JP2004243001A - Bobbin thread feeder for sewing machine and rotary hook member used therein - Google Patents

Bobbin thread feeder for sewing machine and rotary hook member used therein Download PDF

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Publication number
JP2004243001A
JP2004243001A JP2003037942A JP2003037942A JP2004243001A JP 2004243001 A JP2004243001 A JP 2004243001A JP 2003037942 A JP2003037942 A JP 2003037942A JP 2003037942 A JP2003037942 A JP 2003037942A JP 2004243001 A JP2004243001 A JP 2004243001A
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Japan
Prior art keywords
lower thread
sewing machine
thread
shuttle
hook
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JP2003037942A
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Japanese (ja)
Inventor
Toshio Miyamoto
敏男 宮本
Teruya Miyamoto
輝也 宮本
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Miyamoto KK
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Miyamoto KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a bobbin thread feeder for sewing machine which saves the work to wind bobbins and to replace bobbins for sewing machine of embroidery machine, and enhances the working efficiency by feeding bobbin thread directly from the bobbin thread winding core preventing the bobbin thread from being entangled. <P>SOLUTION: The bobbin thread feeder for sewing machine is to feed a bobbin thread 1 to the sewing machine directly from the bobbin thread winding core 2. The bobbin thread feeder forms a notch 31a on the back side and comprises a bobbin case 31 held on the fitting side by the shuttle fitting mechanism 4, the outer shuttle hook 32 driven rotating by a rotary hook rotation driving mechanism 5, a cap member 33 of the bobbin case 31, a bobbin thread feeding tube 6 which opens opposing the notch 31a formed on the back side of the bobbin case 31, a thread tension device 7 located between the bobbin thread feeding tube 6 and the bobbin thread winding core 2, and a thread sweeping mechanism 9 located below a needle plate 8. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、ミシンの下糸供給装置及びそれに用いる釜部材に関し、特に、縫製用ミシン又は刺繍用ミシンにおける下糸巻作業及びボビンの交換作業をなくし、作業効率を高めることができるようにしたミシンの下糸供給装置及びそれに用いる釜部材に関するものである。
【0002】
【従来の技術】
従来、ミシンは、縫製用ミシン及び刺繍用ミシンのいずれにおいても、下糸をボビンに一旦巻き取り、この下糸を巻き取ったボビンをボビンケースへセットすることによって、下糸の供給を行うようにしている。
【0003】
【発明が解決しようとする課題】
この従来の方式によれば、ボビンの大きさに限界があるため、下糸巻作業及びボビンの交換作業が頻繁に発生し、特に、工業用ミシンによる縫製作業及び刺繍作業上、その作業性及び作業効率を悪化させる大きな原因となっている。
【0004】
この問題に対処するために、例えば、ボビンを、ボビンケースごと自動的に供給し、交換するボビンの自動供給装置も提案され、一部実用化されているが、ボビンの糸巻作業及びボビンのボビンケースへセット作業は依然として残るという問題があった。
【0005】
また、ボビンの自動供給装置は、構造が複雑で、開発コスト及び設備コストがかかるだけでなく、構造が複雑なため、故障時のメンテナンスに高度の知識と技術力を要するという問題があった。
【0006】
このほか、下糸を下糸巻芯より直接ミシンに供給するようにしたミシンの下糸供給装置も提案されているが(特許文献1)、このミシンの下糸供給装置は、内釜に中心軸が突設された構造のため、この中心軸に下糸が絡み付くため、実施化できないものであった。
