JPH0556079U - Two-needle sewing machine needle thread feeder - Google Patents
Two-needle sewing machine needle thread feederInfo
- Publication number
- JPH0556079U JPH0556079U JP10785091U JP10785091U JPH0556079U JP H0556079 U JPH0556079 U JP H0556079U JP 10785091 U JP10785091 U JP 10785091U JP 10785091 U JP10785091 U JP 10785091U JP H0556079 U JPH0556079 U JP H0556079U
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- needle
- thread
- upper thread
- holding
- sewing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
(57)【要約】
【目的】 この考案は、2本針ミシンの片針停止期間に
あっても適量の上糸を供給することができる上糸供給装
置の提供を目的とする。
【構成】 この考案は、第1の挟持機構16と第2の挟
持機構17とで交互に上糸I1,I2を挟持させると共
に、第2の挟持機構による上糸挟持期間に上糸繰り出し
部材14を揺動させて上糸供給源側から上糸を繰り出す
ようにした上糸供給装置において、第1の上糸供給源B
1から第1の上糸挟持機構に至る上糸の保持、解放を行
う第1の保持機構20と、第2の上糸供給源B1から第
1の上糸挟持機構17に至る上糸の保持、解放を行う第
2の保持機構21と、片針停止レバー22に連動して前
記各保持機構による上糸保持、解放動作を選択的に実行
させる選択機構24とを備え、前記選択機構は、不作動
とすべき縫い針に連なる上糸を保持させ、作動させるべ
き縫い針に連なる糸を解放させるようにしたものであ
る。
(57) [Summary] [Object] An object of the present invention is to provide a needle thread supply device capable of supplying an appropriate amount of needle thread even during a single-needle stop period of a two-needle sewing machine. According to the present invention, the first pinching mechanism 16 and the second pinching mechanism 17 alternately pinch the upper threads I1 and I2, and the upper thread feeding member 14 is held during the upper thread pinching period by the second pinching mechanism. In a needle thread supply device in which the upper thread is fed from the upper thread supply source side by swinging the first thread, a first upper thread supply source B
First holding mechanism 20 for holding and releasing the upper thread from 1 to the first upper thread holding mechanism, and holding of the upper thread from the second upper thread supply source B1 to the first upper thread holding mechanism 17. , A second holding mechanism 21 for releasing, and a selection mechanism 24 that interlocks with the one-needle stop lever 22 to selectively execute the needle thread holding and releasing operations by each of the holding mechanisms. The needle thread connected to the sewing needle to be inactivated is held and the thread connected to the sewing needle to be operated is released.
Description
【0001】[0001]
この考案は、2本針ミシンの各縫い針に一針毎に必要とする上糸量を供給する ようにした上糸供給装置に関し、特に、片針停止機能を有する2本針ミシンに適 用される上糸供給装置に関するものである。 The present invention relates to a needle thread supply device adapted to supply the required amount of needle thread to each sewing needle of a two-needle sewing machine, and is particularly suitable for a two-needle sewing machine having a one-needle stopping function. The present invention relates to a needle thread feeder.
【0002】[0002]
本縫いミシン等では、ミシン主軸の回転を駆動源として、一針毎に消費される 上糸量を上糸供給源から強制的に繰り出して縫い針へ供給するようにした上糸供 給装置が提案されており、さらにこの上糸供給装置を2本針ミシンに適用する試 みが現在なされている。 In a lockstitch sewing machine and the like, an upper thread supply device that uses the rotation of the sewing machine spindle as a drive source to forcibly feed out the upper thread amount consumed for each stitch from the upper thread supply source and supply it to the sewing needle. It has been proposed, and a trial to apply the needle thread feeder to a two-needle sewing machine is now being made.
【0003】 図5ないし図10は縫い針N1,N2を有する2本針ミシンに用いられた上糸 供給装置を示す図である。 図において、1はミシンアームで、その前面部には、図6に示すように開口部 1aが形成されている。2はこのミシンアーム1の前面部に固定した糸調子台で ある。この糸調子台2の中央部には、前記ミシンアームの開口部1aと連通する 切欠部2a(図6参照)が形成されている。5 to 10 are views showing a needle thread supply device used in a two-needle sewing machine having sewing needles N1 and N2. In the figure, reference numeral 1 is a sewing machine arm, and an opening 1a is formed in the front surface thereof as shown in FIG. 2 is a thread tension stand fixed to the front surface of the sewing machine arm 1. A notch 2a (see FIG. 6) communicating with the opening 1a of the sewing machine arm is formed in the center of the thread tension stand 2.
【0004】 3は前記糸調子台2の前面に固定したガイド部材2bにより昇降可能に保持さ れた糸量調節体で、その中央部には、前記糸調子台2の切欠部2a及びミシンア ーム1の開口部1aと連通する矩形の長孔3aが形成されており、また、背面部 には、ラック4が固定されている。このラック4は、前記糸調子台2の切欠部2 a及びミシンアーム1の開口部1aに挿通されてミシンアーム1の内方に突出し ており、糸量調節軸5の先端下部に固定したピニオン6と噛合している。前記糸 量調節軸5はミシンアーム1内に水平な状態で回動自在に支持されており、この 軸5を回転させることによりピニオン6が回転し、ラック4と共に糸量調節体3 が上昇又は下降するようになっている。Reference numeral 3 denotes a thread amount adjusting body held up and down by a guide member 2b fixed to the front surface of the thread tension base 2, and a cutout portion 2a of the thread tension base 2 and a sewing machine arm are provided in a central portion thereof. A rectangular elongated hole 3a communicating with the opening 1a of the frame 1 is formed, and a rack 4 is fixed to the rear surface. The rack 4 is inserted into the notch 2 a of the thread tension stand 2 and the opening 1 a of the sewing machine arm 1 and projects inward of the sewing machine arm 1. The rack 4 is fixed to the lower end of the tip of the thread amount adjusting shaft 5. It meshes with 6. The thread amount adjusting shaft 5 is rotatably supported in the sewing machine arm 1 in a horizontal state. When the shaft 5 is rotated, the pinion 6 is rotated and the yarn amount adjusting body 3 is raised together with the rack 4. It is designed to descend.
