JPS63234995A - Automatic thread tensible lock stitch sewing machine - Google Patents
Automatic thread tensible lock stitch sewing machineInfo
- Publication number
- JPS63234995A JPS63234995A JP6971887A JP6971887A JPS63234995A JP S63234995 A JPS63234995 A JP S63234995A JP 6971887 A JP6971887 A JP 6971887A JP 6971887 A JP6971887 A JP 6971887A JP S63234995 A JPS63234995 A JP S63234995A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- needle
- take
- amount
- sewing machine
- 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
Links
- 238000009958 sewing Methods 0.000 title claims description 70
- 239000004744 fabric Substances 0.000 claims description 38
- 230000033001 locomotion Effects 0.000 claims description 18
- 230000004913 activation Effects 0.000 claims description 2
- 230000032258 transport Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 description 24
- 230000001105 regulatory effect Effects 0.000 description 17
- 230000000694 effects Effects 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical group C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
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本縫ミシンに関し、特に布送
りに伴って糸駒から天秤の方へ上糸が供給される期間に
は最大糸取上量を確保した状態で上糸の供給を実行させ
、その他の期間には糸供給停止手段で上糸の供給を停止
し、加工布の厚薄によらず加工布に応じた糸調子が自動
的に得られるようにしたものに関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lockstitch sewing machine capable of automatic thread adjustment, and particularly during the period when the upper thread is supplied from the thread spool to the thread take-up as the fabric is fed, the maximum The needle thread is supplied while the thread take-up amount is secured, and during other periods, the needle thread supply is stopped by the thread supply stop means, and the thread tension is adjusted according to the work fabric regardless of the thickness of the work fabric. Regarding things that can be obtained automatically.
−ａに、ミシンの主軸と調時して上下運動する天秤は、
下降するときに縫針による縫製のための上糸を下糸ボビ
ン側へ供給し、また上昇するときに縫製行程で縫針の目
孔に形成された上糸輪を引き締め且つつぎの縫製のため
に上糸を糸駒から所定量補充する役割を果たしている。At -a, there is a thread take-up that moves up and down in synchronization with the main shaft of the sewing machine.
When descending, the upper thread for sewing with the sewing needle is supplied to the lower thread bobbin side, and when ascending, the upper thread loop formed in the eye of the sewing needle is tightened during the sewing process, and the upper thread is supplied to the lower thread bobbin for sewing the next stitch. It plays the role of replenishing a predetermined amount of thread from the thread spool.
糸駒から天秤の糸保持部に至る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、布の種類、糸の太さ、糸の種類、
縫目の長さなどに対応した上糸の引き締め力となるよう
に糸調子を調節することが出来るようになっている。A thread tension disc is installed in the thread supply path from the thread spool to the thread holding section of the thread take-up, and by adjusting the spring force of this thread tension disc, the thickness of the fabric to be processed, the type of fabric, the thickness of the thread, and the type of,
The thread tension can be adjusted so that the tightening force of the upper thread corresponds to the length of the stitch.
従来から、天秤機構としては、−Ｓにミシン主軸に設け
た回転カムで天秤をｉと動駆動するようにしたカム天秤
、天秤クランクに連結された天秤と天秤支えとからなる
リンク天秤などが用いられている。Traditionally, as a take-up mechanism, there have been used a cam take-up lever in which the take-up lever is dynamically driven with a rotary cam attached to the main shaft of the sewing machine, and a link take-up consisting of a take-up take-up and a take-up support connected to a take-up crank. It is being
これに対して、米国特許第１０７３４８９号公報にも記
載されているように、機枠に枢着した擦動レバーに天秤
を一体形成し、擦動レバーのカム溝に天秤クランクのク
ランクピンを係合させることにより天秤を上下に擦動駆
動するようにした天秤機構も知られている。On the other hand, as described in U.S. Patent No. 1,073,489, a take-up lever is integrally formed on a friction lever pivotally attached to the machine frame, and a crank pin of the take-up crank is engaged with a cam groove of the friction lever. A balance mechanism is also known in which the balance is slidably driven up and down by adjusting the balance.
この公報に記載された天秤機構では、天秤が最下位置に
位置した状態で加工布に刺挿された縫針の目孔から延び
る上糸ループの形成を正確に且つ効率的に行なわせるこ
とを目的として、擦動レバーとカム溝と擦動レバーの支
軸の構成に工夫が凝らされている。The purpose of the thread take-up mechanism described in this publication is to accurately and efficiently form a needle thread loop extending from the eye of a sewing needle inserted into the workpiece cloth when the thread take-up is at the lowest position. As such, the structure of the friction lever, cam groove, and shaft of the friction lever has been devised.
一方、前記糸調子皿を電気的に制御するようにしたミシ
ンの上糸制′４Ｂ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
のみ上糸を解放し、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いる。On the other hand, Japanese Patent Publication No. 53-41580 discloses an upper thread control mechanism '4B 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 disk for stitch formation, and during other periods, the upper thread is clamped and restrained and the upper thread is not supplied. It looks like this.
前記従来の天秤機構（カム天秤、リンク天秤、擦動レバ
一式天秤）においては、天秤が最上位置に位置する時間
は極めて短かく天秤の上死点は一点にすぎない。In the conventional balance mechanisms (cam balances, link balances, sliding lever set balances), the time the balance is at the highest position is extremely short, and the top dead center of the balance is only one point.
天秤が最下位置から引上げられるときに、下糸ボビン側
へ延びた上糸ループを引き締めるとともに天秤が最上位
置付近から最上位置へ上昇する間に送り歯により加工布
が送られつつ次の縫動作で必要な上糸が天秤によって糸
調子皿を介して繰出されることになるが、天秤の上死点
が一点にすぎないことから次のような問題がある。When the thread take-up is pulled up from the lowest position, it tightens the needle thread loop extending toward the bobbin thread bobbin, and while the thread take-up is raised from near the top position to the top position, the feed dog feeds the workpiece cloth and starts the next sewing operation. The necessary upper thread is fed out by the thread take-up through the thread tension disc, but since the thread take-up has only one top dead center, the following problem arises.
