JPH0328875Y2 - - Google Patents
Info
- Publication number
- JPH0328875Y2 JPH0328875Y2 JP1985123172U JP12317285U JPH0328875Y2 JP H0328875 Y2 JPH0328875 Y2 JP H0328875Y2 JP 1985123172 U JP1985123172 U JP 1985123172U JP 12317285 U JP12317285 U JP 12317285U JP H0328875 Y2 JPH0328875 Y2 JP H0328875Y2
- Authority
- JP
- Japan
- Prior art keywords
- needle thread
- thread
- holding means
- needle
- signal
- 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.)
- Expired
Links
- 238000009958 sewing Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 21
- 239000011295 pitch Substances 0.000 description 6
- 239000004744 fabric Substances 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 needle swing width Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、一縫目形成毎に必要な長さの針糸
を糸巻から積極的に繰出して供給するようにした
ミシンの針糸供給装置に関し、特に、繰出し時期
以外で針糸が糸巻から繰出されたときに警報を発
するようにしたものである。[Detailed description of the invention] [Field of industrial application] This invention is a needle thread supply device for a sewing machine that actively feeds out and supplies the required length of needle thread from a bobbin winder each time one stitch is formed. In particular, when the needle thread is paid out from the bobbin at a time other than the time when the needle thread is paid out, an alarm is issued.
〔従来技術〕
針糸を挾持、解放可能とした二箇の保持手段
と、両保持手段間の針糸経路上に配置し天秤に同
期して作動する繰出し体とにより、、天秤による
針糸緊張時期以外の時期に供給源側の保持手段の
みを開いた状態で両保持手段間の針糸経路を増大
して針糸を供給源から繰出し、予定針糸量を繰出
された後は供給源側の保持手段を閉じてその後の
繰出しを阻止すると共に、天秤側の保持手段を開
き、繰出した針糸を次の天秤の上昇に伴ない両保
持手段から引出すようにした針糸供給装置では、
針糸が保持手段から外れていると正確な繰出し制
御が困難になると共に、特に針糸が繰出し体の作
用により糸巻から両保持手段間に予定長さ繰出さ
れた後に、天秤の作用によりその繰出された針糸
を両保持手段間から引上げられるため、針糸が供
給源側の保持手段から外れていると、繰出し体に
より針糸が予定長さ繰出された後に更に天秤の作
用によつて繰出れてしまい、この状態のまま縫製
すると糸締まりの悪い縫目が形成されて商品価値
のある縫製品が得られず、被縫物が無駄に消費さ
れる欠点があつた。[Prior art] Two holding means capable of holding and releasing the needle thread, and a feeding body disposed on the needle thread path between the two holding means and operating in synchronization with the thread take-up, allow the thread take-up to tension the needle thread. At any other time, with only the holding means on the supply source side open, the needle thread path between both holding means is increased and the needle thread is fed out from the supply source, and after the scheduled amount of needle thread has been fed out, the needle thread path on the supply source side is increased. In the needle thread supply device, the holding means is closed to prevent subsequent feeding, and the holding means on the thread take-up side is opened, and the fed needle thread is pulled out from both holding means as the thread take-up next rises.
If the needle thread is detached from the holding means, it becomes difficult to accurately control the feeding, and in particular, after the needle thread has been drawn out from the bobbin for a predetermined length between the two holding means by the action of the feeding body, the action of the thread take-up prevents the needle thread from being fed out. Since the needle thread that has been released is pulled up from between both holding means, if the needle thread is detached from the holding means on the supply source side, the needle thread will be paid out by the action of the thread take-up again after the needle thread has been paid out to a predetermined length by the feeding unit. If sewing is carried out in this state, stitches with poor thread tightness will be formed, making it impossible to obtain a sewn product with commercial value, and the sewing material will be wasted.
この考案は、針糸が供給源側の保持手段に正し
く掛け渡されていない場合には、天秤による針糸
緊張時期に針糸が供給源から繰出されることに着
目し、この異常繰出しの検出により警報装置を作
用して上記欠点を解消することを目的とする。 This invention focuses on the fact that if the needle thread is not correctly wrapped around the holding means on the supply source side, the needle thread will be paid out from the supply source when the needle thread is tensioned by the thread take-up, and this abnormal delivery can be detected. The purpose of this invention is to eliminate the above-mentioned drawbacks by using an alarm system.
以下この考案の実施例を図面により説明する。
機械部の構成について
ミシン１は駆動源に連動して回転する主軸（図
示せず）と、針糸Ｔをもつ針２を下端に固定し主
軸に連動して上下動する針棒３と、針糸供給源と
しての糸巻４と針２との間の針糸Ｔを支持し針糸
Ｔを緊張、弛緩するように主軸に連動して二位置
間を往復動する天秤５とを備えた公知のものであ
り、主軸の回転角に対する針棒３と天秤５との関
係は第５図に示したとおりである。 Examples of this invention will be described below with reference to the drawings.
About the configuration of the mechanical part The sewing machine 1 has a main shaft (not shown) that rotates in conjunction with a drive source, a needle bar 3 that fixes a needle 2 with a needle thread T at its lower end and moves up and down in conjunction with the main shaft, and a needle. A known thread take-up is provided with a thread take-up 5 which supports the needle thread T between the thread spool 4 and the needle 2 as a thread supply source and reciprocates between two positions in conjunction with the main shaft to tension and relax the needle thread T. The relationship between the needle bar 3 and the thread take-up lever 5 with respect to the rotation angle of the main shaft is as shown in FIG.
第一保持手段６及び第二保持手段７は、天秤５
と糸巻４との間の針糸経路上において、糸巻４か
ら天秤５に向う針糸供給方向の先方と手前に離隔
して配置し、それぞれが電磁石（第一ソレノイ
ド）８及び電磁石（第二ソレノイド）９と、これ
らの励磁により針糸Ｔを移動不可能に挟持し非励
磁により針糸Ｔを移動可能に解放する一対の保持
板１０及び１１とからなる。 The first holding means 6 and the second holding means 7 are connected to the balance 5
On the needle thread path between the thread spool 4 and the thread take-up 4, they are arranged at a distance from each other at the front and the front in the needle thread supply direction from the thread spool 4 to the thread take-up lever 5, and each has an electromagnet (first solenoid) 8 and an electromagnet (second solenoid). ) 9, and a pair of holding plates 10 and 11 which immovably clamp the needle thread T when energized and movably release the needle thread T when de-energized.