【0005】 また、7,8は上下に対向して設けられた一対の上糸案内部材であり、それぞ れ前記糸量調節体3の長孔3aの両側部に固定されたガイド部材3b(図7参照 )に昇降可能に嵌合している。この上糸案内部材7及び8は、所定の間隔を介し て対向する一対の糸挿通部7a,7b及び8a,8bを有し、各挿通部には上糸 を挿通させる糸挿通孔7a1,7b1及び8a1,8b1がそれぞれ形成されて いる(図7参照)。そして、前記糸挿通孔7a1,7b1には、図外の第1の上 糸供給源から一方の縫い針N1に至る上糸I1が挿通され、糸挿通孔8a1,8 b1には図外の第2の上糸供給から他方の縫い針に至る上糸I2が挿通されるよ うになっている。なお、相対孔する糸挿通孔7a1と7b1及び8a1と8b1 はそれぞれ同一の水平直線上に位置している。Reference numerals 7 and 8 denote a pair of upper thread guide members which are vertically opposed to each other, and guide members 3b (fixed on both sides of the elongated hole 3a of the thread amount adjusting body 3 respectively). (See Fig. 7). The upper thread guide members 7 and 8 have a pair of thread insertion portions 7a, 7b and 8a, 8b which are opposed to each other with a predetermined gap, and the thread insertion holes 7a1, 7b1 through which the upper thread is inserted into each insertion portion. And 8a1 and 8b1 are formed (see FIG. 7). Then, the thread insertion holes 7a1 and 7b1 are inserted with the needle thread I1 from the first needle thread supply source (not shown) to the one sewing needle N1, and the thread insertion holes 8a1 and 8b1 are provided with a thread (not shown). The upper thread I2 from the upper thread supply 2 to the other sewing needle is inserted. In addition, the thread insertion holes 7a1 and 7b1 and 8a1 and 8b1 which are opposed to each other are located on the same horizontal straight line.
【0006】 9は前記上側の上糸案内部材7の上端部に螺合する上側調節ねじ、10は下側 の上糸案内部材8の下端部に螺合する下側調節ねじであり、上側調節ねじ9は糸 量調節体3の上端部に、下側調節ねじ10は糸量調節体3の下端部にそれぞれ回 動自在に支持され、これらを回転させることにより、各上糸案内部材7,8がそ れぞれ糸量調節体3に対して昇降するようになっている。Reference numeral 9 is an upper adjusting screw screwed into the upper end of the upper needle thread guide member 7, and 10 is a lower adjusting screw screwed into the lower end of the lower needle thread guide member 8. The screw 9 is rotatably supported on the upper end portion of the thread amount adjusting body 3, and the lower adjusting screw 10 is rotatably supported on the lower end portion of the thread amount adjusting body 3. By rotating these, the upper thread guide members 7, 8 are respectively moved up and down with respect to the thread amount adjusting body 3.
【0007】 また、14は縫い針の昇降動作に同期して昇降する上糸繰り出し部材である。 この上糸繰り出し部材14は、その一端部が図8に示すようにミシンアーム1内 に支点軸15によって回動自在に支持されると共に、その中間部がミシン上軸1 1と共に回転する偏心カム12の外周に嵌合する糸繰り出しロッド13に軸着さ れており、ミシン上軸11と共に偏心カム12が回転することにより、前記支点 軸15を中心に昇降するようになっている。この上糸繰り出し部材14の他端部 は、ミシンアームの開口部1a,糸調子台2の切欠部2a及び糸量調節体3の長 孔3aを通過して前面側へ突出している。また、この糸繰り出し部材14の他端 部は、二股形状をなしており、その上辺部14aは上側上糸案内部材7における 上糸挿通部7aと7bとの間に位置し、下辺部14bは下側上糸案内部材8の上 糸挿通部8aと8bとの間に位置している。Numeral 14 is an upper thread feeding member which moves up and down in synchronization with the vertical movement of the sewing needle. As shown in FIG. 8, one end of the needle thread feeding member 14 is rotatably supported in the sewing machine arm 1 by a fulcrum shaft 15, and the middle portion of the needle thread feeding member 14 rotates together with the sewing machine upper shaft 11. It is axially attached to a yarn feeding rod 13 fitted to the outer periphery of the sewing machine 12, and when the eccentric cam 12 rotates together with the upper shaft 11 of the sewing machine, it moves up and down around the fulcrum shaft 15. The other end of the upper thread feeding member 14 passes through the opening 1a of the sewing machine arm, the notch 2a of the thread tension stand 2 and the elongated hole 3a of the thread amount adjusting body 3 and projects to the front side. The other end of the yarn feeding member 14 has a bifurcated shape, the upper side portion 14a of which is located between the upper thread inserting portions 7a and 7b of the upper side upper thread guide member 7, and the lower side portion 14b is It is located between the upper thread insertion portions 8a and 8b of the lower needle thread guide member 8.
【0008】 なお、Kは前記糸量調節体3の前面及び側面を覆うカバーである。Incidentally, K is a cover for covering the front surface and the side surface of the thread amount adjusting body 3.
【0009】 また、前記糸調子台2には、前記糸量調節体3の両側方において上糸I1,I 2を選択的に挟持する第1,第2の挟持部材16,17が設けられている。これ ら第1,第2の挟持部材16,17はそれぞれ相対向する一対の挟持板16a, 16b及び17a,17bを有し、各挟持板は、それぞれ各別に設けられたほぼ 同一の構成を有する開閉駆動機構によって開閉するようになっている。Further, the thread tension base 2 is provided with first and second clamping members 16 and 17 for selectively clamping the upper threads I 1 and I 2 on both sides of the thread amount adjusting body 3. There is. These first and second holding members 16 and 17 have a pair of holding plates 16a, 16b and 17a, 17b facing each other, and each holding plate has substantially the same structure provided separately. It is designed to be opened and closed by an opening and closing drive mechanism.
【0010】 図9は第1の挟持部材16及びこれを駆動する開閉駆動機構を示す図である。 図示のように、各挟持板16a,16bは、前記糸調子台2に嵌着した筒状のボ ス116cに水平移動可能に支持された移動軸16dに挿通されている。この移 動軸16cは、ばね16eによって常時ミシンアーム1の内方へ向けて付勢され ている。すなわち、両挟持板16a,16bが閉状態となる方向へ付勢されてい る。FIG. 9 is a diagram showing the first holding member 16 and the opening / closing drive mechanism for driving the first holding member 16. As shown in the drawing, each of the holding plates 16a and 16b is inserted into a moving shaft 16d which is supported by a cylindrical boss 116c fitted to the thread tension stand 2 so as to be horizontally movable. The moving shaft 16c is constantly urged toward the inside of the sewing machine arm 1 by a spring 16e. That is, both the sandwiching plates 16a and 16b are urged in the direction of closing.
【0011】 また、開閉駆動機構は、前記ミシン上軸11に前記移動軸16dの一端部と対 向するよう固定した駆動カム16Aにより構成され、これがミシン上軸11と共 に回転することにより、その端面が所定のタイミングで移動軸16dを外方へ移 動させ、挟持板16b,16aを開状態とするようになっている。The opening / closing drive mechanism is composed of a drive cam 16A fixed to the upper shaft 11 of the sewing machine so as to face one end of the moving shaft 16d, and by rotating this together with the upper shaft 11 of the sewing machine, The end surface moves the moving shaft 16d outward at a predetermined timing to open the holding plates 16b and 16a.
