EP0020184A1 - Nähmaschinen mit automatischer Werkstückführung - Google Patents

Nähmaschinen mit automatischer Werkstückführung Download PDF

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Publication number
EP0020184A1
EP0020184A1 EP80400271A EP80400271A EP0020184A1 EP 0020184 A1 EP0020184 A1 EP 0020184A1 EP 80400271 A EP80400271 A EP 80400271A EP 80400271 A EP80400271 A EP 80400271A EP 0020184 A1 EP0020184 A1 EP 0020184A1
Authority
EP
European Patent Office
Prior art keywords
length
stitch
presser
speed
adjusting
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
EP80400271A
Other languages
English (en)
French (fr)
Other versions
EP0020184B1 (de
Inventor
Gérard Biotteau
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
Original Assignee
Biotteau Gerard
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 Biotteau Gerard filed Critical Biotteau Gerard
Priority to AT80400271T priority Critical patent/ATE2854T1/de
Publication of EP0020184A1 publication Critical patent/EP0020184A1/de
Application granted granted Critical
Publication of EP0020184B1 publication Critical patent/EP0020184B1/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/22—Work-feeding means with means for setting length of stitch
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/10—Edge guides
    • D05B35/102—Edge guide control systems with edge sensors
    • 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
    • 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
    • D05D2207/02—Pneumatic or hydraulic devices

