EP0501927B1 - Procedure for varying the curvature of the toe-end of hoses sewn with a toe-end sewing machine and device for realizing the said procedure - Google Patents

Procedure for varying the curvature of the toe-end of hoses sewn with a toe-end sewing machine and device for realizing the said procedure Download PDF

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Publication number
EP0501927B1
EP0501927B1 EP92830054A EP92830054A EP0501927B1 EP 0501927 B1 EP0501927 B1 EP 0501927B1 EP 92830054 A EP92830054 A EP 92830054A EP 92830054 A EP92830054 A EP 92830054A EP 0501927 B1 EP0501927 B1 EP 0501927B1
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EP
European Patent Office
Prior art keywords
stocking
toe
sewing
pliers
grasping
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EP92830054A
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German (de)
French (fr)
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EP0501927A1 (en
Inventor
Vinicio Gazzarrini
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Solis SRL
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Solis SRL
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B23/00—Sewing apparatus or machines not otherwise provided for
    • D05B23/007—Sewing units for assembling parts of knitted panties or closing the stocking toe part
    • D05B23/009—Toe closers

Definitions

  • the present invention relates to a method for varying the curvature of the stitch sewn from the bottom with a sewing machine and the device for its implementation.
  • stitching machines for hosiery and tights comprise a carousel with several tubular arms having the function of supporting and turning the hosiery, in which each tube is provided with two longitudinally sliding fins for transferring the bottom point beyond the end of the tube onto a horizontal disc rotating around its vertical axis, in a predetermined position relative to a cutting and sewing machine.
  • This disc is associated with a tray located above and slaved to an alternating vertical movement which has the function of holding in place, during sewing, the bottom point on the rotating disc located below in front of the needle. the cutting and sewing machine.
  • this support and blocking device at the bottom during sewing has the drawback that the arc of curvature of the seam made by the sewing machine is directly linked to the radius of the disc and that consequently the variation in the curvature of the sewn toe is only possible by replacing the disc, resulting in a waste of time which is incompatible with the production requirements of stockings or tights.
  • the aim of the present invention is to eliminate this drawback by proposing a method and a device which make it possible to vary the curvature of the sewn point at will without replacing the rotating support from the bottom, but by a simple and rapid operation of selection and / or for adjusting the tip tension means.
  • the advantages obtained thanks to the present invention consist essentially in the fact that it is possible to permanently modify the curvature of the sewn tip, in the direction of increasing or respectively decreasing its radius of curvature relative to that of the plane sewing turn; that the direction of the arc of curvature as well as the amplitude of the variation thereof can be easily adjusted, in very wide intervals, thanks to the selection and adjustment of the stroke of the bottom tip gripping means without requiring any replacement of the components of the stitch sewing machine.
  • FIG. 1 shows a schematic view from above of a device for varying the curvature of the stitch sewn from the bottom by means of a machine for sewing the stitches according to the invention, in the position making it possible to obtain a curvature normal, i.e. as in FIG. 1A;
  • FIG. 2 shows the device of FIG. 1, in the position allowing a reduction in the curvature to be obtained, that is to say as in FIG. 2A;
  • FIG. 3 shows the device of FIG.
  • FIG. 4 shows the side view of the device of FIG. 1, in the position with the gripping means of the tip open;
  • FIG. 5 shows the device of FIG. 4, in the rest position and with the gripping means closed;
  • FIG. 6 shows the top view of the device of FIG. 1, with the remote lateral gripping means;
  • FIG. 7 shows the side view of the device of FIG. 6;
  • FIG. 8 shows the front view of the device of FIG. 6;
  • FIG. 9 shows the top view of the device of FIG. 1, with the central gripping means moved back;
  • FIG. 10 shows the side view of the device of FIG. 9;
  • FIG. 11 shows the front view of the device of FIG. 9;
  • FIG. 12 shows the top view of a variant of the device of FIG. 1 according to the invention, in the rest position and with the gripping means open;
  • FIG. 13 shows the side view of the device of FIG. 12;
  • FIG. 14 shows the rear view of the device of FIG. 12;
  • the elastic deformation imposed on the fabric of the bottom point allows, after the elastic return of the sewn point, to obtain a variation in the final curvature of the seam compared to that obtained with the rotating seam plane, the value of which is proportional to the amplitude of the stroke imposed on the central zone 2 or respectively on the two lateral zones 21, before sewing.
  • FIGS. 1A to 3A The final result is illustrated in FIGS. 1A to 3A in which the double line 5 represents the beginning of the fabric of the point and line 6 represents the seam line; in particular, we note in FIG. 1A that no intervention was carried out on the point before sewing so that the seam line 6 obtained is of the traditional type, that is to say with a curvature which is determined by the radius of the rotating seam plane 4.
  • Fig. 2A it can be seen that the tension exerted on the central portion of the bottom tip relative to the lateral ones 21 before sewing 6 causes, after sewing, a seam line whose curvature has a greater radius than that of the Fig. 1A.
  • Fig. 3A it is noted that the tension exerted, before sewing, on the lateral portions 21 relative to the central portion 20 of the bottom 2 does not enter, after sewing, a seam line whose curvature has a radius smaller than that of Fig. 1A.
  • the pliers 14,16 are open and in the advanced position, that is to say as close as possible to the seam plane, and the bottom is on the turning tube with the sewing point protruding from that -this under the action of the fins of the turning tube which are in the advanced position so that the bottom point is on the stitching plane of the sewing machine and with the free end in the open mouth of the three pliers 14.16; then, depending on the desired curvature of the stitch sewn, the central clamp 14 or external clamps 16 are closed and, successively, the corresponding cylinder 21 or 22 is actuated so as to obtain the recoil of the central clamp 14 or of the lateral ones, which makes it possible to obtain the elastic tension of the central part or respectively of the lateral parts of the bottom tip.
  • the plate which is located above the rotating seam plane is actuated to descend and lock the bottom point thus stretched on the seam plane placed below.
  • the pliers or pliers which carried out the tension at the bottom are deactivated, that is to say open, and the sewing is carried out in the traditional way, that is to say by turning in front of the needle of the sewing machine the turning seam plane and the plate with the interposed bottom.
  • the plate is deactivated and this one, going up, releases the sewn stocking; simultaneously, the cylinder 21 or 22 which is in the position of maximum recoil of the pliers or pliers is actuated so as to bring the pliers that are already open in the position of start of cycle.