【0012】 なお、ここでは特に図示しないが、他方の第2の挟持部材17においても同様 の構成を有しており、また、これを開閉させる開閉駆動機構も同様にミシン上軸 11に固定した駆動カムによって構成されている。但し、その駆動カムは前記駆 動カム16Aに対して180度位相をずらしたものとなっており、これにより挟 持板17a,17bの開閉動作は、前記挟持板16a,16bの開閉動作に反し て行われるようになっている。すなわち、挟持板16a,16bが閉状態にある 時には、挟持板17a,17bは開状態となっており、また、挟持板16a,1 6bが開状態にある時には、挟持板17a,17bは閉状態となる。このため、 上糸I1及びI2は、糸量調節体3の両側方で選択的に挟持される。Although not particularly shown here, the other second holding member 17 also has a similar configuration, and an opening / closing drive mechanism for opening and closing the second holding member 17 is also fixed to the sewing machine upper shaft 11. It is composed of a drive cam. However, the driving cam is 180 degrees out of phase with the driving cam 16A, so that the opening / closing operation of the holding plates 17a, 17b is contrary to the opening / closing operation of the holding plates 16a, 16b. It is supposed to be done. That is, when the sandwiching plates 16a and 16b are in the closed state, the sandwiching plates 17a and 17b are in the open state, and when the sandwiching plates 16a and 16b are in the open state, the sandwiching plates 17a and 17b are in the closed state. Becomes Therefore, the upper yarns I1 and I2 are selectively clamped on both sides of the yarn amount adjusting body 3.
【0013】 このように構成された上糸供給装置において、上糸供給源から繰り出される上 糸I1,I2は、上糸案内部材g1からg6に亘って図7に示すように掛け渡さ れている。すなわち、両上糸I1,I2は第1,第2の挟持部材16,17の各 挟持板16aと16bの間、及び17aと17bの間にそれぞれ挿入されており 、また、第1,第2の挟持部材16,17の間では、上糸I1が糸挿通孔7a1 ,7b1に挿通され、上糸I2が8a1,8b1に挿通されている。In the needle thread feeder configured as described above, the needle threads I1 and I2 fed from the needle thread supply source are hung over the needle thread guide members g1 to g6 as shown in FIG. .. That is, the upper yarns I1 and I2 are respectively inserted between the holding plates 16a and 16b of the first and second holding members 16 and 17 and between the holding plates 17a and 17b, respectively. The upper thread I1 is inserted into the thread insertion holes 7a1 and 7b1 and the upper thread I2 is inserted into 8a1 and 8b1 between the holding members 16 and 17.
【0014】 ここで、縫製動作を開始すると、ミシン上軸11の各回転動作に同期して、上 糸繰り出し部材14が上下に揺動すると共に、第1,第2の挟持部材16,17 が開閉駆動機構によって選択的に開閉する。そして、上糸繰り出し部材14の上 昇時には、上糸I1,I2は図10(イ)に示すように水平状態となっており、 この状態から上糸繰り出し部材14が下降すると、その上辺部14a及び下辺部 14bが図10(ロ)に示すように水平状態に保持された上糸I1、I2を下方 へ引き下げて屈曲させ、糸挿通孔7b1から7a1に至る上糸量及び8b1から 8a1に至る上糸量をそれぞれ増大させる。この上糸繰り出し部材14の下降動 作時には、第1の挟持部材16は閉、第2の挟持部材17は開となっているため 、上糸繰り出し部材14の下降動作による上糸の増大分は、全て上糸供給源側か ら繰り出されることとなる。Here, when the sewing operation is started, the upper thread feeding member 14 swings up and down in synchronization with each rotation operation of the sewing machine upper shaft 11, and the first and second holding members 16 and 17 move. The opening and closing drive mechanism selectively opens and closes. When the upper thread delivering member 14 is elevated, the upper threads I1 and I2 are in a horizontal state as shown in FIG. 10A, and when the upper thread delivering member 14 descends from this state, the upper side portion 14a thereof is And, the lower side portion 14b pulls down the upper yarns I1 and I2 held in a horizontal state as shown in FIG. Increase the upper thread amount respectively. During the lowering operation of the upper thread feeding member 14, the first holding member 16 is closed and the second holding member 17 is open. Therefore, the increase amount of the upper thread due to the lowering operation of the upper thread feeding member 14 is , All will be fed from the needle thread supply source side.
【0015】 そして、上糸繰り出し部材14の上昇時には、前記第1,第2の挟持部材16 ,17の開閉状態は逆転し、第1の挟持部材16が開、第2の挟持部材17が閉 となる。その結果、上糸繰り出し部材14にて繰り出された上糸I1,I2は縫 目形成動作等によって縫い針N1,N2側へと移動し、供給される。なお、上糸 繰り出し部材14による上糸繰り出し量は、調節ねじ9,10による上糸案内部 材7,8の上下位置を調節することによって、あるいは、糸量調節軸5の回転に よる糸量調節体3の上下位置を調節することによって適宜変更可能である。従っ て、上記先行技術によれば、予めこの繰り出し量を1針毎に消費される上糸量に 設定しておくことで、両縫い針N1,N2により形成される2本の縫目に適正な 糸締まりを与えることができる。When the needle thread feeding member 14 is raised, the open / closed states of the first and second holding members 16 and 17 are reversed, so that the first holding member 16 is opened and the second holding member 17 is closed. Becomes As a result, the upper threads I1 and I2 fed by the upper thread feeding member 14 are moved to and supplied to the sewing needles N1 and N2 by a stitch forming operation or the like. The amount of the upper thread delivered by the upper thread delivery member 14 is adjusted by adjusting the vertical position of the upper thread guide members 7, 8 by the adjusting screws 9, 10, or by the rotation of the thread adjustment shaft 5. It can be changed as appropriate by adjusting the vertical position of the adjusting body 3. Therefore, according to the above-mentioned prior art, by setting the feeding amount in advance to the amount of needle thread consumed for each stitch, it is possible to properly adjust the two stitches formed by the sewing needles N1 and N2. It can give a tight thread.