繰出し体１２は主軸に連動して回動する偏心カ
ム１３に連動して軸１４を中心に一定揺動可能と
し、その自由端を両保持手段６，７間の針糸経路
に関連配置して、第５図のように針２がベツド面
よりも下方に位置している時期に両保持手段６，
７間の針糸経路を増大すると共に、天秤５による
針糸緊張時までに最短とするように針２及び天秤
５の動きと関連させる。 The feeding body 12 is capable of constant rocking around a shaft 14 in conjunction with an eccentric cam 13 that rotates in conjunction with the main shaft, and its free end is arranged in relation to the needle thread path between both holding means 6 and 7. , when the needle 2 is located below the bed surface as shown in FIG.
The movement of the needle 2 and the thread take-up 5 is related to the movement of the needle 2 and the thread take-up 5 so as to increase the needle thread path between the needle thread take-up 7 and to make it as short as possible until the thread take-up is tensioned by the thread take-up 5.
また回転体１５は針糸Ｔがその経路に沿つて移
動したときにその移動距離に比例して回転可能に
両保持手段６，７間に配置してある。 Further, the rotating body 15 is arranged between the holding means 6 and 7 so as to be rotatable in proportion to the distance traveled by the needle thread T when it moves along its path.
電気回路について
第２図において、繰出し検出装置１６は回転体
１５が一定角度回転する毎に１箇のパルスを発生
する。第一位置検出装置１７は主軸又はそれに連
動する部体に関連配置してあり、針２がベツド面
よりも上方に位置する時期に対応する主軸の特定
回転角を検出して相対的に高レベル（以下Ｈとす
る）の信号を出力し、針２がベツド面より下方に
位置する時期に低レベル（以下Ｌとする）の信号
を出力する。第二位置検出装置１８は主軸又はそ
れに連動する部体に関連配置してあり、天秤５に
よる針糸Ｔの緊張時期に対応する主軸の回転角を
検出してＨ信号を出力する。カウンター１９は第
一位置検出装置１７の信号の立下りにより作用す
るタイマーMS1の信号の立下りでリセツトし、繰
出し検出装置１６からのパルスを計数する。 About the electric circuit In FIG. 2, the feeding detection device 16 generates one pulse every time the rotating body 15 rotates by a certain angle. The first position detection device 17 is arranged in relation to the main shaft or a part linked thereto, and detects a specific rotation angle of the main shaft corresponding to the time when the needle 2 is located above the bed surface, and detects a relatively high level. (hereinafter referred to as H) is output, and when the needle 2 is located below the bed surface, a low level signal (hereinafter referred to as L) is output. The second position detection device 18 is disposed in relation to the main shaft or a part linked thereto, detects the rotation angle of the main shaft corresponding to the tensioning period of the needle thread T by the thread take-up 5, and outputs an H signal. The counter 19 is reset at the fall of the signal of the timer MS1 , which is activated by the fall of the signal of the first position detecting device 17, and counts the pulses from the feed-out detecting device 16.
第三位置検出装置３０は針２がミシンベツド平
面に突刺る直前からベツド平面より抜け上る直前
までの主軸の特定回転角を検出してＨの信号を発
生する。フリツプフロツプFF1はミシン１の始動
スイツチ（図示せず）をオフすることによりセツ
トし、オンすることによりリセツトを解除し、第
三位置検出装置３０の出力の立上りに関連してＱ
出力をＬからＨに反転する。マルチプレクサ２０
はFF1からＬ信号を受けている時に第一設定装置
２１からの入力信号を出力し、またFF1からＨ信
号を受けている時に保持回路２２からの入力信号
を出力する。保持回路２２はタイマーMS2の出力
の立下りを取らえて減算装置２３からの入力信号
を取込むと同時に出力する。減算装置２３は第二
設定装置２４の出力信号の値ｅから後述する保持
回路２５の出力信号の値ｃを減算した値ｆを出力
する。第一設定装置２１、第二設定装置２４は一
縫目形成に要する針糸Ｔの長さに対応して繰出す
べき針糸Ｔの長さを設定するものであり、第一設
定装置２１は選択した縫い模様ごとに平均的な理
想の針糸繰出し長さに対応するデジタルコードを
発生し、第二設定装置２４は第４図により後述す
るように一縫目形成毎に針糸Ｔの設定長さに対応
してデジタルコードを発生する。そしてこのデジ
タルコードは繰出し量に比例した回転体１５の回
転角度に対応する繰出し検出装置１６からのパル
スの数に関連させてある。 The third position detection device 30 detects a specific rotation angle of the main shaft from just before the needle 2 sticks into the plane of the sewing machine bed to just before it comes off the bed plane and generates an H signal. The flip-flop FF 1 is set by turning off the start switch (not shown) of the sewing machine 1 and cancels the reset by turning it on.
Inverts the output from L to H. multiplexer 20
outputs the input signal from the first setting device 21 when receiving the L signal from FF 1 , and outputs the input signal from the holding circuit 22 when receiving the H signal from FF 1 . The holding circuit 22 captures the fall of the output of the timer MS 2 and outputs the input signal from the subtraction device 23 at the same time. The subtraction device 23 outputs a value f obtained by subtracting the value c of the output signal of the holding circuit 25, which will be described later, from the value e of the output signal of the second setting device 24. The first setting device 21 and the second setting device 24 are for setting the length of the needle thread T to be paid out in accordance with the length of the needle thread T required for forming one stitch. A digital code corresponding to the average ideal needle thread payout length is generated for each selected sewing pattern, and the second setting device 24 sets the needle thread T every time one stitch is formed, as will be described later with reference to FIG. A digital code is generated according to the length. This digital code is associated with the number of pulses from the payout detection device 16 corresponding to the rotation angle of the rotating body 15 which is proportional to the payout amount.
