EP0417119B1 - Procede pour realiser une couture - Google Patents

Procede pour realiser une couture Download PDF

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Publication number
EP0417119B1
EP0417119B1 EP89905090A EP89905090A EP0417119B1 EP 0417119 B1 EP0417119 B1 EP 0417119B1 EP 89905090 A EP89905090 A EP 89905090A EP 89905090 A EP89905090 A EP 89905090A EP 0417119 B1 EP0417119 B1 EP 0417119B1
Authority
EP
European Patent Office
Prior art keywords
thread
needle
stitch
sewing machine
griffer
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
EP89905090A
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German (de)
English (en)
Other versions
EP0417119A1 (fr
Inventor
Walter Hager
Reinhold Dobner
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
GM Pfaff 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 GM Pfaff AG filed Critical GM Pfaff AG
Publication of EP0417119A1 publication Critical patent/EP0417119A1/fr
Application granted granted Critical
Publication of EP0417119B1 publication Critical patent/EP0417119B1/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
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/20—Control devices responsive to the number of stitches made

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • a sewing machine is known, on the housing of which a guide groove is formed close to the gripper, at the end of which is turned away from the gripper a cutting device is arranged.
  • the guide groove is used to hold the thread end of the old hook thread coming from the material and after changing the bobbin to hold the thread start of the new hook thread.
  • the sewing process is continued, the new looper thread being knotted with the needle thread at the first stitch and pulled to the stitch formation point, while the old looper thread is gradually pulled out of the guide groove by the feed movement of the sewing material.
  • the invention has for its object to provide a method for producing a seam in which the needle thread runs uninterrupted and both the knotting with the old and the knotting with the new looper thread should be safe, so that the strength of the seam is not weakened .
  • the changeover of the stitch regulator to the reverse stitch after a malfunction of the looper thread causes the sewing material to be moved back relative to the needle to the puncture hole formed before the malfunction of the thread, at which the last properly formed knot with the old looper thread took place.
  • the stitch regulator After feeding new looper thread by thread retraction from the bobbin in double lockstitch sewing machines or from an endless thread supply in multi-thread chainstitch sewing machines when thread breaks or after changing the bobbin in double lockstitch sewing machines at the end of the thread, the stitch regulator is set to zero so that the needle thread depends on the The number of stitches that are subsequently executed is knotted once or several times in the same puncture hole with the new hook thread. A multiple knot provides greater security against loosening this knot. Since the old and the new looper thread are knotted next to each other on an almost punctiform surface with the uninterrupted needle thread in the puncture hole, this connection point proves to be just as resilient as the rest of the seam.
  • the seam formation is continued by changing the stitch regulator to the forward stitch.
  • the measure of claim 2 has the effect that the free ends of the old and the new looper thread hanging down from the material to be sewn are shortened to such an extent that when the seam is continued they will certainly not be gripped by the looper and integrated into the seam.
  • an arm shaft (3) which carries a pulse disk (4) of a pulse generator (5).
  • a wider marking (6) and a narrower marking (7) are formed offset from one another on the pulse disk (4).
  • the markings (6, 7) can be monitored by a sensor device (8) of the pulse generator (5).
  • crank (10) is articulated eccentrically on a disc (9) formed in one piece with the arm shaft (3), the opposite end of which engages via a clamp (11) on a needle bar (12) which carries a needle (13) .
  • the sewing machine (1) has a fabric pusher (15) which protrudes through slots in a needle plate (16) (FIG. 4) accommodated by the base plate (14) .
  • the fabric pusher (15) is carried by a fabric pusher carrier (17) (FIG. 1), the fork-shaped end of which engages around an eccentric (19) attached to a shaft (18), the shaft (18) passing the fabric pusher (15) per stitch formation cycle issued a lifting movement.
  • the free end of the The fabric pusher carrier (17) pivots on a pin of a rocker (20).
  • the rocker (20) is fork-shaped with arms and is arranged in a rotationally fixed manner on a shaft (21) which gives the fabric pusher (15) a feed movement per stitch formation cycle.
  • a double lockstitch hook (24) is attached just below the fabric slide (15).
  • a thread monitor (25) and a cutting device (26) are assigned to the gripper (24).
