JP4247097B2 - Eyelet hole sewing machine - Google Patents

Eyelet hole sewing machine Download PDF

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JP4247097B2
JP4247097B2 JP2003387710A JP2003387710A JP4247097B2 JP 4247097 B2 JP4247097 B2 JP 4247097B2 JP 2003387710 A JP2003387710 A JP 2003387710A JP 2003387710 A JP2003387710 A JP 2003387710A JP 4247097 B2 JP4247097 B2 JP 4247097B2
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thread
lower thread
sewing
bobbin
looper
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JP2005143950A (en
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健二 村井
伸介 松橋
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Juki Corp
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本発明は、必要に応じて下糸のたぐり出しを行う鳩目穴かがりミシンに関する。   The present invention relates to an eyelet-punching sewing machine that pulls out a bobbin thread as necessary.

従来の鳩目穴かがりミシンは、上糸を縫製対象物である布地に挿通する縫い針を支持する針棒と、針棒の上下動を行う上下動機構と、針棒の揺動を行う揺動機構と、上糸を捕捉するルーパと上糸ループを広げて下糸と係合させるスプレッダと針板とを支持するルーパ土台と、下糸に抵抗力を付与する糸調子機構と、ルーパ土台に設けられると共に下糸を糸供給源からたぐり出す糸たぐり機構と、布台により布地を載置保持すると共に縫製位置から移動動作を行う布保持機構と、上糸切断機構と、下糸切断機構とを備えている(例えば、特許文献1参照)。
上記鳩目穴かがりミシンにあっては、縫い針が縫製時に上下動及び揺動を行いつつも垂直上下方向を中心に回動可能に支持されており、これに伴い、ルーパ土台も縫い針と同心で回動動作を可能としている。
A conventional eyelet sewing machine has a needle bar that supports a sewing needle that passes an upper thread through a cloth that is a sewing object, a vertical movement mechanism that moves the needle bar up and down, and a swing that swings the needle bar. A mechanism, a looper that catches the upper thread, a spreader base that spreads the upper thread loop and engages the lower thread, and a needle plate, a thread tension mechanism that provides resistance to the lower thread, and a looper base A thread pulling mechanism that pulls out the lower thread from the thread supply source, a cloth holding mechanism that places and holds the cloth by the cloth base and moves from the sewing position, an upper thread cutting mechanism, and a lower thread cutting mechanism; (For example, refer to Patent Document 1).
In the above-mentioned eyelet sewing machine, the sewing needle is supported so as to be rotatable about the vertical vertical direction while moving up and down during sewing, and accordingly, the looper base is also concentric with the sewing needle. Can be rotated.

図6(A)は、下糸D及び上糸Uにより形成される鳩目穴かがり縫製における適正な縫い状態を示す説明図である。鳩目穴は、図示の如く、その形状が、水滴形状となる部分と当該水滴形状部分の尖端部から引き出された直線状となる部分とから構成される。
上記鳩目穴かがりミシンにあっては、鳩目穴の周囲に沿って穴かがり縫いを行う場合に、直線状部に沿ってその片側で縫製を行い、次いで、水滴形状部を周回して縫製を行い、直線状部のもう一方の片側に沿って縫製を行って完了する。そして、水滴形状部に沿って周回移動する際に、縫い針とルーパ土台の回動動作が行われる。
FIG. 6 (A) is an explanatory diagram showing an appropriate sewing state in the eyelet stitching formed by the lower thread D and the upper thread U. FIG. As shown in the figure, the eyelet hole is composed of a portion having a water droplet shape and a linear portion drawn from the tip of the water droplet shape portion.
In the above-mentioned eyelet-holed sewing machine, when carrying out hole-sewing along the periphery of the eyelet-hole, sewing is performed on one side along the linear part, and then, sewing is performed around the waterdrop-shaped part. Then, sewing is completed along the other side of the linear portion. Then, when the circling movement is performed along the water droplet shape portion, the sewing needle and the looper base are rotated.

さらに、縫製完了後には、布地を載置保持する布台が針板上から若干移動され、まず、上糸の切断が行われる。このとき、糸たぐり機構は上糸切断機構と連動するように構成され、上糸切断と同時に下糸のたぐり出しが行われる。また、糸たぐり機構は、糸調子機構による下糸の解放と連動するように構成されているため、糸たぐりの際には糸調子機構による抵抗力は付与されず、フリーな状態で糸供給源から糸のたぐり出しが行われる。   Further, after the sewing is completed, the cloth base for placing and holding the cloth is slightly moved from the needle plate, and the upper thread is first cut. At this time, the yarn threading mechanism is configured to be interlocked with the upper thread cutting mechanism, and the lower thread is pulled out simultaneously with the upper thread cutting. Further, since the thread pulling mechanism is configured to be interlocked with the bobbin thread release by the thread tension mechanism, the resistance of the thread tension mechanism is not applied during thread pulling, and the thread supply source is free. The thread is pulled out from the thread.

そして、下糸の切断動作に移行する。下糸の切断に際しては、上糸切断の場合よりも布台が大きく移動を行う。これにより、下糸は、針板の中央に設けられた縫い針挿入穴から大きく移動した位置まで引き出された状態となる。そして、下糸切断機構の可動メスが引き出された状態の下糸を薙いでさらに固定メスまで引き出させながら切断を行う。
このように、下糸切断時には、下糸が、布地の移動と糸切りにより引き出されることになるが、糸たぐり機構は、この時消費される下糸を予め下糸供給源からたぐり出すように動作する。
特開2001−334091号公報
Then, the process proceeds to a lower thread cutting operation. When cutting the lower thread, the cloth base moves more than when cutting the upper thread. As a result, the lower thread is pulled out to a position greatly moved from the sewing needle insertion hole provided in the center of the needle plate. Then, cutting is performed while scooping the lower thread with the movable knife of the lower thread cutting mechanism being pulled out and further pulling out to the fixed knife.
In this way, when the lower thread is cut, the lower thread is pulled out by the movement of the fabric and the thread trimming. However, the thread pulling mechanism pulls out the lower thread consumed at this time from the lower thread supply source in advance. Operate.
JP 2001-334091 A

しかしながら、鳩目穴かがり縫製にあっては、下糸張力を比較的緩やかに設定して、下糸に形成される環状部分を大きく形成する場合があるが、このような場合、従来の鳩目穴かがりミシンでは、下糸切断時に、図6(B)に示すように終端側の環状部Nが押しつぶされたように変形してしまうという問題が生じていた。
本来、下糸切断時に消費される下糸は、上記したように下糸切断前に予め下糸たぐり機構によりたぐり出されるため、このような問題は、発生しないはずであるが、実際は、次のような理由により発生する。
上記したように下糸の切断は、可動メスが引き出された状態の下糸を薙いで、さらに固定メスまで引き出しながら切断を行うことにより行われる。この時消費される下糸が全て予め下糸たぐり機構により引き出されていると、下糸が切断される際に下糸に全く張力が掛からず下糸が切断できないため、下糸たぐり機構は、下糸切断の際に必要最小限の張力が下糸にかかるように、下糸切断機構が消費する下糸の量よりも若干少ない下糸を繰り出すように構成されている。
そして、下糸切断の際には、糸調子機構に対して下糸を解放する制御が行われるが、不足する下糸が下糸切断機構から下糸供給源に到る経路に沿って引き出されることにより、この経路に沿った摺動摩擦抵抗などと糸駒から下糸を引き出すための低抗等によって下糸に張力が働き、この張力により下糸が張られて下糸が切断される。
通常の縫製においては、この不足する下糸は、下糸の供給源側から引き出されるため、図6(A)に示すようにきれいな縫い目が形成される。
しかしながら、上記したように、下糸張力を比較的緩やかに設定して、下糸により形成される環状部分を大きく形成する場合には、不足分の下糸は、布側から引き出されることになり、その結果、図6(B)に示す変形した縫い目Nが形成されてしまう。これは、下糸切断機構の可動メスにより不足分の下糸が引き出される際に、可動メスを挟んで、糸供給源の下糸と布側の下糸との引き合いが行われるが、環状縫い目が緩い下糸張力で形成されているため、糸調子機構による張力が付与されない状態であっても、布側の下糸が糸供給源側の下糸に引っ張られてしまうことに起因している。
However, in the case of eyelet stitching, there is a case where the lower thread tension is set relatively moderately and the annular portion formed in the lower thread is formed to be large. The sewing machine has a problem that when the lower thread is cut, the annular portion N on the terminal end side is deformed as shown in FIG. 6B.
Originally, the lower thread consumed when lower thread is cut out by the lower thread pulling mechanism in advance before cutting the lower thread as described above, such a problem should not occur. It occurs for the following reasons.
As described above, the lower thread is cut by scooping the lower thread in a state in which the movable knife is pulled out, and further cutting it while pulling it out to the fixed knife. If all of the lower thread consumed at this time has been pulled out by the lower thread pulling mechanism in advance, the lower thread cannot be cut because no tension is applied to the lower thread when the lower thread is cut. The lower yarn is fed out slightly less than the amount of lower yarn consumed by the lower yarn cutting mechanism so that the minimum necessary tension is applied to the lower yarn at the time of lower yarn cutting.
At the time of lower thread cutting, control is performed to release the lower thread to the thread tension mechanism, but the insufficient lower thread is pulled out along the path from the lower thread cutting mechanism to the lower thread supply source. As a result, tension is exerted on the lower thread by sliding frictional resistance along this path and resistance for pulling out the lower thread from the yarn spool, and the lower thread is stretched by this tension and the lower thread is cut.
In normal sewing, the insufficient lower thread is pulled out from the lower thread supply source side, so that a beautiful seam is formed as shown in FIG.
However, as described above, when the lower thread tension is set relatively moderately and the annular portion formed by the lower thread is formed to be large, the insufficient lower thread is pulled out from the cloth side. As a result, the deformed seam N shown in FIG. 6B is formed. This is because when the lower thread of the shortage is pulled out by the movable knife of the lower thread cutting mechanism, the lower thread of the thread supply source and the lower thread of the fabric side are attracted with the movable knife interposed therebetween, but the annular seam This is because the lower thread on the fabric side is pulled by the lower thread on the thread supply source side even when the tension by the thread tension mechanism is not applied. .

