JPS63272388A - Automatic thread tension adjustable main sewing machine - Google Patents

Automatic thread tension adjustable main sewing machine

Info

Publication number
JPS63272388A
JPS63272388A JP10702587A JP10702587A JPS63272388A JP S63272388 A JPS63272388 A JP S63272388A JP 10702587 A JP10702587 A JP 10702587A JP 10702587 A JP10702587 A JP 10702587A JP S63272388 A JPS63272388 A JP S63272388A
Authority
JP
Japan
Prior art keywords
thread
needle
sewing machine
take
sewing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10702587A
Other languages
Japanese (ja)
Inventor
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 JP10702587A priority Critical patent/JPS63272388A/en
Publication of JPS63272388A publication Critical patent/JPS63272388A/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、自動糸調子可能な本縫ミシンに関し、特に、
特定の期間の間上糸の最大系取上Wを確保するために縫
針の上下動と調時して作動する糸確保手段と、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糸調子可能な本縫
ミシンに関する。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lockstitch sewing machine capable of automatic thread tension, and in particular,
A thread securing means that operates in synchronization with the vertical movement of the sewing needle to ensure the maximum system take-up W of the upper thread for a specific period, and a supply stop means that stops supplying the upper thread at a predetermined timing. The present invention relates to a lockstitch sewing machine capable of automatically controlling thread tension.

[従来技術] 一般に、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pFii製のための上糸を下
糸ボビン側へ供給し、また上昇するとぎに縫製行程で縫
針の目礼に形成された上糸輪を引き締め且つ次の縫製の
ために上糸を糸駒から所定足補充する役割を果たしてい
る。
[Prior art] In general, a thread take-up that moves up and down in synchronization with the main shaft of a sewing machine is
When descending, the needle thread for pFii production by the sewing needle is supplied to the bobbin thread bobbin side, and as it ascends, it tightens the needle thread loop formed on the sewing needle during the sewing process and prepares for the next sewing. It plays the role of replenishing a predetermined number of needle threads from the thread spool.

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、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 provided in the needle thread supply path from the thread spool to the thread holding part of the thread take-up lever, 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, etc. The thread tension can be adjusted so that the tightening force of the upper thread corresponds to the type of thread, the length of the stitch, etc.

そして、天秤と糸調子皿との間の上糸供給路中に上糸を
たぐることにより糸量の微妙なバランスを保持するため
の糸取りバネが設けられている。
A thread take-up spring is provided in the needle thread supply path between the thread take-up lever and the thread tension disc to maintain a delicate balance in the amount of thread by pulling the needle thread.

そして、糸取りバネは、例えば縫針の目孔がベッド面近
傍へ降下する時点においては縫目を形成するだめに必要
な糸足に対して天秤の供給する糸足が少なくなるために
、上糸供給路の距離が短くなるように上糸に作用して縫
目形成に使われる糸量と天秤の供給する糸足を一致させ
るようにしている。
The thread take-up spring is used to supply the needle thread because, for example, when the eye of the sewing needle descends to the vicinity of the bed surface, the thread take-up supply is less than the thread thread required to form a stitch. It acts on the upper thread so that the thread length is shortened so that the amount of thread used to form the stitch matches the amount of thread supplied by the thread take-up.

[発明が解決しようとする問題点] しかしながら、槌目形成に使われる糸量が自動的に糸駒
から繰出され、その後に上糸の供給を停止させるような
自動糸調子可能な本縫ミシンにおいては、従来のミシン
のような糸取りバネを設けると、縫目形成時において上
糸が糸駒から繰出されるとき糸取りバネによって上糸供
給路の距離が長くなるように作用してしまい、その結果
、縫目形成に必要な糸屑より多足の糸が糸駒から繰出さ
れ、上糸の供給停止俊、天秤が最上位置に上昇しながら
糸線めを行うとき糸量が多すぎて糸線り不良になる問題
点がめる。
[Problems to be Solved by the Invention] However, in a lockstitch sewing machine capable of automatic thread adjustment, in which the amount of thread used for forming the hammer stitches is automatically paid out from the thread spool, and then the supply of needle thread is stopped. If a thread take-up spring is installed like in a conventional sewing machine, when the needle thread is paid out from the thread spool during stitch formation, the thread take-up spring acts to lengthen the needle thread supply path. , More thread than thread waste required for stitch formation is paid out from the thread spool, and the upper thread supply is stopped. When thread threading is carried out with the thread take-up lever rising to the highest position, the amount of thread is too large and the thread line is We will identify problems that may lead to poor performance.

