JP4294435B2 - sewing machine - Google Patents

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JP4294435B2
JP4294435B2 JP2003358158A JP2003358158A JP4294435B2 JP 4294435 B2 JP4294435 B2 JP 4294435B2 JP 2003358158 A JP2003358158 A JP 2003358158A JP 2003358158 A JP2003358158 A JP 2003358158A JP 4294435 B2 JP4294435 B2 JP 4294435B2
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sewing
sewing needle
thread
gathering
yarn
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JP2005118380A (en
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眞一 坂本
文彦 吉田
安志 小野
洋 小田
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Juki株式会社
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本発明は、ミシンに関する。   The present invention relates to a sewing machine.
従来、衣服の布地にボタンを単糸環縫いによって縫製する単糸環縫いミシンがある。この単糸環縫いミシンは、糸寄せ部材を備えており、例えば図10に示すものが知られている。ここで、図10(a)は平面図、図10(b)は正面図、図10(c)は側面図である。縫い針81が下死点に達する直前において、詳しくは縫い針81の先端が糸寄せ部材82の上面と略面一になったタイミングで、糸寄せ部材82がA方向に移動することにより、その先端の糸寄せ部82aで2本の縫い糸を引っ掛け、糸寄せ部82aの最深部の稜線82bに寄せ集める。このとき、寄せ集められた2本の縫い糸83a,83bは縫い針81の上下動経路に対して傾斜した姿勢で、その上下動経路の側方に退避することになる。したがって、2本の縫い糸83a,83bの上方部分が互いに寄せられた状態で、縫い針81の上下動経路の側方側に変位し、これによって、縫い針81が2本の縫い糸83a,83bの間に落ち込むのを防止するようにしている(例えば、特許文献1参照。)。
特開平11−19361号公報
2. Description of the Related Art Conventionally, there is a single thread chain stitch sewing machine that sews a button on a cloth of clothes by a single thread ring stitch. This single thread chain stitch sewing machine is provided with a thread shifting member, and for example, the one shown in FIG. 10 is known. Here, FIG. 10A is a plan view, FIG. 10B is a front view, and FIG. 10C is a side view. Immediately before the sewing needle 81 reaches the bottom dead center, when the tip of the sewing needle 81 is substantially flush with the upper surface of the thread gathering member 82, the thread gathering member 82 moves in the A direction. Two sewing threads are hooked by the thread gathering portion 82a at the tip, and gathered to the ridgeline 82b at the deepest part of the yarn gathering portion 82a. At this time, the two sewing threads 83 a and 83 b gathered together are retracted to the side of the vertical movement path in a posture inclined with respect to the vertical movement path of the sewing needle 81. Therefore, in a state where the upper portions of the two sewing threads 83a and 83b are brought close to each other, the sewing needle 81 is displaced to the side of the vertical movement path, whereby the sewing needle 81 is moved to the two sewing threads 83a and 83b. It is made to prevent falling in between (for example, refer patent document 1).
Japanese Patent Laid-Open No. 11-19361
ところで、糸寄せ部材82は、無駄な移動を無くすために、必要最小限の距離だけ動くようになっている。すなわち、糸寄せ部材82がA方向に移動する際においても、縫い針81の上下動経路をぎりぎりでかわす程度にしか移動しない。このため、縫い糸83a,83bの張力により縫い針81の先端が曲げられると、縫い針81が下降した場合に先端が糸寄せ部材82に接触し、縫い針81が折れるという問題があった。   By the way, the yarn shifting member 82 is moved by a necessary minimum distance in order to eliminate unnecessary movement. In other words, even when the yarn moving member 82 moves in the A direction, it moves only to the extent that the vertical movement path of the sewing needle 81 is barely displaced. For this reason, when the tip of the sewing needle 81 is bent by the tension of the sewing threads 83a and 83b, there is a problem in that when the sewing needle 81 is lowered, the tip contacts the thread shifting member 82 and the sewing needle 81 is broken.
そこで、本発明の課題は、縫い針の下降時に先端が糸寄せ部材に接触することを防止するミシンを提供することである。   Therefore, an object of the present invention is to provide a sewing machine that prevents the tip from coming into contact with the thread gathering member when the sewing needle is lowered.
以上の課題を解決するため、請求項1に記載の発明は、
上下に往復動する縫い針と、
前記縫い針が下死点から上昇する際に縫い糸のループを拾い取るルーパと、
前記ルーパの上方に配置され、前記縫い針が下降する際に前記ルーパと布地の間に掛け渡された2本の縫い糸の途中部分を寄せ集めて前記縫い針の上下動経路から退避させる糸寄せ部と、前記縫い針が上昇する際に前記縫い針との間に縫い針の針穴に通された縫い糸の一方を挟み込む挟持部とを有し、待機位置から所定の移動経路を経て前記糸寄せ部による糸の寄せ集めと前記挟持部による糸の挟み込みが行われる糸寄せ位置に移動する糸寄せ部材と、
前記糸寄せ部材を前記所定の移動経路に沿って移動させる駆動機構と、を備えたミシンであって、
前記駆動機構は、前記糸寄せ部材を、下降する前記縫い針の先端が前記糸寄せ部材に到達する前に前記糸寄せ位置に移動させて、その後前記縫い針の先端が前記糸寄せ部材の側方を通過する前に前記縫い針の上下動経路から隔離させる隔離位置に移動させることにより縫い針との接触を防止し、さらに前記縫い針が下死点から上昇する前に前記糸寄せ位置に復帰させることにより縫い針の針穴に通された縫い糸を挟持させることを特徴とする。
In order to solve the above problems, the invention described in claim 1
A sewing needle that reciprocates up and down;
A looper that picks up a loop of sewing thread when the sewing needle ascends from bottom dead center;
Thread gathering arranged above the looper and gathering together the middle portions of the two sewing threads stretched between the looper and the fabric when the sewing needle descends and retracts from the vertical movement path of the sewing needle And a clamping part for sandwiching one of the sewing threads passed through the needle hole of the sewing needle between the sewing needle and the sewing needle when the sewing needle is raised, and passing through the predetermined movement path from the standby position. A yarn gathering member that moves to a yarn gathering position where yarn gathering by the gathering unit and yarn clamping by the clamping unit are performed;
A sewing machine comprising: a drive mechanism that moves the yarn shifting member along the predetermined movement path;
The drive mechanism moves the thread gathering member to the thread gathering position before the tip of the descending sewing needle reaches the thread gathering member, and then the tip of the sewing needle is moved to the side of the thread gathering member. Is moved to an isolation position that is isolated from the vertical movement path of the sewing needle before passing the direction, and contact with the sewing needle is prevented, and further, the sewing needle is moved to the thread shifting position before the sewing needle is raised from the bottom dead center. By returning, the sewing thread passed through the needle hole of the sewing needle is clamped .