即ち、天秤が上死点付近にあるときに、送り歯による送
り量と針振りによる振り幅量に応じて糸調子皿を通して
必要量の上糸が繰出されるが、天秤の上死点が一点にす
ぎないにも拘らず、布送りと針振りに伴なう上糸の消費
は主軸の回転速度とともに変動する所定時間に亙って行
なわれる。そして、上糸の引き締め時に上糸に作用する
張力と糸調子皿における抵抗力と布送りのタイミングな
どに応じて上糸の供給量が微妙に変動する。このように
繰出される上糸の供給量が適切でないと糸調子が変動す
ることになる。以上のように、天秤、送り歯、釜及び縫
針の運動のタイミングが上糸供給量及び糸調子に著しい
影響を及ぼしている。In other words, when the thread take-up is near the top dead center, the necessary amount of needle thread is paid out through the thread tension plate according to the feed amount by the feed dog and the swing width by the needle swing, but the top dead center of the thread take-up is at one point. Although this is only a short time, the consumption of needle thread due to cloth feeding and needle swinging takes place over a predetermined period of time which varies with the rotational speed of the main shaft. Then, the amount of upper thread supplied varies slightly depending on the tension applied to the upper thread when tightening the upper thread, the resistance force in the thread tension disc, the timing of cloth feeding, etc. If the amount of needle thread fed in this way is not appropriate, the thread tension will fluctuate. As described above, the timing of movement of the thread take-up, feed dog, shuttle, and sewing needle has a significant effect on the amount of needle thread supplied and the thread tension.
例えば、半回転釜の場合には、上糸ループがドライバか
ら外れるタイミングの差によって上糸に作用する抵抗が
変動して、縫じわなどの問題が起る。また、全回転釜の
場合には、上糸に作用する抵抗がミシン主軸の回転速度
の変動によって変動するため縫製の速度によって糸調子
が変動し一定の糸調子とならない。For example, in the case of a half-rotation hook, the resistance acting on the needle thread fluctuates due to the difference in the timing at which the needle thread loop comes off from the driver, causing problems such as seam creases. In addition, in the case of a full-rotation hook, the resistance acting on the upper thread varies depending on the rotational speed of the main shaft of the sewing machine, so the thread tension varies depending on the sewing speed and does not maintain a constant thread tension.
本発明は糸駒から天秤の方へ上糸が供給される期間には
最大糸取上量を確保した状態で上糸の供給を実行させ、
またその他の期間には上糸の供給を停止させるようにし
た自動糸調子可能な本縫ミシンを提供することである。The present invention executes the supply of the needle thread while ensuring the maximum thread take-up amount during the period when the needle thread is supplied from the thread spool to the thread take-up,
Another object of the present invention is to provide a lockstitch sewing machine capable of automatic thread adjustment, which stops the supply of upper thread during other periods.
本発明に係る自動糸調子可能な本縫ミシンは、縫針の上
下動と調時して作動し、その縫針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と、上糸が最大弛み
量まで弛む第１の位置と上糸が最大糸取上量まで取上げ
られる第２の位置との間にて縫針の上下動と調時して運
動する糸取上体と、糸供給源から糸取上体を介して縫針
の目礼に至る上糸供給路とを備え、加工布中に上糸と下
糸との結節点を形成する本縫ミシンにおいて、前記糸取
上体が前記第２の位置に位置する時にその糸取上体が保
持する上糸を捕捉し、前記最大糸取上量を確保するため
にその上糸捕捉状態を保持し得る糸量確保部材と、前記
布送り部材の布送り運動と少なくとも部分的に重なるよ
うに決定された時点にて始まり、前記縫針の目孔が針板
面近傍へ降下する時点で終了する特定期間の間、前記糸
量確保部材に上糸捕捉状態を保持させ、その特定期間以
外の期間糸量確保部材に上糸の解放を行わせる糸量確保
駆動手段と、前記布送り部材の布送り運動に伴って前記
糸供給源から糸取上体に向かって自由に引出される上糸
の供給を停止させるために作動する糸供給停止手段と、
その糸供給停止手段が前記特定期間の間上糸の供給を許
可するように糸供給停止手段の作動時点及び作動期間を
制御するために縫針の上下動と調時して作動する制御手
段とを設けたものである。The lockstitch sewing machine capable of automatic thread adjustment according to the present invention operates in synchronization with the vertical movement of the sewing needle, and includes a cloth feeding member that transports the workpiece cloth while the sewing needle is positioned above the throat plate surface, and an upper thread. A thread take-up body that moves in synchronization with the vertical movement of the sewing needle between a first position where the needle thread is loosened to the maximum amount and a second position where the upper thread is taken up to the maximum thread pick-up amount; In a lockstitch sewing machine that is equipped with an upper thread supply path from a needle thread source to a thread of a sewing needle via a thread take-up member, and forms a knot between the upper thread and the bobbin thread in a workpiece cloth, the thread take-up member is a thread amount ensuring member capable of capturing the upper thread held by the thread take-up body when located at the second position and maintaining the upper thread catching state in order to ensure the maximum thread take-up amount; During a specific period of time that starts at a time determined to at least partially overlap with the cloth feeding movement of the cloth feeding member and ends when the eye of the sewing needle descends near the throat plate surface, the thread amount securing member a thread amount securing drive means that causes the thread amount securing member to hold the needle thread in a captured state and release the upper thread for a period other than the specified period; a thread supply stop means that operates to stop the supply of upper thread freely drawn out toward the thread take-up body;
a control means that operates in synchronization with the vertical movement of the sewing needle to control the activation time and period of the thread supply stop means so that the thread supply stop means permits supply of upper thread for the specified period; It was established.
尚、必要に応じて、前記糸量確保駆動手段は、ミシン主
軸と共に回転し、糸量確保部材に上糸の捕捉及びその解
放を行わせるカム手段を設けてもよい。If necessary, the thread amount securing drive means may be provided with a cam means that rotates together with the main shaft of the sewing machine and causes the thread amount securing member to capture and release the upper thread.
尚、場合によっては、前記糸確保部材は、前記糸取上体
の第２の位置近傍に回動可能に配置され、先端に上糸捕
捉フック部を有してもよい。In some cases, the thread securing member may be rotatably disposed near the second position of the thread take-up body and may have an upper thread catching hook portion at its tip.
