JPS5940893A - Needle yarn supply apparatus of sewing machine - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 この発明は、作用により針糸を通過不可能に挾持し不作
用により針糸を通過可能に解放するように相対的に針糸
供給方向手前の第一保持手段と先方の第二保持手段及び
両保持手段間の針糸経路を天秤による針糸弛緩時期に増
大し減少させるように作用する繰り出し体とにより、−
縫目形成毎に必要な長さの針糸を予め繰り出すようにし
たミシンの針糸供給装置に関し、特に針糸の繰り出しに
連動して回転する回転体の回転角を検知する検出装置に
より、−縫目形成毎に繰り出された糸量を検知し、それ
が設定量に達したとき第一保持手段を作用して次の縫目
形成まで針糸の繰り出しを阻止する型式ものにおいて、
検出装置の回転体を両保持手段間の針糸に係合するよう
に配置したことを特徴とする。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first holding means in the front side in the needle thread supply direction and a first holding means in the front side in the needle thread supply direction so as to clamp the needle thread so that the needle thread cannot pass therethrough by action and to release the needle thread so that the needle thread can pass through by non-action. a second holding means and a feeding body which acts to increase and decrease the needle thread path between the two holding means during the relaxation period of the needle thread by the thread take-up;
Regarding a needle thread supply device for a sewing machine that pre-feeds out a necessary length of needle thread each time a stitch is formed, in particular, by a detection device that detects the rotation angle of a rotating body that rotates in conjunction with the needle thread being fed out, - In a type of device that detects the amount of thread let out each time a stitch is formed, and when the amount reaches a set amount, the first holding means is activated to prevent the needle thread from being let out until the next stitch is formed.
It is characterized in that the rotating body of the detection device is arranged so as to engage with the needle thread between both the holding means.

従来、この種の装置では、天秤による針糸弛緩時期に第
一保持手段のみを不作用にして繰り出し体の作用により
針糸を糸巻から両保持手段間に繰り込み、必要な糸量が
繰り込まれたことを検出装℃１ 置により検知されたら第一保持手段を作用のてから第二
保持手段を不作用とし、天秤による針糸緊張時期にその
針糸を天秤へ供給して縫目に消費するものである。しか
し検出装置の回転体を両保持手段間の外、即ち第一保持
手段と糸巻（ペーステンション）との間に配置すると、
必要な糸量が両保持手段間に繰り込捷れたことにより第
一保持手段が作用となった時に回転体が慣性力によりオ
ーバー回転するため、第一保持手段と糸巻間の針糸経路
にたるみが生じ、特に第一保持手段と回転体との間にた
るみが多くできると、次′の繰り出し体による繰り出し
時にそのたるみが両保持手段間に全部繰り込まれてから
回転体が回り始めるので、−縫目毎に必要糸量を正確に
供給することができない欠点を生ずる。Conventionally, in this type of device, when the needle thread is relaxed by the thread take-up, only the first holding means is inactive, and the needle thread is fed from the bobbin winding between the two holding means by the action of the feeding body, so that the required amount of thread is drawn in. When the detection device detects this, the first holding means is activated and the second holding means is deactivated, and when the thread take-up is tensioning the needle thread, the needle thread is supplied to the thread take-up and consumed for stitching. It is something to do. However, if the rotating body of the detection device is placed outside between the two holding means, that is, between the first holding means and the spool (pace tension),
When the first holding means is activated due to the required amount of thread being drawn between both holding means, the rotating body over-rotates due to inertia, so that the needle thread path between the first holding means and the bobbin winder is If slack occurs, especially if there is a large amount of slack between the first holding means and the rotating body, the rotating body will begin to rotate after all of the slack is drawn between both holding means when the next feeding body is fed out. , - This results in the disadvantage that it is not possible to accurately supply the required amount of thread for each stitch.

この発明は上記した従来の欠点を解消することを目的と
する。This invention aims to eliminate the above-mentioned conventional drawbacks.

以下この発明の実施例を図面により説明する。Embodiments of the present invention will be described below with reference to the drawings.