[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、自動糸調子可能な本縫ミシンにおいて、
糸取りバネをなくすことによって、縫針の目礼がベッド
面近傍へ降下する時点において上糸供給路の距離が常に
一定となるようにして、縫目形成に必要な糸足が糸駒か
ら確実に繰出され、また、天秤の上昇の際、糸余りから
糸線り不良等が起こることを防止することができる自動
糸調子可能な本縫ミシンを提供することにある。
[Object of the Invention] The present invention was made to solve the problems of the conventional art, and its purpose is to provide a lockstitch sewing machine capable of automatic thread tension.
By eliminating the thread take-up spring, the distance of the needle thread supply path is always constant when the sewing needle descends near the bed surface, and the thread necessary for stitch formation is reliably paid out from the thread spool. Another object of the present invention is to provide a lockstitch sewing machine capable of automatic thread tension, which can prevent thread thread defects from occurring due to excess thread when the thread take-up is raised.

[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、布送り部材の
布送り運動と少なくとも部分的に単なるように決定され
た時点にて始まり、縫針の目孔がベッド面近傍へ降下す
る時点で終了する特定の期間の間、上糸の最大系取上但
をル゛「保するために縫針の上下動と調時して作動する
糸4Tr保手段と、布送り部材の布送り運動に伴って糸
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
のの糸供給停止手段が前記特定の期間の間上糸の供給路
を許可するために、縫目形成に影響を与える要因に従っ
て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備え
ている。
SUMMARY OF THE INVENTION In order to achieve the foregoing objects, the present invention provides a cloth feeding movement of a cloth feeding member, starting at a point at least partially determined simply as the eye of the sewing needle. a thread 4Tr retaining means that operates in synchronization with the vertical movement of the sewing needle to maintain the maximum thread pick-up of the upper thread for a specific period of time that ends when the needle thread descends near the bed surface; A thread supply stop means that operates to stop the supply of needle thread freely drawn out from the thread supply source toward the thread take-up body as the cloth feed movement of the cloth feed member; timed with the up and down movement of the sewing needle to control the activation time and activation period of the thread feed stop means according to factors affecting stitch formation to allow the upper thread feed path during said specific period; operative control means.

[作用] 前述のように構成された自動糸調子可能な本縫ミシンに
おいては、縫針の目孔がベッド面近傍へ降下する時点で
は、糸確保手段は上糸の最大系取上但を確保しており、
制御手段は糸供給停止手段が上糸の供給を許可するよう
に制御しているため、上糸供給路の距離が一定となる。
[Function] In the lockstitch sewing machine configured as described above and capable of automatic thread adjustment, the thread securing means secures the maximum thread pick-up when the eye of the sewing needle descends to the vicinity of the bed surface. and
Since the control means controls the thread supply stop means to permit supply of the upper thread, the distance of the upper thread supply path is constant.

