EP0451087B1 - Dispositif de contrôle de la tension du fil sur machine à coudre - Google Patents

Dispositif de contrôle de la tension du fil sur machine à coudre Download PDF

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Publication number
EP0451087B1
EP0451087B1 EP91810088A EP91810088A EP0451087B1 EP 0451087 B1 EP0451087 B1 EP 0451087B1 EP 91810088 A EP91810088 A EP 91810088A EP 91810088 A EP91810088 A EP 91810088A EP 0451087 B1 EP0451087 B1 EP 0451087B1
Authority
EP
European Patent Office
Prior art keywords
thread
spring
regulating device
lever
needle
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 - Lifetime
Application number
EP91810088A
Other languages
German (de)
English (en)
Other versions
EP0451087A1 (fr
Inventor
Hanspeter Vogel
Niklaus Wacker
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.)
Fritz Gegauf AG
Original Assignee
Fritz Gegauf AG
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 Fritz Gegauf AG filed Critical Fritz Gegauf AG
Publication of EP0451087A1 publication Critical patent/EP0451087A1/fr
Application granted granted Critical
Publication of EP0451087B1 publication Critical patent/EP0451087B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B49/00—Take-up devices, e.g. levers, for the needle thread
    • D05B49/02—Take-up devices, e.g. levers, for the needle thread operated by cams or linkages

