JPS63283685A - Automatic stitch balancing thread tension sewing machine - Google Patents

Automatic stitch balancing thread tension sewing machine

Info

Publication number
JPS63283685A
JPS63283685A JP11946487A JP11946487A JPS63283685A JP S63283685 A JPS63283685 A JP S63283685A JP 11946487 A JP11946487 A JP 11946487A JP 11946487 A JP11946487 A JP 11946487A JP S63283685 A JPS63283685 A JP S63283685A
Authority
JP
Japan
Prior art keywords
thread
needle
thread tension
sewing machine
tension
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.)
Pending
Application number
JP11946487A
Other languages
Japanese (ja)
Inventor
小川 雅夫
敏夫 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP11946487A priority Critical patent/JPS63283685A/en
Priority to US07/194,317 priority patent/US4886004A/en
Publication of JPS63283685A publication Critical patent/JPS63283685A/en
Pending legal-status Critical Current

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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】 [産業上の利用分野] 本発明は、自動糸調子可能なミシンに関し、特に、所定
のタイミングで上糸の供給を停止させる供給停止手段と
を設け、糸調子を自動的に制御し得る自動系調子可能な
ミシンに関する。
Detailed Description of the Invention [Industrial Application Field] The present invention relates to a sewing machine capable of automatic thread tension, and in particular, the present invention relates to a sewing machine capable of automatic thread tension. The present invention relates to a sewing machine that can be automatically controlled and automatically adjusted.

[従来技術] 従来、糸駒から天秤の糸保持部に至る上糸供給路には糸
調子皿が設けられ、この糸調子皿のスプリング力を調整
することにより加工布の厚さ、糸の太さ、縫目の長さ、
縫い方などに対応した上糸の引締め力となるように糸調
子を調節することが出来るようになっている。
[Prior Art] Conventionally, a thread tension disc is provided in the upper thread supply path from the thread spool to the thread holding portion of the thread take-up, and by adjusting the spring force of this thread tension disc, the thickness of the work cloth and the thickness of the thread can be adjusted. The length of the seam,
The thread tension can be adjusted so that the tightening force of the upper thread corresponds to the sewing method.

しかしながら、従来の糸調子装置においては、天秤の上
昇時に次の縫製のために引出される上糸が必要以上に引
出されないようにするため糸調子皿のスプリング力をあ
る程度強くする必要があった(下糸張力の略10倍)。
However, in the conventional thread tension device, it was necessary to increase the spring force of the thread tension disc to a certain extent in order to prevent the needle thread that is being pulled out for the next sewing to be pulled out more than necessary when the thread take-up lever is raised. (approximately 10 times the bobbin thread tension).

よって、常に上糸には強い挟持圧が加わっているため縫
始め及び線絡り時における布の無い状態でミシンを運転
した場合(以後カラ縫いという)、送り歯によって上糸
が容易に送られず、また、天秤の上昇時に糸が逆流しや
すいため余剰の糸が発生し、外釜に糸がらみを起してし
まい、ミシンが縫製不能になってしまうという欠点があ
った。
Therefore, strong clamping pressure is always applied to the upper thread, so if the sewing machine is operated without fabric at the beginning of sewing or when the line becomes tangled (hereinafter referred to as empty stitching), the upper thread is easily fed by the feed dog. Furthermore, since the thread tends to flow backwards when the thread take-up is raised, excess thread is generated, causing thread tangles in the outer hook, making it impossible for the sewing machine to sew.

そこで、前記糸調子皿を電気的に制御するようにしたミ
シンの上糸側m機構が特公昭53−41580号公報に
記載されている。この上糸制御機構においては、縫目形
成のため上糸が糸調子皿から間欠的に供給される期間の
み上糸を開放し、その他の期間には上糸を挟持拘束し上
糸を供給しないようになっており、カラ縫いを行った場
合、上糸は送り歯によって容易に送られ、外釜に糸がら
みを起こさないようにしている。
Therefore, Japanese Patent Publication No. 53-41580 discloses an upper thread side m mechanism of a sewing machine in which the thread tension disc is electrically controlled. In this upper thread control mechanism, the upper thread is released only during the period when the upper thread is intermittently supplied from the thread tension disc for stitch formation, and during other periods, the upper thread is clamped and restrained and the upper thread is not supplied. When performing empty stitches, the upper thread is easily fed by the feed dog to prevent thread tangles in the outer hook.

[発明が解決しようとする問題点] しかしながら、この上糸制御機構においては、例えばし
つけ縫い等の特別に上糸の張力を弱める必要がある縫い
方やギヤザー寄せ縫等の特別に上糸の張力を強める必要
がある縫い方ができないという欠点がある。
[Problems to be Solved by the Invention] However, in this upper thread control mechanism, the tension of the upper thread cannot be lowered in sewing operations such as basting stitches that require a special reduction in upper thread tension, or when sewing needle threads that require a special reduction in upper thread tension, such as gathered stitches. The disadvantage is that it cannot be sewn in a way that requires strengthening.

[発明の目的] 本発明は従来の問題点を解決するために為されたもので
、その目的は、加工布の厚さ、糸の太さ、縫目の長さな
どに対応して上糸の供給伍を制御する自動糸調子可能な
ミシンにおいて、特別に上糸の張力を弱めたり特別に上
糸の張力を強めたりする必要がおる縫い方なども縫製す
ることができるミシンを提供することにある。
[Purpose of the Invention] The present invention has been made to solve the problems of the conventional art. To provide a sewing machine capable of automatic thread adjustment that controls the supply of needle thread, and is capable of sewing sewing methods that require special weakening or strengthening of needle thread tension. It is in.

L問題点を解決するための手段] 前述の目的を達成するために、本発明は、布送り運動に
伴って糸供給源から自由に引出される上糸の供給を所定
のタイミングで停止させる自動糸調子可能なミシンにお
いて、糸供給源と縫針との間における上糸供給経路中に
設けられ、下糸の糸張力と略同じ程度の弱い糸張力の範
囲中において調節可能な糸張力を布送り運動に伴って引
出される上糸に加えるための糸調子手段を備えている。
Means for Solving Problem L] In order to achieve the above-mentioned object, the present invention provides an automatic method for stopping the supply of upper thread, which is freely drawn out from a thread supply source, at a predetermined timing as the cloth feed movement occurs. In a sewing machine capable of thread adjustment, the needle thread supply path between the thread supply source and the sewing needle is provided, and the thread tension can be adjusted within a range of weak thread tension, which is approximately the same as the thread tension of the bobbin thread. It is equipped with a thread tension means for applying tension to the upper thread that is pulled out as the machine moves.