【0007】
【特許文献1】
特開平9−108472号公報
【0008】
本発明は、下糸の絡み付きを防止しながら下糸を下糸巻芯より直接ミシンに供給するようにすることによって、縫製用ミシン又は刺繍用ミシンにおける下糸巻作業及びボビンの交換作業をなくし、作業効率を高めることができるようにしたミシンの下糸供給装置及びそれに用いる釜部材を提供することを目的とする。
【0009】
【課題を解決するための手段】
上記目的を達成するため、本発明のミシンの下糸供給装置は、下糸を下糸巻芯より直接ミシンに供給するようにしたミシンの下糸供給装置において、該下糸供給装置を、背面に切欠部を形成し、釜止め機構によって固定側に保持される内釜と、釜回転駆動機構により回転駆動される外釜と、内釜のキャップ部材と、釜回転駆動機構内に配設し、内釜の背面に形成した切欠部に対向して開口する下糸供給管と、下糸供給管と下糸巻芯との間に配設した糸調子器と、針板の下方に配設した糸払い機構とからなることを特徴とする。
【0010】
このミシンの下糸供給装置は、下糸供給装置を、背面に切欠部を形成し、釜止め機構によって固定側に保持される内釜と、釜回転駆動機構により回転駆動される外釜と、内釜のキャップ部材と、釜回転駆動機構内に配設し、内釜の背面に形成した切欠部に対向して開口する下糸供給管と、下糸供給管と下糸巻芯との間に配設した糸調子器と、針板の下方に配設した糸払い機構とからするようにしているので、下糸の絡み付きを防止しながら下糸を下糸巻芯より直接ミシンに供給することができる。
【0011】
そして、本発明のミシンの下糸供給装置は、縫製用ミシン及び刺繍用ミシンに広く適用することができる。
【0012】
この場合において、糸払い機構の駆動源を外釜の基端側位置に配設し、動力伝達機構を介して、駆動源の駆動力を糸払い機構に伝達するようにすることができる。
【0013】
これにより、糸払い機構の駆動源の配設位置を、ミシンの構造に合わせて任意に設定することができる。
【0014】
また、本発明のミシンの下糸供給装置に用いる釜部材は、背面に切欠部を形成し、釜止め機構によって固定側に保持される内釜と、釜回転駆動機構により回転駆動される外釜と、下糸を内釜から外部に引き出すための開口部を形成した、内釜に装着されるキャップ部材とからなることを特徴とする。
【0015】
このミシンの下糸供給装置の釜部材は、下糸巻芯からの下糸を釜部材に導入する操作を簡易に行うことができるため、作業効率を一層高めることができるとともに、簡易な構造のため、製造コストを低廉にできる。
【0016】
【発明の実施の形態】
以下、本発明のミシンの下糸供給装置及びそれに用いる釜部材の実施の形態を図面に基づいて説明する。
【0017】
図1〜図11に、本発明のミシンの下糸供給装置及びそれに用いる釜部材の一実施例を示す。
【0018】
このミシンの下糸供給装置は、下糸供給装置を刺繍用ミシンに適用したもので、下糸供給装置は、下糸1を下糸巻芯2より直接ミシンに供給するようにしたものであって、背面に、より具体的には、背面中心部から上部にかけて、切欠部31aを形成し、釜止め機構4によって固定側に保持される内釜31と、釜回転駆動機構5により回転駆動される外釜32と、下糸1を内釜31から外部に引き出すための開口部33aを形成した、内釜31に装着される内釜31のキャップ部材33とからなる釜部材3と、釜回転駆動機構5内に配設し、内釜31の背面に形成した切欠部31aに対向して開口する下糸供給管6と、下糸供給管6と下糸巻芯2との間に配設した糸調子器7と、針板8の下方に配設した糸払い機構9とから構成される。
【0019】
そして、下糸巻芯2から導出された下糸1は、糸調子器7を介することによって、必要以上の糸の繰り出しが防止され、さらに、必要に応じて、糸調子器7に下糸1の切断検知器を併設することによって、下糸1の切断を自動的に検知することができるようにした状態で、釜回転駆動機構5内に非回転状態に配設した下糸供給管6内に導入されるようにする。
なお、下糸巻芯2は、ミシンの適宜位置に配設することが可能で、必要に応じて、下糸導出口を上部に形成したカバー21を配設することができる。
【0020】
この場合、下糸供給管6内に導入された下糸1が、抵抗を受けることなく内釜31内に供給されるように、下糸供給管6の屈曲部には、必要に応じて、ローラ61等の摩擦低減部材を配設するようにする。
【0021】
下糸供給管6内に導入された下糸1は、内釜31の背面に形成した切欠部31aを介して、内釜31内に導入される。
この場合において、切欠部31aは、内釜31の背面中心部から上部にかけてスリット状に形成(図5に実線で示す。)するほか、内釜31の背面中心部から上部にかけて略V字状31aに形成(図5に2点鎖線で示す。)する等、適宜形状に形成することができる。
【0022】
そして、内釜31内に導入された下糸1は、内釜31に装着されたキャップ部材33に形成した開口部33aから外部に引き出され、この状態でミシンを駆動して刺繍(又は縫製)を開始するようにする。
なお、下糸1は、外釜32が2回転した後は、後述のように、内釜31内に導入された後、刺繍対象物12に延びるようになる。
【0023】
この場合、刺繍(又は縫製)が安定して開始することができるように、内釜31に装着されたキャップ部材33に形成した開口部33aから外部に引き出された下糸1の端部を、図7に示すように、開口部33aの上端部に装着したばね部材の上面に起毛を施した滑り止め部材33bの上面側に回り込ませて、滑り止め部材33bの起毛によって保持するようにする。
なお、本実施例においては、キャップ部材33は、実質的に消耗する部分がないため、内釜31に接着等により固定状態に装着するようにしているが、必要に応じて、ビス等により分解可能に装着するように構成することもできる。
【0024】
なお、下糸巻芯2から導出された下糸1は、糸調子器7に掛けられた後、図2に示すように、先端に下糸保持片を形成した針金状の治具11を用いて、下糸供給管6、内釜31及びキャップ部材33に形成した開口部33aに通され、下糸供給装置に装着される。
【0025】