機械構成について ミシンは詳細に図示しないが駆動源に連動して回転する
主軸と、針糸Ｔをもつミシン針を固定し主軸に連動して
上下動する針棒と、針糸供給源としての糸巻とミシン針
との間の針糸Ｔを支持し針糸Ｔを繰返して緊張・弛緩す
るように主軸に連動し、且つ第３図に示す針棒上死点を
００　　としたタイミング曲線（天秤曲線）に従い三位
置間を往復動する天秤ｌとを備えだ公知のものである。Although the sewing machine is not shown in detail, the sewing machine has a main shaft that rotates in conjunction with a drive source, a needle bar that fixes the sewing machine needle with needle thread T and moves up and down in conjunction with the main shaft, and a bobbin spool that serves as a needle thread supply source. It supports the needle thread T between the needle and the sewing machine needle, and is linked to the main shaft so that the needle thread T is tensioned and relaxed repeatedly. ) and a balance l that reciprocates between three positions according to the above-described method.

保持手段２，３は天秤ｌと糸巻との間の針糸経路上にお
いて、相対的に糸巻から天秤１に向う針糸供給方向の先
方と手前に離隔して配置し、各別に連結した電磁石（Ｓ
ＱＬ、ｌ）、４及び電磁石（ＳＱＬ、２）５と、これら
の励磁により接合し、非励磁により離隔するようにした
一対の保持板２ａ、２ｂ及び３ａ、３ｂからなり、これ
ら保持板が接合することにより針糸Ｔを移動不可能に挾
持し、且つ離隔することにより針糸Ｔを移動可能に解放
する。The holding means 2 and 3 are arranged on the needle thread path between the thread take-up lever 1 and the thread take-up lever 1 at a distance from each other in the direction of supplying the needle thread from the thread take-up thread take-up to the thread take-up lever 1, and are connected to electromagnets ( S
QL, l), 4 and an electromagnet (SQL, 2) 5, and a pair of holding plates 2a, 2b and 3a, 3b which are joined by excitation and separated by de-excitation, and these retaining plates are joined. By doing so, the needle thread T is immovably clamped, and by separating, the needle thread T is movably released.

案内板６．７は両保持手段２．３間の針糸経路の両側に
離隔し且つ垂直に固定配置すると共に、それぞれ中間に
開口６ａ、７ａを形成する。ミシン機枠の上部８には両
案内板６．７の隙間に対向して長溝８ａを形成する。The guide plates 6.7 are spaced apart and fixedly arranged vertically on both sides of the needle thread path between the two holding means 2.3, and define openings 6a, 7a in the middle, respectively. A long groove 8a is formed in the upper part 8 of the sewing machine frame so as to face the gap between the guide plates 6.7.

繰り出し体９は、機枠に固定しだ軸ｌＯに中間な回動自
在に支持しだ揺動体１１と、揺動体１１の上方部に軸ｌ
Ｏと平行な軸１２を中心に回動自在に支持し、且つ揺動
体１１との間に張り渡しだコイルはね１３により常には
揺動体１１に固定したゴム材からなる突出部１１ａに圧
接するように第１図の時計方向に弾性力を作用した繰り
出し腕１４とからなり、両案内板６，７の開口６ａ、７
ａ内に関連配置する。繰り出し腕１４は、第４図のよう
に上端面１４ａを右下りに傾斜させて上方部をＴ字状に
形成し、その右隅を糸掛部１４ｂとする。また繰り出し
体１４をして、第３図に示しだ様に天秤ｌによる針糸Ｔ
の弛緩時期には両保持手段２，３間の針糸経路を屈曲し
て増大し、天秤ｌによる針糸Ｔの緊張時期には上記針糸
経路を屈曲しないように、天秤ｌと同期して回転するカ
ム体１５のカム面１５ａに対し、て揺動体１１の下方部
に設けた追従子１１ｂを機枠との間に張り渡したコイル
ばね１６の弾性力により圧接させる。なお、コイルばね
１３の強さは繰り出し体９による針糸経路の屈曲中に両
保持手段２，３が針糸Ｔを挾持したときの針糸Ｔの張力
よりも弱く設定し、コイルばね】６はコイルばね１３よ
りも強く設定する。The feeding body 9 includes a rocking body 11 which is fixed to the machine frame and rotatably supported at an intermediate position on a shaft lO, and a shaft lO at the upper part of the rocking body 11.
It is rotatably supported around an axis 12 parallel to O, and is always pressed against a protrusion 11a made of a rubber material fixed to the oscillator 11 by a coil spring 13 stretched between it and the oscillator 11. As shown in FIG.
Place related within a. As shown in FIG. 4, the feeding arm 14 has an upper end surface 14a tilted downward to the right to form a T-shape at the upper end, with the right corner serving as a thread hooking part 14b. Also, as shown in FIG.
During the relaxation period of the needle thread T, the needle thread path between the two holding means 2 and 3 is bent and increased, and during the tension period of the needle thread T by the thread take-up lever, the needle thread path is bent and increased in synchronization with the thread take-up so as not to bend the needle thread path. A follower 11b provided at the lower part of the rocking body 11 is brought into pressure contact with the cam surface 15a of the rotating cam body 15 by the elastic force of a coil spring 16 stretched between it and the machine frame. The strength of the coil spring 13 is set to be weaker than the tension of the needle thread T when both the holding means 2 and 3 clamp the needle thread T while the needle thread path is being bent by the feeding body 9. is set to be stronger than the coil spring 13.

