EP0373105A1 - Vorrichtung zum Messen des Durchgangs einer vorbestimmten Länge eines Werkstücks am Nähpunkt einer Nähmaschine - Google Patents

Vorrichtung zum Messen des Durchgangs einer vorbestimmten Länge eines Werkstücks am Nähpunkt einer Nähmaschine Download PDF

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Publication number
EP0373105A1
EP0373105A1 EP89810849A EP89810849A EP0373105A1 EP 0373105 A1 EP0373105 A1 EP 0373105A1 EP 89810849 A EP89810849 A EP 89810849A EP 89810849 A EP89810849 A EP 89810849A EP 0373105 A1 EP0373105 A1 EP 0373105A1
Authority
EP
European Patent Office
Prior art keywords
pins
fabric
hand
mobile
closure member
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
EP89810849A
Other languages
English (en)
French (fr)
Other versions
EP0373105B1 (de
Inventor
Antonio Jimenez
Gino Walter Michelizza
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.)
Mefina SA
Original Assignee
Mefina SA
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 Mefina SA filed Critical Mefina SA
Publication of EP0373105A1 publication Critical patent/EP0373105A1/de
Application granted granted Critical
Publication of EP0373105B1 publication Critical patent/EP0373105B1/de
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 a device for measuring the passage of a determined length of a fabric in line with the needle of a sewing machine comprising, on the one hand, a pair of marks each constituting a contact element electric, an adjusting member for varying the spacing between these marks, these being intended to fix respectively the origin of the length to be measured and the end thereof, and, on the other hand, a closing member of contacts arranged between these pins, a mobile secured to one of the elements, pair of pins or contact closure member, means for bringing this mobile into engagement with the fabric to be sewn and causing it to be driven as a function of the advance of this fabric, and a return member constantly tending to bring this mobile in a position in which the mark fixing the origin of the length to be measured and said contact closure member are applied one against the other.
  • the electrical signals indicating to the control circuit respectively the origin and the end of the passage of determined length of the fabric to the right of the needle of the sewing machine can be generated by mechanical, magnetic, electro-optical or electric means.
  • the advantage of electrical means is that they do not have to use an intermediary and act directly on the electrical control circuit of the machine, which constitutes a guarantee of precision and operational safety that cannot be found with the other means mentioned above.
  • the bar of the presser foot is electrically conductive and is connected on the one hand to a terminal the machine control circuit and, on the other hand, a first contact member, integral with the presser foot.
  • a second organ of contact, isolated from the first and also integral with the presser foot, is connected to the other pole of this control circuit by a wire passing inside the tubular rod of this foot.
  • These two contact members are each provided with a wiper, which is in contact with an insulating track, constituted by two slides, the first of which is slidably mounted on the presser foot of the fabric press, and is intended to be driven by the fabric advance.
  • This first slide carries a conductor arranged transversely to the insulating track, a second similar conductor being carried by the second slide which is adjustable by sliding on the first, to determine the length of the stroke of the fabric.
  • the conductive pins integral with the respective slides are, from the electrical point of view, passive elements since they are not directly intended to be connected to the control circuit, but are indirectly, when the contact members are meet.
  • This solution in which the two contact members are integral with the same element, requires isolating them from one another, multiplying the number of parts required and increasing the assembly time. It is easily understood that this solution was adopted insofar as it would have been even more complicated to connect the integral pins of the slides to one of the terminals of the control circuit.
  • Another drawback of this device lies in the fact that it is relatively bulky and that, in order to come into engagement with the fabric, it is necessary to pinch the portion of fabric to be sewn, which complicates the work of the operator.
  • the object of the present invention is to simplify this device both from the point of view of its manufacture and its use and to reduce its size.
  • the device for measuring the passage of a determined length of a fabric in line with the needle of the sewing machine comprises a frame 1 provided with two slides 2 intended to engage in friction in two slides 3 formed on the press - fabric 4 of the sewing machine.
  • This frame has two flanges 1a, 1b in which a shaft 5 is driven.
  • This shaft 5 passes freely through a cylinder 7 secured to an arm 8 carrying the length measuring mechanism which will be described below.
  • the cylinder 7 carries at one end, an eccentric pin 9 which enters a clearance 10 of the flange 1a.
  • This arm 8 carries a fixed rod 15 which extends laterally outwards as well as two pinions 16 and 17 secured to a common shaft 18 rotatably mounted through a bore in the arm 8 parallel to the fixed rod 15.
  • the diameter of the pinion 16 is greater than that of pinion 17.
  • the fixed rod 15 is intended to receive a barrel 19 having a toothing 21 engaged with that of the pinion 17 and containing a spiral spring 20 whose inner end is hooked on a hook 22 integral with this rod 15, then that its outer end is made integral with the internal cylindrical face of the barrel 19.
  • This barrel 19 still carries, on its external face, a pin 23 which extends parallel to its axis.
  • the frame 1 and the arm 8 are made of insulating plastic, while the barrel 19 and its pin 23 are made of metal.
  • a metal wiper 24 intended to be connected to one of the terminals of a control circuit of the machine which will be described later, is fixed to the insulating frame 1 and is intended to bear elastically on the lateral face not toothed barrel 19, to connect it to this terminal of the control circuit.
  • a terminal 24 * of this wiper 24 is located on one face of the frame 1 intended to come into contact with a conductor (not shown) carried by the presser foot 4.
