EP0468892A1 - Thread cutting device for multi-needle sewing machine - Google Patents

Thread cutting device for multi-needle sewing machine 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
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EP
European Patent Office
Prior art keywords
fabric
cutting
relative
knife
shuttles
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EP91402075A
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German (de)
French (fr)
Inventor
Georges Campin
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TEXTILE INDUSTRIELLE SOTEXI Ste
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TEXTILE INDUSTRIELLE SOTEXI Ste
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Publication of EP0468892A1 publication Critical patent/EP0468892A1/en
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    • 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.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The invention relates to a thread-cutting device for multi-needle sewing machines with shuttles or hooks (2), which is intended for severing the residual threads of the stitches, comprising cutting means and means for the relative displacement of the fabric (3) in relation to the needles (1) (a-h) and to the shuttles or hooks (2), in order to draw a particular length of thread (8, 9) on the one hand between the stopping points (7) of the stitches and the needles, passing by way of orifices made through a holding member (5) in contact with the upper face of the fabric and on the other hand between said stopping points and the shuttles or hooks (2), passing by way of orifices made through a perforated plate (4) in contact with the lower face of the fabric, characterised in that said cutting means comprise at least one knife (10, 11) moveable relative to the fabric, in contact with each of its faces and capable of simultaneously severing a plurality of residual threads flush with the fabric. <IMAGE>

Description

La présente invention concerne un dispositif coupe-fils pour machines à coudre multi-aiguilles destiné au sectionnement des fils résiduels des coutures.The present invention relates to a thread cutter device for multi-needle sewing machines intended for cutting the residual threads of the seams.

La fabrication de tissus doublés, ouatinés, présentant des motifs cousus ou des zones de rembourrage... s'effectue généralement au moyen de machines à coudre comportant une pluralité d'aiguilles synchronisées, des navettes ou crochets pour réaliser des coutures à points noués ou points de chaînette et des moyens de déplacement relatif du tissu par rapport aux aiguilles.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.

Dans le cas où le tissu est réalisé avec des coutures interrompues et séparées par des espaces non cousus, une certaine longueur de fil est étirée d'une part entre les points d'arrêt des coutures et les aiguilles en passant par des ouvertures pratiquées au travers d'un organe de maintien tel que par exemple une plaque de pression ou des pieds presseurs au contact de la face supérieure du tissu et d'autre part entre lesdits points d'arrêt et les navettes ou crochets en passant par des ouvertures pratiquées au travers d'une plaque perforée ou plaque à aiguilles au contact de la face inférieure du tissu. Il est alors nécessaire de couper les fils résiduels entre chaque couture à la fois pour des raisons économiques et esthétiques.In the case where the fabric is made with interrupted seams and separated by unsewn spaces, a certain length of thread is stretched on the one hand between the stopping points of the seams and the needles passing through openings made through a holding member such as for example a pressure plate or presser feet in contact with the upper face 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 or needle plate in contact with the underside of the fabric. It is then necessary to cut the residual threads between each seam for both economic and aesthetic reasons.

Le sectionnement des fils résiduels des coutures est effectué au moyen de dispositifs coupe-fils traditionnels qui opèrent en deux temps, le premier temps (course aller du dispositif) intervient à la fin du dernier point, lors de la remontée de l'aiguille, et a pour but de saisir les fils à couper et de les étirer d'une longueur déterminée pour assurer le redémarrage correct ultérieur de la couture après la coupe. Le deuxième temps (course retour du dispositif) consiste en la coupe proprement dite des fils.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.

Dans tous les cas, les aiguilles sont alimentées en fil par des bobines et les navettes ou les crochets comportent un organe débiteur de fil du type cocon, canette ou bobine.In all cases, 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.

Les dispositifs coupe-fils connus sont difficilement applicables aux machines multi-aiguilles, car chaque aiguille doit être équipée d'un dispositif complet, ce qui entraîne des coûts élevés et parfois un encombrement excessif (cas des machines à ouatiner à navettes en particulier).Known thread cutting devices are difficult to apply to multi-needle machines, since each needle must be equipped with a complete device, which leads to high costs and sometimes excessive congestion (in the case of paddling machines with shuttles in particular).

La présente invention a pour but de simplifier l'opération de coupe des fils résiduels et de l'adapter aux machines multi-aiguilles, multitêtes ou multibarres à navettes ou à crochets.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.

