EP0468892A1 - Fadenabschneideeinrichtung für Nähmaschinen mit mehreren Nadeln - Google Patents

Fadenabschneideeinrichtung für Nähmaschinen mit mehreren Nadeln Download PDF

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Publication number
EP0468892A1
EP0468892A1 EP91402075A EP91402075A EP0468892A1 EP 0468892 A1 EP0468892 A1 EP 0468892A1 EP 91402075 A EP91402075 A EP 91402075A EP 91402075 A EP91402075 A EP 91402075A EP 0468892 A1 EP0468892 A1 EP 0468892A1
Authority
EP
European Patent Office
Prior art keywords
fabric
cutting
relative
knife
shuttles
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Withdrawn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
EP91402075A
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English (en)
French (fr)
Inventor
Georges Campin
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.)
TEXTILE INDUSTRIELLE SOTEXI Ste
Original Assignee
TEXTILE INDUSTRIELLE SOTEXI Ste
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 TEXTILE INDUSTRIELLE SOTEXI Ste filed Critical TEXTILE INDUSTRIELLE SOTEXI Ste
Publication of EP0468892A1 publication Critical patent/EP0468892A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/20—Arrangements for cutting the needle or lower threads

Definitions

  • the present invention relates to a thread cutter device for multi-needle sewing machines intended for cutting the residual threads of the seams.
  • the manufacture of lined, quilted fabrics, with sewn patterns or areas of padding ... is generally carried out by means of sewing machines comprising a plurality of synchronized needles, shuttles or hooks to make knotted stitch seams or chain stitches and means for relative displacement of the fabric with respect to the needles.
  • the sectioning of the residual threads of the seams is carried out by means of traditional thread-cutting devices which operate in two stages, the first stage (forward stroke of the device) occurs at the end of the last point, during the raising of the needle, and aims to grab the threads to be cut and stretch them by a determined length to ensure correct restarting of the seam after cutting.
  • the second step (return stroke of the device) consists of the actual cutting of the wires.
  • the needles are supplied with thread by bobbins and the shuttles or hooks include a thread-feeding member of the cocoon, bobbin or bobbin type.
  • the object of the present invention is to simplify the operation of cutting residual threads and to adapt it to multi-needle, multi-head or multi-bar machines with shuttles or hooks.
  • a thread cutting device for multi-needle sewing machines with shuttles or hooks intended for cutting the residual threads of the seams comprising cutting means and means for relative movement of the fabric. with respect to the needles and the shuttles or hooks for stretching a certain length of thread, on the one hand between the stopping points of the seams and the needles passing through openings made through a holding member in contact with the upper side of the fabric and on the other hand between said stopping points and the shuttles or hooks passing through openings made through a perforated plate in contact with the underside of the fabric, characterized in that said cutting means comprise at least one knife movable relative to the fabric, in contact with each of its faces, and capable of simultaneously cutting several residual wires flush with the fabric.
  • said knife consists of a straight straight blade with a cutting edge moving longitudinally relative to the fabric.
  • said knife consists of a straight rod provided on a lateral edge with teeth which extend in an inclined manner, relative to the longitudinal axis of the rod, and whose internal edge is sharp, said rod being moved transversely and alternately with respect to the fabric so that the sharp edges of the teeth cut the residual threads of the seams.
  • Another object of the invention is a method of cutting the residual threads of the seams produced by means of a multi-needle sewing machine with shuttles or hooks comprising the relative displacement of the fabric relative to the needles and the shuttles or hooks for stretching a certain length of thread on the one hand between the stopping points of the seams and the needles and on the other hand between said stopping points and the shuttles or hooks then the cutting of the residual threads, characterized in that one cuts simultaneously all the residual threads on the same face of the fabric, flush with the stopping points, by relative displacement of at least one knife with respect to each of said faces.
  • a lateral displacement of the knife is carried out relative to the tissue while maintaining it in bearing contact at the level of its cutting parts.
  • a longitudinal reciprocating movement of the knife is carried out relative to the tissue while keeping it in bearing contact at the level of its cutting parts.
  • a lateral movement of the fabric is carried out relative to the knife.
  • Figure 1 shows a cross-sectional view of the implementation of the device of the invention at a seam.
  • FIG. 2 represents a top view of an embodiment of the device of the invention.
  • FIG. 3 represents a view in longitudinal section of the implementation of the device of FIG. 2.
  • Figures 4 and 5 respectively show a vertical sectional perspective view of an alternative embodiment of the device of the invention.
  • the positions of the hands 1 are identified in FIG. 2 by the letters a to h.
  • the padded fabric 3 is placed between the needle plate 4 and a fabric retaining member constitutes the pressure plate 5.
