JPH0866Y2 - Structure of automatic thread tensioner in sewing machine - Google Patents
Structure of automatic thread tensioner in sewing machineInfo
- Publication number
- JPH0866Y2 JPH0866Y2 JP1990078431U JP7843190U JPH0866Y2 JP H0866 Y2 JPH0866 Y2 JP H0866Y2 JP 1990078431 U JP1990078431 U JP 1990078431U JP 7843190 U JP7843190 U JP 7843190U JP H0866 Y2 JPH0866 Y2 JP H0866Y2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- roller
- sewing machine
- yarn
- feeding roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Sewing Machines And Sewing (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案はミシンにおける上糸制御技術に係り、殊に二
つのローラ間で上糸を挾持しながら該ローラを回動制御
して上糸の繰り出し量を制御するミシンの糸繰り出し部
で、糸の外れを防止することができるミシンにおける自
動糸調子器の構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a needle thread control technique in a sewing machine, and in particular, the needle thread is clamped between two rollers while the rollers are rotationally controlled to control the needle thread. The present invention relates to a structure of an automatic thread tensioner in a sewing machine, which can prevent the thread from coming off at a thread delivery section of a sewing machine that controls the delivery amount.
従来より上糸の繰り出し量を設定値に合わせて自動制
御するミシンの自動糸調子器として第５図に示す構造の
ものが使用されている。この種の自動糸調子器51は図示
しないミシンに装着された糸コマと天秤間の糸道に構成
され、図示しない駆動源により回転する主軸に連動する
回転駆動伝達手段を介して主軸によって回転駆動する円
柱状の繰り出しローラ13に対して押えローラ17を図示し
ないミシンアームに軸支された操作レバーの操作によっ
て矢印Ａ方向に離接自在な構成になっており、上糸ａは
両ローラ13,17間に挾持されながら繰り出しローラ13の
回転角によって繰り出されるため、繰り出しローラ13に
回転を伝達する回転駆動伝達手段等を制御することによ
って望ましい上糸ａの供給量を確保することができる。Conventionally, an automatic thread tensioner having a structure shown in FIG. 5 has been used as an automatic thread tensioner for a sewing machine that automatically controls the amount of the upper thread fed out according to a set value. This type of automatic thread tensioner 51 is configured in a yarn path between a thread top mounted on a sewing machine (not shown) and a thread take-up, and is rotationally driven by a main shaft via a rotary drive transmission means that is interlocked with a main shaft rotated by a drive source (not shown). The pressing roller 17 is detachable and contactable in the direction of arrow A with respect to the cylindrical feeding roller 13 by operating an operation lever pivotally supported by a sewing machine arm (not shown). Since the yarn is fed by the rotation angle of the feeding roller 13 while being held between 17, it is possible to secure a desired supply amount of the upper thread a by controlling the rotation drive transmission means or the like for transmitting the rotation to the feeding roller 13.
しかし上記自動糸調子器51の構成では、繰り出しロー
ラ13の傾き、繰り出しローラ13の形状及び糸道経路等の
構造的原因により、上糸ａが上下・前後にあばれて繰り
出しローラ13と押えローラ17間から上糸ａが外れ上糸ａ
の制御供給が不能となることがある。また操作レバーを
上または下に回動させることにより繰り出しローラ13か
ら押えローラ17が後退離間する（押えローラ17が第５図
（ａ）の右方向に動く）機構になっているため、糸の撓
み癖等に起因して「ヨレ（糸がローラの上下方向に遊
ぶ）」等を生じ、繰り出しローラ13から外れる問題を有
していた。However, in the structure of the above-mentioned automatic thread tensioner 51, the upper thread a is vertically moved up and down and back and forth due to structural factors such as the inclination of the feeding roller 13, the shape of the feeding roller 13 and the yarn path, etc. The upper thread a comes off from between and the upper thread a
The control supply of may become impossible. Further, by rotating the operation lever up or down, the pressing roller 17 is retracted and separated from the feeding roller 13 (the pressing roller 17 moves to the right in FIG. 5 (a)). There is a problem that "slip (thread plays in the vertical direction of the roller)" or the like is caused due to a bending tendency and the like, and the thread comes off the delivery roller 13.