本発明に係る自動糸調子可能な本縫ミシンの作用は次の
ようになる。The operation of the lockstitch sewing machine capable of automatic thread tension according to the present invention is as follows.
上糸が最大弛み量まで弛む第１の位置（最下位置）と上
糸が最大糸取上量まで取上げられる第２の位置（最上位
置）とに亙って、縫針の上下動と調時して糸取上体（天
秤機構）が上下駆動され、その糸取上体が第１の位置か
ら第２の位置へ向って上昇運動するときに上糸が引き締
められ、縫針の目孔に形成された上糸輪（上糸ループ）
が引き締められて、加工布中に上糸と下糸との結節点が
形成される。糸取上体が第１の位置より上昇し始め縫針
が針板面上方に位置する間に布送り部材によって加工布
が移送される。Vertical movement and timing of the sewing needle between the first position (lowest position) where the needle thread is loosened to the maximum amount and the second position (top position) where the needle thread is taken up to the maximum thread take-up amount. Then, the thread take-up body (take-up mechanism) is driven up and down, and when the thread take-up body moves upward from the first position to the second position, the needle thread is tightened and formed in the eye of the sewing needle. Needle thread loop
is tightened, and a node between the upper thread and the lower thread is formed in the work cloth. While the thread take-up body begins to rise from the first position and the sewing needle is located above the needle plate surface, the work cloth is transported by the cloth feed member.
糸取上体が第２の位置に位置する時に、糸量確保部材に
より糸取上体で保持する上糸が捕捉され且つ最大糸取上
量を確保するためにその上糸捕捉状態が保持される。When the thread take-up body is located at the second position, the needle thread held by the thread take-up body is captured by the thread amount ensuring member, and the needle thread captured state is maintained in order to ensure the maximum amount of thread pick-up. Ru.
糸量確保部材が上糸を捕捉するのは布送り部材の布送り
運動と少なくとも部分的に重なるように決定された時点
から縫針の目孔が針板面近傍へ降下する時点に至る特定
期間であり、糸量確保駆動手段はその特定期間において
糸量確保部材に上糸捕捉状態を保持させ、またその特定
期間以外において糸量確保部材に上糸の解放を行わせる
。The thread amount securing member captures the needle thread during a specific period from the time determined to at least partially overlap with the cloth feeding movement of the cloth feeding member to the time when the eye of the sewing needle descends near the throat plate surface. The thread amount securing drive means causes the thread amount securing member to maintain the upper thread catching state during the specified period, and causes the thread amount securing member to release the upper thread outside the specified period.
一方、布送り運動に伴って糸供給源から糸取上体に向っ
て自由に引き出される上糸の供給を停止させる糸供給停
止手段が設けられており、この糸供給停止手段は制御手
段により制御される。On the other hand, a thread supply stop means is provided for stopping the supply of the needle thread freely drawn out from the thread supply source toward the thread take-up body as the fabric feeds, and this thread supply stop means is controlled by the control means. be done.
即ち、制御手段は縫針の上下動と調時して糸供給停止手
段に特定期間の間上糸の供給を許可するタイミングを制
御するとともに、供給を許可する期間を制御する。That is, the control means controls the timing of permitting the thread supply stop means to supply needle thread for a specific period in synchronization with the vertical movement of the sewing needle, and also controls the period during which supply is permitted.
このように、布送りと針振りの動作が実質的に実行され
る間に亙って上糸が糸量確保部材により最大糸取上量の
状態で保持される一方、糸取上体が最上位置に達した時
に糸供給停止手段が作動せず上糸が自由に供給されるの
で、布送り量と針振り幅とに応じた必要量の上糸が糸供
給源から確実に供給されることになる。In this way, the upper thread is held at the maximum thread take-up amount by the thread amount securing member while the thread take-up body is in the uppermost state while the cloth feeding and needle swinging operations are substantially executed. When the position is reached, the thread supply stop means does not operate and the needle thread is freely supplied, so that the required amount of needle thread according to the cloth feed amount and needle swing width is reliably supplied from the thread supply source. become.
また、糸取上体が第１の位置から第２の位置に達するま
では糸供給停止手段により上糸の供給が停止されている
ので、縫針の目孔から延びる上糸輪を引き締める動作が
一定条件下に実行され、糸調子が著しく安定することに
なる。In addition, since the supply of needle thread is stopped by the thread supply stop means until the thread take-up body reaches the second position from the first position, the action of tightening the needle thread loop extending from the eye of the sewing needle is constant. Under these conditions, the thread tension becomes extremely stable.
本発明に係る自動糸調子可能な本縫ミシンによれば、以
上説明したように、布送り及び針振り時には糸供給を許
し且つ上糸を所定期間に亙って最大糸取上量の状態に保
持することにより、必要量の上糸が糸供給源から糸取上
体の方へ確実に供給されるようになる。また、糸取上体
を第１の位置から上昇させるときには糸供給を停止する
ことにより上糸の引き締めが確実且つ効果的に実行され
るようになる。その結果、糸調子が安定し、上糸肝き締
め時の抵抗力の変動などに基く縫じわの現象が解消し、
縫製スピードが変動じても安定した糸調子が得られる。According to the lockstitch sewing machine capable of automatic thread adjustment according to the present invention, as explained above, thread supply is allowed during cloth feeding and needle swinging, and the needle thread is maintained at the maximum thread take-up amount over a predetermined period of time. This ensures that the necessary amount of needle thread is supplied from the thread supply source to the thread take-up body. Furthermore, by stopping the thread supply when raising the thread take-up body from the first position, the needle thread can be tightened reliably and effectively. As a result, the thread tension is stabilized, and the phenomenon of seam wrinkles caused by fluctuations in resistance when tightening the upper thread is eliminated.
Stable thread tension can be obtained even if the sewing speed changes.
以下、本発明の実施例について図面に基いて説明する。 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、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が装着され、この針棒１０とその下端の縫針１
２とは後述のようにミシン主軸２８により上下に駆動さ
れるとともに図示外の擦動機構により左右に擦動駆動さ
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 is applied. In this lockstitch sewing machine M, a pedestal part 4 is erected at the right end of the bed part 2. An arm portion 6 extending leftward from the upper end is disposed horizontally so as to face above the bed portion 2, and a head portion 8 is provided at the left end portion of the arm portion 6. A needle bar 10 and a presser bar 18 are attached to the head 8, and the needle bar 10 and the sewing needle 1 at its lower end are attached to the head 8.
