JPH0557079A - Remaining thread controller for use in sewing machine - Google Patents

Remaining thread controller for use in sewing machine

Info

Publication number
JPH0557079A
JPH0557079A JP22039191A JP22039191A JPH0557079A JP H0557079 A JPH0557079 A JP H0557079A JP 22039191 A JP22039191 A JP 22039191A JP 22039191 A JP22039191 A JP 22039191A JP H0557079 A JPH0557079 A JP H0557079A
Authority
JP
Japan
Prior art keywords
thread
holding plate
thread holding
moving
plate
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.)
Granted
Application number
JP22039191A
Other languages
Japanese (ja)
Other versions
JPH08157B2 (en
Inventor
Takeshi Shibuya
剛 渋谷
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.)
Juki Corp
Original Assignee
Juki Corp
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 Juki Corp filed Critical Juki Corp
Priority to JP22039191A priority Critical patent/JPH08157B2/en
Publication of JPH0557079A publication Critical patent/JPH0557079A/en
Publication of JPH08157B2 publication Critical patent/JPH08157B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B65/00Devices for severing the needle or lower thread
    • D05B65/06Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

PURPOSE:To shorten remaining thread by causing fixed and moving thread holding plates and a driving plate to rotate concentrically with one another, and exerting the moving thread holding plate with a predetermined resisting force in the direction of rotation of the plate, and forming either of the meshing toothed portions of the driving plate and the moving thread holding plate into saw teeth. CONSTITUTION:In the initial state the toothed portion 13a of a drive disk 13 meshes with the toothed portion 14a of a moving thread holding plate 14 and at an interval (t) of the moving 14 and fixed 18 thread holding plates needle thread is released from between both of the thread holding plates 14, 18 and this state is maintained throughout sewing and thread- cutting action. When the thread is cut by a thread cutting mechanism and has its cut portion pulled onto the upper side of cloth, the disk 13 is rotated in X direction by a rotary solenoid 11 and the moving thread holding plate 14 is pressed by the inclined face of the toothed portion 13a toward the moving thread holding plate 14 and along an axis L and the needle thread is held between both of the thread holding plates 14, 18. Torque applied to both of the thread holding plates 14, 18 exceeds the elastic force of a wind spring 17 and both of the thread holding plates 14, 18 are rotated through predetermined degrees in the X direction. Thereby the be needle thread is pulled back and the length of remaining thread is reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、ミシンの縫製動作開
始に際し、縫い針から導出される残り糸量を制御するミ
シンにおける残り糸量調制御装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a residual thread amount adjustment control device for a sewing machine, which controls the residual thread amount derived from a sewing needle when starting the sewing operation of the sewing machine.

【0002】[0002]

【従来の技術及びその課題】現在、ミシンには、作業者
による糸切り指令あるいは縫製動作の終了等に応じて自
動的に糸の切断を行う糸切り装置を備えたものが知られ
ているが、このようなミシンにおいては、上糸の切断端
部から縫い針に至る長さ(残り糸量)が、必要以上に長
くなる傾向にあり、これによって縫製品質が著しく悪化
するという問題が発生した。
2. Description of the Related Art At present, there are known sewing machines equipped with a thread trimming device which automatically cuts a thread in response to a thread trimming command from a worker or the end of a sewing operation. In such a sewing machine, the length from the cut end of the upper thread to the sewing needle (remaining thread amount) tends to be longer than necessary, which causes a problem that the quality of the sewn product is significantly deteriorated. ..

【0003】すなわち、通常、ミシンに具備される糸切
り装置は、縫い針やその他周辺部分との干渉を避ける上
で、縫い針昇降経路からかなり側方へ退避させた位置に
切断位置を設定している。このため、残り糸量が必要以
上に長くなり、次の縫い始めにおいて、この長尺な残り
糸が縫目に鳥の巣状に絡み合い、縫製品の外観を著しく
低下させるという問題があった。
That is, a thread trimming device usually provided in a sewing machine sets a cutting position at a position retracted considerably sideways from a sewing needle elevating path in order to avoid interference with a sewing needle and other peripheral portions. ing. For this reason, the amount of remaining thread becomes unnecessarily long, and at the beginning of the next sewing, there is a problem that the long remaining thread is entangled in the seam in a bird's nest shape, and the appearance of the sewn product is significantly deteriorated.

【0004】そこで、残り糸の短尺化を図るべく、従来
より糸切り装置についての種々の改良、提案がなされて
いるが、適用するミシンの種類が限定されるといった汎
用性の面での問題などがあり、未だ確立された技術は存
在していない。このため、縫製現場などにおいては、形
成された鳥の巣状の糸の絡みを作業者が手作業によって
除去しているのが実情であり、この作業が生産性の低下
を招く大きな要因となっていた。
Therefore, various improvements and proposals have been made to the thread trimming device in order to shorten the length of the remaining thread, but there is a problem in terms of versatility that the type of sewing machine to be applied is limited. Yes, there is no established technology yet. For this reason, at the sewing site, it is the actual situation that the operator manually removes the entanglement of the formed bird's nest-shaped thread, which is a major factor that causes a decrease in productivity. Was there.

【0005】この発明は、上記課題に着目してなされた
もので、糸切り装置などによって長尺な残り糸が形成さ
れたとしても、その残り糸を適正な長さまで短縮するこ
とができ、しかも種々のミシンに適用可能なミシンにお
ける残り糸制御装置の提供を目的とする。
The present invention has been made in view of the above problems, and even if a long residual thread is formed by a thread cutting device or the like, the residual thread can be shortened to an appropriate length, and An object of the present invention is to provide a residual thread control device for a sewing machine that can be applied to various sewing machines.