  • the elements required for the function of the thread monitor (25) are shown enlarged in FIGS. 2 and 3.
  • the bobbin case (27) of the hook (24) is provided with an annular wall in which an outlet opening (28) for the hook thread of a bobbin (29) is formed.
  • the ends of a groove (30) which forms a guide surface and is provided on at least part of the circumference of the bobbin case (27) adjoin the outlet opening (28).
  • a deflection surface (31) for light rays is recessed in the wall of the bobbin case (27).
  • the deflection surface (31) is provided behind the outlet opening (28) in the thread withdrawal direction and is monitored by a photodiode (32) and a photodetector (33) of the thread monitor (25) designed as a phototransitor.
  • the deflection surface (31) is inclined relative to the photodetector (33) in the wall of the bobbin case (27), on the outside of which a spring (34) is fastened for tensioning the looper thread.
  • the cutting device (26) of the sewing machine (1) is in Fig. 4 shown enlarged.
  • the thread catcher (35) of the cutting device (26) provided for gripping the hook thread is arranged coaxially with the hook (24) and interacts with a cutting knife (36), indicated by dash-dotted lines, on the underside of the base plate (14).
  • the thread catcher (35) is fastened to a support arm (37) which is connected to a ring (38) which loosely surrounds the hook drive shaft (22). This is secured in the axial direction and rotatably mounted in a ring element (39) which is attached below the base plate (14).
  • a link (40) is articulated on the support arm (37) and is connected to an arm of an angle lever (41) which is supported by a bearing block (42) fixed to the housing.
  • the other arm of the angle lever (41) is connected via a link (43) to the piston rod of a pneumatic cylinder (44) designed as a pressure intensifier.
  • FIG. 1 On the stitch regulator drive shaft (23) (Fig. 1), two eccentrics (45, 46) are arranged in a rotationally fixed manner.
  • An eccentric rod (47) encompassing the eccentric (45) is connected at its opposite end in an articulated manner to a rocker (48) fastened to the shaft (18).
  • a second eccentric rod (49) encompassing the eccentric (46) is articulated on a pin (50) on which a link (51) is mounted, which is supported by means of a pin (52) with a crank attached to the shaft (21) (53) is connected.
  • a link (54) engages on the pin (50) and engages around a pin (56) carried by a crank (55).
  • the effective length of the handlebar (51) is equal to the effective length of the handlebar (54), so that when the two pins (52 and 56) are aligned, the shaft (21) in spite of the moving eccentric rod (49) at rest remains.
  • the crank (55) is clamped on an adjusting shaft (57).
  • the adjusting shaft (57) carries a two-armed crank (58), on one arm of which a tension spring (59) attached to the housing of the sewing machine (1) engages.
  • the other arm of the crank (58) rests on a pneumatic two-position cylinder (60) which has two piston rods (61 and 62) and a cylinder jacket (63) divided into two chambers for receiving the piston rods (61 and 62).
  • the piston rod (61) is attached to a housing part (2), while the piston rod (62) rests on the underside of the arm of the crank (58).
  • the crank (58) is connected via a pull rod (64) to one end of a rocking lever (65) which is fastened on a shaft (66) which is mounted in the housing and carries a shift lever (67).
  • the still free end of the rocker arm (65) has a spherical projection (68) which projects between the side walls of an adjusting groove (69) of an adjusting wheel (70) which is rotatably arranged on an axis fixed to the housing.
  • the elements (50 to 70) form a stitch regulator (71), the stitch length being set in a known manner by turning the setting wheel (70).
  • the sewing machine (1) is provided with a control device (72), which is shown in simplified form in FIG. 5.
  • the thread monitor (25) has a regulated voltage source, the positive pole of which has current through the photodiode (32) and a resistor (73) to ground flows. Current also flows from the positive pole of the voltage source via the phototransistor (33) and a resistor (74) to ground.
  • the emitter of the phototransistor (33) is connected via a negation element (75) to an input (E 1) of a microcomputer (76).
  • the sensor device (8) of the pulse generator (5) is connected to the input (ZE 1) of a counter (77).
  • This has two outputs (ZA 1 and ZA 2), of which the output (ZA 1) is connected to an input (E 2) and the output (ZA 2) to an input (E 3) of the microcomputer (76).
  • An input (ZE 2) of the counter (77) can be reset to zero via a line connected to an output (A 1) of the microcomputer (76).
  • the microcomputer (76) has an input (E 4) which can be controlled via a foot pedal (not shown) of the sewing machine (1).
