1, and the looper shaft 4 and the tip of the looper rod 2. The looper arm 3 is connected to convert the vertical movement of the looper rod 2 into a reciprocating rotational motion around the axis of the looper shaft 4, the proximal end is fitted and fixed to the looper shaft 4, and the distal end 5 a is a pair of holders 7. 8 is provided with a swing arm 5 whose tip 5a swings along the axial direction of the looper rod 6 by reciprocating rotation of the looper shaft 4, and the looper rod 6 by the swing motion of the swing arm 5. Is given a reciprocating motion in the axial direction.
[0005]
Even if the sliding surfaces of the guide hole 12a and the slider 13 are worn, the sliding surfaces of the looper bar guide 12 and the slider 13 are tapered so that stable guide performance can be maintained by adjusting the gap between the sliding surfaces. Is set on the surface. The adjustment screw 16 can adjust the clearance between the sliding surface of the guide hole 12a and the sliding surface of the slider 13 by moving and adjusting the mounting position of the slider 13 in the vertical direction.
[0006]
The front-rear drive mechanism 72 is disposed so as to be swingable between the eccentric wheel 10 fitted and fixed to the end of the lower shaft 1 through which the support plate 19 is inserted, and the eccentric wheel 10 and the support plate 19. A front / rear rod 11 whose front end portion 11a swings in the front / rear direction of the sewing machine in conjunction with the rotation of the eccentric ring 10, a front / rear movement arm 18 projecting from one side of the looper bar guide 12, and a front end portion of the front / rear rod 11 11a and a forward / backward movement arm 18 are connected to each other by a screw member 15, and the looper bar guide 12 and the looper bar 6 are integrated with each other by a pushing / pulling force transmitted from the front / rear rod 11 to the forward / backward movement arm 18. By rotating around the axis 6, the looper rod 6 is given a reciprocating rotation around the axis.
[0007]
In the case of this conventional example, the connecting means 15 includes a screw member 15a inserted from the looper side into the forward / backward movement arm 18 and the front / rear rod 11 and a nut 15b screwed into the tip of the screw member 15a protruding from the front / rear rod 11. By fastening, the front / rear rod 11 and the forward / backward movement arm 18 are connected.
[0008]
An insertion hole 18a for inserting the screw member 15a formed through the forward / backward movement arm 18 is connected to the front / rear rod 11 and the forward / backward movement arm 18 in order to correct or adjust the rotation range of the looper bar 6. A long slot is set along the connecting position adjustment direction so that the position can be shifted.
[0009]
The looper driving device 100 described above realizes the motion of the elliptical orbit B that rotates around the needle drop position A of the looper 9 by combining the motions that the horizontal driving mechanism 71 and the front-rear driving mechanism 72 impart to the looper bar 6. To do.
[0010]
[Problems to be solved by the invention]
By the way, in order to form a high-quality seam, it is indispensable to adjust the motion trajectory of the looper 9 to an appropriate position. In order to adjust the movement path of the looper 9 to an appropriate position, the size of the gap between the sliding surfaces between the slider 13 and the guide hole 12a is adjusted appropriately, and the longitudinal rod 11 and the longitudinal movement are used. It is necessary to adjust the connection position with the arm 18 appropriately, and these adjustment operations are repeated according to wear of the sliding portion.
[0011]
However, in the conventional case, as shown in the figure, since the adjusting screw 16 is in a position hidden behind the head of the connecting means 15b of the connecting means 15, it is difficult to operate the adjusting screw 16, and the space between the slider 13 and the guide hole 12a There was a problem that the clearance between the sliding surfaces could not be easily adjusted.
[0012]
In order to adjust the connecting position between the front / rear rod 11 and the forward / backward movement arm 18, when operating the connecting means 15, the connecting means 15 must be engaged unless both the screw member 15 a and the nut 15 b are grasped by a tool. There was also a problem that the fastening could not be loosened or retightened, and both hands were closed to grip both the screw member 15a and the nut 15b, making it difficult to perform the operation. Furthermore, when the tool is mounted on the nut 15b from the anti-looper side, the tool may interfere with the edge of the support plate 19 and it may be difficult to operate the tool.
