EP0413699B1 - Machine a coudre avec dispositif de transport de l'aiguille - Google Patents

Machine a coudre avec dispositif de transport de l'aiguille Download PDF

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Publication number
EP0413699B1
EP0413699B1 EP89904043A EP89904043A EP0413699B1 EP 0413699 B1 EP0413699 B1 EP 0413699B1 EP 89904043 A EP89904043 A EP 89904043A EP 89904043 A EP89904043 A EP 89904043A EP 0413699 B1 EP0413699 B1 EP 0413699B1
Authority
EP
European Patent Office
Prior art keywords
needle
feed
sewing machine
advance
control unit
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
EP89904043A
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German (de)
English (en)
Other versions
EP0413699A1 (fr
Inventor
Mathias Ulmen
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.)
Pfaff Industriemaschinen GmbH
GM Pfaff AG
Original Assignee
Pfaff Industriemaschinen GmbH
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 Pfaff Industriemaschinen GmbH, GM Pfaff AG filed Critical Pfaff Industriemaschinen GmbH
Publication of EP0413699A1 publication Critical patent/EP0413699A1/fr
Application granted granted Critical
Publication of EP0413699B1 publication Critical patent/EP0413699B1/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
    • D05B27/00—Work-feeding means
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/10—Work-feeding means with rotary circular feed members
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines
    • D05B19/02—Sewing machines having electronic memory or microprocessor control unit
    • D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
    • D05B19/16—Control of workpiece movement, e.g. modulation of travel of feed dog
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/05—Magnetic devices
    • D05D2207/06—Permanent magnets