  • A2 to A5 of the microcomputer (76) are connected to the pressure switching magnets of two 4/2-way valves (78 and 79) via four amplifiers (not shown) and four lines.
  • the directional control valves (78 and 79) are used for the controlled actuation of the two-position cylinder (60) and are supplied by a compressed air source (80).
  • An output (A6) of the microcomputer (76) is connected via an amplifier and a line (not shown) to the pressure switching magnet of a 3/2-way valve (81) which is connected to the compressed air source (80) via a throttle (82).
  • An output of the cylinder (44) controlled by the 3/2-way valve (81) is connected to an adjustable throttle (83).
  • the outputs (A7 to A11) of the microcomputer (76) are connected via lines to a known control circuit, not shown, of a positioning motor (84) which is in drive connection with the arm shaft (3) via a belt drive (85).
  • the arrangement works as follows: After it emerges from the bobbin case (27), the looper thread is guided in at least one thread turn on its circumference in the groove (30). The looper thread covers part of the deflecting surface (31).
  • the light rays of the photodiode (32) strike the looper thread and, in the case of a larger deflecting surface (31), the exposed parts thereof on both sides of the looper thread. Due to the inclination of the deflecting surface (31) relative to the photodetector (33), the light beams striking the deflecting surface (31) are reflected in a direction in which they cannot be received by the photodetector (33). A part of the scattered light rays reflected on the looper thread, however, reaches the photodetector (33).
  • the scattered rays cause the photodetector (33) to conduct and current flows through the resistor (74) to ground.
  • the voltage thus applied to the emitter is passed on to the negation element (75), at whose output there is no voltage as long as the photodetector (33) is conductive. If, on the other hand, the looper thread is broken or used up so far that the deflection surface (31) is exposed, no more light rays enter the photodetector (33). While there is no signal at the input of the Negation element (75) is present, a signal is output at its output and fed to the input (E1) of the microcomputer (76).
  • the signal from the thread monitor (25) causes the microcomputer (76) to emit a signal at its output (A7), by means of which the operating speed of the positioning motor (84) is reduced to a significantly lower speed.
  • the microcomputer (76) receives at its inputs (E2 and E3) the signals emitted by the counter (77) of the pulse generator (5).
  • the counter (77) is put into operation by the entry of one of the markings (6, 7) into the monitoring area of the sensor device (8) and receives a signal at its input (ZE1) until the marking (6, 7) Has left the monitoring area again. As long as the signal is present at the input (ZE1), the counter (77) counts upwards from the value zero, the marking (6), which indicates the lower reversal point of the needle bar (12), being assigned a higher value than because of its greater width the mark (7) which indicates the upper turning point of the needle bar (12). When the higher value is reached, the counter (77) outputs a signal to the microcomputer (76) at its output (ZA1), whereas the lower value outputs a signal at its output (ZA2). After each signal arriving at the inputs (E2 or E3) of the microcomputer (76), the latter outputs a signal at its output (A1), whereby the counter (77) is reset to zero.
  • a signal After a reverse transport stroke, a signal reaches the output (ZA2) of the counter (77) at the input (E3) of the microcomputer (76).
  • the needle (13) is then in its upper reversal point above the penultimate puncture hole of the material (Fig. 6b).
  • the microcomputer (76) outputs a signal to the positioning motor (84) at its output (A9).
  • a stitch is formed after a signal is emitted at the output (A10) of the microcomputer (76). After the needle (13) has returned to its upper reversal point, this process can be repeated several times for a particularly tight knot.
  • Fig. 6c shows the needle (13) on its way to the upper turning point.
  • the 3/2-way valve (81) is reversed by emitting a signal at the output (A6) of the microcomputer (76), so that the piston rod of the cylinder (44) extends and the cutting knife (36) drives to cut the two free ends of the looper threads (Fig. 6d).
  • the throttle (82) is effective to delay the time to switch back the 3/2-way valve (81) and the throttle (83) to reduce the piston speed when the piston is retracted.
  • the microcomputer (76) After thread cutting, the microcomputer (76) outputs a signal to the 4/2-way valve ((79) at its output (A5), causing the piston rod (62) to retract and its free end to position (a) (Fig. 5).
  • the stitch adjuster (71) is thus set again to the forward stitch, and the positioning motor (84) is then accelerated to the working speed again by outputting a signal at the output (A11) of the microcomputer (76) and the seam formation continued.