減算装置２６はカウンタ１９の出力信号の値ａ
からマルチプレクサ２０の出力信号の値ｂを減算
した値ｃを出力する。そして前記保持回路２５は
第三位置検出装置３０からの信号の立上りを取ら
えて上記の減算値ｃを取込むと同時に出力する。 The subtraction device 26 calculates the value a of the output signal of the counter 19.
The value c obtained by subtracting the value b of the output signal of the multiplexer 20 from the multiplexer 20 is output. The holding circuit 25 detects the rising edge of the signal from the third position detecting device 30 and outputs the subtracted value c at the same time.
比較回路２７はカウンタ１９とマルチプレクサ
２０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。FF2はタイマーMS1の信
号の立下りによつてリセツトされ、その時のＱ端
子出力をＬとし、比較回路２６からの一致信号に
よりＱ端子出力をＬからＨに反転する。 The comparison circuit 27 compares the output values of the counter 19 and the multiplexer 20, and when both match, the output value is H.
generates a match signal. FF 2 is reset by the fall of the signal of timer MS 1 , sets the Q terminal output at that time to L, and inverts the Q terminal output from L to H by the match signal from the comparison circuit 26.
作動回路２８，２９はFF2からＨ信号を受けて
対応する第一ソレノイド８、第二ソレノイド９を
励磁するように開路し、Ｌ信号を受けてそれらを
消磁するように閉路する。なお作動回路２８はそ
れが開路している場合に、第二位置検出装置１８
からＨのパワーダウン信号を受けた時（第二位置
検出装置１８にＬの信号が発生している時）はＬ
の信号を受けた時よりも第一ソレノイド８に小さ
な電流が供給されるようになつている。即ち作動
回路２８の構成の一例をアナログ回路で表わせば
第３図のようになる。ここでＰは比較機能を有す
る公知のオペアンプ、Tr1，Tr2，Tr3はトランジ
スタであり、FF2のＱ端子出力がＬのときはトラ
ンジスタTr2がオンしこれによつてトランジスタ
Tr1がオフするので第一ソレノイド８は消磁し、
FF2のＱ端子出力がＨのときはトランジスタTr2
がオフするのでトランジスタTr1がオンしこれに
より第一ソレノイド８は励磁する。またトランジ
スタTr2がオフしている時にＨのパワーダウン信
号を受けてトランジスタTr3がオンすると、オペ
アンプＰの基準電圧が低くなるので第一ソレノイ
ド８に供給される電流値が下り、これとは反対に
トランジスタTr3がＬ信号を受けてオフとなると
オペアンプＰの基準電圧が高くなるので第一ソレ
ノイド８に供給される電流値が高くなるように作
用する構成である。 The operating circuits 28 and 29 open when receiving the H signal from FF 2 to excite the corresponding first solenoid 8 and second solenoid 9, and close when receiving the L signal to demagnetize them. It should be noted that the actuation circuit 28 is connected to the second position detection device 18 when it is open.
When receiving a power down signal of H from (when an L signal is generated in the second position detection device 18),
A smaller current is supplied to the first solenoid 8 than when the signal is received. That is, an example of the configuration of the operating circuit 28 can be expressed as an analog circuit as shown in FIG. 3. Here, P is a known operational amplifier having a comparison function, and Tr 1 , Tr 2 , and Tr 3 are transistors. When the Q terminal output of FF 2 is L, transistor Tr 2 is turned on, and the transistor Tr 2 is turned on.
Since Tr 1 is turned off, the first solenoid 8 is demagnetized,
When the Q terminal output of FF 2 is H, the transistor Tr 2
Since the transistor Tr 1 is turned off, the transistor Tr 1 is turned on, and the first solenoid 8 is thereby excited. Furthermore, when transistor Tr 3 turns on in response to an H power-down signal while transistor Tr 2 is off, the reference voltage of operational amplifier P becomes lower, so the current value supplied to first solenoid 8 decreases. On the other hand, when the transistor Tr 3 receives the L signal and turns off, the reference voltage of the operational amplifier P increases, so that the current value supplied to the first solenoid 8 increases.
FF3はミシン停止中はＲ端子にＨの信号を受け
てＱ端子出力をＬとし、且つミシンの始動操作に
関連してＲ端子にＬの信号を受けてリセツトを解
除し、アンドゲート回路ＧからＨの信号を受けた
ときＱ端子出力をＨとする。警報装置４７はブザ
ー、ランプ等であつて、FF3のＱ端子出力がＨに
なることによりタイマーTMを介して一定時間、
音・光、表示等を発生する。 When the sewing machine is stopped, FF 3 receives an H signal at the R terminal and sets the Q terminal output to L, and when the sewing machine starts, it receives an L signal at the R terminal and releases the reset, and the AND gate circuit G When receiving an H signal from the terminal, the Q terminal output is set to H. The alarm device 47 is a buzzer, a lamp, etc., and when the Q terminal output of FF 3 becomes H, the alarm is activated for a certain period of time via a timer TM.
Generates sounds, lights, displays, etc.
第２図における第二設定装置２４の詳細は第４
図のとおりである。ここで針棒３の振り幅に関す
る振り幅信号Ｙ、布の送りピツチに関する送り量
信号Ｘは、ROM、RAM等の記憶装置（図示せ
ず）から読み出された信号又はこれら信号に基い
て作動する公知の針振り調節器、送り調節器（図
示せず）の位置を検出した信号であり、これら信
号の検出時期は、第５図に示したように第三位置
検出装置３０の出力の立下り及び立上りに関連し
て検出され、送り量信号Ｘは振り幅信号Ｙを検出
するまで保持回路（図示せず）により保持され
る。 Details of the second setting device 24 in FIG.
As shown in the figure. Here, the amplitude signal Y related to the amplitude of the needle bar 3 and the feed amount signal X related to the feed pitch of the cloth are operated based on signals read from a storage device (not shown) such as ROM or RAM, or based on these signals. These signals are signals that detect the positions of a known needle swing adjuster and feed adjuster (not shown), and these signals are detected at the timing of the output of the third position detecting device 30 as shown in FIG. The feed amount signal X is detected in relation to the falling and rising edges, and is held by a holding circuit (not shown) until the amplitude signal Y is detected.