  • a plate 25 (fig 1, 2 and 3), made of insulating material, is pierced with a central opening for the passage of the fixed rod 15 and with an opening in an arc 27 centered on the central opening for the passage of the pin 23 of the barrel 19.
  • This plate 25 is fixed to the arm 8 by means of two screws 26 and carries an elastic electrical contact element 28 disposed at one end of the opening in an arc 27, and having a branch 28a which extends in an annular groove 25a.
  • This drum has a graduation 30 (fig. 1) on its external cylindrical face, which can be moved opposite 'a mark 31 which appears on a rim of the plate 25.
  • This drum also has a groove in an arc 33 centered on the axial opening 32.
  • An elastic contact element 34 is disposed at one end of this groove 33.
  • This drum 29 is made of an electrically insulating material, such as plastic, and it carries a metal ring 35 which projects axially and against the internal face of which a branch 34a of the contact element 34 is supported , as well as the branch 28a of the other contact element 28 secured to the plate 25, when the drum is mounted on the fixed rod 15 and the projecting part of the metal ring 35 enters the groove annular 25a.
  • a wiper 36 presses elastically against the external face of this metal ring 35 and is connected to the second terminal of the control circuit, by its terminal 36 * intended to come into contact with a conductor (not shown), carried by the stuffing box 4. Consequently, the contacts 28 and 34 are connected to the same terminal, while the barrel 19 and its pin 23 are connected to the other terminal.
  • a fixed stop 37 projects from the plate 25; it is intended to enter the groove in an arc 33 of the drum 29 in order to limit the angular travel thereof.
  • the pin 23 of the barrel 19 passes through the opening in an arc 27 and enters the groove in arc of a circle 33.
  • FIG. 5 illustrates an example of use of the measuring device described above, applied to the making of a buttonhole, it being understood that this measuring device can be used for making all kinds of patterns , for example, for repeating a seam of constant length.
  • phase address memory 38 of the different phases of the buttonhole, in this example, there are six of these, illustrated by a portion of electronic memory 39.
  • the phase address memory 38 is connected to a selection of memory 40 which makes it possible to choose a type of buttonhole in this memory and to choose between an automatic mode or a manual mode, the latter consisting in the machine stopping after each phase of the program displayed in the electronic memory 39.
  • This phase address memory 38 is also connected to a phase address counter 41 and to a counter 42 which is connected to a position detector 43 of the needle bar (not shown) and which forms a pulse each time a point is completed
  • This counter 42 is also connected to a block 44 intended to transmit its pulse to one of the inputs of an AND logic element whose output is connected to the address counter of phases 41 and whose second input is connected to a pulse generator block 46, itself connected to the output of an OR logic element 47 whose inputs are connected, on the one hand, to the control device described here above and of which the contact elements 23, 28 and 34 have been represented in a rectangle symbolizing this device and, on the other hand, to a manual contact 48 in the case where the selection of the memory 40 has been chosen to perform manually the buttonhole, i.e. where the start of each phase is controlled by the operator.
  • a pedal 49 connected to a control 50 of a motor 51 for driving the machine.
  • the operator chooses the length of the buttonhole using the drum 29 by turning the scale 30 until the value of this length is located opposite the reference 31. Then, the operator selects the type of buttonhole as well as its embodiment (automatic or manual) using the selection of memory 40 and, from this moment, it starts the machine by pressing the pedal 49. The machine then executes phase 1 of the program represented in the electronic memory 39.
  • a pulse is produced by the pulse generator 46 and transmitted to the logic element ET 45. Since this pulse can occur before the end of a point, the detector position 43 of the needle bar communicates to the counter 42, the moment when the stitch being made is finished. At this time, a pulse appears at the output of block 44, so that the AND logic element 45 produces a signal which it transmits to the phase address counter 41, which indicates, in the phase address memory 38, the end of the current phase. If the operator has chosen an automatic working mode, the phase address memory 38 switches the electronic memory 39 to phase 2 and restarts the sewing process which had been interrupted at the end of phase 1. In the in the case of the so-called "manual" working mode, the operator must actuate the manual contact 48 to initiate the next phase.
  • the machine brings the fabric T back by making a straight seam parallel to the zigzag seam of phase 1.
  • the pinion 16 has not left the fabric, it is turned in the opposite direction, bringing the ankle 23 towards contact 28 and disarming spring 20.
  • phase 3 is repeated, as in the case of the transition from phase 1 to phase 2 described above.
  • phases 4, 5 and 6 are executed successively in the same way, after which the buttonhole is finished.
  • this device can be used to repeat any pattern over the same length determined by the position of the graduation 30 of the drum 29.
  • this graduation 30 Once the length chosen, on this graduation 30, it remains in this position and the pin 23 moves from the fixed contact element 28 to the contact element 34 secured to the drum 29.
  • this pin 23 is brought back against the contact element 28 without the graduation 30 moving, so that the same seam length can be repeated as long as the the position of the graduation 30 of the drum 29 is not modified.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP89810849A 1988-11-30 1989-11-08 Vorrichtung zum Messen des Durchgangs einer vorbestimmten Länge eines Werkstücks am Nähpunkt einer Nähmaschine Expired - Lifetime EP0373105B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4445/88 1988-11-30
CH4445/88A CH677510A5 (de) 1988-11-30 1988-11-30