2 is driven vertically by a sewing machine main shaft 28 as will be described later, and is also slidably driven from side to side by a sliding 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、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 section 2 is provided with a needle plate 22 and a feed dog 23 that passes through the needle plate 22 and appears on the top surface of the bed section 2. A predetermined seam will be formed on the surface. The cloth feeding mechanism has the same general structure as that of the existing cloth feeding mechanism, so a detailed explanation thereof 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ｌＯは針棒支持体２４に上下動自在に装着
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擦動可能であり、針棒
１０は針棒支持体２４に対して主軸２８及び主軸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 attached to a needle bar support 24 so as to be movable up and down, and the upper end of the needle bar support 24 is attached to a pin 26 on the machine frame. As a result, the needle bar 10 is movable to the left and right about the pin 26 together with the needle bar support 24, and the needle bar 10 is pivotally connected to the needle bar support 24 by the main shaft 28 and the main shaft 28. It is designed to be driven up and down by a needle bar crank 30 at the end.
前記押え棒１８の下端部には押え足２ｏが着脱可能に取
付けられ、この押え棒１８は図示外の機構により機枠に
装着され、上昇位置と下降位置とに亙って位置切換えさ
れ、下降位置にあるときには押え足２０で加工布を針板
２２に押圧するようになっている。A presser foot 2o is detachably attached to the lower end of the presser bar 18, and the presser foot 2o is attached to the machine frame by a mechanism not shown, and is switched between a raised position and a lowered position. When in this position, the presser foot 20 presses the work cloth against the throat plate 22.
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
機枠に回転自在に装着され、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装着されている。この副軸３４
に擦動レバー３６の ゛一端部が回動自在に連結され
、この擦動レバー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は擦動レバー３６の細長いカム
孔４２を挿通して延び、擦動レバー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。The main shaft 28 of the sewing machine is rotatably attached to 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, and this sub-shaft 34 is attached to the machine frame. It is rotatably attached to. This secondary shaft 34
One end of a friction lever 36 is rotatably connected to the lever 36 , and the friction lever 36 extends from the subshaft 34 to the left end side of a balance crank 38 fixed to the main shaft 28 , and is connected to a crank pin 40 of the balance crank 38 . extends through an elongated cam hole 42 of the friction lever 36, and a connecting plate 44 is fixed to the left end of the crank pin 40 on the left side of the friction lever 36.
A needle bar crank 30 is rotatably connected to a pivot pin 46 extending leftward from the connecting plate 44.
The lower end portion of the needle bar 10 is connected to the middle portion of the needle bar 10.
補動レバー３６の前部の上端部には、クランク状に上方
へ延びる天秤４８ （糸取上体）が一体内に形成され、
この天秤４８の上端部のヘッド部４８ａには糸保持部４
８ｂが形成されている。At the upper end of the front part of the auxiliary lever 36, there is formed a thread take-up lever 48 (thread take-up body) that extends upward in a crank shape.
A head portion 48a at the upper end of this thread take-up 48 has a thread holding portion 4.
8b is formed.
更に、この天秤４８の糸保持部４８ｂを含むヘッド部４
８ａにはそのヘッド部４８ａと同形状の補助ヘッド部４
８ｃがヘッド部４８ａと所定路離隔て且つ対向して天秤
４８と一体的に形成され、この補助ヘッド部４８ｃには
糸保持部４８ｄが形成されている。Furthermore, the head portion 4 including the thread holding portion 48b of this thread take-up 48
8a has an auxiliary head part 4 having the same shape as the head part 48a.
A thread holder 8c is integrally formed with the thread take-up lever 48, facing and separated from the head part 48a by a predetermined distance, and a thread holding part 48d is formed in this auxiliary head part 48c.
前記補動レバー３６のカム孔４２は、第２図・第３図に
示すように真直ぐに延びる直孔であり、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 auxiliary lever 36 is a straight hole extending straight as shown in FIGS.
The outer peripheral portion of is reinforced with a reinforcing portion 36a.
前記揺動レバー３６のカム孔４２にクランクビン４０が
挿通した状態で天秤クランク３８及びクランクビン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く第２の位置）と仮想線で図示の
最下位置（第１の位置）とに互って上下に往復揺動駆動
される。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 are opened.
rotates around the main shaft 28, the swing lever 36 rotates around the sub shaft 3.
The crank pin 40 is used to reciprocate up and down between the uppermost position (the second position shown by the solid line in FIG. 3) and the lowermost position (the first position) shown by the imaginary line in FIG. dynamically driven.
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。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は直孔に形成されてい
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Ｍ
Ｂ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 cam hole 42 of the swing lever 36 is formed as a straight hole, the movement of the thread take-up 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 is the curve M in FIG.
B, and the horizontal direction feeding motion of the feed dog 23 of the cloth feeding mechanism becomes as shown by the broken line MD in FIG.
次に、天秤４８が最上位置に位置したときに、上糸１４
を捕捉し且つ上糸捕捉状態を所定期間に亙って保持する
ための糸量確保装置５０について、第２図〜第６図によ
り説明する。Next, when the thread take-up lever 48 is located at the uppermost position, the upper thread 14
A thread amount securing device 50 for capturing the upper thread and maintaining the upper thread captured state for a predetermined period of time will be explained with reference to FIGS. 2 to 6.
前記アーム部６の上面の前端で天秤４８が最上位置のと
きのヘッド部４８ａ及び補助ヘッド部４８Ｃの直ぐ右方
の位置において機枠が所定幅に亙って上方に突出し、こ
の上方に突出した機枠の上端近傍部には主軸２８と平行
に支軸５２が回動自在に枢支されている。The machine frame protrudes upward over a predetermined width at a position immediately to the right of the head section 48a and the auxiliary head section 48C when the balance 48 is at the uppermost position at the front end of the upper surface of the arm section 6; A support shaft 52 is rotatably supported in parallel with the main shaft 28 near the upper end of the machine frame.
