EP0366630A1 - Dispositif pour machine à coudre - Google Patents

Dispositif pour machine à coudre Download PDF

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Publication number
EP0366630A1
EP0366630A1 EP89850270A EP89850270A EP0366630A1 EP 0366630 A1 EP0366630 A1 EP 0366630A1 EP 89850270 A EP89850270 A EP 89850270A EP 89850270 A EP89850270 A EP 89850270A EP 0366630 A1 EP0366630 A1 EP 0366630A1
Authority
EP
European Patent Office
Prior art keywords
wheel
arrangement
presser foot
measuring
sewing machine
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
EP89850270A
Other languages
German (de)
English (en)
Other versions
EP0366630B1 (fr
Inventor
Bertil Ake Harry Friman
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.)
Husqvarna AB
Original Assignee
Husqvarna AB
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 Husqvarna AB filed Critical Husqvarna AB
Publication of EP0366630A1 publication Critical patent/EP0366630A1/fr
Application granted granted Critical
Publication of EP0366630B1 publication Critical patent/EP0366630B1/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
    • D05B27/22—Work-feeding means with means for setting length of stitch
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/24—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing formed by general-purpose sewing machines modified by attachments, e.g. by detachable devices

Definitions

  • the present invention relates to an arrangement for measuring a length in the sewing place of a sewing machine, for measuring the feeding of the machine in respect of a treated working material as well as for guiding the operations of the machine in connection with the feeding when making a fancy seam.
  • the invention relates to an improvement of hitherto known converters of a linear movement of a determined size to a thereof determined angle which is converted in electronic circuits from an analogous measuring quantity into a digital number.
  • the measured magnitude can be used in a control system including a processing of data for making operations on a working material.
  • the arrangement is used in an electro­nic sewing machine for controlling the stitch forming components in forming a special fancy seam.
  • the measuring arrangement shall be sensitive for very small displace­ments of the working material.
  • the arrangement separa­tes and assigns the right sign to the displacements in the forward and the back­ward directions respectively. Under these cirumstances a suitable solution of the problem of measuring and converting measured magnitudes is, according to the invention, expressed in an arrangement which is stated in the characteris­tics of claim 1.
  • the presser foot is detachably located on a bar 10 and is in the usual way displaceable between an upper resting position and a lower working position.
  • the attachment in the lower end of the bar is a snap-on attachment 11 from which the foot can be easily detached and exchanged for another one.
  • the foot shown is a buttonhole foot 12 combined with a measuring arrangement 13.
  • the sewing machine is assumed to be an electronic computerized sewing machine with a program for sewing of buttonholes.
  • Fig. 1 and 2 The design of the arrangement is shown in Fig. 1 and 2.
  • the body is pro­vided with two halves 14, 15 united by means of shafts 16, 17.
  • the one, 16, also serves as a shaft for a wheel 18, with a toothed periphery which projects into an opening 20 between the two halves 14, 15.
  • On the inside of one of them, 14, a circular disk 21 is supporting a resistance surface 22 concentrical with the wheel, and constituting a part of a potentiometer.
  • a sliding contact 23 of it is positioned on the wheel so that different settings are effected on the potentiometer when the wheel rotates. From the resistance 22 and the con­tact 23 electric wires come into a cable 24 which ends with a plug 25 fitting into a corresponding socket on the sewing machine.
  • Fig. 2 shows that the presser foot and the measuring arrangement are united by means of a shaft 17 being at one end attached to the presser foot and constituting a pivot for the measuring arrangement in a vertical plane.
  • a screw spring 26 is concentrically placed on the shaft 17 between the measuring arrangement and the presser foot and has attachment points 27, 28 on the arran­gement as well as on the foot.
  • the purpose of the spring is to press the wheel in the direction towards the stitch plate of the machine i.e. towards a working material guided through the sewing place while the wheel is easily rotating on its shaft 16 and follows the movement of the material forwards as well as backwards.
  • a couple of pins 29, 30 are located on the body half next to the presser foot and hit it from below as well as from above. Thus they constitute a stop for the movement of the arrangement in the vertical plane.
  • a further spring 31 is provided in this half 15 near to the wheel 18 which is influenced by this spring to rotate into a starting position so that the sliding contact 23 goes to an end position on the resistance 22.
  • the function of the measuring arrangement according to the foregoing is hereinafter described together with a system for automatic sewing of button­holes with an electronic sewing machine.
  • the system is illustrated as a block diagram in Fig. 4 which also includes an arrangement 32 for measuring a button of a size to fit the buttonhole.
  • the arrangement 32 includes a potentiometer 33 which supplies a voltage corresponding to the size of the button on a wire to an analogue/digital converter 34 in which the voltage is encoded and applied to a comparator 35.
  • the above mentioned measuring arrangement provides a voltage which successively increases the longer the wheel 18 rotates. This voltage is gradually encoded in a second analogue/digital converter 36 and set to zero when the wheel 18 is reaching its initial position.
  • the code from the converter is first applied to the comparator 35 and then on a wire 37 to an AND-­circuit.
  • a start contact 38 supplies a start signal to a counter 39 when a button­hole is to be sewn and adjusts it to zero.
  • the buttonhole sewing then starts with a space A in the reverse direction (Fig. 5). This is indicated by a signal on a wire 40 from the counter.
  • the wheel 18 rotates in contact with the fabric and the converter 36 provides an increasing digital code to the comparator.
  • this code coincides with the code recorded in the comparator from the converter 34 a puls is released from the comparator which together with a signal on the wire 40 in an AND-circuit 41 to an OR-gate 42 releases a counting pulse to the counter 39.
  • the output signal of the latter then changes from the wire 40 to a second output 43 which means zero-rated feeding and bar stiches B.
  • a special control circuit is provided with an armshaft detector 44, a stitch counter 45, a second comparator 46 and a memory 47 on which a pre­determined binary number is recorded and transferred to the comparator 46.
  • the stitch counter outputs the same number (number of stitches) as the recorded number the comparator applies a signal to a wire 48 which together with the signal on the wire 43 in an AND-circuit 49 via the OR-gate 42 releases a counting pulse to the counter 39.
  • the output signal of the counter 39 changes from the wire 43 to a third output 50. This controls forward feeding of the fabric and sewing the space stitches C. During the forward feeding the wheel 18 rotates in the opposite direction to that one mentioned before and the converter 36 supplies a decreasing digital code to the comparator 35.
  • a system according to Fig. 4 can be included into an ordinary micropro­cessor used in electronic sewing machines. Such a microprocessor is then pro­vided with analogue inputs for the measuring quantities arising on the poten­tiometers 33 and 22, 23.
  • the part of the system related to automatic buttonholes is separately recorded in the computer with the moments in principle stated here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP19890850270 1988-10-21 1989-08-25 Dispositif pour machine à coudre Expired - Lifetime EP0366630B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8803779A SE8803779L (sv) 1988-10-21 1988-10-21 Anordning vid symaskin
SE8803779 1988-10-21

