JP3238920U - Flat sewing machine bird's nest prevention device - Google Patents

Flat sewing machine bird's nest prevention device Download PDF

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JP3238920U
JP3238920U JP2022002185U JP2022002185U JP3238920U JP 3238920 U JP3238920 U JP 3238920U JP 2022002185 U JP2022002185 U JP 2022002185U JP 2022002185 U JP2022002185 U JP 2022002185U JP 3238920 U JP3238920 U JP 3238920U
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進元 ▲カン▼
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強信機械科技(莱州)有限公司
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Abstract

【課題】平ミシン鳥の巣防止装置を提供する。【解決手段】本考案の平ミシン鳥の巣防止装置は、押さえ1及び押さえに枢着する押さえ柄2を含み、押さえ柄の孔内に吸気管と糸フック4を設置し、糸フックの尾部が糸フック接続板5に挿入され、押さえ柄の上方が接続ロッド6の一端に枢着し、接続ロッドの他端が糸フック接続板に枢着し、押さえ柄が気圧シリンダ7のシリンダ体72に固定され、気圧シリンダのピストンロッド71が接続ロッドの中部63と枢着し、押さえ中部の浅溝内にラウンドカッターを設置し、押さえの2つの押さえ足14の間に縫い糸を挿入可能なスリットを設置し、ラウンドカッターの周縁刃部が一部のスリットを覆う。糸先端とラウンドカッターの刃部の間は、極小な作用力を有するだけで糸先端を切断でき、糸フック装置が押さえ柄内に設置され、糸フック装置の変形を防止し、装置全体の使用を確保し、比較的大きな人身財産損失を引き起こすことを回避することができる。【選択図】図1A flat perforation bird's nest prevention device is provided. A bird's nest prevention device for a flat sewing machine includes a presser foot (1) and a presser foot (2) pivotally attached to the presser foot. is inserted into the thread hook connecting plate 5, the upper part of the presser shaft is pivotally attached to one end of the connecting rod 6, the other end of the connecting rod is pivotally attached to the thread hook connecting plate, and the presser handle is the cylinder body 72 of the pneumatic cylinder 7. , the piston rod 71 of the pneumatic cylinder is pivotally connected to the middle part 63 of the connecting rod, a round cutter is installed in the shallow groove in the middle part of the presser, and a slit that allows the sewing thread to be inserted between the two presser feet 14 of the presser. and the peripheral edge of the round cutter covers part of the slit. Between the thread tip and the blade part of the round cutter, the thread tip can be cut with only a very small acting force, and the thread hook device is installed in the presser handle to prevent deformation of the thread hook device and the use of the whole device. and avoid causing a relatively large loss of personal property. [Selection drawing] Fig. 1

Description

本発明は、ミシン分野に関し、特に、平ミシンに用いる鳥の巣防止装置に関する。 The present invention relates to the field of sewing machines, and more particularly to a bird's nest prevention device for flat sewing machines.

一般の平ミシンの縫い始め時、糸が押さえ足面上に縫製を開始し、先頭箇所に下糸が出現する糸ダマ現象を「鳥の巣」と称する。現在のコンピュータ糸切りミシンは、縫い糸を使用し、縫い布上にステッチを形成し、一層又は多層の縫い布を交織又は縫い合わせ、且つ通常は、薄い布及び暑い布を縫製する二種の用途に分けられる。コンピュータ糸切り平縫い機能は、麻、絹、人工繊維等の織物及び革、プラスチック、紙等の製品を縫製し、薄い布は、一般に下着、シャツ、制服等をニッティングすることに用い、厚い布は、一般に各種運動着、デニム、おしゃれ着、コート、レザーハット、バッグ等に用い、コンピュータ糸切平ミシンがミシン装置中の最も基本的機種であるが、現有の平ミシンの縫い始め時、下糸に容易に鳥の巣現象が発生し、製品の品質に影響を及ぼし、歩留まりが低下する。 At the start of sewing with a general flat sewing machine, the thread starts sewing on the presser foot surface and the bobbin thread appears at the top of the thread, which is called a "bird's nest" phenomenon. The current computer thread trimmer sewing machine uses sewing thread to form stitches on the sewing cloth, interweaves or stitches single or multiple layers of sewing cloth, and usually has two uses: sewing thin cloth and hot cloth. divided. The computer thread trimmer flat stitch function can sew hemp, silk, artificial fiber, etc. fabrics, leather, plastic, paper, etc. Thin fabrics are generally used for knitting underwear, shirts, uniforms, etc. Cloth is generally used for sportswear, denim, fashion clothes, coats, leather hats, bags, etc. Computerized flat sewing machines with thread trimmers are the most basic sewing machines. The bird's nest phenomenon easily occurs in the bobbin thread, affecting the quality of the product and reducing the yield.