[作用] 上述のように構成された自動糸調子可能なミシンにおい
ては、糸供給源から自由に引出される上糸に弱い張力を
加えることによる上糸の伸びを利用し、その張力を変化
させることによって上糸の伸び量を微妙に変化させて、
上糸の張力を変化させる。
[Function] In a sewing machine configured as described above and capable of automatic thread tension, a weak tension is applied to the upper thread that is freely drawn out from the thread supply source, and the elongation of the upper thread is utilized to change the tension. By slightly changing the amount of stretch of the upper thread,
Change the tension of the upper thread.

[実施例] 以下、本発明の実施例を図面に基いて説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.

第1図は、本発明を適用した電子制御式本縫ミシンを示
すもので、この本縫ミシンMにおいてベッド部2の右端
部には脚柱部4が立設され、この脚柱部4の上端から左
方に延びるアーム部6はベッド部2の上方に対向するよ
うに水平に配設され、アーム部6の上面には糸供給源と
しての糸駒16が取付けられている。そして、このアー
ム部6の左端部には頭部8が設けられている。この頭部
8には針棒10及び押え棒18が挿着され、この針棒1
0とその下端の縫針12とは後述のようにミシン主軸2
8により上下に駆動されるとともに図示外の揺動機構に
より左右に揺動駆動される。押え棒18とその下端の押
え足20とは図示外の操作体の操作により昇降される。
FIG. 1 shows an electronically controlled lockstitch sewing machine to which the present invention has been applied. An arm portion 6 extending leftward from the upper end is disposed horizontally so as to face above the bed portion 2, and a thread spool 16 as a thread supply source is attached to the upper surface of the arm portion 6. A head 8 is provided at the left end of the arm 6. A needle bar 10 and a presser bar 18 are inserted into this head 8, and this needle bar 1
0 and the sewing needle 12 at its lower end are connected to the main shaft 2 of the sewing machine as described later.
8, and is driven to swing from side to side by a swinging mechanism (not shown). The presser bar 18 and the presser foot 20 at its lower end are raised and lowered by operating an operating body not shown.

前記ベッド部2には針板22が設けられるとともに針板
22を貫いてベッド部2の上面に現われる送り歯23が
設けられている。送り歯23は布送り部材に相当し、針
棒10と布送り機構の送り歯との協働により加工布に所
定の縫目が形成されることになる。前記布送り機構は既
存の一般的な構成のものと同様なので詳しい説明は省略
する。
The bed portion 2 is provided with a throat plate 22 and a feed dog 23 that passes through the throat plate 22 and appears on the upper surface of the bed portion 2. The feed dog 23 corresponds to a cloth feed member, and predetermined stitches are formed on the work cloth by cooperation between the needle bar 10 and the feed dog of the cloth feed mechanism. The cloth feeding mechanism is similar to an existing general structure, so a detailed explanation will be omitted.

第2図〜第4図は、前記ミシンMの頭部8及びその付近
のアーム部6内に設けられた内部機構を示すものである
2 to 4 show the internal mechanism provided in the head 8 of the sewing machine M and the arm portion 6 in the vicinity thereof.

図示のように、前記針棒10の下端には縫針12が取付
けられ、針棒10は針棒支持体24に上下動自在に挿着
され、針棒支持体24の上端部は機枠にピン26を介し
て枢着され、これにより針棒10は針棒支持体24とと
もにピン26を中心として左右に揺動可能であり、針棒
10は針棒支持体24に対してミシン主軸2B及びその
主軸28の端部の針棒クランク30により上下に駆動さ
れるようになっている。
As shown in the figure, a sewing needle 12 is attached to the lower end of the needle bar 10, the needle bar 10 is inserted into a needle bar support 24 so as to be movable up and down, and the upper end of the needle bar support 24 is pinned to the machine frame. 26, and as a result, the needle bar 10 can swing left and right about the pin 26 together with the needle bar support 24, and the needle bar 10 is connected to the sewing machine main shaft 2B and its It is designed to be driven up and down by a needle bar crank 30 at the end of the main shaft 28.

前記押え棒18の下端部には押え足20が着脱可能に取
付られ、この押え棒18は図示外の機構により機枠に挿
着され、上昇位置と下降位置とに厘って位置切換えされ
、下降位置におるときには押え足20で加工布を針板2
2に押圧するようになっている。
A presser foot 20 is removably attached to the lower end of the presser bar 18, and the presser bar 18 is inserted into the machine frame by a mechanism not shown and is switched between a raised position and a lowered position. When in the lowered position, the presser foot 20 moves the work cloth onto the throat plate 2.
2.

次に天秤機構について第2図〜第4図により説明する。Next, the balance mechanism will be explained with reference to FIGS. 2 to 4.

前記ミシン主軸28はブツシュメタル32などを介して
機枠に回転自在に挿着され、この主軸28の斜め上の後
方には副軸34が主軸28と平行に配設され、この副軸
34は機枠に回動自在に挿着されている。この副軸34
に揺動レバー36の一端部が回動自在に連結され、この
揺動レバー36は副軸34から主軸28に固着された天
秤クランク38の左端面側へ延び、天秤クランク38の
クランクピン40は揺動レバー36の細長いカム孔42
を挿通して延びている。このカム孔42は揺動バー36
と共に糸確保手段を構成している。
The main shaft 28 of the sewing machine is rotatably inserted into the machine frame via a bushing metal 32, etc., and a sub-shaft 34 is disposed diagonally above and behind the main shaft 28 in parallel with the main shaft 28. It is rotatably attached to the frame. This secondary shaft 34
One end of a swinging lever 36 is rotatably connected to the swinging lever 36, and the swinging lever 36 extends from the countershaft 34 to the left end side of a balance crank 38 fixed to the main shaft 28. Elongated cam hole 42 of swing lever 36
It extends through the. This cam hole 42 is connected to the swing bar 36
Together with this, it constitutes a thread securing means.