ベーステンション１７は常に針糸Ｔに一定の通過抵抗を
与えるように糸巻と保持手段２との間に配置する。回転
体１８は繰り出し体９の作動に関連して針糸Ｔが糸巻か
ら繰り出されたときにその繰り出し量に比例して回転可
能に両保持手段２゜３間に配置する。The base tension 17 is disposed between the bobbin winding and the holding means 2 so as to always provide a constant passing resistance to the needle thread T. The rotating body 18 is disposed between the holding means 2 and 3 so as to be rotatable in proportion to the amount of needle thread T that is fed out from the bobbin winding in conjunction with the operation of the feeding body 9.

抵抗刊与装置としてのベーステンション１９はベーステ
ンション１７と同様のものである。The base tension 19 as a resistance imparting device is similar to the base tension 17.

電気回路の構成について 繰り出し検出装置２７は回転体１８が一定角度回転する
毎に１個のパルスを発生する。位置検出装置２８は主軸
に関連配置してあり、前の縫目結節が完了して天秤ｌが
下降し始めた主軸の回転角を検出してＨの位置信号を発
生するＡ部と、天秤ｌによる針糸弛緩時期の始まる直前
からその時期の終る直前までの回転角度範囲を検出して
Ｉ（の位置信号を発生するＢ部とを有する。カウンタ２
９は位置検出装置２８のＡ部からの位置信号によりリセ
ットし、繰り出し検出装置２７からのクロックパルスを
計数する。設定装置３０はダイアルにより設定するデジ
タル・スイッチからなり、−縫目形成に要する針糸Ｔの
長さく布の厚さ、針の振り幅、送りピッチ等の条件によ
り変化する）に対応して繰り出すべき針糸Ｔの長さを設
定するものであり、その設定長さに対応して異なるデジ
タルコードを発生する。このデジタルコードは繰り出し
量に比例しだ回転体１８の回転角度に対応する繰り出し
検出装置２７からクロックパルスの数に関連させである
。Concerning the configuration of the electric circuit, the feedout detection device 27 generates one pulse every time the rotating body 18 rotates by a certain angle. The position detection device 28 is arranged in relation to the main shaft, and includes a section A that detects the rotation angle of the main shaft when the previous stitch knotting is completed and the take-up lever 1 starts to descend, and generates a position signal H; and a section B that detects the rotation angle range from just before the start of the needle thread relaxation period to just before the end of that period and generates a position signal of I (counter 2).
9 is reset by a position signal from part A of the position detection device 28, and counts clock pulses from the feedout detection device 27. The setting device 30 consists of a digital switch set by a dial, and is fed out in accordance with conditions such as the length of the needle thread T required for stitch formation, the thickness of the fabric, the swing width of the needle, and the feed pitch. The length of the needle thread T to be used is set, and a different digital code is generated corresponding to the set length. This digital code is proportional to the amount of payout and is related to the number of clock pulses from the payout detection device 27 which corresponds to the rotation angle of the rotating body 18.