Publications (2)

Publication Number Publication Date
EP0373105A1 true EP0373105A1 (de) 1990-06-13
EP0373105B1 EP0373105B1 (de) 1992-08-12

Family

ID=4276261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810849A Expired - Lifetime EP0373105B1 (de) 1988-11-30 1989-11-08 Vorrichtung zum Messen des Durchgangs einer vorbestimmten Länge eines Werkstücks am Nähpunkt einer Nähmaschine

Country Status (14)

Country Link
US (1) US5099775A (de)
EP (1) EP0373105B1 (de)
JP (1) JPH02182288A (de)
CN (1) CN1023942C (de)
AU (1) AU618152B2 (de)
BR (1) BR8906044A (de)
CA (1) CA2004065A1 (de)
CH (1) CH677510A5 (de)
DD (1) DD289303A5 (de)
DE (1) DE68902463T2 (de)
ES (1) ES2034753T3 (de)
PT (1) PT92431B (de)
RU (1) RU1838479C (de)
ZA (1) ZA899039B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577330A (en) * 1995-05-05 1996-11-26 Advanced Technologies Limited Measuring device
JP2012012731A (ja) * 2010-07-01 2012-01-19 Brother Ind Ltd ミシン
JP6531005B2 (ja) * 2015-08-03 2019-06-12 蛇の目ミシン工業株式会社 被縫製物の送り量検出が可能なミシン
CN109457396B (zh) * 2018-12-12 2021-03-30 北京大豪科技股份有限公司 花样缝制方法、装置、控制系统及计算机可读存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH548473A (fr) * 1972-06-16 1974-04-30 Mefina Sa Pied presse-etoffe.
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
US4409913A (en) * 1982-08-25 1983-10-18 The Singer Company Buttonhole presser device for sewing machines
EP0170615A2 (de) * 1984-06-27 1986-02-05 Fritz Gegauf Ag Bernina-Nähmaschinenfabrik Knopflochnäheinrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232617A (en) * 1979-04-16 1980-11-11 The Singer Company One-step buttonholer with hall effect sensor
SE8004226L (sv) * 1980-06-05 1981-12-06 Husqvarna Ab Metanordning
US4393797A (en) * 1982-12-13 1983-07-19 The Singer Company Arrangement and method for preventing false triggering in an optically switched buttonhole mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH548473A (fr) * 1972-06-16 1974-04-30 Mefina Sa Pied presse-etoffe.
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
US4409913A (en) * 1982-08-25 1983-10-18 The Singer Company Buttonhole presser device for sewing machines
EP0170615A2 (de) * 1984-06-27 1986-02-05 Fritz Gegauf Ag Bernina-Nähmaschinenfabrik Knopflochnäheinrichtung

Also Published As

Publication number Publication date
ES2034753T3 (es) 1993-04-01
CN1043170A (zh) 1990-06-20
DE68902463T2 (de) 1993-03-25
PT92431A (pt) 1990-05-31
ZA899039B (en) 1990-09-26
AU4570489A (en) 1990-06-07
BR8906044A (pt) 1990-06-19
CH677510A5 (de) 1991-05-31
AU618152B2 (en) 1991-12-12
CA2004065A1 (fr) 1990-05-31
US5099775A (en) 1992-03-31
PT92431B (pt) 1995-09-12
DE68902463D1 (de) 1992-09-17
CN1023942C (zh) 1994-03-09
DD289303A5 (de) 1991-04-25
RU1838479C (ru) 1993-08-30
EP0373105B1 (de) 1992-08-12
JPH02182288A (ja) 1990-07-16

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