そしてこれらの各信号Ｘ，Ｙはそれぞれ二乗器
３１，３２にて処理された後に加算器３３によつ
て加算され、次の乗算器３４によつて送り量縫目
ピツチ係数設定スイツチ３５の出力ｍと乗算され
た後に並列配置したk′1乗算器３６及び平方根演
算器３７によつて処理され、前記平方根演算器３
７の出力はk′2乗算器３８を通して加算器３９に
送られ、またk′1乗算器３６の出力はそのまま加
算器３９に送られ、これらの加算データは加算器
４０に送られる。なお送り量係数設定スイツチ３
５は数ビツトのコードを有し、手操作により操作
態様に対応するデジタルコードを出力可能とす
る。 These signals X and Y are processed by squarers 31 and 32, respectively, and then added by an adder 33, and the next multiplier 34 outputs the output m of the feed amount stitch pitch coefficient setting switch 35. After being multiplied by
The output of 7 is sent to the adder 39 through the k' 2 multiplier 38, the output of the k' 1 multiplier 36 is sent as is to the adder 39, and the added data is sent to the adder 40. In addition, feed rate coefficient setting switch 3
5 has a code of several bits, and can output a digital code corresponding to the operation mode by manual operation.
ベツド上面からの布押え足（図示せず）の上昇
位置に対応する布厚信号Ｄは送り量信号Ｘの検出
と同じタイミングで検出されると共に、乗算器４
１によつて係数用カウンタ４２の出力k3と乗算さ
れた後に加算器４０によつて前記加算器３９の出
力データと加算され、更にその出力をk4加算器４
３を通して処理される。 The material thickness signal D corresponding to the raised position of the presser foot (not shown) from the upper surface of the bed is detected at the same timing as the feed amount signal X, and is also detected by the multiplier 4.
The output data of the coefficient counter 42 is multiplied by the output k3 of the coefficient counter 42 by the adder 40, and then added to the output data of the adder 39 by the adder 40 .
Processed through 3.
従つてk4加算器４３の出力、すなわち針糸Ｔの
予定繰出し量はk1′m＝k1，k′2√＝k2，X2＋
Y2＝Ｐとすれば＝k1P2＋k2P＋k3D＋k4とＰの
二次式で表わされる。繰出し検出量演算器４４は
k4加算器４３の出力を針糸Ｔの予定繰出し長さに
比例した回転体１５の回転角に対応する繰出し検
出装置１６の発生パルス数に換算し、これにより
針糸Ｔの予定繰出し長さに対応するデジタルコー
ドを発生させる。 Therefore, the output of the k 4 adder 43, that is, the planned payout amount of the needle thread T is k 1 ′m=k 1 , k′ 2 √=k 2 , X 2 +
If Y 2 =P, it is expressed by a quadratic equation of =k 1 P 2 +k 2 P+k 3 D+k 4 and P. The feeding detection amount calculator 44 is
The output of the k 4 adder 43 is converted into the number of pulses generated by the feed-out detection device 16 corresponding to the rotation angle of the rotating body 15 which is proportional to the planned pay-out length of the needle thread T, and thereby the planned pay-out length of the needle thread T is calculated. generates a digital code corresponding to
前記係数用カウンタ４２は、第６図のフローチ
ヤートに示したようにアツプ・ダウンスイツチ４
５，４６の操作に関連して出力の値k3を初期値
「１」を中心とする所定の範囲内で段階的に変更
可能であり、且つＲ端子にＨの信号を受けてリセ
ツトし、これにより出力が初期値の「１」となる
ようになつていると共に、このカウンタ４２の出
力値k3に対応する数がミシン機枠の前面に設けた
表示窓（図示せず）に表示されるようになつてい
る。なお、模様切替信号Ｅは縫目模様の選択操作
に関連し、また電源入信号Ｆは電源投入時に関連
してそれぞれ一定時間発生するＨの信号である。 The coefficient counter 42 is connected to the up/down switch 4 as shown in the flowchart of FIG.
In connection with the operations of 5 and 46, the output value k3 can be changed stepwise within a predetermined range centered on the initial value "1", and is reset by receiving an H signal at the R terminal, As a result, the output becomes the initial value "1", and the number corresponding to the output value k3 of the counter 42 is displayed on a display window (not shown) provided on the front of the sewing machine frame. It is becoming more and more like this. The pattern switching signal E is related to the stitch pattern selection operation, and the power-on signal F is an H signal that is generated for a certain period of time in connection with power-on.
この考案は以上の構成であり、次にその作用を
説明する。 This invention has the above structure, and its operation will be explained next.
まず模様選択手段により縫い模様を選択すると
その選択模様に対応する固有の針糸の繰出し長さ
に対応する信号ｄが第一設定手段２１から出力す
る。次にミシンを始動操作するとFF1のリセツト
が解除されるがそのＱ端子出力はＬのままで第一
設定手段２１の出力ｄがマルチプレクサ２０を介
して比較回路２７及び減算装置２６に送られる。 First, when a sewing pattern is selected by the pattern selection means, the first setting means 21 outputs a signal d corresponding to a unique needle thread payout length corresponding to the selected pattern. Next, when the sewing machine is started, the reset of FF 1 is canceled, but the Q terminal output remains at L, and the output d of the first setting means 21 is sent to the comparison circuit 27 and the subtraction device 26 via the multiplexer 20.
一方、ミシン１が始動すると、天秤５が上死点
から下降して保持手段７よりも針側の針糸Ｔが弛
み始めるとき、タイマーMS1の信号の立下りに関
連してカウンタ１９がリセツトすると共に、FF2
がクリヤするので作動回路２８が閉じて第一ソレ
ノイド８が消磁し、保持手段６による針糸Ｔの挟
持を解放すると共に、作動回路２９を開いて第二
ソレノイド９を励磁し、保持手段７により針糸Ｔ
を通過不可能に挟持する。 On the other hand, when the sewing machine 1 is started and the thread take-up 5 descends from the top dead center and the needle thread T on the needle side of the holding means 7 begins to loosen, the counter 19 is reset in relation to the fall of the signal of the timer MS1 . Along with FF 2
is cleared, the operating circuit 28 closes and the first solenoid 8 is demagnetized, releasing the needle thread T from holding by the holding means 6. At the same time, the operating circuit 29 is opened to excite the second solenoid 9, and the holding means 7 demagnetizes the needle thread T. Needle thread T
be held in such a way that it cannot pass through.