Description

La présente invention concerne un procédé pour varier la courbure de la pointe cousue des bas avec une machine à coudre les pointes et un dispositif pour sa mise en oeuvre.The present invention relates to a method for varying the curvature of the stitch sewn from the bottom with a sewing machine and the device for its implementation.

Il est connu que les machines à coudre les pointes pour bas et collants (voir par exemple EP-A-204 058) comprennent un carrousel avec plusieurs bras tubulaires ayant pour fonction de supporter et de retourner les bas, dans laquelle chaque tube est muni de deux ailettes coulissantes longitudinalement pour transférer la pointe du bas au-delà de l'extrémité du tube sur un disque horizontal tournant autour de son axe vertical, dans une position prédéterminée par rapport à une machine à couper et à coudre. Ce disque est associé à un plateau situé au-dessus et asservi à un mouvement vertical alternatif qui a pour fonction de maintenir en place, pendant la couture, la pointe du bas sur le disque tournant situé au-dessous en face de l'aiguille de la machine à couper et à coudre. Mais ce dispositif de support et de blocage du bas pendant la couture présente l'inconvénient dû au fait que l'arc de courbure de la couture effectuée par la machine à coudre est directement lié au rayon du disque et que par conséquent la variation de la courbure de la pointe cousue n'est possible qu'en remplaçant le disque, ce qui entraîne une perte de temps qui est incompatible avec les exigences de production des bas ou des collants.It is known that stitching machines for hosiery and tights (see for example EP-A-204 058) comprise a carousel with several tubular arms having the function of supporting and turning the hosiery, in which each tube is provided with two longitudinally sliding fins for transferring the bottom point beyond the end of the tube onto a horizontal disc rotating around its vertical axis, in a predetermined position relative to a cutting and sewing machine. This disc is associated with a tray located above and slaved to an alternating vertical movement which has the function of holding in place, during sewing, the bottom point on the rotating disc located below in front of the needle. the cutting and sewing machine. However, this support and blocking device at the bottom during sewing has the drawback that the arc of curvature of the seam made by the sewing machine is directly linked to the radius of the disc and that consequently the variation in the curvature of the sewn toe is only possible by replacing the disc, resulting in a waste of time which is incompatible with the production requirements of stockings or tights.