請求項1に記載の発明によれば、駆動機構は、糸寄せ部材を、下降する縫い針の先端が糸寄せ部材に到達する前に糸寄せ位置に移動して、その後縫い針の先端が糸寄せ部材の側方を通過する前に縫い針の上下動経路から隔離させる隔離位置に移動させ、さらに、縫い針が下死点から上昇する前に糸寄せ位置に復帰させる。   According to the first aspect of the present invention, the drive mechanism moves the thread gathering member to the thread gathering position before the tip of the descending sewing needle reaches the thread gathering member, and then the tip of the sewing needle moves to the thread gathering position. Before passing the side of the shifting member, it is moved to an isolation position where it is isolated from the vertical movement path of the sewing needle, and further returned to the thread shifting position before the sewing needle rises from the bottom dead center.
請求項1に記載の発明によれば、駆動機構は、糸寄せ部材を下降する縫い針の先端が糸寄せ部材に到達する前に糸寄せ位置に移動して、その後縫い針の先端が糸寄せ部材の側方を通過する前に縫い針の上下動経路から隔離させる隔離位置に移動させ、さらに、縫い針が下死点から上昇する前に糸寄せ位置に復帰させる。
よって、駆動機構は、縫い針の下降時においては、縫い針の先端が糸寄せ部材の側方を通過する際に、縫い針の先端と糸寄せ部材との間には隙間が形成されることとなり、縫い糸の張力によって縫い針の先端が曲げられた状態で下降してもその先端はその隙間を通って布地を突き刺すこととなるので、縫い針の糸寄せ部材への接触を防止することができる。また、駆動機構は、縫い針の上昇時においては、縫い針の針穴に通された縫い糸の一部は縫い針と糸寄せ部材とに挟まれ、縫い針が上昇してもともに上昇することがなく、針穴付近の縫い糸が弛んだ状態となる。よって、縫い糸のループを形成しやすくなるので、目飛びによる縫い不良が減少し、作業性を大幅に向上させることができ、更には、製品の品質を向上させることができる。
According to the first aspect of the present invention, the drive mechanism moves to the thread gathering position before the tip of the sewing needle that descends the thread gathering member reaches the thread gathering member, and then the tip of the sewing needle moves to the yarn gathering. Before passing the side of the member, the sewing needle is moved to an isolation position to be isolated from the vertical movement path of the sewing needle, and further returned to the thread shifting position before the sewing needle is lifted from the bottom dead center.
Therefore, when the sewing needle is lowered, the drive mechanism forms a gap between the tip of the sewing needle and the thread pulling member when the tip of the sewing needle passes the side of the thread pulling member. Therefore, even if the tip of the sewing needle descends in a bent state due to the tension of the sewing thread, the tip will pierce the fabric through the gap, so that it is possible to prevent the sewing needle from coming into contact with the thread gathering member. it can. In addition, when the sewing needle is raised, the drive mechanism is such that a part of the sewing thread passed through the needle hole of the sewing needle is sandwiched between the sewing needle and the thread pulling member, and the sewing needle rises even when the sewing needle is raised. The sewing thread near the needle hole is loosened. Therefore, since it becomes easy to form a loop of the sewing thread, it is possible to reduce sewing defects due to stitch skipping, greatly improve workability, and further improve product quality.
以下、図面を参照して、本発明であるミシンの最良の形態について詳細に説明する。なお、本形態においては、ミシンの一例として単糸環縫いを行うボタン付けミシンを例に挙げて説明する。
<ミシンの構成>
図1〜図4に示すように、ボタン付けミシン(以下ミシンという。)100は、上下に往復動する縫い針1と、縫い針1が下死点から上昇する際に縫い糸t1,t2のループを拾い取るルーパ2と、縫い針1が下降する際にルーパ2と布地の間に掛け渡された2本の縫い糸t1,t2の途中部分を寄せ集めて縫い針1の上下動経路から退避させる糸寄せ部32と、縫い針1が上昇する際に縫い針1との間に2本の縫い糸t1,t2の一方を挟み込む挟持部34とを有し、待機位置から、所定の移動経路を経て糸寄せ部32による糸の寄せ集めと挟持部34による糸の挟み込みが行われる糸寄せ位置に移動する糸寄せ部材3と、糸寄せ部材3を所定の移動経路に沿って移動させる駆動機構4等を備えている。
Hereinafter, the best mode of a sewing machine according to the present invention will be described in detail with reference to the drawings. In this embodiment, as an example of the sewing machine, a button sewing machine that performs single-thread ring stitching will be described as an example.
<Configuration of sewing machine>
As shown in FIGS. 1 to 4, a button sewing machine (hereinafter referred to as a sewing machine) 100 includes a sewing needle 1 that reciprocates up and down, and a loop of sewing threads t1 and t2 when the sewing needle 1 rises from the bottom dead center. The looper 2 that picks up the sewing needle and the middle portions of the two sewing threads t1 and t2 that are stretched between the looper 2 and the fabric when the sewing needle 1 descends are gathered together and retracted from the vertical movement path of the sewing needle 1. It has a thread gathering part 32 and a clamping part 34 that sandwiches one of the two sewing threads t1, t2 between the sewing needle 1 when the sewing needle 1 is raised, and passes a predetermined movement path from the standby position. A yarn gathering member 3 that moves to a yarn gathering position where yarn gathering by the yarn gathering portion 32 and yarn clamping by the pinching portion 34 are performed, a drive mechanism 4 that moves the yarn gathering member 3 along a predetermined movement path, and the like It has.