また、針板8の下方に配設した糸払い機構9は、図10に示すように、刺繍(又は縫製)時において、内釜31内に導入された後、刺繍対象物12に延びる下糸1が、回転する外釜32の上糸引掛片32aに引っ掛からないようにするために、外釜32の基端側の待機位置(図10(b))から針板8に形成された針孔8aの下方を通過してキャップ部材33側(図10(c))まで移動することによって、下糸1をキャップ部材33側に払うようにするものである。
そして、糸払い機構9の先端部91は、下糸1を確実に捉えることができ、かつ、糸払い機構9の後退時に、下糸1から確実に離脱できるように、緩い曲線からなるフック状に形成するようにする。
また、糸払い機構9の駆動源92としては、ステッピングモータ、ロータリーソレノイド、直線ソレノイド等の任意の駆動源を用いることができるが、応答性等の点で、ステッピングモータを用いることが好ましい。
また、糸払い機構9の駆動源92は、釜回転駆動機構5及びミシンの針棒の駆動機構(図示省略)等とポジションコーダーによってタイミングをとるようにする。
【0026】
なお、本実施例においては、糸払い機構9の駆動源92を釜部材3のキャップ部材33側の前方に配設するようにしたが、図12に示す変形実施例のように、ミシンの構造上の都合等で、釜部材3に近接した位置に駆動源92を配設できない場合には、駆動源92を釜部材3の外釜32の基端側等の適宜位置に配設し、レバー、リンク等の適宜の動力伝達機構93を介在させて、駆動源92の駆動力を糸払い機構9に伝達するようにすることもできる。
【0027】
なお、本実施例においては、1頭のミシンヘッドについて説明したが、本実施例のような多数のミシンヘッドを並設する刺繍用ミシンにおいては、図11に示すように、多数のミシンヘッド間で釜回転駆動機構5を連動するように構成することができる。
この場合、釜回転駆動機構5の共通の駆動軸5aと下糸供給管6とが抵触しないように、図2に示すように、中間伝動軸5c等の適宜の動力伝達機構5bを介在させて、駆動軸5aの回転力を外釜32に伝達するようにする。
【0028】
次に、このように構成したミシンの下糸供給装置の動作について、図8〜図10を用いて説明する。
なお、本実施例の刺繍用ミシンは、針10が1往復する間に、外釜32が釜回転駆動機構5により2回転するように構成されたものを例示するが、その他の駆動方式、例えば、正逆回転駆動方式のものを排除するものでない。
【0029】
まず、内釜31に装着されたキャップ部材33に形成した開口部33aから外部に引き出された下糸1の端部を、図7に示すように、開口部33aの上端部に装着したばね部材の上面に起毛を施した滑り止め部材33bの上面側に回り込ませて、滑り止め部材33bの起毛によって保持するようにするとともに、上糸13を挿通した針10が刺繍対象物12の上方に位置した状態で、外釜32を釜回転駆動機構5により回転駆動する(図8(a)、図10(a−1)、(a−2))。
そして、外釜32が2回転目に入る直前に、針10が刺繍対象物12を縫って降下し、針10に挿通された上糸13を外釜32の上糸引掛片32aにより引っ掛けるようにする(図8(b))。
その後、針10は上昇し、一方、上糸13を上糸引掛片32aに引っ掛けた外釜32はさらに回転して(図8(c)、図9(d))、上糸13によって形成されるループが、下糸1の端部の内側とキャップ部材33の外側を通って、ループ内に下糸1の端部が入るようになる(図9(e))。
そして、天秤(図示省略)の作用によって、針10に挿通された上糸13が引き上げられるとともに、上糸13を上糸引掛片32aに引っ掛けた外釜32がさらに回転して、上糸引掛片32aから上糸13が外れ(図9(f))、上糸13が締まって(図9(g)、図10(b))、1針目の刺繍(又は縫製)が完了する。
なお、下糸1は、外釜32が2回転した後は、内釜31内に導入された後、刺繍対象物12に延びるようになるため、2針目の刺繍(又は縫製)は、この下糸1を上糸13に絡めるようにして刺繍(又は縫製)を行うようにする。
以下、同様にして、針10が1往復する間に、外釜32が釜回転駆動機構5により2回転して、刺繍(又は縫製)が行われる。
なお、上記の刺繍(又は縫製)工程は、従来のミシンと同様である。
【0030】
ところで、この刺繍(又は縫製)時において、下糸1は、内釜31内に導入された後、刺繍対象物12に延びることになるが、そのままの状態では、張設された下糸1が回転する外釜32の上糸引掛片32aに引っ掛かることになってしまい、刺繍(又は縫製)を行うことが不可能となる。
このため、糸払い機構9により、例えば、図9(f)から図9(g)の段階で糸払い機構9の駆動源92を駆動して、糸払い機構9の先端部91を、外釜32の基端側の待機位置(図10(b))から針板8に形成された針孔8aの下方を通過してキャップ部材33側(図10(c))まで移動することによって、糸払い機構9の先端部91に下糸1を引っ掛け、下糸1が回転する外釜32の上糸引掛片32aに引っ掛からないように、下糸1をキャップ部材33側(図10(c)において左側)に払うようにする。
そして、外釜32が釜回転駆動機構5により1回空転する間(針10が刺繍対象物12を縫って降下する前)の適宜段階で、糸払い機構9の駆動源92を駆動して、糸払い機構9を待機位置まで後退させるようにする(図10(d))。
以下、同様にして、針10が1往復する間に、糸払い機構9を待機位置と糸払い位置との間で1往復させるようにしながら、刺繍(又は縫製)を行うようにする。
【0031】
以上、本発明のミシンの下糸供給装置及びそれに用いる釜部材を、刺繍用ミシンに適用した実施例に基づいて説明したが、本発明のミシンの下糸供給装置及びそれに用いる釜部材の構成は、その趣旨を逸脱しない範囲において適宜に変更することが可能である。
また、本発明のミシンの下糸供給装置及びそれに用いる釜部材は、実施例に示した刺繍用ミシンのほか、縫製用ミシン等にも広く適用することができ、さらに、本発明のミシンの下糸供給装置及びそれに用いる釜部材は、簡易な構造のため、例えば、既存のミシンにも少しの改造によって簡易に組み込むことが可能で、本発明はこれを排除しないものである。
【0032】
【発明の効果】