Definitions

  • the present invention relates to sewing machines comprising an automatic workpiece guiding device.
  • this guide device is to automatically rotate the part in an anti-clockwise direction when the edge of the part to be “joined” or "bordered” has a convex curvature.
  • connect is meant the assembly by a border stitching of two superimposed pieces and by "border” the application of a loop folded astride the edge of the piece.
  • Guidance is, in general, in the device described in this French patent and in its Certificate of Addition as well as in the devices proposed, for example, in American patents? 2,971,483, 3,598,070 and 3,752,097, provided by a presser which comes to bear on the workpiece at the theoretical center of rotation while the workpiece continues to be driven by the claws and the needle or other following drive devices the type of machine.
  • the pressing of the presser is controlled by a detector either mechanical or with photocell, which detects the displacement apparent, towards the presser, from the edge of the workpiece.
  • the object of the present invention is to remedy this defect in a simple manner.
  • the guide device mounted in a known manner on a sewing machine comprising a device for adjusting the stitch length and a device for adjusting the operating speed of the machine, is characterized by a device for increase in the length of the stitch and by a device for reducing the speed of the workpiece drive both controlled by the actuation of the guide presser.
  • the length of the needle pitch and positive drive devices such as the prongs is increased, this lengthening having to correspond substantially to the amplitude of the "backtracking" of the material constituting the part.
  • the combination of these two factors "training on a greater pitch” and “backward retracing” should theoretically lead to a practical length of the point in the curved parts of the bite substantially uniform and equal to that of the point in the straight parts.
  • the "backtrack” varies according to the nature of the material on which the stitching is carried out and also varies according to the nature of the thread used and the length of the stitch.
  • the control device for varying the length of the stitch acting by all or nothing because it is controlled by whether the guide presser is pressed or not it is preferable to provide in the transmission an adjustment of the ratio between the stroke of the control member and the stroke of the controlled stitch length adjusting member or to provide a member such as a stop limiting the stroke of the stitch length adjusting member to be able to take these particular factors into account. This adjustment can be made by trial and error during the general adjustment for a series of parts.
  • the presser control device also controls a reduction in the speed of the drive devices of the part such as the needle and the claws, that is to say in practice of the general drive motor of the machine.
  • control members of the same type as that ensuring the pressing of the presser can therefore be constituted by a pneumatic or hydraulic cylinder in combination with an electromechanical valve or an electromagnet with or without mechanical transmission.
  • Figures 1 to 4 show a stitching 1 made on the corner of a shoe tongue 2 in sheepskin lined with textile.
  • the stitching is carried out using a machine equipped with a guiding device such as that described in the request for French Certificate of Addition N ° 76 11707, the length of the stitch being adjusted to 3 mm.
  • the length of the stitch is regular and the stitching follows a correct line.
  • the stitching is carried out on the same machine as the stitching in FIG. 1, but the latter is provided with a device for modifying the length of the stitch.
  • the length of the stitch is increased from 3 mm to 4.5 mm.
  • a zone c 'in which the point is elongated followed by a zone d' in which the line again becomes irregular and offset towards the outside the point being greatly shortened .
  • FIG. 3 The injection of FIG. 3 is carried out on the same machine as that of FIG. 1, said machine having been provided with a speed adjustment device which makes it possible to reduce the speed of the machine from 3000 points / minute to 900 points / minute when pressing the presser at 3.
  • the line obtained in c "and d" is regular but the length of the point decreases progressively from the entry towards the exit of the zone, the average length falling to a millimeter which does not give a regular puncture.
  • the stitching is carried out on the same machine as that of FIG. 1.
  • the machine is provided with a device allowing both the modification of the length of the stitch and the adjustment of the speed. in accordance with the present invention.
  • the length of the stitch was increased from 3 mm to 4.5 mm and the machine speed which was 3000 points / minute was reduced during the pressing of the presser to 900 points / minute.
  • the curve of the stitching which had a radius of curvature of 6 mm does not present any irregularity and the length of the point remained constant.
  • the reference 10 designates the input of the signal from the detector which controls the descent of the rotary feeler 11
  • 12 designates the input of the signal from the detector which controls the raising of the feeler 11.
  • the reference 13 designates the needle, the reference 14 the crowbar, the reference 15 the feed dogs, the reference 16 the needle plate, the reference 17 the photoelectric cell constituting the rotation control detector, the reference 18, the photoelectric cell starting and stopping of the machine engine, reference 19 the engine, and the ref 20 the electronic engine speed control unit.
  • FIG. 5 represents the overall diagram of the modification according to the invention as regards the adjustment of the length of the stitch.
  • the reference 21 designates the lever of the cursor of the machine which controls the length of the stitch, this lever moving towards the + to increase the length of the stitch and towards the - to shorten it.
  • the normal length of the stitch is adjusted by a micrometric stop 22 and the maximum length by the position of the knurled nut 23 on the lever 21, the lever being biased towards the "long” points by a spring 24 and towards the “short” points "by a jack 25 supplied by a valve 26 controlled by a switch 27 from the input 12 of the presser raising control 11.
  • the device consists essentially of two adjustable potentiometers 28 and 29 inserted in the power supply of the electronic member 20 for controlling the speed of the motor 19.
  • the potentiometer 28 corresponds to slow speed and it is switched on by a relay 30 when the presser 11 is pressed by an entry at 10.
  • the manual contactor 31 enables the device to be switched on or off.
  • a second or more sets of speed adjustment 28 ′, 29 ′, 30 ′, 31 ′ may be provided when the puncture layout includes areas where the speed maximum must be reduced to achieve a pitting curve with a large radius of curvature separating zones with a small radius of curvature, the selection being carried out manually with the contactors 31, 31 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP80400271A 1979-05-11 1980-02-27 Nähmaschinen mit automatischer Werkstückführung Expired EP0020184B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80400271T ATE2854T1 (de) 1979-05-11 1980-02-27 Naehmaschinen mit automatischer werkstueckfuehrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7912011A FR2456156B1 (fr) 1979-05-11 1979-05-11 Perfectionnement aux machines a coudre comportant un dispositif de guidage automatique de la piece
FR7912011 1979-05-11

Publications (2)

Publication Number Publication Date
EP0020184A1 true EP0020184A1 (de) 1980-12-10
EP0020184B1 EP0020184B1 (de) 1983-03-23

Family

ID=9225356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400271A Expired EP0020184B1 (de) 1979-05-11 1980-02-27 Nähmaschinen mit automatischer Werkstückführung

Country Status (8)