そして、支軸５２の右端側部分に対応する位置において
主軸２８には略卵形状のカム溝５４を有する回転カム５
６が固着され、支軸５２に固着された駆動アー、ム５８
の先端の接触子５８ａがカム溝５４に係合している。The rotating cam 5 has a substantially egg-shaped cam groove 54 on the main shaft 28 at a position corresponding to the right end side portion of the support shaft 52.
6 is fixed to the drive arm 58 fixed to the support shaft 52.
A contact 58a at the tip of is engaged with the cam groove 54.
一方、天秤４８のヘッド部４８ａと補助ヘッド部４８ｃ
との中間位置に対応する支軸５２の左端部には糸保持レ
バー６０が固着され、この糸保持レバー６０の下端部に
は上糸を引掛けて保持し得るフック部６０ａが形成され
ている。On the other hand, the head portion 48a and the auxiliary head portion 48c of the balance 48
A thread holding lever 60 is fixed to the left end of the spindle 52 corresponding to an intermediate position between the thread holding lever 60 and the lower end of the thread holding lever 60. .
以上の糸量確保装置５０において、主軸２８が回転しカ
ム溝５４を介して駆動アーム５８が揺動すると、支軸５
２を介して糸保持レバー６０は、第３図に実線で図示の
捕捉位置と仮想線で図示の解放位置とに亙ってヘッド部
４８ａと補助ヘッド部４８ｃとの中間位置において前後
に往復揺動駆動される。In the yarn amount securing device 50 described above, when the main shaft 28 rotates and the drive arm 58 swings via the cam groove 54, the support shaft 5
2, the thread holding lever 60 is reciprocated back and forth at an intermediate position between the head portion 48a and the auxiliary head portion 48c between a capture position shown in solid lines in FIG. 3 and a release position shown in phantom lines in FIG. dynamically driven.
卯ち、第３図・第５図に示すように、天秤４８が最高位
置のときに糸保持レバー６０が捕捉位置に揺動され、そ
のフック部６０ａは両糸保持部４８ｂ・４８ｄに亙って
掛は渡された上糸１４の直ぐ下方に位置し、この天秤４
８の最高位置から天秤４８が下降し縫針１２の目孔が針
板２２に到達するまでの上糸捕捉期間（特定期間）に亙
ってフック部６０ａで上糸１４を保持（第３図参照）す
る。その期間直後に糸保持レバー６０が解放位置へ揺動
されるのに伴って上糸１４はフック部６０ａによる捕捉
を解放される。この糸保持レバー６０は上糸捕捉期間以
外の上糸解放期間に亙って解放位置に保持される。As shown in FIGS. 3 and 5, when the thread take-up lever 48 is at the highest position, the thread holding lever 60 is swung to the catching position, and its hook portion 60a extends over both thread holding portions 48b and 48d. The lever is located directly below the passed upper thread 14, and this thread take-up 4
The needle thread 14 is held by the hook portion 60a for a needle thread capture period (specific period) until the thread take-up lever 48 descends from the highest position of the sewing needle 12 and the eye of the sewing needle 12 reaches the throat plate 22 (see FIG. 3). )do. Immediately after this period, the thread holding lever 60 is swung to the release position, and the upper thread 14 is released from being captured by the hook portion 60a. The thread holding lever 60 is held at the release position during the needle thread release period other than the needle thread capture period.
次に糸通過制御機構について第２図〜第５図・第７図〜
第８図により説明する。Next, the thread passage control mechanism is shown in Figures 2 to 5 and 7.
This will be explained with reference to FIG.
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６２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６２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６４が必要に
応じて設けられる。Immediately to the left of the needle bar crank 30 at the left end of the main shaft 28, a plate member 62, which is 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 62 at a position slightly forward of the main shaft 28.
A britension device 64 that can provide passage resistance is provided as necessary.
このブリテンション装置６４は１対の糸調子皿６４ａの
間に上糸１４を通過させ、ダイヤルを回動操作すること
によりスプリング力を調整して糸通過抵抗を調節し得る
ようにしたものであり、このブリテンション装置６４は
省略してもよい。This britension device 64 allows the upper thread 14 to pass between a pair of thread tension discs 64a, and by rotating a dial, the spring force can be adjusted to adjust the thread passing resistance. , this britension device 64 may be omitted.
更に、糸駒１６から天秤４８の糸保持部４８ｂ・４８ｄ
を経て縫針１２の目孔に至る上糸供給路のうち、糸駒１
６から天秤４８の糸保持部４８ｂ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、次のような糸通過制御装置６６が設けら
れている。Furthermore, the thread holding parts 48b and 48d of the thread take-up lever 48 from the thread spool 16
Of the upper thread supply path leading to the eye of the sewing needle 12 through
A thread passage control device 66 as described below is provided so that the upper thread 14 from the upper thread 14 to the thread holding portion 48b of the thread take-up lever 48 can be restrained or released in synchronization with the movement of the main shaft 28. There is.
前記ブリテンション装置６４の下方位置において板部材
６２の左側に糸道規制板６８が固着され、この糸道規制
板６８の左側面の近傍に配設された可動板７０とリンク
アーム７２の下端部とが段付ネジ７４で板部材６２に回
動自在に枢着され、可動板７０の可動輪７６が糸道規制
板６８の規制部６８ａに下方より当接して規制部６８ａ
と可動輪７６との間に上糸１４を挟持拘束し得るように
配設され、可動板７０はその可動輪７６が規制部６８ａ
へ押圧されるようにバネ７８で弾性付勢され、可動板７
０の腕部７０ａの上端の接触軸８０がリンクアーム７２
の下端近くの接触部７２ａに前方より接触している。第
３図・第８図に示すように、可動輪７６の周面には環状
の■溝７６ａが形成され、可動輪７６の上半部のＶ溝７
６ａが糸道規制板６８の規制部６８ａに係合し、このＶ
溝７６ａと規制部６８ａとの間に上糸１４が挟持拘束さ
れるようになっている。A thread path regulating plate 68 is fixed to the left side of the plate member 62 at a position below the britension device 64, and a movable plate 70 and a lower end of a link arm 72 are disposed near the left side of the thread path regulating plate 68. is rotatably attached to the plate member 62 by a stepped screw 74, and the movable ring 76 of the movable plate 70 abuts the regulating portion 68a of the yarn path regulating plate 68 from below to close the regulating portion 68a.
