JP2007167406A - Threading device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a threading device of a sewing machine which enables a series of threading actions regardless of the stop position of a needle rod. <P>SOLUTION: The device has the needle rod movable vertically, a threading portion 16 having an operation lever 14 and a threading claw 15 and movable vertically parallel to the needle rod 1 and turnable, a stopper 12 having an abutting face 13 to the upper end of the needle rod 1, a threading shaft 10 formed so as to be fixed with the the stopper 12 at the upper end, fixed with the threading portion 16 at the lower end and having a height from the threading claw 15 to the abutting face 13 being the same as that from a needle hole 9 to the upper end of the needle rod 1, a threading shaft arm 11 supporting the threading shaft 10, and a return spring 17 arranged in the outer peripheral side of the threading shaft 10 present between the threading shaft arm 11 and the stopper 12. The thread is threaded by making the abutting face 13 abut to the upper end of the needle rod 1 by lowering the operation lever 14 and stopping the threading claw 15 to the height position facing to the needle hole 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ミシンの糸通し装置に関するものであり、特に操作レバーを下降させると、糸通し爪を保持する糸通し部が下降して、糸通し爪を、針穴に対面する高さ位置に停止させて、一連の糸通し動作が出来るようにするミシンの糸通し装置に関するものである。   The present invention relates to a threading device for a sewing machine, and in particular, when the operation lever is lowered, the threading part for holding the threading claw is lowered, and the threading claw is brought to a height position facing the needle hole. The present invention relates to a threading device for a sewing machine that is stopped and allows a series of threading operations.

ミシンによる縫製作業の中で、ミシン針の針穴に上糸を通す作業は、針穴の大きさが、通常、横０．４×縦１ｍｍ程度の極めて小さな長穴状となっているため、細かい注意力を要する作業となって面倒であり、特に視力の弱い作業者や、糸通し作業に慣れていない初心者にとっては、大変煩わしい作業となっていた。   In sewing work with the sewing machine, the work of passing the needle thread through the needle hole of the sewing needle is because the needle hole size is usually a very small elongated hole shape of about 0.4 mm wide x 1 mm long. It is a cumbersome task that requires fine attention, and is particularly troublesome for a worker with low vision or a beginner who is not used to threading.

このため、近年では、ミシン針の針穴へ上糸を通す作業を容易にするために、ミシンに糸通し装置を備えたものが、特に家庭用のミシンを中心に多くなってきている。   For this reason, in recent years, in order to facilitate the operation of passing the upper thread through the needle hole of the sewing needle, a number of sewing machines equipped with a threading device have been increasing, especially home sewing machines.

この糸通し装置は、一般的には、操作レバーと糸通し爪を保持する糸通し部を下端に備えた糸通し軸を、操作レバーの操作によって下降させ、まず、糸通し部を、針棒に固着されるミシン針の針穴まで降下させる。   In this threading device, generally, a threading shaft having a threading part for holding an operation lever and a threading claw at the lower end is lowered by operating the operation lever. First, the threading part is moved to the needle bar. The needle is lowered to the needle hole of the sewing needle fixed to the needle.

次に、さらに操作レバーによって、糸通し部を、針棒の運動軌跡の外周回りに回動して針穴に対面させ、上糸を掛けた糸通し爪を、ミシン針の針穴に挿通させることにより、上糸を針穴に引き込むようになっている。   Next, with the operation lever, the threading part is rotated around the outer circumference of the needle bar movement locus to face the needle hole, and the threading claw with the upper thread is inserted into the needle hole of the sewing needle. As a result, the upper thread is pulled into the needle hole.

この操作レバーによって糸通し軸を下降させ、糸通し爪の高さ位置を、針棒に固着されるミシン針の針穴の高さ位置にあわせるための糸通し装置として、糸通し爪が糸通し部を介して取り付けられている糸通し軸を、針棒の上下動に連動させるものが提案されている。（特許文献１）
上記公報に係る糸通し装置は、針穴を有するミシン針を下端に保持し、上下動可能な針棒と、針棒の高さ方向途中に連結され、針棒駆動機構からの上下往復運動を伝達する針棒抱きと、針棒の針棒抱き下方に取り付けられるストッパーと、針棒にほぼ平行に上下動および回動可能にミシン機枠に支持される共に、高さ方向の途中にストッパーへ当接自在のピンが挿通される糸通し軸と、ピンとミシン機枠の間にある糸通し軸の外周側にピンを上方に付勢する復帰バネと、糸通し軸の下端に取り付けられ、糸通し軸を下降、回動させるための操作レバーおよび針穴に係合可能な糸通し爪を保持する糸通し部とからなる。 The threading claw is used as a threading device for lowering the threading shaft by this operation lever and adjusting the height position of the threading claw to the height position of the needle hole of the sewing needle fixed to the needle bar. There has been proposed one in which a threading shaft attached via a portion is interlocked with the vertical movement of a needle bar. (Patent Document 1)
The threading device according to the above publication holds a sewing needle having a needle hole at the lower end, and is connected to a needle bar that can move up and down, and in the middle of the needle bar in the height direction, and reciprocates up and down from the needle bar drive mechanism. The needle bar hug that transmits, the stopper attached to the needle bar hug below the needle bar hug, and supported by the machine frame so that it can move up and down and turn almost parallel to the needle bar, and to the stopper halfway in the height direction A threading shaft through which the abutable pin is inserted, a return spring that urges the pin upward on the outer peripheral side of the threading shaft between the pin and the machine frame, and a lower end of the threading shaft. An operation lever for lowering and rotating the threading shaft and a threading part for holding a threading claw that can be engaged with the needle hole.

そして、針棒を上死点付近で停止させた状態で、操作レバーを下降させると、糸通し軸のピンが針棒のストッパーに当接して、糸通し軸の下降が停止され、この停止位置で、ミシン針の針穴の高さ位置と糸通し爪の高さ位置が一致するようになっている。   When the operation lever is lowered while the needle bar is stopped near the top dead center, the pin of the threading shaft comes into contact with the stopper of the needle bar, and the lowering of the threading shaft is stopped. Thus, the height position of the needle hole of the sewing needle matches the height position of the threading claw.

この停止位置で、さらに操作レバーにより、糸通し部を回動させて、ミシン針の針穴に糸通し爪を係合して上糸を案内し、上糸を針穴に引き込むようになっている。   At this stop position, the threading part is further rotated by the operation lever, the threading claw is engaged with the needle hole of the sewing needle to guide the upper thread, and the upper thread is pulled into the needle hole. Yes.