公開番号は、CN104911838Aの中国発明専利は、ミシン鳥の巣除去装置及び使用方法を公開しており、該鳥の巣除去装置は、マシンヘッド下方に位置するフック、糸挟み板、縫い針及び押さえ足を含み、フックが回転軸及びマシンヘッドを接続することによって、縫い針上に縫い糸を通過させる針孔を設け、押さえ足が針板上に位置し、押さえ足に縫い針と対応する糸渡し溝を設け、糸渡し溝は、縫い布の移動方向に沿って延伸し、糸渡し溝の底部にカッターを設ける。該ミシンは、円弧振動糸フック糸挟み装置を採用し、糸を切断後に糸の先端を挟み、次に縫い始める時に2つの糸グリッパの糸を挟み、糸を緩める時間の組み合わせによって、縫い始めに十分に安定した糸量を提供する為、下糸をもたない状況で迅速に上糸を締め付け、挟んだ糸の先端が縫い布の針の孔付近の位置で切断され、残留する糸の先端が短く、鳥の巣の糸先端の問題を解決する。 The Chinese invention patent with publication number CN104911838A discloses a sewing machine bird's nest removing device and method of use, which comprises a hook, a thread clamp plate, a sewing needle and a presser located under the machine head. Including a foot, a hook connects the rotating shaft and the machine head to provide a needle hole for passing the sewing thread on the sewing needle, a presser foot is located on the needle plate, and the presser foot has a sewing needle and a corresponding thread transfer A groove is provided, the thread passing groove extends along the moving direction of the sewing cloth, and a cutter is provided at the bottom of the thread passing groove. The sewing machine adopts an arc vibrating thread hook thread clamping device, which clamps the tip of the thread after cutting the thread, and then clamps the thread with two thread grippers when starting sewing, and by combining the time of loosening the thread, In order to provide a sufficiently stable amount of thread, the upper thread is quickly tightened in the absence of a bobbin thread, and the tip of the sandwiched thread is cut at a position near the needle hole in the sewing cloth, leaving the remaining thread tip. is short, solving the problem of the thread tip of the bird's nest.

公開番号は、CN20418562Uの中国実用新案は、コンピュータ糸切り平ミシンの鳥の巣防止装置を公開しており、ミシン本体上に鳥の巣防止装置を取り付け、鳥の巣防止装置は、糸緩め電磁鉄、糸フック装置及び高低押さえ足を含む。高低押さえ足は、押さえ足ヘッドを含み、押さえ足ヘッド下端に押さえ足底部及び押さえ足辺部を取り付け、押さえ足辺部上部に2つの独立した方形柱を設け、2つの方形柱内部に取り付け溝を設け、取り付け溝内に弾性部材を設置し、押さえ足底部内側と押さえ足辺部内側に何れもカッター取り付け溝を設ける。現有のコンピュータ糸切り平ミシン上に高低押さえ足、糸フック装置及び糸緩め電磁鉄を取り付け、縫い終わりの時に、糸フック装置がフックした上糸を挟み、続いて糸緩め電磁鉄が上糸を一度緩め、次に縫い始める時、糸フック装置が挟んだ上糸がライン上を保持していることの前庭で縫い始め、縫い針が布を貫通し、糸フック装置が挟んだ上糸は、高低押さえ足のカッターにより切断され、鳥の巣を残さないことを実現し、同時に抜糸工程を省くすることもできる。 A Chinese utility model with publication number CN20418562U discloses a bird's nest prevention device for a computer thread trimming flat sewing machine, in which the bird's nest prevention device is installed on the sewing machine body, and the bird's nest prevention device is a thread loosening electromagnetic wave. Includes iron, thread hook device and high and low presser feet. The high and low presser foot includes a presser foot head, a presser foot sole and a presser foot side part are attached to the lower end of the presser foot head, two independent rectangular posts are provided on the upper part of the presser foot side, and mounting grooves are provided inside the two rectangular posts. An elastic member is installed in the mounting groove, and cutter mounting grooves are provided both inside the presser foot sole and presser foot side. A high-low presser foot, a thread hooking device and a thread loosening electromagnetic iron are installed on the existing computerized thread trimming flat sewing machine. Once loosened, when starting to sew, the needle thread caught by the thread hook device starts sewing at the vestibule of holding on the line, the sewing needle penetrates the cloth, and the needle thread caught by the thread hook device It is cut by the cutter of the high and low presser feet, and it is possible to realize that no bird's nest is left, and at the same time, the thread removal process can be omitted.