また、鳩目穴かがりミシンは、ボタン穴かがり専用ミシンであり、他の工程に転用しにくいことから、多くの縫製品目に対してミシンが共用される為、多品種少量生産に対応して、下糸の両端に鍔のある小型の糸駒R1(図7(A))が使用される場合がある。この糸駒を使用する場合も、通常の糸駒R2(図7(B))のように上方から糸を引き出して使用するが、上端の鍔Tと下糸との接触により、下糸の引き出しに大きな張力が必要とされ、このような場合においても、環状縫い目部形成時の下糸張力を緩くした場合と同様に、下糸切断の際に布側から下糸が引き出され変形した縫い目Nが形成されてしまうという問題があった。
さらに、滑りやすい下糸を使用した場合においても、同様な問題が発生することがあった。
本発明は、下糸切断時に布側から下糸が引き出されることを防止して、きれいな穴かがり縫い目を形成できるとともに、確実に下糸が切断できる鳩目穴かかりミシンを提供することを目的とする。
In addition, the eyelet sewing machine is a buttonhole sewing machine that is difficult to divert to other processes, so the sewing machine is shared for many sewing products. In some cases, a small thread spool R1 (FIG. 7 (A)) having hooks at both ends of the thread is used. When using this thread spool, the thread is pulled out from above as in the normal thread spool R2 (FIG. 7B), but the lower thread is pulled out by contact between the upper end heel T and the lower thread. In such a case, as in the case where the lower thread tension at the time of forming the circular seam portion is loosened, the lower thread is pulled out from the cloth side when the lower thread is cut, and the deformed seam N There was a problem that would be formed.
Furthermore, the same problem may occur even when a slippery lower thread is used.
SUMMARY OF THE INVENTION An object of the present invention is to provide a perforated hole sewing machine that can prevent a lower thread from being pulled out from the fabric side when cutting the lower thread, and can form a clean holed seam and can reliably cut the lower thread. .

請求項1記載の発明は、上糸が通される縫い針を支持する針棒と、下糸が通されるルーパを上部において支持すると共に、針棒と共に上下方向を中心に回動するルーパ土台と、ルーパ土台に回動力を伝達する回動軸と、回動軸の軸線に沿って設けられ、下糸供給源から下糸をルーパに案内する下糸案内部材と、下糸案内部材とルーパとの間に設けられ、下糸をたぐって弛みを付与する第一の下糸たぐり手段と、下糸供給源から下糸案内部材の間に設けられ、下糸の送りに抵抗力を付与する糸調子手段と、縫製終了後にルーパから布に連なる下糸を切断する下糸切断手段と備えた鳩目穴かがりミシンにおいて、下糸供給源から糸調子手段までの下糸経路中に、縫製終了後から下糸切断手段により下糸が切断されるまでの間に、下糸を下糸供給源からたぐり出す第二の下糸たぐり手段を設ける、という構成を採っている。   According to the first aspect of the present invention, there is provided a needle bar for supporting a sewing needle through which an upper thread is passed, and a looper base that supports a looper through which a lower thread is passed at the upper part and rotates around the needle bar together with the needle bar. A rotation shaft that transmits rotational force to the looper base, a lower thread guide member that is provided along the axis of the rotation shaft and guides the lower thread from the lower thread supply source to the looper, a lower thread guide member, and a looper Between the first bobbin thread pulling means for slacking the bobbin thread and providing a slack, and between the bobbin thread supply source and the bobbin thread guide member, and imparting resistance to the bobbin thread feed. After the end of sewing, in a thread thread sewing machine equipped with a thread tension means and a lower thread cutting means provided with a lower thread cutting means for cutting the lower thread connected to the cloth from the looper after the sewing is completed, in the lower thread path from the lower thread supply source to the thread tension means. Until the lower thread is cut by the lower thread cutting means. Second providing the lower thread drawing means issuing Rataguri, it adopts a configuration that.

上記構成では、針棒とルーパの協働により上糸と下糸とからなるかがり縫い縫製が行われる。そして、鳩目穴の円弧形状部における縫製時には、針棒とルーパ土台とが同軸で回動することで、円弧形状に従って縫製が行われる。また、縫製継続時には、糸調子手段により下糸には適正な張力付与が行われる。
そして、鳩目穴周囲の縫製が終わると、下糸の引き出しや切断により消費される下糸の供給にために第一と第二のそれぞれの下糸たぐり手段により下糸のたぐり出しが行われる。
In the above-described configuration, the overlock sewing including the upper thread and the lower thread is performed by the cooperation of the needle bar and the looper. At the time of sewing in the arc-shaped portion of the eyelet hole, the needle bar and the looper base are rotated coaxially so that sewing is performed according to the arc shape. Further, when sewing is continued, an appropriate tension is applied to the lower thread by the thread tension means.
Then, when the sewing around the eyelet ends, the lower thread is pulled out by the first and second lower thread pulling means in order to supply the lower thread that is consumed by drawing and cutting the lower thread.

この時、第二の下糸たぐり手段により下糸供給源からたぐり出された下糸は、糸調子手段より上流側に弛んだ状態で蓄えておけるので、下糸切断手段が下糸を切断する際には、糸調子手段より上流の下糸を引き出すのに要する張力を充分に低減することができる。従って、下糸の切断時に可動メスが下糸を薙くときには、上糸供給源の下糸を引き出すのに要する張力を小さくすることができ、下糸切断の際に不足する下糸が布側から引き出されるのを防止して、確実に下糸供給源から引き出すことできる。
また、下糸切断時に要する最小限の張力は、第二の下糸たぐり手段の下流側に介在する糸調子手段等により確保される。
At this time, the bobbin thread that has been pulled out from the bobbin thread supply source by the second bobbin thread boring means can be stored in a slack state upstream from the thread tension means, so that the bobbin thread cutting means cuts the bobbin thread. In this case, the tension required to draw the lower thread upstream from the thread tension means can be sufficiently reduced. Therefore, when the movable knife whirls the lower thread when cutting the lower thread, the tension required to pull out the lower thread from the upper thread supply source can be reduced, and the lower thread that is insufficient when cutting the lower thread Can be prevented from being pulled out from the lower thread supply source.
In addition, the minimum tension required for cutting the lower thread is ensured by a thread tension means or the like interposed downstream of the second lower thread pulling means.

請求項2記載の発明は、請求項1記載の発明と同様の構成を備えると共に、第二の下糸たぐり手段は、そのたぐり出し動作を開始させる作動部材を第一の下糸たぐり手段と共用する、という構成を採っている。
かかる構成により、一の作動部材に対する制御により二つの下糸たぐり手段の動作を実行させることができ、制御回路の簡易化或いは制御に伴う処理の簡易化が図られる。
The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the second bobbin thread pulling means shares the operating member for starting the boring operation with the first bobbin thread boring means. It has a configuration of “Yes”.
With this configuration, the operation of the two lower thread pulling means can be executed by controlling one operation member, and the control circuit can be simplified or the processing associated with the control can be simplified.

請求項3記載の発明は、請求項1記載の発明と同様の構成を備えると共に、第二の下糸たぐり手段は、第一の下糸たぐり手段と異なるタイミングでたぐり出し動作を行うと共に、第二の下糸たぐり手段のたぐり出し動作の際に、糸調子手段がルーパ側からの下糸の繰り出しを阻止する抵抗力を下糸に付与するように制御を行う動作制御手段を備える、という構成を採っている。
上記構成では、第二の下糸たぐり手段による糸たぐりにおいて、糸調子手段が下流側からの糸のたぐり出しを規制することで糸たぐり時における布地側への影響をより効果的に回避する。
The invention described in claim 3 has the same configuration as that of the invention described in claim 1, and the second bobbin thread pulling means performs a boring operation at a different timing from the first bobbin thread pulling means, and A configuration in which operation control means is provided for performing control so that the yarn tensioning means applies a resistance force to the lower thread to prevent the lower thread from being fed out from the looper side when the two lower thread pulling means are pulled out. Is adopted.
In the above-described configuration, the yarn tensioning means regulates the yarn from the downstream side in the yarn threading by the second lower thread threading means, so that the influence on the fabric side at the time of threading is more effectively avoided.

請求項1記載の発明は、糸調子手段よりも布地に対して下糸供給源側に位置している第二の下糸たぐり手段を備えていることから、糸調子手段より上流側に弛んだ状態で下糸を蓄えておけるので、下糸切断手段が下糸を切断する際には、糸調子手段より上流の下糸を引き出すのに要する張力を充分に低減することができる。
その一方で、下糸切断時に要する最小限の張力は、下糸切断手段から糸調子手段に到る下糸の経路において、下糸に働く摺動摩擦抵抗により確保される。
このため、下糸の切断時に可動メスが下糸を薙くときには、上糸供給源の下糸を引き出すのに要する張力を小さくすることができ、下糸切断の際に不足する下糸が布側から引き出されるのを防止して、確実に下糸供給源から引き出すと共に、良好に切断を行うことが可能となる。
The invention according to claim 1 is provided with the second lower thread bobbin threading means positioned on the lower thread supply source side with respect to the fabric than the thread tension means, so that it is loosened upstream from the thread tension means. Since the lower thread can be stored in the state, when the lower thread cutting means cuts the lower thread, the tension required to draw the lower thread upstream from the thread tension means can be sufficiently reduced.
On the other hand, the minimum tension required for lower thread cutting is ensured by the sliding frictional resistance acting on the lower thread in the lower thread path from the lower thread cutting means to the thread tension means.
For this reason, when the movable knife whirls the lower thread when cutting the lower thread, the tension required to pull out the lower thread from the upper thread supply source can be reduced, and the lower thread that is insufficient when cutting the lower thread It can be prevented from being pulled out from the side, reliably pulled out from the lower thread supply source, and can be cut well.