  • the needles are immobilized outside the fabric, and the pressure plate is slightly raised so as to allow movement of the fabric, but nevertheless remains in contact with this one.
  • the fabric 3 is then moved in the longitudinal direction by means not shown, but forming part of the conventional equipment of wadding machines, so as to stretch upper thread 8 between the needles and the stopping points and thread lower 9 between the shuttles 2 and the stopping points and to bring the end of the stopping points (that is to say the point of exit of the threads 8 and 9 of the fabric 3) in the immediate vicinity of the cutting means consisting of knives 10 and 11.
  • the end of the stopping points that is to say the point of exit of the threads 8 and 9 of the fabric
  • the knives 10, 11 consist of a straight rod 10a provided on its lateral edge with teeth 10b which extend in an inclined relation to the longitudinal axis of the rod 10a and the internal edge of which, opposite the rod, is sharp.
  • the ends of the teeth 10b are slightly rounded and curved to protrude and press on the padded fabric 3.
  • the fabric is then immobilized and the knives 10 and 11 are then moved transversely relative to the longitudinal direction of the fabric by means of, for example, jacks 12 During this movement, the rounded ends of the upper 10 and lower 11 knives corresponding to the rows a to d as shown in FIG. 2 slide between the padded fabric and the threads to be cut, respectively 8 and 9, then the part sharp knives located in their concave area cuts all these wires simultaneously at the stop points.
  • the set of knives is then immobilized, then always moved transversely but in the opposite direction to cut this time simultaneously all the upper and lower threads of rows e to h. Once all the threads have been cut, the fabric can be moved again and brought to the chosen position to start a new sewing.
  • the teeth are divided into two series corresponding respectively to needles a-d and e-h symmetrical with respect to the center of the rod 10a so that all the teeth are oriented towards the corresponding edge of the tissue. In this way, the edge of the fabric cannot be caught in the teeth of the knives and deteriorated during the transverse movements of the knives, or during the lateral movements of the fabric.
  • the upper 10 and lower 11 knives have been placed at the same distance from the needle holes. This arrangement allows the simultaneous cutting of the upper 8 and lower 9 threads after a single movement of the fabric.
  • the upper knives are placed at a greater distance from the needle than the lower knives: respectively d1 and d2.
  • the cutting of the threads is then carried out as follows: the fabric is firstly displaced by the distance d2 to bring the stopping points of the lower threads 9 near the lower knives 11. These are actuated (round trip) alternately in one direction, then in the other, to cut all the wires lower. The fabric is then redeployed by a distance equal to the difference d1 minus d2, to bring the stopping points of the upper threads 8 within reach of the upper knives 10. These are actuated in turn (round trip) to cut all upper threads 8. In this case, it is possible to choose respective positions for the upper and lower knives providing different lengths of residual threads to the needle and to the shuttle. This possibility removes the thread tails visible when restarting the seam
  • a variant consists in making the knives in two separate parts symmetrical with respect to the longitudinal axis of the fabric, so that all the threads of rows a-d and e-h can be cut simultaneously.
  • the two parts being, for example, actuated by means of two separate cylinders.
  • the latter consist of a straight straight blade with a sharp edge capable of moving along its longitudinal axis.
  • the knives can be at least partially integrated into the thicknesses of the needle plate and of the holding member so as not to hinder the movements of the fabric. Only the rounded ends must protrude to capture the wires to be cut.
  • FIG. 4 and 5 is particularly advantageous, because it avoids the lifting of the holding member.
  • This variant consists in providing an independent holding member 55 for each row of needles and in producing the knife in the form of independent teeth 100 mounted on a transverse support bar inclined 110 relative to the plane of the fabric and made integral with said holding member. 55.
  • These teeth have a first part 101 inclined towards the fabric and intended for fixing to the bar and a second part 102 extending parallel to the plane of the fabric oriented towards its edge and comprising a cutting edge for cutting ending in a rounded end 103 intended for the capture of the wire prior to cutting.
  • each needle (ah) corresponds a tooth 100 and the bar 110 may possibly be produced in two symmetrical parts with respect to the longitudinal axis of the fabric to obtain a simultaneous cut of all the wires by symmetrical displacements of the two half-bars.
  • additional devices can be added to cooperate with the means described above.
  • devices for opening voltages, wire pullers or any other accessory known and usually used in wire cutters without departing from the scope of the present invention.
EP91402075A 1990-07-26 1991-07-25 Fadenabschneideeinrichtung für Nähmaschinen mit mehreren Nadeln Withdrawn EP0468892A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009580 1990-07-26
FR9009580A FR2665192B1 (fr) 1990-07-26 1990-07-26 Dispositif coupe-fils pour machines a coudre multi-aiguilles.