Ce but est atteint conformément à l'invention au moyen d'un dispostif coupe-fils pour machines à coudre multi-aiguilles à navettes ou crochets destiné au sectionnement des fils résiduels des coutures comprenant des moyens de coupe et des moyens de déplacement relatif du tissu par rapport aux aiguilles et aux navettes ou crochets pour étirer une certaine longueur de fil, entre d'une part les points d'arrêt des coutures et les aiguilles en passant par des ouvertures pratiquées au travers d'un organe de maintien au contact de la face supérieure du tissu et d'autre part entre lesdits points d'arrêt et les navettes ou crochets en passant par des ouvertures pratiquées au travers d'une plaque perforée au contact de la face inférieure du tissu, caractérisé en ce que lesdits moyens de coupe comprennent au moins un couteau mobile par rapport au tissu, au contact de chacune de ses faces, et capable de sectionner simultanément plusieurs fils résiduels au ras du tissu.This object is achieved in accordance with the invention by means of 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.

Selon une caractéristique avantageuse, ledit couteau est constitué d'une lame droite continue à bord tranchant se déplaçant longitudinalement par rapport au tissu.According to an advantageous characteristic, said knife consists of a straight straight blade with a cutting edge moving longitudinally relative to the fabric.

Selon encore une autre variante, ledit couteau est constitué d'une tige droite pourvue sur un bord latéral de dents qui s'étendent de façon inclinée, par rapport à l'axe longitudinal de la tige, et dont le bord interne est tranchant, ladite tige étant déplacée de façon transversale et alternative par rapport au tissu de telle sorte que les bords tranchants des dents viennent sectionner les fils résiduels des coutures.According to yet another variant, 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.

Un autre objet de l'invention est un procédé de coupe des fils résiduels des coutures réalisées au moyen d'une machine à coudre multi-aiguilles à navettes ou crochets comprenant le déplacement relatif du tissu par rapport aux aiguilles et aux navettes ou crochets pour étirer une certaine longueur de fil d'une part entre les points d'arrêt des coutures et les aiguilles et d'autre part entre lesdits points d'arrêt et les navettes ou crochets puis la coupe des fils résiduels, caractérisé en ce qu'on coupe simultanément tous les fils résiduels d'une même face du tissu, au ras des points d'arrêt, par déplacement relatif d'au moins un couteau par rapport à chacune desdites faces.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.

Selon une variante avantageuse de mise en oeuvre du procédé, on effectue un déplacement latéral du couteau par rapport au tissu en le maintenant en contact d'appui au niveau de ses parties tranchantes.According to an advantageous variant of the implementation of the method, 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.

Selon encore une autre variante, on effectue un déplacement alternatif longitudinal du couteau par rapport au tissu en le maintenant en contact d'appui au niveau de ses parties tranchantes.According to yet another variant, 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.

Selon une troisième variante, on effectue un déplacement latéral du tissu par rapport au couteau.According to a third variant, a lateral movement of the fabric is carried out relative to the knife.

La présente invention sera mieux comprise à la lecture de ce qui suit, où il est fait référence à une machine multi-aiguilles à une seule barre d'aiguilles et à navettes, pour simplifier la description et les dessins. Le dispositif peut toutefois s'adapter à tout autre type de machine sans sortir du cadre de l'invention, et en particulier aux machines à deux ou trois barres à aiguilles (chaque barre à aiguilles étant équipée d'un dispositif similaire agissant en général en synchronisme) et aux machines multi-aiguilles ou multitêtes à crochets avec canettes ou crochets avec bobines.The present invention will be better understood on reading the following, where reference is made to a multi-needle machine with a single bar of needles and shuttles, to simplify the description and the drawings. The device can however be adapted to any other type of machine without departing from the scope of the invention, and in particular to machines with two or three needle bars (each needle bar being equipped with a similar device generally acting in synchronism) and multi-needle or multi-head hook machines with bobbins or hooks with bobbins.

La figure 1 représente une vue en coupe transversale de la mise en oeuvre du dispositif de l'invention au niveau d'une couture.Figure 1 shows a cross-sectional view of the implementation of the device of the invention at a seam.

La figure 2 représente une vue de dessus d'un mode de réalisation du dispositif de l'invention.FIG. 2 represents a top view of an embodiment of the device of the invention.

La figure 3 représente une vue en coupe longitudinale de la mise en oeuvre du dispositif de la figure 2.FIG. 3 represents a view in longitudinal section of the implementation of the device of FIG. 2.