上記2件の専利の糸切り方カッターは、何れも長方形であり、カッターと糸先端との間は、「割く」のではなく「切る」動作であり、糸先端とカッターの刃部の間に比較的大きな作用力を必要とし、ようやく糸先端を切断でき、且つこの種のカッターの刃部は直線であり、範囲は、0~180℃であり、刃部が鈍くなった後、新たなカッターに交換するしかない。また、糸フック装置は、外部に露出して設置され、作業過程において、糸先端、布、人体等の周囲の環境とフックを発生し、それにより、糸フック装置の変形を招き、装置全体の使用に影響を及ぼし、更には、比較的大きな人身財産の損失を引き起こす可能性がある。 The thread cutting cutters of the above two patents are both rectangular in shape. It requires a relatively large force to cut the end of the thread, and the blade of this kind of cutter is straight, the range is 0-180 ° C., after the blade becomes dull, a new cutter can be used. I have no choice but to replace it with In addition, the yarn hooking device is installed exposed to the outside, and in the process of working, it generates a hook with the surrounding environment such as the yarn tip, cloth, human body, etc., which causes deformation of the yarn hooking device, and the whole device. It can affect use and even cause a relatively large loss of personal property.

CN20418562U号公報CN20418562U publication

上記の現有技術に存在する問題を解決する為、本発明の目的は、ラウンドカッターの刃部が360°の円周を呈することを利用し、糸先端及びラウンドカッターの間に極小な作用力を有するだけで、糸先端を切断できるようにし、ラウンドカッターは、更には永久に使用でき、且つ糸フック装置が押さえ柄内に設置され、糸フック装置の変形を防止し、装置全体の使用を確保し、比較的大きな人身財産損失を引き起こすことを回避することができる平ミシン鳥の巣防止装置を提供することにある。 In order to solve the problems existing in the above-mentioned existing technology, the object of the present invention is to take advantage of the fact that the cutting edge of the round cutter presents a 360° circumference to create a very small acting force between the thread tip and the round cutter. The round cutter can be used permanently, and the thread hooking device is installed in the presser handle to prevent deformation of the thread hooking device and ensure the use of the whole device. To provide a flat perforated bird's nest prevention device capable of avoiding causing a relatively large personal property loss.

上記目的を達成する為、本発明の平ミシン鳥の巣防止装置は、押さえ及び押さえに枢着する押さえ柄を含み、該押さえ柄は、孔を設け、孔内に吸気管及び糸フックを設置し、該糸フックの尾部が糸フック接続板に挿入接続され、該押さえ柄の上方が接続ロッドの一端に枢着し、接続ロッドの他端は、糸フック接続板に枢着し、該押さえ柄は、気圧シリンダのシリンダ体に固定接続され、該気圧シリンダのピストンロッドは、接続ロッドの中部と枢着し、該押さえの中部に浅溝を設け、浅溝内にラウンドカッターを設置し、該押さえの2つの押さえ足の間に縫い糸を挿入可能なスリットを設置し、該ラウンドカッターの周縁刃部が一部のスリットを覆うことを特徴とする。 In order to achieve the above object, the device for preventing bird's nest on a flat sewing machine of the present invention includes a presser foot and a presser foot pivotally attached to the presser foot, the presser foot provided with a hole in which an air suction pipe and a thread hook are installed. The tail portion of the thread hook is inserted and connected to the thread hook connection plate, the upper portion of the presser shaft is pivotally attached to one end of the connection rod, the other end of the connection rod is pivotally attached to the thread hook connection plate, and the presser foot is attached to the thread hook connection plate. The handle is fixedly connected to the cylinder body of the pneumatic cylinder, the piston rod of the pneumatic cylinder is pivotally connected to the middle part of the connecting rod, the middle part of the retainer is provided with a shallow groove, and the round cutter is installed in the shallow groove; A slit into which a sewing thread can be inserted is provided between the two presser feet of the presser, and a part of the slit is covered by the peripheral edge portion of the round cutter.