図1に示すように、縫い針1の先端には、針穴11が形成されており、この針穴11に縫い糸t1,t2を通すようになっている。
ルーパ2は、先端部が爪状に形成された第1糸掛け部2aと、外周面が曲面状に形成された第2糸掛け部2bと、軸部2cとを備えており、ミシンベッドの内部で、ルーパ軸の前端部に軸部2cを介して取り付けられ、ミシン100の作動時にルーパ軸の回転によって、反時計方向に回転運動し、縫い針1とともに作動して縫い目を形成するものである。
As shown in FIG. 1, a needle hole 11 is formed at the tip of the sewing needle 1, and the sewing threads t <b> 1 and t <b> 2 are passed through the needle hole 11.
The looper 2 includes a first thread hook 2a having a claw-shaped tip, a second thread hook 2b having a curved outer peripheral surface, and a shaft portion 2c. Internally, it is attached to the front end of the looper shaft via the shaft portion 2c, and when the sewing machine 100 is operated, it rotates in the counterclockwise direction by the rotation of the looper shaft and operates together with the sewing needle 1 to form a seam. is there.
糸寄せ部材3は、ミシン100の針板(図示略)とルーパ2との間に介装されて、A−B方向への左進・右退運動を行うもので、縫い針1の下降時には、一旦D方向へ進んだ後、A方向へ進んで、先端部が布地とルーパ2との間に掛け渡しされた2本の縫い糸(ループ部)の途中部分を引っ掛けて縫い針1の下降位置の側方に寄せるように作用し、また、縫い針1の上昇時には、B方向とC方向の中間の斜め方向に退くように構成されている。また、図2に示すように、糸寄せ部材3の基端部には、幅方向、すなわち、A−B方向に長い長円状のガイド孔31が形成されている。   The thread shifting member 3 is interposed between a needle plate (not shown) of the sewing machine 100 and the looper 2 and performs a leftward / rightward movement in the direction AB, and when the sewing needle 1 is lowered. , Once in the D direction, proceed in the A direction, and the lower end of the sewing needle 1 by hooking the middle part of the two sewing threads (loop part) with the tip part stretched between the fabric and the looper 2 Further, the sewing needle 1 is configured to retreat in an oblique direction between the B direction and the C direction when the sewing needle 1 is raised. Further, as shown in FIG. 2, an oval guide hole 31 that is long in the width direction, that is, the AB direction is formed in the proximal end portion of the yarn moving member 3.
また、糸寄せ部材3は、布地とルーパ2との間に掛け渡しされた2本の縫い糸(ループ部)t1,t2の途中部分を引っ掛けて縫い針1の下降位置の側方に寄せるように作用するが、2本の縫い糸t1,t2の途中部分を引っ掛けて寄せ集めた際に、糸寄せ部材3より上方に位置する2本の縫い糸t1,t2を、上下に密接させるように構成されている。すなわち、糸寄せ部材3の先端部には、縫い糸t1,t2を寄せ集める方向にくぼみが形成された糸寄せ部32が形成されている。
また、糸寄せ部材3は、縫い針1が下降する際に縫い針1の下降をガイドするとともに、縫い針1の上昇の際に糸のループが確実に形成されるように縫い針1との間に縫い糸t1を挟み込む挟持部34を備えている。
また、糸寄せ部材3の両側端面および下面は、ガイド板7によって支持されている。このガイド板7は、糸寄せ部材3の長手方向、すなわち、C−D方向には固定であり、A−B方向には移動可能となっている。また、糸寄せ部材3はガイド板7にA−B方向に摺動自在に取り付けられている。
さらに、図2〜図4に示すように、糸寄せ部材3の下方には、回転軸22がC−D方向と平行にかつ軸回りに回転自在に配設されており、この回転軸22は図示しない駆動源によって縫い針1の上下動と連動して回転するようになっている。また、図4に示すように、回転軸22の先端部には、三角カム9が偏心状態で取り付けられている。したがって、回転軸22によって三角カム9が回転すると、ガイド板7がA−B方向に移動するようになっている。
Further, the thread shifting member 3 hooks the middle portions of the two sewing threads (loop portions) t1 and t2 stretched between the fabric and the looper 2 so as to be moved to the side where the sewing needle 1 is lowered. However, the two sewing threads t1 and t2 located above the thread shifting member 3 are arranged so as to closely contact each other when the middle portions of the two sewing threads t1 and t2 are hooked and gathered. Yes. In other words, the yarn gathering member 32 is formed with a yarn gathering portion 32 in which a depression is formed in the direction in which the sewing threads t1 and t2 are gathered.
Further, the thread shifting member 3 guides the lowering of the sewing needle 1 when the sewing needle 1 is lowered, and the thread shifting member 3 is connected to the sewing needle 1 so that a thread loop is reliably formed when the sewing needle 1 is raised. A clamping part 34 for clamping the sewing thread t1 therebetween is provided.
Further, both side end surfaces and the lower surface of the yarn moving member 3 are supported by the guide plate 7. The guide plate 7 is fixed in the longitudinal direction of the yarn moving member 3, that is, the CD direction, and is movable in the AB direction. Further, the yarn shifting member 3 is attached to the guide plate 7 so as to be slidable in the AB direction.
Further, as shown in FIGS. 2 to 4, a rotary shaft 22 is disposed below the yarn shifting member 3 so as to be parallel to the CD direction and rotatable about the axis. The sewing needle 1 is rotated in conjunction with the vertical movement of the sewing needle 1 by a drive source (not shown). Further, as shown in FIG. 4, the triangular cam 9 is attached to the distal end portion of the rotating shaft 22 in an eccentric state. Therefore, when the triangular cam 9 is rotated by the rotary shaft 22, the guide plate 7 is moved in the AB direction.