【0016】 ところで、現在用いられている2本針ミシンとしては、レバー操作等により、 2本の縫い針N1,N2のうち、一方の縫い針のみを針板上方で停止させ得るよ うにした所謂片針停止機能を備えたものが知られている。 この片針停止機能は、例えば、図11に示すような屈曲した縫目を形成する場 合に用いられる。すなわち、この縫目S1,S2を形成する場合には、まず、2 本の縫い針N1,N2を用いて平行な縫目S1a,S2aを形成し、内側の縫目 S2の屈曲点P2に達した時点で、一方の縫い針N2を上死点にて停止させ、他 方の縫い針N1のみによって縫目S1の屈曲点P1まで縫製動作を行う。そして 、縫目S1が屈曲点P1に達した時点で一旦縫製動作を停止させ、布Wを回転さ せて再び一方の縫い針N1のみで縫製動作を行い、その縫目S1bが屈曲点P2 と揃った時点で、停止させていた縫い針N2を作動させ、2本の平行な縫目S1 b,S2bを形成する。By the way, a two-needle sewing machine currently used is a so-called so-called sewing machine in which only one of the two sewing needles N1 and N2 can be stopped above the needle plate by operating a lever or the like. A device having a one-needle stopping function is known. This one-needle stopping function is used, for example, when forming a bent seam as shown in FIG. That is, when forming the stitches S1 and S2, first, two stitches N1 and N2 are used to form parallel stitches S1a and S2a, and the bending point P2 of the inner stitch S2 is reached. At that time, one sewing needle N2 is stopped at the top dead center, and only the other sewing needle N1 performs the sewing operation up to the bending point P1 of the stitch S1. Then, when the stitch S1 reaches the bending point P1, the sewing operation is temporarily stopped, the cloth W is rotated, and the sewing operation is performed again with only one sewing needle N1, and the stitch S1b becomes the bending point P2. When they are aligned, the stopped sewing needle N2 is operated to form two parallel stitches S1b and S2b.
【0017】 以上のようにして片針停止機能を備えたミシンでは、単に直線的な2本の縫目 を平行に形成する平行縫いに限らず、屈曲した縫目Sを形成することも可能とな っている。In the sewing machine having the one-needle stopping function as described above, it is possible to form not only parallel stitches that form two straight stitches in parallel but also bent stitches S. I am
【0018】[0018]
しかしながら、上記先行技術としての上糸供給装置は、両縫い針N1,N2が 同時に作動している状況下では上糸供給作用が適正に機能し、双方の縫目に良好 な糸締まりを与えることができるが、縫製中に片針縫いを含めるような縫製動作 を行った場合には、停止させた縫い針を再び作動させた際に、作動再開後の数針 において、供給される糸量が過剰になり、十分な糸締まりを得ることができない という問題が発生した。例えば、図11に示すような縫目を形成した場合、縫い 針N2の作動再開後の数針によって形成される縫目S2bに十分な張力が得られ ず、図12に示すように縫目に弛みが発生した。 However, the needle thread feeder as the above-mentioned prior art is capable of properly functioning the needle thread feeder under the condition that both sewing needles N1 and N2 are operating at the same time and giving a good thread tightness to both stitches. However, if the sewing operation that includes one-needle sewing is performed during sewing, when the stopped sewing needle is operated again, the amount of thread to be supplied will not be There was a problem that it became excessive and it was not possible to obtain sufficient thread tightness. For example, when the stitches as shown in FIG. 11 are formed, sufficient tension cannot be obtained in the stitch S2b formed by several stitches after the operation of the sewing needle N2 is restarted, and the stitches as shown in FIG. Looseness has occurred.
【0019】 これは、停止させた縫い針に連なる上糸が次のような挙動をとることに起因す る。This is because the needle thread connected to the stopped sewing needle behaves as follows.
【0020】 すなわち、縫い針N2が停止し、糸I2が消費されない状態にあっても、図1 0(ロ)に示すように糸挿通部8a,8b間に繰り出された上糸I2は、上糸繰 り出し部材14の上昇後、天秤の上下動等によって縫い針N2側へ移動してしま い、糸挿通部8a,8b間に存在する糸量が減少する。そして、糸挿通部8a, 8b間の糸が減少すると、その減少分は上糸繰り出し部材14によって再び上糸 供給源側から繰り出されることとなり、この動作を繰り返し行うことにより、停 止期間中に上糸I2は序々に縫い針側に蓄積される。このため、縫い針N2によ る縫製動作を再開した際に、蓄積された上糸I2が縫い始めの数針に供給されて 糸量が過剰となり、これが図12に示すような縫目S2bの弛みとなって現れ、 縫製品質が著しく損われる結果となった。That is, even when the sewing needle N2 is stopped and the thread I2 is not consumed, the upper thread I2 fed out between the thread insertion portions 8a and 8b as shown in FIG. After the thread take-up member 14 is lifted, it moves to the sewing needle N2 side due to the vertical movement of the thread take-up or the like, and the amount of thread existing between the thread insertion portions 8a and 8b decreases. When the number of yarns between the yarn threading portions 8a and 8b decreases, the reduced amount is again fed from the upper yarn feed source side by the upper yarn feeding member 14, and by repeating this operation, during the stop period. The upper thread I2 is gradually accumulated on the sewing needle side. Therefore, when the sewing operation by the sewing needle N2 is restarted, the accumulated upper thread I2 is supplied to several stitches at the beginning of sewing, and the thread amount becomes excessive, which causes the stitch S2b as shown in FIG. It appeared as slack, and the quality of the sewn product was significantly impaired.
【0021】 この考案は、上記問題点に着目してなされたもので、2本針ミシンの片針停止 期間にあっても適量の上糸を供給することができる上糸供給装置の提供を目的と する。The present invention has been made in view of the above problems, and an object thereof is to provide an upper thread supply device capable of supplying an appropriate amount of upper thread even when the one-needle of a two-needle sewing machine is stopped. And
【0022】[0022]
この考案は、片針停止機能を備えた2本針ミシンと、この2本針ミシンに設け られた第1,第2の上糸供給源から各縫い針に至る各上糸供給経路における各上 糸を同時に挟持、解放する第1の上糸挟持機構と、前記第1の上糸挟持機構から 各縫い針に至る各上糸供給経路中で両上糸の挟持、解放を同時に行う第2の上糸 挟持機構と、前記両上糸挟持機構の間に位置する各上糸供給経路と交叉するよう 揺動して各上糸供給経路を同時に増大させる上糸繰り出し部材と、を備え、ミシ ン主軸の1回転において前記第1の上糸挟持機構と第2の上糸挟持機構とにより 交互に上糸を挟持させると共に、第2の上糸挟持機構による上糸挟持期間におい て前記上糸繰り出し部材を揺動させることにより上糸供給源側から上糸を繰り出 すようにした2本針ミシンの上糸供給装置において、前記第1の上糸供給源から 第1の上糸挟持機構に至る上糸供給経路中に位置し上糸の保持、解放を行う第1 の保持機構と、前記第2の上糸供給源から第1の上糸挟持機構に至る上糸供給経 路中に位置し上糸の保持、解放を行う第2の保持機構と、前記片針停止レバーに 連動して前記各による上糸保持、解放動作を選択的に実行させる選択機構と、を 備え、前記選択機構は、2本針ミシンに設けられた片針停止レバーにより指示さ れた不作動とすべき縫い針に連なる上糸を一方の保持機構にて保持させると共に 、作動させる縫い針を他方の保持機構にて解放させるようにしたものである。 This invention is a two-needle sewing machine having a one-needle stopping function, and each upper thread in each upper thread supply path from the first and second upper thread supply sources provided in this two-needle sewing machine to each sewing needle. A first upper thread clamping mechanism that simultaneously clamps and releases the thread, and a second upper thread clamping mechanism that simultaneously clamps and releases both upper threads in each upper thread supply path from the first upper thread clamping mechanism to each sewing needle. The machine includes a needle thread holding mechanism and an upper thread feeding member that swings so as to intersect with the respective upper thread feeding paths located between the two upper thread holding mechanisms to simultaneously increase the respective upper thread feeding paths. The upper thread is alternately clamped by the first upper thread clamping mechanism and the second upper thread clamping mechanism in one rotation of the main shaft, and the upper thread is fed out during the upper thread clamping period by the second upper thread clamping mechanism. By swinging the member, the upper thread is fed from the upper thread supply source side 2 In the needle thread supply device of the needle sewing machine, a first holding mechanism which is located in the needle thread supply path from the first needle thread supply source to the first needle thread holding mechanism and which holds and releases the upper thread, The second holding mechanism for holding and releasing the upper thread, which is located in the upper thread supply path from the second upper thread supply source to the first upper thread holding mechanism, and the single needle stop lever are interlocked. And a selection mechanism for selectively executing the needle thread holding and releasing operations by each of the above, and the selection mechanism should be inactivated as instructed by a one-needle stop lever provided in a two-needle sewing machine. The needle thread connected to the sewing needle is held by one holding mechanism, and the sewing needle to be operated is released by the other holding mechanism.