[実施例1 以下、本発明の実施例を図面に基いて説明する。[Example 1 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
りでの糸!9116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及び押え俸18が挿着され、この針
棒10とその下端の縫針12とは後)小のようにミシン
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 section 6 extending leftward from the upper end is arranged horizontally so as to face above the bed section 2, and the upper surface of the arm section 6 is provided with a thread supply source. 9116 is installed. A head 8 is provided at the left end of the arm 6. A needle bar 10 and a presser foot 18 are inserted into the head 8, and the needle bar 10 and the sewing needle 12 at the lower end thereof are driven up and down by a sewing machine main shaft 28 as shown in the rear), and are also oscillated (not shown). It is driven to swing left and right by a moving mechanism. 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は重送り部材に相当し、針
棒10と乍送り機構の送り歯との協動により加工布に所
定の縫目が形成されることになる。前記重送り機構は既
存の一般的な(育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 double feed member, and a predetermined stitch is formed on the workpiece cloth by cooperation between the needle bar 10 and the feed dog of the feed mechanism. The double feeding mechanism is similar to the existing general (developed) mechanism, 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【プられた内部機構を示すものであ
る。
2 to 4 show the internal mechanism installed in the head 8 of the sewing machine M and the arm 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28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, thereby allowing the needle bar 10 to swing from side to side about the pin 26 together with the needle bar support 24. 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1゛8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は図示外の別溝により機枠に
挿着され、上昇位置と下降位置とに互って位買切換えさ
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 20 is detachably attached to the lower end of the presser bar 1-8, and the presser foot 18 is inserted into the machine frame through a separate groove (not shown), and is positioned alternately in the raised position and the lowered position. When the presser foot 20 is switched to the lowered position, the work cloth is pressed against the throat plate 22 by the presser foot 20.

次に天秤Bi MMについて第2図〜第4図により説明
する。
Next, the balance Bi MM 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
は枠に回転自在に挿着され、この主軸28の斜め上の1
多方には副軸34が主軸28と平行に配設され、この副
1IiIb34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の一喘部が回動自在に連結
され、この揺動レバー36は副i!’1l134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3
6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 frame via a bushing metal 32, etc.
A sub-shaft 34 is arranged parallel to the main shaft 28 on many sides, and this sub-shaft 1IiIb 34 is rotatably inserted into the machine frame. A pant portion of a swinging lever 36 is rotatably connected to this secondary shaft 34, and this swinging lever 36 is connected to the secondary shaft 34. The crank pin 40 of the balance crank 38 is connected to the swing lever 3
It extends through the elongated cam hole 42 of No. 6. This cam hole 42 and the swing bar 36 constitute 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40の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428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36’aで補強
されている。
As shown in FIGS. 2 and 3, the cam hole 42 of the swing lever 36 has the same radius as the rotation locus of the crank pin 40, and the crank pin '40 near the uppermost position is about 74 mm.
It is formed of an arcuate hole 428 that allows rotation through the cam hole 428 and a short straight hole 42b that extends straight from both ends of the arcuate hole 42a, and the outer periphery of this cam hole 42 is reinforced with a reinforcing portion 36'a.

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
か主軸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
っで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
When the swing lever 36 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1lll111
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 above-mentioned circular arc hole 42a is formed in a part of the cam hole 42 of the swing lever 36, the main 1llll111
The movement of the thread take-up 48 using the rotational phase angle of 28 as a parameter is as shown by the curve MA in FIG. 5, and the movement of the sewing needle 12 attached to the lower end of the needle bar 10 is as shown in the curve MB in FIG. The horizontal direction feeding motion of the feed dog 23 of the cloth feeding mechanism is the fifth
It will look like the broken line MD in the figure.

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12の目礼か針板22の上面に達する時ま
で最上位置に保持される。従って、15送りの初期の段
階を除ぎ在送りが実′X1的に実行される期間には天秤
48が最下位置に保持されている。但し、天秤4Bはイ
「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の溝道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 sewing needle 12 reaches the upper surface of the throat plate 22. Therefore, except for the initial stage of the 15th feed, the balance 48 is held at the lowest position during the period in which the current feed is actually executed. However, the swing lever 36 may be configured so that the balance 4B is located at the uppermost position from the start of feeding.In any case, the groove path of the swing lever 36 in this embodiment is relatively simple. Therefore, while the thread take-up lever 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 thread take-up 48 is always the same. It becomes constant.