Publications (2)

Publication Number Publication Date
EP0366630A1 true EP0366630A1 (fr) 1990-05-02
EP0366630B1 EP0366630B1 (fr) 1994-02-02

Family

ID=20373707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890850270 Expired - Lifetime EP0366630B1 (fr) 1988-10-21 1989-08-25 Dispositif pour machine à coudre

Country Status (3)

Country Link
EP (1) EP0366630B1 (fr)
DE (1) DE68912877T2 (fr)
SE (1) SE8803779L (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027320A1 (de) * 1979-07-18 1981-02-05 Janome Sewing Machine Co Ltd Naehmaschine
FR2521605A1 (fr) * 1982-02-18 1983-08-19 Prouvost Sa Dispositif de detection de la longueur d'une couture, machine a coudre munie d'un tel dispositif, et procede de couture partiellement automatise

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027320A1 (de) * 1979-07-18 1981-02-05 Janome Sewing Machine Co Ltd Naehmaschine
FR2521605A1 (fr) * 1982-02-18 1983-08-19 Prouvost Sa Dispositif de detection de la longueur d'une couture, machine a coudre munie d'un tel dispositif, et procede de couture partiellement automatise

Also Published As

Publication number Publication date
SE8803779D0 (sv) 1988-10-21
EP0366630B1 (fr) 1994-02-02
DE68912877D1 (de) 1994-03-17
SE8803779L (sv) 1990-04-22
DE68912877T2 (de) 1994-07-14

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