揺動レバー36の左側においてクランクピン40の左端
部には連結板44が固着され、この連結板44から左方
へ延びる枢支ピン46には針棒クランク30が回動自在
に連結され、針棒クランク30の下端部が針棒10の中
段部に連結されている。
A connecting plate 44 is fixed to the left end of a crank pin 40 on the left side of the swing lever 36, and a needle bar crank 30 is rotatably connected to a pivot pin 46 extending leftward from the connecting plate 44. A lower end portion of the bar crank 30 is connected to a middle portion of the needle bar 10.

揺動レバー36の前部の上端部には、クランク状に上方
へ延びる糸取上体としての天秤48が一体的に形成され
、この天秤48の上端部には糸保持部48aが形成され
ている。
A thread take-up lever 48 as a thread take-up body extending upward in a crank shape is integrally formed at the upper end of the front part of the swing lever 36, and a thread holding portion 48a is formed at the upper end of this thread take-up 48. There is.

前記揺動レバー36のカム孔42は、第2図・第3図に
示すようにクランクピン、400回転軌跡と同半径で且
つ最上位置付近にあるクランクピン40が約74°回転
するのを許す円弧孔42aとその円弧孔42aの両端部
から真直ぐに延びる短かい直孔42bとから形成され、
このカム孔42の外周部は補強部36aで補強されてい
る。
The cam hole 42 of the swing lever 36 allows the crank pin 40, which has the same radius as the 400-rotation locus and is located near the uppermost position, to rotate approximately 74 degrees as shown in FIGS. 2 and 3. It is formed from a circular arc hole 42a and a short straight hole 42b extending straight from both ends of the circular arc hole 42a,
The outer periphery of this cam hole 42 is reinforced with a reinforcing portion 36a.

前記揺動レバー36のカム孔42にクランクピン40が
挿通した状態で天秤クランク38及びクランクピン40
が主軸28回りに回転すると、揺動レバー36は副軸3
4を揺動中心としてクランクピン40によって第3図に
実線で図示の最上位置と仮想線で図示の最下位置とに厘
って上下に往復揺動駆動される。このとき、ミシン主軸
28の回転運動に同期して針棒クランク30とクランク
ピン40を介して針棒10が上下に往復駆動されること
になる。
With the crank pin 40 inserted into the cam hole 42 of the swing lever 36, the balance crank 38 and the crank pin 40
rotates around the main shaft 28, the swing lever 36 rotates around the sub shaft 3.
4 is the center of rotation, and is driven to reciprocate up and down by a crank pin 40 between an uppermost position shown by a solid line in FIG. 3 and a lowermost position shown by a phantom line in FIG. At this time, the needle bar 10 is reciprocated up and down via the needle bar crank 30 and crank pin 40 in synchronization with the rotational movement of the sewing machine main shaft 28.

前記揺動レバー36のカム孔42の一部に前述のような
円弧孔42aが形成されているので、主軸28の回転位
相角をパラメータとする天秤48の運動は第5図の曲線
MAのようになり、針棒10の下端に取付けられた縫針
12の運動は第5図の曲線MBのようになり、布送り機
構の送り歯23の水平方向送り運動は第5図の折線MD
のようになる。
Since the circular arc hole 42a as described above is formed in a part of the cam hole 42 of the swing lever 36, the movement of the balance 48 using the rotational phase angle of the main shaft 28 as a parameter is as shown by the curve MA in FIG. The movement of the sewing needle 12 attached to the lower end of the needle bar 10 is as shown by the curve MB in FIG.
become that way.

天秤48は、布送りの開始後主軸28が約40度回転し
た時から縫針コ2の目孔が針板22の上面に達する時ま
で最上位置に保持される。従って、布送りの初期の段階
を除き布送りが実質的に実行される期間には天秤48が
最上位置に保持されている。但し、天秤4Bは布送り開
始の時から最上位置に位置するように揺動レバー36を
構成してもよい。何れにしても、本実施例における揺動
レバー36のMA造は比較的シンプルで円滑に静粛に作
動する。このため、天秤48が最上位置に位置している
間は糸駒16から天秤48の糸保持部48aを介して針
板22まで延びる上糸14の長さは常に一定となる。
The thread take-up 48 is held at the uppermost position from when the main shaft 28 rotates approximately 40 degrees after the start of cloth feeding until the eye of the sewing needle 2 reaches the upper surface of the throat plate 22. Therefore, the thread take-up 48 is held at the uppermost position during the period when cloth feeding is substantially carried out, except at the initial stage of cloth feeding. However, the swing lever 36 may be configured so that the lever 4B is located at the uppermost position from the time the cloth feed starts. In any case, the MA construction of the swing lever 36 in this embodiment is relatively simple and operates smoothly and quietly. Therefore, while the thread take-up 48 is at the uppermost position, the length of the needle thread 14 extending from the thread spool 16 to the throat plate 22 via the thread holding portion 48a of the thread take-up 48 is always constant.

次に糸通過料ms構について第2図〜第7図により説明
する。
Next, the thread passing charge ms structure will be explained with reference to FIGS. 2 to 7.

前記主軸28の左端の針棒クランク30の直ぐ左側には
機枠の一部である板部材50が主軸28と直交状に設け
られている。第2図・第3図に示すように主軸28より
も少し前方の位置で、板部材50の左側部には上糸14
に通過抵抗を与え得るブリテンション装置52が設けら
れている。
Immediately to the left of the needle bar crank 30 at the left end of the main shaft 28, a plate member 50, which is a part of the machine frame, is provided perpendicularly to the main shaft 28. As shown in FIGS. 2 and 3, a needle thread 14 is attached to the left side of the plate member 50 at a position slightly forward of the main shaft 28.
A britension device 52 is provided which can provide passage resistance to the passageway.