従って、布地側から下糸をたぐり出すという事態を回避し、縫製された下糸の締め付けによる縫製形状の変形を防止し、例え、両端に鍔を有する下糸用の糸駒(図7(A)参照)を使用する場合や、滑りやすい下糸を使用した場合であっても、縫い品質を高く維持することが可能となる。
さらに、第二の下糸たぐり手段は、糸調子手段よりも上流側に配置することから、第二の下糸たぐり手段での糸たぐり量が過剰な場合であっても、次の縫製時には、糸調子手段により縫製に必要な適正な張力が与えられるので、縫い品質に影響を与えることがない。
Therefore, the situation where the bobbin thread is pulled out from the fabric side is avoided, and the deformation of the sewing shape due to the tightening of the sewn bobbin thread is prevented. ))) Or when using a slippery lower thread, the sewing quality can be maintained high.
Further, since the second bobbin thread lifting means is arranged on the upstream side of the thread tension means, even when the amount of thread bouncing in the second bobbin thread lifting means is excessive, at the time of the next sewing, Since the proper tension necessary for sewing is given by the thread tension means, the sewing quality is not affected.

請求項2記載の発明は、第一の下糸たぐり手段と第二の下糸たぐり手段とで作動部材を共用することから、制御対象物が一つとなり、制御プログラムや制御回路の簡易化、単純化を図ることが可能となる。また、これにより、コスト低減や生産性向上を図ることが可能となる。さらに、制御の高速化が可能となる。   In the invention according to claim 2, since the operating member is shared by the first lower thread lifting means and the second lower thread lifting means, the control object becomes one, simplification of the control program and the control circuit, Simplification can be achieved. This also makes it possible to reduce costs and improve productivity. Further, the control can be speeded up.

請求項3記載の発明は、第二の下糸たぐり手段による糸たぐりにおいて、糸調子手段が下流側からの糸のたぐり出しを規制するため、より効果的に布地側からの下糸のたぐり出しを回避することが可能となり、さらなる縫い品質の向上を図ることが可能となる。   According to the third aspect of the present invention, in the yarn threading by the second bobbin thread unwinding means, the thread tension means regulates the unwinding of the thread from the downstream side, so that the bobbin thread unwinding from the fabric side more effectively. Can be avoided, and the sewing quality can be further improved.

(実施形態の全体構成)
本発明の実施形態たる鳩目穴かがりミシン10を図1乃至図5に基づいて説明する。図1は鳩目穴かがりミシン10の一部切り欠いた側面図である。かかる図1に示すように、鳩目穴かがりミシン10は、ミシン全体において下部に位置すると共に略矩形箱状をなすベッド部2aと、該ベッド部2aの一端部に設けられた縦胴部2bと、該縦胴部2bからベッド部2aと同方向に延出して設けられたアーム部2cとを備えたミシンフレーム2を備えている。なお、以下の説明において、垂直上下方向をZ軸方向とし、ベッド部2a及びアーム部2cの長手方向をY軸方向とし、Y軸方向とZ軸方向の双方に直交する方向をX軸方向とする。
(Overall configuration of the embodiment)
An eyelet-punching sewing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view in which the eyelet-cutting sewing machine 10 is partially cut away. As shown in FIG. 1, the eyelet-punching sewing machine 10 includes a bed portion 2a that is located at the lower part of the whole sewing machine and has a substantially rectangular box shape, and a vertical body portion 2b provided at one end of the bed portion 2a. The sewing machine frame 2 includes an arm portion 2c that extends from the vertical body portion 2b in the same direction as the bed portion 2a. In the following description, the vertical vertical direction is the Z-axis direction, the longitudinal direction of the bed portion 2a and the arm portion 2c is the Y-axis direction, and the direction orthogonal to both the Y-axis direction and the Z-axis direction is the X-axis direction. To do.

図2は下糸経路中にある鳩目穴かがりミシン10の各構成を正面方向から見た構成図、図3は図2と同じ構成を側面方向から見た構成図、図4はミシンのベッド部上面における針板周囲の構成を示す平面図である。なお、図4はベッド部2aの上面カバーの図示を省略している。
図1乃至図4に示すように、鳩目穴かがりミシン10は、上糸を縫製対象物である布地Cに挿通する縫い針11を支持する針棒12と、針棒12の上下動を行う図示しない上下動機構と、針棒12の揺動を行う図示しない揺動機構と、上糸を捕捉するルーパ21,22と上糸ループを広げて下糸と係合させるスプレッダ23,24と針板25とをその上部において保持するルーパ土台20と、下糸供給源から繰り出される下糸に抵抗力を付与する糸調子手段40と、下糸を糸供給源からたぐり出す第一及び第二の下糸たぐり手段50、60と、布台71により布地Cを載置保持すると共に縫製位置から移動動作を行う布保持機構70と、縫製終了後に上糸を切断する図示しない上糸切断手段と、縫製終了後に下糸を切断する下糸切断手段80と、切断後の下糸端部を保持する下糸保持手段14とを備えている。
FIG. 2 is a configuration diagram of each configuration of the eyelet-raised sewing machine 10 in the bobbin thread path as viewed from the front direction, FIG. 3 is a configuration diagram of the same configuration as that in FIG. 2 viewed from the side direction, and FIG. It is a top view which shows the structure around the needle plate in the upper surface. In FIG. 4, the illustration of the upper surface cover of the bed portion 2a is omitted.
As shown in FIGS. 1 to 4, the eyelet sewing machine 10 includes a needle bar 12 that supports a sewing needle 11 that passes an upper thread through a cloth C that is a sewing object, and a needle bar 12 that moves up and down. Up and down movement mechanism, a swing mechanism (not shown) that swings the needle bar 12, loopers 21 and 22 that catch the upper thread, spreaders 23 and 24 that widen the upper thread loop and engage with the lower thread, and the needle plate A looper base 20 that holds the lower thread 25 at its upper part, a thread tension means 40 that provides resistance to the lower thread fed from the lower thread supply source, and first and second lower threads that pull out the lower thread from the thread supply source. Thread take-up means 50, 60, cloth holding mechanism 70 for placing and holding cloth C by cloth stand 71 and moving from the sewing position, upper thread cutting means (not shown) for cutting the upper thread after the end of sewing, sewing Lower thread cutting means 80 for cutting the lower thread after completion And a lower thread holding means 14 for holding the lower yarn end after cutting.

(針棒、上下動機構及び揺動機構)
針棒12は、アーム部2cの一端部においてZ軸方向に沿って装備され、縫製時には周知の上下動機構及び揺動機構により先端の縫い針をX軸方向に沿って揺動させながら上下動を行う。上下動機構及び揺動機構は、いずれも図示しないミシンモータにより駆動される上軸からその上下動及び揺動の駆動力を付与される。また、上下動と揺動とは同期して行われ、これにより、布地Cに対してX軸方向に一定の幅で針振りを行いながらかがり縫い縫製が行われる。
(Needle bar, vertical movement mechanism and swing mechanism)
The needle bar 12 is provided along the Z-axis direction at one end of the arm portion 2c, and moves up and down while swinging the sewing needle at the tip along the X-axis direction by a well-known vertical movement mechanism and swing mechanism during sewing. I do. Both the vertical movement mechanism and the swing mechanism are given drive force for their vertical movement and swing from an upper shaft driven by a sewing machine motor (not shown). Further, the vertical movement and the swinging are performed in synchronism with each other, and by this, over stitch sewing is performed while performing needle swinging on the fabric C with a certain width in the X-axis direction.

さらに、針棒12は、上下動駆動力と揺動駆動力が付与されつつも、図示しないミシンフレームによってZ軸方向に沿った状態における当該針棒12を中心として回動可能に支持されている。そして、針棒12は、縫製時にタイミングベルト13を介して、後述するルーパ土台20と同期して回動力が付与される。即ち、かかる構成により、鳩目穴の水滴形状部の円弧形状に沿ってかがり縫い縫製を行うことを可能としている。   Further, the needle bar 12 is supported by a sewing machine frame (not shown) so as to be rotatable about the needle bar 12 in the state along the Z-axis direction while being provided with a vertical driving force and a swinging driving force. . Then, the needle bar 12 is applied with a rotational force in synchronism with a looper base 20 described later via a timing belt 13 during sewing. That is, with this configuration, it is possible to perform overlock sewing along the arc shape of the water drop shape portion of the eyelet hole.