図3及び図4に示すように、駆動機構4は、糸寄せ部材3の基端部に形成されたガイド孔31と、回転軸22に軸支されて回転する回転部材5と、ガイド孔31と回転部材5とに係合するピン部材6等を備えている。
回転部材5は、円柱状に形成され、回転方向に沿った外周面には波状の溝部51が形成されている。溝部51の一部には、糸寄せ部材3の基端部先端側に僅かに膨らんだ湾曲部52が形成されている。詳細は後述するが、この湾曲部52によって縫い針1の下降時に糸寄せ部材3が縫い針1の上下動経路から隔離するように移動する。
ピン部材6は、ミシン本体に一端部が回動自在に固定された板材8の他端部に、板材8の上下面からそれぞれ板材8の上下面に対して垂直に突出するように設けられている。板材8の下面側のピン部材6は、回転部材5の溝部51に係合されており、板材8の上面側のピン部材6は、糸寄せ部材3のガイド孔31に係合されており、ガイド孔31内を自由に移動できるようになっている。
As shown in FIGS. 3 and 4, the drive mechanism 4 includes a guide hole 31 formed at the proximal end portion of the yarn moving member 3, a rotating member 5 that rotates while being supported by the rotating shaft 22, and a guide hole 31. And a pin member 6 that engages with the rotating member 5.
The rotating member 5 is formed in a cylindrical shape, and a wave-like groove 51 is formed on the outer peripheral surface along the rotation direction. A curved portion 52 that slightly swells on the distal end side of the proximal end portion of the yarn moving member 3 is formed in a part of the groove portion 51. Although details will be described later, the curved portion 52 moves the thread pulling member 3 so as to be isolated from the vertical movement path of the sewing needle 1 when the sewing needle 1 is lowered.
The pin member 6 is provided on the other end portion of the plate member 8 whose one end portion is rotatably fixed to the sewing machine body so as to protrude perpendicularly from the upper and lower surfaces of the plate member 8 to the upper and lower surfaces of the plate member 8, respectively. Yes. The pin member 6 on the lower surface side of the plate material 8 is engaged with the groove portion 51 of the rotating member 5, and the pin member 6 on the upper surface side of the plate material 8 is engaged with the guide hole 31 of the yarn shifting member 3, The guide hole 31 can be freely moved.
<単糸環縫いの方法>
ここで、図5を用いて、単糸環縫いによって布地にボタンを縫い付ける方法について説明する。まず、ボタンの一方の穴に入っていた縫い針1が、その下死点位置よりわずかに上昇運動を始めたときに、縫い針1の先端部の裏側に縫い糸t1,t2のループ部が作られ、このループ部にルーパ2の第1糸掛け部2aの先端が進入する。このとき、第1糸掛け部2aと第2糸掛け部2bとの間に前工程での縫い糸t1,t2のループ部を掛けた状態となっており、また、糸寄せ部材3は、前工程のループ部を寄せるように左進している。
<Single thread chain stitch method>
Here, a method of sewing buttons on the fabric by single-thread ring stitching will be described with reference to FIG. First, when the sewing needle 1 in one hole of the button starts to move slightly upward from its bottom dead center position, a loop portion of the sewing threads t1, t2 is formed on the back side of the tip of the sewing needle 1. The tip of the first yarn hooking portion 2a of the looper 2 enters the loop portion. At this time, the loop portion of the sewing threads t1 and t2 in the previous step is hung between the first yarn hooking portion 2a and the second yarn hooking portion 2b. It is going to the left to bring the loop part.
次いで、縫い針1がボタンの一方の穴から上昇していくときに、ルーパ2は第1糸掛け部2aで縫い糸t1,t2のループ部を広げながら前工程でのループ部を第1糸掛け部2aの後側から外していく。このとき、糸寄せ部材3は縫い針1の上昇に伴って右退していく。   Next, when the sewing needle 1 rises from one hole of the button, the looper 2 widens the loop portions of the sewing threads t1, t2 with the first thread hook portion 2a, and the loop portion in the previous step is hooked with the first thread hook. Remove from the rear side of the part 2a. At this time, the thread pulling member 3 is retracted to the right as the sewing needle 1 is raised.
続いて、縫い針1が上死点位置から下降するときに、ボタンと布地Cが、ミシン内部に備えられている送り機構によって送られて、ボタンの他方の穴が縫い針1の直下部に位置することになる。このとき、ルーパ2は反時計方向に回転して縫い糸t1,t2のループ部を第1糸掛け部2aから第2糸掛け部2b側へ移動させる。このとき、先に外した前工程のループ部は上方に引き上げられて締められていく。また、これと同時に、糸寄せ部材3は、ループ部の途中部分を引っ掛けて縫い針1の下降に支障とならない位置に寄せるように左進する。   Subsequently, when the sewing needle 1 descends from the top dead center position, the button and the fabric C are fed by the feed mechanism provided inside the sewing machine, and the other hole of the button is placed directly below the sewing needle 1. Will be located. At this time, the looper 2 rotates counterclockwise to move the loop portions of the sewing threads t1, t2 from the first thread hook 2a to the second thread hook 2b. At this time, the previously removed loop portion of the previous process is pulled upward and tightened. At the same time, the yarn gathering member 3 moves leftward so as to catch the middle portion of the loop portion and bring it to a position that does not hinder the lowering of the sewing needle 1.