このブリテンション装置52は糸調子手段に相当し、第
8図に示すように、板部材50から主軸28と平行に延
びる軸92を有し、その軸92には一対の糸調子皿52
a、52aがその軸線方向に移動可能に取付けられてい
る。また、軸92の先端部は螺刻されており、その先端
部においてダイヤル94が螺合されている。ダイヤル9
4は操作部材に相当し、その回動操作に応じて軸線方向
に移動するように構成されている。糸調子皿52aとダ
イヤル94との間にはバネ定数0.62Ng/mtnの
コイルバネ96が配置されている。尚、このバネ定数に
よって上糸に加えられる上糸張力の強さは、下糸に加え
られる下糸張力と略同じである。また、コイルバネ96
の両端部には、それぞれバネ座98,100が嵌合され
ている。バネ座98.100は固定部材に相当し、コイ
ルバネ96の始端及び終端によってコイルバネ96の両
端面にできる段差部が一対の糸調子皿52a、52aの
挾持圧を微妙に変化させることを防止している。そして
、ダイヤル94を回動操作することによりバネ圧を調整
して、上糸14の糸通過抵抗を調整し得るようにしてい
る。
This britension device 52 corresponds to a thread tensioning means, and as shown in FIG.
a, 52a are mounted so as to be movable in the axial direction. Further, the tip of the shaft 92 is threaded, and a dial 94 is screwed onto the tip. dial 9
Reference numeral 4 corresponds to an operating member, which is configured to move in the axial direction in accordance with its rotational operation. A coil spring 96 having a spring constant of 0.62 Ng/mtn is arranged between the thread tension disc 52a and the dial 94. The strength of the upper thread tension applied to the upper thread by this spring constant is approximately the same as the lower thread tension applied to the lower thread. In addition, the coil spring 96
Spring seats 98 and 100 are fitted into both ends of the spring seats 98 and 100, respectively. The spring seats 98 and 100 correspond to fixing members, and prevent the stepped portions formed on both end surfaces of the coil spring 96 by the starting and ending ends of the coil spring 96 from slightly changing the clamping pressure between the pair of thread tension discs 52a and 52a. There is. By rotating the dial 94, the spring pressure can be adjusted to adjust the thread passage resistance of the upper thread 14.

更に、糸駒16から天秤48の糸保持部48aを経て縫
針12の目孔に至る上糸供給路のうち、糸駒16から天
秤48の糸保持部48aに至る上糸14を主軸28の運
動と調時して拘束したり解放したりすることが出来るよ
うに、次のような糸供給停止手段としての糸通過制御装
置54が設けられている。
Furthermore, the movement of the main shaft 28 moves the needle thread 14 from the thread spool 16 to the thread holding portion 48a of the thread take-up lever 48 in the needle thread supply path that extends from the thread spool 16 to the thread holding portion 48a of the thread take-up lever 48 to the eye of the sewing needle 12. A yarn passage control device 54 as a yarn supply stop means as described below is provided so that the yarn can be restrained or released at the same time.

前記ブリテンション装@52の下方位置において板部材
50の左側に糸道規制板56が固着され、この糸道規制
板56の左側面の近傍に配設された可動板58と解除部
材としてのリンクアーム60の下端部とが段付ネジ62
で板部材50に回動自在に枢着され可動板58の可動輪
64が糸道規制板56の規制部56aに下方より当接し
て規制部56aと可動輪64との間に上糸14を挟持拘
束し得るように配設されている。可動輪64は解除部材
に相当し、可動板58はその可動輪64が規制部56a
へ押圧されるように弾性体としてのバネ66で弾性付勢
され、可動板58の腕部58aの上端の接触部68がリ
ンクアーム60の下端近くの接触部60aに前方より接
触している。第3図・第7図に示すように、可動輪64
の周面には環状のV溝64aが形成され、可動輪64の
上半部の■溝64aが糸道規制板56の規制部56aに
係合し、このV溝64aと規制部56aとの間に上糸1
4が挟持拘束されるようになっている。
A thread path regulating plate 56 is fixed to the left side of the plate member 50 at the lower position of the britension device @ 52, and a movable plate 58 disposed near the left side of the thread path regulating plate 56 and a link as a release member. The lower end of the arm 60 and the stepped screw 62
The movable ring 64 of the movable plate 58, which is rotatably pivoted to the plate member 50, abuts the regulating part 56a of the thread path regulating plate 56 from below, thereby passing the upper thread 14 between the regulating part 56a and the movable ring 64. It is arranged so that it can be clamped and restrained. The movable ring 64 corresponds to a release member, and the movable ring 64 of the movable plate 58 corresponds to the regulating portion 56a.
The contact portion 68 at the upper end of the arm portion 58a of the movable plate 58 contacts the contact portion 60a near the lower end of the link arm 60 from the front. As shown in FIGS. 3 and 7, the movable ring 64
An annular V-groove 64a is formed on the circumferential surface of the movable ring 64, and the groove 64a in the upper half of the movable ring 64 engages with the regulating portion 56a of the yarn path regulating plate 56, and the V-groove 64a and the regulating portion 56a are connected to each other. 1 needle thread between
4 is clamped and restrained.

そして、主軸28の回転に調時して可動板58の可動輪
64を上下に駆動し上糸14の解放と拘束とを所定のタ
イミングで実行させるため、副軸34の右端側部分に対
応する位置において主軸28には楕円状のカム溝72を
有する回転カム70が固着され、副軸34に固着された
第1アーム74の先端の接触子74aがカム溝72に係
合している。尚、カム溝72はカム体に相当し、第1ア
ーム74は副軸34と共に制御手段を構成している。
Then, in order to drive the movable ring 64 of the movable plate 58 up and down in synchronization with the rotation of the main shaft 28 to release and restrain the upper thread 14 at a predetermined timing, it corresponds to the right end side portion of the sub-shaft 34. In this position, a rotating cam 70 having an elliptical cam groove 72 is fixed to the main shaft 28 , and a contact 74 a at the tip of a first arm 74 fixed to the subshaft 34 is engaged with the cam groove 72 . The cam groove 72 corresponds to a cam body, and the first arm 74 and the subshaft 34 constitute a control means.

一方、副軸34の左端部には第2アーム76が固着され
、第2アーム76の下端部はリンクアーム60の上端部
のルーズピン穴60bにピン76aを嵌めることにより
連結されている。
On the other hand, a second arm 76 is fixed to the left end of the subshaft 34, and the lower end of the second arm 76 is connected by fitting a pin 76a into a loose pin hole 60b at the upper end of the link arm 60.

以上の糸通過制御装置54において、主軸28が回転し
楕円状のカム溝72を介して第1アーム74が揺動する
と、副軸34を介して第2アーム76が揺動し、第2ア
ーム76が揺動するとリンクアーム60が段付ネジ62
を中心として揺動する。
In the yarn passage control device 54 described above, when the main shaft 28 rotates and the first arm 74 swings via the elliptical cam groove 72, the second arm 76 swings via the counter shaft 34, and the second arm When 76 swings, the link arm 60 engages the stepped screw 62.
oscillates around the center.

