EP0348436A1 - Coupe-fil pour machines a coudre a point zig-zag. - Google Patents

Coupe-fil pour machines a coudre a point zig-zag.

Info

Publication number
EP0348436A1
EP0348436A1 EP88903802A EP88903802A EP0348436A1 EP 0348436 A1 EP0348436 A1 EP 0348436A1 EP 88903802 A EP88903802 A EP 88903802A EP 88903802 A EP88903802 A EP 88903802A EP 0348436 A1 EP0348436 A1 EP 0348436A1
Authority
EP
European Patent Office
Prior art keywords
thread
cutting
cutting knife
catcher
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.)
Granted
Application number
EP88903802A
Other languages
German (de)
English (en)
Other versions
EP0348436B1 (fr
Inventor
Ernst Albrecht
Harald Dinges
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.)
GM Pfaff AG
Original Assignee
Pfaff Industriemaschinen GmbH
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 Pfaff Industriemaschinen GmbH filed Critical Pfaff Industriemaschinen GmbH
Publication of EP0348436A1 publication Critical patent/EP0348436A1/fr
Application granted granted Critical
Publication of EP0348436B1 publication Critical patent/EP0348436B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • a thread cutting device according to the preamble of claim 1 is known from DE-GM 1 968 920.
  • the 5 cutting blade cooperating with the cutting edge of the thread catcher is fastened to the underside of the throat plate at a lateral distance from the la-hole-shaped stitch hole.
  • the needle in zigzag sewing has a greater distance from the stationary cutting knife in one 1 ° stitch position than in the other, thread lengths of uneven length result on the material to be sewn, the shortest thread ends on the cutting knife facing and the longest thread ends on the cutting knife 15 opposite stitch position are formed.
  • Double chain stitch sewing machines which have a fade catcher movable parallel to the throat plate plane with a cutting edge as well as a cutting knife arranged parallel to the same and movable in the same direction and a thread clamp movable with the cutting knife.
  • the Fade ⁇ fä ⁇ ger is provided with a pin, which is in engagement with a longitudinal slot of the cutting knife and the Fad ⁇ klemme so that the cutting knife and the thread clamp are each carried by the thread catcher from the rest position to the working position and vice versa when the pin the whole Length of the longitudinal slots.
  • this thread cutting device is not for double lockstitch - but for
  • Double chain stitch sewing machines was designed, which also do not serve for the production of zigzag seams but straight stitch seams, it is also not suitable for cutting through thick and tear-resistant threads, which oppose the cutting with such a high resistance that .the force to be cut is greater than the holding force of the spring catch.
  • the cutting knife would be pushed out of the cutting position actually provided close to the tap hole before the threads were completely severed, and the cutting process would only be in the idle position of the cutting knife relatively far away from the tap hole accomplished. In this way there would be undesirably long thread ends on the sewing material.
  • the invention has for its object to provide a thread trimmer for zigzag sewing machines so that regardless of the stitch position of the last stitch, uniformly short thread ends are achieved on the workpiece. This object is achieved by the characterizing features of claim 1.
  • the cutting knife to connect via a positive gear with the drive of the thread catcher, an inevitable coupling of the movement of the thread catcher with that of the cutting knife is achieved, thereby increasing cutting resistance, as z. B. when cutting thick and tear-resistant threads can reliably be overcome.
  • the design of the thread catcher specified in claim 4 brings in connection with the particularly short workpiece ends thread ends improved sewing security at the beginning of the next sewing process. This is done in such a way that immediately after the penetration of the separating tip of Fade ⁇ fnatureers in the 0 needle thread loop of the needle-side loop leg from Garfi ⁇ ger, that is detected by the incision between Garfi ⁇ ger and separator finger and thereby already tightened by Nadelfade ⁇ vorrat during further division process thread. If in the further course of the gripper the needle thread loop around the
  • the gripper thread and the workpiece-side leg of the needle thread loop are behind the barb of the thread catcher.
  • the needle thread then runs from the barb under the thread catcher 0 as a needle-side loop leg to the
  • Figure 1 is a partially sectioned view of part of a sewing machine with the 5 Fade ⁇ sch ⁇ eidvorraum.