次に、縫い針1が下降してボタンの他方の穴に進入するにしたがって、前工程での縫い糸t1,t2のループが締められて結び目(縫い目)が形成される。また、これと同時に、縫い糸t1,t2のループ部が、ルーパ2の第1糸掛け部2aから第2糸掛け部2b側へ移動していき、布地Cの下面から糸寄せ部材3にかけて斜めに張られた状態となっている。次いで、ボタンの他方の穴に入っていた縫い針1が、その下死点よりわずかに上昇運動を始めたときに、縫い針1の先端部の裏側に新たに次のループ部が形成され、これ以降は、上記と同様にして縫い付けを行う。   Next, as the sewing needle 1 descends and enters the other hole of the button, the loop of the sewing threads t1 and t2 in the previous process is tightened to form a knot (seam). At the same time, the loop portions of the sewing threads t1 and t2 move from the first yarn hooking portion 2a of the looper 2 to the second yarn hooking portion 2b side, and obliquely from the lower surface of the fabric C to the yarn shifting member 3. It is in a stretched state. Next, when the sewing needle 1 that has entered the other hole of the button begins to move upward slightly from its bottom dead center, a new loop portion is newly formed on the back side of the tip of the sewing needle 1, Thereafter, sewing is performed in the same manner as described above.
<糸寄せ部材の動作>
次に、駆動機構4による糸寄せ部材3の動作について、図6及び図7に基づいて説明する。図6は、回転部材5の溝部51と三角カム9の外周面との形状に基づいて合成される糸寄せ部材3の糸寄せ部32の移動軌跡を模式的に表した図である。また、図7は、図6における糸寄せ部材3の糸寄せ部32の移動軌跡に対応する縫い針1の先端の糸寄せ部材3からの高さ位置を模式的に表した図である。なお、図6においては、理解を容易にするために、P5とP2(P4)の位置における糸寄せ部材3の位置を一点鎖線で示している。また、縫い針1は、図6に示すように、P6の位置を上下動するようになっている。
<Operation of the thread-feeding member>
Next, the operation of the yarn gathering member 3 by the drive mechanism 4 will be described with reference to FIGS. FIG. 6 is a diagram schematically showing the movement locus of the yarn gathering portion 32 of the yarn gathering member 3 synthesized based on the shapes of the groove portion 51 of the rotating member 5 and the outer peripheral surface of the triangular cam 9. FIG. 7 is a diagram schematically showing the height position of the tip of the sewing needle 1 from the yarn gathering member 3 corresponding to the movement locus of the yarn gathering portion 32 of the yarn gathering member 3 in FIG. In FIG. 6, for easy understanding, the position of the yarn shifting member 3 at the positions P5 and P2 (P4) is indicated by a one-dot chain line. Further, the sewing needle 1 moves up and down at the position of P6 as shown in FIG.
まず、縫い針1が上死点に位置するとき、糸寄せ部材3の糸寄せ部32は図6のP5に位置し、縫い針1は図7のP5の上死点に位置している。上死点から縫い針1の下降に伴って回転軸22が回転すると、板材8の下面側のピン部材6が溝部51に係合してD方向に移動し、これによって板材8の上面側のピン部材6がガイド孔31を摺動しながら糸寄せ部材3をD方向に移動させ、糸寄せ部材3の糸寄せ部32をP1に移動させる。P1の位置は、その後、糸寄せ部材3がA方向に移動するとき糸寄せ部材3の先端33が縫い針1の上下動経路を横切ることが可能な位置である。この糸寄せ部32のP5からP1への移動において、三角カム9は、その外周面から回転軸22の軸心までの距離が一定となるように形成されており、糸寄せ部32のP5からP1への移動の際には、三角カム9によるA−B方向への移動は行われない。   First, when the sewing needle 1 is located at the top dead center, the yarn gathering portion 32 of the yarn gathering member 3 is located at P5 in FIG. 6, and the sewing needle 1 is located at the top dead center at P5 in FIG. When the rotary shaft 22 rotates with the lowering of the sewing needle 1 from the top dead center, the pin member 6 on the lower surface side of the plate material 8 engages with the groove portion 51 and moves in the D direction. While the pin member 6 slides on the guide hole 31, the yarn gathering member 3 is moved in the direction D, and the yarn gathering portion 32 of the yarn gathering member 3 is moved to P1. The position of P1 is a position where the tip 33 of the thread gathering member 3 can cross the vertical movement path of the sewing needle 1 when the yarn gathering member 3 moves in the A direction thereafter. In the movement of the yarn gathering portion 32 from P5 to P1, the triangular cam 9 is formed so that the distance from the outer peripheral surface to the axis of the rotary shaft 22 is constant. During the movement to P1, the movement in the AB direction by the triangular cam 9 is not performed.
さらに、縫い針1の下降に伴って回転軸22が回転すると、三角カム9の偏心によりガイド部材7がA方向に移動し、この移動により糸寄せ部材3がA方向に移動する。そして、糸寄せ部材3の先端33は、この移動の際にP6で示される縫い針1の下を横切って、布地とルーパ2との間に掛け渡された2本の縫い糸t1,t2を引っ掛けて寄せ集める。さらに、糸寄せ部材3のA方向への移動は、糸寄せ部32がP2(糸寄せ位置)に到るまで継続される。このP1からP2に到る糸寄せ部32の移動によって布地とルーパ2との間に掛け渡された2本の縫い糸t1,t2は、途中部分が糸寄せ部32に寄せ集められ、P2の位置に移動される。この糸寄せ部32のP1からP2への移動によって、縫い針1の上下動経路から退避されて、これらの縫い糸t1,t2の間に縫い針1が侵入することが防止され、ボタンを縫い不良なく確実に布地に縫いつけることができる。
この糸寄せ部32のP1からP2への移動は、回転部材5の溝部51による板材8のC−D方向への移動は行われず、三角カム9の回転によってのみが行われる。
Further, when the rotary shaft 22 rotates as the sewing needle 1 descends, the guide member 7 moves in the A direction due to the eccentricity of the triangular cam 9, and this movement causes the yarn feeder 3 to move in the A direction. Then, the tip 33 of the thread shifting member 3 crosses under the sewing needle 1 indicated by P6 during this movement, and hooks two sewing threads t1 and t2 that are stretched between the fabric and the looper 2. Gather together. Further, the movement of the yarn gathering member 3 in the A direction is continued until the yarn gathering portion 32 reaches P2 (yarn gathering position). The two sewing threads t1 and t2 spanned between the fabric and the looper 2 by the movement of the yarn gathering portion 32 from P1 to P2 are gathered together in the middle of the yarn gathering portion 32, and the position of P2 Moved to. By the movement of the thread gathering portion 32 from P1 to P2, the sewing needle 1 is withdrawn from the vertical movement path of the sewing needle 1, and the sewing needle 1 is prevented from entering between the sewing threads t1 and t2. And can be sewn to the fabric reliably.