[0013]
The present invention has been made in view of the above-described problems, and an object of the present invention is to make it easy to adjust the movement trajectory of the looper and to easily maintain a high-quality seam by stabilizing the movement trajectory of the looper. It is to provide a driving device.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a looper driving device according to the present invention includes a looper rod having a looper attached to the tip and disposed in a direction perpendicular to the cloth feeding direction, as described in claim 1; A horizontal drive mechanism that converts rotation of the lower shaft into motion in the axial direction of the looper rod; and a front-rear drive mechanism that converts rotation of the lower shaft into motion around the axis of the looper rod; and the horizontal drive mechanism, A looper drive device that imparts an elliptical motion to the looper by a front-rear drive mechanism , wherein the front-rear drive mechanism supports the front-rear rod that swings in the front-rear direction as the lower shaft rotates, and the looper rod. A looper bar guide that restricts the movement of the looper bar in the axial direction by a guide hole formed in the axial direction; and a forward and backward movement projecting on one end side of the looper bar guide and having an engagement hole in the front-rear direction Lou that example Bei and an arm In the driving device, wherein the longitudinal and movement arm and longitudinal rod, with projections for engaging the engagement hole is formed, the head Le - a screw member disposed on path side, from the opposite looper side The nut is engaged with the screw member so as to be adjusted in position. The front and rear rods are oscillated by an eccentric wheel provided on the lower shaft end from the looper side and a support plate provided on the anti-looper side. A notch portion is provided at a predetermined position of the support plate that is disposed so as to be movable and is close to a nut that is operated when adjusting a distance between the looper and the needle, and the horizontal drive mechanism has one end side that is a guide of the looper bar guide. A slider that fits into the hole and has the other end fixed to the looper bar by the adjusting screw, and the adjusting screw is provided on the front and rear arm side of the looper bar guide on the holder that holds the slider. , When adjusting the size of the gap between the sliding surfaces between the slider and the guide hole by the operation of the adjusting screw, the adjusting screw holder is arranged so that the adjusting screw is not hidden by the head of the screw member. The upper position is set .
[0015]
In the looper drive device configured as described above, in order to make the motion trajectory in the short axis direction of the looper in the front-rear drive mechanism appropriate, the tightening by the connecting means that connects the front-rear rod and the front-rear movement arm is loosened. Alternatively, when re-tightening, the screw member constituting the connecting means is prevented from rotating around the forward / backward movement arm by the protrusion, so that only the nut located on the anti-looper side can be operated with the tool, Easy operation. Then, by moving the loosened screw member, it is possible to easily adjust the connection position of the front / rear rod and the forward / backward movement arm by the screw member, and it is possible to solve the conventional problem that it is difficult to operate the connecting means.
[0016]
Delete [0017]
In the looper driving device configured in this way, the gap between the nut constituting the connecting means and the outer peripheral portion of the support plate is widened by the notch formed in the support plate. The conventional problem that the support plate gets in the way when the tool is mounted is also eliminated.
[0018]
Delete [0019]
In the looper driving device configured as described above, the size of the gap between the sliding surfaces between the slider and the guide hole is set in the holder in order to make the movement path of the long axis of the looper in the horizontal driving mechanism appropriate. When adjusting by operating the equipped adjustment screw, the adjustment screw is not hidden by the connecting means of the front and rear drive mechanism, so the adjustment screw can be easily operated with a tool or the like, and the adjustment screw is hidden by the connecting means. Therefore, the conventional problem of poor operability can be solved.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a looper drive device according to the present invention will be described below in detail with reference to the drawings. 1 to 4 show an embodiment of a looper driving device according to the present invention.