次に糸通過制御機構について第2図〜第7図により説明
する。
Next, the yarn passage control mechanism 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f’1l128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 50, which is a part of the machine frame, is provided perpendicularly to the main shaft 128. As shown in FIGS. 2 and 3, at a position slightly forward of the main shaft 28, on the left side of the plate member 50 is a britension device 52 that can provide passing resistance to the needle thread 14.
will be provided as necessary.

このブリテンション装置52は1対の糸調子皿52aの
間に上糸を通過させ、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52は省略
してもよい。
This britension device 52 allows the upper thread to pass between a pair of thread tension discs 52a, and by rotating a dial, the spring force can be adjusted to adjust the thread passing resistance. This britension device 52 may be omitted.

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置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か糸道規制板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1q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5
6a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の上端の接触幅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648が形成され、可動輪6
4の上半部のV溝64aが糸道規制板56の規制部56
aに係合し、このV溝648と規制部56aとの間に上
糸14が挟持拘束されるようになっている。
A yarn path regulating plate 56 is fixed to the left side of the plate member 50 at a position below the britension device 52, and a movable plate 58 and a link arm as a release member are arranged near the left side of the yarn path regulating plate 56. 60 and the stepped screw 62
The upper thread 14 is rotatably connected to the plate member 50, and comes into contact with the movable ring 64 of the movable plate 58 or the regulating part 56a of the thread path regulating plate 56 from below, so that the upper thread 14 is connected between the regulating part 56a and the movable ring 64. It is arranged so that it is clamped and restrained. The movable ring 64 corresponds to a release member, and the movable plate 58 has a movable ring 64 that corresponds to a release member.
6a, the contact width 68 of the upper end of the arm portion 58a of the movable plate 58 is elastically biased by a spring 66 as an elastic body.
is in contact with the contact portion 60a near the lower end of the link arm 60 from the front. As shown in FIGS. 3 and 7, an annular V-groove 648 is formed on the circumferential surface of the movable ring 64.
The V groove 64a in the upper half of 4 is the regulating portion 56 of the yarn path regulating plate 56.
a, so that the needle thread 14 is clamped and restrained between this V-groove 648 and the regulating portion 56a.

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lNl34に固着さ
れた第17−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N134と共に制御手段を’lFS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 rotary cam 70 having an elliptical cam groove 72 is fixed to the main shaft 28, and a contact 74a at the tip of the 17th cam 74 fixed to the sub lNl34 is attached to the cam groove 72.
is engaged in. The cam groove 72 corresponds to a cam body, and the first arm 74 and the sub-N134 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
のルースピン穴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で接触幅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の弾性力で回動じ可動輪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 width 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 is rotated by the elastic force of the spring 66, and the movable ring 64 is moved to the restricting 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 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が最上位置から最上位
置まで上界していく上糸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
の引締めか確実に実行される。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!9116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に達ターる時期までには上糸14が■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、侑送り
と針振りのために浦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 upper thread 14 as it moves upward from the uppermost position to the uppermost position, the upper thread 14 is restrained by the thread passage control device 54.
The 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 the restriction by the thread passage control device 54 is released, and the necessary amount of upper thread 14 is delivered to the thread! 9116 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 stretched and restrained. The sewing operation is performed while the thread 14 is restrained, and an upper thread loop is formed on the lower thread bobbin side. Therefore, the necessary amount of needle thread 14 that is expended for thread 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F1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て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 by the curve MC in FIG. 5, due to the restraining characteristics determined by the elliptical shape of the cam groove 72 of the rotating cam 70, in the case of a thin needle thread 14, it is released at the point F1 and 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!9J
 16から所定足の上糸14を繰出して貯えておく糸繰
出し開溝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 swings downward and the needle thread 14 is restrained by the movable ring 64 and the thread path regulating plate 56, the thread! 9J
The thread letting-out groove 78 for letting out and storing a predetermined number of needle threads 14 from the needle thread 16 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11h34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8
4b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888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の俊端部は上糸1
4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 the sub 11h34 that supports one end of the swing lever 36, and one end of the swing lever 36 is fixed to the sleeve 80. An actuation arm 82, which has a crank shape when viewed from the side, is fixed to the sleeve 80, and a hook-like thread catcher 82a is formed at the tip of the actuation 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. A first guide plate 8 extending vertically downward
4b and a second guide plate 84C, and by fixing the second guide plate 84C of this thread guide 84 to the upper end of the plate member 50 with screws 86, the thread guide 84 is attached to the machine frame, and this thread The guide body 84 is disposed near the top of the actuating arm 82 . The first guide plate 84b and the second guide plate 84C face each other with a predetermined pressure apart in the left-right direction, and the first guide plate 84b
A first guide groove 888 and a second guide groove 88b are formed on the second guide plate 84C so as to face each other laterally, and the short ends of the first and second guide grooves 88a and 88b are connected to the upper thread 1.
It has been released to introduce 4. Furthermore, a third guide groove 90 cut out from above is formed in the front end of the left second guide plate 84C.