また、この直後に繰出し体１２が軸１４を中心
に第１図の状態から反時計方向に往動し、両保持
手段６，７間の針糸Ｔを屈曲してその供給経路を
次第に増大するので、増大した経路に相当する長
さの針糸Ｔが糸巻４から繰出される。 Immediately after this, the feeding body 12 moves counterclockwise around the shaft 14 from the state shown in FIG. Therefore, the needle thread T having a length corresponding to the increased path is let out from the bobbin 4.
上記の作用により針糸Ｔが繰出されると、回転
体１５が第１図時計方向に回転され、その回転角
度に比例した数のパルスが繰出し検出装置１６か
ら発生する。このパルスはカウンタ１９で計数さ
れ、その計数値が比較回路２７、減算装置２６に
送られる。そこで、カウンタ１９の計数値が前記
第一設定装置２１の出力の値ｄと一致すると比較
回路２７からＨの一致信号を出力し、これにより
FF2がセツトしてＱ端子出力がＬからＨに反転す
るので、第一ソレノイド８が励磁して保持手段６
により針糸Ｔを通過不可能に挟持しその後の針糸
Ｔの繰出しを阻止すると共に、第二ソレノイド９
が消磁して保持手段７により針糸Ｔを通過可能に
解放する。 When the needle thread T is paid out by the above action, the rotating body 15 is rotated clockwise in FIG. 1, and a number of pulses proportional to the rotation angle are generated from the feeding detection device 16. These pulses are counted by a counter 19, and the counted value is sent to a comparison circuit 27 and a subtraction device 26. Therefore, when the count value of the counter 19 matches the value d of the output of the first setting device 21, the comparison circuit 27 outputs a matching signal of H.
Since FF 2 is set and the Q terminal output is reversed from L to H, the first solenoid 8 is energized and the holding means 6
The second solenoid 9 holds the needle thread T so that it cannot pass through and prevents the needle thread T from being fed out thereafter.
is demagnetized and the holding means 7 releases the needle thread T so that it can pass therethrough.
なお、繰出し体１２の往動が終る以前に比較回
路２７から一致信号が発生し、保持手段６により
針糸Ｔが通過不可能に挟持されても、これと同時
に保持手段７が針糸Ｔの挟持を解放すると共に、
このとき天秤５が保持手段７よりも針２側の針糸
Ｔを弛緩しているので繰出し体１２がその後さら
に往動しても保持手段７よりも針２側に弛んでい
る針糸Ｔが保持手段７を通過して両保持手段６，
７間に引込まれるだけ、針糸Ｔが強く張られた
り、それによつて糸巻５から繰出されたりはしな
い。 Note that even if a matching signal is generated from the comparison circuit 27 before the forward movement of the feeding body 12 is finished, and the needle thread T is held by the holding means 6 so that it cannot pass through, the holding means 7 simultaneously Along with releasing the pinch,
At this time, the thread take-up 5 loosens the needle thread T closer to the needle 2 than the holding means 7, so even if the feeding body 12 moves further forward thereafter, the loose needle thread T closer to the needle 2 than the holding means 7 Passing through the holding means 7, both holding means 6,
7, the needle thread T is not strongly tensioned or drawn out from the bobbin 5.
次に天秤５が下死点から上昇を始めると針２及
び保持手段６間の針糸Ｔが次第に引上げられて縫
目が結節される。またこの第一針目の縫目を形成
している間に送り量信号Ｘ、布厚信号Ｄ及び振り
幅信号Ｙが順次に検出され、これにより次の縫目
形成時に消費される針糸Ｔの長さが演算され、そ
の値ｅが第二設定装置２４から出力される。そし
て第三位置検出装置３０の信号の立上りにより
FF1はセツトされそのＱ端子出力がＨに反転する
ので、上記第二設定装置２４の信号はFF1がセツ
トしてから一定時間経過後に、即ちタイマーMS2
出力の立下りに関連してマルチプレクサ２０を介
して比較回路２７に送られる。 Next, when the thread take-up 5 starts to rise from the bottom dead center, the needle thread T between the needle 2 and the holding means 6 is gradually pulled up and the stitch is knotted. Also, while forming this first stitch, the feed amount signal The length is calculated and the value e is output from the second setting device 24. Then, due to the rise of the signal from the third position detection device 30,
Since FF 1 is set and its Q terminal output is inverted to H, the signal of the second setting device 24 is output after a certain period of time has passed since FF 1 is set, that is, timer MS 2
It is sent to the comparator circuit 27 via the multiplexer 20 in connection with the fall of the output.
従つて第一針目は第一設定装置２１の信号によ
り針糸繰出し量が決定されるが、第二針目からは
次の縫目形成に係る送りピツチ、針振り幅及び布
厚を複合して算出した第二設定装置２４の信号に
より針糸繰出し量が決定される。そしてカウンタ
１９の出力の値とマルチプレクサ２０の出力の値
が一致すれば、比較回路２７から一致信号が発生
し、以下前述と同様の作用を繰返して、一縫目形
成毎に必要な長さの針糸Ｔを予め糸巻４から両保
持手段６，７間に繰出す。 Therefore, for the first stitch, the needle thread payout amount is determined by the signal from the first setting device 21, but from the second stitch onward, it is calculated by combining the feed pitch, needle swing width, and fabric thickness for forming the next stitch. The needle thread payout amount is determined by the signal from the second setting device 24. When the output value of the counter 19 and the output value of the multiplexer 20 match, a match signal is generated from the comparison circuit 27, and the same operation as described above is repeated to obtain the required length for each stitch formation. The needle thread T is previously fed out from the bobbin 4 between the holding means 6 and 7.