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • a sewing machine with a fixed needle bar guide is known from DE-PS 35 16 715.
  • the feed takes place exclusively via the sliding wheel and roller foot, whereby both feed units are each connected to their own stepper motor drive.
  • the feed units are driven here - in contrast to the sewing machine with needle feed - only during the cut out phase of the needle.
  • the invention specified in claim 1 is therefore based on the object of making the feed drive by the needle switchable on and off in a sewing machine with a needle feed.
  • the sewing machine consists of the base plate (1), the column (2), the stand (3), the arm (4) and the head (5).
  • a main shaft (6) is mounted in the arm (4) in a conventional manner and is driven by a sewing motor (8) attached below the base plate (1) via a V-belt (7).
  • the main shaft (6) is driven by a toothed belt (9), a gripper shaft (10) mounted in the base plate (1), which is in drive connection with a gripper (not shown).
  • the main shaft (6) drives a needle bar (14) equipped with the needle (13) via a crank (11) and a link (12).
  • the handlebar (12) is articulated to the needle bar (14) via an articulated connection (15) (Fig. 2).
  • This is mounted in a rocker (17) carried by an oscillating shaft (16) (FIG. 1).
  • the oscillating shaft (16) is parallel to the main shaft (6) stored in the arm (4).
  • the end of the oscillating shaft (16) projecting into the stand (3) carries a lever arm (18) which is connected to an eccentric rod (20) via a joint pin (19). This engages around an eccentric (21) (Fig. 4) which is fixedly connected to a drive shaft (22) of a stepper motor (23) fastened in the arm (4).
  • the eccentric (21) is guided with a pin (24) in a housing bore (25) running coaxially to the drive shaft (22).
  • a carrier (30) is mounted on an eccentric bolt (31) which has bearing pins (34 and 35) projecting into bores (32 and 33) in the column (2).
  • the bearing journal (35) is provided with a slot (36).
  • the eccentric (31) is clamped to the carrier (30) by a screw (37).
  • a standing shaft (38) is mounted in the carrier (30) and is guided in the axial direction by an adjusting ring (39) and a coupling (40).
  • the carrier (30) is equipped at the lower end with a flange plate (41) on which a stepper motor (42) is fastened, the drive shaft (43) of which is rigidly coupled to the standing shaft (38) by the coupling (40).
  • the standing shaft (38) carries a pinion (44) of a spiroid gear (45), the ring gear (46) of which is firmly connected to a sliding wheel (47) which is ball-bearing-mounted in a known manner and an inner part with an axle stub (48) having.
  • This is received by a bore in an arm (30a) of the carrier (30) and can be clamped by a screw (49) after adjustment in the axial direction.
  • the slide wheel (47) can be adjusted in height by means of the support (30) relative to a needle plate (50) which closes the column (2) upwards and through which it projects through a slot (50a).
  • the stitch plate (59) is provided with a stitch slot (50b) (see also Fig. 6) for the passage of the needle (13).
  • the carrier (30) is firmly clamped to it by a screw (51) screwed into its upper part, which projects through a slot (52) in the column (2).
  • the lateral position of the pusher wheel (47) can be aligned with the slot (50a) in the throat plate (50).
  • a vertical shaft (53) is loosely mounted in the head (5) of the sewing machine.
  • a clamping piece (54) is screwed onto the shaft (53). This has a radial bore in which a pin (55) is pressed.
  • a coupling piece (56) is also loosely mounted on the shaft 53.
  • a web (57) projecting laterally from it protrudes through a slot in the head (5) and secures the coupling piece (56) against rotation.
  • the coupling piece (56) is designed as a ring cutout in its lower region and thus encompasses the clamping piece (54).
  • the ring cutout has a recess (59) into which the pin (55) projects and which at one end merges into a latching groove (60), while at the other end it ends with a wall (61).
  • a compression spring (62) which is supported against an adjusting ring (63) attached to the shaft (53), presses the coupling piece (56) and thus the upper wall of its ring cutout slightly downwards against the pin (55).
  • a lever arm (65) of an angle lever (66) mounted in the head (5) protrudes below the web (57) and is connected via a link (67) to a lever linkage (not shown) which can be actuated by the operator.
  • a cam (68) is fastened under the lever arm (65) on a shaft (69) mounted in the head (5).
  • the shaft (69) (FIG. 2) carries a hand lever (70) on its outwardly projecting end.
  • a block (71) is attached, which is equipped with a groove guide (72).
  • An angular flap (73) with an elongated hole is screwed into this, which is firmly connected to a caster base (74).
  • This has a pipe socket (75) (see also Fig. 3), which merges into a downwardly projecting end piece (76).
  • a bore is provided in this for the attachment of an axle stub (78) of a roller bearing (80) with ball bearings.
  • the roller foot (80) has a race (81) with which a ring gear (82) of a spiroid gear (83) is fixedly connected, the pinion (84) of which is off-center in engagement with the ring gear (82).
  • a tubular support (85) is received in the pipe socket (75) and its position is clamped by screws (86) screwed into the pipe socket (75).
  • the carrier (85) consists of a tube (87), a hollow cylinder (88) which adjoins at the top and an annular connecting flange (89).
  • a shaft (90) is mounted in the tube (87), which carries the pinion (84) at its lower end and is fixedly connected to an annular shoulder (91) which bears against the lower end of the tube (87).
  • the shaft (90) is gripped in the area of its upper end by the inner ring of a ball bearing (93) pressed into the hollow cylinder (88).
  • the upper end of the shaft (90) is rigidly coupled by a coupling (94) to a drive shaft (95) of a stepper motor (96), the housing of which is screwed onto the end flange (89).