前記平ミシン鳥の巣防止装置において、該押さえ柄の孔内に糸フック押さえを設置し、該糸フック押さえが糸フックに対して案内作用を形成する。 In the flat perforation bird's nest prevention device, a thread hook presser is installed in the hole of the presser handle, and the thread hook presser forms a guiding action for the thread hook.

前記平ミシン鳥の巣防止装置において、該押さえ及び押さえ柄の間に押さえバネを設置し、該押さえバネがラウンドカッターに対して位置決め作用を形成する。 In the flat perforation bird's nest prevention device, a pressing spring is installed between the pressing member and the pressing handle, and the pressing spring forms a positioning action for the round cutter.

本発明の有益効果は、ラウンドカッターの刃部が360°の円周を呈し、ラウンドカッターと糸先端の間は「切る」ではなく「割く」の動作であり、従って、糸先端及びラウンドカッターの刃部の間は、極小の作用力のみを必要とし、糸先端を切断させることができ、また、ラウンドカッターは、使用過程において、位置を回転調整することができ、従って、刃部の円周は、ただ局部に損耗を生じるのみであり、使用寿命が長く、更には、永久に使用することができる。また、糸フック装置は、押さえ柄内に設置され、作業過程において、糸先端、布、人体等の周囲の環境にフックを発生し難い。特に、厚い布を縫製する時、現有の糸フック装置は、布をストップさせ、薄い布、特に絹布を縫製し、且つレース等を縫製する要求がある時、現有の糸フック装置が加工操作の邪魔となる。しかしながら、本発明は、現在、押さえ足周辺に取り付けた糸フック装置を押さえ柄内に設置し、以上の問題を有効に解決し、それにより、糸フック装置の変形を防止し、装置全体の使用を確保し、比較的大きな人身財産の損失を引き起こすことを回避することができる。 A beneficial effect of the present invention is that the cutting edge of the round cutter presents a 360° circumference and there is a "split" rather than a "cut" action between the round cutter and the yarn tip; Only a very small force is required between the blades to cut the thread tip, and the round cutter can be rotationally adjusted during use, thus increasing the circumference of the blades. However, it is only locally worn, and has a long service life and can be used forever. In addition, the thread hooking device is installed in the presser handle, so that it is difficult for the thread tip, the cloth, the human body, and the like to be hooked in the surrounding environment during the work process. In particular, when sewing thick cloth, the existing thread hooking device can stop the cloth, and when sewing thin cloth, especially silk cloth, and sewing lace, etc., the existing thread hooking device can reduce the processing operation. get in the way. However, the present invention effectively solves the above problems by installing the thread hook device attached to the periphery of the presser foot at present in the presser foot, thereby preventing the deformation of the thread hook device and the use of the whole device. and avoid causing relatively large personal property losses.

本発明の平ミシンの鳥の巣防止装置の立体外観図である。1 is a three-dimensional external view of a bird's nest prevention device for a flat sewing machine according to the present invention; FIG. 本発明の平ミシンの鳥の巣防止装置の部分構造の立体分解図である。FIG. 2 is a three-dimensional exploded view of the partial structure of the bird's nest prevention device of the flat sewing machine of the present invention; 本発明の平ミシンの鳥の巣防止装置の押さえ及びラウンドカッターの構造関係説明図である。FIG. 4 is an explanatory diagram of the structural relationship between the retainer and the round cutter of the bird's nest prevention device of the plain sewing machine of the present invention;