本考案は上記問題に鑑みてなされたものであり、回転
駆動伝達手段によって回転駆動する繰り出しローラと押
えローラ間に上糸を挾持しながら供給量を制御する自動
糸調子器において、上糸が両ローラから外れることがな
く、且つ糸の掛け込みが容易なミシンにおける自動糸調
子器の構造を提供することを目的とするものである。The present invention has been made in view of the above problems, and in an automatic thread tensioner that controls the supply amount while holding the upper thread between the feeding roller and the pressing roller that are rotationally driven by the rotational driving transmission means, An object of the present invention is to provide a structure of an automatic thread tensioner in a sewing machine in which a thread does not come off from a roller and a thread can be easily hooked.
本考案に係るミシンにおける自動糸調子器の構造は、
ミシン主軸に連動すると共に、回動可能に支持された繰
り出しローラ（13）と、この繰り出しローラに接離可能
な押えローラ（17）と、前記繰り出しローラの回動を制
御する駆動制御手段（40）と、を備え、前記両ローラ間
に糸供給源からの糸を挟持して、糸供給量を制御するミ
シンの自動糸調子器において、 前記押えローラに支持されると共に、糸供給源側の糸
を前記ローラの軸方向の所定範囲に案内するアンダーカ
ット形状の糸外れ防止手段（24）と、前記両ローラから
針への糸道経路を開閉可能な糸掛けミス防止機構（45）
と、前記押えローラと前記糸掛けミス防止機構を連動さ
せる操作レバー（６）と、を備え、 前記操作レバーの回動により、押えローラの接離と糸
掛けミス防止機構の開閉とを同時に行うようにした。The structure of the automatic thread tension device in the sewing machine according to the present invention is as follows.
A feeding roller (13) that is rotatably supported while being linked to the main shaft of the sewing machine, a pressing roller (17) that can come into contact with and separate from the feeding roller, and a drive control means (40) that controls the rotation of the feeding roller. ), And an automatic thread tensioner of a sewing machine that clamps the thread from the thread supply source between the rollers to control the thread supply amount, and is supported by the pressing roller and An undercut thread disengagement prevention means (24) for guiding the thread to a predetermined range in the axial direction of the roller, and a threading mistake prevention mechanism (45) capable of opening and closing the thread path from the rollers to the needle.
And an operating lever (6) for interlocking the presser roller and the threading mistake prevention mechanism, and by rotating the operation lever, the pressing roller is brought into and out of contact with the threading mistake prevention mechanism at the same time. I did it.
上記自動糸調子器は、上糸を常時押えローラ支持腕に
構成した糸外れ防止手段の糸挿入部で保持しているた
め、上糸を両ローラ間に挾んで繰り出すとき、糸を押え
ローラ側に寄せるように作用し、また糸の偏りを規制す
るため、両ローラ間からの脱落を阻止するようになり、
安定して上糸を供給する。In the above automatic thread tensioner, since the upper thread is always held by the thread insertion portion of the thread detachment preventing means formed on the pressing roller support arm, when the upper thread is sandwiched between the rollers and is fed out, the thread is held on the pressing roller side. It acts so as to move closer to the roller and regulates the deviation of the yarn, so that it is prevented from falling off from between both rollers,
Stable supply of needle thread.
また、操作レバーの正転により押えローラの離間と糸
掛けミス防止機構の開動作を同時に行い糸道を開放する
ので、糸掛け動作を速やかに行うことができる。Further, since the pressing roller is separated by the forward rotation of the operation lever and the yarn hooking error preventing mechanism is opened at the same time to open the yarn path, the yarn hooking operation can be performed quickly.
その後、糸供給源から両ローラの糸道経路にある糸
は、操作レバーの逆転により、繰り出しローラに対して
押えローラと糸外れ防止手段が接近し、自動的にアンダ
ーカット形状を有する糸外れ防止機構に案内される。After that, with respect to the yarns in the yarn path of both rollers from the yarn supply source, the pressing roller and the yarn disengagement prevention means come close to the payout roller by the reverse rotation of the operation lever, and the yarn disengagement prevention automatically having the undercut shape Guided by the mechanism.