その結果リンクアーム60の接触部60aで接触部68
が前方へ押動されると、可動板58がバネ力に抗して回
動し、可動輪64が糸道規制板56の規制部56aから
離れ、上糸14が拘束状態から解放される。またリンク
アーム60の接触部60aが後方へ移動すると、可動板
58はバネ66の弾性力で回動し可動輪64が規制部5
6aに当接し、上糸14が規制部56aと可動輪64の
間に挟持拘束される。このようにそれぞれ所定のタイミ
ングで上糸14の解放と拘束とが実行されることになる
。このように上糸14を解放したり拘束したりするタイ
ミングは第5図の曲線MC−に示しである。
As a result, the contact portion 68 at the contact portion 60a of the link arm 60
When is pushed forward, the movable plate 58 rotates against the spring force, the movable ring 64 separates from the regulating portion 56a of the thread path regulating plate 56, and the upper thread 14 is released from the restrained state. Further, when the contact portion 60a of the link arm 60 moves rearward, the movable plate 58 rotates by the elastic force of the spring 66, and the movable ring 64 moves toward the restriction portion 5.
6a, and the needle thread 14 is held and restrained between the regulating portion 56a and the movable ring 64. In this way, the upper thread 14 is released and restrained at predetermined timings. The timing at which the upper thread 14 is released or restrained in this manner is shown by the curve MC- in FIG.

第5図から判るように、天秤48が最下位置から最上位
置まで上昇していく上糸14の引締め時には糸通過制御
装置54により上糸14が拘束されているので上糸14
の引締めが確実に実行される。天秤48が最上位置に達
し上糸14の引締めが完了したときには布送りと連動し
て上糸14を供給するため糸通過制御装置54による拘
束が解放され必要量の上糸14が糸駒16からブリテン
ション装置52を介して天秤48の方へ供給される。こ
のように上糸14の拘束を解放した状態で布送り及び針
振りが完了し、縫針12が針板22に達する時期までに
は上糸14が再び拘束され、このように上糸14を拘束
した状態で縫動作が実行され上糸輪が下糸ボビン側に形
成される。従って、布送りと針振りのために消費される
必要量の上糸14は確実に供給され、上糸輪の形成時に
は上糸14が拘束されているので不要な上糸14は供給
されない。
As can be seen from FIG. 5, when the thread take-up 48 is tightening the needle thread 14 as it rises from the lowest position to the highest position, the needle thread 14 is restrained by the thread passage control device 54, so the needle thread 14
tightening will be carried out reliably. When the thread take-up 48 reaches the uppermost position and tightening of the upper thread 14 is completed, the upper thread 14 is supplied in conjunction with the cloth feed, so that the restriction by the thread passage control device 54 is released, and the required amount of upper thread 14 is released from the thread spool 16. It is fed to the balance 48 via a britension device 52. Cloth feeding and needle swinging are completed with the upper thread 14 unrestricted, and by the time the sewing needle 12 reaches the throat plate 22, the upper thread 14 is restrained again. In this state, the sewing operation is performed and an upper thread loop is formed on the lower thread bobbin side. Therefore, the required amount of needle thread 14 consumed for cloth feeding and needle swinging is reliably supplied, and since the needle thread 14 is restrained when forming the needle thread loop, unnecessary needle thread 14 is not supplied.

そして、特別に上糸14を強めた縫目が必要な場合は、
ブリテンション装置52のダイヤル94を操作して上糸
14の挟持圧を強くすることにより、通常の場合よりも
、引出される上糸14の弾性的伸び量が大きくなる。そ
の結果として、供給される上糸14の長さが短くなり、
上糸14を強めた縫目が形成される。また、特別に上糸
14を弱めた縫目が必要な場合は、ブリテンション装置
52のダイヤル94を操作して上糸14の挟持圧を弱く
することにより、通常の場合よりも、引出される上糸1
4の弾性的伸び量が小さくなる。その結果として、供給
される上糸14の長さが長くなり、上糸14を弱めた縫
目が形成される。
If a stitch with a specially strengthened upper thread 14 is required,
By operating the dial 94 of the britension device 52 to increase the clamping pressure on the upper thread 14, the amount of elastic elongation of the upper thread 14 to be pulled out becomes greater than in the normal case. As a result, the length of the needle thread 14 supplied becomes shorter,
A stitch is formed in which the upper thread 14 is strengthened. In addition, if a stitch with a weakened upper thread 14 is required, the needle thread 14 can be pulled out more than in the normal case by operating the dial 94 of the britension device 52 to weaken the clamping pressure on the upper thread 14. Upper thread 1
4, the amount of elastic elongation becomes smaller. As a result, the length of the needle thread 14 that is supplied becomes longer, and a stitch in which the needle thread 14 is weakened is formed.

更に、ダイヤル94の不操作にもかかわらず上糸14の
太さに応じてコイルバネ96の伸縮率が変わりコイルバ
ネ96のバネ圧が変化するため、細い上糸14ではそれ
に適した弱い糸張力が加えられ、また太い上糸14では
それに適した強い糸張力が加えられることになる。
Furthermore, even if the dial 94 is not operated, the expansion/contraction rate of the coil spring 96 changes depending on the thickness of the needle thread 14, and the spring pressure of the coil spring 96 changes. In addition, when the needle thread 14 is thick, a strong thread tension suitable for the thick needle thread 14 is applied.

第5図曲線MOに示すように、前記回転カム70のカム
溝72の楕円形状により決定される拘束特性から、細い
上糸14の場合には点F、の時点で解放されまた点C1
の時点で拘束されるのに対して、太い上糸14の場合に
は点F1よりも遅い点F2の時点で解放され、また点C
1よりも早い点C2の時点で拘束される。従って、細い
上糸14ではそれに適した弱い張力で上糸14が引き締
められ、また太い上糸14ではそれに適した強い張力で
上糸14が引締められることになる。
As shown in the curve MO in FIG. 5, from the restraining characteristics determined by the elliptical shape of the cam groove 72 of the rotating cam 70, in the case of the thin needle thread 14, it is released at the point F and also at the point C1.
On the other hand, in the case of the thick upper thread 14, it is released at point F2, which is later than point F1, and is also restricted at point C.
It is constrained at point C2, which is earlier than point C2. Therefore, when the needle thread 14 is thin, the needle thread 14 is tightened with an appropriate weak tension, and when the needle thread 14 is thick, the needle thread 14 is tightened with a suitably strong tension.

