JP3775437B2 - Embroidery sewing machine - Google Patents

Embroidery sewing machine Download PDF

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JP3775437B2
JP3775437B2 JP09563594A JP9563594A JP3775437B2 JP 3775437 B2 JP3775437 B2 JP 3775437B2 JP 09563594 A JP09563594 A JP 09563594A JP 9563594 A JP9563594 A JP 9563594A JP 3775437 B2 JP3775437 B2 JP 3775437B2
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yarn
piece
operating
movable blade
thread
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JPH07279032A (en
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勝 江里口
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株式会社バルダン
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Description

【0001】
【産業上の利用分野】
この発明は布に刺繍縫いを施す為に用いる刺繍ミシンに関する。更に詳しくは、上記刺繍ミシンにおいて布に対する刺繍縫いを終えた縫糸を切断する装置に関する。
【0002】
【従来の技術】
この種の刺繍ミシンに係る技術事項は、例えば特開平5−239757号公報に示されている。その公報の記載内容は、次の「公知技術欄」に記載の通りである。尚上記公報における図1、2、5、7、9は、添付図面において本願の実施例を示す図1〜図9と区別する為に、図10〜14として順に示した。
【0003】
公知技術欄
『・・(前略)・・図1、2には多頭刺繍ミシンにおける一つのベッド1が示される。このようなベッド1は図1の左右方向に複数が並設されている。各ベッド1の上方には夫々ミシンヘッドが設けられている。図2にはミシンヘッドに備えられた上下動自在の縫製用の鉤針が符号11で示される。ベッド1には複数のルーパ4やそれを選択的に駆動する為の駆動歯車2、その他以降に説明する種々の機構が備わっている。
・・(中略)・・
ベッド1におけるベッドフレーム1aは、多頭刺繍ミシンにおけるミシンフレーム5に取付けたフレーム本体6とその本体6に被せ付けた天板7から成る。天
板7には周知のように針板8が取付けてある。針板8には針孔9と糸引き上げ孔10が設けてある。
・・(中略)・・
次に駆動歯車2及びそれに関連する機構について説明する。図1、2に示す如く、フレーム本体6には支持ブラケット13が固着してあり、ブラケット13に回動自在に装着した鉛直状態の駆動軸14の上端に駆動歯車2が取付けてある。・・(中略)・・
前記複数のルーパ4は図1、2に示すルーパアセンブリ21の一構成部品として備わっている。ルーパアセンブリ21は可動枠3を有する。フレーム本体6にはレール22が取付けられ、レール22上を移動自在なスライド体23が可動枠3に取付けてあり、その結果可動枠3がフレーム本体6に対して図1の左右方向に直線的に横移動し得るようになっている。・・(中略)・・
図1に示す如く、ルーパアセンブリ21は各ルーパ4に関して夫々個別に設けられた糸保持手段60を有する。各糸保持手段60は図6に示すように一対の把持片62, 63を有する。把持片62は可動枠3に固定したベース61に取付けてある。把持片63はピン64によって把持片62に枢着してあり、把持片62との間に糸を把持する。・・(中略)・・
次にベッド1は、針落位置にあるルーパ4を図2および図9に示される如くその軸線方向に位置替えさせる為の昇降機構32を備えている。・・(中略)・・
次に図2、5、12に示される如く、ベッド1は糸引寄機構75を有する。該機構75は、針孔9と針落位置にあるルーパ4との間の糸を、そのルーパ4に関連する糸保持手段60の箇所まで引き寄せる為のものである。ガイド76, 77が天板7の下面に取付けてある。スライダ78がガイド76, 77に案内されて進退が可能である。スライダ78には上側引寄片79と下側引寄片80とが一体に形成してある。図12の(B)及び(D)に示す如く、上側引寄片79は把持片62, 63の上側の位置へ向けての移動が可能であり、下側引寄片80は把持片62, 63の下側の位置へ向けての移動が可能である。これらの引寄片79, 80は糸を横ずれさせることなく引寄せる為の窪み79a, 80aを有する。スライダ78には操作機構との連繋片81が備わっている。
・・(中略)・・
図7に糸引寄機構75の為の操作機構83が示される。水平状態の操作軸84が多数のベッド1を貫通する状態に設けられ、その一端には操作用のモータ85が連結してある。各ベッド1において、操作軸84にはカム86が取付いている。レバー88はその一端においてフレーム本体6に枢着されている。レバー88の中間に備えられた従動子89がカム86のカム溝87に係合している。レバー88の他端に備えられた連繋部材90が連繋片81と係合している。上記モータ85が回動するとカム86が回動し、レバー88が矢印方向に揺動する。その結果、スライダ78及び引寄片79, 80が矢印方向に進退動する。
・・(中略)・・
次に図12の(B)に示される如く、糸保持手段60の上側にはその場所において縫糸を切断する為の空間91が設けられ、その空間91には図5に示す如き糸切断機構92が備わっている。一対のメス94, 95から成るカッタ93が、針落位置にあるルーパ4に関連した糸保持手段60の上側に設けられている。メス94は天板7の下面に固定され、メス95はメス94に対しピン96によって枢着してある。一対のガイド97, 98が天板7の下面に取付けてある。操作片99がガイド97, 98に案内されて進退可能である。該操作片99は一端に係合片100 を有し、それは動メス95に形成された長孔101 と係合している。操作片99は他端に操作機構との連繋片102 を有する。
・・(中略)・・
図7に糸切断機構92の為の操作機構105 が示される。該操作機構105 は前記糸引寄機構75の為の操作機構83と同様の構成で、カム106 、カム溝107 、レバー108 、従動子109 、連繋部材110 を有する。前記モータ85が回動するとカム106 が回動し、レバー108 が矢印方向に揺動する。そして操作片99を介して可動メス95が矢印の如く動き、カッタ93による糸の切断がなされる。
・・(中略)・・
次に図1、2に示される如く、ベッド1は前記ルーパアセンブリ21における糸保持手段60の解除機構112 を有する。該機構112 はフレーム本体6にブラケット115 を介して取付けたソレノイド113 によって構成されている。ソレノイド113 のブランジャ114 は、針落位置にあるルーパ4に関連した糸保持手段60の解除片71と対峙する。ソレノイド113 へ通電するとプランジャ114 が突出する。すると解除片71を押して把持片62, 63の間を開く。
・・(中略)・・
次に上記刺繍ミシンの動作を説明する。通常の縫製時においては、針落位置にあるルーパ4は昇降機構32によって図2の如く上昇位置にあり、その従動歯車27は駆動歯車2に噛み合っている。この状態において、主軸17が往復回動され、歯車18, 19、駆動軸14、駆動歯車2、従動歯車27を介してルーパ4が周知の如く往復回動されている。この回動は周知のように縫製用の鉤針11の上下動と同期して行われている。また天板7の上では刺繍枠に張り広げられた布が鉤針11の上下動と同期して間欠的に横移動されている。その結果、ルーパ4の糸通し孔29を通して供給される縫糸120 により針板8上において布に対する縫製が行われている。
・・(中略)・・
次に布における一つの場所での刺繍の縫製を終わって、他の場所に別の刺繍を縫製する場合の動作について図14に基づき説明する。図14に符号201 で示す如く、先ず鉤針11の上下動が停止されると共に、主軸17の回動が停止される。この場合、ルーパ4は図12の(A)に示される如く糸通し孔29が時計の6時の位置に位置する状態で回動が停止する。次に昇降機構32の操作軸39が回動されて、カム40、伝動片41、被動片37を介して昇降体34が下降される。その結果、連繋部材43を介してルーパ軸26が下降され、図9及び図12の(B)の如くルーパ4が引寄片79, 80の進退経路から下方へ退避する(図14の符号202 参照)。また解除機構112 によって把持片62, 63の間が図12の(C)の如く開かれる(図14の符号203 参照)。次に引寄片79, 80が図12の(C)、(D)の如く糸保持手段60の側へ前進し、針孔9とルーパ4における糸通し孔29との間の縫糸120 を一対の把持片62, 63の間及びカッタ93における一対のメス94, 95の間にもたらす(図14の符号204 参照)。次に図13の(E)、(F)の如く把持片62, 63の間が閉じられ、上記縫糸120 が保持される。次に図13の(G)、(H)の如く、可動メス95の作動によって上記の縫糸120 が切断される(図14の符号205 参照)。
・・(中略)・・
