EP0451114A2 - Mechanische Vorrichtung für Nähmaschinen für Nähte mit lockeren Stichen - Google Patents

Mechanische Vorrichtung für Nähmaschinen für Nähte mit lockeren Stichen Download PDF

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Publication number
EP0451114A2
EP0451114A2 EP91830095A EP91830095A EP0451114A2 EP 0451114 A2 EP0451114 A2 EP 0451114A2 EP 91830095 A EP91830095 A EP 91830095A EP 91830095 A EP91830095 A EP 91830095A EP 0451114 A2 EP0451114 A2 EP 0451114A2
Authority
EP
European Patent Office
Prior art keywords
stitching
needle
sewing machines
mechanical device
fact
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.)
Withdrawn
Application number
EP91830095A
Other languages
English (en)
French (fr)
Other versions
EP0451114A3 (en
Inventor
Mario Brutti
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.)
Cmcila Mocassino Di Berdini Ezio & C SNC
Original Assignee
Cmcila Mocassino Di Berdini Ezio & C SNC
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 Cmcila Mocassino Di Berdini Ezio & C SNC filed Critical Cmcila Mocassino Di Berdini Ezio & C SNC
Publication of EP0451114A2 publication Critical patent/EP0451114A2/de
Publication of EP0451114A3 publication Critical patent/EP0451114A3/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B61/00—Loop holders; Loop spreaders; Stitch-forming fingers

Definitions

  • the object of this patent application is a mechanical device which enables sewing machines to produce slack stitching, so that two edges sewn together have a certain degree of play and can settle into position.
  • Mocassins are those shoes without laces with a front part covering the metatarsal and toes of the foot, which is sewn along its upper edge to the outer edge of the upper covering the top of the foot.
  • the two parts are sewn together once the top edge of the front part has been carefully positioned beneath the upper so that the two edges are aligned and their internal surfaces placed precisely together.
  • the edge of the upper is pinched inside the folded over edge of the front part.
  • the seam has to be forced apart so that the upper can settle and assume its typical "tunnel" like shape.
  • the front part and upper require shaping so that the two pieces of leather form a stable right-angle, with the front piece on a vertical plane and the upper on a horizontal plane, as opposed to the side by side position they tend to keep to once they have been sewn.
  • the device according to the invention has been designed with the above object in mind, and is absolutely new to the shoe industry, in as much as there are currently no accessory devices available for sewing machines which, without having any effect on the thread tension, allow stitches to be sewn that are slack enough to give the two pieces of shoe upper ample room to settle.
  • the mechanical device has a ring of closely positioned horizontal pins which are held and moved around their circuit by a drive chain. Each of the aforementioned pins is periodically expelled by a push-rod driven by a cam, which moves the pin in the drive chain at the right moment.
  • the emission and retraction of the pins is synchronized with the movement of the needle in such a way that there are pins under the upper thread of the last two stitches made when the needle is rising and the thread is put under tension; the pin under the next to last stitch is automatically pulled out from under the stitch when the needle next descends; and a third pin is automatically expelled from the chain ready to go under the next stitch to be made, and so on.
  • a pin is placed between the two layers of leather and the top thread at the moment the stitching is being finally tightened, thereby preventing the top thread from being overtightened, and consequently, once the pin has been retracted, the stitching is slack.
  • the device includes a casing (1) housing a looped chain (2), travelling around two closely positioned toothed sprocket wheels (3 and 4) whose axes are on a horizontal plane, of which one is a drive sprocket (3) and the other a guide sprocket (4).
  • the links of the chain are connected together by horizontal tubular pins (2a) each containing a longer pin (5) which can be moved back and forth within the tubular pin (2a) and thus be expelled or retracted in respect of the front face of the chain (2).
  • the cam (8) is cylindrical and turns about a horizontal axis and has two identical specially shaped channels (8a and 8b) on its side face, these channels being out of phase with each other by 90 degrees.
  • each of the channels (8a and 8b) has a straight section corresponding to approximately half the circumference of the cam, and a lateral "V" shaped section with rounded corners connecting the two ends of the straight section.
  • both the push-rods (6 and 7) move both back and forth, although their movements are out of phase by 90 degrees.
  • Each complete revolution of the cam (8) corresponds to one stitch being made by the sewing machine; in other words, during one complete revolution of the cam (8), the needle on the sewing machine leaves its upper rest point, descends, and rises again to its upper rest point.
  • cam (8) is shown as a dotted line as it is above the plane of the drawing.
  • the front of the casing (1) is closed by a cover plate (1a) with a long curve slot in it (1b), through which the expelled pin (5) can come out of the front of the casing (1), and the casing (1) is attached in a position immediately behind the needle (A), as schematically shown in Figures 4 to 7.
  • Figure 4 shows the needle (A) on the last part of its rising stroke towards the upper rest point when the thread from the needle (FA) is tensioned after having been tied with the crochet thread (FC).
  • a push-rod (7) causes the pin (5) under the top thread of the last stitch but one to retract, as in Figure 6.
  • the needle (A) begins to rise towards its upper rest point, and to tension the thread during the last part of this movement.
  • a push-rod (6) pushes a new pin (5) out through the slot (1b) during the last part of this return stroke by the needle, as shown in Figure 4.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP19910830095 1990-03-23 1991-03-12 Mechanical device for sewing machines for slack-stitching Withdrawn EP0451114A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT61490 1990-03-23
IT614A IT1241956B (it) 1990-03-23 1990-03-23 Dispositivo meccanico per macchine cucitrici per la realizzazione di punti di cucitura lenti.

Publications (2)

Publication Number Publication Date
EP0451114A2 true EP0451114A2 (de) 1991-10-09
EP0451114A3 EP0451114A3 (en) 1992-09-09

Family

ID=11099884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910830095 Withdrawn EP0451114A3 (en) 1990-03-23 1991-03-12 Mechanical device for sewing machines for slack-stitching

Country Status (2)

Country Link
EP (1) EP0451114A3 (de)
IT (1) IT1241956B (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2935382A1 (de) * 1978-09-28 1980-04-10 Kochs Adler Ag Naehmaschine zur herstellung von wulstnaehten an mokassin-schuhen
DE3220708A1 (de) * 1982-06-02 1983-12-08 H. Stoll Gmbh & Co, 7410 Reutlingen Flachstrickmaschine
DE3515189C1 (de) * 1985-04-26 1986-11-06 J. Strobel & Söhne - GmbH & Co, 8000 München Kettenstich-Blindstichnaehmaschine zum punktweisen Vernaehen des Naehgutes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2935382A1 (de) * 1978-09-28 1980-04-10 Kochs Adler Ag Naehmaschine zur herstellung von wulstnaehten an mokassin-schuhen
DE3220708A1 (de) * 1982-06-02 1983-12-08 H. Stoll Gmbh & Co, 7410 Reutlingen Flachstrickmaschine
DE3515189C1 (de) * 1985-04-26 1986-11-06 J. Strobel & Söhne - GmbH & Co, 8000 München Kettenstich-Blindstichnaehmaschine zum punktweisen Vernaehen des Naehgutes

Also Published As

Publication number Publication date
IT1241956B (it) 1994-02-01
IT9000614A0 (it) 1990-03-23
EP0451114A3 (en) 1992-09-09
IT9000614A1 (it) 1991-09-23

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