(布保持機構)
布保持機構70は、ヘッド部2aの上面に設けられ布地Cが載置される布台71と、布台71に連結されたアーム72を介して布台71に載置された布地Cを上から押圧して保持する布押え73と、ベッド部2a内に設けられ布台71をX軸方向及びY軸方向に水平移動させる図示しない駆動手段とを備えている。上記布台71は、駆動手段により駆動されて上面に載置された布地Cの穴かがり位置を針板25の縫製位置から針板25の上方から完全に離れた待避位置(図4の位置)まで移動させるように駆動手段により水平移動される。
また、布台71は、そのX軸方向中間部においてY軸方向に沿って分断部分が形成されており、縫製時には当該分断部分に針落ちが行われる。即ち、布台71上にセットされた布地Cに対して、分断部分の範囲で縫製が行われる。
(Cloth holding mechanism)
The cloth holding mechanism 70 moves up the cloth C placed on the cloth base 71 via a cloth base 71 provided on the upper surface of the head portion 2 a and on which the cloth C is placed, and an arm 72 connected to the cloth base 71. And a driving means (not shown) provided in the bed portion 2a for horizontally moving the cloth base 71 in the X-axis direction and the Y-axis direction. The cloth stand 71 is driven by a driving means and is a retracted position (position shown in FIG. 4) in which the hole position of the cloth C placed on the upper surface is completely separated from the sewing position of the needle plate 25 from above the needle plate 25. It is horizontally moved by the driving means so as to move up to.
Further, the cloth base 71 is formed with a divided portion along the Y-axis direction at the intermediate portion in the X-axis direction, and needle dropping is performed on the divided portion at the time of sewing. That is, the cloth C set on the cloth base 71 is sewn within the range of the divided portion.

駆動手段は、例えば、その駆動量が制御可能なサーボモータ或いはステッピングモータであり、これにより、布台71を介して縫製時の布送りを行うことを可能としている。
布押さえ73は、図示しないアクチュエータにより布台71に対して押圧接触する布押さえ位置と、布台71から離間した解放位置とに切り替え可能となっている。
The drive means is, for example, a servo motor or a stepping motor whose drive amount can be controlled, and this enables cloth feed during sewing via the cloth base 71.
The cloth presser 73 can be switched between a cloth press position that is pressed against the cloth base 71 by an actuator (not shown) and a release position that is separated from the cloth base 71.

(ルーパ土台)
ルーパ土台20は、ベッド部2aの針棒12の下方の位置において、ミシンフレームによりZ軸方向を中心に回動可能に支持されている。このルーパ土台20は、後述する各種の構成を支持する本体部26と、本体部26の下部から延出した状態で固定装備された回動軸部27とを備えている。
(Looper base)
The looper base 20 is supported at a position below the needle bar 12 of the bed portion 2a so as to be rotatable about the Z-axis direction by a sewing machine frame. The looper base 20 includes a main body portion 26 that supports various configurations described later, and a rotating shaft portion 27 that is fixedly mounted in a state of extending from the lower portion of the main body portion 26.

ルーパ土台20は、ベッド部2a内においてミシンフレームにより、回動軸部27がZ軸方向に沿った状態で且つ当該回動軸部27の軸線を中心に回動可能に支持される。なお、この回動軸部27と前述した針棒12とは、当該針棒12が、その揺動範囲内でZ軸方向に沿った方向を向いたときに、互いの中心軸線が同軸となるように相互の配置が設定されている。
そして、回動軸部27には従動プーリ27aが装備され、図示しないタイミングベルトを介してステッピングモータによりルーパ土台20の回動駆動力が付与される。なお、ルーパ土台20の駆動源たるステッピングモータは、前述した針棒12の回動駆動源でもあり、これらを同期させて同じ回転速度で回転駆動させる。
The looper base 20 is supported by the sewing machine frame in the bed portion 2a so as to be rotatable about the axis of the rotation shaft portion 27 in a state where the rotation shaft portion 27 is along the Z-axis direction. The rotating shaft 27 and the needle bar 12 described above are coaxial with respect to each other when the needle bar 12 faces the direction along the Z-axis direction within the swing range. The mutual arrangement is set as follows.
The rotation shaft portion 27 is provided with a driven pulley 27a, and a rotation driving force of the looper base 20 is applied by a stepping motor via a timing belt (not shown). Note that the stepping motor as a drive source of the looper base 20 is also a rotational drive source of the needle bar 12 described above, and these are driven to rotate at the same rotational speed in synchronization.

また、回動軸部27は筒状体であり、その内側に筒状のルーパ駆動軸28が挿入装備され、さらにルーパ駆動軸28の内側にはスプレッダ駆動軸29が挿入装備される。これらルーパ駆動軸28とスプレッダ駆動軸29とは、いずれも回動軸部27と同心であり、当該回動軸部27に対して個別に回転可能な状態で支持されている。そして、これらルーパ駆動軸28及びスプレッダ駆動軸29は、それぞれ下端部にて前述した上軸と同期回転する下軸により回転駆動力が入力される一方で、それぞれ上端部にて図示しないカム機構によりルーパ21,22とスプレッダ23,24とに対して揺動駆動力を伝達する。即ち、これにより、ルーパ21,22とスプレッダ23,24とは、それぞれ位相を異ならせつつも針棒12の上下動周期と同期して揺動駆動し、縫製における所定の動作を実行する。   Further, the rotation shaft portion 27 is a cylindrical body, and a cylindrical looper drive shaft 28 is inserted and installed inside thereof, and a spreader drive shaft 29 is inserted and installed inside the looper drive shaft 28. The looper drive shaft 28 and the spreader drive shaft 29 are both concentric with the rotation shaft portion 27 and are supported in a state of being individually rotatable with respect to the rotation shaft portion 27. The looper drive shaft 28 and the spreader drive shaft 29 are each input at the lower end portion by a lower shaft that rotates in synchronization with the above-described upper shaft, while at the upper end portion by a cam mechanism (not shown). Oscillating driving force is transmitted to the loopers 21 and 22 and the spreaders 23 and 24. That is, as a result, the loopers 21 and 22 and the spreaders 23 and 24 are driven to swing in synchronism with the vertical movement cycle of the needle bar 12 with different phases, and execute a predetermined operation in sewing.

また、スプレッダ駆動軸29もまた筒状体であり、下糸供給源から繰り出された下糸をその内部に通して案内する機能を有している。即ち、スプレッダ駆動軸29は、下糸案内部材として機能する。また、スプレッダ駆動軸29に通された下糸は、下糸通過穴が形成された案内板30と案内管31とによりルーパ21,22及びスプレッダ23,24側まで案内される。   The spreader drive shaft 29 is also a cylindrical body, and has a function of guiding the lower thread fed from the lower thread supply source through the inside thereof. That is, the spreader drive shaft 29 functions as a lower thread guide member. Further, the lower thread passed through the spreader drive shaft 29 is guided to the loopers 21 and 22 and the spreaders 23 and 24 side by the guide plate 30 and the guide pipe 31 in which the lower thread passage hole is formed.

また、ルーパ土台20の上端部には、針板25が設けられている。この針板25は、ルーパ土台20と共に回動すると共に当該針板25の下方においてルーパ21,22及びスプレッダ23,24が揺動動作を行う配置となっている。そして、針板25の中央部には針穴25aが穿設されている。かかる針穴25aに縫い針11が挿通されて上糸のループが針板25の下方まで供給され、ルーパ21,21及びスプレッダ23,24の所定の揺動動作により下糸と係合して縫製が行われる。従って、針板25の針穴25aは、針棒12の揺動動作方向に沿った長穴状に形成されている。また、かかる針穴25aを介して縫製が行われるため、下糸はこの針穴25aを通過して布地に縫い付けられる。   A needle plate 25 is provided at the upper end of the looper base 20. The needle plate 25 rotates with the looper base 20 and the loopers 21 and 22 and the spreaders 23 and 24 are oscillated below the needle plate 25. A needle hole 25 a is formed in the center portion of the needle plate 25. The sewing needle 11 is inserted into the needle hole 25a, and the loop of the upper thread is supplied to the lower side of the needle plate 25. The looper 21, 21 and the spreaders 23, 24 are engaged with the lower thread by predetermined swinging operations, and sewing is performed. Is done. Therefore, the needle hole 25 a of the needle plate 25 is formed in a long hole shape along the swinging operation direction of the needle bar 12. In addition, since sewing is performed through the needle hole 25a, the lower thread passes through the needle hole 25a and is sewn to the fabric.

さらに、針板25の上面は、いずれもX−Y平面と平行であって、高低差が設けられた二つの平面部により構成されている。これは、針穴25aから下糸と共に芯糸を繰り出して当該芯糸を縫い込む特殊な鳩目穴かがり縫製を行う場合おいて、その縫製終了後に下糸と芯糸とをそれぞれ個別に振り分けて切断するための構造である。即ち、針板25の回動操作により、高所平面と低所平面とに芯糸と下糸とを別個に振り分けることができ、各糸の高低差により個別に糸を捕捉して切断し、個別に糸端部の保持を行う。   Furthermore, the upper surface of the needle plate 25 is composed of two flat portions that are parallel to the XY plane and provided with a height difference. This is because, in the case of performing special eyelet stitching in which the core thread is fed out from the needle hole 25a and the core thread is sewn, the lower thread and the core thread are individually divided and cut after the sewing is completed. It is a structure to do. That is, by rotating the needle plate 25, the core thread and the lower thread can be separately distributed to the high plane and the low plane, and the thread is individually captured and cut by the height difference of each thread. Hold the yarn ends individually.