さらに、上記公報に係る糸通し装置では、糸通し軸のピンが係合するカム溝部が形成されたカム板と、ピンを介して糸通し軸を上方に付勢する復帰バネを備え、糸通し爪と針穴との係合状態で針棒が下降すると、針棒により糸通し爪を介して下降させられる糸通し軸が、前記カム溝部により糸通し部を伴って軸部を中心に回動されて、針穴から糸通し爪が抜け出ると共に糸通し装置が、もとの上昇位置に復帰するようになっている。   Further, the threading device according to the above publication includes a cam plate formed with a cam groove portion that engages with a pin of the threading shaft, and a return spring that biases the threading shaft upward via the pin. When the needle bar is lowered while the claw and the needle hole are engaged, the threading shaft that is lowered by the needle bar via the threading claw rotates around the shaft part with the threading part by the cam groove. As a result, the threading claw comes out of the needle hole, and the threading device returns to the original raised position.

この従来技術によれば、針棒を上死点付近で停止させた状態で、操作レバーを下降させて、糸通し軸に挿通されるピンを、針棒に取り付けたストッパーに当接させることにより、自動的にミシン針の針穴の高さ位置に、糸通し爪の高さ位置に合わせることができる。   According to this conventional technique, with the needle bar stopped near the top dead center, the operation lever is lowered, and the pin inserted through the threading shaft is brought into contact with the stopper attached to the needle bar. It can be automatically adjusted to the height position of the needle hole of the sewing needle and the height position of the threading claw.

このため、針棒を糸通し度に、針穴の高さ位置に、糸通し爪の高さ位置を手動であわせて、糸通し爪と針穴が同じ高さで対面していることを確認する作業が必要でなくなり、糸通し作業が楽になるという利点を有する。   Therefore, manually adjust the needle bar to the height of the needle hole and the height of the needle hole, and make sure that the height of the threading claw is the same height. Therefore, there is an advantage that the threading work becomes easier.

また、糸通し中に誤ってミシンの駆動装置を操作し場合、糸通し作業は中断するが、糸通し装置は安全な位置に上昇復帰するようになっているので、誤動作などによるミシンの始動によって、糸通し装置が上下往復動する針棒によって破損することがないという利点を有する。
特開平７−２８４５８８号公報 Also, if the sewing machine drive unit is accidentally operated during threading, the threading operation will be interrupted, but the threading device will return and return to a safe position. The threading device has the advantage that it is not damaged by the needle bar that reciprocates up and down.
JP-A-7-284588

しかしながら上記した特開平７−２８４５８８号公報の技術によれば、糸通しの度に、針棒を上死点付近に停止させた状態のもとで、操作レバーを操作して、糸通しを行う構成となっている。   However, according to the technique disclosed in Japanese Patent Application Laid-Open No. 7-284588, the threading is performed by operating the operating lever with the needle bar stopped near the top dead center every time the threading is performed. It has a configuration.

このため、糸通し作業をなすための準備段階として、あらかじめ針棒を移動させて、上死点付近に停止させておく必要があった。   For this reason, as a preparation stage for performing the threading operation, it is necessary to move the needle bar in advance and stop it near the top dead center.

したがって、作業者にとっては、糸を通す作業の度に、この針棒を、上死点付近に停止させるための作業が必要となってわずらわしく、面倒で手間のかかる作業となっているという問題があった。   Therefore, it is troublesome for the operator to stop the needle bar near the top dead center every time the thread is passed, and it is troublesome and troublesome. there were.

また、針棒を上死点付近に停止させた状態にしておくための部品も必要となりで、その分コストアップにつながるという問題もあった。   In addition, a part for keeping the needle bar near the top dead center is necessary, which leads to a cost increase.

また、針棒の高さ方向の途中には、糸通し軸側に挿通されるピンに当接して、針穴の高さ位置と糸通爪の高さ位置とを一致させるためのストッパーが、ネジ止めなどで取りつけられているが、このストッパー等の部品が増加する分、針棒の慣性重量が重くなって、高速に上下動する針棒に対して、慣性上の悪影響を及ぼすといった問題もあった。   Further, in the middle of the needle bar in the height direction, there is a stopper that comes into contact with the pin inserted on the threading shaft side and matches the height position of the needle hole and the height position of the threading claw, Although it is attached by screwing, etc., there is a problem that the inertia weight of the needle bar becomes heavier due to the increase in the number of parts such as stoppers, which adversely affects inertia on the needle bar moving up and down at high speed. there were.

また、針穴から、ピンが当接するストッパーまでの高さを、糸通し爪からピンまでの高さと同じ高さにしておく必要があるが、このためには、針棒に取り付けるストッパーは、糸通し爪からピンまでの高さにあわせて、針棒途中の正確な高さ位置に取り付けておく必要がある。   In addition, the height from the needle hole to the stopper where the pin abuts must be the same as the height from the threading claw to the pin. For this purpose, the stopper attached to the needle bar must be threaded. It is necessary to attach to the exact height position in the middle of the needle bar according to the height from the threading claw to the pin.

このため、ストッパーやピンなどの各部品には高い加工精度が要求されるし、ストッパーの組み付けにあたっては、測定作業をふくめ高い組み付け精度が要求されて、加工コストのアップは勿論、組み付け工数がも多くなるという問題があった。   For this reason, high processing accuracy is required for each component such as stoppers and pins, and when assembling the stopper, high assembly accuracy is required, including measurement work, as well as increased processing costs and assembly man-hours. There was a problem of increasing.

本発明は、上記のごとき問題に鑑みてなされたものであり、針棒の停止位置にかかわらず、糸通し爪を、ミシン針の針穴に対面する高さ位置に停止、対面させて、一連の糸通し動作が可能な、ミシンの糸通し装置を提供することを技術課題とする。   The present invention has been made in view of the above-described problems. Regardless of the stop position of the needle bar, the threading claw is stopped at the height position facing the needle hole of the sewing needle and is faced. An object of the present invention is to provide a threading device for a sewing machine that can perform the threading operation.

また、このあらかじめ針棒を上死点付近に移動、停止させる機能を削減して、その分、コスト的に有利な、ミシンの糸通し装置を提供することを技術課題とする。   Another object of the present invention is to provide a threading device for a sewing machine that is advantageous in terms of cost by reducing the function of moving and stopping the needle bar in the vicinity of the top dead center in advance.

また、針棒にとりつけられるストッパーと糸通し軸に挿通されるピンの当接によって、鉢棒と糸通し軸の高さ方向の位置あわせる機構を簡素化して、加工スト及び組付け工数を低減する、ミシンの糸通し装置を提供することを技術課題とする。   In addition, the contact mechanism between the stopper attached to the needle bar and the pin inserted through the threading shaft simplifies the mechanism for aligning the height direction of the pot and threading shaft, thereby reducing the processing stroke and assembly man-hours. An object of the present invention is to provide a threading device for a sewing machine.