【0006】[0006]

【課題を解決するための手段】この発明は、固定側糸挟
持板、移動側糸挟持板及び駆動板を同心で回動し得るよ
うに保持すると共に、前記移動側糸挟持板に所定の抵抗
力を回動方向に対して付与すると共に、前記固定側糸挟
持板と移動側糸挟持板とに互いに噛合する歯部を形成
し、前記両歯部のうち少なくとも一方の歯部の噛合面
を、前記回動中心軸線と交叉する方向に傾斜する傾斜面
と、回動中心軸線と平行する平行面とによって鋸歯状に
形成してなり、前記両挟持板の間に上糸供給源から縫い
針に至る上糸供給経路中の上糸を導入、挟持させるよう
にしたものである。
SUMMARY OF THE INVENTION According to the present invention, a fixed side thread holding plate, a moving side thread holding plate and a drive plate are held so as to be concentrically rotatable, and a predetermined resistance is applied to the moving side thread holding plate. A force is applied to the rotation direction, and a tooth portion that meshes with the fixed-side thread holding plate and the moving-side thread holding plate is formed, and a meshing surface of at least one of the tooth portions is formed. A sawtooth shape is formed by an inclined surface that is inclined in a direction intersecting with the rotation center axis line and a parallel surface that is parallel to the rotation center axis line, and the needle thread supply source reaches the sewing needle between the both clamping plates. The upper thread in the upper thread supply path is introduced and pinched.

【0007】[0007]

【作用】この発明においては、第1,第2の歯部のうち
少なくとも一方が鋸刃状に形成されているため、駆動板
を所定の駆動手段によって一方へ回転させると、鋸刃状
の歯部の傾斜面に従って第2の歯部と共に移動側糸挟持
板がその回動中心軸線に沿って固定側糸挟持板へと移動
し、両糸挟持板の間に導入された上糸を確固に挟持す
る。すると、それまで回転方向に作用する摩擦力によっ
て回転を阻止されていた移動側糸挟持板にはその摩擦力
より大なる回転力が加わって回転を開始し、その回転力
は糸を介して固定側糸挟持板にも伝達され、両挟持板は
一体となって所定角度回転する。その結果、両挟持板よ
り縫い針側に位置する上糸は、両挟持板の回転角度に比
例した所定の長さだけ上糸供給源側から引き戻され、縫
い針から導出している長尺な残り糸は適度な長さに縮小
する。このため、次の縫製動作において残り糸が必要以
上の長さに設定されることもなくなり、良好な縫目を形
成することができる。
In the present invention, at least one of the first and second tooth portions is formed in a saw blade shape, and therefore when the drive plate is rotated to one side by a predetermined driving means, the saw blade teeth are formed. The movable side thread clamping plate moves to the fixed side thread clamping plate along the rotation center axis along with the second tooth portion according to the inclined surface of the portion, and firmly clamps the upper thread introduced between both thread clamping plates. .. Then, a rotation force larger than the frictional force is applied to the moving-side yarn clamping plate, which has been prevented from being rotated by the frictional force acting in the direction of rotation until then, and the rotation is fixed through the yarn. It is also transmitted to the side thread holding plate, and the both holding plates rotate integrally by a predetermined angle. As a result, the needle thread located on the sewing needle side of both the sandwiching plates is pulled back from the needle thread supply source side by a predetermined length proportional to the rotation angle of the both sandwiching plates, and is pulled out from the sewing needle. The remaining thread is reduced to an appropriate length. Therefore, in the next sewing operation, the remaining thread is not set to an unnecessarily long length, and good stitches can be formed.

【0008】[0008]

【実施例】以下、この発明の一実施例を図面に基づき説
明する。図1は実施例におけるミシンの上糸の供給経路
を示す図である。図中、1は本縫いミシンのミシンアー
ム、2は天秤、3はミシンアーム1に収納されたミシン
主軸の回転に同期して昇降する針棒であり、その下端部
には縫い針Nが固定されている。4,5は糸調子器であ
り、いずれも相対向する2枚の糸調子皿4a,4b及び
5a,5bを有し、それらによって上糸Iを所定の挟持
力で移動可能に挟持し、縫製時において移動する上糸に
適度な張力を発生させるようになっている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the upper thread supply route of the sewing machine in the embodiment. In the figure, 1 is a sewing machine arm of a lockstitch sewing machine, 2 is a balance, and 3 is a needle bar which moves up and down in synchronism with rotation of a sewing machine main shaft stored in the sewing machine arm 1, and a sewing needle N is fixed to a lower end portion thereof. Has been done. Numerals 4 and 5 are thread tension devices, each of which has two thread tension discs 4a, 4b and 5a, 5b facing each other, by which the upper thread I is movably clamped by a predetermined clamping force and sewn. It is designed to generate an appropriate tension on the needle thread that moves with time.

【0009】また、6は前記糸調子器4に一端を固定さ
れた糸取りばね、g1,g2,g3は糸ガイドである。
このようなミシンにおいて、図外の上糸供給源から繰り
出された上糸Iは、糸調子器5(以下この糸調子器を第
1糸調子器と称す),糸ガイドg1,糸調子器4(以下
この糸調子器を第2の糸調子器と称す)に至り、ここか
らさらに、糸取りばね6、糸ガイドg2,g1,天秤2
及び糸ガイドg3を経て縫い針Nに至るという上糸供給
経路を移動するようになっている。
Reference numeral 6 is a thread take-up spring whose one end is fixed to the thread tension regulator 4, and g1, g2 and g3 are thread guides.
In such a sewing machine, the needle thread I fed from an unillustrated needle thread supply source includes a thread tension adjuster 5 (hereinafter, this thread tension adjuster is referred to as a first thread tension adjuster), a thread guide g1, and a thread tension adjuster 4. (Hereinafter, this thread tension device is referred to as a second thread tension device), and from there, further thread take-up spring 6, thread guides g2, g1, and balance 2
Further, the needle thread supply path is moved to reach the sewing needle N via the thread guide g3.