(第一の下糸たぐり手段)
第一の下糸たぐり手段50は、ルーパ土台20の本体部26に設けられた揺動部材51と、この揺動部材51に対して一定方向への揺動力を常時付勢する引っ張りバネ52と、その作動時において引っ張りバネ52に抗して揺動部材51に逆方向への揺動力を付与する図示しないエアシリンダとを備えている。
往動部材51は、その揺動端部に下糸挿通穴が形成された舌片部51aを備えている。そして、揺動部材51は軸部51bを揺動軸とするその揺動動作により、舌片部51aを、前述した案内板30と案内管31との間に侵入可能に配置されている。また、引っ張りバネ52は、揺動部材51の舌片部51aを案内板30と案内管31との間に侵入させる方向への揺動力を付勢している。そして、エアシリンダは、揺動部材51の舌片部51aが案内板30と案内管31との間から脱出する方向への揺動力を付与する。
(First bobbin thread pulling means)
The first bobbin thread pulling means 50 includes a swing member 51 provided in the main body portion 26 of the looper base 20, and a tension spring 52 that constantly biases the swing member 51 in a predetermined direction. And an air cylinder (not shown) that applies a swinging force in the reverse direction to the swinging member 51 against the tension spring 52 during the operation.
The forward movement member 51 includes a tongue piece portion 51a having a lower thread insertion hole formed at the swing end portion thereof. The swing member 51 is arranged such that the tongue piece 51a can be inserted between the guide plate 30 and the guide tube 31 by the swing operation using the shaft portion 51b as the swing shaft. Further, the tension spring 52 urges a swinging force in a direction in which the tongue piece 51 a of the swinging member 51 enters between the guide plate 30 and the guide tube 31. The air cylinder applies a swinging force in a direction in which the tongue piece 51 a of the swinging member 51 escapes from between the guide plate 30 and the guide tube 31.

かかる構成により、下糸が案内板30の下糸通過穴から揺動部材51の舌片部51aを介して案内管31に通されている状態において、引っ張りバネ52に従って舌片部51aが案内板30と案内管31との間に位置している場合には、下糸経路はほぼ最短となるため、第一の下糸たぐり手段50は下糸に対して何ら働きかけを行わないが、エアシリンダの作動により舌片部51aが案内板30と案内管31の間から脱出すると、下糸経路は案内板30と案内管31の間で大きく迂回することとなることから、その分の下糸のたぐり出しが行われる。   With this configuration, when the lower thread is passed through the guide pipe 31 from the lower thread passage hole of the guide plate 30 through the tongue piece 51 a of the swing member 51, the tongue piece 51 a is guided by the tension spring 52. When it is located between 30 and the guide tube 31, the lower thread path is almost the shortest, so the first lower thread pulling means 50 does not act on the lower thread. When the tongue piece 51a escapes from between the guide plate 30 and the guide tube 31 by the operation of, the lower thread path is largely detoured between the guide plate 30 and the guide tube 31, so It is crushed out.

なお、符号53は、揺動部材51に併設された糸取りバネである。この糸取りバネ53は、一端部で片持ち状態で固定装備され、他端部には糸通し環部が設けられている。この糸通し環部は、案内板30と舌片部51aとの間において下糸が挿通される。そして、揺動部材51が下糸たぐり出し方向に揺動する場合おいて、糸取りバネ53の糸通し環部側の端部が、下糸につられて揺動部材51と同じ方向に撓み、これにより、糸取りバネ53の弾性に従って下糸に張力を付与することとなる。   Reference numeral 53 denotes a thread take-up spring provided along with the swing member 51. This thread take-up spring 53 is fixedly mounted in a cantilevered state at one end, and a threading ring is provided at the other end. In this threading ring portion, the lower thread is inserted between the guide plate 30 and the tongue piece portion 51a. When the swing member 51 swings in the lower thread protruding direction, the end of the thread take-up spring 53 on the threading ring side is bent by the lower thread and bends in the same direction as the swing member 51. Thus, tension is applied to the lower thread according to the elasticity of the thread take-up spring 53.

(糸調子手段)
糸調子手段40は、図2及び図3に示すように、図示しない下糸供給源からルーパ土台20が保持するスプレッダ駆動軸29までの下糸経路の間に配置され、ミシンフレームに固定支持されたブラケット15に装備されている。この糸調子手段40は、その駆動力が制御可能なソレノイド41と、ソレノイド41の可動軸に弾性体を介して保持された一対の糸調子皿42とを備えており、下糸を一対の糸調子皿42の間に配置する。ソレノイド41が制御に従う駆動力で可動軸を可動させることで所定の力で下糸を挟持し、当該下糸の送りに対して所定の抵抗力を付与することができる。
(Thread tension means)
2 and 3, the thread tension means 40 is disposed between a lower thread path from a lower thread supply source (not shown) to a spreader drive shaft 29 held by the looper base 20, and is fixedly supported by the sewing machine frame. The bracket 15 is equipped. The thread tension means 40 includes a solenoid 41 whose driving force can be controlled, and a pair of thread tension plates 42 held on the movable shaft of the solenoid 41 via an elastic body. It arrange | positions between the tone dishes 42. FIG. The solenoid 41 can move the movable shaft with a driving force according to the control so that the lower thread can be clamped with a predetermined force, and a predetermined resistance force can be applied to the feeding of the lower thread.

なお、図中符号43は、ソレノイド41に固定装備されたガイド板であり、下糸を挿通させる挿通穴43aが形成されている。また、ブラケット15のスプレッダ駆動軸29の下端部近傍には、第一のガイド管16が装備されている。かかる挿通穴43aからガイド管16に渡って掛け渡された下糸が、糸調子手段40の糸調子皿42を通過する配置となっている。   Reference numeral 43 in the drawing is a guide plate fixedly mounted on the solenoid 41, and has an insertion hole 43a through which a lower thread is inserted. A first guide tube 16 is provided near the lower end of the spreader drive shaft 29 of the bracket 15. The lower thread stretched over the guide tube 16 from the insertion hole 43a passes through the thread tension tray 42 of the thread tension means 40.

(第二の下糸たぐり手段)
第二の下糸たぐり手段60は、前述したブラケット15に保持されている下糸案内用の第二のガイド管17の下流側において下糸を捕捉して下糸供給源側から当該下糸のたぐり出しを行う。
即ち、第二の下糸たぐり手段60は、図2及び図3に示すように、下糸たぐり出し動作の駆動源となるエアシリンダ61と、このエアシリンダ61の作動軸に支持されると共に下糸を挿通させる挿通穴62aを備える下糸捕捉部材62と、エアシリンダ61をブラケット15に装備する装着枠63と、エアシリンダ61の作動軸の突出と後退とを切り替える作動部材としての電磁弁64とを備えている。
(Second bobbin thread picking means)
The second bobbin thread pulling means 60 captures the bobbin thread on the downstream side of the bobbin thread guiding second guide pipe 17 held by the bracket 15 described above, and pulls the bobbin thread from the bobbin thread supply source side. Make a stick out.
That is, as shown in FIGS. 2 and 3, the second bobbin thread unwinding means 60 is supported by the air cylinder 61 serving as a drive source for the bobbin thread unwinding operation and the operating shaft of the air cylinder 61 and is A lower thread catching member 62 having an insertion hole 62a through which a thread is inserted, a mounting frame 63 in which the air cylinder 61 is mounted on the bracket 15, and an electromagnetic valve 64 as an operation member for switching between the protrusion and retraction of the operation shaft of the air cylinder 61. And.

前述した第二のガイド管17は、その下流側端部が前述したガイド板43の挿通穴43aに近接するように配置されている。
そして、下糸捕捉部材62は、エアシリンダ61の後退位置において、第二のガイド管17の下流側端部とガイド板43の挿通穴43aとの間となるように配置されている。このため、下糸が第二のガイド管17の下流側端部から下糸捕捉部材62の挿通穴62aを介してガイド板43の挿通穴43aに通されている状態において、下糸捕捉部材62が後退位置にある場合には、下糸経路はほぼ最短となるため、第二の下糸たぐり手段60は下糸に対して何ら働きかけを行わないが、エアシリンダ61の作動により下糸捕捉部材62が吐出位置に前進すると、下糸経路は第二のガイド管17の下流側端部とガイド板43の挿通穴43aとの間で大きく迂回することとなることから、その分の下糸のたぐり出しが行われる。
The second guide tube 17 described above is disposed so that the downstream end thereof is close to the insertion hole 43a of the guide plate 43 described above.
The lower thread catching member 62 is disposed between the downstream end of the second guide tube 17 and the insertion hole 43 a of the guide plate 43 at the retracted position of the air cylinder 61. Therefore, in a state where the lower thread is passed from the downstream end of the second guide pipe 17 through the insertion hole 62a of the lower thread capturing member 62, the lower thread capturing member 62 Is in the retracted position, the lower thread path is almost the shortest, so the second lower thread pulling means 60 does not act on the lower thread, but the lower cylinder catching member is activated by the operation of the air cylinder 61. When 62 advances to the discharge position, the lower thread path largely detours between the downstream end portion of the second guide pipe 17 and the insertion hole 43a of the guide plate 43. It is crushed out.

なお、第二の下糸たぐり手段60は前述した第一の下糸たぐり手段50のように回動動作を行うルーパ土台20に保持されていないので、回動に要するスペース確保の問題からその動作範囲に制限を受けるような事情は生じにくく、このため、下糸捕捉部材62のエアシリンダによる移動量は、前述した第一の下糸たぐり手段のエアシリンダによる揺動部材51の舌片部51aの移動量よりも大きく設定されている。このため、第二の下糸たぐり手段60による糸たぐり量は第一の下糸たぐり手段50による糸たぐり量よりも大きく確保することが可能である。   The second bobbin thread pulling means 60 is not held by the looper base 20 that performs the rotation operation like the first bobbin thread boring means 50 described above. For this reason, the amount of movement of the lower thread catching member 62 by the air cylinder is less than the tongue piece 51a of the swinging member 51 by the air cylinder of the first lower thread pulling means described above. It is set larger than the amount of movement. For this reason, it is possible to ensure that the amount of thread pulling by the second lower thread pulling means 60 is larger than the amount of thread pulling by the first lower thread pulling means 50.