また、高速に上下動する針棒の慣性重量を低減して、慣性上の悪影響の少ない、ミシンの糸通し装置を提供することを技術課題とする。   It is another object of the present invention to provide a threading device for a sewing machine that reduces the inertia weight of a needle bar that moves up and down at high speed and has less adverse effects on inertia.

上記課題した課題を解決するために、請求項１において講じた技術的手段は、
針穴を有するミシン針を下端に保持して上下動可能な針棒と、前記針棒に並設されて操作レバー及び針穴に係合可能な糸通し爪を保持する上下動可能及び回動可能な糸通し部とを備えて、操作レバーにより糸通し爪を針穴に近接・係合させて上糸の糸通しを行うミシンの糸通し装置において、
前記針棒の上方にあって該針棒上端への当接面を備え前記糸通し部の上方に延材して板状に形成されるストッパーと、前記ストッパーが上端に、前記糸通し部が下端にそれぞれ固着され、前記糸通し部に保持する前記糸通し爪から前記当接面までの高さが前記針穴の中心から前記針棒の上端までの高さと同一の高さに形成される糸通し軸と、前記糸通し軸の高さ方向の途中に配設され、前記糸通し軸を前記針棒とほぼ平行に上下動可能及び回動可能に支承する糸通し軸腕と、前記糸通し軸腕と前記ストッパーとの間にある前記糸通し軸の外周側に配設され、前記ストッパーを前記糸通し軸腕側から上方へ弾性的に付勢する復帰バネとを備えて、前記操作レバーを前記復帰バネに抗して下降し、前記当接面を前記針棒の上端に当接させることにより、前記糸通し爪を前記針穴に対面する高さ位置に停止して、糸通しするようにしたことである。 In order to solve the above-mentioned problem, the technical means taken in claim 1 is:
A needle bar that holds a sewing needle having a needle hole at the lower end and can move up and down, and a needle bar that is arranged in parallel to the needle bar and that can engage with the operation lever and the needle hole can move up and down and rotate. In a threading device for a sewing machine having a threading part that is capable of threading an upper thread by causing a threading claw to approach and engage a needle hole with an operation lever,
A stopper which is above the needle bar and has a contact surface to the upper end of the needle bar and extends above the threading part and is formed in a plate shape, the stopper is at the upper end, and the threading part is The height from the threading claw that is fixed to the lower end and is held by the threading portion to the contact surface is formed to be the same as the height from the center of the needle hole to the upper end of the needle bar. A threading shaft, a threading shaft arm that is disposed midway in the height direction of the threading shaft, and supports the threading shaft so as to be vertically movable and rotatable substantially parallel to the needle bar, and the thread A return spring disposed on an outer peripheral side of the threading shaft between the threading shaft arm and the stopper, and elastically biasing the stopper upward from the threading shaft arm side, The lever is moved down against the return spring to bring the contact surface into contact with the upper end of the needle bar. Ri, stop the threading pawl in height position facing said needle hole, is that which is adapted to the threading.

上記のように、本発明のミシンの糸通し装置は、ミシン針を下端に有して上下動可能に針棒腕に支承される針棒と、該針棒に対してほぼ平行に上下動及び回動可能に糸通し軸腕に支持される糸通し軸と、糸通し軸の上端に固着され、針棒が上下動する上方に延材して針棒の上端に当接自在な当接面を備えるストッパーと、糸通し軸の下端に固着され、操作レバー及び糸通し爪を保持する糸通し部と、糸通し軸腕とストッパーの間にある糸通し軸の外周側に配設され、ストッパーを糸通し軸腕側から上方へ付勢する復帰バネとからなる。   As described above, the threading device for a sewing machine according to the present invention includes a needle bar that has a sewing needle at its lower end and is supported by the needle bar arm so as to be movable up and down, and moves up and down substantially parallel to the needle bar. A threading shaft that is rotatably supported by the threading shaft arm, and an abutment surface that is fixed to the upper end of the threading shaft and extends upward so that the needle bar moves up and down and can freely contact the upper end of the needle bar A stopper provided with a threading shaft fixed to the lower end of the threading shaft and holding the operating lever and threading claw, and a stopper disposed on the outer peripheral side of the threading shaft between the threading shaft arm and the stopper. And a return spring that urges the threading shaft arm side upward.

さらに、糸通し軸側における糸通し爪からストッパーに備える当接面にまでの高さは、針棒側における針穴から上端までの高さと同じ高さになるように形成されている。   Furthermore, the height from the threading claw on the threading shaft side to the contact surface provided on the stopper is formed to be the same as the height from the needle hole to the upper end on the needle bar side.

このような構成によれば、糸通し軸を、復帰バネに抗して、操作レバーにより下降させていくと、ストッパーに備える当接面が、針棒の上端に当接して、糸通し軸の下降が停止する。   According to such a configuration, when the threading shaft is lowered by the operation lever against the return spring, the contact surface provided to the stopper contacts the upper end of the needle bar, and the threading shaft The descent stops.

この糸通し軸が停止している状態では、糸通し爪から当接面までの高さは、針穴から針棒の上端までの高さと同一の高さに形成されているので、針棒の停止位置がどの位置にあっても、常に、糸通し爪の高さ位置は、針穴の高さ位置に一致した状態で、糸通し軸を停止させることが出来る。   When the threading shaft is stopped, the height from the threading claw to the contact surface is the same as the height from the needle hole to the upper end of the needle bar. Regardless of the stop position, the threading shaft can always be stopped in a state where the height position of the threading claw coincides with the height position of the needle hole.

この糸通し爪と針穴の高さ位置を一致した状態で、さらに操作レバーで糸通し部を回動して、従来技術と同様に、糸通し回動機構によって、上糸を掛けた糸通し爪を回動して、ミシン針の針穴に挿通させることにより、上糸を針穴に引き込んで一連の糸通し作業が終了する。   With this threading claw and the needle hole at the same height position, the threading part is further rotated by the operating lever, and the threading thread with the upper thread is threaded by the threading rotation mechanism as in the prior art. By rotating the claw and inserting it into the needle hole of the sewing needle, the upper thread is drawn into the needle hole and the series of threading operations is completed.

つまり、従来技術のように、糸通し作業の前に、針棒を上死点付近に停止させておく必要はなく、本針棒の停止位置がどの位置にあっても、操作レバーによって、糸通し爪の高さ位置は、針穴の高さ位置に一致した状態で糸通し軸を停止させることが出来、その停止位置で、糸通し爪を針穴に近接・係合して糸通しができることが本発明の特徴である。   That is, unlike the prior art, it is not necessary to stop the needle bar near the top dead center before the threading operation. The threading shaft can be stopped with the threading claw height position coincident with the needle hole height position. At that stop position, the threading claw is brought close to and engaged with the needle hole, It is a feature of the present invention that it can be done.