糸rA16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84Gの左側面から第
3案内W490へ屈曲状に導入され、この第3案内溝9
0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 needle thread 14 extending from the thread rA16 is introduced into the third guide W490 from the left side of the second guide plate 84G in a bent manner through the first guide groove 88a and the second guide groove 88b, and is introduced into the third guide W490 in a bent manner.
0 to the yarn path regulating plate 56 via the britension device 52.
The regulating portion 56a of the thread path regulating plate 56 is bent upward at the bent portion between the thread guide portion 56a and the movable ring 64, and the thread guide portion is bent from the bent portion to the thread holding portion 48a at the tip of the thread take-up lever 48. It extends to the eye hole of the sewing needle 12 via 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が最下位置にある間、作動アー
ム82は点線で図示のように第1及び第2案内溝888
・88b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82aが第1及び第2案内溝88a・88bの前端部
間に厘る上糸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1
4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16から所定口の上糸か確実に繰出
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 connected to the main shaft 28 via the balance crank 38.
However, while the balance 48 is at the lowest position as shown by the solid line in FIG. Guide groove 888
- Located behind the upper thread 14 passing through the tip of 88b,
Further, when the lever 36 swings around the secondary shaft 34 when the balance 48 descends to the lowest position as shown by the imaginary line, the actuating arm 82 also swings around the secondary shaft 34 as shown by the imaginary line. The actuating arm 82 swings forward, and the thread catcher 82a at the tip of the actuating arm 82 moves forward so as to intersect the needle thread 14 disposed between the front ends of the first and second guide grooves 88a and 88b. At this time, the needle thread 1 is
4 will be delivered forward a predetermined distance. During this unwinding, the upper thread 14 is restrained by the thread path regulating plate 56 and the movable ring 64, so that only the upper thread at a predetermined opening 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
)ホのように天秤48が上昇していって上糸14の引き
締めが実行され、その1多糸通過制御装置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4Bと0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 upper thread 14 is loosened, the thread take-up 48 is raised as shown in (e) above to tighten the upper thread 14, and the restriction by the multi-thread passage control device 54 is released. The required amount of upper thread 14 is supplied to the thread take-up 4B and the zero needle 12 through the thread passage control device 54 by the cloth feeding operation by the feed dog and the needle swinging operation.

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の弾性的伸び足
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 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m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 restraint and release of the needle thread 14 is automatically controlled according to the thickness of the needle thread 14, and the necessary m of needle thread 14 determined by the cloth feed amount and needle swing amount is sequentially and reliably replenished. 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) 前記糸案内体84の第2案内体84Gに対する
第1案内板84bの左右位置を調節可能に溝成し、糸繰
出し量を調節可能に構成する。
(1) A groove is formed so that the left and right position of the first guide plate 84b with respect to the second guide body 84G of the thread guide body 84 can be adjusted, so that the amount of yarn delivered can be adjusted.