  • a pulse disc (100) On the main shaft (6) (Fig. 1) of the sewing machine, a pulse disc (100) is attached, which has two pulse paths, each of which works with a pulse generator (101 or 102).
  • One pulse path has a plurality of pulse markings (103) (FIG. 5) distributed uniformly over its circumference, while the other pulse path has only two pulse markings (104), one of which has the pulse generator (101) when the needle (13) emerges. out of the workpiece and the other happens when the needle (13) enters the workpiece.
  • the pulse generator (101) is connected to a control unit (105).
  • a switchover arrangement (106), control lines (107a, 108a and 109a) AND gates (107, 108 and 109) and counters (111, 112 and 113) are connected to this via a control line (106a) .
  • a keypad (114), a display unit (115) via a bus line (115a) and a data memory (116) via a bus line (116a) are connected to the control unit (105) via a bus line (114a).
  • the outputs of the counters are connected to inputs of power stages (117, 118 and 119) for the associated stepper motors (23, 42 and 96).
  • the outputs of the counters (111, 112 and 113) are connected to the control unit (105) via lines (111a, 112a and 113a). Lines (117a, 118a and 119a) lead from the control unit (105) to the power stages (117, 118 and 119). Three switches (120, 121 and 122) are also connected to the control unit (105), of which the switch (120) is used to actuate a reverse sewing process, while the two switches (121 and 122) are used to slowly drive the stepper motors (42 and 96 ) in the forward or backward direction when the sewing machine is at a standstill preferably in the needle up position.
  • an oscillator (123) is connected to the two power stages (118 and 119) via a divider (124) and a switch (125).
  • the switch (125) is connected to the control unit (105) via a control line (125a).
  • the oscillator (123) is also connected to the input (E1) of the switching arrangement (106), the input (E2) of which is connected to the pulse generator (102).
  • the output of the switching arrangement (106) leads to the inputs (E1) of the three AND gates (107, 108 and 109), the outputs of which are each connected to the associated counter (111, 112 and 113), which are designed as a down counter and which can be individually preset by the control unit (105) via the collecting line (110).
  • the keypad (114) With the keypad (114) the number of steps of the stepper motors (23, 42 and 96) per sewing stitch and thus the feed length of the individual transport elements - needle (13), pusher wheel (47) and roller foot (80) - can be selected between the respective stitch formation, different feed amounts of the sliding wheel (47) relative to the roller foot (80) can also be set.
  • the measure of the preselected stitch length is shown in the display unit (115).
  • a switch (126) is connected to the control unit (105) and is used to switch from the "moving needle” mode to the "fixed needle” mode and vice versa. Furthermore, a counter (127) can be provided, which is connected to the control unit (105) via a bus line (127a) and a line (127b) and a line (127c) both to the pulse generator (101) and to the control unit (105). connected is.
  • Fig. 6 shows schematically the distances traveled by the needle (13) during stitch formation as well as the movement of the sewing material caused by the pusher wheel (46) and the roller foot (80) for a predetermined stitch length (S).
  • the needle (13) sticks into the sewing material at a puncture point (P1), moves with it over its center line (M) according to the distances (n1 and n2) to the puncturing point P2 from the sewing material.
  • the pusher wheel (46) and roller foot (80) also move the sewing material by the same amount (distances r1 and r2).
  • the needle (13) After the needle (13) has left the sewing material at point (P2), it moves outside the sewing material by the distances (n3 and n4) back to its insertion point (P1).
  • the sliding wheel (46) and roller foot (80) move the sewing material by the two distances (r3 and r4).
  • the facility works as follows: The operator uses the keypad (114) to set the desired feed amounts of the needle (13), the pusher wheel (47) and the roller presser (80), the corresponding digital values being taken from the data memory (116) via the control unit (105) and thus the counter (111, 112 and 113) can be preset. At the same time, values corresponding to the feed amounts are displayed in the display unit (115).
  • the sewing motor (8) drives the main shaft (6) via the V-belt (7), which moves the needle bar (14) up and down via the drive connection - crank (11) and handlebar (12).
  • the main shaft (6) also drives the gripper (not shown) via the toothed belt (9) and the gripper drive shaft (10).
  • the drive for feeding the workpiece is triggered via the pulse generator (101) whenever the needle (13) penetrates the workpiece and when it leaves it.
  • the pulse generator (101) emits a pulse to the control unit (105).
  • step impulses acting on the stepper motors (23, 42 and 96) drive the rocker arm (17), the pusher wheel (47) and the roller foot (80) for the joint transport effect on the workpiece.
  • the stepper motor (42) rotates the pusher wheel (47) via the standing shaft (38) which is firmly coupled to its output shaft (43) and the angular gear (45), while the stepper motor (80) simultaneously rotates via the shaft which is firmly coupled to its output shaft (95) Shaft (90) and the angular gear (83) drives the roller foot (80).
  • the stepper motor (23) simultaneously rotates the eccentric (21) gradually in one direction via its output shaft (22), its eccentricity transmitting deflection movements via the eccentric rod (20) and the lever arm (18) to the rocker (17), which thereby swinging out corresponding angular amounts. This takes place when the needle (13) is inserted in the workpiece in synchronism with the feed of the pusher wheel (47) and the roller foot (80) and when the needle (13) is cut out by driving the eccentric (21) in the opposite direction.