これによれば、糸通し作業の都度、従来技術では必要とした、針棒の高さ位置を、針棒の上死点付近に停止させておくという面倒な作業を省略できるため、糸通し作業が簡単になるという効果がある。   According to this, since the troublesome work of stopping the height position of the needle bar near the top dead center of the needle bar, which is necessary in the prior art, can be omitted every time the threading work is performed. Has the effect of simplifying.

また、従来技術のように、糸通し作業の前に、針棒を上死点付近に停止させておく必要はないので、ミシンの本体側において、この針棒を上死点付近に停止させるための付加機能が必要ではない。   In addition, unlike the prior art, it is not necessary to stop the needle bar near the top dead center before threading, so the needle bar is stopped near the top dead center on the main body side of the sewing machine. No additional functions are required.

したがって、このための部品が削減できて、この分、ミシンの本体の構成が簡素化され、コスト低減につながるという効果がある。   Therefore, the parts for this purpose can be reduced, and the structure of the main body of the sewing machine can be simplified correspondingly, leading to cost reduction.

また、高速に上下往復運動する針棒には、従来技術のように、針棒の高さ方向途中に、針棒と糸通し軸の高さ位置をあわせるためのストッパーを取り付ける必要はなく、直接、糸通し軸の上端に固着するストッパーが、針棒の上端に当接するようになっている。   In addition, the needle bar that reciprocates up and down at high speed does not need to be equipped with a stopper for adjusting the height position of the needle bar and the threading shaft in the middle of the needle bar height, as in the prior art. A stopper fixed to the upper end of the threading shaft comes into contact with the upper end of the needle bar.

この結果、高速に上下往復動する針棒の慣性重量が、ストッパーやネジ止め部品の分、軽減されて、針棒を連結される針棒駆動機構などへの慣性上の悪影響が少なくなるとともに、振動・騒音なども低減できるという効果がある。   As a result, the inertial weight of the needle bar that reciprocates up and down at high speed is reduced by the amount of the stopper and screwing parts, and the adverse influence on the inertia to the needle bar drive mechanism to which the needle bar is connected is reduced. There is an effect that vibration and noise can be reduced.

また、ストッパーは、糸通し軸の上端に取り付けられるが、あらかじめ、高さ方向に所定寸法で加工されている糸通し軸の上端に取り付けて、針棒上端に、直接、当接させる単純な構成になっている。   In addition, the stopper is attached to the upper end of the threading shaft, but is simply attached to the upper end of the threading shaft that has been machined to a predetermined dimension in the height direction and directly contacts the upper end of the needle bar. It has become.

したがって、従来技術のような、糸通し軸側の高さ方向途中に挿通されるピンに針棒側の高さ途中に固着されるストッパーを当接して、糸通し爪からピンまでの高さと、針穴からストッパーまでの高さを、正確に合わせるために必要とした、ストッパーやピンなどの各部品に対する高い加工精度や、測定作業を含めた高い組み付け精度が緩和され、また、糸通し軸側のピンも削減されて単純な構成になっているので、加工コスト及び組付け工数が低減できるという効果がある。   Therefore, as in the prior art, a stopper inserted in the middle of the height on the needle bar side is brought into contact with a pin inserted in the middle of the height direction on the threading shaft side, and the height from the threading claw to the pin, The high processing accuracy for each part such as stoppers and pins and high assembly accuracy, including measurement work, required to accurately adjust the height from the needle hole to the stopper are eased. Since the number of pins is reduced and the structure is simple, there is an effect that the processing cost and the number of assembling steps can be reduced.

以下、本発明に係わる、実施形態例を、図面を参照して、より具体的に説明する。   Embodiments according to the present invention will be described below more specifically with reference to the drawings.

図１（ａ）は、本発明の実施形態例に係わる、ミシンの糸通し装置の主要部の、糸通し動作中の終期位置となり、糸通し軸が、これの下降端に到達している形態を示す概念図である。図１（ｂ）は、本発明の実施形態例に係わる、ミシンの糸通し装置の主要部の、糸通し動作前の初期位置であり、糸通し軸が、これの上昇端に到達している形態を示す概念図である。   FIG. 1A shows an end position of the main part of the threading device of the sewing machine according to the embodiment of the present invention during the threading operation, and the threading shaft reaches the descending end thereof. FIG. FIG. 1B is an initial position of the main part of the threading device of the sewing machine according to the embodiment of the present invention before the threading operation, and the threading shaft has reached its rising end. It is a conceptual diagram which shows a form.

図１に示すように、Ａは、ミシン機枠２に取り付けられる針棒機構を示し、Ｂは、針棒機構Ａに並設して配置され、同じようにミシン機枠２に取り付けられる糸通し機構を示めしている。   As shown in FIG. 1, A shows a needle bar mechanism attached to the sewing machine frame 2, and B shows a threader that is arranged in parallel with the needle bar mechanism A and is similarly attached to the sewing machine frame 2. The mechanism is shown.

図１において、針棒機構Ａは、針棒１と、針棒１をミシン機枠２に支持する針棒腕３と、針棒１に連結して、針棒駆動機構４からの上下往復運動を伝達する針棒抱き５と、針穴９を備え針棒１の下端に針止め６を介して固着されるミシン針７で構成される。   In FIG. 1, the needle bar mechanism A is connected to the needle bar 1, the needle bar arm 3 that supports the needle bar 1 on the sewing machine frame 2, and the needle bar 1, and the vertical movement from the needle bar drive mechanism 4. And a sewing needle 7 which has a needle hole 9 and is fixed to the lower end of the needle bar 1 via a needle stopper 6.

針棒機構Ａでは、針棒１を針棒駆動機構４によって上下往復運動して、針棒に固着するミシン針７を、高速に上下往復動する。   In the needle bar mechanism A, the needle bar 1 is reciprocated up and down by the needle bar drive mechanism 4, and the sewing needle 7 fixed to the needle bar is reciprocated up and down at high speed.

なお、針棒機構Ａでは、針棒１は、ミシン針１の針穴９が、図示しない縫製布の上方にあって、上下動する範囲内の適当な高さ位置に停止している。   In the needle bar mechanism A, the needle bar 1 is stopped at an appropriate height position within a range in which the needle hole 9 of the sewing needle 1 is above a sewing cloth (not shown) and moves up and down.

針棒１は、高さ方向に上、下端を有する縦長に所定の長さ寸法で形成され、下端には、針止め６が固着される。   The needle bar 1 is formed in a vertically long shape having an upper end and a lower end in the height direction, and a needle stopper 6 is fixed to the lower end.