【0023】[0023]
この考案において、作業者が片針停止レバーによって一方の縫い針の停止を指 示すると、その縫い針に連なる上糸供給経路中に設けられた保持機構が選択機構 によって上糸を保持する。このため、片針停止期間中の上糸繰り出し部材の動作 によって、停止した縫い針に連なる上糸が上糸供給源側から新たに引き出される ことはなくなり、上糸保持機構から停止した縫い針に至る間の糸量は一定に保た れる。従って、その後縫い針の作動を再開させた場合にも、上糸が過剰に供給さ れる恐れはなく、良好な糸締まりを得ることができる。 In this invention, when the operator instructs the stop of one sewing needle by the one-needle stop lever, the holding mechanism provided in the needle thread supply path connected to the sewing needle holds the upper thread by the selection mechanism. For this reason, the upper thread continuing to the stopped sewing needle is not newly drawn out from the upper thread supply source side by the operation of the upper thread feeding member during the one-needle stop period, and the needle thread holding mechanism stops The yarn amount is kept constant throughout the process. Therefore, even when the operation of the sewing needle is restarted thereafter, there is no fear that the upper thread will be excessively supplied, and good thread tightness can be obtained.
【0024】[0024]
以下、この考案の一実施例を図1ないし図4に基づき説明する。 なお、前記先行技術と同一もしくは相当部分には同一符号を付しその説明の詳 細は省く。 この実施例における上糸供給装置は、前記先行技術における上糸供給装置に対 し、次のような構成を付加したものである。 An embodiment of the present invention will be described below with reference to FIGS. It should be noted that the same or corresponding parts as those of the above-mentioned prior art are denoted by the same reference numerals, and detailed description thereof will be omitted. The needle thread feeder in this embodiment is the same as the needle thread feeder in the above-mentioned prior art, but has the following configuration.
【0025】 図において、20は第1の保持部材(第1の保持機構)であり、21は第2の 保持部材(第2の保持機構)である。このうち第1の保持解放機構20は、第1 の糸巻き(第1の上糸供給源)B1から第1の挟持部材16(第1の上糸挟持機 構)に至る上糸I1の供給経路中に設けられ、第2の保持機構21は第2の糸巻 き(第2の上糸供給源)B2から第1の挟持部材16(第1の上糸挟持機構)に 至る上糸I2の供給経路中に設けられている。In the figure, 20 is a first holding member (first holding mechanism), and 21 is a second holding member (second holding mechanism). The first holding / releasing mechanism 20 is a supply path for the upper thread I1 from the first bobbin (first upper thread supply source) B1 to the first holding member 16 (first upper thread holding mechanism). The second holding mechanism 21 provided therein supplies the upper thread I2 from the second thread winding (second upper thread supply source) B2 to the first clamping member 16 (first upper thread clamping mechanism). It is provided in the route.
【0026】 また第1の保持部材20は図2及び図4に示すような構成を有する。すなわち 、20aは糸調子台2に固定された円筒状の支軸であり、この支軸20aには、 一対の保持皿20b,20cが挿通されると共に、先端部に調節摘み20dが螺 合されている。また、この調節摘み20dと一方の保持皿20cとの間には、ば ね20eが介装されており、このばねの付勢力によって常には両保持皿20b, 20cが互いに圧接するようになっている。前記支軸20a内には、解放軸20 fが移動可能に挿通されており、この解放軸20fを矢符a方向へ向けて移動さ せることにより、その前端部が一方の保持皿20cをばね の付勢力に抗して同 方向へ押圧し、両保持皿20b,20cの圧接状態を解除し得るようになってい る。なお、第2の保持部材21においても第1の保持部材20と同様に、支軸2 1a、保持皿21b,21c、調節摘み21d、ばね21e及び解放軸21fを 備えている。The first holding member 20 has a structure as shown in FIGS. 2 and 4. That is, 20a is a cylindrical support shaft fixed to the thread tension stand 2, and a pair of holding trays 20b and 20c are inserted into the support shaft 20a, and an adjusting knob 20d is screwed into the tip end portion. ing. Further, a bar 20e is interposed between the adjusting knob 20d and one holding plate 20c, and the holding plates 20b and 20c are always in pressure contact with each other by the biasing force of this spring. There is. A release shaft 20f is movably inserted into the support shaft 20a. By moving the release shaft 20f in the direction of the arrow a, the front end of the release shaft 20f springs one holding tray 20c. The holding plates 20b and 20c can be released from the pressed state by pressing in the same direction against the urging force of the holding plates 20b and 20c. The second holding member 21 is also provided with the support shaft 21a, the holding plates 21b and 21c, the adjusting knob 21d, the spring 21e, and the release shaft 21f, similarly to the first holding member 20.
【0027】 また、22は2本針ミシンMにおいて片針停止の指示を行う周知の片針停止レ バーである。この片針停止レバー22は、ミシンアーム1に支持された支点軸2 3を中心にある一定の範囲内で回動させることができ、その範囲内のL,C,R で示される3つの位置において、それぞれ、左針停止(N1停止)、2本針使用 (N1,N2使用)、右針停止(N1停止)の切換えが行われるようになってい る。なお、この片針停止レバーは、前記第1,第2の保持部材20,21を支持 する糸調子台2とミシンアーム1の前面との間に糸形成される隙間に位置してい る。Reference numeral 22 is a known one-needle stop lever for instructing one-needle stop in the two-needle sewing machine M. The one-needle stop lever 22 can be rotated within a certain range centered on the fulcrum shaft 23 supported by the sewing machine arm 1, and within the range, three positions indicated by L, C, and R are shown. In, the left needle stop (N1 stop), double needle use (N1, N2 use), and right needle stop (N1 stop) are switched respectively. The one-needle stop lever is located in a gap formed between the thread tension base 2 supporting the first and second holding members 20 and 21 and the front surface of the sewing machine arm 1 for thread formation.