以下、本考案に係るミシンにおける自動糸調子器の構
造の一実施例を図面に従って説明する。An embodiment of the structure of an automatic thread tensioner in a sewing machine according to the present invention will be described below with reference to the drawings.
第１図乃至第３図は自動糸調子器１の平面図，正面図
及び要部拡大図を示すものであり、該糸調子器１は第４
図に示すように、ミシン頭部２に装着された糸コマ（図
示せず）から天秤３に至る糸道に構成してあり、天秤３
を経た上糸ａを針棒の下端に取付けられるミシン針４に
供給してなるもので、ミシンの主軸５の回転を駆動源と
すると共に、該ミシン頭部２の前面に枢設した操作レバ
ー６の回動（矢印Ｂ）操作によって上糸の掛け込みを行
うものである。1 to 3 are a plan view, a front view and an enlarged view of an essential part of the automatic thread tensioner 1, which is shown in FIG.
As shown in the drawing, the thread path from the thread top (not shown) attached to the sewing machine head 2 to the thread balance 3 is constituted.
The upper thread a passing through the sewing machine is supplied to the sewing machine needle 4 attached to the lower end of the needle bar, and the main shaft 5 of the sewing machine is used as a drive source and an operating lever pivotally provided on the front surface of the sewing machine head 2. The upper thread is hooked by rotating 6 (arrow B).
第５図はミシン頭部からの斜視図である。 FIG. 5 is a perspective view from the sewing machine head.
50は糸道で、ミシン頭部天板52に設けた切り欠け部に
より糸供給源（糸巻き）からの糸を図示しない針に導
く。この際、後述する操作レバー６の回動により、押え
ローラ17の離間と糸道閉塞部材47の開動作を同時に行い
糸道50を確保すると共に、糸外れ防止機構及び両ローラ
13、17間に確実に糸を案内する。A yarn path 50 guides a yarn from a yarn supply source (thread winding) to a needle (not shown) by a notch provided on the sewing machine head top plate 52. At this time, by rotating the operation lever 6 which will be described later, the pressing roller 17 is separated and the yarn path closing member 47 is opened at the same time to secure the yarn path 50, and the thread detachment prevention mechanism and both rollers are provided.
Make sure to guide the thread between 13 and 17.
符号７は自動糸調子器１の基台であり、ミシン頭部２
の機枠に固設してなる。13は、外周に歯部13aを施した
繰り出しローラであり、繰り出しローラ13はミシン頭部
２の下に位置するように基台７に架設した糸調子板15の
透孔から突出している。繰り出しローラ軸11は、繰り出
しローラばね受け10及び繰り出しローラ13に貫通してそ
の上軸をナット11aで螺着し、下端を従動ギアー11bを経
てその軸端を基台７に回動可能に支持される。繰り出し
ローラ軸ストッパ板９は、繰り出しローラ13と繰り出し
ローラばね受け10との間に狭着された円盤であり、繰り
出しローラ軸ストッパ板９の外周部はソレノイド８の可
動体8aとヨークの上部8bとの隙間に介在するようになっ
ている。そして、第４図に示す主軸５の回転は主軸駆動
ギアー5a及び第２図に示す基台７に軸設した複数の傘歯
車12（第２図において正面とその背後にそれぞれ１個）
と従動ギアー11bからなる回転駆動伝達手段により繰り
出しローラ軸11を回転させ繰り出しローラ13と押えロー
ラ17との共働により上糸ａを繰り出す。また、ソレノイ
ド８の励磁により繰り出しローラ軸ストッパ板９を狭持
して繰り出しローラ13と繰り出しローラばね受け10とを
強制的に回転停止させ繰り出しローラ13の回転を拘束す
る構成になる。そして、上記繰り出しローラ13,繰り出
しローラばね受け10,繰り出しローラ軸ストッパ板9,ソ
レノイド８等で駆動制御手段を構成している。また該基
台７上面には摺動板21の基端部21aに図示しない長孔を
設け、押えローラ支持腕18に立設した軸16を押えローラ
17に遊嵌しその軸端を基端部21aに軸設するとともに押
えローラ17を回動自在に軸設した押えローラ支持腕18の
基端部をピン軸19を介して回動自在に枢着し、押えロー
ラ17を矢印Ｃ方向に変位して繰り出しローラ13と離接自
在とする構成になる。上記押えローラ17を軸設した軸16
は基台７の上面に突設した突軸20,20が長孔22,22を介し
て摺動自在（矢印Ｄ方向）に配設された摺動板21と変位
方向に係合してなり、該摺動板21と基台７間に引っ張り
弾性付勢したコイルスプリング23によって常時押えロー