【0010】また、Aは後述の上糸端部保持機構Bと共
にこの実施例のミシンにおける残り糸制御装置を構成す
る上糸引き戻し機構である。この上糸引き戻し機構A
は、ミシンアーム1の上面に固定されており、上糸供給
源から前記第1糸調子器5に至る上糸供給経路中に位置
している。図2及び図3はこの実施例における上糸引き
戻し機構を示す図であり、図中、10はミシンアーム1
に固定される取付け台、11はこの取付け台10にねじ
12によって固定されたロータリーソレノイド(駆動手
段)であり、駆動時には回動中心軸線Lを中心に回動軸
11aが一方(図1中、X方向)へ所定角度回転するよ
うになっている。13は中心部を前記取付け台10に回
動自在に支持されると共に前記ロータリーソレノイド1
1の回動軸11aに連結固定された駆動ディスク(駆動
板)であり、その前面には、前方へ突出する軸部13b
が前記回動中心軸線Lと同心に突設される一方、多数の
歯部13a(第2の歯部)が前記回動中心軸線Lを中心
として環状に形成されている。
Further, A is a needle thread pull-back mechanism which constitutes a residual thread control device in the sewing machine of this embodiment together with a needle thread end holding mechanism B which will be described later. This needle thread pullback mechanism A
Is fixed to the upper surface of the sewing machine arm 1 and is located in the needle thread supply path from the needle thread supply source to the first thread tensioner 5. 2 and 3 are views showing a needle thread retracting mechanism in this embodiment, in which 10 is a sewing machine arm 1.
1 is a rotary solenoid (driving means) fixed to the mount 10 by screws 12, and the rotary shaft 11a is rotated around the rotary center axis L during driving (in FIG. 1, It rotates in a predetermined angle in the X direction). A central portion 13 is rotatably supported by the mount 10 and the rotary solenoid 1 is provided.
1 is a drive disk (drive plate) connected and fixed to one rotating shaft 11a, and a front surface thereof has a shaft portion 13b protruding forward.
Is protruded concentrically with the rotation center axis L, while a large number of teeth 13a (second teeth) are formed in an annular shape around the rotation center axis L.

【0011】14は前記駆動ディスク13の軸部13b
の外周に嵌合する移動側糸挟持板であり、前記軸部13
bに対し回動及び軸線方向への移動が可能となってい
る。また、この移動側糸挟持板14の背面には、前記駆
動ディスク13の歯部13aと噛合する多数の歯部14
a(第1の歯部)が環状に形成されている。そして、こ
の第1の歯部14a及び前記第2の歯部13aの各噛合
面はいずれも鋸刃状に形成されている。すなわち、図4
に示すように、両歯部13a,14aは、いずれも前記
回動中心軸線Lと交叉する方向に傾斜する傾斜面13a
1,14a1と、回動中心軸線Lと平行する平行面13
a2,14a2とによって形成され、これらによって鋸
歯状をなしている。
Reference numeral 14 denotes a shaft portion 13b of the drive disk 13.
Which is a moving side thread holding plate fitted to the outer periphery of the shaft portion 13
It is possible to rotate and move in the axial direction with respect to b. Further, on the back surface of the moving side thread holding plate 14, a large number of tooth portions 14 that mesh with the tooth portions 13a of the drive disk 13 are provided.
a (first tooth portion) is formed in an annular shape. Further, each meshing surface of the first tooth portion 14a and the second tooth portion 13a is formed in a saw-tooth shape. That is, FIG.
As shown in FIG. 2, both tooth portions 13a and 14a are inclined surfaces 13a that are inclined in a direction intersecting with the rotation center axis L.
1, 14a1 and a parallel surface 13 parallel to the rotation center axis L
a2 and 14a2, which form a sawtooth shape.

【0012】一方、15は両側部をねじ16によって前
記取付け台10に固定した保持板であり、その背面部に
は、巻きばね17を介して固定側糸挟持板18が弾性的
に取り付けられている。すなわち、巻きばね17の一端
部には固定側糸挟持板18が、他端部には保持板15が
固定されており、これによって常には固定側糸挟持板1
8が所定の回動位置に保持されるようになっている。
On the other hand, reference numeral 15 is a holding plate whose both sides are fixed to the mounting base 10 by screws 16, and a fixed side thread holding plate 18 is elastically attached to the back side thereof via a winding spring 17. There is. That is, the fixed-side thread holding plate 18 is fixed to one end of the winding spring 17, and the holding plate 15 is fixed to the other end thereof.
8 is held in a predetermined rotation position.

【0013】また、固定側糸挟持板18の中心部は前記
駆動ディスク13の軸部13bの先端部に当接している
ため、回動中心軸線L方向への移動は阻止されており、
常には、前記移動側糸挟持板14の周縁部との間に所定
の対向間隙tが形成されている。
Further, since the central portion of the fixed side thread holding plate 18 is in contact with the tip portion of the shaft portion 13b of the drive disk 13, the movement in the direction of the rotation center axis L is prevented.
A predetermined opposing gap t is always formed between the moving side thread holding plate 14 and the peripheral edge portion thereof.

【0014】19は前記移動側糸挟持板14を駆動ディ
スク13へ向けて付勢する圧縮ばねであり、前記固定側
糸挟持板18と移動側糸挟持板14との間に介在してお
り、これによって歯部14aと歯部13aとが常時噛合
するようになっている。また、20は前記移動側糸挟持
板14と固定側糸挟持板18とを連結する連結ピンであ
り、その両端部は前記移動側糸挟持板14に形成した溝
14bとこれに対向して前記固定側糸挟持板18に形成
した貫通孔18aとにそれぞれ移動可能に挿通されてい
る。
Reference numeral 19 is a compression spring for urging the moving-side yarn holding plate 14 toward the drive disk 13, and is interposed between the fixed-side yarn holding plate 18 and the moving-side yarn holding plate 14. As a result, the tooth portion 14a and the tooth portion 13a always mesh with each other. Reference numeral 20 is a connecting pin for connecting the moving side thread holding plate 14 and the fixed side thread holding plate 18, both ends of which are opposed to the groove 14b formed in the moving side thread holding plate 14 and the groove 14b. Each of them is movably inserted into a through hole 18a formed in the fixed-side thread holding plate 18.

【0015】なお、図3において、15a,15bは前
記保持板15の両側面にそれぞれ形成した糸掛け孔、1
0aは前記取付け台10に固定したストッパであり、こ
のストッパにより前記駆動ディスク13の回転角を規制
するようになっている。
In FIG. 3, 15a and 15b are thread hooking holes formed on both side surfaces of the holding plate 15, respectively.
Reference numeral 0a is a stopper fixed to the mounting table 10, and the stopper controls the rotation angle of the drive disk 13.