The movement of the yarn feeder 32 from P1 to P2 is not performed by the groove 51 of the rotating member 5 in the CD direction of the plate member 8 but is performed only by the rotation of the triangular cam 9.
なお、糸寄せ部32がP2に位置した瞬間には、図7に示すように、縫い針1は未だ下降途中の位置にあり、縫い針1の先端は糸寄せ部材3の上方位置(例えば、約1cmの上方位置)にある。その後、縫い針1は、さらに下降して糸寄せ部材3の上面と略面一となる位置(図7に示すP3の位置)に移動する。縫い針1がP2の位置からP3の位置に下降する間に糸寄せ部材3はC方向に後退する。   At the moment when the thread gathering portion 32 is positioned at P2, as shown in FIG. 7, the sewing needle 1 is still in the position of lowering, and the tip of the sewing needle 1 is positioned above the thread gathering member 3 (for example, About 1 cm above). Thereafter, the sewing needle 1 further descends and moves to a position (position P3 shown in FIG. 7) that is substantially flush with the upper surface of the thread pulling member 3. While the sewing needle 1 is lowered from the position P2 to the position P3, the thread pulling member 3 moves backward in the C direction.
ここで、本発明の特徴部分である糸寄せ部32がP2からP3、P3(隔離位置)からP4(糸寄せ位置)の軌跡を描くときの糸寄せ部材3の動作を説明する。
図8に示すように、ミシン100に備えられた駆動機構により、縫い針1を上述した下降途中の位置からさらに下降させていくと、回転軸22も回転し、縫い針1の先端が糸寄せ部材3の側方を通過する際(図7に示すP3の位置)、すなわち、先端と糸寄せ部材3の上面が略面一となる直前に板材8の下面側のピン部材6が回転部材5の湾曲部52を通過して、糸寄せ部材3がC方向に後退を開始して、縫い針1が糸寄せ部材3の側方を通過する際には、縫い針1の移動経路と糸寄せ部材3の間隔が広がる。そして、糸寄せ部材3の糸寄せ部32がP3の位置に後退した直後に縫い針1は下死点(図7に示すP4の位置)に到達する。
Here, the operation of the yarn gathering member 3 when the yarn gathering portion 32 which is a characteristic part of the present invention draws a locus from P2 to P3 and from P3 (isolation position) to P4 (yarn gathering position) will be described.
As shown in FIG. 8, when the sewing needle 1 is further lowered from the above-mentioned lowering position by the drive mechanism provided in the sewing machine 100, the rotary shaft 22 also rotates, and the tip of the sewing needle 1 is threaded. When passing through the side of the member 3 (position P3 shown in FIG. 7), that is, immediately before the tip and the upper surface of the yarn pulling member 3 are substantially flush, the pin member 6 on the lower surface side of the plate 8 is rotated by the rotating member 5. When the sewing needle 1 passes by the side of the thread gathering member 3 and the thread gathering member 3 starts to move backward in the direction C, the movement path of the sewing needle 1 and the thread gathering are started. The interval between the members 3 increases. The sewing needle 1 reaches the bottom dead center (position P4 shown in FIG. 7) immediately after the thread gathering portion 32 of the thread gathering member 3 is retracted to the position P3.
その後、図7及び図8に示すように、縫い針1が糸寄せ部材3の側方から下死点に到達する間に、板材8の下面側のピン部材6は、回転軸22の回転により回転部材5の湾曲部52の頂点52a付近を通過してD方向に移動して湾曲部52を通過し終わる。従って、板材8の上面側のピン部材6は、糸寄せ部材3をD方向に前進させ、縫い針1が下死点から上昇する前に、糸寄せ部32を再びP2(P4)の糸寄せ位置に復帰させ、縫い針1と糸寄せ部材3の挟持部34とで縫い糸を挟み込むように糸寄せ部材3を近接させる。そして、この移動により、糸寄せ部32は、再びP2(P4)の位置に到達する。このように縫い針1と糸寄せ部材3の挟持部34とを接近させ、縫い針1と挟持部34とで糸を挟み込むようにすることで、縫い針1の下降をガイドすることができるとともに、縫い針1の上昇の際に糸のループが確実に形成されるようにすることができる。   Thereafter, as shown in FIGS. 7 and 8, while the sewing needle 1 reaches the bottom dead center from the side of the thread pulling member 3, the pin member 6 on the lower surface side of the plate member 8 is rotated by the rotation of the rotary shaft 22. It passes through the vicinity of the apex 52 a of the bending portion 52 of the rotating member 5, moves in the D direction, and finishes passing through the bending portion 52. Accordingly, the pin member 6 on the upper surface side of the plate member 8 advances the yarn gathering member 3 in the D direction, and before the sewing needle 1 is lifted from the bottom dead center, the yarn gathering portion 32 is again moved to the yarn gathering of P2 (P4). Returning to the position, the thread gathering member 3 is brought close to the sewing needle 1 and the clamping part 34 of the thread gathering member 3 so as to sandwich the sewing thread. As a result of this movement, the yarn moving portion 32 reaches the position P2 (P4) again. In this way, the sewing needle 1 and the pinching portion 34 of the thread pulling member 3 are brought close to each other so that the thread is pinched by the sewing needle 1 and the pinching portion 34, so that the lowering of the sewing needle 1 can be guided. When the sewing needle 1 is raised, a thread loop can be surely formed.
なお、糸寄せ部32がP2からP4に到る糸寄せ部材3のC−D方向の移動中は、三角カム9によるA−B方向への移動は行われず、糸寄せ部材3の移動は、回転部材5の回転によってのみ行われる。   During the movement in the CD direction of the yarn gathering member 3 from P2 to P4, the yarn gathering portion 32 is not moved in the AB direction by the triangular cam 9, and the movement of the yarn gathering member 3 is This is performed only by the rotation of the rotating member 5.