比較回路８１はカウンタ２９と設定装置３ｏと”の出力
値を比較し、双方が一致するときＨの一致信号を発生す
る。作動回路８２．８８はＨの信号を受けて電磁石４．
　５＝を社を励磁するように開路し、低レベル（以下り
とする）の信号を受けて電磁石４，５Ｆ÷半を消磁する
ように閉路する。The comparator circuit 81 compares the output values of the counter 29 and the setting device 3o, and generates an H match signal when they match.The operating circuits 82 and 88 receive the H signal and operate the electromagnets 4 and 4.
5= is opened so as to excite the magnets, and closed so as to demagnetize the electromagnets 4 and 5F÷half in response to a low level (hereinafter referred to as "lower level") signal.

フリップフロップＦ　Ｆは位置検出装置２８のＡ部から
の位置信号によりリセットサれてＱ端子出力をＬとし、
比較回路３１からの一致信号によりＱ端子出力なＬから
Ｈに反転する。The flip-flop F is reset by the position signal from the A section of the position detection device 28, and the Q terminal output is set to L.
The match signal from the comparison circuit 31 inverts the Q terminal output from L to H.

なお、■はインバータである。Note that ■ is an inverter.

作用について ミシンを駆動すると、天秤ｌが保持手段３と針又は縫目
との間の針糸Ｔを緊張させるように上昇した後に弛緩さ
せるように下降し、それらを繰返す。また、天秤ｌによ
る上記の針糸弛緩期間中に繰り出し体９の揺動体１１が
コイルばね１６の作用力によりカム体１５に連動して第
１図の時計方向に往動すると共に反時計方向に復帰する
。Regarding operation, when the sewing machine is driven, the thread take-up 1 rises to tension the needle thread T between the holding means 3 and the needle or stitch, and then descends to relax it, and this process is repeated. Further, during the above-mentioned needle thread relaxation period by the thread take-up l, the swinging body 11 of the feeding body 9 moves clockwise in FIG. Return.

揺動体１１が往動すると繰り出し腕１４もコイルばね１
３の弾性力により揺動体１１と一体となって移動し、第
４，５図の（ｂ）のように開口６３間において針糸Ｔを
屈曲し、保持手段２，３間の針糸経路を増大する。なお
、この期間は位置検出装置２８のＡ部の出力によりＦ　
Ｆがリセノトサれていると共に、Ｂ部の出、力がＨであ
るから、一方の電磁石４＝母吐が消磁し他方の電磁石５
が励磁しこれにより供給源側の保持手段２芒母母は針糸
Ｔを解放し、繰り出し側の保持手段３は針糸Ｔを通過不
可能に挾持するので、揺動体（繰り出し体９）１１が往
動するに従って上記経路の増加に相当する長さの針糸Ｔ
が糸巻から保持手段２，８間に繰り出される。When the rocking body 11 moves forward, the extending arm 14 also releases the coil spring 1.
It moves together with the oscillating body 11 due to the elastic force of 3, bends the needle thread T between the openings 63 as shown in FIGS. increase Note that during this period, the output from section A of the position detection device 28 causes
Since F is reset and the output force of part B is H, one electromagnet 4 = main discharge is demagnetized and the other electromagnet 5
is excited, and as a result, the holding means 2 on the supply source side releases the needle thread T, and the holding means 3 on the feeding side clamps the needle thread T so that it cannot pass through. As the needle thread T moves forward, the length of the needle thread T corresponds to the increase in the above path.
is fed out from the spool between the holding means 2 and 8.

上記作用により針糸Ｔが糸巻から繰り出されると、回転
体１８が第１図の反時計方向に回転し、これにより繰り
出し検出装置２７からその回転角度に比例しだ数のクロ
ックパルスが発生する。このクロックパルスはカウンタ
２９で計数され、その計数値が比較回路３１の一方の入
力部に入力される。カウンタ２９の計数値が設定装置８
０の出力に一致すると比較回路８１かもＨの一致信号を
出力し、これによりＦ　ＦのＱ端子出力がＬからＨに反
転するので、電磁石４芒≠ヰが励磁して保持手段２Ｆ欅
遥が針糸Ｔを通過不可能に挾持し、糸巻から針糸Ｔが繰
り出されるのを阻止する。このとき他方の保持手段３は
位置検出装置２８の出力が変化しないから引き続き針糸
Ｔを挾持している。When the needle thread T is paid out from the bobbin spool by the above action, the rotating body 18 rotates counterclockwise in FIG. 1, thereby causing the payout detection device 27 to generate a number of clock pulses proportional to the rotation angle. This clock pulse is counted by a counter 29, and the counted value is inputted to one input section of a comparator circuit 31. The count value of the counter 29 is set by the setting device 8
When the output matches the output of 0, the comparator circuit 81 also outputs a match signal of H, which inverts the Q terminal output of FF from L to H, so the 4 electromagnets are energized and the holding means 2F, Haruka Keyaki, is energized. The needle thread T is held in such a way that it cannot pass through, and the needle thread T is prevented from being unwound from the bobbin winding. At this time, the other holding means 3 continues to hold the needle thread T since the output of the position detection device 28 does not change.