上記のように糸の切断が完了すると、次に刺繍枠が横移動されて、布において次の刺繍を縫製する箇所が針孔9の上にもたらされる。この横移動により、上記切断された縫糸のうち布に連なって残っている縫糸は針孔9から抜け出る。次にルーパ4が再び図2の如く上昇される(図14の符号207 参照)。そして鉤針11の上下動が開始される(図14の符号208 参照)と共に、主軸17の回動が開始され、刺繍柄の縫付が開始される。この開始の場合、縫糸の先端は把持片62, 63によって保持されている。従って鉤針11がルーパ4の針落孔28内に下降し、ルーパ4が回動すると、ルーパ4の糸通し孔29を通して供給される糸は鉤針11における鉤部に確実に引掛かる。従って縫糸は布に対ししっかりと引締まった状態で確実に縫い付けられる。尚上記縫糸の先端の保持は、上記縫い始めの縫付が確実となった後、図14の符号209 の如く解除される。・・(後略)・・』
【0004】
上記構成の刺繍ミシンでは、縫製が終わって針孔とルーパとの間にある糸を切断する場合、その側方にある糸切断機構92に向けて糸引寄機構75により糸を引き寄せ、引き寄せ後その糸を切断装置92によってタイミング良く切断できる。
【発明が解決しようとする課題】
しかし上記のような刺繍ミシンでは、メンテナンスの目的でフレーム本体から天板を外して糸切断機構92とその操作機構105との関係や糸引寄機構75とその操作機構83との関係を点検する場合、天板を外して反転させると糸切断機構92と上記操作機構105との連繋や、糸引寄機構75と上記操作機構83との関係は完全に分離されて、相互の連携動作を確認することができず、又糸切断機構92と糸引寄機構75との同期動作関係を確認することもできなくなる問題点があった。更に、メンテナンスを終えて天板7をフレーム本体6に被せ付ける場合には、フレーム本体に対する天板の位置関係と、糸切断機構92をその操作機構105に連繋させることと、糸引寄機構75をその操作機構83に連繋させることとの三つの作業を同時並行的に行わねばならず、その作業に非常に熟達した技術を要する問題点があった。 又上記刺繍ミシンでは、糸引寄機構の駆動系とルーパを上下動させる駆動系とが別である為、相互の同期関係が崩れると、糸の引寄片がルーパにぶつかって糸寄片やその駆動系を破損させたりする危険があるという問題点もあった。
【0005】
本願発明の刺繍ミシンは上記従来技術の問題点(技術的課題)を解決する為に提供するものである。
第1の目的は、縫製が終わって針孔とルーパとの間にある糸を切断する場合、その糸を側方の糸切断機構に向けて引き寄せ、その引き寄せた糸を糸切断機構によって切断することのできる刺繍ミシンを提供することである。
第2の目的は、糸引寄機構の動作と糸切断機構の動作を相互の動作タイミングが良好な状態で、即ち糸を引き寄せることとその引き寄せられた糸を切断することとを適正なタイミング関係で行わすことのできる刺繍ミシンを提供することである。
第3の目的は、往復動を行う一つの部材が作動する過程の内の前期においては上記糸引寄機構を作動させ、後期においては糸切断機構を作動させることによって、上記適正なタイミング関係での動作を簡易な機構でもって達成させることのできる刺繍ミシンを提供することである。
他の目的及び利点は図面及びそれに関連した以下の説明により容易に明らかになるであろう。
【0006】
【課題を解決するための手段】
本願発明における刺繍ミシンは、基枠に対して装着したベッドの上方には、上記ベッドに設けた針孔を通して上下動する鉤針を設け、一方上記針孔の下方にはルーパ4を設け、更に、
上記針孔と上記ルーパ4との間に渡される糸を側方に引き寄せる為の糸引寄機構と、引き寄せられた糸を切断する為の糸切断機構と、
それらの両機構を同期的に駆動するための駆動手段と、
該駆動手段に駆動力を与える為の駆動装置とからなる糸切断装置を上記ベッドの下方に備えさせている刺繍ミシンにおいて、
上記糸引寄機構における糸寄片216は上記ベッドに沿って横動するよう上記基枠に枢着すると共に、
上記糸切断機構における一対の刃94,95の間に対して、上記糸寄片216によりもたらされた糸を切断する為の糸切断機構の可動刃95は上記基枠に枢着し、
上記糸切断機構における一対の刃94,95が位置する場所に対して重合する位置には、上記糸寄片216により一対の刃94,95の間に対してもたらされた糸のルーパ4の側を把持するために開閉自在にしてある一対の把持片62,63を備えさせ、
上記駆動手段は、
上記基枠に対して一方向に向けての往復動が自在でしかも第1と第2の二つの駆動片229,228を間隔を隔てて備えさせた操作部材225と、
上記糸寄片216に連繋させ且つ上記第1の駆動片229との連繋部222を備える第1の連繋レバー221と、
上記可動刃95に連繋させ且つ上記第2の駆動片228との連繋部212を備える第2の連繋レバー211とを備え、
上記第1の連繋レバー221における連繋部222は、折れ曲がり状の溝であって、かつ、操作部材225の往動方向に向かって後方の側に折れ曲がった糸寄片作動の為の作動部224を配し、前方の側には第1の駆動片229の往動方向に向けて直線状になる糸寄片非作動の為の非作動部223を配し、
上記第2の連繋レバー211における連繋部212は、折れ曲がり状の溝であって、かつ、操作部材225の往動方向に向かって前方の側に折れ曲がった可動刃作動用の作動部214を配し、後方の側には往動方向に向けて直線状になる可動刃非作動の為の非作動部213を配し、
操作部材225の第1の駆動片229と第2の駆動片228と、
第1の連繋レバー221における連繋部222の折れ曲がり状の溝と糸寄片非作動の為の非作動部223と、
第2の連繋レバー211における連繋部212の折れ曲がり状の溝と可動刃非作動の為の非作動部213との位置関係は、
上記操作部材225を往動方向に向けて前進させている過程において、
第1の駆動片229が糸寄片作動の為の作動部224の溝内にあって糸寄片216を糸寄位置に向けて作動させている区間にあっては、第2の駆動片228は可動刃非作動の為の非作動部213の内にあって可動刃を作動させることなく直進させる区間に位置するように設定してあり、
糸寄片216を糸寄位置に到来させた後は、僅かな区間において第1の駆動片229と第2の駆動片228とは、夫々糸寄片非作動の為の非作動部223の溝内と、可動刃非作動の為の非作動部213の溝内にあって、上記把持片62,63が、もたらされた糸のルーパ側を把持する間、糸寄片も可動刃も作動させることなく夫々直進させる区間に位置するように設定してあり、
第2の駆動片228が可動刃作動の為の作動部214の溝内にあって可動刃95を糸切断位置に向けて作動させている区間にあっては、第1の駆動片229は糸寄片非作動の為の非作動部223の溝内にあって糸寄片216を作動させることなく直進させる区間に位置するように設定したものである。
【0007】
【作用】
縫製終了後、駆動装置により操作部材が横動される。その往動過程の前期においては、第1の駆動片により第1の連繋レバーが作動されて糸寄片が横動し、針孔とルーパとの間の糸を糸切断機構にもたらす。操作部材の往動過程の後期においては、第2の駆動片により第2の連繋レバーが作動されて可動刃が作動し、糸切断機構にもたらされた糸を切断する。基枠からベッドを除去すると、何れも基枠に備えられている駆動手段と糸引寄機構及び糸切断機構との連動動作関係を目視確認できる。上記動作時において糸寄片が他物に衝突した場合、駆動装置から及ぼされる動きは、遮断機構により糸寄片への伝達が遮断される。
【0008】
【実施例】
以下本願の実施例を示す図面について説明する。図1乃至図9において符号1,3,4,11,60,92で示される部材は、公知(例えば特開平5−239757号公報において公知)の多頭刺繍ミシンにおけるベッド、可動枠、ルーパ、鉤針、糸保持手段、糸切断機構を夫々示すものである。これらの部材の夫々及びそれらと他の部材との関連は、前記公知技術欄に記載された対応各部材の夫々及びそれらと他の部材との関連に係る構成と同様の構成としてある。尚図1乃至図9において、機能上図10〜図14に示されるものと同一又は均等の構成で説明が重複すると考えられる部分には、図10〜図14と同一の符号を付して重複する説明を省略する。又本願においては、基枠とは上記フレーム本体6及びそこに固定的に取付けたベース205とから成る構成を言い、ベッドとは上記天板7及びそこに備わっている針板8等からなる構成を言う。201はフレーム本体6に備えさせたベッド取付部で、ねじ孔をもって構成してあり、そこには上記天板7がボルトによって着脱自在に取付けてある。尚203,204は後述の遮断機構の存置の為にフレーム本体6に形成した凹部及びその取付の為の支承部を夫々示す。
【0009】
次に200は上記基枠に取付けた糸切断装置を示す。205は該装置における種々の機構の取付の為のベースで、一体形成の取付用腕部206をボルト207でフレーム本体6に固定してあり、該ベース205に糸切断装置200における糸切断機構92、糸引寄機構75、それらの駆動手段208が取付けてある。尚209は駆動手段を作動させるための駆動装置、210は駆動装置209と駆動手段208とを結ぶ連動機構を夫々示す。
【0010】
211は糸切断機構92に付設した連繋レバーで、可動刃95と一体形成のものを例示する。212は該レバー211に備えた連繋部として例示する連繋溝で、図示の如く折れ曲がり状に接続した非作動部213と作動部214とを備える。後述の駆動片228による被動部は上記作動部214をもって構成してある。
【0011】
次に糸引寄機構75について説明する。216は糸寄片で、腕部217とその先端部に備えさせた二股状の糸掛部218とを備えしかも硬質材料例えば鋼材で形成してあり、枢着具219例えばビスでもって上記ベース205に枢着してある。221は糸引寄機構75に付設した連繋レバーで、糸寄片216に例えばロウ付け手段によって一体化させたものを例示する。一体形成でもよい。222は該レバー221に備えた連繋部として例示する連繋溝で、図示の如く折れ曲がり状に接続した非作動部223と作動部224とを備える。後述の駆動片229による被動部は上記作動部224をもって構成してある。
【0012】