[0021]
The looper driving device 200 according to this embodiment applies a motion of an elliptical orbit to a looper mounted on a double chain stitch sewing machine, a flat stitch sewing machine or the like in synchronization with the vertical movement of a needle. A looper bar 26 disposed along the X direction substantially perpendicular to each of the vertical movement direction Y and the cloth feed direction Z of the needle 39; a looper 38 equipped with the axis line removed from the tip of the looper bar 26; A horizontal drive mechanism 51 that converts the rotation of the lower shaft 21 into a reciprocating motion in the axial direction of the looper rod 26; a front-rear drive mechanism 52 that converts the rotation of the lower shaft 21 into a reciprocating rotational motion around the axis of the looper rod 26; It has.
[0022]
The horizontal drive mechanism 51 includes a pair of holders 27 and 28 that are fitted and fixed to the looper bar 26, a slider 36 that is fixed to one holder 27 by an adjusting screw 37, and a guide hole 35a that the slider 36 is fitted to. A looper bar guide 35 provided along the axial direction of the looper bar 26 and slidably supporting the looper bar 26 in the axial direction via a slider 36, and a crank part 21 a at the upper end of the lower shaft 21. A looper rod 22 that is attached and moves up and down by the rotation of the lower shaft 21, a looper shaft 24 that is rotatably supported in a horizontal plane perpendicular to the lower shaft 21, and the looper shaft 24 and the tip of the looper rod 22. A looper arm 23 that connects and converts the vertical movement of the looper rod 22 into a reciprocating rotational movement around the axis of the looper shaft 24 is fitted and fixed to the looper shaft 24. The tip 25a is held by a pair of holders 27 and 28, and the tip 25a is provided with a swing arm 25 that swings along the axial direction of the looper rod 26 by the reciprocating rotation of the looper shaft 24. The reciprocating motion in the axial direction is applied to the looper rod 26 by the swing motion of 25.
[0023]
Even if the sliding surfaces of the guide hole 35a and the slider 13 are worn, the sliding surfaces of the looper bar guide 35 and the slider 36 are maintained so that stable guide performance can be maintained by adjusting the gap between the sliding surfaces. As in the conventional case, it is set to a tapered surface. The adjustment screw 37 adjusts the gap between the sliding surface of the guide hole 35a and the sliding surface of the slider 36 by moving and adjusting the mounting position of the slider 36 in the vertical direction.
[0024]
The front-rear drive mechanism 52 is disposed so as to be swingable between the eccentric wheel 29 fitted and fixed to the end of the lower shaft 21 through which the support plate 46 is inserted, and the eccentric wheel 29 and the support plate 46. The front / rear rod 30 whose front end 30T swings in the front / rear direction of the sewing machine in conjunction with the rotation of the eccentric ring 29, the front / rear movement arm 42 projecting from one side of the looper bar guide 35, and the front end of the front / rear rod 30 30T and a connecting means 44 for connecting the forward / backward movement arm 42 with a screw member, and the looper bar guide 35 and the looper bar 26 are integrally formed by a push / pull force transmitted from the front / rear rod 30 to the forward / backward movement arm 42. By rotating around the axis of 26, the looper rod 26 is given a reciprocating rotation around the axis.
[0025]
In the case of this embodiment, as shown in FIG. 1, when the adjustment screw 37 is operated to adjust the fitting state between the slider 36 and the guide hole 35 a, the adjustment screw 37 is not hidden by the connecting means 44. The dimensions of the holder 27 and the slider 36 in the axial direction and the installation position of the adjusting screw 37 are set.
[0026]
Further, the connecting means 44 is inserted into the forward / backward movement arm 42 and the forward / backward rod 30 from the looper 38 side, and the head portion is prevented from rotating by a protrusion (pin) 31 that engages with the forward / backward movement arm 42. A screw member 32 and a nut 34 screwed into the screw member 32 from the anti-looper side are provided. Furthermore, as shown in FIG. 3, an insertion hole 42a for the screw member 32 and an engagement hole 42b for the protrusion 31 that are formed through the forward / backward movement arm 42 are formed as long holes in the connecting position adjustment direction. ing.