【0016】また、図5ないし図7は上糸端部保持機構
Bの構成を示す図である。図において、21はミシンベ
ッドに固定される針板であり、この針板21には縫い針
Nを挿通させる針孔21aと図外の送り歯を出没させる
送り歯挿通孔21bとが形成されており、さらに、その
下面には前記針孔21aの開口部周縁に凹部21cが形
成されると共に、布送り方向に沿って蟻溝21dが形成
され、この蟻溝21dには糸挟持アーム22が移動可能
に嵌合している。また、23はこの糸挟持アーム22の
先端部に固定した上糸保持部材であり、前記糸挟持アー
ム22の進退に伴って前記凹部21cに形成した端面2
1c1に対して接離するようになっている。
5 to 7 are views showing the structure of the needle thread end holding mechanism B. As shown in FIG. In the figure, reference numeral 21 denotes a needle plate fixed to the sewing machine bed. The needle plate 21 has a needle hole 21a through which a sewing needle N is inserted and a feed dog through hole 21b through which a feed dog (not shown) is retracted. Further, a concave portion 21c is formed on the lower surface of the needle hole 21a at the periphery of the opening of the needle hole 21a, and a dovetail groove 21d is formed along the cloth feeding direction. The thread holding arm 22 moves in the dovetail groove 21d. Fitting is possible. Numeral 23 is an upper thread holding member fixed to the tip of the thread holding arm 22, and the end face 2 formed in the recess 21c as the thread holding arm 22 advances and retracts.
It is designed to come into contact with and separate from 1c1.

【0017】24はミシンベッドの内方に設けた駆動手
段としてのロータリーソレノイドであり、その回動軸2
4aには、弾性を有するL字状の駆動レバー25の一端
部が固定されている。またこの駆動レバー25の他端部
は前記糸挟持アーム22の一端部に固定されており、前
記回動軸24aを回転させることにより、これと共に駆
動レバー25が回転し、糸挟持アーム22を蟻溝21d
に沿って進退させるようになっている。
Reference numeral 24 is a rotary solenoid as a driving means provided inside the sewing machine bed, and its rotary shaft 2
One end of an elastic L-shaped drive lever 25 is fixed to 4a. The other end of the drive lever 25 is fixed to one end of the thread gripping arm 22. By rotating the rotating shaft 24a, the drive lever 25 rotates together with the rotation shaft 24a, and the thread gripping arm 22 moves. Groove 21d
It is designed to move back and forth along.

【0018】以上の構成に基づき、次に作用を説明す
る。上記上糸引き戻し機構Aにおいて、上糸供給源から
繰り出された上糸Iは、保持板15の一方の糸掛け孔1
5aから他方の糸掛け孔15bに亘って掛け渡され、さ
らに両糸掛け孔15a,15bの間では移動側糸挟持板
14と固定側糸挟持板18との間に形成される対向間隙
tに導入される。
Next, the operation will be described based on the above configuration. In the upper thread pulling-back mechanism A, the upper thread I fed from the upper thread supply source is the one thread hooking hole 1 of the holding plate 15.
5a to the other yarn hooking hole 15b, and between the two yarn hooking holes 15a and 15b, there is a facing gap t formed between the moving side yarn holding plate 14 and the fixed side yarn holding plate 18. be introduced.

【0019】そして、上糸引き戻し機構Aが初期状態に
ある時、すなわち、ロータリーソレノイド11が非駆動
状態にある時、駆動ディスク13の歯部13aと移動側
糸挟持板14の歯部14aとは、図4(a)に示すよう
に互いに密接した完全な噛合状態にある。このため、移
動側糸挟持板14と固定側糸挟持板18との対向間隙t
は最大となり、上糸Iは両糸挟持板14,18によって
解放された状態となる。この上糸解放状態は、縫製動作
及び糸切り動作において維持されており、その間、上糸
引き戻し機構Aは全く上糸Iに影響しない。なお、第
1,第2の糸調子器4,5は縫製動作開始から糸切り動
作終了までの間、上糸Iを挟持した状態となっている。
When the needle thread retracting mechanism A is in the initial state, that is, when the rotary solenoid 11 is in the non-driving state, the tooth portion 13a of the drive disk 13 and the tooth portion 14a of the moving side thread holding plate 14 are separated from each other. As shown in FIG. 4 (a), they are in a completely meshed state in which they are in close contact with each other. Therefore, the facing gap t between the moving-side thread holding plate 14 and the fixed-side thread holding plate 18 is t.
Becomes the maximum, and the upper thread I is in a state of being released by the two thread holding plates 14 and 18. This upper thread released state is maintained during the sewing operation and the thread cutting operation, during which the upper thread retracting mechanism A does not affect the upper thread I at all. The first and second thread tension regulators 4 and 5 are in a state of sandwiching the upper thread I from the start of the sewing operation to the end of the thread cutting operation.

【0020】ここで、糸切り機構によって糸が切断され
ると、切断された上糸Iの端部は、図外のワイパー機構
によって図1に示すように布Wの下面から上方へ引き抜
かれ、これと同時に第1,第2の糸調子器4,5は上糸
解放状態となる。このとき、縫い針Nの糸通し孔Naか
ら切断端部に至る上糸の長さ(残り糸量)I1は、先の
従来技術にて述べたように糸切り機構によってかなり長
尺なものとなっているが、ワイパー機構にて上糸Iの切
断端部が布の上面へ引き抜かれると同時に上糸引き戻し
機構Aが作動し、上糸Iは上糸供給源側に引き戻され
る。
When the thread is cut by the thread cutting mechanism, the end of the cut upper thread I is pulled upward by the wiper mechanism (not shown) from the lower surface of the cloth W, as shown in FIG. At the same time, the first and second thread tension regulators 4 and 5 are in the upper thread released state. At this time, the length (remaining thread amount) I1 of the upper thread from the threading hole Na of the sewing needle N to the cut end portion is considerably long by the thread cutting mechanism as described in the prior art. However, at the same time when the cut end of the upper thread I is pulled out to the upper surface of the cloth by the wiper mechanism, the upper thread retracting mechanism A operates and the upper thread I is retracted to the upper thread supply source side.