また、針棒１は、ミシン機枠２に取り付けられる２箇所の針棒腕３によって、上下往復運動可能に案内される。   The needle bar 1 is guided by two needle bar arms 3 attached to the sewing machine frame 2 so as to be capable of reciprocating up and down.

針止め６は、ミシン針７を、針棒１の下端に脱着可能に固着している
針棒腕３は、針棒抱き５の両側で、ミシン機枠２に取り付けられると共に、従来技術と同様に、針棒１を嵌装する貫通孔を備えて、針棒１を、図示しない、軸受け等を介して、上下往復運動可能に支承している。 The needle stopper 6 fixes the sewing needle 7 to the lower end of the needle bar 1 so as to be detachable. The needle bar arm 3 is attached to the sewing machine frame 2 on both sides of the needle bar holder 5 and is the same as in the prior art. In addition, a through-hole into which the needle bar 1 is fitted is provided, and the needle bar 1 is supported so as to be capable of reciprocating vertically through a bearing or the like (not shown).

なお図１では、針棒腕３は、ミシン機枠２に対して、２個所取り付けられているが、２箇所に限定されるものではなく、１箇所でもまた３箇所以上でもよい。   In FIG. 1, the needle bar arm 3 is attached to the sewing machine frame 2 at two locations, but is not limited to two locations, and may be one location or three or more locations.

針棒抱き５は、従来技術と同様に、針棒１を嵌装する貫通孔を備えて、該貫通穴に、図示しない、ネジ止めなどで、針棒１の高さ方向途中に固定される。   The needle bar holder 5 includes a through hole in which the needle bar 1 is fitted, and is fixed to the through hole in the middle of the needle bar 1 in the height direction by screwing or the like (not shown). .

また、針棒抱き５は、針棒１を支承する２箇所の針棒腕３の間に配設され、リンク８を介して針棒駆動機構４に連結されて、針棒１に、上下往復運動を伝達する。   The needle bar holder 5 is disposed between the two needle bar arms 3 that support the needle bar 1 and is connected to the needle bar drive mechanism 4 via the link 8 so as to reciprocate up and down the needle bar 1. Communicate exercise.

針棒駆動機構４は、従来技術と同様に、図示しない、モータで駆動され、リンク８によって回転運動を上下往復運動に変換し、針棒１に、上下往復運動を伝達する
ミシン針７は、従来技術と同様に、針穴９を備える定形のミシン針で、針棒１の下端に備える針止め６に、脱着自在に固着されて、ミシン針７の針穴から針棒１の上端までの高さは、所定の高さ寸法になっている。 The needle bar drive mechanism 4 is driven by a motor (not shown) as in the prior art and converts the rotary motion into the vertical reciprocating motion by the link 8 and transmits the vertical reciprocating motion to the needle bar 1. Similar to the prior art, a fixed sewing needle having a needle hole 9 is detachably fixed to a needle stop 6 provided at the lower end of the needle bar 1, so that it extends from the needle hole of the sewing needle 7 to the upper end of the needle bar 1. The height is a predetermined height dimension.

次に、糸通し機構Ｂは、糸通し軸１０と、糸通し軸１０をミシン機枠２に支持する糸通し軸腕１１と、糸通し軸１０の上端に取り付けられ、針棒１の上方に延材して針棒１への当接面１３を有する板状のストッパー１２と、操作レバー１４と糸通し爪１５を保持し、糸通し軸１０の下端に取り付けられる糸通し部１６と、糸通し軸腕１１とストッパー１２との間にある糸通し軸の外周側に配設する復帰バネ１７で構成される。   Next, the threading mechanism B is attached to the upper end of the threading shaft 10, the threading shaft arm 11 that supports the threading shaft 10 on the sewing machine frame 2, and the upper end of the threading shaft 10. A plate-like stopper 12 having a contact surface 13 that contacts the needle bar 1, a threading portion 16 that holds the operation lever 14 and the threading claw 15 and is attached to the lower end of the threading shaft 10, and a thread The return spring 17 is disposed on the outer peripheral side of the threading shaft between the threading shaft arm 11 and the stopper 12.

糸通し機構Ｂでは、操作レバー１４を下降させることによって、図１（ａ）に示すように、ストッパー１２の当接面１３が、針棒１の上端に当接して、糸押し部１６を、針穴９に対面させる高さ位置に停止させるとともに、更に操作レバーにより、糸通し部１６を、図示しない、糸通し回動部によって回動して、針穴９に対面、係合させて糸通しを行う。   In the threading mechanism B, when the operation lever 14 is lowered, the contact surface 13 of the stopper 12 contacts the upper end of the needle bar 1 as shown in FIG. While stopping at the height position facing the needle hole 9, the threading portion 16 is further rotated by the threading rotation portion (not shown) by the operation lever so as to face and engage the needle hole 9. Thread through.

なお、上記糸通し機構Ｂにおいて、この糸通し部１６を回動させて針穴９に上糸の糸通しを行う、糸通し回動部は、従来技術と同様の構成、作用にあるので、以下では、この糸通し回動部の説明は省略する。   In the threading mechanism B, the threading part 16 rotates the threading part 16 to thread the upper thread into the needle hole 9. The threading rotation part has the same configuration and operation as the conventional technique. Below, description of this threading rotation part is abbreviate | omitted.

糸通し軸１０は、高さ方向に上、下端を有する縦長に形成され、上端には、図示しないネジ止めなどで、ストッパー１２が、また下端には、図示しないネジ止めなどで、操作レバー１４と糸通し爪１５を保持する糸通し部１６が固着されている。   The threading shaft 10 is formed in a vertically long shape having an upper end and a lower end in the height direction. The upper end is fixed with a screw (not shown) or the like, and the stopper 12 is attached to the lower end with a screw (not shown). The threading portion 16 that holds the threading claw 15 is fixed.

また、糸通し軸１０は、ミシン機枠の取り付けられる２箇所の糸通し軸腕１１によって、針棒１とほぼ平行に並設されて、上下動可能及び回動可能にミシン機枠に案内される。   The threading shaft 10 is arranged in parallel with the needle bar 1 by two threading shaft arms 11 to which the sewing machine frame is attached, and is guided to the sewing machine frame so as to be vertically movable and rotatable. The

また、糸通し軸１０の上下動方向の高さ寸法は、下端に取り付けられる糸通し部１６が保持する糸通し爪１５から、上端に取り付けられるストッパー１２の当接面１３までの高さが、ミシン針７の針穴０から、針棒１の上端までの高さと同じ高さになるような寸法に形成される。   The height dimension of the threading shaft 10 in the vertical movement direction is such that the height from the threading claw 15 held by the threading portion 16 attached to the lower end to the contact surface 13 of the stopper 12 attached to the upper end is as follows. The sewing needle 7 is formed to have the same height as the height from the needle hole 0 of the sewing needle 7 to the upper end of the needle bar 1.