ラ17を繰り出しローラ13に押圧する方向に弾性付勢して
なる。また上記押えローラ支持腕18の回動端には糸外れ
防止手段24をこの部材と一体に構成してなるもので、該
糸外れ防止手段24は第３図に示すように、平面形状が押
えローラ17の外周に近接すると共に前側を囲む円弧状を
呈した板状からなり、鉤状先端25を有する上顎部26と該
上顎部26と対向する下顎部27によってアンダーカット構
造28をもった糸挿入部29を構成してなる。更に符号30は
基台７の上面に突設した突軸31,31に長孔32,32を摺動自
在（矢印Ｅ方向）に配設した連結摺動板であり、該連結
摺動板30は螺子33を介して出退位置（矢印Ｅ方向）調節
自在に締結した逃げ量調節部材34を介して前記摺動板21
の後端と離接してなる。該連結摺動板30の後端部は支点
部を基台７にピン軸35を介して枢着した梃子腕36の揺動
端と変位方向に係合すると共に、該梃子腕36の作用端に
設けたピン37を前記ミシン頭部２の前面に枢設した操作
レバー６を軸設してなる操作軸38に軸設した揺動カム39
と摺接し、操作レバー６の回動（矢印Ｂ）操作により連
結摺動板30を矢印Ｅ方向に変位せしめてなる。また符号
40は前記駆動制御手段の繰り出しローラばね受け10側に
軸着したエンコーダの回転位置検出盤であり、該回転位
置検出盤40には円周方向当間隔に放射状のスリットが形
成してあり、該盤の両面に対置したホトインタラプタ42
を検出部とした回転角度検知手段を構成すると共に、該
検知出力によりプリント基盤43に配置した増幅部44を介
して図示しない中央処理装置（CPU）の電気信号により
駆動制御手段を制御して繰り出しローラ13を断続回転せ
しめる。Reference numeral 7 is a base of the automatic thread tension device 1, and a sewing machine head 2
It is fixed to the machine frame. Reference numeral 13 denotes a feeding roller having a tooth portion 13a on its outer periphery, and the feeding roller 13 projects from a through hole of a thread tension plate 15 provided on the base 7 so as to be located below the sewing machine head 2. The pay-out roller shaft 11 penetrates the pay-out roller spring receiver 10 and the pay-out roller 13, has its upper shaft screwed with a nut 11a, and has its lower end rotatably supported on the base 7 via a driven gear 11b. To be done. The feeding roller shaft stopper plate 9 is a disk that is sandwiched between the feeding roller 13 and the feeding roller spring receiver 10, and the outer peripheral portion of the feeding roller shaft stopper plate 9 is a movable body 8a of the solenoid 8 and an upper portion 8b of the yoke. It is designed to intervene in the gap between and. The main shaft 5 shown in FIG. 4 is rotated by a plurality of bevel gears 12 axially installed on the main shaft drive gear 5a and the base 7 shown in FIG. 2 (one in each of the front face and the rear face in FIG. 2).
The feed roller shaft 11 is rotated by the rotation drive transmission means including the driven gear 11b and the feed roller 13 and the pressing roller 17 to feed the upper thread a. Further, the feeding roller shaft stopper plate 9 is sandwiched by the excitation of the solenoid 8 to forcibly stop the feeding roller 13 and the feeding roller spring receiver 10 from rotating, and the rotation of the feeding roller 13 is restricted. The delivery roller 13, the delivery roller spring receiver 10, the delivery roller shaft stopper plate 9, the solenoid 8 and the like constitute drive control means. Further, on the upper surface of the base 7, a long hole (not shown) is provided in the base end portion 21a of the sliding plate 21, and the shaft 16 standing on the press roller supporting arm 18 is pressed by the press roller.