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

Abstract

Dans une machine à coudre connue, l'aiguillée n'est pas vraiment coupée lorsque l'on arrive à la fin du fil de dessous, toutefois, il existe un vide entre le point de liaison de l'aiguillée avec l'extrémité de l'ancien fil de dessous et celui de l'aiguillée avec l'extrémité du nouveau fil de dessous. L'invention a donc pour objet d'éliminer ce point faible dans la couture du côté faisant face à la navette. Après une rupture ou la fin d'un fil, le tissu à coudre est déplacé vers l'arrière d'une longueur de point, un nouveau fil de dessous est avancé et noué par au moins un point avec l'aiguillée dans le même trou de piqûre, dans lequel l'ancien fil de dessous est également noué en séquence correcte avec l'aiguillée. Ce procédé s'utilise pour faire des coutures avec des machines à coudre.

Claims (2)

  1. Procédé pour réaliser une couture, réalisée sans interruption, sur sa face tournée vers l'aiguille d'une machine à coudre et couture lors de la réalisation de laquelle, suite à une perturbation sur le fil de dessous, le fonctionnement de la machine à coudre est interrompu et un nouveau fil de dessous est amené, caractérisé en ce qu'après manifestation de la perturbation, le cycle de formation de points commencé est mené à sa fin, la machine à coudre (1) est stoppée dans la position de plongée d'aiguille, le règle-point (71) est placé un point en arrière, la machine à coudre (1) est placée en position d'aiguille relevée, le règle-point (71) est réglé à zéro et, après avoir éliminé la perturbation, au moins une formation de point est opérée, en vue d'opérer un noeud entre le nouveau fil de dessous et le fil de dessus, dans le trou de piguage de l'aiguille (13) formé avant manifestation de la perturbation, et la formation de la couture est continuée avec la longueur de point initiale.
  2. Procédé selon la revendication 1, caractérisé en ce que, après nouage du nouveau fil de dessous avec le fil de dessus, les extrémités libres de l'ancien et du nouveau fil de dessous sont détachées.
EP89905090A 1988-06-04 1989-04-28 Procede pour realiser une couture Expired - Lifetime EP0417119B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3819059A DE3819059A1 (de) 1988-06-04 1988-06-04 Verfahren zum herstellen einer naht
DE3819059 1988-06-04

Publications (2)

Publication Number Publication Date
EP0417119A1 EP0417119A1 (fr) 1991-03-20
EP0417119B1 true EP0417119B1 (fr) 1992-12-16

Family

ID=6355865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89905090A Expired - Lifetime EP0417119B1 (fr) 1988-06-04 1989-04-28 Procede pour realiser une couture

Country Status (8)