糸通し軸腕１１は、糸通し軸１０を嵌装する貫通孔を備えて、該貫通穴に嵌装
する糸通し軸１０を、図示しない、軸受け等を介して、上下運動可能及び回動可能に、ミシン機枠２に支承している。 The threading shaft arm 11 includes a through-hole into which the threading shaft 10 is fitted, and the threading shaft 10 to be fitted into the through-hole can be vertically moved and rotated via a bearing (not shown). In addition, it is supported on the sewing machine frame 2.

ストッパー１２は、糸通し軸１０と、ほぼ平行に並設されている針棒１の上方に延材されて、針棒１の上端に当接する当接面１３を有するような板状に形成される。   The stopper 12 is formed in the shape of a plate having a contact surface 13 that extends above the needle bar 1 arranged in parallel with the threading shaft 10 and contacts the upper end of the needle bar 1. The

このストッパー１２では、糸通し作業のために、操作レバー１４に指をかけて操作すると、図１（ａ）に示すように、まず、当接面１３が、針棒１の上端に当接して糸通し軸１０の下降が停止するが、この糸通し軸１０の停止位置においては、糸通し軸１０側の糸通し爪１５から当接面１３までの高さは、針棒１側の針穴９から針棒１の上端までの高さと同じ高さに形成されているので、糸通し爪１５の高さ位置と針穴９の高さ位置は同じ高さにある。   In this stopper 12, when the operation lever 14 is operated with a finger for threading operation, the contact surface 13 first comes into contact with the upper end of the needle bar 1 as shown in FIG. The descent of the threading shaft 10 stops. At the stop position of the threading shaft 10, the height from the threading claw 15 on the threading shaft 10 side to the contact surface 13 is the needle hole on the needle bar 1 side. Since the height from 9 to the upper end of the needle bar 1 is formed, the height position of the threading claw 15 and the height position of the needle hole 9 are the same height.

糸通し部１６は、従来技術と同じように、糸通し軸１０の下端に、針棒１の運動軌跡の外側に位置するように取りつけられて、操作レバー１４及び針穴９に係合可能な糸通し爪１５を保持する状態で、糸通し軸１０とともに上下動可能及び回動可能になっている。   The threading portion 16 is attached to the lower end of the threading shaft 10 so as to be located outside the movement locus of the needle bar 1 and can be engaged with the operation lever 14 and the needle hole 9 in the same manner as in the prior art. In a state where the threading claw 15 is held, it can be moved up and down and rotated together with the threading shaft 10.

この糸通し部１６では、当接面１３が針棒１の上端に当接して、糸通し爪１５の高さ位置と針穴９の高さ位置が同じ高さにある状態で、さらに操作レバー１４を操作すると、従来技術と同様に、糸通し部１６が、図示しない、糸通し回動部により回動されて、糸通し爪１５が、ミシン針７の針穴９に対面、係合して糸通しが行われる。   In this threading portion 16, the contact surface 13 is in contact with the upper end of the needle bar 1 and the height of the threading claw 15 and the height of the needle hole 9 are the same height, and the operation lever 14 is operated, the threading portion 16 is rotated by a threading rotation portion (not shown), and the threading claw 15 is brought into engagement with the needle hole 9 of the sewing needle 7 in the same manner as in the prior art. Threading is performed.

復帰バネ１７は、ストッパー１２に対面する糸通し軸腕１１とストッパー１２との間にある糸通し軸１０の外周側に配設され、糸通し軸１０が、これの上昇端に到達していない状態では、糸通し軸１０を、ストッパー１２を介して糸通し軸腕１１側から上方、つまり矢印Ｙ１方向に弾性的に付勢している。   The return spring 17 is disposed on the outer peripheral side of the threading shaft 10 between the threading shaft arm 11 facing the stopper 12 and the stopper 12, and the threading shaft 10 does not reach the rising end thereof. In this state, the threading shaft 10 is elastically biased upward from the threading shaft arm 11 side, that is, in the direction of the arrow Y1 via the stopper 12.

このため、操作レバー１４が操作されていない糸通し作業前の初期状態では、糸通し軸１０は、図１（ｂ）に示すように、復帰バネ１７により、上方、つまり矢印Ｙ１方向に持ち上げられて、糸通し部１６と共に、糸通し軸１０の上昇端に到達している。
また、操作レバー１４を下降させて、糸通し作業の進行状態では、糸通し軸１０は、図１（ａ）に示すように、復帰バネ１７が圧縮されて、下方、つまり，矢印Ｙ２方向に下降して、糸通し部１６とともに、糸通し軸１０の下降端に到達している。 For this reason, in the initial state before the threading operation where the operation lever 14 is not operated, the threading shaft 10 is lifted upward, that is, in the direction of the arrow Y1 by the return spring 17, as shown in FIG. Thus, together with the threading part 16, it reaches the rising end of the threading shaft 10.
Further, when the operation lever 14 is lowered and the threading operation is in progress, the threading shaft 10 is compressed downward, that is, in the direction of the arrow Y2, as shown in FIG. It descends and reaches the descending end of the threading shaft 10 together with the threading portion 16.

そして、この糸通し軸１０が下降端に到達して停止する位置では、当接面１３が針棒１の上端に当接して、上記したように、糸通し軸１０側の糸通し爪１５から当接面１３までの高さは、針棒１側のミシン針７の針穴９から針棒１の上端までの高さと同じ高さに形成されているので、糸通し爪１５の高さ位置と、針穴９の高さ位置が、同じ高さ位置になって、糸通し爪１５が、ミシン針７の針穴９に対面、係合する。   At the position where the threading shaft 10 reaches the descending end and stops, the contact surface 13 contacts the upper end of the needle bar 1 and, as described above, from the threading claw 15 on the threading shaft 10 side. Since the height to the contact surface 13 is the same as the height from the needle hole 9 of the sewing needle 7 on the needle bar 1 side to the upper end of the needle bar 1, the height position of the threading claw 15 is formed. Then, the height position of the needle hole 9 becomes the same height position, and the threading claw 15 faces and engages with the needle hole 9 of the sewing needle 7.

つぎに、以上のように構成された糸通し装置による糸通しの作業手順について説明する。   Next, an operation procedure of threading by the threading device configured as described above will be described.