【0028】 24は前記片針停止レバー22の前面に固定した選択機構としての皿解放部材 である。この皿解放部材24には、前記各保持部材20,21に対応して図4に 示すような第1のカム部25と第2のカム部26とが形成されており、第1のカ ム部25の前面には解放軸20fが、第2のカム部26の前面には解放軸21f がそれぞればね20e,21eの付勢力によって圧接するようになっている。ま た、各カム部25,26の前面には、それぞれ低位面25a,26aと高位面2 5b,26bが形成されており、これらと前記各保持部材20,21の解放軸2 0f,21fとの位置関係は、次のようになっている。Reference numeral 24 denotes a plate releasing member as a selection mechanism fixed to the front surface of the one-needle stop lever 22. The dish releasing member 24 is provided with a first cam portion 25 and a second cam portion 26 as shown in FIG. 4 corresponding to the holding members 20 and 21, respectively. The release shaft 20f is in pressure contact with the front surface of the portion 25, and the release shaft 21f is in pressure contact with the front surface of the second cam portion 26 by the urging forces of the springs 20e, 21e. Further, low-level surfaces 25a, 26a and high-level surfaces 25b, 26b are formed on the front surfaces of the cam portions 25, 26, respectively, and these and the release shafts 20f, 21f of the holding members 20, 21 are formed. The positional relationship of is as follows.
【0029】 すなわち、片針停止レバー22がC位置にある時、第1,第2のカム部25, 26の高位面25b,26bはいずれも各保持部材25,26の解放軸20f, 21fと接合している(図4(a)参照)。このとき、各解放軸20f,21f は各高位面25b,26bによりばね20e,21eに抗して押し出され、保持 皿20bと20c、及び21bと21cはそれぞれ開状態となる。That is, when the one-needle stop lever 22 is in the C position, the high-level surfaces 25b and 26b of the first and second cam portions 25 and 26 are the release shafts 20f and 21f of the holding members 25 and 26, respectively. They are joined (see FIG. 4 (a)). At this time, the release shafts 20f and 21f are pushed out by the high-level surfaces 25b and 26b against the springs 20e and 21e, and the holding trays 20b and 20c and 21b and 21c are opened.
【0030】 また、片針停止レバー22がL位置にあるとき、第1の保持部材20の解放軸 20fには低位面25aが接合し、第2の保持部材21の解放軸21fには高位 面26bが接合する。このため、第1の保持部材の保持皿20bと20cはばね 20eの付勢力により互いに圧接した状態となり、第2の保持部材20における 保持皿20は開状態となる。Further, when the one-needle stop lever 22 is in the L position, the lower surface 25a is joined to the release shaft 20f of the first holding member 20, and the higher surface is attached to the release shaft 21f of the second holding member 21. 26b joins. Therefore, the holding trays 20b and 20c of the first holding member are brought into pressure contact with each other by the urging force of the spring 20e, and the holding tray 20 of the second holding member 20 is opened.
【0031】 さらに、片針停止レバー23がR位置にある時には、第1の保持部材20の解 放軸20fには、高位面25bが接合し、第2の保持部材21の解放軸21fに は、低位面26aが接合するため、保持皿20bと20cは開状態となり、保持 皿21bと21cは閉状態となる。Further, when the one-needle stop lever 23 is in the R position, the release shaft 20f of the first holding member 20 is joined to the high surface 25b, and the release shaft 21f of the second holding member 21 is not. Since the lower surface 26a is joined, the holding pans 20b and 20c are opened and the holding pans 21b and 21c are closed.
【0032】 このように、この実施例では、片針停止レバー22をR,C,Lへ移動させる ことにより、第1,第2の保持部材20,21の保持皿の開閉状態、すなわち上 糸I1,I2の保持、解放状態が切り換えられるようになっている。 なお、その他の構成は前記先行技術と同一である。As described above, in this embodiment, by moving the one-needle stop lever 22 to R, C, L, the opened / closed state of the holding trays of the first and second holding members 20, 21, that is, the upper thread The holding and releasing states of I1 and I2 can be switched. The rest of the configuration is the same as that of the prior art.
【0033】 以上のように構成された上糸供給装置において、例えば、図11に示すような 屈曲した縫目S1,S2を形成する場合には、まず、片針停止レバー22をC位 置に移動させ、両縫い針N1,N2を作動状態として平行する2本の縫目S1a ,S2aを形成して行く。この際、両保持部材20,21の保持皿20b,20 c及び21b,21cは共に開状態となっているため、これら保持皿は各上糸I 1,I2には何等影響せず、上糸繰り出し部材14の上下動によって1針毎に適 量の上糸I1,I2は第1,第2の上糸供給源B1,B2から繰り出され、各縫 目に適正な糸締まりが得られる。In the needle thread feeder configured as described above, for example, when forming the bent stitches S1 and S2 as shown in FIG. 11, first, the one-needle stop lever 22 is set to the C position. The needles N1 and N2 are moved to form the two parallel stitches S1a and S2a while the sewing needles N1 and N2 are in the operating state. At this time, since the holding plates 20b, 20c and 21b, 21c of both holding members 20, 21 are both in the open state, these holding plates do not affect the respective upper yarns I1, I2, and the upper yarns I1, I2 are not affected. By the vertical movement of the feeding member 14, an appropriate amount of the upper thread I1, I2 is fed out from each of the first and second upper thread supply sources B1, B2 for each stitch, and an appropriate thread tightness can be obtained at each stitch.
【0034】 ここで、縫目S2aが予定の屈曲点P2に達すると、作業者は片針レバー22 をR位置へと移動させて縫い針N2の作動を停止し、一方の縫い針N1のみによ って縫製動作を行ってゆき、途中布Wを回転させることにより縫目S1aに対し て屈曲する縫目S1bを形成して行く。この間、第1の保持部材20は引き続き 開状態となっているため、上糸I1は1針毎に第1の上糸供給源B1から繰り出 され、縫目S1aには適正な糸締まりが得られる。Here, when the stitch S2a reaches the predetermined bending point P2, the operator moves the one-needle lever 22 to the R position to stop the operation of the sewing needle N2, and only one sewing needle N1 is moved. Accordingly, the sewing operation is performed, and the cloth W is rotated midway to form the seam S1b that is bent with respect to the seam S1a. During this time, since the first holding member 20 is still in the open state, the needle thread I1 is fed out from the first needle thread supply source B1 for each stitch, and the proper thread tightness is obtained at the stitch S1a. Be done.