  • Figure 2 shows a part of the drive mechanism us the Fade ⁇ schneidvorraum.
  • FIG. 3 shows a diagrammatic representation of the throat plate and the thread cutting device with a view from below of the device parts
  • Fig. 4 is a partially sectioned graphical
  • Fig. 6 shows the course of the thread corresponding to Fig. 5 but with the right stitch position.
  • the sewing machine has a housing (1) which consists of a carrier plate (2), a base (3), a support arm (4), a stand (5) and an arm (6) which is fitted into a head (7) expires.
  • An arm shaft (8) is mounted in the arm (6) and drives a needle bar (11) via a crank (9) and a link (10).
  • a thread-guiding needle (12) is fastened in the needle bar (11).
  • the needle bar (11) is received in a frame (13) which is displaceably mounted on a bolt (14) running parallel to the longitudinal axis of the arm (6) and is connected to a push rod (15) running parallel to it.
  • the push rod (15) forms the output member of a known zigzag stitch actuator, not shown.
  • Such a stitch regulator is shown and described for example in DE-PS 33 20 158.
  • the needle (12) works together to form double lockstitches with a double-rotating gripper (16) which is arranged in the support arm (4) and which contains a rotating gripper body (17) and a fixed bobbin case (18).
  • a throat plate (19) is arranged in the support arm (4) above the gripper (16) and has a stitch hole (20) for the passage of the needle (12).
  • a sewing material holder (21) On the support arm (4) a sewing material holder (21) is arranged, which has a lower clamp jaw (22) and an upper clamp jaw (23).
  • the upper clamp jaw (21) On the support arm (4) a sewing material holder (21) is arranged, which has a lower clamp jaw (22) and an upper clamp jaw (23).
  • the upper clamp jaw (21) On the support arm (4) a sewing material holder (21) is arranged, which has a lower clamp jaw (22) and an upper clamp jaw (23).
  • Klammerbacke ⁇ (23) contains a spring-loaded
  • Roller lever (25) and a substantially vertically movable pressure plate (26) can be lifted off the lower clamp jaw (22).
  • the feed movements of the material holder (21) and the setting of the zigzag stitch actuator are controlled by a cam, not shown, as is disclosed in the aforementioned DE-PS 33 20 158.
  • a cutting knife (28) designed as a flat slide is slidably arranged in a flat guide groove (27) provided on the underside of the throat plate (19) in the region of the stitch hole (20) and parallel to the circumferential plane of the gripper (16).
  • the cutting knife (28) contains a rectangular recess (29), the lower left-hand limitation border of which, according to the drawing, forms a cutting edge (30).
  • the cutting knife (28) is screwed onto the throat plate (19) by " two Guide pieces (31) held against falling.
  • Fade ⁇ f ⁇ ngers (33) is curved upwards by a small amount and runs out into an essentially centrally located elongated separating tip (34).
  • a short holding finger (35) is provided at a small lateral distance from the separating tip (34), as a result of which an incision (36) is formed between the separating tip (34) and holding finger (35), which has a groove-like shape.
  • the Fade ⁇ fä ⁇ ger (33) has in its upwardly curved section a la ⁇ glochartig, essentially longitudinal recess. (37), whose end facing the separating tip (34) lies in the apex plane of the curved section t, as a result of which the semicircular upper beginning of the recess (37) forms a cutting edge (38).
  • the thread catcher (33) there is also a recess (39) extending obliquely in the direction of the recess (37), whereby a barb (41) is formed in connection with the longitudinal edge (40).
  • the drive lever (45) is connected via a hinge pin (47) to a pull rod (48), the opposite end of which is bent downwards.
  • the pull rod (48) has a longitudinal, straight guide slot (49) in the cranked section and carries a short, upwardly projecting pin (50).
  • a hinge pin (51) which is fastened to the throat plate (19) and on which a flat angle lever (52) is mounted, engages in the guide slot (49).
  • a control slot (53) in which the pin (50) engages is provided in the one leg of the angle lever (52), which extends between the cranked section of the pull rod (48) and the throat plate (19).
  • the control slot (53) is divided into two standstill sections (54, 55) and a movement section (56) arranged between them.
  • a pull rod (59) One end of a pull rod (59), the other end of which is connected to a carrier (60), engages on the pivot pin (47) of the drive lever (45).