以上の作用は第一設定装置２１及び第二設定装
置２４の信号に対応する長さの針糸Ｔが一縫目形
成毎に正確に縫出された場合であるが、比較回路
２７より一致信号が発生した後からカウンタ１９
がリセツトされるまでの間に針糸Ｔが保持手段６
よりも針糸供給方向手前から先方に繰出された場
合には、その過剰繰出し量が減算装置２６によつ
て算出され、その値ｃが次の位置検出装置１７の
信号の立上りにより保持回路２５から出力され
る。これによつて減算装置２３により第二設定装
置２４の出力値ｅから上記減算装置２６の出力値
ｃを減算した値ｆがマルチプレクサ２０を介して
比較回路２７の一方の入力部に入力される。そし
てその値にカウンタ１９の計数値が一致すると比
較回路２７から一致信号が発生し、以下上述と同
様の作用を繰返す。 The above operation is performed when the needle thread T having the length corresponding to the signals from the first setting device 21 and the second setting device 24 is sewn out accurately every time a stitch is formed. Counter 19 starts after
The needle thread T is held by the holding means 6 until it is reset.
When the needle thread is fed out from the front to the front in the needle thread supply direction, the amount of excess feed is calculated by the subtraction device 26, and the value c is sent from the holding circuit 25 at the next rise of the signal from the position detection device 17. Output. As a result, the value f obtained by subtracting the output value c of the subtraction device 26 from the output value e of the second setting device 24 by the subtraction device 23 is inputted to one input section of the comparison circuit 27 via the multiplexer 20. When the count value of the counter 19 matches this value, a match signal is generated from the comparison circuit 27, and the same operation as described above is repeated.
即ち、一縫目形成時に第一設定装置２１又は第
二設定装置２４によつて設定された針糸Ｔの繰出
し長さと、繰出し体１２により実際に両保持手段
６，７間に繰込まれた針糸Ｔの長さとが一致しな
かつた場合には、これら双方の差分だけ次の縫目
形成時に針糸繰出し長さが補正される。 That is, the length of the needle thread T set by the first setting device 21 or the second setting device 24 when forming one stitch, and the length of the needle thread T actually fed between the holding means 6 and 7 by the feeding body 12. If the lengths of the needle thread T do not match, the needle thread payout length is corrected by the difference between the two when forming the next stitch.
次に前述した第一ソレノイド８の励磁中におい
て、第二位置検出装置１８の出力がＬの時にはト
ランジスタTr3がオンしオペアンプＰの基準電圧
が後述の場合よりも相対的に低く第一ソレノイド
８の励磁電流が小さくなる。この状態のときには
繰出し体１２の作用によつて針糸Ｔが両保持手段
６，７に繰込まれない程度に針糸Ｔを挟持する力
が保持手段６に与えられ、また第二位置検出装置
１８の出力がＨの時にはトランジスタTr3がオフ
してオペアンプＰの基準電圧が上記の場合よりも
高くなり第一ソレノイド８の励磁電流が大きくな
るので、この状態のときには天秤５によつて針糸
Ｔが強く緊張されても両保持手段６，７間に針糸
Ｔが繰込まれない程度に針糸Ｔを挟持する力が保
持手段６に与えられる。 Next, during the excitation of the first solenoid 8 described above, when the output of the second position detection device 18 is L, the transistor Tr 3 is turned on, and the reference voltage of the operational amplifier P is relatively lower than that in the case described later. The excitation current becomes smaller. In this state, the action of the feeding body 12 applies a force to the holding means 6 to hold the needle thread T to such an extent that the needle thread T is not drawn into both holding means 6 and 7, and the second position detection device When the output of 18 is H, the transistor Tr 3 is turned off and the reference voltage of the operational amplifier P becomes higher than in the above case, and the excitation current of the first solenoid 8 increases. A force is applied to the holding means 6 to hold the needle thread T to such an extent that the needle thread T is not drawn in between the holding means 6 and 7 even if the thread T is strongly tensioned.
第二設定装置２４の出力の値ｅの演算の基礎と
なるk4加算器４３の出力は「＝k1P2＋k2P＋
k3D＋k4」であるから、送り量係数設定スイツチ
３５を操作しその出力の値ｍを適宜に変更すれ
ば、「P2」の係数「k1」と「k2」が変化するので
k4加算器４３の出力「」が変化し、これにより
比較回路２７の一方の入力部に入力される第二設
定装置２４の出力が変化する。なお送り量係数設
定スイツチ３５による調整は、送り又は針振り用
のステツピングモータへの入力信号を針糸繰出し
の演算式に入力させる型式のものにおいて、演算
式に入力される送りピツチと実際の送りピツチが
一致しない場合に各ミシン毎に行なうものであ
る。 The output of the k 4 adder 43, which is the basis for calculating the value e of the output of the second setting device 24, is ``=k 1 P 2 +k 2 P+
k 3 D + k 4 '', so if the feed amount coefficient setting switch 35 is operated and the output value m is changed appropriately, the coefficients ``k 1 '' and ``k 2 '' of ``P 2 '' will change.
The output ``'' of the k4 adder 43 changes, and thereby the output of the second setting device 24, which is input to one input of the comparison circuit 27, changes. Note that the adjustment by the feed amount coefficient setting switch 35 is performed when the input signal to the stepping motor for feeding or needle swing is input into the calculation formula for needle thread payout, and the adjustment by the feed rate coefficient setting switch 35 is based on the feed pitch input into the calculation formula and the actual feed pitch. This is done for each sewing machine when the feed pitches do not match.
アツプスイツチ４５を操作すると、上記k4加算
器４３の出力のうち布厚信号「Ｄ」の係数「k3」
の値が初期値「１」を中心として予め設定した範
囲内で段階的に大きくなり、またダウンスイツチ
４６を操作すると係数「k3」の値が段階的に小さ
くなり、これらによつても第二設定装置２４の出
力が変化するが、模様選択及び電源投入に関連し
て係数用カウンタ４２がリセツトし係数「k3」の
値が初期値「１」に戻る。なおこの調整は縫製時
にギヤザーやイセコミを布に与えたり縫目を上吊
りや下吊り状態にするために上下糸の糸締りバラ
ンスを意図的に変更する場合に適時に行なうもの
である。 When the up switch 45 is operated, the coefficient “k 3 ” of the cloth thickness signal “D” is output from the k 4 adder 43.