【0021】すなわち、上糸Iの切断端部が布の上面へ
引き抜かれると、ロータリーソレノイド11の作動によ
って回動軸11aと共に駆動ディスク13が同方向(図
1及び図3のX方向)へ回転する。これにより、移動側
糸挟持板14は駆動ディスク13の歯部13aに形成さ
れた傾斜面13a1により、回動中心軸線Lに沿って固
定側糸挟持板18側へ押し出されて行き、最終的に移動
側糸挟持板14と固定側糸挟持板18との間で上糸Iを
確固に挟持する。
That is, when the cut end of the upper thread I is pulled out to the upper surface of the cloth, the drive disk 13 is rotated in the same direction (X direction in FIGS. 1 and 3) together with the rotary shaft 11a by the operation of the rotary solenoid 11. To do. As a result, the moving side thread holding plate 14 is pushed out toward the fixed side thread holding plate 18 side along the rotation center axis L by the inclined surface 13a1 formed on the tooth portion 13a of the drive disk 13, and finally. The needle thread I is firmly clamped between the moving side thread holding plate 14 and the fixed side thread holding plate 18.

【0022】なお、上糸Iが確固に挟持されるまでの
間、移動側糸挟持板14には、駆動ディスク13の回転
によって回転方向Xへの力も加わるが、移動側糸挟持板
14と固定側糸挟持板18とは、連結ピン20によって
回転方向に対し一体的に連結されているため、移動側糸
挟持板14は固定側糸挟持板18と共にその回転を巻き
ばね17の弾性力(保持力)によって阻止される。
While the needle thread I is firmly clamped, a force in the rotation direction X is applied to the moving side thread holding plate 14 by the rotation of the drive disk 13, but the moving side thread holding plate 14 is fixed to the moving side thread holding plate 14. Since the side thread holding plate 18 is integrally connected to the rotation direction by the connecting pin 20, the moving side thread holding plate 14 rotates together with the fixed side thread holding plate 18 to rotate the elastic force (holding force) of the winding spring 17. Force).

【0023】ここで、移動側糸挟持板14が固定側糸挟
持板18との間で確固に上糸Iを挟持すると、両糸挟持
板14,18に加わる回転力は前記巻きばね17の弾性
力を上回り、両糸挟持板14,18はX方向へ回転し、
予め設定した所定の角度分回転した時点で停止する。こ
れにより、上糸Iは上糸供給源側に引き戻され、縫い針
Nの糸通し孔Naから導出している残り糸I1の長さは
短縮化される。なお、この回転角度は、ストッパ10a
の固定位置を調節することによりにより適宜調節するこ
とがとできる。
Here, when the moving side thread holding plate 14 firmly holds the upper thread I with the fixed side thread holding plate 18, the rotational force applied to both the thread holding plates 14 and 18 is the elasticity of the winding spring 17. The force is exceeded, the yarn holding plates 14 and 18 rotate in the X direction,
It stops when it rotates by a predetermined angle set in advance. As a result, the upper thread I is pulled back to the upper thread supply source side, and the length of the remaining thread I1 led out from the thread passing hole Na of the sewing needle N is shortened. Note that this rotation angle depends on the stopper 10a.
It is possible to make an appropriate adjustment by adjusting the fixed position of.

【0024】両糸挟持板14,18が所定角度回転した
後は、ロータリーソレノイド11が非駆動状態となり、
移動側糸挟持板14が圧縮ばね19の付勢力によって駆
動ディスク13側へ移動し、両歯部13a,14aが互
いに完全に噛合する。これにより、両糸挟持板14と1
8との対向間隔tは拡大し、上糸Iは解放状態となり、
駆動ディスク13は巻きばね17の回転力によって初期
状態における元の位置へ復帰する。また、ロータリーソ
レノイド11が非作動状態に切り替わる直前で第1,第
2の糸調子器4,5は上糸挟持状態に復帰する。
After the two thread holding plates 14 and 18 have rotated by a predetermined angle, the rotary solenoid 11 is brought into a non-driving state,
The moving side thread holding plate 14 is moved to the drive disk 13 side by the urging force of the compression spring 19 so that both tooth portions 13a and 14a are completely meshed with each other. As a result, both thread holding plates 14 and 1
The distance t facing 8 is increased, and the upper thread I is released,
The drive disk 13 returns to the original position in the initial state by the rotational force of the winding spring 17. Further, immediately before the rotary solenoid 11 is switched to the non-operating state, the first and second thread tension regulators 4 and 5 are returned to the upper thread holding state.

【0025】このように、この実施例では、上記上糸引
き戻し動作をワイパー動作直後に行うようにしたため、
糸取りばね6の影響を受けることなく、上糸引き戻し機
構Aによる引き戻し量、すなわち、両糸挟持板14,1
8の回転角度分だけを正確に引き戻すことができる。
As described above, in this embodiment, since the above-mentioned upper thread pullback operation is performed immediately after the wiper operation,
Without being affected by the thread take-up spring 6, the amount of pullback by the upper thread pullback mechanism A, that is, both thread holding plates 14, 1
Only the rotation angle of 8 can be accurately pulled back.

【0026】また、ここでは、上糸引き戻し機構Aによ
る上糸引き戻し量は、次の縫製開始時において必要最小
限の長さとなるように設定している。つまり、次の縫製
動作開始時において縫い針Nが下死点に達した状態で、
その糸通し穴Naから布の上面に至る距離Hと同一かあ
るいは僅かに大なる長さに設定しており、これによって
上糸Iの切断端部が図7に示す用に布Wの上面と同一
か、あるいはごく僅かに上方へ突出する程度の長さに設
定している。従って、そのまま縫製動作を実行すれば、
縫い針Nの糸通し孔Naから上糸Iが抜脱し、縫目形成
不良を発生させる可能性もある。
Further, here, the upper thread withdrawal amount by the upper thread withdrawal mechanism A is set to be the minimum required length at the start of the next sewing. That is, when the sewing needle N reaches the bottom dead center at the start of the next sewing operation,
The length H is set to be equal to or slightly larger than the distance H from the threading hole Na to the upper surface of the cloth, whereby the cut end of the upper thread I and the upper surface of the cloth W as shown in FIG. The length is set to be the same or slightly so as to project upward. Therefore, if you continue the sewing operation,
There is a possibility that the upper thread I may be pulled out from the threading hole Na of the sewing needle N and a defective stitch formation may occur.