Definitions

  • the present invention relates to a thread regulating device for sewing machines according to the preamble of patent claim 1.
  • the upper thread leading to the eye of the needle must track the movement of the needle during the stitching process, ie when the needle is lowered onto and into the sewing material, so that there are no short-term tensile stresses on the thread which impair the stitch formation process. It has therefore been known for a long time, for example from German Patent No. 63675, to arrange an oscillating articulated thread lever above the needle, which lever is moved up and down essentially synchronously with the needle, so that the thread fed to the needle eye is neither jerky nor tensed forms a loose loop that can wind around the needle.
  • the well-known joint thread encoder orders from the link, the small drive crank and the actual thread upper joint. All three parts are hinged together.
  • the operation of the thread lever is essentially dependent on the radius of the crank pin and its position relative to the arm shaft crank, the length of the handlebar and the position of its suspension in the head of the machine.
  • the rotation of the arm shaft crank forces the hinged parts of the joint thread lever to follow, and as a result of this controlled movement, the thread-guiding eye of the thread lever describes a path that should essentially correspond to the speed curve of the eye of the needle.
  • the known thread take-up levers cannot track the thread absolutely exactly at the eye of the needle at every point in time of a stitch formation process, which is why thread regulating springs are inserted into the thread run, which compensate and also take on further tasks during the stitch formation process.
  • the thread regulating spring has the following tasks: It must take up the upper thread that is loosened when the thread take-up device moves downwards until the eye of the needle penetrates the material. This prevents the needle from sticking into the loose thread the thread cannot wrap around the needle tip and twisting of the thread before entering the eye of the needle is also prevented. Thread breaks or impairments of the seam are avoided in this way.
  • the thread regulating spring comes into action again shortly before the hook loosens the widened upper thread loop. It causes the upper thread loop to be pulled off gently and smoothly before the thread take-up takes effect and pulls the thread up and into the material at an increased speed.
  • the thread regulating spring can also serve to pull off the upper thread loop slipping through between the bobbin case finger and the retaining means preventing rotation of the capsule at the exact moment when the finger and the retaining means do not lie against one another. This results in a soft and low-noise thread take-off. Due to its function, the thread regulating spring may only exert a relatively weak tensile effect on the thread. At the right moment, however, it must act on the thread quickly and with as little loss as possible. Accordingly, the location, the design and the type of attachment of the spring are of considerable importance. The spring should also be arranged so that the operator does not have to pay particular attention to inserting the thread into the regulating spring when threading the machine.
  • a thread take-up element which keeps the thread under tension under the action of a spring during a certain period of the stitch formation process.
  • the thread take-up element is arranged near a position in which the thread-guiding part of the thread take-up element is located when the upper thread loop passes between the rotary stop for the bobbin case. With this arrangement, a uniform and low-noise thread take-off is achieved by the hook. However, it is not possible to take up the loose upper thread released by the thread feeder at the beginning of the needle downward movement and to prevent the formation of a loose thread section leading to the needle eye.
  • a thread regulating device is also known which contains a thread regulating spring deflecting the thread.
  • the object of the invention is to provide a particularly simple thread regulating device for articulated thread levers which optimally picks up the loose thread between the thread take-up lever and the needle eye or the gripper in different phases of a stitch formation cycle.
  • the thread regulating spring can be connected in a simple manner to the thread-guiding part of the thread take-up device by plugging it onto a pin arranged on the thread take-up device and securing it itself by appropriate shaping.
  • the thread passed through the thread take-up lever is fed through the spring clip with reduced thread tension at any time safely tensioned and / or held captive in the thread guide opening.
  • the lower sewing machine arm 3 and the upper arm 5 of the sewing machine 7 are placed on a base plate 1. Behind the upper machine arm 5, a spool of thread 11, which is attached to a spool of thread spool 13, is partially visible.
  • the machine has a schematically illustrated handwheel 15, a needle holder 17 and a needle 19 fastened in the needle holder 17.
  • two vertically running grooves 23 and 25 are visible, which are connected to one another below by a semicircular groove 27.
  • the groove 25 extends over the entire height of the upper sewing machine arm 5. Die Groove 23 continues on the top 20 of the sewing machine arm 5 to the rear.
  • a conventionally designed thread tensioning device 29 is arranged and shown schematically.
  • the thread-leading part 30 of a thread transmitter 31 oscillating in a vertical plane which is explained in more detail in the section according to FIG. 2, is visible.
  • the thread transmitter 31 which is designed, for example, as an articulated thread transmitter, is of a known design and consists of a link 33 which on the one hand can be pivoted on a fixed axis 35 and whose second end is connected to the thread transmitter lever 36 by a joint 37.
  • the thread take-up lever 36 is also connected via a joint 39 to a crank or crank disk 41 in terms of drive.
  • the needle bar 45 is also articulated on the crank or crank disk 41 by means of a connecting rod 43.
  • the drive conditions for the joint thread transmitter 31 were selected such that the movement of the hook-shaped, thread-guiding part 30 runs completely within the sewing machine housing. Accordingly, a relatively sensitive thread regulating spring 47 is also arranged completely protected within the sewing machine housing.
  • the thread regulating spring 47 is attached directly to the three-leg thread take-up lever 36 in the example, the front end of which comprises the thread-guiding part 30.
  • the thread regulating spring 47 preferably has a spring clip 49 which is U-shaped in plan and which surrounds the fader-guiding part 30 of the thread take-up lever 36 on both sides.
  • the thread regulating spring 47 which is made of thin spring wire, has at the attachment point on the thread take-up lever 36 a cylinder jacket-shaped winding package 51, which is pushed onto a pin 53 attached to the thread take-up lever 36.
  • One end 55 of the spring 47 in the region of the winding package 51 is guided tangentially out of the cylindrical jacket-shaped part, bent twice and engages around the thread take-up lever 36.
  • the bent end 55 lies with its outermost section on the thread take-up lever 36 and secures the spring 47 against rotation on the pin 53.
  • the spring clip 49 of the thread regulating spring 47 which is guided around the thread-guiding part 30, also has a bent end 57, which engages in a cylindrical bore 48 in the axis of the pin 53.
  • the thread regulating spring 47 is also bent downward in a V-shape and, together with the hook-shaped part 30, forms a guide opening 59 for one of the spool 11 through the groove 23, via the thread tensioning device 29 and the groove 25 leading to needle 19 upper thread 61.
  • a stop nose 63 and 65 is formed at the top and bottom, which limits the pivoting range of the spring clip 49 upwards and downwards.
  • the upper thread 61 is guided from the thread reel 11 sitting on the thread reel pin 13 of the machine on the upper side 20 via thread deflections (not shown) and through the thread tensioning device 29 to the thread feeder 31.
  • the thread 61 When the thread 61 is inserted into the thread take-up lever 36, the thread first lies on the spring clip 49 of the thread regulating spring 47 and, as soon as the spring is tensioned, slides under the hook-shaped thread-guiding part 30 of the thread take-up lever 36, so that it is in the opening 59 in the loose state Thread regulating spring 47 and fader-guiding part 30 remains trapped and can no longer be unthreaded.
  • the thread-guiding needle 19 moves against a material 4 lying on the arm 3.
  • the thread take-up lever 36 simultaneously performs a faster downward movement than the needle bar 45 with the needle 19, so that loose thread is created between the thread take-up lever 36 and the eye of the needle , which is now taken up by the spring clip 49 of the thread regulating spring 47 so that the thread remains slightly tensioned in the area of the needle 19.
  • the spring clip 49 can only take up thread until it lies against the stop lug 63 of the thread take-up lever 36 and the thread comes into contact with the thread-guiding part 30 at point A. In the meantime, however, the eye of the needle has penetrated the material 4, so that the loose thread can no longer get caught on the needle tip or twist before entering the eye of the needle.
  • the looper in the lower arm 5 now grips the upper thread loop formed in a known manner, expands it and guides it around the lower thread supply in the bobbin case.
  • the loose upper thread between the thread take-up lever 36 and the sewing material 4 is practically completely pulled off.
  • the thread feeder 36 also begins its upward movement, the spring clip 49 initially still storing the maximum possible thread quantity.