本発明のミシンの下糸供給装置によれば、下糸供給装置を、背面に切欠部を形成し、釜止め機構によって固定側に保持される内釜と、釜回転駆動機構により回転駆動される外釜と、内釜のキャップ部材と、釜回転駆動機構内に配設し、内釜の背面に形成した切欠部に対向して開口する下糸供給管と、下糸供給管と下糸巻芯との間に配設した糸調子器と、針板の下方に配設した糸払い機構とからするようにしているので、下糸の絡み付きを防止しながら下糸を下糸巻芯より直接ミシンに供給することができ、これによって、縫製用ミシン又は刺繍用ミシンにおける下糸巻作業及びボビンの交換作業をなくし、作業効率を高めることができる。
【0033】
そして、本発明のミシンの下糸供給装置は、縫製用ミシン及び刺繍用ミシンに広く適用することができる。
【0034】
また、糸払い機構の駆動源を外釜の基端側位置に配設し、動力伝達機構を介して、駆動源の駆動力を糸払い機構に伝達するようにすることにより、糸払い機構の駆動源の配設位置を、ミシンの構造に合わせて任意に設定することができる。
【0035】
また、本発明のミシンの下糸供給装置の釜部材によれば、下糸巻芯からの下糸を釜部材に導入する操作を簡易に行うことができるため、作業効率を一層高めることができるとともに、簡易な構造のため、製造コストを低廉にできる。
【図面の簡単な説明】
【図1】本発明のミシンの下糸供給装置の一実施例を示す全体構成図である。
【図2】同要部を示す側面断面図である。
【図3】同要部を示す平面図である。
【図4】同要部を示す正面図である。
【図5】内釜を示し、(a)は斜視図、(b)は平面図、(c)は正面図、(d)は側面図である。
【図6】外釜を示し、(a)は斜視図、(b)は正面図、(c)は側面断面図である。
【図7】キャップ部材を示し、(a)は分解した斜視図、(b)は平面図、(c)は正面図、(d)は側面図である。
【図8】ミシンの下糸供給装置の正面から見た動作説明図である。
【図9】ミシンの下糸供給装置の正面から見た動作説明図である。
【図10】ミシンの下糸供給装置の側面((a−1)のみ正面)から見た動作説明図である。
【図11】釜回転駆動機構の説明図である。
【図12】変形実施例の糸払い機構の説明図で、(a)は平面図、(b)は要部の斜視図、(c)は正面図である。
【符号の説明】
1 下糸
2 下糸巻芯
3 釜部材
31 内釜
31a 切欠部
32 外釜
33 キャップ部材
4 釜止め機構
5 釜回転駆動機構
6 下糸供給管
7 糸調子器
8 針板
9 糸払い機構
10 針
11 治具
12 刺繍対象物
13 上糸
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lower thread supply device of a sewing machine and a shuttle member used for the lower thread supply device, and more particularly, to a lower thread feeding device for a sewing machine or an embroidery sewing machine, which eliminates a lower thread winding operation and a bobbin replacing operation, thereby improving the operation efficiency. The present invention relates to a lower thread supply device and a shuttle member used therefor.
[0002]
[Prior art]
Conventionally, in both sewing machines and embroidery sewing machines, a lower thread is once wound on a bobbin, and the bobbin on which the lower thread is wound is set on a bobbin case to supply the lower thread. I have to.
[0003]
[Problems to be solved by the invention]
According to this conventional method, the bobbin size is limited, so that the bobbin winding operation and the bobbin replacing operation frequently occur. Particularly, in the sewing operation and the embroidery operation by the industrial sewing machine, the workability and the workability are reduced. It is a major cause of efficiency deterioration.
[0004]
In order to cope with this problem, for example, an automatic bobbin supplying apparatus for automatically supplying and replacing bobbins for each bobbin case has also been proposed and partially put into practical use. There was a problem that the setting work still remains in the case.
[0005]
In addition, the automatic bobbin feeding apparatus has a problem that not only the structure is complicated and development and equipment costs are required, but also because the structure is complicated, maintenance at the time of failure requires a high degree of knowledge and technical ability.