  • the carrier (60) is fastened on a rotatably mounted and axially displaceable sliding rod (61).
  • a scanning lever (62) On the slide rod (61), a scanning lever (62) is attached, which has a cam follower (63).
  • the scanning lever (62) interacts with a cam disk (65) which has a cam groove (66) and is fastened on a shaft (67).
  • the shaft (67) is connected to the arm shaft (8) via a toothed gear (68)
  • the scanning lever (62) is a
  • Electromagnet (69) (Fig. 2) assigned, which acts on the pull rod (70) arranged pressure piece (71) on the underside of the scanning lever (62).
  • the scanning lever (62) is also assigned a pawl (72) which has two stepped shoulders (73, 74) and is arranged on a shaft (75) in a rotationally fixed manner.
  • a prestressed leg spring (76) arranged on the shaft (75), which is at one end on a rib of the
  • a three-armed lever (78) 25 is arranged on a shaft (77) in a rotationally fixed manner. There is one on one arm
  • Switch rod (79) articulated, which has a guide slot (80) in which a housing-fixed pin (81) engages. At the free end of the shift rod (79) a wedge-shaped extension ('82) is formed, which cooperates with an appropriately designed extension (83) of the locking pawls (72). On another arm of the lever (78) is a tie rod
  • a one-armed drive lever (88) is also attached to the shaft (77).
  • a free shoulder (89) formed on the scanning lever (62) is assigned to the free end of the drive lever (88).
  • the electromagnet (69) is acted upon, after which it moves the scanning lever (62) from the position shown in FIG. 2 pivots upwards and thereby swivels the cam follower (63) into a standstill section of the cam groove (66) which runs without an incline and is not designated in any more detail.
  • the thread catcher (33) and the cutting knife (28) are in the rest position with a lateral distance from the tap hole (20).
  • the leg spring (76) pivots the pawl (72), based on FIG. 2, to the right, as a result of which the shoulder (74) slides under the front end of the scanning lever (62) and opens up this way ensures its position.
  • Incision (36) between the separating tip (34) and the holding finger (35) is detected.
  • the needle thread loop is completely guided around the spool capsule (18) by the gripper (16) and the thread catcher (33) penetrates so far the needle thread loop until the thread leg (NW) leading to the sewing material (W) and the looper thread (G) slide off the longitudinal edge (40) and reach behind the barb (41) into the recess (39).
  • the sewing machine is pulled upwards, laying itself around the thread catcher (33) such that the needle-side loop leg (NN) from the tap hole (20) via the incision (36) and the two cutouts (39 and 37) to the cutting edge (38) and the workpiece-side loop leg (NW) runs from the cutting edge (38) to the tap hole (20).
  • Movement section (56) occurs, it causes a pivoting of the angle lever (52) and thus a displacement of the cutting knife (28), this movement taking place essentially synchronously with the movement of the fade pin 5 (33). If the pin (50) the end of the Has reached the movement section (56), the cutting edge (30) is below the center of the tap hole (20), the cutting knife (28) having reached its cutting position. During the subsequent movement of the pin (50) within the standstill section (55), the winding lever (52) remains unchanged in its new position, whereby the cutting knife (28) also remains in the cutting position.
  • the sewing machine is stopped shortly after the top dead center of the needle movement.
  • the cam follower (63) is located at the apex of the movement section (66a) which is arc-shaped in the axial direction, the thread catcher (33) and the pull rod (48) having reached their right-hand end position in relation to the drawing.
  • the electromagnet (85) is acted upon, whereupon it pivots the three-armed lever (78) and the drive lever (88), based on FIG. 1, counterclockwise. Because of this pivot movement, the pressure plate (26) is actuated via the pull rod (84) and the holding plate (24) is raised. At the same time, the shift rod (79), based on FIG. 1, is pulled to the right and the pawl (72) is pivoted back against the action of the leg spring (76) via the wedge-shaped extension (82), which interacts with the extension (83) , whereupon the leg spring (64) pivots the scanning lever ' (62) downward again and thereby removes the cam follower (63) from the cam groove (66). As soon as the cam follower (63) is out of engagement with the cam groove (66), the free end of the drive lever (88) rests against the shoulder (89) and then shifts the scanning lever (62) axially Direction back to the starting position shown in Fig. 1.