また、エアシリンダ61に空圧源からの供給動作を制御する電磁バルブ64は、第一の下糸たぐり手段50の糸たぐり動作の駆動源となるエアシリンダと共用されている。即ち、電磁弁64は、第一の下糸たぐり手段50と第二の下糸たぐり手段60の各エアシリンダに対して作動状態の切り替えを行う。
このため、第一の下糸たぐり手段50と第二の下糸たぐり手段60との動作制御を一つの制御対象物について行えば良く、制御プログラム或いは制御回路の簡易化、単純化を図ることが可能となる。なお、第一の下糸たぐり手段50と第二の下糸たぐり手段60との作動タイミングに差を設ける場合には、電磁バルブ64といずれかの下糸たぐり手段のエアシリンダとの間に供給空気の伝達を遅延させる空圧素子を介在させればよい。
Further, the electromagnetic valve 64 for controlling the supply operation from the air pressure source to the air cylinder 61 is shared with the air cylinder which is a driving source for the thread pulling operation of the first lower thread pulling means 50. That is, the solenoid valve 64 switches the operating state for each air cylinder of the first lower thread pulling means 50 and the second lower thread pulling means 60.
For this reason, the operation control of the first lower thread bouncing means 50 and the second lower thread bouncing means 60 may be performed for one control object, and the control program or the control circuit can be simplified and simplified. It becomes possible. When there is a difference in operation timing between the first bobbin threading means 50 and the second bobbin threading means 60, supply is made between the electromagnetic valve 64 and the air cylinder of any of the bobbin thread bouncing means. What is necessary is just to interpose the pneumatic element which delays transmission of air.

(下糸切断手段及び下糸保持手段)
下糸切断手段80は、図4に示すように、ベッド部上面においてZ軸方向を中心に回動する可動メス81と、可動メス81の回動先に位置して当該可動メス81と摺接してルーパ21,22から布に連なる下糸を切断する固定メス82と、を備えている。
可動メス81は、その基端部がベッド部2a上に回動可能に支持されており、回動端部はY軸方向から見た形状が三叉状に形成されている。これは、前述した芯糸を使用する縫製において、その切断時に高低差をもって下糸と芯糸がそれぞれ針板25上に配置されることから、三叉状先端部のそれぞれの分岐部に下糸と芯糸とを捕捉することができる構造となっている。なお、芯糸を使用しない場合に下糸のみを捕捉することができるのはいうまでもない。
固定メス82は、回動する可動メス81の回動半径方向外側に摺接して下糸及び芯糸を切断することができる配置となっている。
(Lower thread cutting means and lower thread holding means)
As shown in FIG. 4, the lower thread cutting means 80 has a movable knife 81 that rotates about the Z-axis direction on the upper surface of the bed, and a sliding destination of the movable knife 81 that is located at the rotation destination of the movable knife 81. And a fixed knife 82 for cutting the lower thread connected to the cloth from the loopers 21 and 22.
The movable knife 81 has a base end portion rotatably supported on the bed portion 2a, and the rotating end portion is formed in a trifurcated shape as viewed from the Y-axis direction. This is because the lower thread and the core thread are arranged on the needle plate 25 with a height difference at the time of cutting using the above-described core thread. It has a structure that can capture the core yarn. Needless to say, only the lower thread can be captured when the core thread is not used.
The fixed knife 82 is arranged so as to be able to cut the lower thread and the core thread by slidingly contacting the outer side of the rotating movable knife 81 in the rotational radius direction.

下糸保持手段14は、可動メス81の回動方向先に位置しており、当該可動メス81に捕捉された下糸及び芯糸がそれぞれの切断前に受け渡されて保持を行う。
この下糸保持手段14は、高低差をもって二つの糸挟持部を備え、それぞれの糸挟持部において下糸と芯糸とを保持する。
The lower thread holding means 14 is positioned ahead of the movable knife 81 in the rotational direction, and the lower thread and the core thread captured by the movable knife 81 are delivered and held before each cutting.
The lower thread holding means 14 includes two thread holding portions with a height difference, and holds the lower thread and the core yarn in each of the thread holding portions.

(鳩目穴かがりミシンの動作)
上記構成からなる鳩目穴かがりミシン10の図示しない動作制御手段による制御に従った縫製動作を図1乃至図5に基づいて説明する。図5は縫製開始から終了までの針板25の向きの変化を順番に示した動作説明図である。
まず、布台71上に布地Cがセットされて布押さえ73により保持される。そして、布台71が針板25と針棒12の下方となる縫製位置に移動される。このとき、針板25は、その円形部が縫製進行方向に向けられた状態とされる(図5(A))。つまり、図5における右側に向かって縫い目が形成されるように縫製が行われる。
また、糸調子手段40は、下糸に所定の張力が生じるようにソレノイド41を駆動させて下糸を糸調子皿42で押圧する。
(Operation of the eyelet-punching machine)
The sewing operation according to the control by the operation control means (not shown) of the eyelet sewing machine 10 having the above configuration will be described with reference to FIGS. FIG. 5 is an operation explanatory view showing the change in the direction of the needle plate 25 from the start to the end of sewing in order.
First, the cloth C is set on the cloth base 71 and held by the cloth presser 73. Then, the cloth base 71 is moved to a sewing position below the needle plate 25 and the needle bar 12. At this time, the needle plate 25 is in a state in which the circular portion is directed in the sewing progressing direction (FIG. 5A). That is, the sewing is performed so that the seam is formed toward the right side in FIG.
Further, the thread tension means 40 drives the solenoid 41 so that a predetermined tension is generated in the lower thread and presses the lower thread with the thread tension tray 42.

まずは、鳩目穴の直線状部に沿って縫製が行われる。即ち、鳩目穴の直線状部の片側において、縫い針12が揺動しつつも上下動を行う。これにより、上糸が布地下方において、ルーパ21,22により捕捉され、さらにスプレッダ23,24によりループが広げられると共に下糸が上糸ループに挿入される。これにより、上糸と下糸とが係合してこれを繰り返すことによりかがり縫い縫製が行われる。   First, sewing is performed along the straight portion of the eyelet hole. That is, on one side of the straight portion of the eyelet hole, the sewing needle 12 moves up and down while swinging. As a result, the upper thread is captured by the loopers 21 and 22 below the fabric, and the loop is widened by the spreaders 23 and 24, and the lower thread is inserted into the upper thread loop. As a result, the upper thread and the lower thread are engaged with each other and repeated, thereby performing overlock sewing.

そして、鳩目穴の直線状部の片側の縫製が終わり、円弧状部の縫製に移行すると、当該円弧形状に応じてルーパ土台20及び針棒12が時計方向の回動を開始する。図5(B)は円弧状部の頂点位置における針板の向きを示している。
そして、縫製が進行し、円孔状部が終わると針板25はその向きが丁度反転する(図5(C))。このように、ルーパ土台20と針棒12が回動することで、針棒12の揺動が放射状に行われ、上糸の縫い目も放射状に形成される。
Then, when the sewing on one side of the linear portion of the eyelet hole is finished and the process proceeds to the sewing of the arc-shaped portion, the looper base 20 and the needle bar 12 start to rotate in the clockwise direction according to the arc shape. FIG. 5B shows the direction of the needle plate at the apex position of the arcuate portion.
When the sewing proceeds and the circular hole ends, the direction of the needle plate 25 is just reversed (FIG. 5C). As described above, the looper base 20 and the needle bar 12 are rotated, whereby the needle bar 12 is oscillated radially, and the stitches of the upper thread are also formed radially.

そして、針板25が反転状態で鳩目穴の直線状部のもう一方の片側の縫製を完了すると、布台71が退避位置側に少量の移動を行う。そして、図示しない上糸切断手段が作動して上糸の切断が行われる。また上糸の切断時において、糸調子手段40が下糸を解放する制御が行われると共に、電磁弁64が各エアシリンダを作動状態に切り替える制御が行われ、第一の下糸たぐり手段50及び第二の下糸たぐり手段60による糸のたぐり出しが行われる。
この時、第一の下糸たぐり手段50により下糸供給源側からたぐり出される下糸の長さは、後に布台71が待避位置まで移動する際に消費する分とその後下糸切断手段80の可動メス81が下糸を切断する際に消費する分とを加算した長さよりも若干短くなるように当該第一の下糸たぐり手段50の機械的構成より設定されており、第一の下糸たぐり手段50により手繰りだされた下糸は、スプレッダー駆動軸29の上端部と案内管31との間に蓄えられる。
また、第二の下糸たぐり手段60により下糸供給源側からたぐり出される下糸の長さは、上述したように第一の下糸たぐり手段50が手繰り出す長さよりも長くなるように、当該第二の下糸たぐり手段60の機械的構成によって設定されている。なお、第二の下糸たぐり手段60は、糸調子手段40よりも上流側に位置しているため、第二の下糸たぐり手段がたたぐり出す下糸の長さは、若干多すぎても、次の縫製時には、糸調子手段40により縫製に必要な張力が下糸に与えられ縫い品質に影響を与えることがない。
Then, when the sewing of the other side of the straight portion of the eyelet hole is completed in the inverted state of the needle plate 25, the cloth base 71 moves a small amount to the retracted position side. Then, the upper thread cutting means (not shown) is operated to cut the upper thread. Further, when the upper thread is cut, the thread tension means 40 is controlled to release the lower thread, and the solenoid valve 64 is controlled to switch each air cylinder to the operating state. The second bobbin thread unwinding means 60 pulls out the thread.
At this time, the length of the lower thread that is pulled out from the lower thread supply source side by the first lower thread pulling means 50 is the amount consumed when the cloth base 71 moves to the retracted position later, and the lower thread cutting means 80 thereafter. The movable knife 81 is set by the mechanical configuration of the first lower thread pulling means 50 so as to be slightly shorter than the length obtained by adding the amount consumed when cutting the lower thread. The lower thread handed out by the thread winding means 50 is stored between the upper end portion of the spreader drive shaft 29 and the guide tube 31.
Further, the length of the lower thread that is pulled out from the lower thread supply source side by the second lower thread pulling means 60 is longer than the length that the first lower thread pulling means 50 is manually fed as described above. It is set by the mechanical configuration of the second lower thread pulling means 60. Since the second lower thread pulling means 60 is located upstream of the thread tension means 40, the length of the lower thread that the second lower thread pulling means knocks out may be slightly too long. At the next sewing, the tension necessary for sewing is applied to the lower thread by the thread tension means 40, and the sewing quality is not affected.