次に駆動手段208について説明する。該手段208は上記連繋レバー211,221及びそれらの操作の為の以下に述べる往復動自在な操作部材225とから構成される。226は操作部材225における駆動杆で、ガイド部材227によりベース205に対して進退(横動)自在に備えさせてあり、連繋レバー211,221を駆動する為の駆動片例えばピン228,229を取付けてある。230は連動機構210との連繋の為の連繋片で、連繋用の長孔231を備える。
【0013】
次に上記駆動装置209としてはアーム209aが図1の矢印のように往復作動するモータを例示するが、上記操作部材225を進退作動させられるものならば何を用いても良く例えば電動式のアクチュエータ或いはオイル又はエアー式のシリンダなどを用いてもよい。
【0014】
次に234は連動機構210における伝動杆で、一端は上記アーム209aの自由端に、他端は次に述べる遮断機構235を介して連繋片230に連結してある。次に遮断機構235について説明する。該機構は予め定めた所定の大きさの力までの範囲においては入力から出力への動きの伝達を行い、入力にそれ以上の力が加わる場合には、入力から出力への動きの伝達を遮断するようにしたものであり、駆動装置209からの動きを受ける為の入力部材236と、上記操作部材225にその動きを与える為の出力部材237と、前者から後者への動きの伝達及びその遮断を行うためのばね238とから構成してある。
【0015】
240は入力部材236における入力レバーで、元部に固定した軸241によって支承部204に枢着してあり、自由端部には伝動杆234が連結部材242によって枢動可能に連結してある。243はばね238の抜け止め及びばね受けの保持のための部材で、上記軸241に固定してある。244は部材243に取付けたばね受け、245は同じくストッパで、入力部材236と出力部材237との常態における位置関係を一定に保つためのものであり、ばね受け244戸一体に形成してある。次に246は出力部材237における出力レバーで、入力レバー240と枢連結例えば元部に固定したボス247を上記軸241に枢動可能に装着してあり、自由端部には連繋部230との係合片例えば図示の如きピン248が一体に取付けてある。249は上記出力レバー246に備えさせたばね受け、250は上記ストッパ245と同目的のストッパを夫々示す。次に上記ばね238は一例としてねじりコイルばねが用いてあり、ばね保持用の上記ボス247の周囲に配設するとともに、予圧をかけた状態においてその一端238a及び他端238bを上記ばね受244,249に夫々対接させ、その予圧によりストッパ245,250を相互に対接させて入力部材236と出力部材237との位置関係を一定にしてある。
【0016】
次に上記構成の糸切断装置200の動作を図5乃至図7に基づき説明する。ミシンの縫製動作中においては、操作部材225は図5(A)に示される準備位置225a(操作部材225を代表して連繋部230の位置で示す)にあり、カッタ93及び糸寄片216は図示の如き準備位置にある。
【0017】
縫製が終了すると先ずルーパ4を図6の(B)のように下降させるとともに、解除機構112を作動させて糸保持機構の一対の把持片62,63を図6の(A)のように口開きさせ、然る後、駆動装置209を作動させて操作部材225を往動させる。往動過程の前期では、図6の(A)に示す引き寄せ位置225bまで引き寄せ作動範囲251を移動させる。すると駆動手段における第1の駆動片である駆動片229は、連繋溝222の作動部224を介して駆動手段における第1の連繋レバーである連繋レバー221を図示の如く回動させ、糸寄片216が図示の如く回動してルーパ4と針孔9との間の糸120を口開き状態の把持片62,63の間及び刃94,95の間にもたらす。この場合、駆動片228は操作部材225の作動方向と平行となっている非作動部213を動くため、可動刃95は作動しない。
【0018】
次に解除機構112の作動を停止して上記もたらされた糸120を図7の(A)の如く一対の把持片62,63で把持する。次に駆動装置209を更に作動させて操作部材225の往動過程の後期の作動を行わせる。即ち操作部材225を図7の(A)に示す切断位置225cまで切断作動範囲252を移動させる。すると駆動手段における第2の駆動片である駆動片228は、連繋溝212の作動部214を介して駆動手段における第2の連繋レバーである連繋レバー211を図示の如く回動させ、可動刃95は固定刃94と交差して上記の糸120を切断する。この場合、駆動片229は操作部材225の作動方向と平行となっている非作動部223を動くため、糸寄片216は図示の如く糸寄位置に到来した状態を保つ。このように糸寄片216が図示の到来した状態を保つと、当然のことながら、糸寄片216によって刃94,95の間にもたらされた糸120は、到来した状態のままを保つ。
【0019】
上記のようにして糸120を切断した後は、駆動装置209の復動により操作部材225は上記とは反対方向に図5の準備位置まで戻る。その過程で可動刃95及び糸寄片216は上記とは反対の順序で夫々反対の動きを行い、図5の準備位置に戻る。
【0020】
上記の如き糸の切断の過程において他の機構との動作のタイミングが狂う事故が生じた場合を説明する。一例としてルーパ4の下降とのタイミングが狂った場合を示す図8について説明する。ルーパ4の下降が行われる前に駆動装置209の作動が行われると操作部材225の前述の如き作動が行われて糸寄片216は図の如くルーパ4にぶつかってしまう。この場合、上記ぶつかりが起こった後も駆動装置209の作動が引き続き行われて遮断機構235の入力レバー240に加わる力が所定の大きさ以上に大きくなると、図8の(A)の如く入力レバー240の動きに伴ってばね238が変形し、出力レバー246の動きは行われない。これにより、出力レバー246が過度に動くことによる破損事故、例えば出力レバー246、操作部材225、連繋レバー221、糸寄片216等の変形事故の発生が未然に防止される。
【0021】
次に、上記遮断機構235は連繋レバー221と糸寄片216との間に介設してもよい。その場合、上記入力レバー240は上記連繋レバー221によって構成し、出力レバー246は上記糸寄片216によって構成するとよい。
【0022】
次に図9は本願の異なる実施例を示すもので、糸引寄機構75eの糸寄片216eと連繋レバー221eとの間に遮断機構235eを介設するとともに、糸切断機構92eの為にはモータ209と同期作動するそれ専用の駆動装置例えばモータ255を設けて、その駆動アーム255aと連繋レバー211eとを連動杆256で連繋させた例を示すものである。なお、機能上前図のものと同一又は均等の構成で説明が重複すると考えられる部分には、前図と同一の符号にアルファベットのeを付して重複する説明を省略した。
【0023】
【発明の効果】
以上のように本願発明は、糸引寄機構の動作と糸切断機構の動作を相互の動作タイミングが良好な状態で、即ち糸を引き寄せることと、糸寄片216を糸寄位置に到来した状態で保つことと、その引き寄せられた糸が刃94,95の間において、到来した状態が保たれているときに、その停止状態の糸120を切断することとを適正なタイミング関係で行わすことができる。
更に本願発明においては、往復動を行う一つの操作部材226を往動方向に作動する過程の内の前期においては上記糸引寄機構を作動させて、糸120を刃94,95の間に引き寄せ、後期においては、糸寄片216が糸寄位置に到来した状態を保ちながら、糸120が停止している状態において、糸切断機構を作動させるものであるから、上記適正なタイミング関係で糸120の切断動作が出来、このような優れた動作を極めて簡易な操作部材226の往動方向の動作で達成させることができる。
【図面の簡単な説明】
【図1】天板が取り除かれた状態におけるミシンベッドの平面図。
【図2】 糸寄片の斜視図。
【図3】 基枠と糸切断装置との関係を示す縦断面図。
【図4】 (A)は遮断機構の一部破断斜視図、(B)は分解斜視図、(C)は正面図。
【図5】 (A)は糸切断装置が準備状態にある場合の平面図、(B)は同縦断面部分図。
【図6】 (A)は糸切断装置が糸の引き寄せ状態にある場合の平面図、 (B)は同縦断面部分図。
【図7】 (A)は糸切断装置が糸を切断したときの状態を示す平面図、(B)は同縦断面部分図。
【図8】 (A)は糸寄片がルーパに衝突したときの状態を示す平面図、(B)は同縦断面部分図。
【図9】 異なる実施例を示す平面図。
【図10】 天板が取り除かれた状態におけるミシンベッドの平面図。
【図11】 図10におけるII−II線断面図(天板は図示されているが糸切断機構は図の輻輳を避ける為に図示が省略されている)。
【図12】 糸引寄機構及び糸切断機構を示す斜視図。
【図13】 糸引寄機構の為の操作機構及び糸切断機構の為の操作機構の略示図。
【図14】 ルーパが下降した状態を示す図11と同様の断面図。
【符号の説明】
4 ルーパ
7 ベッド
11 鉤針
75 糸引寄機構
92 糸切断機構
200 糸切断装置
208 駆動手段
216 糸寄片
[0001]
[Industrial application fields]
The present invention relates to an embroidery sewing machine used for embroidering a cloth. More specifically, the present invention relates to an apparatus for cutting a sewing thread that has finished embroidery sewing on a cloth in the embroidery sewing machine.
[0002]
[Prior art]