The movable plate 70 is arranged so that the needle thread 14 can be held and restrained between the movable ring 76 and the movable ring 76.
The movable plate 7 is elastically biased by a spring 78 so as to be pressed toward the
The contact shaft 80 at the upper end of the arm portion 70a of 0 is the link arm 72.
The contact portion 72a near the lower end of is contacted from the front. As shown in FIGS. 3 and 8, an annular groove 76a is formed on the circumferential surface of the movable ring 76, and a V-shaped groove 76a is formed in the upper half of the movable ring 76.
6a engages with the regulating portion 68a of the thread path regulating plate 68, and this V
The needle thread 14 is held and restrained between the groove 76a and the regulating portion 68a.
そして、主軸２８の回転に調時して可動板７０の可動輪
７６を上下に駆動し上糸１４゛の開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８２
を有する回転カム８１が固着され、副軸３４に固着され
た第１アーム８３の先端の接触子８３ａがカム１８２に
係合している。Then, in order to drive the movable ring 76 of the movable plate 70 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. At this position, the main shaft 28 has an elliptical cam groove 82.
A rotary cam 81 having a shape is fixed thereto, and a contact 83a at the tip of a first arm 83 fixed to the subshaft 34 is engaged with the cam 182.
一方、副軸３４の左端部には第２アーム８４が固着され
、第２アーム８４の下端部はリンクアーム７２の上端部
のルーズピン穴７２ｂにピン８４ａを嵌めることにより
連結されている。On the other hand, a second arm 84 is fixed to the left end of the subshaft 34, and the lower end of the second arm 84 is connected by fitting a pin 84a into a loose pin hole 72b at the upper end of the link arm 72.
以上の糸通過制御装置６６において、主軸２８が回転し
楕円状のカム溝８２を介して第１アーム８３が揺動する
と、副軸３４を介して第２アーム８４が補動し、第２ア
ーム８４が揺動するとリンクアーム７２が段付ネジ７４
を中心として補動する。In the yarn passage control device 66 described above, when the main shaft 28 rotates and the first arm 83 swings via the elliptical cam groove 82, the second arm 84 is supplemented via the counter shaft 34, and the second arm 84 swings, the link arm 72 engages the stepped screw 74.
Supplementary movement is centered on
その結果リンクアーム７２の接触部７２ａで接触軸８０
が前方へ押動されると、可動板７０がバネ力に抗して回
動し、可動輪７６が糸道規制板６８の規制部６８ａ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７２の接触部７２ａが後方へ移動すると、可動板
７０はバネ７８の弾性力で回動し可動輪７６が規制部６
８ａに当接し、上糸１４が規制部６８ａと可動輪７６の
間に挟持拘束される。このように夫々所定のタイミング
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 shaft 80 at the contact portion 72a of the link arm 72
When is pushed forward, the movable plate 70 rotates against the spring force, the movable ring 76 separates from the regulating portion 68a of the thread path regulating plate 68, and the upper thread 14 is released from the restrained state. Further, when the contact portion 72a of the link arm 72 moves rearward, the movable plate 70 rotates due to the elastic force of the spring 78, and the movable ring 76 moves toward the restriction portion 6.
8a, and the needle thread 14 is held and restrained between the regulating portion 68a and the movable ring 76. In this way, the upper thread 14 is released and restrained at predetermined timings. The timing at which the needle 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の引き締め時には糸通過制
御装置６６により上糸１４が拘束されているので上糸１
４の引き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の引き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６６に
よる拘束が解放され必要量の上糸１４が糸駒１６から天
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 lever 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 66.
4 tightening is 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 the restriction by the thread passage control device 66 is released, and the required amount of upper thread 14 is released from the thread spool 16. It is supplied to the balance 48. 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.
第５図曲線ＭＣに示すように、前記回転カム８１のカム
溝８２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Ｆ１の時点で解放されまた点Ｃ８
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Ｆ＋よりも遅い点Ｆ２の時点で解放されまた点Ｃ８
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が引き締められることになる。As shown by the curve MC in FIG. 5, due to the restraining characteristics determined by the elliptical shape of the cam groove 82 of the rotating cam 81, in the case of a thin needle thread 14, it is released at the point F1 and at the point C8.
In contrast, in the case of thick upper thread 14, it is released at point F2, which is later than point F+, and is restrained at point C8.
It is constrained at point C2, which is earlier than . 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７６と糸
道規制板６８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８５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 76 and the thread path regulating plate 68, the thread spool 16 is
The thread pay-out mechanism 85 that pays out and stores a predetermined amount of needle thread 14 from the needle thread 14 will be explained based on 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８６が回動自在に外嵌され、このスリーブ
８６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８６には側面視クランク状の作動アーム８７
が固着され、作動アーム８７の先端にはフック状の糸捕
捉部８７ａ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８８が配設され
、糸案内体８８は上板部８８ａと上板部８８ａ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８８ｂ
と第２案内板８８ｃとを備え、この糸案内体８８の第２
案内板８８ｃを板部材６２の上端部にビス８９で固着す
ることにより糸案内体８８は機枠に取付けられ、この糸
案内体８８は作動アーム８７の上方近傍に配設されてい
る。第１案内板８８ｂと第２案内板８８ｃとは左右方向
に所定路離隔てて対向しており、第１案内板８８ｂと第
２案内板８８ｃには夫々第１案内溝９０ａと餉２案内溝
９０ｂ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９０ａ・９０ｂ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
８８ｃの前端部には上方より切欠かれた第３案内溝９１
が形成されている。A sleeve 86 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 86. This sleeve 86 has an actuation arm 87 that is crank-shaped when viewed from the side.
is fixed to the actuating arm 87, and a hook-shaped thread catching portion 87a is formed at the tip of the actuating arm 87. A gate-shaped thread guide 88 is disposed at the upper end of the left end of the arm 6 of the sewing machine M. First guide plate 88b extending vertically downward
and a second guide plate 88c.