【0027】しかしながら、この実施例では、縫製開始
時の第1針において、前記上糸Iの切断端部近傍を上糸
端部保持機構Bによって確固に挟持することで、縫い針
Nから上糸Iが抜脱するのを防止し得るようになってい
る。すなわち、縫製開始時の第1針において縫い針Nが
下死点に達した時点あるいは、下死点から若干上昇して
残り糸I1にループが形成され始めた時点で、ロータリ
ーソレノイド24が駆動され、回動軸24aが図5の矢
符Yに示す方向へ回転し、それと共に駆動レバー25が
図5中一点鎖線にて示すように移動する。この駆動レバ
ー25の移動によって糸挟持アーム22が針板21のあ
り溝21dに沿って移動し、これに固定された上糸保持
部材23が図6の(a)に示す初期位置から凹部21c
の端面21c1に向けて移動し、図6の(b)に示すよ
うに残り糸I1の切断端部近傍を前記端面21c1との
間で確固に挟持する。この挟持状態は、その後第2針に
おいて縫い針Nが布Wを貫通するまでの間維持される。
However, in this embodiment, the needle thread end holding mechanism B firmly clamps the vicinity of the cut end portion of the needle thread I at the first needle at the start of sewing, whereby the needle thread N from the needle needle N is firmly held. I can be prevented from coming off. That is, the rotary solenoid 24 is driven when the sewing needle N reaches the bottom dead center at the first needle at the start of sewing or when the sewing needle N slightly rises from the bottom dead center and a loop is formed in the remaining thread I1. The rotation shaft 24a rotates in the direction indicated by the arrow Y in FIG. 5, and the drive lever 25 moves with it in the direction shown by the alternate long and short dash line in FIG. By the movement of the drive lever 25, the thread holding arm 22 moves along the dovetail groove 21d of the needle plate 21, and the needle thread holding member 23 fixed thereto moves from the initial position shown in FIG.
To the end face 21c1 and firmly clamp the vicinity of the cut end of the remaining yarn I1 with the end face 21c1 as shown in FIG. 6 (b). This sandwiched state is maintained until the sewing needle N penetrates the cloth W at the second needle thereafter.

【0028】これにより、上糸端部は、第1針目におけ
る天秤2の上糸引き上げ動作などによって縫い針Nの糸
通し孔Naから抜脱することはなくなり、確実に縫目を
形成することができる。
As a result, the upper thread end portion will not be pulled out from the threading hole Na of the sewing needle N due to the upper thread pulling operation of the balance 2 at the first stitch, and the stitch can be reliably formed. it can.

【0029】なお、第2針で縫い針Nが布Wを貫通すれ
ば、布Wと上糸Iとの抵抗力が増大するため、それ以降
において上糸切断端部の挟持を解除しても上糸切断端部
側から糸が引き出されることはなく、第1針と第2針と
によって形成される最初の縫目も確実に保持される。ま
た、第2針で縫い針Nが布Wを貫通した時点で直ちに上
糸Iを解放しなくとも、それ以降の所定のタイミングで
上糸Iの解放を行うようにしても良い。例えば、第3針
あるいはそれ以降の所定の針数に達するまで上糸Iを挟
持させておくようにすることも可能であり、その時間は
布Wや上糸Iの摩擦抵係数等に応じて適宜設定すれば良
い。但し、長時間に亘って上糸Iを挟持することは布の
進行を妨げる結果となるため、上糸挟持期間は必要最小
限に留めることが望ましい。
If the sewing needle N penetrates the cloth W with the second needle, the resistance force between the cloth W and the upper thread I increases, so that the nipping of the upper thread cutting end can be released thereafter. The thread is not pulled out from the upper thread cutting end side, and the first stitch formed by the first needle and the second needle is reliably held. Further, the upper thread I may be released at a predetermined timing after that even if the upper thread I is not released immediately when the sewing needle N penetrates the cloth W with the second needle. For example, it is possible to hold the upper thread I until the third needle or a predetermined number of needles after that is reached, and the time depends on the friction coefficient of the cloth W and the upper thread I. It may be set appropriately. However, holding the upper thread I for a long time results in hindering the progress of the cloth. Therefore, it is desirable to keep the upper thread holding period to a necessary minimum.

【0030】このように、この実施例においては、第1
針目に上糸端部挟持機構Bによって上糸Iの切断端部近
傍を確固に挟持するようにしたため、上糸引き戻し機構
Aによって残り糸I1の長さを距離Hに設定したとして
も、確実に縫製動作を実行させることができるようにな
っている。つまり、この実施例における残り糸制御装置
は、上糸端部挟持機構Bを設けたことにより、上糸引き
戻し機構Aによる上糸引き戻し量の設定において、天秤
2による上糸引き上げ量などを殆ど考慮せずに設定する
ことができ、その設定操作の単純化が図られている。
Thus, in this embodiment, the first
Since the upper thread end clamping mechanism B firmly clamps the vicinity of the cut end of the upper thread I at the stitch, even if the upper thread pullback mechanism A sets the length of the remaining thread I1 to the distance H The sewing operation can be executed. In other words, the remaining thread control device in this embodiment is provided with the upper thread end clamping mechanism B, so that when setting the upper thread pullback amount by the upper thread pullback mechanism A, the upper thread pullup amount by the balance 2 and the like are almost taken into consideration. It can be set without doing so, and the setting operation is simplified.