La présente invention a pour but d'éliminer cet inconvénient en proposant un procédé et un dispositif qui permettent de varier à volonté la courbure de la pointe cousue sans remplacer le support tournant du bas, mais par une opération simple et rapide de sélection et/ou de réglage de moyens de tension de la pointe.The aim of the present invention is to eliminate this drawback by proposing a method and a device which make it possible to vary the curvature of the sewn point at will without replacing the rotating support from the bottom, but by a simple and rapid operation of selection and / or for adjusting the tip tension means.

Ce résultat a été atteint conformément à l'invention en adoptant l'idée d'utiliser un procédé de traitement qui prévoit, après le positionnement de la pointe du bas en position de couture sur le disque tournant correspondant, de saisir l'extrémité libre du bas, au centre ou sur les côtés, en dehors et au-delà dudit disque et de tendre élastiquement en direction de la machine à coudre la zone centrale par rapport à celles latérales ou inversément les zones latérales par rapport à celle centrale; d'abaisser ensuite le plateau situé au-dessus du disque et de bloquer la pointe du bas ainsi tendue, puis de libérer l'extrémité libre du bas et d'effectuer la couture pour diminuer ou respectivement augmenter par rapport au rayon dudit disque le rayon de courbure de la pointe cousue sous l'effet du retour élastique naturel du tissu relatif à la pointe, à la suite du soulèvement du plateau après la couture.This result was achieved in accordance with the invention by adopting the idea of using a treatment method which, after positioning the bottom point in the sewing position on the corresponding rotating disc, to grasp the free end of the bottom, center or sides, outside and beyond said disc and to stretch elastically in the direction of the sewing machine the central zone relative to the lateral ones or vice versa the lateral zones relative to the central one; then lower the tray located above the disc and block the bottom point thus stretched, then release the free end of the bottom and sew to decrease or respectively increase relative to the radius of said disc the radius of curvature of the stitch sewn under the effect of the natural elastic return of the fabric relative to the tip, following the lifting of the plate after sewing.

Et un dispositif pour mettre en oeuvre ledit procédé conformément à l'invention, comprend:

  • des moyens pour saisir en plusieurs points, séparément, l'extrémité libre de la pointe aplatie à coudre du bas et qui fait saillie au-delà du plan tournant de couture;
  • des moyens pour activer et respectivement désactiver lesdits moyens de prise du bas;
  • des moyens pour imprimer auxdits moyens de prise du bas un mouvement aller rectiligne dans la direction longitudinale du bas dans le sens de l'éloignement par rapport au plan tournant de couture pour obtenir une mise en tension, c'est-à-dire un allongement élastique du tissu de la pointe du bas qui a été saisie par les moyens de prise et, respectivement, dans le sens du rapprochement par rapport au plan tournant de couture pour obtenir le mouvement rectiligne de retour dans la position initiale des moyens de prise du bas après avoir relâché la prise du bas;
  • des moyens pour synchroniser les interventions des moyens de prise du bas avec celles du plateau de blocage du bas sur le plan de couture.
And a device for implementing said method in accordance with the invention, comprises:
  • means for grasping at several points, separately, the free end of the flattened sewing tip from the bottom and which projects beyond the rotating seam plane;
  • means for activating and deactivating respectively said bottom gripping means;
  • means for imparting to said bottom gripping means a rectilinear forward movement in the longitudinal direction of the bottom in the direction of the distance from the rotating seam plane to obtain a tensioning, that is to say an elongation elastic of the fabric of the bottom tip which has been grasped by the gripping means and, respectively, in the direction of approximation with respect to the rotating seam plane to obtain the rectilinear movement back in the initial position of the bottom gripping means after releasing the bottom plug;
  • means for synchronizing the interventions of the bottom gripping means with those of the bottom blocking plate on the seam plane.