[0006]
In addition, a lower thread supply device for a sewing machine in which a lower thread is supplied directly from a lower thread core to a sewing machine has been proposed (Patent Document 1). However, since the lower thread is entangled with this central axis due to the structure in which the projection is provided, it cannot be implemented.
[0007]
[Patent Document 1]
JP-A-9-108472
The present invention eliminates bobbin winding work and bobbin replacement work in a sewing sewing machine or an embroidery sewing machine by supplying a bobbin thread directly from a bobbin bobbin while preventing the bobbin thread from becoming entangled. It is an object of the present invention to provide a lower thread supply device of a sewing machine that can improve efficiency and a shuttle member used therefor.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a lower thread supply device for a sewing machine according to the present invention is a lower thread supply device for a sewing machine that supplies a lower thread directly to a sewing machine from a lower thread core. A notch is formed, an inner hook held on a fixed side by a hook stopper mechanism, an outer hook driven to rotate by a hook rotation driving mechanism, a cap member of the inner hook, and a hook rotating drive mechanism, A lower thread supply pipe opening opposite to a notch formed in the back of the inner hook; a thread tensioner disposed between the lower thread supply pipe and the lower thread core; and a thread disposed below the needle plate. And a payment mechanism.
[0010]
The lower thread supply device of the sewing machine includes a lower thread supply device, a notch formed on a back surface, an inner shuttle held on a fixed side by a shuttle stop mechanism, and an outer shuttle driven to rotate by a shuttle rotation drive mechanism. A lower thread supply pipe which is disposed in the cap member of the inner hook, and which is disposed in the shuttle rotation driving mechanism, and which opens to face a notch formed on the back of the inner hook, and between the lower thread supply pipe and the lower thread core. Since the thread tension device provided and the thread wiper mechanism provided below the needle plate are configured to be connected, the lower thread can be supplied directly from the lower thread core to the sewing machine while preventing the lower thread from being entangled. it can.
[0011]
The lower thread supply device of the sewing machine of the present invention can be widely applied to sewing machines and embroidery sewing machines.
[0012]
In this case, the drive source of the thread wiper can be disposed at the base end side of the outer hook, and the driving force of the drive source can be transmitted to the thread wiper via the power transmission mechanism.
[0013]
This makes it possible to arbitrarily set the arrangement position of the drive source of the thread removing mechanism in accordance with the structure of the sewing machine.
[0014]
Further, the shuttle member used in the lower thread supply device of the sewing machine of the present invention has a cutout on the back surface, and an inner shuttle held on a fixed side by a shuttle stopper mechanism, and an outer shuttle driven to rotate by a shuttle rotation drive mechanism. And a cap member formed in the inner hook and having an opening for drawing the lower thread from the inner hook to the outside.
[0015]
Since the shuttle member of the lower thread supply device of this sewing machine can easily perform the operation of introducing the lower thread from the lower thread core into the shuttle member, the working efficiency can be further improved, and the simple structure is achieved. In addition, the manufacturing cost can be reduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a lower thread supply device of a sewing machine of the present invention and a shuttle member used therein will be described with reference to the drawings.
[0017]
1 to 11 show an embodiment of the lower thread supply device of the sewing machine of the present invention and a shuttle member used therefor.
[0018]
In the lower thread supply device of this sewing machine, the lower thread supply device is applied to an embroidery sewing machine, and the lower thread supply device supplies the lower thread 1 directly from the lower thread core 2 to the sewing machine. A notch 31a is formed on the back surface, more specifically, from the center to the upper portion of the back surface, and the inner hook 31 held on the fixed side by the hook stopper mechanism 4 is driven to rotate by the hook rotation drive mechanism 5. Hook member 3 comprising an outer hook 32, a cap member 33 of the inner hook 31 attached to the inner hook 31 having an opening 33a for drawing out the lower thread 1 from the inner hook 31 to the outside, and a hook rotating drive A lower thread supply pipe 6 which is disposed in the mechanism 5 and opens opposite to a notch 31a formed on the back surface of the inner shuttle 31; and a thread disposed between the lower thread supply pipe 6 and the lower thread core 2. It comprises a tensioner 7 and a thread removing mechanism 9 disposed below the needle plate 8.
[0019]
The lower thread 1 led out from the lower thread core 2 is prevented from being unnecessarily fed out by passing through the thread tensioner 7, and, if necessary, the lower thread 1 is supplied to the thread tensioner 7. In the state where the cutting of the lower thread 1 can be automatically detected by providing a cutting detector, the lower thread supply pipe 6 disposed in the non-rotating state in the shuttle rotation driving mechanism 5 is provided. To be introduced.
The bobbin winding core 2 can be disposed at an appropriate position of the sewing machine, and a cover 21 having a bobbin thread outlet formed at an upper portion thereof can be disposed as necessary.
[0020]
In this case, if necessary, the bent portion of the lower thread supply pipe 6 is provided at the bent portion of the lower thread supply pipe 6 so that the lower thread 1 introduced into the lower thread supply pipe 6 is supplied into the inner shuttle 31 without receiving resistance. A friction reducing member such as a roller 61 is provided.