[0027]
Instead of making the insertion hole 42a and the engagement hole 42b on the arm 42 for longitudinal movement long and long in the connection position adjustment direction, the insertion hole 30a for the screw member 32 on the front / rear rod 30 is connected to the connection position adjustment direction. Alternatively, it may be formed into a long long hole.
[0028]
In the present embodiment, as shown in FIG. 4, when adjusting the distance between the looper and the needle, the nut 34 is operated to loosen the tightening by the screw member 32. At that time, a notch 46 a that widens the gap with the nut 34 is provided at a predetermined position on the outer peripheral portion of the support plate 46 that approaches the nut 34.
[0029]
The looper driving device 200 described above realizes the motion of the elliptical orbit B around the needle drop position A of the looper 38 by synthesizing the motions applied to the looper rod 26 by the horizontal driving mechanism 51 and the front and rear driving mechanism 52, respectively. To do.
[0030]
In the looper driving device 200 described above, in order to make the movement path in the short axis direction of the looper in the longitudinal driving mechanism 52 appropriate, the fastening by the connecting means 44 that connects the longitudinal rod 30 and the longitudinal movement arm 42 is performed. When loosening or retightening, the screw member 32 constituting the connecting means 44 is prevented from rotating around the forward / backward movement arm 42 by the protrusion 31. Therefore, the nut 34 positioned on the anti-looper side is operated by a tool. It can be easily operated with just one hand. Then, by moving the loosened screw member, it is possible to easily adjust the connecting position of the front / rear rod 30 and the forward / backward movement arm 42 by the screw member, and it is possible to solve the conventional problem that it is difficult to operate the connecting means. .
[0031]
Therefore, the reciprocating rotation range around the axis of the looper rod 26 by the front-rear drive mechanism 52 can be easily adjusted to an appropriate state, and high-quality seams can be easily maintained due to the stability of the movement path of the looper.
[0032]
Furthermore, in the looper driving device 200 of the present embodiment, in the looper driving device 200 of the present embodiment, the gap between the nut 34 constituting the connecting means 44 and the outer peripheral portion of the support plate 46 is the support plate 46. Therefore, when the tool is mounted on the nut 34, the support plate 46 does not get in the way and the operability of the connecting means 44 is further improved.
[0033]
Further, in the looper driving device 200 of the present embodiment, the gap between the sliding surfaces between the slider 36 and the guide hole 35a is set in order to make the movement path in the long axis direction of the looper 38 in the horizontal driving mechanism 51 appropriate. When adjusting the size by operating the adjusting screw 37 provided in one holder 27, the adjusting screw 37 is not hidden by the connecting means 44 of the front-rear drive mechanism 52, so that the adjusting screw 37 can be easily operated with a tool or the like. Therefore, the conventional problem that the operability is poor because the adjusting screw 16 is hidden behind the connecting means 15 can be solved.
[0034]
Accordingly, the reciprocating motion trajectory of the looper rod 26 in the axial direction by the horizontal drive mechanism 51 can be easily adjusted to an appropriate state, and high-quality stitches can be easily maintained by stabilizing the motion trajectory of the looper 38.
[0035]
【The invention's effect】
As described above, according to the looper drive device of the present invention described in claim 1, in order to make the movement trajectory of the short axis direction of the looper in the front-rear drive mechanism appropriate, the front-rear rod and the front-rear movement arm are When loosening or retightening the connected connecting means, the screw member that constitutes the connecting means is locked against the forward / backward movement arm by the projection, so it is necessary to operate with a tool on the anti-looper side Only a nut located at the bottom is required, and it can be easily operated with only one hand. Then, by moving the loosened screw member, it is possible to easily adjust the connection position of the front / rear rod and the forward / backward movement arm by the screw member, and it is possible to solve the conventional problem that it is difficult to operate the connecting means. Therefore, the range of motion of the looper rod around the axis of the front / rear drive mechanism can be easily adjusted to an appropriate state, and high-quality seams can be easily maintained by stabilizing the motion trajectory of the looper.