従って、設定装置３０で設定した長さの針糸Ｔが糸巻か
ら繰り出された後には、針糸Ｔが両保持手段２．貼−半
毒によって通過不可能に挾持されるので、もしこれが揺
動体１１の往動の途中であれば、その後の揺動体１１の
往動時には保持手段２゜８間の針糸Ｔの張力によりコイ
ルはね１３が引き伸ばされて繰り出し腕１４はその位置
に留り、針糸′ｒの繰り出しは終る。Therefore, after the needle thread T of the length set by the setting device 30 is let out from the bobbin spool, the needle thread T is moved to both the holding means 2. Since it is held in such a way that it cannot be passed by the adhesive, if this is in the middle of the forward movement of the rocking body 11, the tension of the needle thread T between the holding means 2°8 will cause the rocking body 11 to move forward. The coil spring 13 is stretched, the feeding arm 14 remains in that position, and the feeding of the needle thread 'r is completed.

次に、天秤ｌによる針糸Ｔの緊張時期の開始直前からそ
の時期の終了直前までの期間は、位置検出装置２８０Ｂ
部の出力がＬになり電磁石５が消磁するので、保持手段
３が針糸Ｔを解放する。これにより両保持手段間に繰り
出されだ針糸が、この期間に天秤ｌの上昇に伴なって天
秤側に引き出され、保持手段２及び縫目間の針糸Ｔが張
られると共に、これにより縫目が締められて結節する。Next, during the period from just before the tension period of the needle thread T by the thread take-up l to just before the end of that period, the position detection device 280B
Since the output of the section becomes L and the electromagnet 5 is demagnetized, the holding means 3 releases the needle thread T. As a result, the needle thread that has been let out between the two holding means is pulled out to the side of the thread take-up as the thread take-up 1 rises during this period, and the holding means 2 and the needle thread T between the stitches are tensioned. Eyes tighten and knot.

以後天秤ｌが一往復動する毎に上記作用を繰返す。Thereafter, the above operation is repeated every time the balance l makes one reciprocal movement.

なお、本実施例では一針毎の縫目結節に要する針糸の長
さに関する基礎データをデジタル・スイッチの手動操作
により設定するものを示したが、針振りの調節手段や布
送りの調節手段の設定位置を適宜な検出手段により検出
したデータ又は針振り機構や布送り機構の運動量を検出
したデータにより、予め記憶された糸量データを記憶装
置から読み出し、このデータを繰り出し長さの基礎デー
タとするか、又は上記検出データに基き演算して求めた
データを繰り出し長さの基礎データとじて比較回路３１
に入力してもよいし、記憶装置に記憶したデータに基い
て針振り機構や布送り機構を作動する型式のミシンにお
いて、その記憶データにより予め記憶された糸量データ
を単に読み出すか、又はその記憶データから演算して求
めたデータを繰り出し長さの基礎データとして比較回路
３１に入力するようにしてもよい。更に、針振りと布送
りに関するデータの他に、鞘厚による布押え足の位置の
変化をポテンショメータで検出する鞘厚検出装置の検出
データや、布の織糸、織方等の種類に対応して予め実験
によって求めたデータを複合して繰り出し量を設定する
ようにしてもよい。In this example, basic data regarding the length of needle thread required for tying each stitch is set by manual operation of a digital switch. The pre-stored yarn amount data is read out from the storage device based on the data detected by the set position of the machine using an appropriate detection means or the data detected by the momentum of the needle swing mechanism or cloth feed mechanism, and this data is used as the basic data for the unreeling length. Or, the comparator circuit 31 uses the data calculated based on the detected data as the basic data of the feeding length.
Alternatively, in a type of sewing machine that operates the needle swing mechanism or cloth feed mechanism based on the data stored in the storage device, the thread amount data stored in advance may be simply read out or Data calculated from the stored data may be input to the comparator circuit 31 as basic data of the feeding length. Furthermore, in addition to data related to needle swing and fabric feed, the system also supports detection data from a sheath thickness detection device that uses a potentiometer to detect changes in the position of the presser foot due to sheath thickness, as well as types of fabric such as yarn and weaving method. The feeding amount may be set by combining data obtained through experiments in advance.