The base end of a press roller support arm 18 which is loosely fitted to the base 17, the shaft end of which is axially mounted on the base end 21a, and the press roller 17 is pivotally mounted, is rotatably pivoted via a pin shaft 19. Then, the pressing roller 17 is displaced in the direction of the arrow C so that the pressing roller 17 can be moved into and out of contact with the feeding roller 13. Shaft 16 with the above presser roller 17
Is a projecting shaft 20, 20 projectingly provided on the upper surface of the base 7, which engages with a sliding plate 21 slidably (in the direction of arrow D) through a long hole 22, 22 in the displacement direction. The pressing roller 17 is constantly elastically urged in the direction in which it is pressed against the feeding roller 13 by the coil spring 23 that is pulled and elastically urged between the sliding plate 21 and the base 7. Further, a thread disengagement prevention means 24 is formed integrally with this member at the pivotal end of the pressing roller support arm 18, and the thread disengagement prevention means 24 has a planar shape as shown in FIG. A thread having an undercut structure 28 formed by an upper jaw portion 26 having a hook-shaped tip 25 and a lower jaw portion 27 facing the upper jaw portion 26, which is formed of a circular arc-shaped plate close to the outer periphery of the roller 17 and surrounds the front side. The insertion section 29 is configured. Further, reference numeral 30 is a connecting slide plate in which elongated holes 32, 32 are slidably (in the direction of arrow E) provided in projecting shafts 31, 31 provided on the upper surface of the base 7. Is a slide plate 21 via a relief amount adjusting member 34 which is fastened via a screw 33 so as to be adjustable in a retracted position (direction of arrow E).
It is separated from the rear end of. The rear end of the connecting slide plate 30 engages with the swing end of the lever arm 36 pivotally attached to the base 7 via the pin shaft 35 in the displacement direction, and the working end of the lever arm 36. A rocking cam 39 axially mounted on an operating shaft 38 formed by pivoting an operating lever 6 pivotally mounted on the front surface of the sewing machine head 2 with a pin 37 provided on the sewing machine head 2.
The sliding contact plate is slidably contacted, and the connecting slide plate 30 is displaced in the direction of arrow E by rotating the operation lever 6 (arrow B). Also sign
Reference numeral 40 denotes a rotary position detection plate of an encoder axially attached to the feeding roller spring receiver 10 side of the drive control means, and the rotation position detection plate 40 has radial slits formed at circumferential intervals. Photo-interrupter 42 facing both sides of the board
And a rotation angle detection means having a detection unit, and the drive output means is controlled by an electric signal from a central processing unit (CPU) (not shown) via an amplification unit 44 arranged on the printed board 43 by the detection output. Rotate roller 13 intermittently.
尚、符号45は自動糸調子器１に付随して構成した糸掛
けミス防止機構であり、基台７の端部に軸46を介して下
端部を回動自在に枢着した糸道閉塞部材47の下端に突設
した係合突起48と前記連結摺動板30の端部に突設した係
合突起49を操作レバー６の回動により矢印Ｆ方向に回動
し、常時は捩じりスプリング47aによって矢印Ｆと反対
方向に弾性付勢した構造になり、該糸道閉塞部材47の屈
曲した先端は、ミシンの頭部２に穿設した上糸落し込み
孔50を横断する位置と後退する位置に変位し、その後退
開放と前記押えローラ17の後退が同期する構成になる。
次に、本考案にかかわるミシンにおける自動糸調子器の
作用を説明する。Reference numeral 45 is a thread hooking error preventing mechanism that is formed in association with the automatic thread tensioner 1, and is a thread path closing member in which the lower end portion is pivotally attached to the end portion of the base 7 via a shaft 46. The engaging projection 48 projecting from the lower end of 47 and the engaging projection 49 projecting from the end of the connecting slide plate 30 are rotated in the arrow F direction by the rotation of the operation lever 6 and are normally twisted. The spring 47a has a structure in which it is elastically biased in the direction opposite to the arrow F, and the bent tip of the yarn path closing member 47 crosses the upper thread drop hole 50 formed in the head portion 2 of the sewing machine and moves backward. The pressing roller 17 is displaced to the position where the pressing roller 17 is retracted and the backward opening is synchronized.
Next, the operation of the automatic thread tension device in the sewing machine according to the present invention will be described.