また、糸寄せ部材3は、糸寄せ部32がP2(P4)とする位置へ到着後、縫い針1の上昇に伴う回転軸22の回転により、B方向とC方向とに移動し、縫い針1が上死点に到達する際に再び糸寄せ部32がP5とする位置に到着する。この糸寄せ部32のP2(P4)からP5への移動は、三角カム9によるB方向への移動と回転部材5の溝部51によるC方向への移動とが合成されて行われる。   Further, after the yarn gathering member 3 arrives at the position where the yarn gathering portion 32 is set to P2 (P4), it is moved in the B direction and the C direction by the rotation of the rotary shaft 22 as the sewing needle 1 is raised, and the sewing needle When 1 reaches the top dead center, the yarn gathering portion 32 arrives again at the position set to P5. The movement of the yarn feeder 32 from P2 (P4) to P5 is performed by combining the movement in the B direction by the triangular cam 9 and the movement in the C direction by the groove 51 of the rotating member 5.
本発明に係るミシン100によれば、縫い針1の下降時に、回転部材5が回転することにより、板材8の下面側のピン部材6は、波状の溝部51に案内されて糸寄せ部材3の長手方向に上下動する。ここで、溝部51には、縫い針1の下降時において回転部材5の回転時に板材8の下面側のピン部材6を糸寄せ部材3の基端部先端側に移動させる湾曲部52が形成されているので、回転部材5の回転中に板材8の下面側のピン部材6は湾曲部52を通過することとなる。そして、板材8の下面側のピン部材6が湾曲部52を通過すると、板材8の上面側のピン部材6は糸寄せ部材3の長手方向に沿って後退し、糸寄せ部材3のガイド孔31に係合された板材8の上面側のピン部材6が糸寄せ部材3をその長手方向に後退させることになる。一方、湾曲部52の頂点52aを板材8の下面側のピン部材6が通過し終わると、板材8の上面側のピン部材6は糸寄せ部材3の長手方向に沿って前進し、糸寄せ部材3のガイド孔31に係合された板材8の上面側のピン部材6が糸寄せ部材3をその長手方向に前進させることになる。   According to the sewing machine 100 according to the present invention, when the sewing needle 1 is lowered, the rotating member 5 rotates, so that the pin member 6 on the lower surface side of the plate material 8 is guided by the wave-like groove 51 and the thread-feeding member 3 is rotated. Moves up and down in the longitudinal direction. Here, the groove portion 51 is formed with a curved portion 52 that moves the pin member 6 on the lower surface side of the plate 8 toward the distal end side of the base end portion of the yarn gathering member 3 when the rotary member 5 rotates when the sewing needle 1 is lowered. Therefore, the pin member 6 on the lower surface side of the plate member 8 passes through the curved portion 52 during the rotation of the rotating member 5. When the pin member 6 on the lower surface side of the plate material 8 passes through the curved portion 52, the pin member 6 on the upper surface side of the plate material 8 moves backward along the longitudinal direction of the yarn gathering member 3 and guide holes 31 of the yarn gathering member 3. The pin member 6 on the upper surface side of the plate member 8 engaged with the threading member retracts the yarn gathering member 3 in the longitudinal direction. On the other hand, when the pin member 6 on the lower surface side of the plate material 8 has passed through the apex 52a of the curved portion 52, the pin member 6 on the upper surface side of the plate material 8 moves forward along the longitudinal direction of the yarn shifting member 3, The pin member 6 on the upper surface side of the plate member 8 engaged with the three guide holes 31 advances the yarn moving member 3 in the longitudinal direction.
よって、駆動機構4は、縫い針1の下降時においては、縫い針1の先端が糸寄せ部材3の側方を通過する前に糸寄せ部材3を縫い針1の上下動経路から離隔させる。これにより、縫い針1の先端と糸寄せ部材3との間には隙間が形成され、縫い糸の張力によって先端が曲げられた状態で下降しても先端はその隙間を通って布地を突き刺すこととなるので、縫い針1の糸寄せ部材3への接触を防止することができる。また、駆動機構4は、縫い針1の上昇時において、縫い針1と糸寄せ部材3の挟持部34とで縫い糸の一部を挟み込むように糸寄せ部材3を縫い針1の上下動経路に近接させる。これにより、縫い針1の針穴に通された縫い糸の一部は縫い針1と糸寄せ部材3とに挟まれ、縫い針1が上昇しても共に上昇することがなく、針穴11付近の縫い糸が弛んだ状態となる。よって、縫い糸のループを形成しやすくなるので、目飛びによる縫い不良が減少し、作業性を大幅に向上させることができ、更には、製品の品質を向上させることができる。   Therefore, when the sewing needle 1 is lowered, the drive mechanism 4 separates the thread gathering member 3 from the vertical movement path of the sewing needle 1 before the tip of the sewing needle 1 passes the side of the yarn gathering member 3. As a result, a gap is formed between the tip of the sewing needle 1 and the thread pulling member 3, and the tip pierces the fabric through the gap even when the tip is lowered while the tip is bent by the tension of the sewing thread. As a result, the sewing needle 1 can be prevented from coming into contact with the thread gathering member 3. Further, when the sewing needle 1 is raised, the drive mechanism 4 moves the thread-feeding member 3 in the vertical movement path of the sewing needle 1 so that a part of the sewing thread is sandwiched between the sewing needle 1 and the clamping part 34 of the thread-feeding member 3. Close. As a result, a part of the sewing thread passed through the needle hole of the sewing needle 1 is sandwiched between the sewing needle 1 and the thread pulling member 3 and does not rise even when the sewing needle 1 is raised. The sewing thread becomes loose. Therefore, since it becomes easy to form a loop of the sewing thread, it is possible to reduce sewing defects due to stitch skipping, greatly improve workability, and further improve product quality.