Les figures 4 et 5 représentent respectivement une vue en coupe verticale et en perspective d'une variante de réalisation du dispositif de l'invention.Figures 4 and 5 respectively show a vertical sectional perspective view of an alternative embodiment of the device of the invention.

Sur les figures, les mécanismes de commande des aiguilles 1 et des navettes 2 n'ont pas été représentés.In the figures, the control mechanisms for the needles 1 and the shuttles 2 have not been shown.

Les positions des aiguilles 1 sont repérées sur la figure 2 par les lettres a à h. Le tissu ouatiné 3 est disposé entre la plaque à aiguilles 4 et un organe de maintien du tissu constitue de la plaque de pression 5.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.

Une fois la couture terminée par un point d'arrêt resserré (ou point de renfort) 7, les aiguilles sont immobilisées hors du tissu, et la plaque de pression est légèrement relevée de façon à permettre un déplacement du tissu, mais reste toutefois en contact avec celui-ci. Le tissu 3 est alors déplacé dans le sens longitudinal grâce à des moyens non représentés, mais faisant partie de l'équipement classique des machines à ouatiner, de façon à étirer du fil supérieur 8 entre les aiguilles et les points d'arrêt et du fil inférieur 9 entre les navettes 2 et les points d'arrêt et à amener la fin des points d'arrêt (c'est-à-dire le point de sortie des fils 8 et 9 du tissu 3) à proximité immédiate des moyens de coupe constitués des couteaux 10 et 11. Dans le mode de réalisation de la figure 2, les couteaux 10, 11 sont constitués d'une tige droite 10a pourvue sur son bord latéral de dents 10b qui s'étendent de façon inclinée par rapport à l'axe longitudinal de la tige 10a et dont le bord interne, en regard de la tige, est tranchant. Les extrémités des dents 10b sont légèrement arrondies et recourbées pour faire saillie et appuyer sur le tissu ouatiné 3. Le tissu est ensuite immobilisé et les couteaux 10 et 11 sont alors déplacés transversalement par rapport au sens longitudinal du tissu au moyen par exemple de vérins 12. Au cours de ce déplacement, les extrémités arrondies des couteaux supérieurs 10 et inférieurs 11 correspondant aux rangs a à d tels que représentés sur la figure 2 se glissent entre le tissu ouatiné et les fils à couper, respectivement 8 et 9, puis la partie tranchante des couteaux située dans leur zone concave vient sectionner tous ces fils simultanément au ras des points d'arrêt. L'ensemble des couteaux est ensuite immobilisé, puis déplacé toujours transversalement mais en sens inverse pour couper cette fois simultanément tous les fils supérieurs et inférieurs des rangs e à h. Une fois tous les fils coupés, le tissu peut être déplacé à nouveau et amené dans la position choisie pour commencer une nouvelle couture.Once the seam is finished with a tightened stopping point (or reinforcement stitch) 7, 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. In the embodiment of FIG. 2, 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.

Dans le dispositif représenté sur la figure 2, les dents sont réparties en deux séries correspondant respectivement aux aiguilles a-d et e-h symétriques par rapport au centre de la tige 10a de façon que toutes les dents soient orientées vers la lisière correspondante du tissu. De cette façon, la lisière du tissu ne peut pas être prise dans les dents des couteaux et détériorée lors des déplacements transversaux des couteaux, ou lors des déplacements latéraux du tissu.In the device shown in Figure 2, 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.

Dans le dispositif représenté sur les figures, c'est le déplacement des couteaux qui coupe les fils, mais on peut aisément imaginer une réalisation différente dans laquelle les couteaux seraient immobiles et la coupe obtenue par un déplacement latéral alternatif du tissu pour couper d'abord les fils des rangs a à d, puis les autres fils. Dans cette réalisation, il n'est point nécessaire de prévoir de moyen propre à déplacer les couteaux, et ce sont les moyens existants de déplacement du tissu qui opèrent pour étirer les longueurs de fils et les couper.In the device shown in the figures, it is the movement of the knives which cuts the threads, but one can easily imagine a different embodiment in which the knives are stationary and the cut obtained by an alternative lateral movement of the fabric to cut first the sons of rows a to d, then the other sons. In this embodiment, it is not necessary to provide means suitable for moving the knives, and it is the existing means for moving the fabric which operate to stretch the lengths of son and cut them.