(2) 前記糸通過制御装置54における可動輪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) The mechanism for driving the movable wheel 58 in the thread passage control device 54 is constituted by an electric actuator, and the drive is 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挾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 needle 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、縫ヱ1の目孔がベッド
面近傍へ降下する時点において、糸確保手段が上糸の最
大系取上口を確保し、糸供給停止手段が上糸の供給を許
可するように制御されているため、天秤と糸調子皿との
間の上糸供給路中に上糸をたぐるための糸取りバネを設
ける必要がなく、縫針の目孔がベッド面近傍へ降下する
時点で上糸供給路の距離を常に一定にすることができる
ため、縫目形成に必要な糸量が糸駒から確実に繰出され
、美麗な縫目を形成することができる。また、天秤が上
昇する際に天秤の必要とする糸足が確実に糸駒から繰出
されているため、天秤の上昇時における糸繰り不良等を
防止することができる。
[Effects of the Invention] As described in detail above, in the present invention, the thread securing means secures the maximum pick-up opening for the needle thread at the time when the eye hole of the stitch 1 descends to the vicinity of the bed surface, and the thread supply Since the stop means is controlled to allow the supply of the needle thread, there is no need to provide a thread take-up spring for pulling the needle thread in the needle thread supply path between the thread take-up lever and the thread tension disc, and the sewing needle eye Since the distance of the needle thread supply path can always be kept constant when the hole descends near the bed surface, the amount of thread necessary for stitch formation is reliably fed out from the thread spool, forming beautiful stitches. be able to. In addition, since the thread thread required by the thread take-up is reliably fed out from the thread spool when the thread thread take-up is raised, it is possible to prevent thread take-up failures and the like when the thread thread take-up is raised.

【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151前記内部改1rrMの正面図、第
5図は前記ミシンの各は構の動作を示すタイムヂャート
、第6図は第3図のVl−Vl線断面図、第7図は第4
図のVI −VM線断面図である。 12:縫針、14:上糸、16:糸駒、23:送り園、
28:ミシン主軸、34:副軸、36:揺動レバー、4
2:カム孔、48:天秤、54:糸通過制御装量、60
:リンクアーム、64:可動輪、66:バネ、72:カ
ム満、74:第1アーム
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. A side view of the internal mechanism, FIG. 4 is a front view of the internal modification 1rrM, 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 of FIG. 3, Figure 7 is the 4th
It is a sectional view taken along the line VI-VM in the figure. 12: sewing needle, 14: upper thread, 16: thread spool, 23: sending garden,
28: Sewing machine main shaft, 34: Subshaft, 36: Swing lever, 4
2: Cam hole, 48: Balance, 54: Yarn passage control amount, 60
: Link arm, 64: Movable ring, 66: Spring, 72: Cam full, 74: First arm