上記構成になる自動糸調子器１は操作レバー６の回動
によって上糸ａの挾み込みが可能となる。操作レバー６
を回動すると、操作軸38に軸着した揺動カム39が回動し
て梃子腕36を回動させ、これによって連結摺動盤30及び
逃げ量調節部材34が第１図のＥ方向（右方向）に摺動し
て摺動板21を押圧するから、摺動板21は右方に摺動して
移動する。これにより、摺動板21及び軸16を介して押え
ローラ17を繰り出しローラ13から離間後退してなる。こ
のとき該押えローラ17は押えローラ支持腕18により矢印
Ｃの軌跡に添って変位し、糸外れ防止手段24の鉤状先端
25が上糸ａの糸道から後退する。また上記連結摺動板30
が右方向に変位すると糸掛けミス防止機構45の糸道閉塞
部材47が矢印Ｆ方向に回動して上糸落し込み孔50から後
退し、糸道を開放する。In the automatic thread tensioner 1 having the above structure, the upper thread a can be caught by the rotation of the operation lever 6. Operating lever 6
When is rotated, the swing cam 39 pivotally attached to the operation shaft 38 is rotated to rotate the lever arm 36, whereby the connecting slide plate 30 and the escape amount adjusting member 34 are moved in the direction E (see FIG. 1). Since it slides in the right direction and presses the slide plate 21, the slide plate 21 slides and moves to the right. As a result, the pressing roller 17 is separated and retracted from the feeding roller 13 via the sliding plate 21 and the shaft 16. At this time, the presser roller 17 is displaced along the locus of the arrow C by the presser roller supporting arm 18, and the hook-like tip of the thread detachment preventing means 24.
25 is retracted from the thread path of the upper thread a. In addition, the above connecting sliding plate 30
When is moved to the right, the yarn path closing member 47 of the yarn hooking mistake prevention mechanism 45 rotates in the direction of the arrow F and retracts from the upper thread drop hole 50 to open the yarn path.
この状態から上糸ａを落し込むと、上糸ａは繰り出し
ローラ13と押えローラ17間に落ちこみ糸調子板15上に位
置する。次に操作レバー６不作動位置にすると、各部材
は前述と反対に変位し、コイルスプリング23の引っ張り
弾性によって押えローラ17が繰り出しローラ13に圧接さ
れる。このとき糸外れ防止手段24は鉤状先端25を糸道に
進入させ、該先端部で糸挿入部29に滑り込ませるように
作用し、上糸ａは該糸挿入部29を経て両ローラ13,17間
に挾持され、この状態で縫製を開始すると主軸５と回転
駆動手段及び駆動制御手段を介して繰り出しローラ13が
回転駆動され、上糸ａが繰り出される。而してCPUから
の指令に基づき繰り出しローラ軸11の予め定められた回
転角度をホトインタラプタ42によって検出し、この所定
の回転角度の間を駆動制御手段すなわち繰り出しローラ
軸ストッパ板９をソレノイド８により拘束することによ
り繰り出しローラ13を制動することによって糸の繰り出
し量を適正に制御することができる。When the upper thread a is dropped from this state, the upper thread a falls between the feeding roller 13 and the pressing roller 17 and is positioned on the thread tension plate 15. Next, when the operation lever 6 is moved to the inoperative position, each member is displaced in the opposite direction to the above, and the pressing elasticity of the coil spring 23 causes the pressing roller 17 to come into pressure contact with the feeding roller 13. At this time, the thread detachment preventing means 24 acts so that the hook-shaped tip 25 enters the thread path and slides into the thread insertion portion 29 at the tip portion, and the upper thread a passes through the thread insertion portion 29 and both rollers 13, When it is clamped between 17 and sewing is started in this state, the feeding roller 13 is rotationally driven by the main shaft 5, the rotation driving means and the drive control means, and the upper thread a is fed. Then, a predetermined rotation angle of the feeding roller shaft 11 is detected by the photo interrupter 42 based on a command from the CPU, and the drive control means, that is, the feeding roller shaft stopper plate 9 is operated by the solenoid 8 during the predetermined rotation angle. By restraining and braking the feeding roller 13, the feeding amount of the yarn can be properly controlled.