Par ailleurs, dans le dispositif représenté sur les figures, les couteaux supérieurs 10 et inférieurs 11 ont été placés à la même distance des trous d'aiguilles. Cette disposition autorise la coupe simultanée des fils supérieurs 8 et inférieurs 9 après un déplacement unique du tissu. Dans une autre réalisation possible du dispositif selon l'invention, les couteaux supérieurs sont placés à une distance de l'aiguille plus importante que les couteaux inférieurs : respectivement d1 et d2.Furthermore, in the device shown in the figures, 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. In another possible embodiment of the device according to the invention, the upper knives are placed at a greater distance from the needle than the lower knives: respectively d1 and d2.

La coupe des fils est alors effectuée comme suit : le tissu est tout d'abord déplacé de la distance d2 pour amener les points d'arrêt des fils inférieurs 9 à proximité des couteaux inférieurs 11. Ceux-ci sont actionnés (aller-retour) alternativement dans un sens, puis dans l'autre, pour couper l'ensemble des fils inférieurs. Le tissu est ensuite redéplacé d'une distance égale à la différence d1 moins d2, pour amener les points d'arrêt des fils supérieurs 8 à portée des couteaux supérieurs 10. Ceux-ci sont actionnés à leur tour (aller-retour) pour couper tous les fils supérieurs 8. Dans ce cas, il est possible de choisir des positions respectives pour les couteaux supérieurs et inférieurs procurant des longueurs de fils résiduelles différentes à l'aiguille et à la navette. Cette possibilité permet de supprimer les queues de fils visibles au redémarrage de la coutureThe 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

Une variante consiste à réaliser les couteaux en deux parties séparées symétriques par rapport à l'axe longitudinal du tissu, de façon à pouvoir couper simultanément tous les fils des rangs a-d et e-h. Les deux parties étant, par exemple, actionnées au moyen de deux vérins séparés.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.

Selon un autre mode de réalisation des couteaux, ces derniers sont constitués d'une lame droite continue à bord tranchant susceptible de se déplacer suivant son axe longitudinal.According to another embodiment of the knives, the latter consist of a straight straight blade with a sharp edge capable of moving along its longitudinal axis.

Les couteaux peuvent être au moins partiellement intégrés dans les épaisseurs de la plaque à aiguille et de l'organe de maintien pour ne pas gêner les déplacements du tissu. Seules les extrémités arrondies doivent faire saillie pour capturer les fils à couper.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.

Le mode de réalisation des figures 4 et 5 est particulièrement avantageux, car il permet d'éviter le relevage de l'organe de maintien. Cette variante consiste à prévoir un organe de maintien 55 indépendant pour chaque rangée d'aiguilles et à réaliser le couteau sous forme de dents indépendantes 100 montées sur une barre de support transversale inclinée 110 par rapport au plan du tissu et rendue solidaire dudit organe de maintien 55. Ces dents comportent une première partie 101 inclinée vers le tissu et destinée à la fixation sur la barre et une deuxième partie 102 s'étendant parallèlement au plan du tissu orientée vers sa lisière et comportant un bord tranchant pour la coupe se terminant par une extrémité arrondie 103 destinée à la capture du fil préalablement à la coupe.The embodiment of Figures 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.

Dans cette configuration, à chaque aiguille (a-h) correspond une dent 100 et la barre 110 peut éventuellement être réalisée en deux parties symétriques par rapport à l'axe longitudinal du tissu pour obtenir une coupe simultanée de tous les fils par des déplacements symétriques des deux demi-barres. Tout comme dans les dispositifs coupe-fils connus, des dispositifs annexes peuvent être ajoutés pour coopérer avec les moyens décrits ci-dessus. C'est ainsi qu'on peut imaginer des dispositifs d'ouverture des tensions, de tire-fils ou tout autre accessoire connu et habituellement utilisé dans les dispositifs coupe-fils, et ce sans sortir du cadre de la présente invention.In this configuration, 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. As in the known wire cutters, additional devices can be added to cooperate with the means described above. Thus one can imagine 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.