その後、布台71が退避位置まで大きく移動され、図4及び図5(D)に示すように、針穴25aから下糸が引き出された状態となる。また、針板25は、時計方向にさらに回動して幾分斜め方向を向いた状態となる。このとき、前述した芯糸Jを使用する縫製が行われていた場合には、針板25において芯糸用繰り出し穴25bが設けられていることから、針板25が斜め方向を向いて布台71の移動によりそれぞれの糸が引き出された場合に、それぞれに位置ずれを生じ、針板25の上面の高所平面上に芯糸Jが位置し、低所平面に下糸Dが位置する。なお、このように振り分けられるのは、針穴25aの形状と針板25の向きと高所平面と低所平面の境界位置と芯糸繰り出し穴25bの位置設定とに起因する。   Thereafter, the cloth base 71 is moved greatly to the retracted position, and as shown in FIGS. 4 and 5D, the lower thread is pulled out from the needle hole 25a. Further, the needle plate 25 is further rotated in the clockwise direction and is in a state of being somewhat inclined. At this time, in the case where the above-described sewing using the core yarn J has been performed, the needle plate 25 is provided in the needle plate 25 so that the needle plate 25 is directed obliquely because the core yarn feeding hole 25b is provided. When the respective yarns are pulled out by the movement of 71, a positional shift occurs, and the core yarn J is located on the high plane on the upper surface of the needle plate 25, and the lower thread D is located on the low plane. This sort of distribution is caused by the shape of the needle hole 25a, the orientation of the needle plate 25, the boundary position between the high place plane and the low place plane, and the position setting of the core thread feeding hole 25b.

上記状態で下糸切断手段80が駆動を行う。即ち、可動メス81が回動を行い、張られた状態の下糸D及び芯糸Jをそれぞれ別個に捕捉して固定メス82側に引き寄せてゆき、下糸D及び芯糸Jをそれぞれ下糸保持手段14に受け渡して別個に保持させると共に固定メス82との摺動により各糸を切断する。この下糸の切断の際には、第一の糸たぐり手段50により繰り出された下糸のうち布台71の待避位置への移動に要する分は、既に消費されているので、スプレッダー駆動軸29の上端部と案内管31との間には、下糸を切断する際に消費する分よりも若干少ない長さの下糸が蓄えられており、可動メス81の回動にともなってまずこの蓄えられた下糸が消費される。
次いで、蓄えられた下糸が消費されると、下糸が張られる。この時、布に縫着された下糸には、針板25からソレノイド41の糸調子手段81に到る下糸の経路による摺動摩擦抵抗、糸取りバネ53による弾性、下糸の自重等が加算された張力が作用するが、この張力は、糸調子手段81よりも上流側の下糸が第二の糸繰り出し手段60によりたぐり出されている分低減され、布側の下糸を引き出すのに要する張力に満たなくなり、結果、第二糸繰り出し手段60により繰り出された下糸が不足分として引き出され、布側の下糸が引き出されることが防止される。また、この時下糸に働く張力が、下糸切断に必要な張力となって、下糸が切断される。従って、下糸切断時に布地から下糸が引き出されることを防止して、きれいな穴かがり縫い目を形成できるとともに、確実に下糸を切断することができる。
以上で、一連の縫製動作が全て終了する。なお、下糸D及び芯糸Jはそれぞれ別個に下糸保持手段14により保持されることから、保持端部から次の縫製を再開することが可能である。
The lower thread cutting means 80 is driven in the above state. That is, the movable knife 81 rotates, and the tensioned lower thread D and core thread J are separately captured and drawn toward the fixed knife 82, and the lower thread D and core thread J are respectively pulled down by the lower thread. The yarn is transferred to the holding means 14 and held separately, and each thread is cut by sliding with the fixed knife 82. At the time of cutting the lower thread, the part of the lower thread fed out by the first thread pulling means 50 is already consumed, so that the spreader drive shaft 29 is already consumed. A lower thread length slightly shorter than that consumed when the lower thread is cut is stored between the upper end of the guide tube 31 and the guide pipe 31. The used lower thread is consumed.
Next, when the stored lower thread is consumed, the lower thread is stretched. At this time, the lower thread sewn on the cloth is added with sliding frictional resistance along the path of the lower thread from the needle plate 25 to the thread tension means 81 of the solenoid 41, elasticity by the thread take-up spring 53, and the lower thread's own weight. However, this tension is reduced by the amount of the lower thread upstream from the thread tension means 81 being squeezed out by the second thread feeding means 60, and is used to pull out the lower thread on the fabric side. As a result, the lower tension drawn by the second yarn feeding means 60 is pulled out as a shortage, and the lower yarn on the fabric side is prevented from being pulled out. At this time, the tension acting on the lower thread becomes a tension necessary for cutting the lower thread, and the lower thread is cut. Accordingly, it is possible to prevent the lower thread from being pulled out of the fabric when cutting the lower thread, to form a clean hole stitching seam, and to reliably cut the lower thread.
Thus, a series of sewing operations are all finished. Since the lower thread D and the core thread J are separately held by the lower thread holding means 14, it is possible to resume the next sewing from the holding end.

(実施形態の効果)
以上のように、鳩目穴かがりミシン10は、第二の下糸たぐり手段60により、切断直前の下糸の引き出し及び切断の際に下糸に張力を与えるための下糸消費分を予めたぐり出すことが可能である。
さらに、糸調子手段40よりも下糸供給源に近い配置となる第二の下糸たぐり手段60により下糸のたぐり出しが行われることから、第二の下糸たぐり手段60の下流側にある各構成において下糸に生じる摺動摩擦等により、布地側から下糸をたぐり出すという事態を回避し、縫製された下糸を締め付けすぎたり、縫製により形成されるべき下糸の形状が変形させられてしまうような不都合を回避することが可能となる。即ち、縫い品質の向上を図ることが可能となる。特に、両端に鍔がある糸駒を使用した場合、或いは滑りやすい下糸を使用した場合であっても、縫い品質を高く維持することが可能となる。
さらに、第二の下糸たぐり手段60は、糸調子手段40よりも上流側に配置することから、第二の下糸たぐり手段60での糸たぐり量が過剰な場合であっても、切断時に糸調子手段40により下糸に張力を付与することで、弛みによる切断不良や糸保持不良を防止することが可能となる。
(Effect of embodiment)
As described above, the eyelet-punching sewing machine 10 uses the second lower thread pulling means 60 to draw out the lower thread consumption for applying tension to the lower thread when the lower thread is pulled out and cut just before cutting. It is possible.
Further, since the lower thread is pulled out by the second lower thread pulling means 60 which is arranged closer to the lower thread supply source than the thread tension means 40, it is located downstream of the second lower thread pulling means 60. In each configuration, the situation where the lower thread is pulled out from the fabric side due to sliding friction generated in the lower thread is avoided, the sewn lower thread is tightened too much, or the shape of the lower thread to be formed by sewing is deformed. It is possible to avoid such inconveniences. That is, the sewing quality can be improved. In particular, it is possible to maintain high sewing quality even when a thread piece having a heel at both ends or a slippery lower thread is used.
Further, since the second bobbin thread lifting means 60 is disposed upstream of the thread tension means 40, even when the amount of thread bogging in the second bobbin thread lifting means 60 is excessive, it is not By applying tension to the lower thread by the thread tension means 40, it becomes possible to prevent cutting defects and thread holding defects due to slack.

また、本実施形態では、第一の下糸たぐり手段50による糸たぐりと第二の下糸たぐり手段60による糸たぐりとを同時に実行している。このように同時に糸たぐりを行うか、或いは、第二の下糸たぐり手段60による糸たぐりを先行させて行うことが望ましい。第二の下糸たぐり手段60が下糸供給源から下糸をたぐり出すことから、第一の下糸たぐり手段50によるたぐり出しの際に糸供給源側からより確実に下糸をたぐり出して、布地側からのたぐり出しをより効果的に回避することができるからである。
なお、第二の下糸たぐり手段60を先行させるためには、前述したように、第一の下糸たぐり手段50側の空気圧の供給を遅延させる空圧素子を使用するか、電磁弁を個別に設けることが望ましい。
In the present embodiment, the thread boring by the first bobbin thread lifting means 50 and the thread boring by the second bobbin thread pulling means 60 are simultaneously executed. In this way, it is desirable to carry out the thread pulling at the same time or to carry out the thread pulling by the second lower thread pulling means 60 in advance. Since the second bobbin threading means 60 pulls out the bobbin thread from the bobbin thread supply source, when the first bobbin threading means 50 pulls out the bobbin thread, the bobbin thread is more reliably pulled out from the thread supply source side. This is because the protrusion from the fabric side can be more effectively avoided.
In order to precede the second lower thread threading means 60, as described above, a pneumatic element for delaying the supply of air pressure on the first lower thread threading means 50 side is used, or an electromagnetic valve is individually provided. It is desirable to provide in.