[0021]
The lower thread 1 introduced into the lower thread supply pipe 6 is introduced into the inner hook 31 through a cutout portion 31 a formed on the back surface of the inner hook 31.
In this case, the notch 31a is formed in a slit shape from the center of the back of the inner pot 31 to the upper part (shown by a solid line in FIG. 5), and is also substantially V-shaped from the center of the back of the inner pot 31 to the upper part. (Indicated by a two-dot chain line in FIG. 5).
[0022]
The bobbin thread 1 introduced into the inner hook 31 is pulled out from the opening 33a formed in the cap member 33 attached to the inner hook 31, and in this state, the sewing machine is driven to perform embroidery (or sewing). To start.
After the outer shuttle 32 makes two rotations, the lower thread 1 is introduced into the inner shuttle 31 and then extends to the embroidery object 12 as described later.
[0023]
In this case, the end of the lower thread 1 pulled out from the opening 33a formed in the cap member 33 attached to the inner hook 31 is removed so that embroidery (or sewing) can start stably. As shown in FIG. 7, the upper surface of the spring member mounted on the upper end of the opening 33a is wrapped around the upper surface of the non-slip member 33b having a raised surface to be held by the raised surface of the non-slip member 33b.
In this embodiment, the cap member 33 is attached to the inner pot 31 in a fixed state by bonding or the like because there is no substantially consumable portion. It can also be configured to be mounted as possible.
[0024]
After the lower thread 1 led out from the lower thread core 2 is hooked on a thread tensioner 7, as shown in FIG. 2, a wire-like jig 11 having a lower thread holding piece formed at the tip end is used. The lower thread supply pipe 6, the inner hook 31, and the opening 33 a formed in the cap member 33 pass through the lower thread supply device.
[0025]
As shown in FIG. 10, the thread removing mechanism 9 disposed below the needle plate 8 is used to introduce the bobbin thread into the inner hook 31 and then extend to the embroidery object 12 at the time of embroidery (or sewing). In order to prevent the needle 1 from being hooked on the upper thread hooking piece 32a of the rotating outer hook 32, a needle hole formed in the needle plate 8 from the standby position (FIG. 10B) on the base end side of the outer hook 32. The lower thread 1 is swept toward the cap member 33 by moving to the side of the cap member 33 (FIG. 10 (c)) by passing below the portion 8a.
The distal end portion 91 of the thread removing mechanism 9 has a hook-like shape having a gentle curve so that the lower thread 1 can be reliably caught and detached from the lower thread 1 when the thread removing mechanism 9 is retracted. To be formed.
Further, as the drive source 92 of the thread removing mechanism 9, any drive source such as a stepping motor, a rotary solenoid, and a linear solenoid can be used, but it is preferable to use a stepping motor in terms of responsiveness and the like.
The drive source 92 of the thread wiping mechanism 9 is controlled by a rotary mechanism 5 and a needle bar drive mechanism (not shown) of the sewing machine and a position coder.
[0026]
In the present embodiment, the drive source 92 of the thread wiping mechanism 9 is arranged in front of the hook member 3 on the side of the cap member 33. However, as in a modified embodiment shown in FIG. If the drive source 92 cannot be arranged at a position close to the shuttle member 3 due to the above reasons, the drive source 92 is arranged at an appropriate position such as the base end side of the outer shuttle 32 of the shuttle member 3 and the lever The driving force of the drive source 92 can be transmitted to the thread wiping mechanism 9 through an appropriate power transmission mechanism 93 such as a link.
[0027]
In this embodiment, one sewing head has been described. However, in an embroidery sewing machine in which a large number of sewing heads are arranged in parallel as in this embodiment, as shown in FIG. And the shuttle rotation drive mechanism 5 can be configured to interlock.
In this case, an appropriate power transmission mechanism 5b such as an intermediate transmission shaft 5c is interposed as shown in FIG. 2 so that the common drive shaft 5a of the shuttle rotation drive mechanism 5 does not conflict with the lower thread supply pipe 6. The torque of the drive shaft 5a is transmitted to the outer shuttle 32.
[0028]
Next, the operation of the lower thread supply device having the above-described configuration will be described with reference to FIGS.
The embroidery sewing machine according to the present embodiment exemplifies a configuration in which the outer shuttle 32 is rotated twice by the shuttle rotation drive mechanism 5 while the needle 10 makes one reciprocation. However, it does not exclude the forward and reverse rotation drive type.
[0029]
First, as shown in FIG. 7, the end of the lower thread 1 pulled out from the opening 33a formed in the cap member 33 attached to the inner hook 31 is attached to the upper end of the opening 33a. The upper surface of the non-slip member 33b having a raised surface is wrapped around the upper surface of the non-slip member 33b so as to be held by the raised surface of the non-slip member 33b. In this state, the outer shuttle 32 is rotationally driven by the shuttle rotation drive mechanism 5 (FIGS. 8 (a), 10 (a-1), and (a-2)).
Then, just before the outer shuttle 32 enters the second rotation, the needle 10 descends by sewing the embroidery object 12, and the upper thread 13 inserted through the needle 10 is hooked by the upper thread hooking piece 32 a of the outer shuttle 32. (FIG. 8B).