Claims (13)

Dispositif coupe-fils pour machines à coudre multi-aiguilles à navettes ou crochets (2) destiné au sectionnement des fils résiduels des coutures comprenant des moyens de coupe et des moyens de déplacement relatif du tissu (3) par rapport aux aiguilles (1) (a-h) et aux navettes ou crochets (2) pour étirer une certaine longueur de fil (8, 9), entre d'une part les points d'arrêt (7) des coutures et les aiguilles en passant par des ouvertures pratiquées au travers d'un organe de maintien (5) au contact de la face supérieure du tissu et d'autre part entre lesdits points d'arrêt et les navettes ou crochets (2) en passant par des ouvertures pratiquées au travers d'une plaque perforée (4) au contact de la face inférieure du tissu, caractérisé en ce que lesdits moyens de coupe comprennent au moins un couteau mobile (10, 11) par rapport au tissu, au contact de chacune de ses faces, et capable de sectionner simultanément plusieurs fils résiduels au ras du tissu.Thread cutting device for multi-needle sewing machines with shuttles or hooks (2) intended for cutting the residual threads of the seams comprising cutting means and means for relative displacement of the fabric (3) relative to the needles (1) ( ah) and with the shuttles or hooks (2) to stretch a certain length of thread (8, 9), on the one hand between the stopping points (7) of the seams and the needles passing through openings made through '' a holding member (5) in contact with the upper face of the fabric and on the other hand between said stopping points and the shuttles or hooks (2) passing through openings made through a perforated plate (4 ) in contact with the underside of the fabric, characterized in that said cutting means comprise at least one movable knife (10, 11) relative to the fabric, in contact with each of its faces, and capable of simultaneously cutting several residual wires flush with the fabric. Dispositif selon la revendication 1, caractérisé en ce que ledit couteau est constitué d'une lame droite continue à bord tranchant se déplaçant longitudinalement par rapport au tissu.Device according to claim 1, characterized in that said knife consists of a continuous straight blade with a cutting edge moving longitudinally relative to the fabric. Dispositif selon la revendication 1, caractérisé en ce que ledit couteau (10) est constitué d'une tige droite (10a) pourvue sur un bord latéral de dents (10b) qui s'étendent de façon inclinée, par rapport à l'axe longitudinal de la tige, et dont le bord interne est tranchant, ladite tige étant déplacée de façon transversale et alternative par rapport au tissu, de telle sorte que les bords tranchants desdents viennent sectionner les fils résiduels des coutures.Device according to Claim 1, characterized in that the said knife (10) consists of a straight rod (10a) provided on a lateral edge with teeth (10b) which extend in an inclined manner relative to the longitudinal axis of the rod, and whose inner 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. Dispositif selon la revendication 1, caractérisé en ce que le couteau est constitué de dents (100) indépendantes montées sur une barre de support transversale inclinée (110) par rapport au plan du tissu et rendue solidaire de l'organe de maintien (55).Device according to claim 1, characterized in that the knife consists of independent teeth (100) mounted on a transverse support bar inclined (110) relative to the plane of the fabric and made integral with the holding member (55). Dispositif selon la revendication 3 ou 4, caractérisé en ce que le couteau est réalisé en deux parties séparées symétriques par rapport à l'axe longitudinal du tissu.Device according to claim 3 or 4, characterized in that the knife is produced in two separate symmetrical parts with respect to the longitudinal axis of the fabric. Dispositif selon la revendication 4, caractérisé en ce que lesdites dents (100) comportent une première partie inclinée (101) pour la fixation sur la barre de support (110) et une deuxième partie (102) s'étendant parallèlement au plan du tissu et comportant un bord tranchant pour la coupe et une extrémité arrondie (103) pour la capture du fil.Device according to Claim 4, characterized in that the said teeth (100) comprise a first inclined part (101) for fixing to the support bar (110) and a second part (102) extending parallel to the plane of the fabric and having a sharp edge for cutting and a rounded end (103) for catching the wire. Dispositif selon la revendication 3, 4 ou 5, caractérisé en ce que lesdites dents sont réparties en deux séries symétriques par rapport au centre du couteau en étant orientées vers la lisière du tissu pour éviter que cette dernière ne soit détériorée lors du déplacement transversal relatif par rapport au tissu.Device according to claim 3, 4 or 5, characterized in that said teeth are distributed in two symmetrical series with respect to the center of the knife while being oriented towards the edge of the fabric to prevent the latter from being deteriorated during the relative transverse displacement by relationship to the fabric. Dispositif selon l'une des revendications précédentes, caractérisé en ce que ledit couteau est au moins partiellement intégré dans l'épaisseur de l'organe de maintien et/ou de la plaque inférieure perforée pour ne pas gêner les déplacements relatifs du tissu.Device according to one of the preceding claims, characterized in that said knife is at least partially integrated into the thickness of the holding member and / or of the perforated lower plate so as not to hinder the relative movements of the fabric. Dispositif selon l'une des revendication 3 à 8, caractérisé en ce que les extrémités des dents sont recourbées pour appuyer sur le tissu afin de sectionner les fils résiduels au ras des points d'arrêt.Device according to one of claims 3 to 8, characterized in that the ends of the teeth are curved to press on the tissue in order to cut the residual threads flush with the stopping points. Procédé de coupe des fils résiduels des coutures réalisées au moyen d'une machine à coudre multi-aiguilles à navettes ou crochets comprenant le déplacement relatif du tissu par rapport aux aiguilles et aux navettes pour étirer une certaine longueur de fil d'une part entre les points d'arrêt des coutures et les aiguilles et d'autre part entre lesdits points d'arrêt et les navettes ou crochets puis la coupe des fils résiduels, caractérisé en ce qu'on coupe simultanément tous les fils résiduels d'une même face du tissu au ras des points d'arrêt, en déplaçant au moins un couteau relativement à chacune desdites faces.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 to stretch a certain length of thread on the one hand between the stitches of the seams and the needles and on the other hand between the said stitches and the shuttles or hooks then the cutting of the residual threads, characterized in that all the residual threads of the same face of the same are cut simultaneously fabric flush with the stopping points, by moving at least one knife relative to each of said faces. Procédé de coupe conforme à la revendication 10, caractérisé en ce qu'on effectue un déplacement latéral du couteau par rapport au tissu en le maintenant en contact d'appui au niveau de ses parties tranchantes.Cutting method according to claim 10, characterized in that a lateral movement of the knife is made relative to the fabric while keeping it in contact with support at the level of its cutting parts. Procédé de coupe conforme à la revendication 10, caractérisé en ce qu'on effectue un déplacement alternatif longitudinal du couteau par rapport au tissu en le maintenant en contact d'appui au niveau de ses parties tranchantes.Cutting method according to claim 10, characterized in that one carries out a reciprocating longitudinal displacement of the knife with respect to the fabric while maintaining it in bearing contact at the level of its cutting parts. Procédé de coupe selon la revendication 10, caractérisé en ce qu'on effectue un déplacement latéral du tissu par rapport au couteaux.Cutting method according to claim 10, characterized in that a lateral movement of the fabric is carried out relative to the knives.
EP91402075A 1990-07-26 1991-07-25 Thread cutting device for multi-needle sewing machine Withdrawn EP0468892A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009580 1990-07-26
FR9009580A FR2665192B1 (en) 1990-07-26 1990-07-26 WIRE CUTTING DEVICE FOR MULTI-NEEDLE SEWING MACHINES.