Landscapes

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

Claims (10)

  1. Dispositif de régulation de la tension du fil sur une machine à coudre comportant un système articulé de présentation de fil et un ressort de régulation disposé sur le trajet du fil entre le dispositif de tension du fil et le chas de l'aiguille et maintenant le fil tendu par moments, caractérisé par le fait que le ressort (47) est disposé directement sur la partie (30) guidant le fil du levier (36) du système de présentation de fil et qu'il est entraîné par lui sur sa trajectoire pendant la piqûre.
  2. Dispositif de régulation de la tension du fil selon la revendication 1, caractérisé par le fait que le point de fixation du ressort (47) exécute un mouvement de translation avec la partie (30) guidant le fil du levier (36) du système de présentation.
  3. Dispositif de régulation de la tension du fil selon l'une des revendications 1 ou 2, caractérisé par le fait que sur la partie (30) du levier (36) du système de présentation de fil est disposé un téton cylindrique (53) servant d'élément de maintien pour le ressort (47), téton auquel le ressort (47) est attaché fixe en rotation.
  4. Dispositif de régulation de la tension du fil selon la revendication 3, caractérisé par le fait que le ressort (47) comporte un ensemble de spires (51) cylindrique qui est arrêté sur le téton (53) après avoir été glissé sur celui-ci.
  5. Dispositif de régulation de la tension du fil selon la revendication 4, caractérisé par le fait que, de l'ensemble de spires (51) sort un premier segment de fil métallique (55) coudé deux fois, qui est en prise avec le levier (36) du système de présentation de fil, en l'entourant.
  6. Dispositif de régulation de la tension du fil selon l'une des revendications 4 ou 5, caractérisé par le fait que, de l'ensemble de spires (51) sort un étrier de ressort (49) qui est situé latéralement contre la partie (30) guidant le fil et qui forme avec cette partie une ouverture de guidage de fil (59) fermée.
  7. Dispositif de régulation de la tension du fil selon la revendication 6, caractérisé par le fait que l'étrier de ressort (49) entoure la partie (30) guidant le fil, en formant un U.
  8. Dispositif de régulation de la tension du fil selon la revendication 7, caractérisé par le fait que l'extrémité (57) de l'étrier de ressort (49) est recourbée et qu'elle est retenue dans un trou (48) au centre du téton (53).
  9. Dispositif de régulation de la tension du fil selon l'une des revendications 1 à 8, caractérisé par le fait qu'une ouverture de guidage (59) pour le fil (61) est formée, sur la partie (30) guidant le fil du levier (36) du système de présentation du fil, par un nez (67) en forme de crochet disposé sur cette partie et par l'étrier de ressort (49).
  10. Dispositif de régulation de la tension du fil selon la revendication 9, caractérisé par le fait que le fil (61) est maintenu prisonnier dans l'ouverture de guidage (59) du ressort par l'étrier de ressort (49).
EP91810088A 1990-04-05 1991-02-07 Dispositif de contrôle de la tension du fil sur machine à coudre Expired - Lifetime EP0451087B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1153/90A CH681094A5 (fr) 1990-04-05 1990-04-05
CH1153/90 1990-04-05