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)がベッド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、上糸(14)が最大糸弛み量
まで弛む第1の位置と上糸(14)が最大糸取上量まで
取上げられる第2の位置との間にて移動可能な糸取上体
(48)と、糸供給源(16)から糸取上体(48)を
介して縫針(12)の目孔に至る上糸供給路とを備え、
加工布中に上糸(14)と下糸との結接点を形成する本
縫ミシンにおいて、 前記布送り部材(23)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
(12)の目孔がベッド面近傍へ降下する時点で終了す
る特定の期間の間、前記最大糸取上量を確保するために
前記縫針(12)の上下動と調時して作動する糸確保手
段(36、42)と、 前記布送り部材(23)の布送り運動に伴って前記糸供
給源(16)から糸取上体(48)に向かって自由に引
出される上糸(14)の供給を停止させるために作動す
る糸供給停止手段(54)と、 その糸供給停止手段(54)が前記特定の期間の間上糸
(14)の供給を許可するように、縫目形成に影響を与
える要因に従って糸供給停止手段(54)の作動時点及
び作動期間を制御するために縫針(12)の上下動と調
時して作動する制御手段(34、74)とを備え、 前記縫針(12)の目孔がベッド面近傍へ降下する時点
において前記上糸供給路の距離を一定となるように構成
したことを特徴とする自動糸調子可能な本縫ミシン。 2、前記糸供給停止手段(54)は、前記糸供給源(1
6)と糸取上体(48)との間に設けられた糸挾持部材
(64)と、その糸挾持部材(64)により上糸(14
)が挾持されるように糸挾持部材(64)を常時付勢す
る弾性体(66)と、糸挾持部材(64)による上糸(
14)の挾持を弾性体(66)の作用に抗して解除する
ためにミシンの主軸(28)と共に回転するカム体(7
2)により作動される解除部材(60)とを含むことを
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、前記糸確保手段(36、42)は、前記糸取上体(
48)を前記特定の期間の間前記第2の位置に停止させ
、その特定の期間以外の期間縫針(12)の上下動と調
時して移動させるための糸取上体駆動手段(36、42
)であ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。
[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 bed surface; A thread take-up body (48) movable between a first position where the needle thread (14) is loosened to the maximum thread slack amount and a second position where the needle thread (14) is picked up to the maximum thread pick-up amount. and an upper thread supply path leading from the thread supply source (16) to the eye hole of the sewing needle (12) via the thread take-up body (48),
In a lockstitch sewing machine that forms a knot between an upper thread (14) and a bobbin thread in a workpiece cloth, the sewing machine starts at a time determined to at least partially overlap with the cloth feeding movement of the cloth feeding member (23). , in synchronization with the vertical movement of the sewing needle (12) to ensure the maximum amount of thread taken up during a specific period that ends when the eye of the sewing needle (12) descends near the bed surface. a yarn securing means (36, 42) that operates; a thread supply stop means (54) operative to stop the supply of the thread (14), such that the thread supply stop means (54) permits the supply of the needle thread (14) for said specified period of time; control means (34, 74) operating in synchronization with the vertical movement of the sewing needle (12) to control the activation time and activation period of the thread supply stop means (54) according to factors affecting stitch formation; A lockstitch sewing machine capable of automatic thread tension, characterized in that the distance of the upper thread supply path is constant at the time when the eye of the sewing needle (12) descends to the vicinity of the bed surface. 2. The yarn supply stop means (54) stops the yarn supply source (1
6) and the thread take-up body (48), and the thread clamp holding member (64) holds the upper thread (14).
), and an elastic body (66) that constantly biases the thread clamping member (64) so that the upper thread () is clamped by the thread clamping member (64).
The cam body (7) rotates together with the main shaft (28) of the sewing machine in order to release the clamping of the sewing machine (14) against the action of the elastic body (66).
2) A lockstitch sewing machine capable of automatic thread tension as claimed in claim 1, characterized in that the lockstitch sewing machine includes a release member (60) operated by the lockstitch sewing machine according to claim 1. 3. The thread securing means (36, 42) is connected to the thread take-up body (
thread take-up body driving means (36, 42
) A lockstitch sewing machine capable of automatic thread tension according to claim 1.
JP10702587A 1987-04-30 1987-04-30 Automatic thread tension adjustable main sewing machine Pending JPS63272388A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10702587A JPS63272388A (en) 1987-04-30 1987-04-30 Automatic thread tension adjustable main sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10702587A JPS63272388A (en) 1987-04-30 1987-04-30 Automatic thread tension adjustable main sewing machine

Publications (1)

Publication Number Publication Date
JPS63272388A true JPS63272388A (en) 1988-11-09

Family

ID=14448609

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10702587A Pending JPS63272388A (en) 1987-04-30 1987-04-30 Automatic thread tension adjustable main sewing machine

Country Status (1)

Country Link
JP (1) JPS63272388A (en)

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