Thereafter, the needle 10 is raised, while the outer shuttle 32 that has hooked the upper thread 13 on the upper thread hooking piece 32a is further rotated (FIGS. 8C and 9D), and is formed by the upper thread 13. The loop passes through the inside of the end of the lower thread 1 and the outside of the cap member 33, and the end of the lower thread 1 enters the loop (FIG. 9E).
Then, the upper thread 13 inserted through the needle 10 is pulled up by the operation of a balance (not shown), and the outer hook 32, which has hooked the upper thread 13 on the upper thread hooking piece 32a, is further rotated, and the upper thread hooking piece is rotated. The upper thread 13 comes off from 32a (FIG. 9 (f)) and the upper thread 13 is tightened (FIGS. 9 (g) and 10 (b)), and the embroidery (or sewing) of the first stitch is completed.
After the outer hook 32 makes two rotations, the lower thread 1 is introduced into the inner hook 31 and then extends to the embroidery object 12, so that the embroidery (or sewing) of the second needle is performed under this lower needle. Embroidery (or sewing) is performed such that the thread 1 is entangled with the upper thread 13.
Hereinafter, similarly, while the needle 10 makes one reciprocation, the outer shuttle 32 is rotated twice by the shuttle rotation drive mechanism 5 to perform embroidery (or sewing).
The embroidery (or sewing) process is the same as that of a conventional sewing machine.
[0030]
By the way, at the time of this embroidery (or sewing), the lower thread 1 is introduced into the inner hook 31 and then extends to the embroidery object 12, but in this state, the stretched lower thread 1 Since the upper thread hooking piece 32a of the rotating outer hook 32 is hooked, embroidery (or sewing) cannot be performed.
For this reason, the drive source 92 of the thread wiping mechanism 9 is driven by the thread wiping mechanism 9 at the stage of, for example, FIGS. By moving from the standby position (FIG. 10B) on the base end side of the needle 32 to below the needle member 8a formed in the needle plate 8 to the cap member 33 side (FIG. 10C), the thread The lower thread 1 is hooked on the distal end portion 91 of the wiping mechanism 9, and the lower thread 1 is placed on the cap member 33 side (in FIG. 10C) so that the lower thread 1 does not catch on the upper thread hooking piece 32 a of the outer shuttle 32 that rotates. (Left side).
Then, at an appropriate stage while the outer shuttle 32 idles once by the shuttle rotation drive mechanism 5 (before the needle 10 descends by sewing the embroidery object 12), the drive source 92 of the thread removing mechanism 9 is driven. The thread removing mechanism 9 is retracted to the standby position (FIG. 10D).
Hereinafter, similarly, while the needle 10 makes one reciprocation, the thread wiping mechanism 9 makes one reciprocation between the standby position and the thread wiping position, and embroidery (or sewing) is performed.
[0031]
As described above, the lower thread supply device of the sewing machine of the present invention and the shuttle member used therefor have been described based on the embodiment in which the sewing machine for embroidery is applied. However, it can be appropriately changed without departing from the spirit of the invention.
Further, the lower thread supply device of the sewing machine of the present invention and the shuttle member used therefor can be widely applied to sewing machines and the like in addition to the embroidery sewing machine shown in the embodiment. Since the yarn supplying device and the shuttle member used for the yarn supplying device have a simple structure, for example, the yarn supplying device can be easily incorporated into an existing sewing machine with a slight modification, and the present invention does not exclude this.
[0032]
【The invention's effect】
According to the lower thread supply device of the sewing machine of the present invention, the lower thread supply device is formed by forming a notch on the back surface, and is internally driven by a hook stopper mechanism and held on a fixed side, and is rotationally driven by a shuttle rotation drive mechanism. An outer hook, a cap member of the inner hook, and a lower thread supply pipe disposed in the shuttle rotation drive mechanism and opening to face a notch formed on the back surface of the inner shuttle, a lower thread supply pipe, and a lower thread core. Between the thread tensioner and the thread wiper mechanism located below the needle plate, so that the lower thread can be sent directly to the sewing machine from the lower thread core while preventing the lower thread from becoming entangled. Thus, the bobbin winding operation and the bobbin replacement operation of the sewing machine or the embroidery sewing machine can be omitted, and the working efficiency can be improved.
[0033]
The lower thread supply device of the sewing machine of the present invention can be widely applied to sewing machines and embroidery sewing machines.
[0034]
In addition, the drive source of the thread removing mechanism is arranged at the base end side position of the outer hook, and the driving force of the drive source is transmitted to the thread removing mechanism via the power transmission mechanism, so that the thread removing mechanism is driven. The arrangement position of the drive source can be arbitrarily set according to the structure of the sewing machine.
[0035]
Further, according to the shuttle member of the lower thread supply device of the sewing machine of the present invention, the operation of introducing the lower thread from the lower thread core into the shuttle member can be easily performed, and the working efficiency can be further improved. Because of the simple structure, the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of a lower thread supply device of a sewing machine according to the present invention.