(その他)
また、上記実施形態にあっては、第一の下糸たぐり手段50と第二の下糸たぐり手段60とで各々のエアシリンダを駆動させる電磁弁の共通化を図っているが、これを個別の電磁弁により個別に制御する構成としても良い。また、前述したように、電磁弁を共通化して空気圧の供給を遅延させても良い。
それらの場合、各部の動作制御を行う動作制御手段は、縫製終了(縫い針の上下動駆動の停止)から布台の退避位置までの移動を行うまでの間で、第一の下糸たぐり手段50とは異なるタイミングで第二の下糸たぐり手段60による糸たぐりを実行すると共に、第二の下糸たぐり手段60の糸たぐりの際には糸調子手段40における下糸の通過を制止させる程度の抵抗力を付与させるようにソレノイド41を動作制御することが望ましい。
これにより、第二の下糸たぐり手段60による糸たぐりが糸調子手段40よりも上流側からのみたぐり出されるようににすることを可能とし、下糸供給源から十分な量の下糸のたぐり出しを行うことを可能とすると共に、より布地側からの糸たぐりを効果的に防止することが可能となる。
また、この場合も、第二の下糸たぐり手段60の糸たぐりを第一の下糸たぐり手段50よりも先行させることがより望ましい。
(Other)
In the above embodiment, the first lower thread pulling means 50 and the second lower thread pulling means 60 share the solenoid valve that drives each air cylinder. It is good also as a structure controlled individually by this solenoid valve. Further, as described above, the supply of air pressure may be delayed by using a common electromagnetic valve.
In those cases, the operation control means for controlling the operation of each part is the first bobbin thread pulling means from the end of sewing (stop of the vertical movement of the sewing needle) to the movement of the cloth base to the retracted position. The thread pulling by the second lower thread pulling means 60 is executed at a timing different from 50, and the passage of the lower thread in the thread tension means 40 is stopped when the second lower thread pulling means 60 is threaded. It is desirable to control the operation of the solenoid 41 so as to apply the above-described resistance force.
As a result, it is possible to allow the second bobbin threading means 60 to pull out the thread from only the upstream side of the thread tension means 40, and a sufficient amount of bobbin thread can be removed from the bobbin thread supply source. It is possible to perform the unwinding and to effectively prevent the thread from the fabric side.
Also in this case, it is more desirable that the second bobbin thread pulling means 60 is preceded by the first bobbin thread pulling means 50.

また、上記実施形態にあっては、鳩目穴かがりミシン10において、第二の下糸たぐり手段60及び第一の下糸たぐり手段50を作動させる作動部材として電磁弁64を用いているが、第一の下糸たぐり手段50及び第二の下糸たぐり手段60に対して個別に設けられたソレノイドによって駆動できるように構成しても良い。   In the above embodiment, in the eyelet sewing machine 10, the electromagnetic valve 64 is used as an operating member for operating the second lower thread lifting means 60 and the first lower thread lifting means 50. You may comprise so that it can drive with the solenoid provided separately with respect to the 1 bobbin thread pulling means 50 and the 2nd bobbin thread pulling means 60. FIG.

本実施形態の鳩目穴かがりミシンの一部を切り欠いた側面図である。It is the side view which notched a part of eyelet hole sewing machine of this embodiment. 下糸経路中にある鳩目穴かがりミシンの各構成を正面方向から見た構成図である。It is the block diagram which looked at each structure of the eyelet hole sewing machine in a lower thread path from the front. 図2と同じ構成を側面方向から見た構成図である。It is the block diagram which looked at the same structure as FIG. 2 from the side surface direction. 鳩目穴かがりミシンのベッド部上面における針板周囲の構成を示す平面図である。It is a top view which shows the structure around the needle plate in the bed part upper surface of an eyelet-holed sewing machine. 縫製開始から終了までの針板の向きの変化を示した動作説明図であり、図5(A)は縫製開始時、図5(B)は折り返し位置である円弧状部の頂点の縫製時、図5(C)は反転時を示し、図5(D)は下糸切断時の状態を示す。FIG. 5A is an operation explanatory view showing a change in the direction of the needle plate from the start to the end of sewing, FIG. 5A is when sewing is started, and FIG. 5B is when sewing the apex of the arcuate portion that is the folding position; FIG. 5 (C) shows the time of reversal, and FIG. 5 (D) shows the state when the lower thread is cut. 図6(A)は鳩目穴かがり縫製による下糸及び上糸による適正な縫い状態を示し、図6(B)は不適正な縫い状態を示す説明図である。FIG. 6 (A) shows an appropriate sewing state with lower thread and upper thread by eyelet stitching, and FIG. 6 (B) is an explanatory diagram showing an inappropriate sewing state. 図7(A)は下糸供給源として両端に鍔のある小型の糸駒の例を示す斜視図であり、図7(B)は上端に鍔がない通常の糸駒の例を示す斜視図である。FIG. 7A is a perspective view showing an example of a small thread spool having a heel at both ends as a lower thread supply source, and FIG. 7B is a perspective view showing an example of a normal thread spool without a heel at the upper end. .

符号の説明Explanation of symbols

11 縫い針
12 針棒
20 ルーパ土台
21,22 ルーパ
27 回動軸部
29 スプレッダ駆動軸
30 案内板
31 案内管
40 糸調子手段
50 第一の下糸たぐり手段
60 第二の下糸たぐり手段
80 下糸切断手段
11 Sewing needle 12 Needle bar 20 Looper base 21, 22 Looper 27 Rotating shaft portion 29 Spreader drive shaft 30 Guide plate 31 Guide tube 40 Thread tension means 50 First lower thread tension means 60 Second lower thread tension means 80 Lower Thread cutting means

Claims (3)

上糸が通される縫い針を支持する針棒と、
下糸が通されるルーパを上部において支持すると共に、前記針棒と共に上下方向を中心に回動するルーパ土台と、
前記ルーパ土台に回動力を伝達する回動軸と、
前記回動軸の軸線に沿って設けられ、下糸供給源から前記下糸を前記ルーパに案内する下糸案内部材と、
前記下糸案内部材と前記ルーパとの間に設けられ、前記下糸をたぐって弛みを付与する第一の下糸たぐり手段と、
前記下糸供給源から前記下糸案内部材の間に設けられ、前記下糸の送りに抵抗力を付与する糸調子手段と、
縫製終了後に前記ルーパから布に連なる下糸を切断する下糸切断手段と備えた鳩目穴かがりミシンにおいて、
前記下糸供給源から前記糸調子手段までの下糸経路中に、縫製終了後から前記下糸切断手段により前記下糸が切断されるまでの間に、前記下糸を前記下糸供給源からたぐり出す第二の下糸たぐり手段を設けたことを特徴とする鳩目穴かがりミシン。
A needle bar that supports a sewing needle through which the upper thread is passed;
A looper base that supports a looper through which the lower thread is passed at the top and rotates about the vertical direction together with the needle bar,
A rotating shaft for transmitting rotational force to the looper base;
A lower thread guide member that is provided along the axis of the rotation shaft and guides the lower thread from the lower thread supply source to the looper;
A first bobbin threading means provided between the bobbin thread guide member and the looper, for slackening by bouncing the bobbin thread;
A thread tension means provided between the lower thread supply source and the lower thread guide member for imparting resistance to feeding of the lower thread;
In the eyelet-operated sewing machine provided with lower thread cutting means for cutting lower thread connected to the cloth from the looper after the end of sewing,
In the lower thread path from the lower thread supply source to the thread tension means, the lower thread is removed from the lower thread supply source after the end of sewing until the lower thread is cut by the lower thread cutting means. The eyelet sewing machine characterized in that a second bobbin threading means is provided.
前記第二の下糸たぐり手段は、そのたぐり出し動作を開始させる作動部材を前記第一の下糸たぐり手段と共用することを特徴とする請求項1記載の鳩目穴かがりミシン。 2. The eyelet sewing machine according to claim 1, wherein the second bobbin threading means shares an operating member for starting the boring operation with the first bobbin threading means. 前記第二の下糸たぐり手段は、前記第一の下糸たぐり手段と異なるタイミングでたぐり出し動作を行うと共に、前記第二の下糸たぐり手段のたぐり出し動作の際に、前記糸調子手段が前記ルーパ側からの下糸の繰り出しを阻止する抵抗力を前記下糸に付与するように制御を行う動作制御手段を備えることを特徴とする請求項1記載の鳩目穴かがりミシン。 The second lower thread unwinding means performs an unwinding operation at a timing different from that of the first lower thread unwinding means, and at the time of the unwinding operation of the second lower thread unwinding means, the thread tension means 2. The eyelet-punching sewing machine according to claim 1, further comprising operation control means for performing control so that a resistance force for preventing the lower thread from being fed from the looper side is applied to the lower thread.
JP2003387710A 2003-11-18 2003-11-18 Eyelet hole sewing machine Expired - Fee Related JP4247097B2 (en)

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JP5241445B2 (en) * 2008-11-20 2013-07-17 Juki株式会社 Button hole sewing machine looper mechanism
CN105113147B (en) * 2015-08-18 2017-09-01 浙江中捷缝纫科技有限公司 A kind of thread cutting mechanism of sewing machine
CN105113148B (en) * 2015-08-18 2017-11-14 浙江中捷缝纫科技有限公司 The trimming and thread clamping mechanism of a kind of sewing machine

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