Landscapes

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

Abstract

La lame (28) de coupe-fil est mobile sur un plan parallèle à l'attrape-fil (33) et reliée par un mécanisme de transmission (45 à 58) à sections d'arrêt (54, 55) avec l'entraînement de l'attrape-fil (33) de façon à pouvoir se déplacer avec ce dernier jusqu'à la position de coupe au-dessous du centre du trou de l'aiguille. Pendant que la lame (28) du coupe-fil reste stationnaire dans la position de coupe, l'attrape-fil achève l'opération de séparation des fils. La lame (28) du coupe-fil ne se déplace en arrière qu'une fois que les fils ont été sectionnés pendant le mouvement en arrière de l'attrape-fil (33). Le mécanisme (45 à 58) de transmission de la lame (28) du coupe-fil est craboté, ce qui permet de sectionner de manière fiable même de gros fils.
EP88903802A 1987-05-09 1988-04-19 Coupe-fil pour machines a coudre a point zig-zag Expired - Lifetime EP0348436B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3715603A DE3715603C1 (de) 1987-05-09 1987-05-09 Fadenschneidvorrichtung fuer Zickzack-Naehmaschinen
DE3715603 1987-05-09

Publications (2)

Publication Number Publication Date
EP0348436A1 true EP0348436A1 (fr) 1990-01-03
EP0348436B1 EP0348436B1 (fr) 1992-09-30

Family

ID=6327241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88903802A Expired - Lifetime EP0348436B1 (fr) 1987-05-09 1988-04-19 Coupe-fil pour machines a coudre a point zig-zag

Country Status (8)

Country Link
US (1) US5005504A (fr)
EP (1) EP0348436B1 (fr)
JP (1) JP2912374B2 (fr)
KR (1) KR950012454B1 (fr)
BR (1) BR8807499A (fr)
DE (1) DE3715603C1 (fr)
ES (1) ES2007485A6 (fr)
WO (1) WO1988008894A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132991C1 (en) * 1991-10-04 1992-12-03 Duerkopp Adler Ag, 4800 Bielefeld, De Producing seam having short thread ends on bottom of workpiece - involves drawing back needle thread from underside of workpiece so that only short thread piece remains on underside
US5333565A (en) * 1992-10-30 1994-08-02 Mim Industries, Inc. Thread cutting via reciprocating arm with pockets and a trimming plate
US5289791A (en) * 1993-03-31 1994-03-01 General Motors Corporation Sewing machine with thread wiper and auxiliary cutter
DE4323494C1 (de) * 1993-07-14 1994-08-18 Union Special Gmbh Fadentrenneinrichtung für eine Zylinderarm-Kettenstichnähmaschine
JP2880406B2 (ja) * 1994-06-29 1999-04-12 ジューキ株式会社 ミシンの下糸端保持装置
US6062152A (en) * 1998-05-12 2000-05-16 Capital Automation Co., Ltd. Automatic thread cutting device for an embroidery machine
JP4245222B2 (ja) * 1999-03-24 2009-03-25 Ｊｕｋｉ株式会社 ミシンの下糸切断装置
CN100350091C (zh) * 2003-12-08 2007-11-21 星锐缝纫机股份有限公司 横式直筒缝纫机
US6904854B1 (en) * 2003-12-15 2005-06-14 Shing Ray Sewing Machine Co., Ltd. Transverse longitudinal-cylinder sewing machine
US6968793B2 (en) * 2003-12-15 2005-11-29 Shing Ray Sewing Machine Co., Ltd. Transverse longitudinal-cylinder sewing machine
JP2006102399A (ja) * 2004-10-08 2006-04-20 Juki Corp ミシン
JP5115226B2 (ja) * 2008-02-07 2013-01-09 ブラザー工業株式会社 ミシンの糸切り装置
CH704524A1 (de) * 2011-02-28 2012-08-31 Bernina Int Ag Verfahren zum Schneiden des Unter- und mindestens eines Oberfadens und ein Verfahren zum Ansticken sowie eine Vorrichtung zur Durchführung der Verfahren.
DE102021128687A1 (de) 2021-11-04 2023-05-04 Bundesdruckerei Gmbh Klemmvorrichtung für einen Hinter- oder Unterfaden einer Nähmaschine