また、駆動機構4は縫い針1の下降時に糸寄せ部材3をその長手方向に沿って後退させ、縫い針1の上昇時に糸寄せ部材3をその長手方向に沿って前進させる。すなわち、駆動機構4は糸寄せ部材3を前後方向に動かすように構成されていればよいので、その構造を簡単なものとすることができる。   Further, the drive mechanism 4 retracts the thread gathering member 3 along its longitudinal direction when the sewing needle 1 is lowered, and advances the thread gathering member 3 along its longitudinal direction when the sewing needle 1 is raised. That is, the drive mechanism 4 only needs to be configured to move the yarn gathering member 3 in the front-rear direction, so that the structure can be simplified.
なお、本発明は、上記実施の形態に限定されるものではない。例えば、駆動機構4を構成する回転部材5に代えて、ステッピングモータ等、他のアクチュエータを用いて糸寄せ部材3の後退あるいは前進を行ってもよい。その他、本発明は、発明の要旨を逸脱しない範囲内で自由に変更、改良が可能である。   The present invention is not limited to the above embodiment. For example, instead of the rotating member 5 constituting the drive mechanism 4, the yarn moving member 3 may be moved backward or forward using another actuator such as a stepping motor. In addition, the present invention can be freely changed and improved without departing from the gist of the invention.
本発明に係るミシンの要部を示す斜視図である。It is a perspective view which shows the principal part of the sewing machine which concerns on this invention. 図1に示すミシンの要部を示す平面図である。It is a top view which shows the principal part of the sewing machine shown in FIG. 図1において、回転部材を透視した図である。FIG. 2 is a perspective view of a rotating member in FIG. 1. 駆動機構を示す斜視図である。It is a perspective view which shows a drive mechanism. 縫製時における糸寄せ部材を説明する図であり、(a)は正面図、(b)は側面図である。It is a figure explaining the thread gathering member at the time of sewing, (a) is a front view, (b) is a side view. 糸寄せ部材の糸寄せ部の移動軌跡を示す平面図である。It is a top view which shows the movement locus | trajectory of the yarn gathering part of a yarn gathering member. 縫い針の移動軌跡を示す平面図である。It is a top view which shows the movement locus | trajectory of a sewing needle. 縫い針の下降時における、縫い針と糸寄せ部材の位置関係を示す図である。It is a figure which shows the positional relationship of a sewing needle and a thread gathering member at the time of lowering of a sewing needle. 縫い針の上昇時における、縫い針と糸寄せ部材の位置関係を示す図である。It is a figure which shows the positional relationship of a sewing needle and a thread gathering member at the time of a raise of a sewing needle. 従来技術におけるミシンの一例であり、(a)は平面図、(b)は正面図、(c)は側面図である。It is an example of the sewing machine in a prior art, (a) is a top view, (b) is a front view, (c) is a side view.
符号の説明Explanation of symbols
1 縫い針
2 ルーパ
3 糸寄せ部材
31 ガイド孔
32 糸寄せ部
34 挟持部
4 駆動機構
5 回転部材
51 溝部
52 湾曲部
6 ピン部材
100 ミシン
DESCRIPTION OF SYMBOLS 1 Sewing needle 2 Looper 3 Thread gathering member 31 Guide hole 32 Thread gathering part 34 Nipping part 4 Drive mechanism 5 Rotating member 51 Groove part 52 Curved part 6 Pin member 100 Sewing machine

Claims (1)

  1. 上下に往復動する縫い針と、
    前記縫い針が下死点から上昇する際に縫い糸のループを拾い取るルーパと、
    前記ルーパの上方に配置され、前記縫い針が下降する際に前記ルーパと布地の間に掛け渡された2本の縫い糸の途中部分を寄せ集めて前記縫い針の上下動経路から退避させる糸寄せ部と、前記縫い針が上昇する際に前記縫い針との間に縫い針の針穴に通された縫い糸の一方を挟み込む挟持部とを有し、待機位置から所定の移動経路を経て前記糸寄せ部による糸の寄せ集めと前記挟持部による糸の挟み込みが行われる糸寄せ位置に移動する糸寄せ部材と、
    前記糸寄せ部材を前記所定の移動経路に沿って移動させる駆動機構と、を備えたミシンであって、
    前記駆動機構は、前記糸寄せ部材を、下降する前記縫い針の先端が前記糸寄せ部材に到達する前に前記糸寄せ位置に移動させて、その後前記縫い針の先端が前記糸寄せ部材の側方を通過する前に前記縫い針の上下動経路から隔離させる隔離位置に移動させることにより縫い針との接触を防止し、さらに前記縫い針が下死点から上昇する前に前記糸寄せ位置に復帰させることにより縫い針の針穴に通された縫い糸を挟持させることを特徴とするミシン。
    A sewing needle that reciprocates up and down;
    A looper that picks up a loop of sewing thread when the sewing needle ascends from bottom dead center;
    Thread gathering arranged above the looper and gathering together the middle portions of the two sewing threads stretched between the looper and the fabric when the sewing needle descends and retracts from the vertical movement path of the sewing needle And a clamping part for sandwiching one of the sewing threads passed through the needle hole of the sewing needle between the sewing needle and the sewing needle when the sewing needle is raised, and passing through the predetermined movement path from the standby position. A yarn gathering member that moves to a yarn gathering position where yarn gathering by the gathering unit and yarn clamping by the clamping unit are performed;
    A sewing machine comprising: a drive mechanism that moves the yarn shifting member along the predetermined movement path;
    The drive mechanism moves the thread gathering member to the thread gathering position before the tip of the descending sewing needle reaches the thread gathering member, and then the tip of the sewing needle is moved to the side of the thread gathering member. Is moved to an isolation position that is isolated from the vertical movement path of the sewing needle before passing the direction, and contact with the sewing needle is prevented, and further, the sewing needle is moved to the thread shifting position before the sewing needle is raised from the bottom dead center. A sewing machine characterized by holding the sewing thread passed through the needle hole of the sewing needle by returning the sewing thread .
JP2003358158A 2003-10-17 2003-10-17 sewing machine Active JP4294435B2 (en)

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