Technical matters relating to this type of embroidery sewing machine are disclosed in, for example, Japanese Patent Application Laid-Open No. 5-239757. The contents of the publication are as described in the following “Known Art” column. 1, 2, 5, 7, and 9 in the above publication are shown in order as FIGS. 10 to 14 in order to distinguish them from FIGS. 1 to 9 showing the embodiment of the present application in the attached drawings.
[0003]
FIG. 1 and FIG. 2 show one bed 1 in a multi-head embroidery sewing machine. A plurality of such beds 1 are arranged in the left-right direction in FIG. A sewing head is provided above each bed 1. In FIG. 2, reference numeral 11 denotes a sewing needle which can be moved up and down and is provided in the sewing machine head. The bed 1 is provided with a plurality of loopers 4, a drive gear 2 for selectively driving the loopers 4, and various mechanisms described below.
・ ・ (Omitted) ・ ・
A bed frame 1a in the bed 1 includes a frame main body 6 attached to a sewing machine frame 5 in a multi-head embroidery sewing machine, and a top plate 7 placed on the main body 6. A needle plate 8 is attached to the top plate 7 as is well known. The needle plate 8 has a needle hole 9 and a thread pulling hole 10.
・ ・ (Omitted) ・ ・
Next, the drive gear 2 and the mechanism related thereto will be described. As shown in FIGS. 1 and 2, a support bracket 13 is fixed to the frame body 6, and a drive gear 2 is attached to an upper end of a vertical drive shaft 14 that is rotatably mounted on the bracket 13.・ ・ (Omitted) ・ ・
The plurality of loopers 4 are provided as one component of the looper assembly 21 shown in FIGS. The looper assembly 21 has a movable frame 3. A rail 22 is attached to the frame body 6, and a slide body 23 that is movable on the rail 22 is attached to the movable frame 3. As a result, the movable frame 3 is linear with respect to the frame body 6 in the left-right direction in FIG. Can move sideways.・ ・ (Omitted) ・ ・
As shown in FIG. 1, the looper assembly 21 has thread holding means 60 provided individually for each looper 4. Each thread holding means 60 has a pair of gripping pieces 62 and 63 as shown in FIG. The gripping piece 62 is attached to a base 61 fixed to the movable frame 3. The gripping piece 63 is pivotally attached to the gripping piece 62 by a pin 64 and grips the thread between the gripping piece 62.・ ・ (Omitted) ・ ・
Next, the bed 1 is provided with an elevating mechanism 32 for changing the position of the looper 4 in the needle drop position in the axial direction as shown in FIGS.・ ・ (Omitted) ・ ・
Next, as shown in FIGS. 2, 5, and 12, the bed 1 has a thread drawing mechanism 75. The mechanism 75 is for pulling the thread between the needle hole 9 and the looper 4 at the needle drop position to the position of the thread holding means 60 related to the looper 4. Guides 76 and 77 are attached to the lower surface of the top plate 7. The slider 78 is guided by the guides 76 and 77 and can advance and retreat. On the slider 78, an upper attracting piece 79 and a lower attracting piece 80 are integrally formed. As shown in FIGS. 12B and 12D, the upper attracting piece 79 is movable toward the upper position of the gripping pieces 62, 63, and the lower attracting piece 80 is moved to the gripping piece 62, 63. 63 can be moved to a lower position. These attracting pieces 79, 80 have depressions 79a, 80a for drawing the yarn without causing lateral displacement. The slider 78 is provided with a piece 81 linked to the operation mechanism.
・ ・ (Omitted) ・ ・
FIG. 7 shows an operation mechanism 83 for the yarn pulling mechanism 75. A horizontal operation shaft 84 is provided so as to pass through a large number of beds 1, and an operation motor 85 is connected to one end thereof. In each bed 1, a cam 86 is attached to the operation shaft 84. The lever 88 is pivotally attached to the frame body 6 at one end thereof. A follower 89 provided in the middle of the lever 88 is engaged with the cam groove 87 of the cam 86. A connecting member 90 provided at the other end of the lever 88 is engaged with the connecting piece 81. When the motor 85 rotates, the cam 86 rotates and the lever 88 swings in the direction of the arrow. As a result, the slider 78 and the attracting pieces 79 and 80 move back and forth in the direction of the arrow.