Country Link
US (1) US5078068A (fr)
EP (1) EP0417119B1 (fr)
JP (1) JPH04504961A (fr)
KR (1) KR900702117A (fr)
BR (1) BR8907469A (fr)
DE (1) DE3819059A1 (fr)
ES (1) ES2014142A6 (fr)
WO (1) WO1989012130A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116788C1 (fr) * 1991-05-23 1992-06-25 G.M. Pfaff Ag, 6750 Kaiserslautern, De
JP2871176B2 (ja) * 1991-05-31 1999-03-17 ブラザー工業株式会社 ステッチバック機能付きミシン
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
US5417173A (en) * 1991-10-24 1995-05-23 Yamato Mishin Seizo Kabushiki Kaisha Method of cutting threads in a sewing machine and device for performing the same
JP3146459B2 (ja) * 1991-11-06 2001-03-19 ブラザー工業株式会社 電子制御式刺繍ミシン
JPH05137864A (ja) * 1991-11-20 1993-06-01 Brother Ind Ltd 電子制御式刺繍ミシン
US5359949A (en) * 1992-05-18 1994-11-01 Brother Kogyo Kabushiki Kaisha Sewing system having function to store operation-state data upon detection of abnormality
US5839679A (en) * 1994-10-26 1998-11-24 Juki Corporation Bobbin thread winding apparatus
US5788171A (en) * 1995-07-12 1998-08-04 Juki Corporation Method and apparatus for detecting residual bobbin thread in a sewing machine
IT1398702B1 (it) * 2009-12-17 2013-03-08 Conti Complett Spa Dispositivo e procedimento di controllo della lunghezza di agugliata in macchine cucitrici con punto a filza.
ITVI20120044A1 (it) * 2012-02-27 2013-08-28 Conti Complett Spa Metodo per l'unione rapida fra due agugliate in macchine cucitrici con punto a filza
CN107326555B (zh) * 2017-08-07 2020-01-31 杰克缝纫机股份有限公司 一种缝纫机
JP7224178B2 (ja) * 2018-12-28 2023-02-17 株式会社ジャノメ ミシン及び返し縫いの制御プログラム

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942128C (de) * 1951-08-09 1956-04-26 Pfaff Ag G M Verfahren zum mechanischen Spulenwechsel bei Naehmaschinen und Einrichtung zur Durchfuehrung des Verfahrens
SE334531B (fr) * 1969-06-09 1971-04-26 Husqvarna Vapenfabriks Ab
JPS5818110B2 (ja) * 1976-12-27 1983-04-11 蛇の目ミシン工業株式会社 ミシンのバツク縫い装置
US4195582A (en) * 1978-09-14 1980-04-01 Teledyne Mid-America Corporation Sewing machine stitching control system
US4336761A (en) * 1980-05-22 1982-06-29 Suave Shoe Corporation Automatic sewing apparatus
JPS6055150B2 (ja) * 1981-10-14 1985-12-03 三菱電機株式会社 模様縫いミシン
DE3150141C1 (de) * 1981-12-18 1983-08-25 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Naehmaschine mit einer Einrichtung zur Herstellung von Eckennaehten
DE3431374A1 (de) * 1983-10-10 1985-04-18 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenwaechter fuer naeh-, stick- und tuftingmaschinen o.dgl.
DE8333709U1 (de) * 1983-11-24 1986-01-16 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Nähmaschine mit einstellbarem Nadel -und Untertransport und einer Einrichtung zum Ansteuern eines vorbestimmbaren Endpunktes einer Naht
US4934292A (en) * 1987-10-02 1990-06-19 Mardix Bar Cochva Sewing apparatus including an arrangement for automatically monitoring the bobbin thread, and a bobbin particularly useful in such apparatus

Also Published As

Publication number Publication date
JPH04504961A (ja) 1992-09-03
WO1989012130A1 (fr) 1989-12-14
ES2014142A6 (es) 1990-06-16
DE3819059C2 (fr) 1990-04-26
KR900702117A (ko) 1990-12-05
EP0417119A1 (fr) 1991-03-20
US5078068A (en) 1992-01-07
DE3819059A1 (de) 1989-12-14
BR8907469A (pt) 1991-05-21

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