The thread guide body 88 is attached to the machine frame by fixing the guide plate 88c to the upper end of the plate member 62 with screws 89, and the thread guide body 88 is disposed near the top of the operating arm 87. The first guide plate 88b and the second guide plate 88c face each other with a predetermined distance apart in the left-right direction, and the first guide plate 88b and the second guide plate 88c have a first guide groove 90a and a second guide groove, respectively. 90b are formed to face each other laterally, and the rear ends of these first and second guide grooves 90a and 90b are open for introducing the upper thread 14. Furthermore, a third guide groove 91 notched from above is provided at the front end of the second guide plate 88c on the left side.
is formed.
糸駒１６から延びる上糸１４は第１案内ａ９０ａと第２
案内溝９０ｂを経て第２案内板８８ｃの左側面から第３
案内溝９１へ屈曲状に導入され、この第３案内溝９１か
らブリテンション装置６４を経由し糸道規制板６８と可
動輪７６との間で糸道規制ｔｉ８の規制部６８ａ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４８ｂを経て糸保持部４８ｄへ至り、その糸保
持部４８ｄ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 a90a and the second guide a90a.
from the left side of the second guide plate 88c through the guide groove 90b.
It is introduced into the guide groove 91 in a bent manner, and from this third guide groove 91 via the britension device 64, it is passed upward at the bent part of the regulating portion 68a of the yarn guide regulating ti8 between the yarn path regulating plate 68 and the movable ring 76. From the bent portion, it passes through a thread holding portion 48b at the tip of the thread take-up lever 48, reaches a thread holding portion 48d, and extends from the thread holding portion 48d to the eye of the sewing needle 12 via thread guide portions 92 and 94.
前記作動アーム８７と駆動レバー３６は共にスリーブ８
６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が最上位置にある開作動アーム８７
は点線で図示のように第１及び第２案内溝９０ａ・９０
ｂの前端部を通る上糸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８７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８７の先端の糸捕捉部８７ａ
が第１及び第２案内溝９０ａ・９０ｂ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８７の糸捕捉部８７ａ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６８と可動輪７６とで拘束されてい
るので糸駒１６から所定量の上糸が確実に繰出されるこ
とになる。The actuation arm 87 and the drive lever 36 are both attached to the sleeve 8.
The opening actuating arm 87 is fixed to the lever 6 and is driven to swing in synchronization with the rotation of the main shaft 28 via the balance crank 38, with the lever 48 in the uppermost position as shown by the solid line in FIG.
are the first and second guide grooves 90a and 90 as shown by dotted lines.
When the swing lever 36 swings about the counter shaft 34 when the thread take-up 48 descends to the lowest position as shown by the imaginary line, the operating arm 87 also swings forward about the secondary shaft 34 as shown in the imaginary line, and the thread catching portion 87a at the tip of the operating arm 87
moves forward so as to intersect the needle thread 14 extending between the front ends of the first and second guide grooves 90a and 90b. At this time,
The needle thread 14 is let out a predetermined distance forward by the thread catching portion 87a of the operating arm 87. During this unwinding, the upper thread 14 is restrained by the thread path regulating plate 68 and the movable ring 76, so that a predetermined amount of upper thread is reliably let out from the thread spool 16.
このように、天秤４８が最下位置にある間に糸繰出し機
構８５の作動アーム８７により上糸１４が繰出されて糸
繰出し機構８５からブリテンション装置６４を経由して
糸道規制板６８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６６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６６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 manner, while the thread take-up lever 48 is at the lowest position, the upper thread 14 is let out by the actuating arm 87 of the thread let-out mechanism 85, and the thread path regulating plate 68 is bent from the thread let-out mechanism 85 via the britension device 64. 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 66 releases the restraint, the feed dog tightens the needle thread 14. Due to the feeding operation and the needle swinging operation, the required amount of upper thread 14 passes through the thread passage control device 66 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伸び
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、布送り量と針
振り量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 the required amount of upper thread 14 determined by the cloth feed amount and needle swing amount is reliably replenished one after another. Therefore, the thread tension is optimal depending on the thickness of the upper thread 14.
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）前記糸量確保装置５０は、最上位置にある糸保持
部４８ｂ・４８ｄの近傍に主軸２８ど平行に配設され主
軸２８に連動連結された回転軸と、この回転軸に固着さ
れ糸保持部４８ｂ・４８ａ間に部分的に突入し糸捕捉爪
部を有する回転カム板とで構成することも出来る。(1) The yarn amount securing device 50 includes a rotating shaft that is disposed parallel to the main shaft 28 near the thread holding parts 48b and 48d at the uppermost position and is interlockingly connected to the main shaft 28, and a rotating shaft that is fixed to the rotating shaft and that is attached to the thread. It can also be constructed with a rotating cam plate that partially extends between the holding parts 48b and 48a and has a thread catching claw part.
（２）前記糸案内体８８の第２案内体８８ｃに対す゛る
第１案内板８８ｂ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。(2) The lateral position of the first guide plate 88b with respect to the second guide body 88c of the thread guide body 88 is configured to be adjustable, and the amount of yarn let out is configured to be adjustable.
（３）前記糸通過制御装置６６における可動板７０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。(3) A mechanism for driving the movable plate 70 in the thread passage control device 66 is constructed of 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６６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 a mechanism for clamping and restraining the upper thread 14 in the thread passage control device 66.