【0031】しかしながら、上糸引き戻し量を、前記距
離Hに加え、天秤2の上糸引き上げ量等を勘案して設定
する場合には、特に上糸端部挟持機構Bを設けずとも、
縫目始端に形成される残り糸量を上記実施例と同様に極
めて微小なものとすることができる。すなわち、上糸引
き戻し機構Aのみによって残り糸制御装置を構成するこ
とも可能である。
However, when the upper thread pullback amount is set in consideration of the upper thread pulling amount of the balance 2 in addition to the distance H, the upper thread end holding mechanism B is not particularly provided.
The residual thread amount formed at the seam start end can be made extremely small as in the above-described embodiment. That is, it is possible to configure the remaining thread control device by only the upper thread pullback mechanism A.

【0032】また、上記実施例では、第1,第2の歯部
13a,14aを共に鋸歯状に形成した場合を示した
が、これら歯部は必ずしも双方が鋸歯状を有していなく
とも良く、いずれか一方が鋸歯状をなしていれば、他方
の歯部は一方の歯部と噛合し得る形状であれば特に鋸刃
状に限定されない。また、各歯部13a,14aはそれ
ぞれ駆動ディスク13,移動側糸挟持板14に環状に配
置形成するものとしたが、特に環状に限らず円弧状に形
成することも可能であり、要は回動中心軸線Lを中心と
する環状位置において、移動側糸挟持板14を必要量回
転し得るような範囲に形成すれば良い。
In the above embodiment, the case where both the first and second tooth portions 13a and 14a are formed in a sawtooth shape is shown. However, these tooth portions may not necessarily have a sawtooth shape. If any one of them has a sawtooth shape, the other tooth portion is not particularly limited to the sawtooth shape as long as it can mesh with the one tooth portion. Further, the tooth portions 13a and 14a are arranged and formed in the driving disk 13 and the moving side thread holding plate 14 in an annular shape, respectively. However, the tooth portions 13a and 14a may be formed in an arc shape without being limited to an annular shape. It is sufficient to form the movable side thread holding plate 14 in a range in which it can be rotated by a necessary amount at an annular position around the dynamic center axis L.

【0033】さらにまた、上記実施例では、巻きばね1
7によって弾性的に保持された固定側糸挟持板18に連
結ピン20を介して移動側糸挟持板14を連結すること
で、言わば間接的に移動側糸挟持板14に回転方向への
抵抗力を付与するようにしたが、移動側糸挟持板14の
みに直接的に回転方向への抵抗力を付与するようにして
も良く、この発明は特に上記実施例に限定されるもので
はない。
Furthermore, in the above embodiment, the spiral spring 1
By connecting the moving-side thread holding plate 14 via the connecting pin 20 to the fixed-side thread holding plate 18 elastically held by 7, the so-called indirect moving force of the moving-side thread holding plate 14 in the direction of rotation. However, the resistance force in the rotation direction may be directly applied only to the moving side thread holding plate 14, and the present invention is not particularly limited to the above embodiment.

【0034】[0034]

【発明の効果】以上説明したとおり、この発明は、固定
側糸挟持板、移動側糸挟持板及び駆動板を同心で回動し
得るように保持すると共に、駆動板と移動側糸挟持板と
に互いに噛合する歯部を形成し、駆動板を回転させるこ
とにより、前記両歯部の噛合位置を変化させ移動側糸挟
持板を固定側糸挟持板側へ移動させて上糸を両糸挟持板
の間で挟持させた後、駆動板のさらなる回転によりこれ
と共に両糸挟持板を同方向へ回転させるようにしたた
め、縫製動作終了後、糸切り装置によって長尺な残り糸
Iが形成されたとしても、前記駆動板を回転駆動させる
ことにより、その回転角度に応じた長さの上糸を上糸供
給源側へ正確に引き戻すことができる。このため、縫い
針から導出される残り糸を次の縫製動作に必要な最小限
の長さに設定することが可能となり、従来のように縫目
始端部に鳥の巣状の糸の絡みが形成されることもなくな
り、優れた縫製品質を得ることができるという効果があ
り、さらに、この発明は、ミシンの種類を問わずいかな
るミシンにも適用可能であり、汎用性にも優れるという
効果がある。
As described above, according to the present invention, the fixed side thread holding plate, the moving side thread holding plate and the drive plate are held so as to be concentrically rotatable, and the drive plate and the moving side thread holding plate are provided. By forming a tooth part that meshes with each other and rotating the drive plate, the meshing position of both tooth parts is changed to move the moving side thread holding plate to the fixed side thread holding plate side to hold the upper thread After being clamped between the boards, both the thread clamping plates are rotated in the same direction by the further rotation of the drive plate. Therefore, even after the sewing operation is completed, a long residual thread I is formed by the thread trimming device. By rotating the drive plate, the needle thread having a length corresponding to the rotation angle can be accurately pulled back to the needle thread supply source side. For this reason, it is possible to set the remaining thread derived from the sewing needle to the minimum length required for the next sewing operation, and the bird's nest thread entanglement at the seam start end as in the past. It is also possible to obtain excellent sewn product quality without being formed, and further, the present invention can be applied to any sewing machine regardless of the type of sewing machine, and has the effect of being excellent in versatility. is there.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例における上糸引き戻し機構
のミシンアームへの装着状態を示す正面図である。
FIG. 1 is a front view showing a mounting state of a needle thread pullback mechanism on a sewing machine arm according to an embodiment of the present invention.

【図2】同実施例における上糸引き戻し機構の構成を示
す一部縦断側面図である。
FIG. 2 is a partial vertical cross-sectional side view showing the configuration of a needle thread pullback mechanism in the embodiment.

【図3】図2に示したものの正面図である。FIG. 3 is a front view of what is shown in FIG.

【図4】図2に示したものの両歯部の噛合状態を示す側
面図であり、(a)は初期状態における両歯部の噛合状
態を示し、(b)は駆動ディスクが回転した際の両歯部
の噛合状態を示す。
FIG. 4 is a side view showing a meshing state of both tooth portions of the one shown in FIG. 2, (a) showing a meshing state of both tooth portions in an initial state, and (b) showing a state when the drive disk rotates. The meshing state of both tooth parts is shown.