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EP0468892A1 true EP0468892A1 (en) 1992-01-29

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Cited By (3)

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DE4202891A1 (en) * 1991-11-08 1993-05-19 Saurer Sticksysteme Ag THREAD CLAMPING AND CUTTING DEVICE FOR THE REAR OR UNDER THREAD OF AN EMBROIDERY MACHINE
DE4300846A1 (en) * 1993-01-15 1994-07-21 Saurer Sticksysteme Ag Arbon Cutting and clamping device for front thread for embroidery machines
EP0666352A1 (en) * 1994-02-05 1995-08-09 Saurer Sticksysteme Ag Method for resuming embroidering of needle- and shuttle thread in an embroidery machine

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JP6560913B2 (en) * 2015-06-26 2019-08-14 Juki株式会社 sewing machine

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US2376417A (en) * 1944-06-13 1945-05-22 Chudner Joseph Thread cutter
DE3023159A1 (en) * 1979-06-29 1981-01-08 August Heinzle EMBROIDERY MACHINE

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US2376417A (en) * 1944-06-13 1945-05-22 Chudner Joseph Thread cutter
DE3023159A1 (en) * 1979-06-29 1981-01-08 August Heinzle EMBROIDERY MACHINE

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202891A1 (en) * 1991-11-08 1993-05-19 Saurer Sticksysteme Ag THREAD CLAMPING AND CUTTING DEVICE FOR THE REAR OR UNDER THREAD OF AN EMBROIDERY MACHINE
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 (en) * 1993-01-15 1994-07-21 Saurer Sticksysteme Ag Arbon Cutting and clamping device for front thread for embroidery machines
US5477793A (en) * 1993-01-15 1995-12-26 Sauer Sticksysteme Ag Cutting and nipping apparatus for the front yarn for embroidery machines
EP0666352A1 (en) * 1994-02-05 1995-08-09 Saurer Sticksysteme Ag Method for resuming embroidering of needle- and shuttle thread in an embroidery machine

Also Published As

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

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