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE155166C (fr) * 1901-01-31
US2376417A (en) * 1944-06-13 1945-05-22 Chudner Joseph Thread cutter
US2968269A (en) * 1959-06-24 1961-01-17 Singer Mfg Co Thread cutting mechanisms for sewing machines
FR1284956A (fr) * 1960-04-04 1962-02-16 Pfaff Ag G M Procédé pour la coupe du fil supérieur et du fil inférieur, dans les machines à coudre à point de navette, et dispositif pour la mise en oeuvre de ce procédé
US3413944A (en) * 1965-10-01 1968-12-03 American Safety Table Co Thread severing attachment for sewing machine
ES354872A1 (es) * 1967-07-07 1969-11-16 Rimoldi C Spa Virginio Dispositivo para cortar contemporaneamente los hilos de co-sido de una maquina de coser.
US3602170A (en) * 1969-03-24 1971-08-31 Aisin Seiki Thread cutter in sewing machine
DE1941794A1 (de) * 1969-08-16 1971-03-18 Pfaff Ag G M Fadenschneideinrichtung an Doppelsteppstichnaehmaschinen
DE2124646A1 (de) * 1970-05-20 1971-12-02 Csepeli Kerekpar es Varrogepgyar, Budapest Fadentrennvorrichtung für Häkelstich-Nähmaschinen
US3701329A (en) * 1971-01-04 1972-10-31 Honeywell Inf Systems Stitch control mechanisms and thread cutter
US3709176A (en) * 1971-10-08 1973-01-09 Singer Co Underbed thread trimming mechanism for sewing machines
SU400639A1 (ru) * 1971-12-24 1973-10-01 Подольский ордена Ленина , ордена Трудового Красного Знамени механический завод М. И. Калинина Приспособление для обрезки нитей игл и петлителя на плоскошовной швейной машине
US4365568A (en) * 1980-05-15 1982-12-28 The Singer Company Underbed thread trimmer and controlled single-operation cam mechanism therefor
DE3124795C1 (de) * 1981-06-24 1982-11-04 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenabschneidvorrichtung fuer Zickzack-Naehmaschinen
DE8316282U1 (de) * 1983-06-03 1985-12-19 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Vorschubantrieb für eine Stichgruppennähmaschine
JPS6168084A (ja) * 1984-09-10 1986-04-08 ブラザー工業株式会社 ミシンの糸切り装置
US4566395A (en) * 1984-11-05 1986-01-28 Clinton Industries, Inc. Sewing machine needle thread capturing and severing mechanism
JPS62298393A (ja) * 1986-06-19 1987-12-25 ペガサスミシン製造株式会社 シリンダ−ミシンの糸切断装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8808894A1 *

Also Published As

Publication number Publication date
EP0348436B1 (fr) 1992-09-30
KR890700708A (ko) 1989-04-26
KR950012454B1 (ko) 1995-10-18
WO1988008894A1 (fr) 1988-11-17
DE3715603C1 (de) 1988-06-23
US5005504A (en) 1991-04-09
ES2007485A6 (es) 1989-06-16
BR8807499A (pt) 1990-05-08
JPH02503389A (ja) 1990-10-18
JP2912374B2 (ja) 1999-06-28

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