・ ・ (Omitted) ・ ・
Next, as shown in FIG. 12B, a space 91 for cutting the sewing thread is provided on the upper side of the thread holding means 60, and the space 91 has a thread cutting mechanism 92 as shown in FIG. Is equipped. A cutter 93 composed of a pair of scalpels 94, 95 is provided on the upper side of the thread holding means 60 associated with the looper 4 at the needle drop position. The knife 94 is fixed to the lower surface of the top plate 7, and the knife 95 is pivotally attached to the knife 94 by a pin 96. A pair of guides 97 and 98 are attached to the lower surface of the top plate 7. The operation piece 99 is guided by the guides 97 and 98 and can be moved back and forth. The operation piece 99 has an engagement piece 100 at one end, which is engaged with a long hole 101 formed in the moving knife 95. The operation piece 99 has a connecting piece 102 with an operation mechanism at the other end.
・ ・ (Omitted) ・ ・
FIG. 7 shows an operation mechanism 105 for the yarn cutting mechanism 92. The operation mechanism 105 has the same configuration as the operation mechanism 83 for the yarn pulling mechanism 75, and includes a cam 106, a cam groove 107, a lever 108, a follower 109, and a connecting member 110. When the motor 85 rotates, the cam 106 rotates and the lever 108 swings in the direction of the arrow. Then, the movable knife 95 moves as shown by an arrow through the operation piece 99, and the yarn is cut by the cutter 93.
・ ・ (Omitted) ・ ・
Next, as shown in FIGS. 1 and 2, the bed 1 has a release mechanism 112 for the thread holding means 60 in the looper assembly 21. The mechanism 112 is constituted by a solenoid 113 attached to the frame body 6 via a bracket 115. The flanger 114 of the solenoid 113 faces the release piece 71 of the thread holding means 60 associated with the looper 4 at the needle drop position. When the solenoid 113 is energized, the plunger 114 protrudes. Then, the release piece 71 is pushed to open the gap between the grip pieces 62 and 63.
・ ・ (Omitted) ・ ・
Next, the operation of the embroidery sewing machine will be described. During normal sewing, the looper 4 in the needle drop position is in the raised position as shown in FIG. 2 by the lifting mechanism 32, and the driven gear 27 meshes with the drive gear 2. In this state, the main shaft 17 is reciprocally rotated, and the looper 4 is reciprocally rotated through the gears 18 and 19, the drive shaft 14, the drive gear 2 and the driven gear 27 as is well known. This rotation is performed in synchronism with the vertical movement of the sewing needle 11 as is well known. On the top plate 7, the cloth stretched around the embroidery frame is intermittently moved laterally in synchronism with the vertical movement of the heel needle 11. As a result, the cloth is sewn on the needle plate 8 by the sewing thread 120 supplied through the threading hole 29 of the looper 4.
・ ・ (Omitted) ・ ・
Next, the operation when the embroidery is sewn at one place on the cloth and another embroidery is sewn at another place will be described with reference to FIG. As indicated by reference numeral 201 in FIG. 14, first, the vertical movement of the needle 11 is stopped and the rotation of the main shaft 17 is stopped. In this case, the looper 4 stops rotating with the threading hole 29 positioned at the 6 o'clock position of the watch as shown in FIG. Next, the operating shaft 39 of the elevating mechanism 32 is rotated, and the elevating body 34 is lowered via the cam 40, the transmission piece 41, and the driven piece 37. As a result, the looper shaft 26 is lowered via the connecting member 43, and the looper 4 is retracted downward from the advancing and retracting paths of the attracting pieces 79 and 80 as shown in FIGS. 9 and 12 (reference numeral 202 in FIG. 14). reference). Further, the gripping pieces 62 and 63 are opened as shown in FIG. 12C by the release mechanism 112 (see reference numeral 203 in FIG. 14). Next, the attracting pieces 79 and 80 are advanced toward the thread holding means 60 as shown in FIGS. 12C and 12D, and a pair of sewing threads 120 between the needle hole 9 and the threading hole 29 in the looper 4 are provided. Between the grip pieces 62 and 63 and between the pair of knives 94 and 95 in the cutter 93 (see reference numeral 204 in FIG. 14). Next, as shown in FIGS. 13E and 13F, the gap between the gripping pieces 62 and 63 is closed, and the sewing thread 120 is held. Next, as shown in FIGS. 13G and 13H, the sewing thread 120 is cut by the operation of the movable knife 95 (see reference numeral 205 in FIG. 14).
・ ・ (Omitted) ・ ・
When the cutting of the thread is completed as described above, the embroidery frame is then moved laterally, and a place for sewing the next embroidery on the cloth is provided on the needle hole 9. As a result of this lateral movement, the suture thread remaining after the cloth out of the cut sewing thread comes out of the needle hole 9. Next, the looper 4 is raised again as shown in FIG. 2 (see reference numeral 207 in FIG. 14). Then, the vertical movement of the eyelid needle 11 is started (see reference numeral 208 in FIG. 14), and the rotation of the main shaft 17 is started, and sewing of the embroidery pattern is started. In the case of this start, the leading end of the sewing thread is held by the gripping pieces 62 and 63. Therefore, when the needle 11 is lowered into the needle drop hole 28 of the looper 4 and the looper 4 is rotated, the thread supplied through the threading hole 29 of the looper 4 is reliably caught on the hook portion of the needle 11. Therefore, the sewing thread can be securely sewn in a state where the sewing thread is firmly tightened against the cloth. The holding of the tip of the sewing thread is released as indicated by reference numeral 209 in FIG. 14 after the sewing at the start of the sewing is ensured.・ ・ (Omitted) ・ ・ 」
[0004]
In the embroidery sewing machine having the above configuration, when sewing is finished and the thread between the needle hole and the looper is cut, the thread is drawn by the thread pulling mechanism 75 toward the thread cutting mechanism 92 on the side thereof, and after the drawing, the thread is pulled. The yarn can be cut by the cutting device 92 with good timing.
[Problems to be solved by the invention]
However, in the above embroidery sewing machine, when the top plate is removed from the frame body for the purpose of maintenance, the relationship between the thread cutting mechanism 92 and its operation mechanism 105 and the relationship between the thread drawing mechanism 75 and its operation mechanism 83 are checked. When the top plate is removed and reversed, the linkage between the yarn cutting mechanism 92 and the operation mechanism 105 and the relationship between the yarn pulling mechanism 75 and the operation mechanism 83 are completely separated, and the mutual cooperation operation is confirmed. There is a problem that it is impossible to check the synchronous operation relationship between the yarn cutting mechanism 92 and the yarn drawing mechanism 75. Further, when the top plate 7 is put on the frame main body 6 after the maintenance is completed, the positional relationship of the top plate with respect to the frame main body, the thread cutting mechanism 92 is linked to the operation mechanism 105, and the thread drawing mechanism 75 is provided. The three operations of linking to the operation mechanism 83 must be performed in parallel, and there is a problem that requires highly skilled techniques for the operation. In the above embroidery sewing machine, the drive system for the thread pulling mechanism and the drive system for moving the looper up and down are separate, so if the mutual synchronization relationship is lost, the thread pulling piece hits the looper and There was also a problem that the drive system could be damaged.
[0005]
The embroidery sewing machine of the present invention is provided to solve the above-mentioned problems (technical problems) of the prior art.
The first purpose is to sew the thread between the needle hole and the looper after the sewing is finished, draw the thread toward the side thread cutting mechanism, and cut the pulled thread by the thread cutting mechanism. It is to provide an embroidery sewing machine that can handle.
The second purpose is that the operation of the yarn pulling mechanism and the operation of the yarn cutting mechanism are in a state where the mutual operation timing is good, that is, the drawing of the yarn and the cutting of the drawn yarn are in an appropriate timing relationship. It is to provide an embroidery sewing machine that can be performed.