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４図ＶＩ−Ｖｌ線断面図、第７図は第４図■−■線断
面図、第８図は第３図■−■線断面図である。
Ｍ・・ミシン、 １０・・針棒、 １２・・縫針、１４
・・上糸、 １６・・糸駒、 ２２・・針板、２４・・
針棒ガイド、 ２８・・ミシン主軸、３４・・副軸、
３６・・揺動レバー、 ３８・・天秤クランク、 ４
０・・クランクビン、４２・・カム孔、 ４８・・天秤
、 ４８ａ・・ヘッド部、 ４８ｂ・・糸保持部、 ４
８ｃ・・補助ヘッド部、 ４８ｄ・・糸保持部、 ５０
・・糸量確保装置、 ５２・・支軸、 ５４・・カム溝
、 ５６・・回転カム、 ５８・・駆動アーム、 ６０
・・糸保持レバー、 ６０ａ・・フック部、 ６６・・
糸通過制御装置、 ６８・・糸道規制板、 ７０・・可
動板、 ７２・・リンクアーム、 °７４・・段付ネジ
、 ７６・・可動輪、８０・・接触軸、 ８１・・回転
カム、 ８２・・カム溝、 ８３・・第１アーム、 ８
４・・第２アーム。
特 許 出 願 人 ブラザー工業株式会社第１図
Ｍ
前方 ｌ
第３図
第４図
第６図
第７図
１を
第８図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 line VI-Vl in FIG. 4, and FIG. The figures are a cross-sectional view taken along the line ■-■ in FIG. 4, and FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. 3. M... Sewing machine, 10... Needle bar, 12... Sewing needle, 14
...Upper thread, 16..Thread spool, 22..Throat plate, 24..
Needle bar guide, 28... Sewing machine main shaft, 34... Sub-shaft,
36... Swing lever, 38... Balance crank, 4
0... Crank bottle, 42... Cam hole, 48... Balance, 48a... Head part, 48b... Thread holding part, 4
8c...Auxiliary head part, 48d...Thread holding part, 50
...Thread amount securing device, 52.. Support shaft, 54.. Cam groove, 56.. Rotating cam, 58.. Drive arm, 60.
...Thread holding lever, 60a...Hook part, 66...
Thread passage control device, 68...Thread path regulation plate, 70...Movable plate, 72...Link arm, °74...Stepped screw, 76...Movable ring, 80...Contact shaft, 81...Rotating cam , 82...Cam groove, 83...First arm, 8
4. Second arm. Patent applicant: Brother Industries, Ltd. Figure 1 M Forward l Figure 3 Figure 4 Figure 6 Figure 7 Figure 1 to Figure 8
Claims (3)
面上方に位置する間に加工布を移送する布送り部材と、
上糸が最大弛み量まで弛む第１の位置と上糸が最大糸取
上量まで取上げられる第２の位置との間にて縫針の上下
動と調時して運動する糸取上体と、糸供給源から糸取上
体を介して縫針の目孔に至る上糸供給路とを備え、加工
布中に上糸と下糸との結節点を形成する本縫ミシンにお
いて、前記糸取上体が前記第２の位置に位置する時にそ
の糸取上体が保持する上糸を捕捉し、前記最大糸取上量
を確保するためにその上糸捕捉状態を保持し得る糸量確
保部材と、 前記布送り部材の布送り運動と少なくとも部分的に重な
るように決定された時点にて始まり、前記縫針の目孔が
針板面近傍へ降下する時点で終了する特定期間の間、前
記糸量確保部材に上糸捕捉状態を保持させ、その特定期
間以外の期間糸量確保部材に上糸の解放を行わせる糸量
確保駆動手段と、 前記布送り部材の布送り運動に伴って前記糸供給源から
糸取上体に向かって自由に引出される上糸の供給を停止
させるために作動する糸供給停止手段と、 その糸供給停止手段が前記特定期間の間上糸の供給を許
可するように糸供給停止手段の作動時点及び作動期間を
制御するために縫針の上下動と調時して作動する制御手
段とを設けたことを特徴とする自動糸調子可能な本縫ミ
シン。(1) a cloth feeding member that operates in synchronization with the vertical movement of the sewing needle and transports the workpiece cloth while the sewing needle is positioned above the throat plate surface;
a thread take-up body that moves in synchronization with the vertical movement of the sewing needle between a first position where the needle thread is loosened to a maximum amount and a second position where the needle thread is picked up to the maximum thread pick-up amount; In a lockstitch sewing machine that is equipped with a needle thread supply path from a thread supply source to an eye of a sewing needle via a thread take-up body, and forms a knot between the needle thread and the bobbin thread in the workpiece cloth, the thread take-up a thread amount securing member capable of capturing the upper thread held by the thread take-up body when the thread take-up body is located at the second position and maintaining the upper thread catching state in order to ensure the maximum thread take-up amount; , the amount of thread is increased during a specific period of time that begins at a time determined to at least partially overlap with the cloth feeding movement of the cloth feeding member and ends when the eye of the sewing needle descends near the needle plate surface. a thread amount securing drive means for causing the securing member to hold the upper thread in a captured state and causing the thread amount securing member to release the upper thread for a period other than the specified period; a thread supply stop means operative to stop the supply of upper thread freely drawn from the source toward the thread take-up body; A lockstitch sewing machine capable of automatic thread adjustment, characterized in that the lockstitch sewing machine is provided with a control means that operates in synchronization with the vertical movement of a sewing needle in order to control the activation point and operation period of the thread supply stop means.
し、糸量確保部材に上糸の捕捉及びその解放を行わせる
カム手段を有す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本縫ミシン。(2) The thread amount securing drive means has a cam means that rotates together with the main shaft of the sewing machine and causes the thread amount securing member to capture and release the upper thread.
A lockstitch sewing machine capable of automatic thread tension as described in Section 1.
傍に回動可能に配置され、先端に上糸捕捉フック部を有
することを特徴とする特許請求の範囲第１項記載の自動
糸調子可能な本縫ミシン。(3) The thread securing member is rotatably arranged near the second position of the thread take-up body, and has an upper thread catching hook portion at its tip. Lockstitch sewing machine with automatic thread tension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6971887A JPS63234995A (en) | 1987-03-23 | 1987-03-23 | Automatic thread tensible lock stitch sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6971887A JPS63234995A (en) | 1987-03-23 | 1987-03-23 | Automatic thread tensible lock stitch sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63234995A true JPS63234995A (en) | 1988-09-30 |
Family
ID=13410890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6971887A Pending JPS63234995A (en) | 1987-03-23 | 1987-03-23 | Automatic thread tensible lock stitch sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63234995A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6137192A (en) * | 1984-07-27 | 1986-02-22 | ブラザー工業株式会社 | Needle thread amount controller of sewing machine |
-
1987
- 1987-03-23 JP JP6971887A patent/JPS63234995A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6137192A (en) * | 1984-07-27 | 1986-02-22 | ブラザー工業株式会社 | Needle thread amount controller of sewing machine |
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