次に、天秤48が下方へ揺動し且つ前記可動輪64と糸
道規制板56とで上糸14を拘束している間に糸駒16
から所定量の上糸14を繰出して貯えておく糸繰出し機
構78について第2図〜第4図に基いて説明する。
Next, while the thread take-up lever 48 is swinging downward and the upper thread 14 is being restrained by the movable ring 64 and the thread path regulating plate 56, the thread spool 16 is
The thread pay-out mechanism 78 that pays out and stores a predetermined amount of needle thread 14 will be described with reference to FIGS. 2 to 4.

前記揺動レバー36の一端部を支持する副軸34の部分
にはスリーブ80が回動自在に外嵌され、このスリーブ
80には揺動レバー36の一端部が固着されている。こ
のスリーブ80には側面視クランク状の作動アーム82
が固着され、作動アーム82の先端にはフック状の糸捕
捉部82aが形成されている。ミシンMのアーム部6の
左端の上端部には正面視門型の糸案内体84が配設され
、糸案内体84は上板部84aと上板部84aの右と左
の両端部より夫々下方へ鉛直に延びる第1案内板84b
と第2案内板84Cとを備え、この糸案内体84の第2
案内板84Cを板部材50の上端部にビス86で固着す
ることにより糸案内体84は機枠に取付けられ、この糸
案内体84は作動アーム82の上方近傍に配設されてい
る。第1案内板84bと第2案内板84Cとは左右方向
に所定圧離隔てて対向しており、第1案内板84bと第
2案内板84cには夫々第1案内溝88aと第2案内溝
88bが横向きに相対向するように形成され、これら第
1及び第2案内溝88a・88bの後端部は上糸14を
導入するため解放されている。更に、左側の第2案内板
84cの前端部には上方より切欠かれた第3案内溝90
が形成されている。
A sleeve 80 is rotatably fitted onto a portion of the subshaft 34 that supports one end of the swing lever 36, and one end of the swing lever 36 is fixed to the sleeve 80. This sleeve 80 has an actuation arm 82 that is crank-shaped when viewed from the side.
is fixed to the actuating arm 82, and a hook-shaped thread catching portion 82a is formed at the tip of the actuating arm 82. A gate-shaped thread guide body 84 is disposed at the upper end of the left end of the arm part 6 of the sewing machine M, and the thread guide body 84 extends from the upper plate part 84a and the right and left ends of the upper plate part 84a, respectively. First guide plate 84b extending vertically downward
and a second guide plate 84C.
The thread guide body 84 is attached to the machine frame by fixing the guide plate 84C to the upper end of the plate member 50 with screws 86, and the thread guide body 84 is disposed near the top of the operating arm 82. The first guide plate 84b and the second guide plate 84C face each other with a predetermined distance apart in the left-right direction, and the first guide plate 84b and the second guide plate 84c have a first guide groove 88a and a second guide groove, respectively. 88b are formed to face each other laterally, and the rear ends of the first and second guide grooves 88a and 88b are open for introducing the upper thread 14. Furthermore, a third guide groove 90 notched from above is provided at the front end of the second guide plate 84c on the left side.
is formed.

糸駒16から延びる上糸14は第1案内溝88aと第2
案内溝88bを経て第2案内板84Cの左側面から第3
案内溝90へ屈曲状に導入され、この第3案内溝90か
らブリテンション装置52を経由し糸道規制板56と可
動輪64との間で糸道規制板56の規制部56aの屈曲
部で上方へ屈曲され、その屈曲部から天秤48の先端の
糸保持部48aへ至り、その糸保持部48aより糸案内
部92・94を経て縫針12の目孔に延びている。
The upper thread 14 extending from the thread spool 16 is connected to the first guide groove 88a and the second guide groove 88a.
from the left side of the second guide plate 84C through the guide groove 88b.
The yarn is introduced into the guide groove 90 in a bent manner, and is passed from the third guide groove 90 through the britension device 52 and between the yarn path regulating plate 56 and the movable ring 64 at the bent portion of the regulating portion 56a of the yarn path regulating plate 56. It is bent upward, and extends from the bent portion to a thread holding portion 48a at the tip of the thread take-up lever 48, and from the thread holding portion 48a to the eye of the sewing needle 12 via thread guide portions 92 and 94.

前記作動アーム82と揺動レバー36は共にスリーブ8
0に固着され、天秤クランク38を介して主軸28の回
転と調時して夫々揺動駆動されるが、第3図に実線で図
示のように天秤48が最上位置にある間、作動アーム8
2は点線で図示のように第1及び第2案内溝888・8
8bの先端部を通る上糸14よりも後方に位置し、また
仮想線で図示のように天秤48が最下位置へ下降する際
、揺動レバー36が副軸34を中心として揺動すると作
動アーム82も仮想線で図示のように副軸34を中心と
して前方へ揺動し、作動アーム82の先端の糸捕捉部8
2aが第1及び第2案内溝88a・88bの前端部間に
亙る上糸14に交差するように前方へ移動する。このと
き、作動アーム82の糸捕捉部82aにより上糸14が
前方へ所定距離繰出されることになる。この繰出しの際
、上糸14は糸道規制板56と可動輪64とで拘束され
ているので糸駒]6から所定量の上糸が確実に繰出され
ることになる。
Both the operating arm 82 and the swinging lever 36 are connected to the sleeve 8.
0, and are driven to swing in synchronization with the rotation of the main shaft 28 via the balance crank 38. While the balance 48 is at the uppermost position as shown by the solid line in FIG.
2 are first and second guide grooves 888 and 8 as shown by dotted lines.
It is located behind the needle thread 14 that passes through the tip of the thread 8b, and is activated when the swing lever 36 swings around the secondary shaft 34 when the thread take-up 48 descends to the lowest position as shown by the imaginary line. The arm 82 also swings forward about the secondary shaft 34 as shown by the imaginary line, and the thread catcher 8 at the tip of the operating arm 82
2a moves forward so as to intersect the needle thread 14 extending between the front ends of the first and second guide grooves 88a and 88b. At this time, the needle thread 14 is let out a predetermined distance forward by the thread catching portion 82a of the operating arm 82. During this payout, the needle thread 14 is restrained by the thread path regulating plate 56 and the movable ring 64, so that a predetermined amount of the needle thread is reliably paid out from the thread spool 6.