The third object is to operate the yarn pulling mechanism in the first half of the process in which one member that performs reciprocating motion operates, and to operate the yarn cutting mechanism in the second half so that the proper timing relationship is achieved. It is an object to provide an embroidery sewing machine that can achieve an operation with a simple mechanism.
Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.
[0006]
[Means for Solving the Problems]
The embroidery sewing machine according to the present invention is provided with a hook needle that moves up and down through a needle hole provided in the bed above the bed attached to the base frame, while a looper 4 is provided below the needle hole,
A yarn pulling mechanism for drawing the yarn passed between the needle hole and the looper 4 to the side, a yarn cutting mechanism for cutting the drawn yarn,
Driving means for driving both of these mechanisms synchronously;
In an embroidery sewing machine provided with a yarn cutting device comprising a driving device for applying a driving force to the driving means below the bed,
The yarn holder 216 in the yarn pulling mechanism is pivotally attached to the base frame so as to move laterally along the bed,
Between the pair of blades 94, 95 in the yarn cutting mechanism, the movable blade 95 of the yarn cutting mechanism for cutting the yarn provided by the yarn offset piece 216 is pivotally attached to the base frame,
In the position where the pair of blades 94 and 95 are positioned in the thread cutting mechanism, the thread looper 4 brought between the pair of blades 94 and 95 by the thread offset piece 216 is placed. A pair of gripping pieces 62 and 63 that are openable and closable to grip the side,
The drive means is
An operating member 225 that is freely reciprocable in one direction with respect to the base frame and that includes first and second drive pieces 229 and 228 spaced apart from each other;
A first connecting lever 221 that is connected to the yarn piece 216 and includes a connecting part 222 to the first drive piece 229;
A second connecting lever 211 connected to the movable blade 95 and provided with a connecting part 212 to the second driving piece 228;
The connecting portion 222 of the first connecting lever 221 is a bent groove and includes an operation portion 224 for operating the yarn offset piece that is bent toward the rear side in the forward movement direction of the operation member 225. Arranged on the front side is a non-actuating portion 223 for non-actuating the thread piece that is linear in the forward direction of the first drive piece 229,
The connecting portion 212 in the second connecting lever 211 is a bent groove and is provided with an operating portion 214 for operating the movable blade that is bent forward in the forward movement direction of the operating member 225. The non-operating part 213 for non-operating the movable blade that is linear in the forward direction is arranged on the rear side,
A first drive piece 229 and a second drive piece 228 of the operating member 225;
A bent groove of the connecting portion 222 in the first connecting lever 221 and a non-actuating portion 223 for non-actuating the yarn offset piece;
The positional relationship between the bent groove of the connecting part 212 in the second connecting lever 211 and the non-operating part 213 for non-operation of the movable blade is as follows:
In the process of moving the operating member 225 forward in the forward direction,
In the section where the first drive piece 229 is in the groove of the operating portion 224 for the yarn piece operation and the yarn piece 216 is operated toward the yarn position, the second drive piece 228 is It is set in the non-actuating part 213 for non-operation of the movable blade so as to be positioned in a section where the movable blade is moved straight without operating,
After the yarn offset piece 216 has arrived at the yarn offset position, the first drive piece 229 and the second drive piece 228 in a small section are respectively grooves in the non-actuating portion 223 for non-operation of the yarn offset piece. And in the groove of the non-actuating part 213 for non-operation of the movable blade, and while the gripping pieces 62 and 63 grip the looper side of the brought yarn, both the yarn offset piece and the movable blade are operated. It is set to be located in each section that goes straight without
In the section where the second drive piece 228 is in the groove of the actuating portion 214 for operating the movable blade and the movable blade 95 is operated toward the yarn cutting position, the first drive piece 229 is used as the yarn support. It is set so as to be positioned in a section in which the yarn collateral piece 216 is moved straight without being actuated, in the groove of the non-actuating part 223 for inoperative part.
[0007]
[Action]
After the end of sewing, the operating member is laterally moved by the driving device. In the first half of the forward movement process, the first connecting lever is actuated by the first driving piece to cause the yarn colliding piece to move laterally and bring the yarn between the needle hole and the looper to the yarn cutting mechanism. In the latter stage of the forward movement process of the operation member, the second connecting lever is operated by the second drive piece, the movable blade is operated, and the yarn brought to the yarn cutting mechanism is cut. When the bed is removed from the base frame, it is possible to visually confirm the interlocking operation relationship between the driving means provided in the base frame, the yarn drawing mechanism, and the yarn cutting mechanism. When the yarn piece collides with another object during the above operation, the movement exerted from the driving device is blocked from being transmitted to the yarn piece by the blocking mechanism.
[0008]
【Example】
Hereinafter, drawings showing examples of the present application will be described. 1 to 9, the members denoted by reference numerals 1, 3, 4, 11, 60, and 92 are beds, movable frames, loopers, and needles in a known multi-head embroidery sewing machine (for example, disclosed in JP-A-5-239757). , A thread holding means and a thread cutting mechanism, respectively. Each of these members and the relationship between these members and other members are the same as the configuration related to each of the corresponding members described in the above-mentioned known technology column and the relationship between them and other members. 1 to 9, functionally the same or equivalent components as those shown in FIGS. 10 to 14 are duplicated by giving the same reference numerals as in FIGS. Description to be omitted is omitted. In the present application, the base frame refers to a configuration including the frame main body 6 and a base 205 fixedly attached thereto, and the bed includes the top plate 7 and a needle plate 8 provided therein. Say. Reference numeral 201 denotes a bed mounting portion provided in the frame main body 6, which has a screw hole, and the top plate 7 is detachably mounted by bolts. Reference numerals 203 and 204 denote a recess formed in the frame main body 6 for the purpose of providing a blocking mechanism, which will be described later, and a support portion for mounting the recess.
[0009]
Reference numeral 200 denotes a yarn cutting device attached to the base frame. Reference numeral 205 denotes a base for mounting various mechanisms in the apparatus, and an integrally formed mounting arm 206 is fixed to the frame body 6 with bolts 207. The thread cutting mechanism 92 in the thread cutting apparatus 200 is attached to the base 205. , The yarn pulling mechanism 75 and their driving means 208 are attached. Reference numeral 209 denotes a driving device for operating the driving means, and 210 denotes an interlocking mechanism for connecting the driving device 209 and the driving means 208, respectively.
[0010]
211 is a connecting lever attached to the thread cutting mechanism 92, and is an example of one integrally formed with the movable blade 95. 212 is a connecting groove exemplified as a connecting portion provided in the lever 211, and includes a non-operating portion 213 and an operating portion 214 connected in a bent manner as shown in the figure. A driven portion by a driving piece 228 described later is configured by the operating portion 214.
[0011]
Next, the yarn drawing mechanism 75 will be described. Reference numeral 216 denotes a yarn offset piece, which includes an arm portion 217 and a bifurcated thread hook portion 218 provided at the tip thereof, and is formed of a hard material such as steel, and the base 205 with a pivot attachment 219 such as a screw. It is pivotally attached to. Reference numeral 221 denotes a connecting lever attached to the yarn pulling mechanism 75, which is integrated with the yarn picking piece 216 by, for example, brazing means. It may be integrally formed. Reference numeral 222 denotes a connecting groove exemplified as a connecting part provided in the lever 221, and includes a non-actuating part 223 and an actuating part 224 connected in a bent shape as shown in the figure. A driven part by a driving piece 229 described later is constituted by the operating part 224.
[0012]
Next, the driving means 208 will be described. The means 208 is composed of the connecting levers 211 and 221 and a reciprocating operation member 225 described below for operating them. Reference numeral 226 denotes a drive rod in the operation member 225, which is provided so as to be able to advance and retreat (laterally move) with respect to the base 205 by a guide member 227. 230 is a connecting piece for connecting with the interlocking mechanism 210, and includes a long hole 231 for connection.