先ず、図1~図3を参照し、本発明の平ミシン鳥の巣防止装置は、押さえ1及び押さえ1に枢着する押さえ柄2を含み、
前記押さえ柄2は、孔21を設け、孔21内に糸屑を吸い取ることに用いる吸気管3、及び糸フック装置の糸フック4を設置し、該糸フック4の尾部に嵌合溝42を設け、嵌合溝42により糸フック接続板5を挿入接続し、
該押さえ柄2の孔21内に糸フック押さえ41を設置し、該糸フック押さえ41は、糸フック4に対して案内作用を形成し、
該押さえ柄2の上方は、接続ロッドの一端61に枢着し、該接続ロッドの他端62は、糸フック接続板5に枢着し、
該押さえ柄2は、気圧シリンダ7のシリンダ体72を固定接続し、該気圧シリンダ7のピストンロッド71及び接続ロッド6の中部63と枢着し、ピストンロッド71により接続ロッド6、糸フック接続板5及び糸フック4の動作の変位を連動し、
該押さえ1の中に浅溝12を設け、該浅溝12内にラウンドカッター8を設置し、且つ押さえ1及び押さえ柄2の間に押さえバネ81を設置し、該押さえバネ81は、ラウンドカッター8に対して位置決め作用を形成し、
該押さえ1の2つの押さえ足14の間に縫い糸を挿入させることができるスリット11を設置し、ラウンドカッターの周縁刃部は、一部のスリット11を覆う。
First, referring to FIGS. 1 to 3, the flat sewing machine bird's nest prevention device of the present invention includes a presser foot 1 and a presser foot 2 pivotally attached to the presser foot 1,
The presser handle 2 is provided with a hole 21 in which a suction pipe 3 used for sucking up thread waste and a thread hook 4 of a thread hook device are installed. provided, the thread hook connection plate 5 is inserted and connected by the fitting groove 42,
a thread hook retainer 41 is installed in the hole 21 of the presser handle 2, the thread hook retainer 41 forming a guiding action for the thread hook 4;
The upper part of the presser handle 2 is pivotally attached to one end 61 of the connecting rod, the other end 62 of the connecting rod is pivotally attached to the thread hook connecting plate 5,
The presser foot 2 is fixedly connected to the cylinder body 72 of the pneumatic cylinder 7, and is pivotally connected to the piston rod 71 of the pneumatic cylinder 7 and the middle portion 63 of the connecting rod 6. The piston rod 71 connects the connecting rod 6 and the thread hook connecting plate. 5 and the displacement of the operation of the thread hook 4 are interlocked,
A shallow groove 12 is provided in the pressing member 1, a round cutter 8 is installed in the shallow groove 12, and a pressing spring 81 is installed between the pressing member 1 and the pressing handle 2, and the pressing spring 81 is used for the round cutter. forming a positioning action with respect to 8;
A slit 11 is provided between the two presser feet 14 of the presser foot 1 so that the sewing thread can be inserted, and the peripheral blade of the round cutter partially covers the slit 11 .

これにより、本発明の平ミシン鳥の巣防止装置は、ラウンドカッター8の周縁刃部は、押さえ1の一部のスリット11を覆い、ラウンドカッター8自身は円形を呈し、その刃部は、360°円周を呈し、ラウンドカッター8と糸先端の間は、「切る」ではなく「割く」の動作であり、従って、糸先端とラウンドカッター8の刃部の間は、ただ極小の作用力のみで、糸先端を切断させることができ、また、ラウンドカッター8は、使用過程において、位置を回転調整でき、従って、刃部の円周は、ただ局部に損耗を生じるのみであり、使用寿命が長く、更には、永久に使用することができる。また、糸フック装置は、押さえ柄2内に設置され、作業過程において、糸先端、布、人体等の周囲の環境にフックを発生し難い。特に、厚い布を縫製する時、現有の糸フック装置は、布をストップさせ、薄い布、特に絹布を縫製し、且つレース等を縫製する要求がある時、現有の糸フック装置が加工操作の邪魔となる。しかしながら、本発明は、現在、押さえ足周辺に取り付けた糸フック装置を押さえ柄2内に設置し、以上の問題を有効に解決し、それにより、糸フック装置の変形を防止し、装置全体の使用を確保し、比較的大きな人身財産の損失を引き起こすことを回避することができる。 As a result, in the device for preventing birds' nests on flat sewing machines of the present invention, the peripheral edge portion of the round cutter 8 covers a part of the slit 11 of the presser foot 1, the round cutter 8 itself exhibits a circular shape, and the blade portion is 360 mm wide. , the action between the round cutter 8 and the thread tip is "split" instead of "cutting", therefore, between the thread tip and the blade of the round cutter 8, there is only a very small acting force. In addition, the position of the round cutter 8 can be adjusted by rotation during use, so the circumference of the blade is only locally worn, and the service life is shortened. It can be used for a long time, even permanently. In addition, the thread hooking device is installed in the presser handle 2, and during the work process, it is difficult for hooks to occur in the surrounding environment such as the thread tip, the cloth, the human body, and the like. In particular, when sewing thick cloth, the existing thread hooking device can stop the cloth, and when sewing thin cloth, especially silk cloth, and sewing lace, etc., the existing thread hooking device can reduce the processing operation. get in the way. However, the present invention effectively solves the above problems by installing the thread hooking device attached around the presser foot in the presser foot 2, thereby preventing the deformation of the thread hooking device and preventing the entire device from being deformed. It can ensure the use and avoid causing relatively large loss of personal property.