針穴９が、図示しない、縫製布より上部の、適当な位置で、針棒１が停止している状態で、図１（ｂ）に示すように、糸通し機構Ｂ側において、糸通し軸１０が、復帰バネ１７によって、その上昇端に到達している時、操作レバー１４に指をかけて、糸通し軸１０を、下方つまり、矢印Ｙ２方向に押し下げる。   In a state where the needle bar 1 is stopped at an appropriate position above the sewing cloth (not shown), the needle hole 9 is stopped on the threading mechanism B side as shown in FIG. When 10 reaches the rising end by the return spring 17, the finger is applied to the operation lever 14 to push the threading shaft 10 downward, that is, in the direction of the arrow Y2.

すると、糸通し軸１０は、復帰バネ１７のバネ力に抗して、糸通し部１６およびストッパー１２と共に、矢印Ｙ２方向に下降する。   Then, the threading shaft 10 moves down in the arrow Y2 direction together with the threading portion 16 and the stopper 12 against the spring force of the return spring 17.

この場合、糸通し軸１０は、糸通し軸腕１１によって、針棒１にほぼ平行に上下動可能に支持されているので、針棒１に対して、ほぼ平行に下降する。   In this case, since the threading shaft 10 is supported by the threading shaft arm 11 so as to be movable up and down substantially parallel to the needle bar 1, the threading shaft 10 descends substantially parallel to the needle bar 1.

この糸通し軸１０がある程度下降すると、図１（ａ）に示すように、糸通し軸１０の上端に固着するストッパー１２に形成されている当接面１３が、針棒１の上端に、上方から当接し、糸通し軸１０のそれ以上の下降が妨げられて、糸通し軸１０は停止する。   When the threading shaft 10 is lowered to some extent, as shown in FIG. 1A, the contact surface 13 formed on the stopper 12 fixed to the upper end of the threading shaft 10 moves upward on the upper end of the needle bar 1. The threading shaft 10 stops, and further lowering of the threading shaft 10 is prevented, and the threading shaft 10 stops.

この停止位置では、針棒１の停止位置が、針棒１の上下動する範囲内のどの高さ位置にあっても、糸通し機構Ｂ側における、糸通し爪１６からストッパー１２に形成されている当接面１３までの高さは、針棒機構Ａ側における、針穴９から針棒１の上端までの高さと同じ高さに形成されているので、糸通し爪１６の高さ位置は、針穴９の高さ位置に一致して、糸通し爪１６は、針穴９に対面し、針穴９に係合可能な状態になる。   At this stop position, the needle bar 1 is formed on the stopper 12 from the threading claw 16 on the threading mechanism B side at any height position within the range in which the needle bar 1 moves up and down. Since the height to the contact surface 13 is the same as the height from the needle hole 9 to the upper end of the needle bar 1 on the needle bar mechanism A side, the height position of the threading claw 16 is In accordance with the height position of the needle hole 9, the threading claw 16 faces the needle hole 9 and becomes engageable with the needle hole 9.

この停止位置で、さらに操作レバー１４を指先で、矢印Ｙ２方向に押すと、ストッパー１２の当接面１３は、針棒１の上端に当接しているので、糸通し軸１０は、これ以上、下降することなく、以下、従来技術と同じ構成にあって、図示しない、糸通し回動部が作動して糸通し部１６が回動する。   When the operating lever 14 is further pushed in the arrow Y2 direction with the fingertip at this stop position, the contact surface 13 of the stopper 12 is in contact with the upper end of the needle bar 1, so that the threading shaft 10 is Without descending, the threading rotation part (not shown) is operated to rotate the threading part 16 in the same configuration as that of the prior art.

そしてよく知られているように、この糸通し部１６の回動によって、糸通し部１６が針棒１に近接、対面し、糸通し爪１５が、針穴９に挿通した後、糸通し爪１５に上糸を掛け、操作レバー１４を戻していくと、糸通し爪１５が上糸を引っ掛けた状態で針穴９を通って、糸通しが行われる。   As is well known, the rotation of the threading portion 16 causes the threading portion 16 to approach and face the needle bar 1, and after the threading claw 15 is inserted into the needle hole 9, the threading claw When the upper thread is applied to 15 and the operation lever 14 is returned, the threading claw 15 passes through the needle hole 9 with the upper thread hooked, and threading is performed.

一方、針穴９が縫製布より下方にある状態で、針棒１が停止している時では、操作レバー１４を操作して糸通し軸１０をある程度下降させると、上記したように、糸通し爪１５から当接面１３までの高さは、針穴９から針棒１の上端までの高さと同じ高さに形成されているので、糸通し爪１５が、針穴９に対面する位置に下降する前に、糸通し爪１５を保持する糸通し部１６が、縫製布に当接して、糸通し軸１０は、それ以上の下降が妨げられる。   On the other hand, when the needle bar 1 is stopped while the needle hole 9 is below the sewing cloth, if the operating lever 14 is operated to lower the threading shaft 10 to some extent, the threading thread as described above. Since the height from the claw 15 to the contact surface 13 is the same as the height from the needle hole 9 to the upper end of the needle bar 1, the threading claw 15 is located at a position facing the needle hole 9. Before the lowering, the threading portion 16 that holds the threading claw 15 comes into contact with the sewing cloth, and the further lowering of the threading shaft 10 is prevented.

この停止位置ではもちろん、糸通し爪１５の高さ位置は、針穴９の高さ位置より上にあって糸通し作業は出来ないので、この場合には、針棒１を、針穴９が縫製布より上方になるような、適当な高さ位置に上昇させておけばよい。   In this stop position, of course, the height of the threading claw 15 is higher than the height of the needle hole 9 and the threading operation cannot be performed. What is necessary is just to raise to a suitable height position so that it may become above a sewing cloth.

この針穴９の高さ位置を、縫製布より上方になるように針棒を上昇させる作業自体は、容易な作業であり、特に問題となるものではないし、針穴に上糸を通す作業をする上では、当然ながら針穴は、つねに縫製布より上方にしておく必要がある。   The operation itself of raising the needle bar so that the height position of the needle hole 9 is above the sewing cloth is an easy operation and does not cause any particular problem. Of course, the needle hole must always be above the sewing cloth.

また、糸通し部１６が、縫製布に当接している状態で、さらに操作レバー１４を押すと、糸通し部１６は、それ以上の下降が妨げられて回動しようとするが、この時、操作レバー１４から指を離すことにより、糸通し部１６は、無理な力や損傷を与えられることなく安全に、糸通し軸１０と共に、復帰バネ１７によって糸通し軸腕１１からＹ１方向に付勢されて、上昇端に戻すことができる。   Further, when the operation lever 14 is further pressed in a state where the threading portion 16 is in contact with the sewing cloth, the threading portion 16 is prevented from further descending and tries to rotate. By releasing the finger from the operation lever 14, the threading portion 16 is safely urged in the Y1 direction from the threading shaft arm 11 by the return spring 17 together with the threading shaft 10 without being subjected to excessive force or damage. And can be returned to the rising edge.