  • the needle bar (14) performs a sinusoidal oscillating movement in the feed direction. During its pierced phase in the workpiece it swings in the feed direction and during the pierced phase it swings in the opposite direction.
  • the control of the stepper motor (23) for swinging out the needle bar (14) is therefore designed so that it gives the stepper motor (23) during one revolution of the main shaft (6), i.e. with each feed during stitch formation, two sinusoidal partial step sequences, one of which one drives the stepper motor (23) in the feed direction and the other drives it in the opposite direction.
  • the stepper motors (42 and 96) for the sliding wheel (47) and the caster (80) are advantageously also not driven as a constant step sequence, but in two sinusoidal partial step sequences.
  • the input (E2) of the respective AND gate (107 , 108 or 109) are switched from the control unit (105) to L potential via the control line (107a, 108a or 109a), so that the corresponding AND gate (107, 108 or 109) allows the clock pulses from the pulse generator ( 102) is prevented.
  • the changeover from the "moving needle” operating mode to the "fixed needle” operating mode takes place by actuating the switch (126) in its closed state.
  • the control unit (105) controls the switching process when the next pulse from the pulse generator (101) emerges when the needle (13) emerges (see also FIGS. 6 and 7) at the cut-out point (P2). This then runs in the cut phase the needle (13).
  • the needle (13) is moved back into its central position M against the feed direction (V) (distance n3). Since the needle (13) normally only executes half the stitch length (S) during its pierced phase (distances n1 and n2), this movement is a quarter of the stitch length (S).
  • Slider wheel (47) and roller foot (80) have to move the sewing material in the first part of their feed (distance r1) to the center line M and in the second part of their feed (distance r2) they only need 1/4 of the stitch length S of from the center line M have now carried out the remaining amount, namely three quarters of the stitch length (S) (distances r3, r4 and r1) in the cut-out phase of the needle (13) to complete the started stitch.
  • the corresponding data values for the movement of the needle (13), the pusher wheel (47) and the roller foot (80) are calculated from the entered stitch length (S) by the control unit (105) and when the stitch is carried out in the counter (111 , 112 and 113). In the subsequent stitches with the needle (13) stationary, no data values are entered into the counter (111).
  • the counters (112 and 113) are likewise not given any data values during the pierced phase of the needle (13), while the total data values required for executing the set stitch length (S) are respectively entered during the pierced phase of the needle (13). These then each correspond to twice the amount of the data values entered on the respective counter (112 or 113) during needle feed during half a stitch execution.
  • the pusher wheel (47) and the roller foot (80) are at hand inserted needle (13) silently, while with the needle (13) removed the entire feed amount to be carried out for one stitch length.
  • the changeover switch (126) is switched back to its open position.
  • the control unit (105) controls the needle (13) from its central position M by a quarter of the stitch length (S) Sewing direction back to the puncture point (P1).
  • the feed wheel (47) and the roller presser (80) transport the sewing material by three quarters of the stitch length (S) in the sewing direction, namely by the distances (r2, r3 and r4), so that the needle (13) is exactly at the next stitch at the next stitch Stitch length (S) from the previous stitch at the puncture point (P1).
  • the control unit (105) subsequently controls the control sequence of the movement of the needle (13), pusher wheel (47) and roller foot (described above in the "moving needle” operating mode when the impulse of the pulse generator (101) occurs when entering the material to be sewn). 80).
  • the changeover of the operating modes can also be controlled by the presettable counter (127), for example at the start of a sewing process.
  • the counter (127) can be preset via the keyboard (114) to a certain amount, which corresponds to the number of stitches during which the needle bar guide (17) is to be stopped and during which the pusher wheel (47) and the roller presser ( 80) should take over the feeding of the sewing material alone. This The amount can then be transferred to the counter (127) by the control unit (105) via the collecting line (127a) before each sewing operation.
  • the counter (127) is then counted down by "1" when the needle (13) emerges from the sewing material via the pulse emitted by the pulse generator (101). As soon as the counter (127) is at "O”, the system switches to the "moving needle” operating mode, which then proceeds in the manner described above.
  • the switch (120) is actuated, whereby the control unit (105) at the start of a new pulse from the pulse generator (101) via the control lines (117a, 118a and 119a) at the power stages (117, 118 and 119) reverses the direction of movement of the stepper motors (23, 42 and 96) so that they drive the pusher wheel (47), the roller presser (80) and the needle bar (14) in the opposite direction as long as the actuation of the switch ( 120) continues.
  • the sequence of steps of the stepper motors (23, 42 and 96) is carried out by calling up the corresponding values set in the keypad (114) from the data memory (116) in the manner described above.
  • the control unit (105) switches the switching arrangement (106) to the input (E1), so that the pulses emitted by the oscillator (123) reach the inputs (E1 ) of the AND gates (107, 108 and 109).
  • clock pulses are thus given by the oscillator (123) to the inputs (E1) of the AND gates (107, 108 and 109) instead of the clock pulses by the pulse generator (102).
  • the control unit (105) switches the AND elements (107, 108 and 109) off via the control lines (107a, 108a and 109a).