なお、本発明では好ましい実施例を前述の通り開示したが、これらは決して本発明に限定するものではなく、当該技術を熟知する者なら誰でも、本発明の精神と領域を脱しない均等の範囲内で各種の変動や潤色を加えることができることは勿論である。 It should be noted that although the present invention has disclosed preferred embodiments as described above, these are not intended to limit the invention in any way, and any person skilled in the art will be able to apply equivalents that do not depart from the spirit and scope of the invention. Of course, various variations and embellishments can be added within.

1 押さえ
11 スリット
12 浅溝
14 押さえ足
2 押さえ柄
21 孔
3 吸引管
4 糸フック
41 糸フック押さえ
42 嵌合溝
5 糸フック接続板
6 接続ロッド
61 一端
62 他端
63 中部
7 気圧シリンダ
71 ピストンロッド
8 ラウンドカッター
81 押さえバネ
1 Presser 11 Slit 12 Shallow groove 14 Presser foot 2 Presser handle 21 Hole 3 Suction tube 4 Thread hook 41 Thread hook presser 42 Fitting groove 5 Thread hook connection plate 6 Connecting rod 61 One end 62 The other end 63 Central part 7 Pneumatic cylinder 71 Piston rod 8 Round cutter 81 Holding spring

Claims (3)

押さえ及び押さえに枢着する押さえ柄を含み、該押さえ柄は、孔を設け、孔内に吸気管及び糸フックを設置し、該糸フックの尾部が糸フック接続板に挿入接続され、該押さえ柄の上方が接続ロッドの一端に枢着し、接続ロッドの他端は、糸フック接続板に枢着し、該押さえ柄は、気圧シリンダのシリンダ体に固定接続され、該気圧シリンダのピストンロッドは、接続ロッドの中部と枢着し、該押さえの中部に浅溝を設け、浅溝内にラウンドカッターを設置し、該押さえの2つの押さえ足の間に縫い糸を挿入可能なスリットを設置し、該ラウンドカッターの周縁刃部が一部のスリットを覆うことを特徴とする平ミシン鳥の巣防止装置。 a presser foot and a presser handle pivotally attached to the presser foot, the presser handle is provided with a hole in which the suction pipe and the thread hook are installed; the tail of the thread hook is inserted and connected to the thread hook connection plate; The upper part of the handle is pivotally attached to one end of the connecting rod, the other end of the connecting rod is pivotally attached to the thread hook connecting plate, the holding handle is fixedly connected to the cylinder body of the pneumatic cylinder, and the piston rod of the pneumatic cylinder. is pivotally connected to the middle part of the connecting rod, a shallow groove is provided in the middle part of the presser, a round cutter is installed in the shallow groove, and a slit is installed between the two presser feet of the presser so that a sewing thread can be inserted. 1. A bird's nest prevention device for a flat sewing machine, wherein the peripheral cutting edge of the round cutter partially covers the slit. 前記押さえ柄の孔内に糸フック押さえを設置し、該糸フック押さえが糸フックに対して案内作用を形成する請求項1に記載の平ミシン鳥の巣防止装置。 2. A bird's nest prevention device according to claim 1, wherein a thread hook retainer is located within said hold down handle hole, said thread hook retainer forming a guide for said thread hook. 前記押さえ及び押さえ柄の間に押さえバネを設置し、該押さえバネがラウンドカッターに対して位置決め作用を形成する請求項1に記載の平ミシン鳥の巣防止装置。 2. A bird's nest prevention device for a flat sewing machine according to claim 1, wherein a hold-down spring is installed between said hold-down and a hold-down shank, said hold-down spring forming a positioning action for the round cutter.
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