Country Link
US (1) US4312286A (de)
EP (1) EP0020184B1 (de)
AT (1) ATE2854T1 (de)
BR (1) BR8002825A (de)
DE (1) DE3062392D1 (de)
ES (1) ES489941A1 (de)
FR (1) FR2456156B1 (de)
PT (1) PT71034A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194182A1 (de) * 1985-02-21 1986-09-10 Centre Technique Industriel dit: INSTITUT TEXTILE DE FRANCE Werkstückkantenführungsvorrichtung für Nähmaschine
FR2585378A2 (fr) * 1985-07-26 1987-01-30 Inst Textile De France Installation perfectionnee de traitement lineaire d'un bord d'une piece souple telle qu'une piece textile
EP0237510A3 (en) * 1986-03-11 1988-04-06 Husqvarna Aktiebolag Control arrangement of feeding in a sewing machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3048198C2 (de) 1980-12-20 1982-12-23 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Nähmaschine mit mindestens einem Stoffschieber und einer Führungsvorrichtung zum selbsttätigen Herstellen kurvenförmiger, randparalleler Nähte
DE3314717C1 (de) * 1983-04-22 1984-02-09 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Naehmaschine mit mindestens einem Stoffschieber und einer Fuehrungsvorrichtung zum selbsttaetigen Herstellen einer kurvenfoermigen,randparallelen Naht
GB8316899D0 (en) * 1983-06-22 1983-07-27 British United Shoe Machinery Folding machines
US4589363A (en) * 1984-10-06 1986-05-20 Pfaff Industriemaschinen Gmbh Sewing machine for automatically making edge-parallel seams

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609373A (en) * 1970-05-18 1971-09-28 Singer Co Photoelectric sensors and circuitry for edge-guiding systems for sewing machines
US3742879A (en) * 1970-12-03 1973-07-03 Usm Corp Automatic work guidance mechanism
FR2230778A1 (de) * 1973-05-22 1974-12-20 Rimoldi C Spa Virginio
DE2608859A1 (de) * 1976-03-04 1977-09-08 Duerkoppwerke Verstelleinrichtung zum beeinflussen des stoffvorschubes bei der ausfuehrung von naeharbeiten auf einer naehmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE538934A (de) * 1954-06-15
US3139051A (en) * 1962-08-21 1964-06-30 Wayne G Story Sewing machine universal feed arrangement
FR2348993A2 (fr) * 1976-04-21 1977-11-18 Eram Chaussures Dispositif de guidage automatique de la piece sur une machine a coudre
US4100864A (en) * 1977-01-17 1978-07-18 Usm Corporation Automatic work guidance mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609373A (en) * 1970-05-18 1971-09-28 Singer Co Photoelectric sensors and circuitry for edge-guiding systems for sewing machines
US3742879A (en) * 1970-12-03 1973-07-03 Usm Corp Automatic work guidance mechanism
FR2230778A1 (de) * 1973-05-22 1974-12-20 Rimoldi C Spa Virginio
DE2608859A1 (de) * 1976-03-04 1977-09-08 Duerkoppwerke Verstelleinrichtung zum beeinflussen des stoffvorschubes bei der ausfuehrung von naeharbeiten auf einer naehmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194182A1 (de) * 1985-02-21 1986-09-10 Centre Technique Industriel dit: INSTITUT TEXTILE DE FRANCE Werkstückkantenführungsvorrichtung für Nähmaschine
FR2585378A2 (fr) * 1985-07-26 1987-01-30 Inst Textile De France Installation perfectionnee de traitement lineaire d'un bord d'une piece souple telle qu'une piece textile
EP0237510A3 (en) * 1986-03-11 1988-04-06 Husqvarna Aktiebolag Control arrangement of feeding in a sewing machine

Also Published As

Publication number Publication date
BR8002825A (pt) 1980-12-16
PT71034A (fr) 1980-04-01
FR2456156A1 (fr) 1980-12-05
US4312286A (en) 1982-01-26
DE3062392D1 (en) 1983-04-28
ATE2854T1 (de) 1983-04-15
FR2456156B1 (fr) 1985-05-31
EP0020184B1 (de) 1983-03-23
ES489941A1 (es) 1980-10-01

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