Publications (2)

Publication Number Publication Date
EP0451087A1 EP0451087A1 (fr) 1991-10-09
EP0451087B1 true EP0451087B1 (fr) 1995-04-05

Family

ID=4203723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810088A Expired - Lifetime EP0451087B1 (fr) 1990-04-05 1991-02-07 Dispositif de contrôle de la tension du fil sur machine à coudre

Country Status (5)

Country Link
US (1) US5131338A (fr)
EP (1) EP0451087B1 (fr)
JP (1) JPH0489273U (fr)
CH (1) CH681094A5 (fr)
DE (2) DE59105071D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1037018C (zh) * 1994-02-08 1998-01-14 周鹤鸣 一种缝纫机用的可调节供线量的五杆挑线机构
DE19617945C1 (de) * 1996-05-04 1997-09-11 Union Special Gmbh Fadensteuerung für eine Kettenstich-Nähmaschine
US6047653A (en) * 1997-06-13 2000-04-11 Cash; David R. Sewing machine with a take-up lever moving up and down through one cycle per revolution of a rotary cylindrical hook base
JP4995447B2 (ja) * 2005-08-16 2012-08-08 株式会社鈴木製作所 偏平縫いミシン
CN105734847B (zh) * 2016-03-07 2018-08-21 徐州力达缝纫设备制造有限公司 带防脱线挑线装置的缝纫机

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE45813C (de) * 1900-01-01 gebr. nothmann in Berlin N., Neue Hochstr. 20 Fadengeber für Nähmaschinen
US197107A (en) * 1877-11-13 Improvement in take-up mechanisms for sewing-machines
US875610A (en) * 1903-03-26 1907-12-31 William N Parkes Thread-controlling mechanism for sewing-machines.
US994509A (en) * 1910-07-09 1911-06-06 Singer Mfg Co Thread-controller for sewing-machines.
US1245338A (en) * 1914-10-03 1917-11-06 Arbetter Felling Machine Company Slack-thread-take-up mechanism for blindstitch sewing-machines.
US1370228A (en) * 1919-10-27 1921-03-01 Thomas E Scully Double take-up spring for needle-bars on sewing-machines
CH421673A (de) * 1965-06-11 1966-09-30 Gegauf Fritz Ag Nadelfadenspanneinrichtung an Nähmaschinen
US4411395A (en) * 1981-08-14 1983-10-25 Riviera Marine & Tackle Co. Downrigger swivel base
US4422395A (en) * 1982-03-12 1983-12-27 The Singer Company Thread handling arrangement with fiber carrying strip and cam
CH668092A5 (de) * 1985-12-06 1988-11-30 Gegauf Fritz Ag Fadensteuerung fuer naehmaschinen.
JPS62170289A (ja) * 1986-01-21 1987-07-27 ブラザー工業株式会社 ミシンの糸取上装置
CA1301555C (fr) * 1986-06-23 1992-05-26 Yoshio Mikuni Releveur de fil pour machine a coudre
JPH0728975B2 (ja) * 1987-03-19 1995-04-05 蛇の目ミシン工業株式会社 ミシンの自動上糸掛け装置
US4856443A (en) * 1987-05-15 1989-08-15 Okamura & Co. Needle thread tensioning device for a swing machine

Also Published As

Publication number Publication date
JPH0489273U (fr) 1992-08-04
DE59105071D1 (de) 1995-05-11
US5131338A (en) 1992-07-21
CH681094A5 (fr) 1993-01-15
EP0451087A1 (fr) 1991-10-09
DE9101845U1 (de) 1991-05-08

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