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

Abstract

Dans les machines à coudre où l'entraînement de l'avance de l'aiguille et du train baladeur se fait au moyen de moteurs pas-à-pas, l'avance de l'aiguille ne peut pas être arrêtée. Selon la présente invention, par contre, l'avance de l'aiguille (n1, n2, n3, n4) est arrêtée au moyen d'un agencement commutateur qui arrête l'oscillation de l'aiguille (13) dans le sens d'avancement (point M), qui supprime la longueur d'avance (r2) du train baladeur pendant la phase de pîquage (n1) de l'aiguille et qui ajoute à la longueur d'avance (r3, r4, r1) du train baladeur pendant la phase de retrait (n3) de l'aiguille la longueur supprimée.

Claims (1)

  1. Machine à coudre avec une barre d'aiguille, montée dans un bras oscillant, qui est reliée à un moteur pas à pas pour faire osciller l'aiguille dans le sens de l'entraînement comportant une roue d'entraînement inférieure et/ou une roue d'entraînement supérieure, entraînées chacune par un autre moteur pas à pas, de façon synchronisée avec le mouvement d'avance de l'aiguille, comportant une mémoire dans laquelle sont contenues des informations à sélectionner pour influencer le moteur pas à pas concerné, comportant une unité de commande, montée entre la mémoire et les moteurs pas à pas, pour sélectionner et convertir les informations en impulsions destinées aux moteurs pas à pas et comportant un générateur d'impulsions, fonctionnant de manière synchrone avec l'arbre principal de la machine à coudre, pour déclencher la transmission des impulsions aux moteurs pas à pas, caractérisée en ce que l'unité de commande (105) contient une commande reliée à un commutateur (126), laquelle
    a) met à l'arrêt le moteur pas à pas (23) du mouvement oscillant s'effectuant dans le sens de l'avance de la barre à aiguille (14), dans la position centrale de celle-ci,
    b) supprime les mouvements d'entraînement tombant dans la phase enfoncée de l'aiguille (13), de la roue d'avance inférieure (47) et/ou de la roue d'entraînement supérieure (80) et
    c) augmente, de la longueur du mouvement d'entraînement annulé la distance d'entraînement tombant dans la phase ressortie de l'aiguille (13), commandée par le moteur pas à pas (42, 96) entraînant la roue d'entraînement inférieure (47) et/ou la roue d'entraînement supérieure (80).
EP89904043A 1988-05-05 1989-04-01 Machine a coudre avec dispositif de transport de l'aiguille Expired - Lifetime EP0413699B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3815323 1988-05-05
DE3815323 1988-05-05
DE3908952 1989-03-18
DE3908952A DE3908952A1 (de) 1988-05-05 1989-03-18 Naehmaschine mit nadeltransport

Publications (2)

Publication Number Publication Date
EP0413699A1 EP0413699A1 (fr) 1991-02-27
EP0413699B1 true EP0413699B1 (fr) 1992-12-09

Family

ID=25867797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89904043A Expired - Lifetime EP0413699B1 (fr) 1988-05-05 1989-04-01 Machine a coudre avec dispositif de transport de l'aiguille

Country Status (6)

Country Link
EP (1) EP0413699B1 (fr)
JP (1) JP2905528B2 (fr)
KR (1) KR900700677A (fr)
DE (1) DE3908952A1 (fr)
ES (1) ES2014078A6 (fr)
WO (1) WO1989010993A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019170707A (ja) * 2018-03-28 2019-10-10 ペガサスミシン製造株式会社 ミシンの針棒駆動機構

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3516713C1 (de) * 1985-05-09 1986-04-24 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Naehmaschine mit einer in einer Schwinge gelagerten Nadelstange
DE3516715C2 (de) * 1985-05-09 1987-04-30 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Nähmaschine mit einer Vorschubeinrichtung

Also Published As

Publication number Publication date
JPH04504958A (ja) 1992-09-03
JP2905528B2 (ja) 1999-06-14
WO1989010993A1 (fr) 1989-11-16
DE3908952A1 (de) 1989-11-30
EP0413699A1 (fr) 1991-02-27
KR900700677A (ko) 1990-08-16
DE3908952C2 (fr) 1990-05-03
ES2014078A6 (es) 1990-06-16

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