このように、天秤48が最下位置にある間に糸繰出し機
構78の作動アーム82により上糸14が繰出されて糸
繰出し機構78からブリテンション装置52を経由して
糸道規制板56の屈曲部に至る上糸14は弛んだ状態と
なる。このように上糸14が弛んだ状態において、前述
のように天秤48が上昇していって上糸14の引き締め
が実行され、その後糸通過制御装置54による拘束が解
放されると送り歯による布送り動作と針振り動作により
必要量の上糸14が糸通過制御装置54を通って天秤4
8と縫針12の方へ供給されることになる。
In this way, while the thread take-up lever 48 is at the lowest position, the upper thread 14 is let out by the actuating arm 82 of the thread let-out mechanism 78, and the thread path regulating plate 56 is bent from the thread let-out mechanism 78 via the britension device 52. The needle thread 14 that reaches the end is in a relaxed state. In this state where the needle thread 14 is loosened, the thread take-up 48 is raised as described above to tighten the needle thread 14, and when the thread passage control device 54 releases the restraint, the feed dog tightens the needle thread 14. Due to the feeding operation and needle swinging operation, the necessary amount of upper thread 14 passes through the thread passage control device 54 and reaches the thread take-up 4.
8 and sewing needle 12.

尚、上糸14の解放前にも布送りが実行されるがこの布
送りによる上糸14の消費分は上糸14の弾性的伸び量
で補充され、上糸14の拘束を解放した時点でその延び
量が解消しつつ上糸14の供給が行なわれることになる
Note that cloth feeding is performed even before the upper thread 14 is released, but the amount of the upper thread 14 consumed by this cloth feeding is replenished by the amount of elastic stretch of the upper thread 14, and when the upper thread 14 is released from the restraint. The upper thread 14 is supplied while the amount of elongation is resolved.

このように、上糸14の太さに応じて上糸14の拘束及
び解放のタイミングが自動的に制御され、更に、ブリテ
ンション装置52のコイルバネ96は0.62NJ/m
の小さなバネ定数のコイルバネ96でよいため、上糸1
4の太さに応じてコイルバネ96のバネ圧が自然に変化
して、上糸張力の自動調整を行って布送り量と針振り同
とで定まる必要量の上糸14が順次確実に補充されるこ
とから、上糸14の太さに応じた最適の糸調子となる。
In this way, the timing of binding and releasing the upper thread 14 is automatically controlled according to the thickness of the upper thread 14, and furthermore, the coil spring 96 of the britension device 52 is 0.62 NJ/m
Since the coil spring 96 with a small spring constant is sufficient, the upper thread 1
The spring pressure of the coil spring 96 changes naturally according to the thickness of the coil spring 4, and the needle thread tension is automatically adjusted to ensure that the required amount of needle thread 14 determined by the fabric feed amount and needle swing is sequentially and reliably replenished. Therefore, the thread tension is optimal depending on the thickness of the upper thread 14.

また、本実施例においてはコイルバネ96の両端部にそ
れぞれバネ圧98.100が嵌合され、そのバネ圧98
,100を介してコイルバネ96のバネ力が糸調子皿5
2a及びダイヤル94に作用するようになっているため
、コイルバネ96の両端面にある段差部が糸調子に微妙
な影響を与えることを防止することができる。
Further, in this embodiment, spring pressures of 98 and 100 are fitted to both ends of the coil spring 96, respectively.
, 100, the spring force of the coil spring 96 is applied to the thread tension disc 5.
2a and the dial 94, it is possible to prevent the step portions on both end surfaces of the coil spring 96 from having a subtle influence on the thread tension.

尚、前記実施例を次のように部分的に変更してもよい。Note that the above embodiment may be partially modified as follows.

(1) 前記糸案内体84の第2案内体84cに対する
第1案内板84bの左右位置を調節可能に構成し、糸繰
出し量を調節可能に構成する。
(1) The lateral position of the first guide plate 84b with respect to the second guide body 84c of the thread guide body 84 is configured to be adjustable, and the amount of yarn let out is configured to be adjustable.

(2) 前記糸通過制御装置54にあける可動輪58を
駆動する機構を電気的アクチュエータで構成し、図示外
の制御装置からの制御信号で駆動制御する。
(2) A mechanism for driving the movable wheel 58 provided in the yarn passage control device 54 is constituted by an electric actuator, and is driven and controlled by a control signal from a control device not shown.

また、糸通過制御装置54において上糸14を挟持拘束
する機構としては各種の挟持拘束機構を採用することが
出来る。
Furthermore, various types of clamping and restraining mechanisms can be employed as the mechanism for clamping and restraining the upper thread 14 in the thread passage control device 54.

[発明の効果] 以上詳述したように、本発明は、布送り運動に伴って糸
供給源から自由に引出される上糸に作用する糸調子手段
を設け、その作用力を調節するようにしたため、引出さ
れる上糸の弾性力による上糸の伸び量を微妙に変化させ
ることができ、上糸の糸張力を変えることができる。
[Effects of the Invention] As described in detail above, the present invention provides a thread tension means that acts on the needle thread freely drawn out from the thread supply source as the fabric feeds, and adjusts the acting force thereof. Therefore, the amount of elongation of the needle thread due to the elastic force of the needle thread being pulled out can be slightly changed, and the thread tension of the needle thread can be changed.

また、本発明によれば、従来の糸調子装置のように天秤
によって上糸が引締められる時に糸供給源から不必要な
上糸が引出されるのを防ぐために下糸の張力の略10倍
程度の上糸張力を必要とせず、略下糸の張力と同じ程度
の弱い張力を上糸に加えるだけでよい。そのため、糸調
子手段は小ざなバネ定数を有するものでよく、上糸の太
さに応じる糸張力の調整を自動的に行うことができる。
Further, according to the present invention, the tension is approximately 10 times the tension of the lower thread in order to prevent unnecessary upper thread from being pulled out from the thread supply source when the upper thread is tightened by the thread take-up as in the conventional thread tension device. There is no need for needle thread tension, and it is only necessary to apply a weak tension to the needle thread, which is approximately the same as the tension of the bobbin thread. Therefore, the thread tension means may have a small spring constant, and the thread tension can be automatically adjusted according to the thickness of the upper thread.