【図5】この発明の一実施例における上糸端部保持機構
を示す底面図である。
FIG. 5 is a bottom view showing the needle thread end portion holding mechanism in the embodiment of the present invention.

【図6】(a)は図5に示したものの部分拡大平面図、
(b)は同図(a)に示したものの動作状態を示す部分
拡大平面図である。
6 (a) is a partially enlarged plan view of what is shown in FIG. 5,
(B) is a partially enlarged plan view showing an operating state of the one shown in FIG.

【図7】図6の(a)に示したもののX−Y縦断側面図
である。
FIG. 7 is an XY vertical side view of what is shown in FIG. 6 (a).

【符号の説明】[Explanation of symbols]

11 ロータリーソレノイド(駆動手段) 13 駆動ディスク(駆動板) 13a 歯部(第2の歯部) 13a1 傾斜面 13a2 平行面 14 移動側糸挟持板 14a 歯部(第1の歯部) 14a1 傾斜面 14a2 平行面 18 固定側糸挟持板 A 上糸引き戻し機構 B 上糸端部保持機構 N 縫い針 I 上糸 I1 残り糸 L 回動中心軸線 W 布 11 Rotary Solenoid (Drive Means) 13 Drive Disk (Drive Plate) 13a Teeth (Second Tooth) 13a1 Slope 13a2 Parallel Surface 14 Moving Side Thread Clamping Plate 14a Teeth (First Teeth) 14a1 Slope 14a2 Parallel surface 18 Fixed side thread clamp plate A Upper thread pullback mechanism B Upper thread end holding mechanism N Sewing needle I Upper thread I1 Remaining thread L Rotation center axis W W cloth

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 所定の保持体によって回動自在に支持さ
れると共に、回動中心軸線方向への移動を不能とした固
定側糸挟持板と、 前記固定側糸挟持板と同心に回動可能であり、かつその
回動中心軸線に沿って固定側糸挟持板に対し進退可能な
移動側糸挟持板と、 この移動側糸挟持板の固定側糸挟持板との非対向面にお
いて前記回動中心軸線を中心とする環状位置の少なくと
も一部に形成した鋸歯状の第1の歯部と、 前記移動側糸挟持板との対向面に前記第1の歯部と噛合
する第2の歯部を有し、所定の駆動手段によって移動側
糸挟持板と同心に回動する駆動板と、を備え、 前記移動側糸挟持板に、所定の抵抗力を回動方向に対し
て付与すると共に、 前記両歯部のうち少なくとも一方の歯部の噛合面を、前
記回動中心軸線と交叉する方向に傾斜する傾斜面と、回
動中心軸線と平行する平行面とによって鋸歯状に形成
し、 かつ、前記固定側糸挟持板と移動側糸挟持板との対向間
隙に上糸供給源から縫い針に至る上糸供給経路中の上糸
を導入させてなり、 前記移動側糸挟持板を一方へ回転させ、第1の歯部に形
成された傾斜面に沿って滑動する第2の歯部と共に移動
側糸挟持板を固定側糸挟持板へ進出させ、両糸挟持板間
に導入された上糸を挟持させると共に、前記駆動板を前
記抵抗力より大なる力で回転させることにより、上糸を
挟持した両糸挟持板を駆動板と一体に回転させ、上糸を
上糸供給源側へ引き戻すようにしたことを特徴とするミ
シンにおける残り糸量制御装置。
1. A fixed side thread holding plate which is rotatably supported by a predetermined holding body and which is not movable in the direction of the rotation center axis, and is rotatable concentrically with the fixed side thread holding plate. And the movable side thread holding plate that can move back and forth with respect to the fixed side thread holding plate along the rotation center axis, and the rotation on the non-opposing surface of the moving side thread holding plate with the fixed side thread holding plate. A second tooth portion that meshes with the first tooth portion on a surface facing the saw-tooth-shaped first tooth portion formed at least at a part of an annular position around the central axis and the moving-side thread holding plate. And a drive plate that rotates concentrically with the moving-side thread holding plate by a predetermined driving means, and applies a predetermined resistance force to the moving-side thread holding plate in the turning direction, Inclining the meshing surface of at least one of the tooth portions in a direction intersecting the rotation center axis line. Is formed in a saw-tooth shape by the inclined surface and the parallel surface parallel to the central axis of rotation, and from the needle thread supply source to the sewing needle in the facing gap between the fixed side thread holding plate and the moving side thread holding plate. The upper thread in the upper thread supply path is introduced, the moving side thread holding plate is rotated to one side, and the moving side is moved together with the second tooth portion that slides along the inclined surface formed on the first tooth portion. The yarn clamp plate is advanced to the fixed side yarn clamp plate to clamp the upper yarn introduced between both yarn clamp plates, and the drive plate is rotated by a force larger than the resistance force to clamp the upper yarn. A remaining thread amount control device for a sewing machine, characterized in that the both thread holding plates are rotated integrally with the drive plate so that the upper thread is pulled back to the upper thread supply source side.
JP22039191A 1991-08-30 1991-08-30 Remaining thread amount control device in sewing machine Expired - Lifetime JPH08157B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22039191A JPH08157B2 (en) 1991-08-30 1991-08-30 Remaining thread amount control device in sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22039191A JPH08157B2 (en) 1991-08-30 1991-08-30 Remaining thread amount control device in sewing machine

Publications (2)

Publication Number Publication Date
JPH0557079A true JPH0557079A (en) 1993-03-09
JPH08157B2 JPH08157B2 (en) 1996-01-10

Family

ID=16750383

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22039191A Expired - Lifetime JPH08157B2 (en) 1991-08-30 1991-08-30 Remaining thread amount control device in sewing machine

Country Status (1)

Country Link
JP (1) JPH08157B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105970503A (en) * 2016-07-26 2016-09-28 杰克缝纫机股份有限公司 Empty overcasting stitching thread clamping mechanism and sewing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105970503A (en) * 2016-07-26 2016-09-28 杰克缝纫机股份有限公司 Empty overcasting stitching thread clamping mechanism and sewing machine

Also Published As

Publication number Publication date
JPH08157B2 (en) 1996-01-10

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