[0013]
Next, as the drive device 209, a motor in which the arm 209a reciprocates as shown by the arrow in FIG. 1 is exemplified. Any device can be used as long as the operation member 225 can be moved back and forth, for example, an electric actuator. Alternatively, an oil or air type cylinder may be used.
[0014]
Next, reference numeral 234 denotes a transmission rod in the interlocking mechanism 210. One end is connected to the free end of the arm 209a, and the other end is connected to the connecting piece 230 via a blocking mechanism 235 described below. Next, the blocking mechanism 235 will be described. The mechanism transmits the movement from the input to the output in the range up to a predetermined force, and when the force is applied to the input, the transmission of the movement from the input to the output is cut off. An input member 236 for receiving movement from the drive device 209, an output member 237 for giving movement to the operation member 225, and transmission of the movement from the former to the latter and blocking thereof And a spring 238 for performing the above.
[0015]
An input lever 240 in the input member 236 is pivotally attached to the support portion 204 by a shaft 241 fixed to the base portion, and a transmission rod 234 is pivotally connected to the free end portion by a connecting member 242. Reference numeral 243 denotes a member for preventing the spring 238 from coming off and holding the spring receiver, and is fixed to the shaft 241. 244 is a spring receiver attached to the member 243, and 245 is also a stopper for keeping the positional relationship between the input member 236 and the output member 237 in a normal state, and is formed integrally with the spring receiver 244 door. Next, reference numeral 246 denotes an output lever in the output member 237, which is pivotally connected to the input lever 240, for example, a boss 247 fixed to the base portion so as to be pivotable on the shaft 241. An engaging piece, for example, a pin 248 as shown is integrally attached. Reference numeral 249 denotes a spring receiver provided on the output lever 246, and 250 denotes a stopper having the same purpose as the stopper 245. Next, the spring 238 is, for example, a torsion coil spring. The spring 238 is disposed around the boss 247 for holding the spring. The stoppers 245 and 250 are brought into contact with each other by the preload, and the positional relationship between the input member 236 and the output member 237 is made constant.
[0016]
Next, the operation of the yarn cutting device 200 configured as described above will be described with reference to FIGS. During the sewing operation of the sewing machine, the operation member 225 is at the preparation position 225a shown in FIG. 5A (represented by the position of the connecting portion 230 as a representative of the operation member 225), and the cutter 93 and the yarn offset piece 216 are It is in the ready position as shown.
[0017]
When the sewing is finished, the looper 4 is first lowered as shown in FIG. 6B, and the release mechanism 112 is operated so that the pair of gripping pieces 62 and 63 of the thread holding mechanism are opened as shown in FIG. After that, the drive device 209 is operated to move the operation member 225 forward. In the first half of the forward movement process, the pulling operation range 251 is moved to the pulling position 225b shown in FIG. Then, the driving piece 229 which is the first driving piece in the driving means rotates the connecting lever 221 which is the first connecting lever in the driving means via the operating portion 224 of the connecting groove 222 as shown in the figure, and the yarn offset piece. 216 rotates as shown to bring the thread 120 between the looper 4 and the needle hole 9 between the gripping pieces 62, 63 and the blades 94, 95 in the open state. In this case, since the drive piece 228 moves on the non-operation part 213 parallel to the operation direction of the operation member 225, the movable blade 95 does not operate.
[0018]
Next, the operation of the release mechanism 112 is stopped, and the resulting thread 120 is gripped by a pair of gripping pieces 62 and 63 as shown in FIG. Next, the drive device 209 is further operated to perform the later operation of the operation member 225 in the forward movement process. That is, the operating range 252 is moved to the cutting position 225c shown in FIG. Then, the driving piece 228 which is the second driving piece in the driving means rotates the connecting lever 211 which is the second connecting lever in the driving means via the actuating portion 214 of the connecting groove 212 as shown in the figure. Cuts the thread 120 by crossing the fixed blade 94. In this case, since the drive piece 229 moves on the non-actuating portion 223 that is parallel to the operation direction of the operation member 225, the yarn offset piece 216 keeps the yarn offset position as shown in the figure. If the yarn piece 216 is kept in the illustrated state in this manner, the yarn 120 brought between the blades 94 and 95 by the yarn piece 216 is naturally kept in the arrived state.
[0019]
After the thread 120 is cut as described above, the operating member 225 returns to the preparation position in FIG. In the process, the movable blade 95 and the yarn offset piece 216 move in the opposite order, and return to the preparation position in FIG.
[0020]
A case will be described where an accident occurs in which the timing of operation with another mechanism is out of order in the process of cutting the yarn as described above. As an example, FIG. 8 illustrating a case where the timing of the lowering of the looper 4 is incorrect will be described. If the driving device 209 is actuated before the looper 4 is lowered, the operation member 225 is actuated as described above, and the yarn offset piece 216 hits the looper 4 as shown in the figure. In this case, when the operation of the drive device 209 continues even after the collision occurs, and the force applied to the input lever 240 of the blocking mechanism 235 becomes larger than a predetermined magnitude, the input lever as shown in FIG. The spring 238 is deformed with the movement of 240, and the movement of the output lever 246 is not performed. Thus, damage accidents due to excessive movement of the output lever 246, for example, deformation accidents of the output lever 246, the operation member 225, the connecting lever 221, the yarn offset piece 216, etc., can be prevented.
[0021]
Next, the blocking mechanism 235 may be interposed between the connecting lever 221 and the yarn offset piece 216. In that case, the input lever 240 may be constituted by the connecting lever 221, and the output lever 246 may be constituted by the yarn offset piece 216.
[0022]
Next, FIG. 9 shows a different embodiment of the present application, in which a blocking mechanism 235e is interposed between the yarn cutting piece 216e of the yarn drawing mechanism 75e and the connecting lever 221e, and a motor for the yarn cutting mechanism 92e. An example in which a dedicated drive device, for example, a motor 255, which operates in synchronization with 209 is provided, and the drive arm 255a and the connecting lever 211e are connected by an interlocking rod 256 is shown. In addition, the part which is considered functionally the same or equivalent to the thing of the previous figure, and overlaps description is attached | subjected to the code | symbol same as the previous figure, and the overlapping description is abbreviate | omitted.
[0023]
【The invention's effect】
As described above, in the present invention, the operation of the yarn attracting mechanism and the operation of the yarn cutting mechanism are in a state where the mutual operation timing is good, that is, in the state where the yarn is attracted and the yarn offset piece 216 arrives at the yarn offset position. Keeping the pulled yarn 120 between the blades 94, 95 and cutting the stopped yarn 120 in an appropriate timing relationship. it can.
Further, in the present invention, in the first half of the process of operating one operating member 226 that performs reciprocating motion in the forward movement direction, the yarn pulling mechanism is operated to draw the yarn 120 between the blades 94 and 95, In the latter period, the yarn cutting mechanism is operated in a state where the yarn 120 is stopped while maintaining the state where the yarn offset piece 216 has arrived at the yarn offset position. The cutting operation can be performed, and such an excellent operation can be achieved by the operation of the operation member 226 in the forward movement direction.
[Brief description of the drawings]
FIG. 1 is a plan view of a sewing machine bed with a top plate removed.
FIG. 2 is a perspective view of a thread piece.
FIG. 3 is a longitudinal sectional view showing a relationship between a base frame and a yarn cutting device.
4A is a partially broken perspective view of a blocking mechanism, FIG. 4B is an exploded perspective view, and FIG. 4C is a front view.
5A is a plan view when the yarn cutting device is in a preparation state, and FIG. 5B is a partial longitudinal sectional view thereof.
6A is a plan view when the yarn cutting device is in a state of drawing a yarn, and FIG. 6B is a partial longitudinal sectional view thereof.
7A is a plan view showing a state when the yarn cutting device cuts the yarn, and FIG. 7B is a longitudinal sectional partial view thereof.
FIG. 8A is a plan view showing a state when the yarn piece collides with the looper, and FIG. 8B is a partial longitudinal sectional view thereof.
FIG. 9 is a plan view showing a different embodiment.