[0036]
Further, according to the looper driving device of the first aspect, since the gap between the nut constituting the connecting means and the outer peripheral portion of the support plate is widened by the notch portion formed in the support plate, The conventional problem that the support plate becomes an obstacle when the tool is mounted on the nut is solved, and the operability of the connecting means is further improved.
[0037]
Further, according to the looper driving device of the first aspect, the size of the gap between the sliding surfaces between the slider and the guide hole is set in order to make the movement path in the major axis direction of the looper in the horizontal driving mechanism appropriate. When adjusting by operating the adjusting screw mounted on the holder, the adjusting screw is not hidden by the connecting means of the front and rear drive mechanism, so the adjusting screw can be easily operated with a tool, etc. Therefore, the conventional problem of poor operability can be solved. Therefore, the motion track in the axial direction of the looper bar by the horizontal drive mechanism can be easily adjusted to an appropriate state, and high-quality seams can be easily maintained by stabilizing the motion track of the looper.
[Brief description of the drawings]
FIG. 1 is a perspective view from the rear side of a sewing machine according to an embodiment of a looper driving device according to the present invention.
FIG. 2 is a perspective view from the front side of the sewing machine of an embodiment of the looper driving device according to the present invention.
3 is a perspective view of the looper bar guide shown in FIG. 1 as viewed from the direction of arrow C. FIG.
4 is a view as seen from the direction of arrow D in FIG. 1;
FIG. 5 is a perspective view of a conventional looper drive device from the rear side of the sewing machine.
FIG. 6 is a perspective view of a conventional looper drive device from the front side of the sewing machine.
[Explanation of symbols]
21 Lower shaft 25 Swing arm 25a Tip 26 Looper rod 27, 28 Holder 29 Eccentric ring 30 Front / rear rod 30T Tip 30a Insertion hole 31 Projection (pin)
32 Screw member 34 Nut 35 Looper bar guide 35a Guide hole 36 Slider 37 Adjustment screw 38 Looper 42 Front and rear movement arm 42a Insertion hole 42b Engagement hole 44 Connection means 46 Support plate 46a Notch 51 Horizontal drive mechanism 52 Front and rear drive mechanism 200 Looper drive apparatus

Claims

A looper rod having a looper attached to the tip and disposed in a direction perpendicular to the cloth feeding direction;
A horizontal drive mechanism that converts the rotation of the lower shaft into the axial movement of the looper rod;
A front-rear drive mechanism that converts rotation of the lower shaft into movement around the axis of the looper rod;
With
A looper drive device that imparts an ellipse motion to the looper by the horizontal drive mechanism and the front-rear drive mechanism ,
The front / rear drive mechanism includes a front / rear rod that swings in the front / rear direction as the lower shaft rotates,
A looper bar guide that supports the looper bar and restricts the movement of the looper bar in the axial direction by a guide hole formed in the axial direction;
Said looper bar guide protruding from the one end of the looper driving device example Bei an arm forward-rearward movement of the engaging hole is formed in the longitudinal direction,
The forward / backward movement arm and the forward / backward rod are formed with a protrusion that engages with the engagement hole, a head member disposed on the looper side, and a screw member from the anti-looper side to the screw member. It is connected by a nut to be screwed so that the position can be adjusted ,
The front and rear rods are arranged so as to be swingable between an eccentric wheel mounted on the lower shaft end from the looper side and a support plate mounted on the anti-looper side, and adjusting the distance between the looper and the needle. A notch is provided at a predetermined position of the support plate that approaches the nut that is sometimes operated,
The horizontal drive mechanism has a slider having one end fitted into the guide hole of the looper bar guide and the other end fixed to the looper bar by the adjustment screw, and the adjustment screw holds the slider The adjustment screw is provided on the forward / backward movement arm side of the looper bar guide on the holder, and the adjustment screw adjusts the size of the clearance between the sliding surfaces between the slider and the guide hole by operating the adjustment screw. A looper driving device characterized in that the position of the adjusting screw on the holder is set so as not to be hidden by the head of the member .