FIG. 2 is a side sectional view showing the relevant part.
FIG. 3 is a plan view showing the main part.
FIG. 4 is a front view showing the relevant part.
5 (a) is a perspective view, FIG. 5 (b) is a plan view, FIG. 5 (c) is a front view, and FIG. 5 (d) is a side view.
6A and 6B show an outer hook, wherein FIG. 6A is a perspective view, FIG. 6B is a front view, and FIG. 6C is a side sectional view.
7A and 7B show a cap member, wherein FIG. 7A is an exploded perspective view, FIG. 7B is a plan view, FIG. 7C is a front view, and FIG. 7D is a side view.
FIG. 8 is an operation explanatory view of the lower thread supply device of the sewing machine as viewed from the front.
FIG. 9 is an operation explanatory view of the lower thread supply device of the sewing machine as viewed from the front.
FIG. 10 is an operation explanatory view of the lower thread supply device of the sewing machine as viewed from the side (only (a-1) is viewed from the front).
FIG. 11 is an explanatory view of a shuttle driving mechanism.
FIGS. 12A and 12B are explanatory views of a thread removing mechanism according to a modified embodiment, in which FIG. 12A is a plan view, FIG. 12B is a perspective view of a main part, and FIG. 12C is a front view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower thread 2 Lower thread core 3 Hook member 31 Inner hook 31a Notch 32 Outer hook 33 Cap member 4 Hook stopping mechanism 5 Hook rotation drive mechanism 6 Lower thread supply pipe 7 Thread tensioner 8 Needle plate 9 Thread wiper mechanism 10 Needle 11 Jig 12 Embroidery object 13 Upper thread

Claims (5)

下糸を下糸巻芯より直接ミシンに供給するようにしたミシンの下糸供給装置において、該下糸供給装置を、背面に切欠部を形成し、釜止め機構によって固定側に保持される内釜と、釜回転駆動機構により回転駆動される外釜と、内釜のキャップ部材と、釜回転駆動機構内に配設し、内釜の背面に形成した切欠部に対向して開口する下糸供給管と、下糸供給管と下糸巻芯との間に配設した糸調子器と、針板の下方に配設した糸払い機構とからなることを特徴とするミシンの下糸供給装置。In a lower thread supply device of a sewing machine in which a lower thread is supplied directly from a lower thread core to a sewing machine, the lower thread supply device is formed with a cutout portion on a back surface, and an inner shuttle held on a fixed side by a shuttle stop mechanism. And an outer hook rotatably driven by the hook rotary drive mechanism, a cap member of the inner hook, and a lower thread supply disposed in the hook rotary drive mechanism and opening opposite to the notch formed on the back surface of the inner hook. A lower thread supply device for a sewing machine, comprising: a pipe; a thread tensioner disposed between the lower thread supply pipe and the lower thread core; and a thread removing mechanism disposed below the needle plate. ミシンが縫製用ミシンであることを特徴とする請求項1記載のミシンの下糸供給装置。2. The lower thread supply device according to claim 1, wherein the sewing machine is a sewing machine. ミシンが刺繍用ミシンであることを特徴とする請求項1記載のミシンの下糸供給装置。The lower thread supply device according to claim 1, wherein the sewing machine is an embroidery sewing machine. 糸払い機構の駆動源を外釜の基端側位置に配設し、動力伝達機構を介して、駆動源の駆動力を糸払い機構に伝達するようにしたことを特徴とする請求項1、2又は3記載のミシンの下糸供給装置。The drive source of the thread wiper is disposed at a base end position of the outer hook, and the driving force of the drive source is transmitted to the thread wiper via a power transmission mechanism. 4. The lower thread supply device of the sewing machine according to 2 or 3. 請求項1、2、3又は4記載のミシンの下糸供給装置に用いる釜部材であって、背面に切欠部を形成し、釜止め機構によって固定側に保持される内釜と、釜回転駆動機構により回転駆動される外釜と、下糸を内釜から外部に引き出すための開口部を形成した、内釜に装着されるキャップ部材とからなることを特徴とするミシンの下糸供給装置の釜部材。5. A shuttle member used in the lower thread supply device of the sewing machine according to claim 1, wherein a notch portion is formed on the back surface, and an inner shuttle held on a fixed side by a shuttle stopper mechanism, and a shuttle drive. A lower thread supply device for a sewing machine, comprising: an outer hook driven by a mechanism; and a cap member having an opening formed therein for drawing out the lower thread from the inner hook to the outside. Hook member.
JP2003037942A 2003-02-17 2003-02-17 Bobbin thread feeder for sewing machine and rotary hook member used therein Pending JP2004243001A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010035444A (en) * 2008-07-31 2010-02-18 Globeride Inc Fishing line case
CN101899751A (en) * 2010-08-23 2010-12-01 杨志红 Bobbin case for embroidery machines and sewing machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010035444A (en) * 2008-07-31 2010-02-18 Globeride Inc Fishing line case
CN101899751A (en) * 2010-08-23 2010-12-01 杨志红 Bobbin case for embroidery machines and sewing machines

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