FIG. 10 is a plan view of the sewing machine bed with the top plate removed.
11 is a cross-sectional view taken along line II-II in FIG. 10 (the top plate is shown, but the yarn cutting mechanism is not shown in order to avoid congestion in the drawing).
FIG. 12 is a perspective view showing a yarn drawing mechanism and a yarn cutting mechanism.
FIG. 13 is a schematic diagram of an operation mechanism for a yarn pulling mechanism and an operation mechanism for a yarn cutting mechanism.
14 is a cross-sectional view similar to FIG. 11, showing a state where the looper is lowered.
[Explanation of symbols]
4 loopers 7 beds
11 Acupuncture needle
75 Thread drawing mechanism
92 Thread cutting mechanism
200 Thread cutting device
208 Drive means
216 Itoise

Claims (1)

基枠に対して装着したベッドの上方には、上記ベッドに設けた針孔を通して上下動する鉤針を設け、一方上記針孔の下方にはルーパ4を設け、更に、
上記針孔と上記ルーパ4との間に渡される糸を側方に引き寄せる為の糸引寄機構と、引き寄せられた糸を切断する為の糸切断機構と、
それらの両機構を同期的に駆動するための駆動手段と、
該駆動手段に駆動力を与える為の駆動装置とからなる糸切断装置を上記ベッドの下方に備えさせている刺繍ミシンにおいて、
上記糸引寄機構における糸寄片216は上記ベッドに沿って横動するよう上記基枠に枢着すると共に、
上記糸切断機構における一対の刃94,95の間に対して、上記糸寄片216によりもたらされた糸を切断する為の糸切断機構の可動刃95は上記基枠に枢着し、
上記糸切断機構における一対の刃94,95が位置する場所に対して重合する位置には、上記糸寄片216により一対の刃94,95の間に対してもたらされた糸のルーパ4の側を把持するために開閉自在にしてある一対の把持片62,63を備えさせ、
上記駆動手段は、
上記基枠に対して一方向に向けての往復動が自在でしかも第1と第2の二つの駆動片229,228を間隔を隔てて備えさせた操作部材225と、
上記糸寄片216に連繋させ且つ上記第1の駆動片229との連繋部222を備える第1の連繋レバー221と、
上記可動刃95に連繋させ且つ上記第2の駆動片228との連繋部212を備える第2の連繋レバー211とを備え、
上記第1の連繋レバー221における連繋部222は、折れ曲がり状の溝であって、かつ、操作部材225の往動方向に向かって後方の側に折れ曲がった糸寄片作動の為の作動部224を配し、前方の側には第1の駆動片229の往動方向に向けて直線状になる糸寄片非作動の為の非作動部223を配し、
上記第2の連繋レバー211における連繋部212は、折れ曲がり状の溝であって、かつ、操作部材225の往動方向に向かって前方の側に折れ曲がった可動刃作動用の作動部214を配し、後方の側には往動方向に向けて直線状になる可動刃非作動の為の非作動部213を配し、
操作部材225の第1の駆動片229と第2の駆動片228と、
第1の連繋レバー221における連繋部222の折れ曲がり状の溝と糸寄片非作動の為の非作動部223と、
第2の連繋レバー211における連繋部212の折れ曲がり状の溝と可動刃非作動の為の非作動部213との位置関係は、
上記操作部材225を往動方向に向けて前進させている過程において、
第1の駆動片229が糸寄片作動の為の作動部224の溝内にあって糸寄片216を糸寄位置に向けて作動させている区間にあっては、第2の駆動片228は可動刃非作動の為の非作動部213の内にあって可動刃を作動させることなく直進させる区間に位置するように設定してあり、
糸寄片216を糸寄位置に到来させた後は、僅かな区間において第1の駆動片229と第2の駆動片228とは、夫々糸寄片非作動の為の非作動部223の溝内と、可動刃非作動の為の非作動部213の溝内にあって、上記把持片62,63が、もたらされた糸のルーパ側を把持する間、糸寄片も可動刃も作動させることなく夫々直進させる区間に位置するように設定してあり、
第2の駆動片228が可動刃作動の為の作動部214の溝内にあって可動刃95を糸切断位置に向けて作動させている区間にあっては、第1の駆動片229は糸寄片非作動の為の非作動部223の溝内にあって糸寄片216を作動させることなく直進させる区間に位置するように設定してあることを特徴とする刺繍ミシン。
Above the bed attached to the base frame is provided a gourd needle that moves up and down through a needle hole provided in the bed, while a looper 4 is provided below the needle hole,
A yarn pulling mechanism for drawing the yarn passed between the needle hole and the looper 4 to the side, a yarn cutting mechanism for cutting the drawn yarn,
Driving means for driving both of these mechanisms synchronously;
In an embroidery sewing machine provided with a yarn cutting device comprising a driving device for applying a driving force to the driving means below the bed,
The yarn holder 216 in the yarn pulling mechanism is pivotally attached to the base frame so as to move laterally along the bed,
Between the pair of blades 94, 95 in the yarn cutting mechanism, the movable blade 95 of the yarn cutting mechanism for cutting the yarn provided by the yarn offset piece 216 is pivotally attached to the base frame,
In the position where the pair of blades 94 and 95 are positioned in the thread cutting mechanism, the thread looper 4 brought between the pair of blades 94 and 95 by the thread offset piece 216 is placed. A pair of gripping pieces 62 and 63 that are openable and closable to grip the side,
The drive means is
An operating member 225 that is freely reciprocable in one direction with respect to the base frame and that includes first and second drive pieces 229 and 228 spaced apart from each other;
A first connecting lever 221 that is connected to the yarn piece 216 and includes a connecting part 222 to the first drive piece 229;
A second connecting lever 211 connected to the movable blade 95 and provided with a connecting part 212 to the second driving piece 228;
The connecting portion 222 of the first connecting lever 221 is a bent groove and includes an operation portion 224 for operating the yarn offset piece that is bent toward the rear side in the forward movement direction of the operation member 225. Arranged on the front side is a non-actuating portion 223 for non-actuating the thread piece that is linear in the forward direction of the first drive piece 229,
The connecting portion 212 in the second connecting lever 211 is a bent groove and is provided with an operating portion 214 for operating the movable blade that is bent forward in the forward movement direction of the operating member 225. The non-operating part 213 for non-operating the movable blade that is linear in the forward direction is arranged on the rear side,
A first drive piece 229 and a second drive piece 228 of the operating member 225;
A bent groove of the connecting portion 222 in the first connecting lever 221 and a non-actuating portion 223 for non-actuating the yarn offset piece;
The positional relationship between the bent groove of the connecting part 212 in the second connecting lever 211 and the non-operating part 213 for non-operation of the movable blade is as follows:
In the process of moving the operating member 225 forward in the forward direction,
In the section where the first drive piece 229 is in the groove of the operating portion 224 for the yarn piece operation and the yarn piece 216 is operated toward the yarn position, the second drive piece 228 is It is set in the non-actuating part 213 for non-operation of the movable blade so as to be positioned in a section where the movable blade is moved straight without operating,
After the yarn offset piece 216 has arrived at the yarn offset position, the first drive piece 229 and the second drive piece 228 in a small section are respectively grooves in the non-actuating portion 223 for non-operation of the yarn offset piece. And in the groove of the non-actuating part 213 for non-operation of the movable blade, and while the gripping pieces 62 and 63 grip the looper side of the brought yarn, both the yarn offset piece and the movable blade are operated. It is set to be located in each section that goes straight without
In the section where the second drive piece 228 is in the groove of the actuating portion 214 for operating the movable blade and the movable blade 95 is operated toward the yarn cutting position, the first drive piece 229 is used as the yarn support. An embroidery sewing machine set in a groove of a non-actuating portion 223 for non-actuating so as to be positioned in a section in which the threaded-off piece 216 moves straight without being actuated.
JP09563594A 1994-04-09 1994-04-09 Embroidery sewing machine Expired - Fee Related JP3775437B2 (en)

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