本実施例では、カム体１５に連動して往復動する繰り出
し体９により針糸Ｔを糸巻から保持手段２．３間に繰り
出すと共に、常には保持手段２を不作用、保持手段３を
作用とし、必要糸量が繰り出されること（一致信号）に
関連して保持手段２を作用し、位置検出装置２８の８部
の位置信号に関連して保持手段３を不作用にし、この保
持手段３の不作用時期に前記の繰り出された針糸量な天
秤ｌの上昇によって保持手段２，３間から引き出すもの
を示しだが、たとえば特願昭５７−８２７１２号の明細
書及び図面に記載の第一実施例のように、回動する繰り
出し体を本願の繰り出し体９に代えて両保持手段間に配
置すると共に、比較回路３１からの一致信号に関連して
保持手段２を作用にすると同時に保持手段３を不作用と
なるように制御回路に関連させてもよい。In this embodiment, the needle thread T is fed out from the bobbin between the holding means 2 and 3 by the feeding body 9 which reciprocates in conjunction with the cam body 15, and the holding means 2 is always inactive and the holding means 3 is in operation. , the holding means 2 is actuated in relation to the required yarn amount being paid out (coincidence signal), and the holding means 3 is made inactive in relation to the position signal of the 8 parts of the position detection device 28, and the holding means 3 is activated. The above-mentioned needle thread is drawn out from between the holding means 2 and 3 by raising the thread take-up during the non-working period, but for example, the first embodiment described in the specification and drawings of Japanese Patent Application No. 57-82712 is shown. As in the example, a rotatable feeding body is placed between the two holding means in place of the feeding body 9 of the present application, and at the same time the holding means 2 is put into action in response to the coincidence signal from the comparison circuit 31. may be associated with the control circuit so as to have no effect.

以上のようにこの発明は、作用により針糸を通過不可能
に挾持し不作用により針糸な通過可能に解放するように
相対的に針糸供給方向手前の第一保持手段と先方の第二
保持手段及び両保持手段間の針糸経路を天秤による針糸
弛緩時期に増大し減少させるように作用する繰り出し体
と、針糸の繰り出しに連動して回転する回転体の回転角
を検知する検出装置により、−縫目形成毎に繰り出され
た糸量を検知し、−それが設定量に達したとき第一保持
手段を作用して次の縫目形成まで針糸の繰り出しを阻止
する型式の針糸供給装置において、繰り出し検出装置の
回転体を繰り出し体による両保持手段間の針糸経路の長
さの増加に比例して回転するように両保持手段間の針糸
経路上に配置したから、繰り出し体によって両保持手段
間に繰り込まれた針糸長さを確実に検知し、−縫目形成
毎に必要糸量を正確に供給することができ、先締りのよ
い縫目が得られる効果がある。As described above, in the present invention, the first holding means at the front in the needle thread supply direction and the second holding means at the front are arranged so that the needle thread is held between the needle threads so as not to be able to pass through the action and the needle thread is released so that the needle threads can pass through the non-action. A holding means and a feeding body that acts to increase and decrease the needle thread path between both holding means when the needle thread is relaxed by a balance, and a detection device that detects the rotation angle of a rotating body that rotates in conjunction with the feeding of the needle thread. The device detects the amount of thread being let out each time a stitch is formed, and when the amount reaches a set amount, the first holding means is activated to prevent the needle thread from being let out until the next stitch is formed. In the needle thread supply device, the rotating body of the feed-out detection device is arranged on the needle thread path between both holding means so as to rotate in proportion to the increase in the length of the needle thread path between both holding means by the feeding body. The length of the needle thread fed in between the two holding means by the feeding body can be reliably detected, and the required amount of thread can be accurately supplied each time a stitch is formed, resulting in a stitch with a good tightness. effective.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は要部の針視図、第２図は電気回路のブロック図
、第３図はタイムチャート、第４．５図は作用説明図で
ある。 特許出願人の名称 東京重機工業株式会社 ツ４図 体）　　　　　　　　　　　（い ンＳ肥− （仇）　　　　　　　　　（し）FIG. 1 is a needle perspective view of the main parts, FIG. 2 is a block diagram of the electric circuit, FIG. 3 is a time chart, and FIG. 4.5 is an explanatory diagram of the operation. Patent applicant's name: Tokyo Heavy Equipment Industry Co., Ltd.