Publications (1)

Publication Number Publication Date
EP0468892A1 true EP0468892A1 (de) 1992-01-29

Family

ID=9399141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402075A Withdrawn EP0468892A1 (de) 1990-07-26 1991-07-25 Fadenabschneideeinrichtung für Nähmaschinen mit mehreren Nadeln

Country Status (2)

Country Link
EP (1) EP0468892A1 (de)
FR (1) FR2665192B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202891A1 (de) * 1991-11-08 1993-05-19 Saurer Sticksysteme Ag Fadenklemm- und schneideinrichtung fuer den hinten- oder unterfaden einer stickmaschine
DE4300846A1 (de) * 1993-01-15 1994-07-21 Saurer Sticksysteme Ag Arbon Schneide- und Klemmeinrichtung für Vordergarn für Stickmaschinen
EP0666352A1 (de) * 1994-02-05 1995-08-09 Saurer Sticksysteme Ag Verfahren zum Ansticken der Nadel- und Schiffchenfäden am Stoff einer Stickmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6560913B2 (ja) * 2015-06-26 2019-08-14 Juki株式会社 ミシン

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE292273C (de) *
GB191012185A (en) * 1910-05-18 1910-09-22 Morris Schoenfeld Device for Holding and Cutting Threads on Embroidering Machines.
US2376417A (en) * 1944-06-13 1945-05-22 Chudner Joseph Thread cutter
DE3023159A1 (de) * 1979-06-29 1981-01-08 August Heinzle Stickmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB121851A (en) * 1918-02-14 1919-01-09 George Powell Walker Improvements in or relating to Razor Strops.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE292273C (de) *
GB191012185A (en) * 1910-05-18 1910-09-22 Morris Schoenfeld Device for Holding and Cutting Threads on Embroidering Machines.
US2376417A (en) * 1944-06-13 1945-05-22 Chudner Joseph Thread cutter
DE3023159A1 (de) * 1979-06-29 1981-01-08 August Heinzle Stickmaschine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202891A1 (de) * 1991-11-08 1993-05-19 Saurer Sticksysteme Ag Fadenklemm- und schneideinrichtung fuer den hinten- oder unterfaden einer stickmaschine
US5383416A (en) * 1991-11-08 1995-01-24 Saurer Sticksysteme Thread clamping and cutting apparatus for the rear or lower thread of an embroidering machine
DE4300846A1 (de) * 1993-01-15 1994-07-21 Saurer Sticksysteme Ag Arbon Schneide- und Klemmeinrichtung für Vordergarn für Stickmaschinen
US5477793A (en) * 1993-01-15 1995-12-26 Sauer Sticksysteme Ag Cutting and nipping apparatus for the front yarn for embroidery machines
EP0666352A1 (de) * 1994-02-05 1995-08-09 Saurer Sticksysteme Ag Verfahren zum Ansticken der Nadel- und Schiffchenfäden am Stoff einer Stickmaschine

Also Published As

Publication number Publication date
FR2665192A1 (fr) 1992-01-31
FR2665192B1 (fr) 1992-11-27

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