上記糸外れ防止手段24の構成では操作レバー６の上下
の回動により繰り出しローラ13から押えローラ17が離れ
るとき、上糸ａを上顎部26のアンダーカット構造28に糸
を掛け、押えローラ17に糸を寄せるようにして糸の外れ
を防止するように作用する。また、上記実施例におい
て、操作レバー６の回動により摺動板21が基台７上を第
１図に示すように直線摺動して摺動板21の基端部21aに
軸16が変位方向に係合して押えローラ17が繰り出しロー
ラ13から離間する構成であるが、操作レバー６の回動に
より摺動板21が曲線摺動して軸16を変位方向に回動して
も同様の効果を奏する。According to the structure of the thread detachment preventing means 24, when the pressing roller 17 is separated from the feeding roller 13 by the vertical rotation of the operation lever 6, the upper thread a is hooked on the undercut structure 28 of the upper jaw portion 26, and the pressing roller 17 is pressed. It acts to pull the thread close and prevent it from coming off. Further, in the above-mentioned embodiment, the rotation of the operation lever 6 causes the sliding plate 21 to linearly slide on the base 7 as shown in FIG. 1, and the shaft 16 is displaced to the base end portion 21a of the sliding plate 21. Although the pressing roller 17 is separated from the feeding roller 13 by engaging in the direction, the sliding plate 21 is curvedly slid by the rotation of the operation lever 6 and the shaft 16 is rotated in the displacement direction. Produce the effect of.
以上述べたように本考案に係るミシンにおける自動糸
調子器の構造は、上糸を常時押えローラ支持腕と一体に
構成した糸外れ防止手段の糸挿入部で保持しているた
め、糸の脱落が少ない。また上糸を両ローラ間に挾んで
繰り出すとき、糸外れ防止手段が糸を押えローラ側に寄
せるように作用するため、糸の偏りを規制して脱落を阻
止する。また、操作レバーの回動により押えローラの離
間と糸掛けミス防止機構の開動作を同時に行うので、糸
掛け動作を速やかに且つ確実に行うことができる。As described above, in the structure of the automatic thread tensioner in the sewing machine according to the present invention, since the upper thread is always held by the thread insertion portion of the thread detachment preventing unit which is integrally formed with the pressing roller supporting arm, the thread is not dropped. Less is. Further, when the upper yarn is sandwiched between the rollers and is fed out, the yarn detachment preventing means acts so as to bring the yarn closer to the pressing roller side, so that the deviation of the yarn is regulated to prevent the yarn from falling off. Further, since the pressing roller is separated and the yarn hooking error preventing mechanism is opened simultaneously by the rotation of the operation lever, the yarn hooking operation can be performed quickly and reliably.
さらに、糸掛け後、糸供給源から両ローラの糸道経路
にある糸は、操作レバーの回動により、繰り出しローラ
に対して押えローラと糸外れ防止手段が接近し、自動的
にアンダーカット形状を有する糸外れ防止機構に確実に
案内される。Further, after the thread is hooked, the thread in the thread path from the thread supply source to the rollers is brought into contact with the feeding roller by the pressing roller and the thread detachment preventing means by the rotation of the operation lever, and the undercut shape is automatically formed. It is surely guided by the thread detachment prevention mechanism having.