上記したように、糸通し爪１５が取り付けられている糸通し軸１０を、針棒１の上下動に連動させて、糸通し爪１５の高さ位置を、針穴９の高さ位置にあわせるにあたって、従来技術では、あらかじめ判っている針棒の上死点の高さ位置を基準にして、針棒の高さ方向途中に取り付けられているストッパーに、糸通し軸の高さ方向途中に挿通されているピンを当接させるようにしているので、糸通し作業の都度、針棒を上死点付近に停止させておく必要があった。   As described above, the threading shaft 10 to which the threading claw 15 is attached is interlocked with the vertical movement of the needle bar 1 to adjust the height position of the threading claw 15 to the height position of the needle hole 9. In the prior art, the needle bar is inserted halfway in the height direction of the threading shaft into the stopper attached in the middle of the needle bar in the height direction with reference to the height position of the top dead center of the needle bar. Since the pin is in contact with each other, it is necessary to stop the needle bar near the top dead center every time the threading operation is performed.

本実施形態例によれば、針棒１の上端に、糸通し軸１０の上端に固着するストッパー１２の当接面１３を、直接、当接することにより、針穴９と糸通し爪１５の高さ方向の位置を、同じ高さ位置になるようにしている。   According to the present embodiment, the abutment surface 13 of the stopper 12 fixed to the upper end of the threading shaft 10 is brought into direct contact with the upper end of the needle bar 1, thereby increasing the height of the needle hole 9 and the threading claw 15. The position in the vertical direction is set to the same height position.

したがって、針穴９が縫製布の上方にある状態のもとでは、上下動する針棒１の停止位置が、針棒１の上下動する範囲のどの高さ位置にあっても、常に、操作レバー１４の操作だけで、針穴９と糸通し爪１５の高さ方向の位置を、同じ高さ位置に合わせる事が出来るので、一連の糸通し動作が簡素化され、かつ容易になる。   Therefore, under the condition that the needle hole 9 is above the sewing cloth, the needle bar 1 that moves up and down is always operated regardless of the height of the needle bar 1 that moves up and down. Since the position in the height direction of the needle hole 9 and the threading claw 15 can be adjusted to the same height position only by operating the lever 14, a series of threading operations are simplified and facilitated.

（ａ）は、本発明の実施形態例に係わる、ミシンの糸通し装置の主要部の、糸通し動作中の終期位置となり、糸通し軸が下降端に到達している形態を示す概念図。(A) is the conceptual diagram which shows the form which becomes the final position in the threading operation | movement of the principal part of the threading apparatus of a sewing machine concerning the example of embodiment of this invention, and the threading shaft has reached the falling end.

（ｂ）は、本発明の実施形態例に係わる、ミシンの糸通し装置の主要部の、糸通し動作前の初期位置であり、糸通し軸が上昇端に到達している形態を示す概念図   (B) is a conceptual view showing an initial position of the main part of the threading device of the sewing machine according to the embodiment of the present invention before the threading operation and the threading shaft reaching the rising end.

符号の説明Explanation of symbols

１・・・針棒
２・・・ミシン機枠
３・・・針棒腕
４・・・針棒駆動機構
５・・・針棒抱き
６・・・針止め
７・・・ミシン針
８・・・リンク
９・・・針穴
１０・・糸通し軸
１１・・糸通し軸腕
１２・・ストッパー
１３・・当接面
１４・・操作レバー
１５・・糸通し爪
１６・・糸通し部
１７・・復帰バネ
Ａ・・・針棒駆動機構
Ｂ・・・糸通し機構 DESCRIPTION OF SYMBOLS 1 ... Needle bar 2 ... Sewing machine frame 3 ... Needle bar arm 4 ... Needle bar drive mechanism 5 ... Needle bar holding 6 ... Needle stopper 7 ... Sewing needle 8 ... -Link 9 ... Needle hole 10-Threading shaft 11-Threading shaft arm 12-Stopper 13-Contact surface 14-Operation lever 15-Threading claw 16-Threading portion 17-・ Return spring A ... Needle bar drive mechanism B ... Threading mechanism

Claims (1)

針穴を有するミシン針を下端に保持して上下動可能な針棒と、前記針棒に並設されて操作レバー及び針穴に係合可能な糸通し爪を保持する上下動可能及び回動可能な糸通し部とを備えて、操作レバーにより糸通し爪を針穴に近接・係合させて上糸の糸通しを行うミシンの糸通し装置において、
前記針棒の上方にあって該針棒上端への当接面を備え前記糸通し部の上方に延材して板状に形成されるストッパーと、前記ストッパーが上端に、前記糸通し部が下端にそれぞれ固着され、前記糸通し部に保持する前記糸通し爪から前記当接面までの高さが前記針穴の中心から前記針棒の上端までの高さと同一の高さに形成される糸通し軸と、前記糸通し軸の高さ方向の途中に配設され、前記糸通し軸を前記針棒とほぼ平行に上下動可能及び回動可能に支承する糸通し軸腕と、前記糸通し軸腕と前記ストッパーとの間にある前記糸通し軸の外周側に配設され、前記ストッパーを前記糸通し軸腕側から上方へ弾性的に付勢する復帰バネとを備えて、前記操作レバーを前記復帰バネに抗して下降し、前記当接面を前記針棒の上端に当接させることにより、前記糸通し爪を前記針穴に対面する高さ位置に停止して、糸通しすることを特徴とするミシンの糸通し装置 A needle bar that holds a sewing needle having a needle hole at the lower end and can move up and down, and a needle bar that is arranged in parallel to the needle bar and that can engage with the operation lever and the needle hole can move up and down and rotate. In a threading device for a sewing machine having a threading part that is capable of threading an upper thread by causing a threading claw to approach and engage a needle hole with an operation lever,
A stopper which is above the needle bar and has a contact surface to the upper end of the needle bar and extends above the threading part and is formed in a plate shape, the stopper is at the upper end, and the threading part is The height from the threading claw that is fixed to the lower end and is held by the threading portion to the contact surface is formed to be the same as the height from the center of the needle hole to the upper end of the needle bar. A threading shaft, a threading shaft arm that is disposed midway in the height direction of the threading shaft, and supports the threading shaft so as to be vertically movable and rotatable substantially parallel to the needle bar, and the thread A return spring disposed on an outer peripheral side of the threading shaft between the threading shaft arm and the stopper, and elastically biasing the stopper upward from the threading shaft arm side, The lever is moved down against the return spring to bring the contact surface into contact with the upper end of the needle bar. Ri, stop the threading pawl in height position facing said needle hole, threading the sewing machine, characterized in that the threading device

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