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

図面は本発明の実施例を示すもので、第1図はミシンの
概略斜視図、第2図はミシンのアーム部と頭部内に組込
まれた内部機構の要部斜視図、第3図は前記内部機構の
側面図、第4図は前記内部機構の正面図、第5図は前記
ミシンの各機構の動作を示すタイムチャート、第6図は
第3図のVl−Vl線断面図、第7図は第4図のVI 
−VII線断面図、第8図はブリテンション装置の拡大
断面図である。 12:縫針、14:上糸、16:糸駒、23:送り歯、
50:板部材、52ニブリテンション装置、52a:糸
調子皿、54:糸通過制御装置。 92:軸、94:ダイヤル、96:コイルバネ。 98.100:バネ座
The drawings show an embodiment of the present invention, and FIG. 1 is a schematic perspective view of a sewing machine, FIG. 2 is a perspective view of the main parts of the internal mechanism built into the arm and head of the sewing machine, and FIG. 3 is a schematic perspective view of the sewing machine. 4 is a front view of the internal mechanism, FIG. 5 is a time chart showing the operation of each mechanism of the sewing machine, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 3, and FIG. Figure 7 is the VI of Figure 4.
-VII line sectional view, and FIG. 8 is an enlarged sectional view of the britension device. 12: Sewing needle, 14: Upper thread, 16: Thread spool, 23: Feed dog,
50: plate member, 52 nib tension device, 52a: thread tension disc, 54: thread passage control device. 92: Axis, 94: Dial, 96: Coil spring. 98.100: Spring seat

Claims (1)

【特許請求の範囲】 1、縫針(12)の上下動と調時して作動し、その縫針
(12)が針板面上方に位置する間に加工布を移送する
布送り部材(23)と、その布送り部材(23)の布送
り運動に伴って糸供給源(16)から自由に引出される
上糸(14)の供給を所定のタイミングで停止させるた
めに作動する糸供給停止手段(54)とを備え、前記上
糸(14)の糸繰出し量を自動的に制御する自動糸調子
可能なミシンにおいて、 前記糸供給源(16)と前記縫針(12)との間におけ
る上糸供給経路中に設けられ、下糸の糸張力と略同じ程
度の弱い糸張力の範囲中において調節可能な糸張力を前
記布送り運動に伴って引出される上糸(14)に加える
ための糸調子手段(52)を設けたことを特徴とする自
動糸調子可能なミシン。 2、前記糸調子手段(52)は、ミシン機枠(50)に
立設された軸(92)と、少なくとも一方が軸線方向に
移動可能に設けられた2枚の糸調子皿(52a、52a
)と、前記軸(92)に螺合され、その回動操作に応じ
て軸線方向に移動する操作部材(94)と、その操作部
材(94)と糸調子皿(52a)との間に設けられ、一
方の糸調子皿(52a)を他方の糸調子皿(52a)に
押圧するためのコイルバネ(96)と、前記軸線方向に
移動可能でそのコイルバネ(96)の両端部に固定され
た固定部材(98、100)とを備えていることを特徴
とする特許請求の範囲第1項記載の自動糸調子可能なミ
シン。
[Claims] 1. A cloth feeding member (23) that operates in synchronization with the vertical movement of the sewing needle (12) and transports the work cloth while the sewing needle (12) is positioned above the throat plate surface. , a thread supply stop means (operating to stop the supply of needle thread (14) freely drawn out from the thread supply source (16) at a predetermined timing in accordance with the cloth feeding movement of the cloth feeding member (23)); 54), in which the sewing machine is capable of automatic thread tension and automatically controls the thread payout amount of the needle thread (14), the needle thread supply between the thread supply source (16) and the sewing needle (12); A thread tension provided in the path and for applying an adjustable thread tension within a range of weak thread tension approximately equal to the thread tension of the bobbin thread to the upper thread (14) pulled out along with the cloth feeding movement. A sewing machine capable of automatic thread tension, characterized in that a means (52) is provided. 2. The thread tension means (52) includes a shaft (92) installed upright on the sewing machine frame (50) and two thread tension discs (52a, 52a), at least one of which is movable in the axial direction.
), an operating member (94) that is screwed onto the shaft (92) and moves in the axial direction in response to rotation of the shaft (92), and an operating member (94) provided between the operating member (94) and the thread tension disc (52a). a coil spring (96) for pressing one thread tension disc (52a) against the other thread tension disc (52a); and a fixing member movable in the axial direction and fixed to both ends of the coil spring (96). A sewing machine capable of automatic thread tension according to claim 1, characterized in that the sewing machine is equipped with members (98, 100).
JP11946487A 1987-05-15 1987-05-15 Automatic stitch balancing thread tension sewing machine Pending JPS63283685A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP11946487A JPS63283685A (en) 1987-05-15 1987-05-15 Automatic stitch balancing thread tension sewing machine
US07/194,317 US4886004A (en) 1987-05-15 1988-05-16 Needle thread tension control including separate stopping and adjustable pre-tension devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11946487A JPS63283685A (en) 1987-05-15 1987-05-15 Automatic stitch balancing thread tension sewing machine

Publications (1)

Publication Number Publication Date
JPS63283685A true JPS63283685A (en) 1988-11-21

Family

ID=14761989

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11946487A Pending JPS63283685A (en) 1987-05-15 1987-05-15 Automatic stitch balancing thread tension sewing machine

Country Status (1)

Country Link
JP (1) JPS63283685A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57170288A (en) * 1981-04-14 1982-10-20 Tokyo Juki Industrial Co Ltd Controller for delivery of upper cotton for sewing machine
JPS6019278A (en) * 1983-07-12 1985-01-31 Omron Tateisi Electronics Co Card transaction processor
JPS63283686A (en) * 1987-05-15 1988-11-21 ブラザー工業株式会社 Automatic stitch balancing thread tension sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57170288A (en) * 1981-04-14 1982-10-20 Tokyo Juki Industrial Co Ltd Controller for delivery of upper cotton for sewing machine
JPS6019278A (en) * 1983-07-12 1985-01-31 Omron Tateisi Electronics Co Card transaction processor
JPS63283686A (en) * 1987-05-15 1988-11-21 ブラザー工業株式会社 Automatic stitch balancing thread tension sewing machine

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