Claims (1)

【特許請求の範囲】 天秤と針糸供給源との間の針糸経路上において互いに針
糸供給方向の先方と手前に離隔して配置し、作用により
針糸を通過不可能とし不作用により針糸を通過可能とす
る第一、第二保持手段２゜３と、 画−保持手段間の針糸経路上に配置し、両保持手段間の
針糸経路を変更してその経路の長さを天秤゛による側糸
緊張時期以外の時期に増大した後に天秤による針糸の最
大緊張時までに最短とするように、天秤に同期して作動
する繰り出し体９と、針糸供給方向において繰り出し体
よりも手前の第−保持手段及び先方の第二保持手段間の
針糸に係合し、繰り出し体による両保持手段間の針糸経
路の長゛さの増加に比例して回動する回転体１８をもち
、その回動角度に対応し電気的に異なる糸量検知信号を
発生する繰り出し検出装置２７と、主軸に関連配置し天
秤による針糸弛緩時期に対応する主軸の特定回転角を検
出して位置信号を発生する位置検出装置２８と、 異なる縫い条件に対応して一針の縫目形成に要する針糸
の長さに対応する設定信号を発生可能にした設定装置３
０と、 糸量検知信号と設定信号とを比較して一致するとき一致
信号を発生する比較回路をもち、常には第一保持手段を
不作用にし一致信号に関連して作用し且つその後の位置
信号に関連して不作用とすると共に、常には第二保持手
段を作用し一致信号又はその後の位置信号に関連して不
作用にした後に天秤による針糸の緊張時期の開始前に作
用とするように制御する制御回路、 とを備えたミシンの針糸供給装置。[Scope of Claims] The thread take-up lever and the needle thread supply source are arranged so as to be spaced apart from each other in the front and front of the needle thread supply direction on the needle thread path, so that the needle thread cannot pass through due to action and the needle thread cannot pass through due to non-action. The first and second holding means 2゜3 that allow the thread to pass through are arranged on the needle thread path between the image and the holding means, and the length of the path is changed by changing the needle thread path between both holding means. A feeding body 9 that operates in synchronization with the thread take-up, and a feed-out body 9 that operates in synchronization with the thread take-up so that the tension of the needle thread increases at a time other than the time when the side thread tension is increased by the thread take-up and reaches its maximum tension by the thread take-up, and A rotating body 18 that engages with the needle thread between the first holding means at the front and the second holding means at the front and rotates in proportion to the increase in the length of the needle thread path between the two holding means by the feeding body. It has a feed-out detection device 27 that electrically generates different thread amount detection signals corresponding to the rotation angle, and a feed-out detection device 27 that is arranged in relation to the main shaft and detects a specific rotation angle of the main shaft that corresponds to the time when the needle thread is relaxed by the thread take-up. A position detection device 28 that generates a position signal, and a setting device 3 that can generate a setting signal corresponding to the length of needle thread required to form one stitch in response to different sewing conditions.
0, and a comparison circuit that compares the yarn amount detection signal and the set signal and generates a match signal when they match, and normally makes the first holding means inactive and acts in relation to the match signal and controls the subsequent position. It is inactive in relation to the signal and the second holding means is always activated and inactive in relation to the coincidence signal or the subsequent position signal and before the start of the tensioning period of the needle thread by the thread take-up. A needle thread feeding device for a sewing machine, comprising: a control circuit for controlling the needle thread feeding device;