The value of ``k'' increases stepwise within a preset range centered on the initial value ``1'', and when the down switch 46 is operated, the value of the coefficient `` k3 '' decreases stepwise. Although the output of the second setting device 24 changes, the coefficient counter 42 is reset in connection with pattern selection and power-on, and the value of the coefficient "k 3 " returns to the initial value "1". This adjustment should be made at the appropriate time when the thread tension balance of the upper and lower threads is intentionally changed in order to give gears or irregularities to the fabric during sewing, or to make the seams hang upward or downward.
次に、保持手段６の両保持板１０間に針糸Ｔが
通つていないと繰出し体１２による針糸繰出し期
間以外でも天秤５による針糸Ｔの緊張に伴なつて
針糸Ｔが糸巻４から繰出されるが、ミシン回転時
はFF3のリセツトが解除されており、且つ天秤５
による針糸緊張期間中は第一位置検出装置１７の
出力がＨでゲートＧを開くから、針糸Ｔが繰出さ
れて回転体１５が回転すれば繰出し検出装置１６
に発生するパルスによりFF3セツトしタイマTM
を介して一定時間警報装置３０が作動する。 Next, if the needle thread T is not passed between both holding plates 10 of the holding means 6, the tension of the needle thread T by the thread take-up lever 5 will cause the needle thread T to be moved to the bobbin winder even outside the period when the needle thread is being fed out by the feeding body 12. However, when the sewing machine is rotating, FF 3 is reset and the thread take-up lever 5 is released.
During the needle thread tension period, the output of the first position detection device 17 is H and the gate G is opened.
FF3 is set by the pulse generated in the timer TM.
The alarm device 30 is activated for a certain period of time via.
以上のようにこの考案は、保持手段と、位置検
出装置と、繰出し体と、繰出し検出装置とをし
て、ミシン針がベツド上面よりも下方に位置する
時期に対応する主軸の特定回転角を検出して発生
される位置信号の発生に関連して供給源側の保持
手段を不作用とし天秤側の保持手段を作用し、繰
出し体に連動して針糸を供給源から両保持手段間
に繰出すと共に、予め設定した針糸量の繰出しに
関連して次の位置信号が発生するまで供給源側の
保持手段を作用して針糸の繰出しを阻止し且つ天
秤側の保持手段を不作用にして一縫目形成毎に設
定長さの針糸を予め供給源から繰出して天秤へ供
給するように関連させたミシンの針糸供給装置に
おいて、位置信号の非発生時期に針糸の繰出しが
検出されることに関連して表示、光、音等を発生
する警報装置を作用するように構成したから、糸
掛け不良等の異常がミシンを始動した直後に検出
でき、縫製作業時間や被縫物の無駄を省くことが
できる。 As described above, this invention uses a holding means, a position detection device, a feeding body, and a feeding detection device to detect a specific rotation angle of the main shaft corresponding to the time when the sewing machine needle is located below the top surface of the bed. In connection with the generation of the position signal detected and generated, the holding means on the supply source side is made inactive, the holding means on the balance side is activated, and the needle thread is moved from the supply source between the two holding means in conjunction with the feeding body. At the same time as the needle thread is paid out, the holding means on the supply source side is activated to prevent the needle thread from being paid out and the holding means on the thread take-up side is inactivated until the next position signal is generated in relation to the feeding of a preset amount of needle thread. In a needle thread supply device of a sewing machine, which is connected to a sewing machine so that a set length of needle thread is paid out in advance from a supply source and supplied to a thread take-up each time a stitch is formed, the needle thread is not paid out when a position signal is not generated. Since it is configured to activate an alarm device that generates a display, light, sound, etc. in connection with the detection, abnormalities such as poor threading can be detected immediately after starting the sewing machine, reducing the sewing work time and the material to be sewn. You can avoid wasting things.
本実施例では棒状の繰出し体１２がカム体１３
に連動して往復動するものを示したが、特願昭57
−82712号の第１実施例のように針糸経路に対向
する外周カム面を形成した繰出し体を回動するよ
うにしてもよい。 In this embodiment, the rod-shaped feeding body 12 is the cam body 13.
The figure shows one that moves back and forth in conjunction with the
As in the first embodiment of No.-82712, a feeding body having an outer peripheral cam surface facing the needle thread path may be rotated.
本実施例では二箇の保持手段を設定信号に基い
て制御するものを示したが、外周円上に針糸を巻
き掛けた円板又は針糸を挟んで対向配置したロー
ラーの一方を設定信号に基きステツピングモータ
を介して回動するようにしてもよい。 In this embodiment, the two holding means are controlled based on the setting signal, but one of the disks around which the needle thread is wound around the outer circumference or the rollers arranged facing each other across the needle thread is controlled based on the setting signal. It may also be rotated via a base stepping motor.
本実施例では第一設定装置２１と第二設定装置
２４とを設け、第一設定装置２１からは縫い模様
ごとに異なる平均的な理想の針糸繰出し長さに対
応するデジタルコードを発生するものとしたが、
総べてのものの模様において同一のデジタルコー
ドを発生するようにしてもよい。 In this embodiment, a first setting device 21 and a second setting device 24 are provided, and the first setting device 21 generates a digital code corresponding to the average ideal needle thread delivery length that varies for each sewing pattern. However,
The same digital code may be generated for all patterns.
本実施例では針糸の適正繰出し長さを、＝
k1・P2＋k2・Ｐ＋k3・Ｄ＋k4の演算式から求め
たものを示したが、＝k2・Ｐ＋k3・Ｄの演算式
で求めるようにしてもよい。 In this example, the appropriate needle thread payout length is =
Although the calculation formula k 1 ·P 2 +k 2 ·P+k 3 ·D+k 4 is shown, it may be calculated by the calculation formula =k 2 ·P+k 3 ·D.