【0035】 これに対し、第2の保持部材21は閉状態となって確固に上糸I2を保持して いるため、上糸繰り出し部材14の上下動によって、第2の上糸供給源B2から 新たに上糸I2が繰り出されることはない。つまり、この片針縫い停止期間中に は、第2の保持部材21から縫い針N2に至る上糸量は一定に保たれる。 この上糸量は、片針停止時直前の1針で、上糸繰り出し部材14により上糸供 給源B2から一対の糸挿通部7aと7bとの間に繰り出された1ピッチ分の上糸 量を含んだ量である。従って、次に片針停止レバー22をC位置に保持させ、縫 い針N2の作動を再開させた場合には、片針停止直前に繰り出された上糸が縫目 に供給されるため、再開後の第1針目から良好な糸締まりで縫目を形成すること ができる。On the other hand, since the second holding member 21 is in the closed state and holds the upper thread I2 securely, the upper and lower movements of the upper thread feeding member 14 cause the upper thread I2 to move from the second upper thread supply source B2. The upper thread I2 is not newly fed. That is, during the one-needle sewing stop period, the amount of the upper thread from the second holding member 21 to the sewing needle N2 is kept constant. The upper thread amount is one stitch immediately before the stop of one needle, and the upper thread amount for one pitch is fed by the upper thread feeding member 14 from the upper thread supply source B2 between the pair of thread insertion portions 7a and 7b. It is the amount including. Therefore, when the one-needle stop lever 22 is then held at the C position and the operation of the sewing needle N2 is restarted, the needle thread fed immediately before the one-needle stop is supplied to the stitch, and the restart is resumed. It is possible to form a stitch with good thread tightness from the subsequent first stitch.
【0036】 なお、片針停止動作直前の1針で糸挿通部7a,7b間に繰り出された上糸量 は、先の先行技術にて述べたように天秤Tの上下動等によって減少するが、この 減少分は、上糸繰り出し部材14の上下動において、縫い針N2側から引き戻さ れて補われるか、あるいはまた、上糸I2の伸びによって補われる。つまり、第 2の保持部材21から縫い針N2に至る上糸I2の総合量は変化しない。It should be noted that the upper thread amount fed out between the thread insertion portions 7a and 7b by one needle immediately before the one-needle stopping operation is reduced by the vertical movement of the balance T, etc., as described in the above prior art. This decrease is compensated by pulling back from the sewing needle N2 side in the vertical movement of the needle thread feeding member 14 or by the elongation of the needle thread I2. That is, the total amount of the upper thread I2 from the second holding member 21 to the sewing needle N2 does not change.
【0037】 また、ここでは、縫い針N2の動作を停止させる場合を説明したが、縫い針N 1を停止させる場合にも、同様に適正な糸締まりの縫目を形成することができる ことは言うまでもない。Further, although the case where the operation of the sewing needle N2 is stopped has been described here, it is possible to similarly form a stitch with an appropriate thread tightness when stopping the sewing needle N1. Needless to say.
【0038】 ところで、上記実施例においては、第1,第2の保持機構として、ばね力にて 上糸を保持するものを一例として用いたが、この保持機構としては特に上記実施 例に示したものに限らず、その他のものも適用可能である。例えば、電気的マグ ネットの駆動力や空気圧機器の駆動力を用いたものも適用可能であり、要は上糸 の挟持解放を自在に行い得るものであれば、いかなるものも適用可能である。By the way, in the above-mentioned embodiment, as the first and second holding mechanisms, the one that holds the upper thread by the spring force is used as an example, but this holding mechanism is particularly shown in the above-mentioned embodiment. Not limited to the above, other types are also applicable. For example, the one using the driving force of an electric magnet or the driving force of a pneumatic device can be applied, and in short, any one can be applied as long as the needle thread can be freely clamped and released.
【0039】 また、第1,第2の保持機構を駆動させる選択機構として、この実施例では、 片針停止レバー22に設けた皿解放部材24を用いたが、片針停止レバー22の 回動位置を検出する検出手段と、その検出手段に応じて上述のようなマグネット あるいは空気圧機器をON/OFFさせる制御手段とによって選択機構を構成す ることも可能である。Further, as the selection mechanism for driving the first and second holding mechanisms, the dish releasing member 24 provided on the one-needle stop lever 22 is used in this embodiment, but the rotation of the one-needle stop lever 22 is changed. It is also possible to configure the selection mechanism by the detection means for detecting the position and the control means for turning on / off the magnet or the pneumatic equipment as described above according to the detection means.
【0040】[0040]
以上説明したとおり、この考案は、2本針ミシンの片針停止レバーに連動して 各縫い針に連なる各上糸を保持する上糸保持部材を設け、作動を停止させた縫い 針に連なる上糸を確固に保持するようにしたことにより、片針停止時に停止させ た縫い針に連なる上糸が上糸供給源側から不用に繰り出されるのを防止すること ができるようになり、縫い針の作動を再開させた場合にも、再開後の第1針目か ら適正な糸締まりで縫目を形成することが可能となり、優れた縫製品質が得られ る。 As described above, the present invention is provided with the needle thread holding member for holding the respective needle threads connected to the respective sewing needles in conjunction with the one-needle stop lever of the two-needle sewing machine so that the upper needles connected to the sewing needles whose operation is stopped are connected. By holding the thread firmly, it is possible to prevent the upper thread connected to the sewing needle stopped when one needle is stopped from being unnecessarily fed out from the upper thread supply source side. Even when the operation is restarted, it is possible to form a stitch with an appropriate thread tightness from the first stitch after the restart, and an excellent sewn product quality can be obtained.
【図面の簡単な説明】[Brief description of drawings]
【図1】この考案の一実施例を示す平面図である。FIG. 1 is a plan view showing an embodiment of the present invention.
【図2】同実施例に示したものの一部縦断側面図であ
る。FIG. 2 is a partially longitudinal side view of what is shown in the embodiment.
【図3】図1に示したものを備えた2本針ミシンの外観
斜視図である。FIG. 3 is an external perspective view of a two-needle sewing machine including the one shown in FIG.
【図4】図1に示したものの保持部材の動作状態を示す
図で、(a)は片針停止レバーをC位置に設定した時の
状態を示す平面図、(b)は片針停止レバーをL位置に
設定した時の状態を示す平面図,(c)は片針停止レバ
ーをR位置に設定した時の状態を示す平面図である。4A and 4B are diagrams showing the operating state of the holding member shown in FIG. 1, in which FIG. 4A is a plan view showing a state in which the one-needle stop lever is set to the C position, and FIG. Is a plan view showing a state when the lever is set to the L position, and (c) is a plan view showing a state when the one-needle stop lever is set to the R position.
【図5】この考案の先行技術を示す斜視図である。FIG. 5 is a perspective view showing a prior art of the present invention.
【図6】図5に示したものを設ける2本針ミシンのミシ
ンアームを示す正面図である。FIG. 6 is a front view showing a sewing machine arm of the two-needle sewing machine provided with the sewing machine shown in FIG.