第１図は本考案に係るミシンにおける自動糸調子器の構
造の一実施例を示す自動糸調子器の平面図、第２図は同
正面図、第３図は糸外れ防止手段の拡大斜視図、第４図
は同装置の構成位置を示すミシンの要部斜視図、第５図
（ａ）及び（ｂ）は従来の自動糸調子器を示す要部平面
図と正面図である。そして、第６図は本考案のミシン頭
部からの斜視図である。 １……糸調子器、５……主軸 ６……操作レバー、７……基台 ８……ソレノイド、13……繰り出しローラ 15……糸調子板、17……押えローラ 18……押えローラ支持腕、21……摺動板 21a……基端部、23……コイルスプリング 24……糸外れ防止手段、25……鉤状先端 28……アンダーカット構造、29……糸挿入部 30……連結摺動板、34……逃げ量調節部材 36……梃子腕、38……操作軸 39……揺動カム、40……回転位置検出盤 42……ホトインタラプタ 45……糸掛けミス防止機構 47……糸道閉塞部材、50……上糸落し込み孔FIG. 1 is a plan view of an automatic thread tensioner showing an embodiment of the structure of an automatic thread tensioner in a sewing machine according to the present invention, FIG. 2 is a front view of the same, and FIG. 3 is an enlarged perspective view of thread detachment preventing means. FIG. 4 is a perspective view of the essential part of the sewing machine showing the constituent positions of the apparatus, and FIGS. 5 (a) and 5 (b) are a plan view and a front view of the essential part of a conventional automatic thread tensioner. FIG. 6 is a perspective view of the sewing machine head of the present invention. 1 ... Thread tension device, 5 ... Spindle 6 ... Operation lever, 7 ... Base 8 ... Solenoid, 13 ... Feed roller 15 ... Thread tension plate, 17 ... Press roller 18 ... Press roller support Arm, 21 ...... Sliding plate 21a ...... Base end, 23 ...... Coil spring 24 ...... Thread detachment prevention means, 25 ...... Hook-like tip 28 ...... Undercut structure, 29 ...... Thread insertion part 30 ...... Connection sliding plate, 34 …… Escape amount adjusting member 36 …… Lever arm, 38 …… Operating shaft 39 …… Rotating cam, 40 …… Rotation position detection panel 42 …… Photointerrupter 45 …… Threading mistake prevention mechanism 47 …… Thread path closing member, 50 …… Upper thread drop hole
Claims (1)
支持された繰り出しローラ（13）と、 この繰り出しローラに接離可能な押えローラ（17）と、 前記繰り出しローラの回動を制御する駆動制御手段（4
0）と、を備え、 前記両ローラ間に糸供給源からの糸を挟持して、糸供給
量を制御するミシンの自動糸調子器において、 前記押えローラに支持されると共に、糸供給源側の糸を
前記ローラの軸方向の所定範囲に案内するアンダーカッ
ト形状の糸外れ防止手段（24）と、 前記両ローラから針への糸道経路を開閉可能な糸掛けミ
ス防止機構（45）と、 前記押えローラと前記糸掛けミス防止機構を連動させる
操作レバー（６）と、を備え、 前記操作レバーの回動により、押えローラの接離と糸掛
けミス防止機構の開閉とを同時に行うことを特徴とする
ミシンの自動糸調子機構。1. A feeding roller (13) which is rotatably supported while being interlocked with a main shaft of a sewing machine, a pressing roller (17) which can come into contact with and separate from the feeding roller, and controls the rotation of the feeding roller. Drive control means (4
0), and an automatic thread tensioner of a sewing machine that sandwiches a thread from a thread supply source between the rollers to control the thread supply amount, and is supported by the pressing roller and at the thread supply source side. An undercut yarn disengagement preventing means (24) for guiding the yarn of the above-mentioned yarn to a predetermined range in the axial direction of the roller, and a yarn hooking mistake preventing mechanism (45) capable of opening and closing the yarn path from the both rollers to the needle. An operating lever (6) for interlocking the presser roller and the threading error preventing mechanism, wherein the pressing roller is brought into and out of contact with the threading error preventing mechanism at the same time by rotating the operation lever. The automatic thread tension mechanism of the sewing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990078431U JPH0866Y2 (en) | 1990-07-24 | 1990-07-24 | Structure of automatic thread tensioner in sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990078431U JPH0866Y2 (en) | 1990-07-24 | 1990-07-24 | Structure of automatic thread tensioner in sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0436980U JPH0436980U (en) | 1992-03-27 |
| JPH0866Y2 true JPH0866Y2 (en) | 1996-01-10 |
Family
ID=31621698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990078431U Expired - Fee Related JPH0866Y2 (en) | 1990-07-24 | 1990-07-24 | Structure of automatic thread tensioner in sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0866Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2683207B2 (en) * | 1993-12-15 | 1997-11-26 | 奈良ミシン工業株式会社 | Needle thread feeder for sewing machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02174896A (en) * | 1988-12-27 | 1990-07-06 | Juki Corp | Thread guide for needle threads feeder |
-
1990
- 1990-07-24 JP JP1990078431U patent/JPH0866Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0436980U (en) | 1992-03-27 |
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