第１図は要部の斜視図、第２図は電気回路のブ
ロツク図、第３図は第２図における作動回路２８
の詳細図、第４図は第２図における第二設定装置
２４の詳細を示したブロツク図、第５図はタイム
チヤート、第６図はアツプ・ダウンスイツチと係
数用カウンタの関係を示したフローチヤートであ
る。
Figure 1 is a perspective view of the main parts, Figure 2 is a block diagram of the electric circuit, and Figure 3 is the operating circuit 28 in Figure 2.
4 is a block diagram showing details of the second setting device 24 in FIG. 2, FIG. 5 is a time chart, and FIG. 6 is a flow chart showing the relationship between the up/down switch and the coefficient counter. It's a chat.
Claims (1)
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ように針糸に作用する二
個の保持手段６，７と、 主軸に関連配置しミシン針がベツド上面よりも
下方に位置する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１７
と、 両保持手段間の針糸経路上に配置し、両保持手
段間の針糸経路を周期的に一定量変更してその経
路長さを位置信号の発生期間中に増大した後に天
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出し体１２と、 供給源から両保持手段間に繰込まれた糸量を検
出し繰込まれた糸量に対応する糸量信号を発生す
る繰出し検出装置１６とをして、 位置信号の発生に関連して供給源側の保持手段
を不作用とし天秤側の保持手段を作用し、繰出し
体に連動して針糸を供給源から両保持手段間に繰
出すと共に、予め設定した針糸量の繰出しに関連
して次の位置信号が発生するまで供給源側の保持
手段を作用にして針糸の繰出しを阻止し且つ天秤
側の保持手段を不作用にして一縫目形成毎に設定
長さの針糸を予め供給源から繰出して天秤へ供給
するように関連させたミシンの針糸供給装置にお
いて、 繰出し検出装置と位置検出装置の出力を入力と
し位置信号を受けて開路し位置信号の消滅により
閉路し且つ開路中に糸量信号を受けたときとそれ
以外のときとでは異なる信号を発生するゲート回
路Ｇと、 位置信号の消滅時に糸量信号を受けたときのゲ
ート回路出力により一定時間作用するタイマー
（TM）と、 タイマーの作用と同期して作用し光又は音を発
生する警報装置４７、 とを備えたことを特徴とするミシンの針糸供給装
置。[Claims for Utility Model Registration] Disposed on the needle thread path between the thread take-up and the needle thread supply source so as to be spaced apart from each other at the front and the front in the needle thread supply direction, so that the needle thread cannot pass through due to its action and has no effect. two holding means 6 and 7 that act on the needle thread so that the needle thread can pass through the sewing machine, and a specific rotation angle of the main shaft that is arranged in relation to the main shaft and corresponds to the time when the sewing machine needle is located below the upper surface of the bed. A position detection device 17 that detects and generates a position signal.
and the needle thread path between the two holding means is changed periodically by a certain amount to increase the length of the path during the generation period of the position signal. A feeding body 12 that operates in synchronization with the thread take-up to minimize the length of the yarn until it reaches its maximum tension, and a feeding body 12 that detects the amount of yarn drawn in between the two holding means from the supply source and responds to the fed-in amount. A feed-out detection device 16 that generates a thread amount signal is used to disable the holding means on the supply source side in relation to the generation of the position signal, actuate the holding means on the thread take-up side, and operate the needle thread in conjunction with the feeding body. is fed from the supply source between both holding means, and the holding means on the supply source side is operated to prevent the needle thread from being fed out until the next position signal is generated in relation to the feeding of a preset amount of needle thread. In a needle thread supply device of a sewing machine, the needle thread feeder is connected to a thread take-up device so that a holding means on the thread take-up side is inactive so that a set length of needle thread is drawn out from a supply source and supplied to the thread take-up each time a stitch is formed. and a gate circuit G which receives the output of the position detection device as input, opens the circuit upon receiving the position signal, closes the circuit when the position signal disappears, and generates a different signal when receiving the yarn amount signal while the circuit is open and at other times. , a timer (TM) that operates for a certain period of time according to the gate circuit output when receiving a thread amount signal when the position signal disappears, and an alarm device 47 that operates in synchronization with the operation of the timer and generates light or sound. A needle thread supply device for a sewing machine, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985123172U JPH0328875Y2 (en) | 1985-08-10 | 1985-08-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985123172U JPH0328875Y2 (en) | 1985-08-10 | 1985-08-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6151173U JPS6151173U (en) | 1986-04-05 |
| JPH0328875Y2 true JPH0328875Y2 (en) | 1991-06-20 |
Family
ID=30681922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985123172U Expired JPH0328875Y2 (en) | 1985-08-10 | 1985-08-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0328875Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104762767B (en) * | 2015-04-23 | 2017-08-29 | 杰克缝纫机股份有限公司 | Sewing machine and its take-up |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5049046A (en) * | 1973-08-30 | 1975-05-01 | ||
| JPS5327851A (en) * | 1976-08-26 | 1978-03-15 | Brother Ind Ltd | Sewing machine with automatic yarn tension controller |
| JPS54163148A (en) * | 1978-06-15 | 1979-12-25 | Aisin Seiki | Automatic thread delivery device for sewing machine |
| JPS54163147A (en) * | 1978-06-13 | 1979-12-25 | Janome Sewing Machine Co Ltd | Device for automatically adjusting upper thread on sewing machine |
| JPS56163691A (en) * | 1980-05-20 | 1981-12-16 | Brother Ind Ltd | Alarm device for abnormality of sewing machine |
-
1985
- 1985-08-10 JP JP1985123172U patent/JPH0328875Y2/ja not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5049046A (en) * | 1973-08-30 | 1975-05-01 | ||
| JPS5327851A (en) * | 1976-08-26 | 1978-03-15 | Brother Ind Ltd | Sewing machine with automatic yarn tension controller |
| JPS54163147A (en) * | 1978-06-13 | 1979-12-25 | Janome Sewing Machine Co Ltd | Device for automatically adjusting upper thread on sewing machine |
| JPS54163148A (en) * | 1978-06-15 | 1979-12-25 | Aisin Seiki | Automatic thread delivery device for sewing machine |
| JPS56163691A (en) * | 1980-05-20 | 1981-12-16 | Brother Ind Ltd | Alarm device for abnormality of sewing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6151173U (en) | 1986-04-05 |
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