【図7】図6に示したものの要部拡大正面図である。FIG. 7 is an enlarged front view of the main part of what is shown in FIG.
【図8】図7に示したものの縦断側面図である。8 is a vertical side view of what is shown in FIG. 7. FIG.
【図9】図7に示した上糸挟持部材の縦断側面図であ
る。9 is a vertical sectional side view of the needle thread holding member shown in FIG.
【図10】図7に示したものの上糸繰り出し部材による
上糸繰り出し状態を示す作用説明図である。10 is an operation explanatory view showing a state where the upper thread delivering member shown in FIG. 7 delivers the upper thread.
【図11】2本針ミシンの片針停止機能を用いて形成さ
れる縫目の一形態を示す説明平面図である。FIG. 11 is an explanatory plan view showing one form of a seam formed by using the one-needle stopping function of the two-needle sewing machine.
【図12】この考案の先行技術を用いて図11に示す縫
目を形成した場合の部分拡大説明平面図である。FIG. 12 is a partially enlarged explanatory plan view of the case where the seam shown in FIG. 11 is formed by using the prior art of the present invention.
M 2本針ミシン 1 ミシンアーム N1,N2 縫い針 11 ミシン上軸 14 上糸繰り出し部材 16 第1の挟持部材(第1の上糸挟持機構) 17 第2の挟持部材(第2の上糸挟持機構) B1 第1の糸捲き B2 第2の糸巻き 20 第1の保持部材(第1の保持機構) 21 第2の保持部材(第2の保持機構) 24 皿解放部材(選択機構) M 2 needle sewing machine 1 sewing machine arm N1, N2 sewing needle 11 sewing machine upper shaft 14 upper thread feeding member 16 first clamping member (first upper thread clamping mechanism) 17 second clamping member (second upper thread clamping) Mechanism) B1 First bobbin B2 Second bobbin 20 First holding member (first holding mechanism) 21 Second holding member (second holding mechanism) 24 Dish release member (selection mechanism)
Claims (1)
された一対の縫い針と、前記各縫い針に対して供給すべ
き上糸を保持する第1,第2の上糸供給源とを備えると
共に、前記各縫い針のうち片針停止レバーによって指示
された一方の縫い針を針板上方で不作動とし、他方の縫
い針によって縫製動作を行い得るようにした2本針ミシ
ンと、 前記第1,第2の上糸供給源から各縫い針に至る各上糸
供給経路における各上糸を同時に挟持、解放する第1の
上糸挟持機構と、 前記第1の上糸挟持機構から各縫い針に至る各上糸供給
経路の途中に位置し、両上糸を同時に挟持、解放する第
2の上糸挟持機構と、 ミシン上軸の回転に同期して前記両上糸挟持機構の間に
位置する各上糸供給経路と交叉する揺動経路を揺動し、
各上糸供給経路を同時に増大させる上糸繰り出し部材
と、を備え、 ミシン主軸の1回転において前記第1,第2の上糸挟持
機構を交互に挟持、解放させると共に、第2の上糸挟持
機構による上糸挟持期間において前記上糸繰り出し部材
を揺動させるようにした2本針ミシンの上糸供給装置に
おいて、 前記第1の上糸供給源から第1の上糸挟持機構に至る上
糸供給経路中に位置し、上糸の保持、解放を行う第1の
保持機構と、 前記第2の上糸供給源から第1の上糸挟持機構に至る上
糸供給経路中に位置し、上糸の保持、解放を行う第2の
保持機構と、 前記片針停止レバーに連動して前記各による上糸保持、
解放動作を選択的に実行させる選択機構と、を備え、 前記選択機構は、前記片針停止レバーにて指示された不
作動とすべき縫い針に連なる上糸を一方の保持機構にて
保持させると共に、作動させるべき縫い針に連なる他方
の保持機構にて解放させることを特徴とする2本針ミシ
ンの上糸供給装置。1. A pair of sewing needles that are independently supported by a sewing machine arm so as to be able to move up and down, and first and second needle thread supply sources that hold needle threads to be supplied to the respective sewing needles. A two-needle sewing machine, wherein one of the sewing needles designated by the one-needle stop lever is inoperative above the needle plate and the other sewing needle is capable of performing a sewing operation; A first upper thread clamping mechanism for simultaneously clamping and releasing each upper thread in each upper thread supply path from the first and second upper thread supply sources to each sewing needle; and each of the first upper thread clamping mechanism. Between the second upper thread clamping mechanism which is located in the middle of each upper thread supply path to the sewing needle and clamps and releases both upper threads at the same time, and between the upper thread clamping mechanisms which are synchronized with the rotation of the upper shaft of the sewing machine. Rocking the rocking path that intersects with each needle thread supply path located at
An upper thread feeding member that simultaneously increases the respective upper thread supply paths, and alternately holds and releases the first and second upper thread holding mechanisms in one rotation of the sewing machine main spindle, and at the same time, the second upper thread holding mechanism. A needle thread feeder for a two-needle sewing machine in which the needle thread feeding member is oscillated during a needle thread holding period by a mechanism, in which a needle thread from the first needle thread source to the first needle thread holding mechanism is provided. A first holding mechanism located in the supply path for holding and releasing the upper thread; and an upper thread supply path extending from the second upper thread supply source to the first upper thread pinching mechanism, A second holding mechanism for holding and releasing the thread, and needle thread holding by each of the above in conjunction with the one-needle stop lever,
A selection mechanism for selectively executing a releasing operation, wherein the selection mechanism holds, by one holding mechanism, a needle thread connected to a sewing needle to be inactivated, which is instructed by the one-needle stop lever. At the same time, the needle thread supply device for a two-needle sewing machine is characterized in that it is released by the other holding mechanism connected to the sewing needle to be operated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10785091U JPH0556079U (en) | 1991-12-27 | 1991-12-27 | Two-needle sewing machine needle thread feeder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10785091U JPH0556079U (en) | 1991-12-27 | 1991-12-27 | Two-needle sewing machine needle thread feeder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0556079U true JPH0556079U (en) | 1993-07-27 |
Family
ID=14469649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10785091U Pending JPH0556079U (en) | 1991-12-27 | 1991-12-27 | Two-needle sewing machine needle thread feeder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0556079U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010263976A (en) * | 2009-05-13 | 2010-11-25 | Juki Corp | Decorative stitch sewing machine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5720040A (en) * | 1980-06-13 | 1982-02-02 | Nec Corp | Radio individual selective calling system |
-
1991
- 1991-12-27 JP JP10785091U patent/JPH0556079U/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5720040A (en) * | 1980-06-13 | 1982-02-02 | Nec Corp | Radio individual selective calling system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010263976A (en) * | 2009-05-13 | 2010-11-25 | Juki Corp | Decorative stitch sewing machine |
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