Les avantages obtenus grâce à la présente invention consistent essentiellement dans le fait qu'il est possible de modifier de manière permanente la courbure de la pointe cousue, dans le sens d'augmenter ou respectivement de diminuer son rayon de courbure par rapport à celui du plan tournant de couture; que le sens de l'arc de courbure tout comme l'amplitude de la variation de celle-ci peuvent être facilement réglés, dans des intervalles très larges, grâce à la sélection et au réglage de la course des moyens de prise de la pointe du bas sans nécessiter aucun remplacement des composants de la machine à coudre les pointes.The advantages obtained thanks to the present invention consist essentially in the fact that it is possible to permanently modify the curvature of the sewn tip, in the direction of increasing or respectively decreasing its radius of curvature relative to that of the plane sewing turn; that the direction of the arc of curvature as well as the amplitude of the variation thereof can be easily adjusted, in very wide intervals, thanks to the selection and adjustment of the stroke of the bottom tip gripping means without requiring any replacement of the components of the stitch sewing machine.

Ces avantages et caractéristiques de l'invention ainsi que d'autres seront plus et mieux compris de chaque homme du métier à la lumière de la description qui va suivre et à l'aide des dessins annexés donnés à titre d'exemplification pratique de l'invention, mais à ne pas considérer dans le sens limitatif; dessins sur lesquels la FIG. 1 représente une vue schématique d'en haut d'un dispositif pour varier la courbure de la pointe cousue d'un bas au moyen d'une machine à coudre les pointes conformément à l'invention, dans la position permettant d'obtenir une courbure normale, c'est-à-dire comme sur la FIG. 1A; la FIG. 2 représente le dispositif de la Fig. 1, dans la position permettant d'obtenir une diminution de la courbure, c'est-à-dire comme sur la FIG. 2A; la FIG. 3 représente le dispositif de la Fig. 1, dans la position permettant d'obtenir une augmentation de la courbure, c'est-à-dire comme sur la FIG. 3A; la FIG. 4 représente la vue de côté du dispositif de la Fig. 1, dans la position avec les moyens de prise de la pointe ouverts; la FIG. 5 représente le dispositif de la Fig. 4, dans la position de repos et avec les moyens de prise fermés; la FIG. 6 représente la vue d'en haut du dispositif de la Fig. 1, avec les moyens de prise latéraux reculés; la FIG. 7 représente la vue de côté du dispositif de la Fig. 6; la FIG. 8 représente la vue de face du dispositif de la Fig. 6; la FIG. 9 représente la vue d'en haut du dispositif de la Fig. 1, avec les moyens de prise centraux reculés; la FIG. 10 représente la vue de côté du dispositif de la Fig. 9; la FIG. 11 représente la vue de face du dispositif de la Fig. 9; la FIG. 12 représente la vue d'en haut d'une variante du dispositif de la Fig. 1 conformément à l'invention, dans la position de repos et avec les moyens de prise de la pointe ouverts; la FIG. 13 représente la vue de côté du dispositif de la Fig. 12; la FIG. 14 représente la vue de derrière du dispositif de la Fig. 12;These advantages and characteristics of the invention as well as others will be more and better understood by each person skilled in the art in the light of the description which will follow and with the aid of the appended drawings given by way of practical example of the invention, but not to be considered in the limiting sense; drawings in which FIG. 1 shows a schematic view from above of a device for varying the curvature of the stitch sewn from the bottom by means of a machine for sewing the stitches according to the invention, in the position making it possible to obtain a curvature normal, i.e. as in FIG. 1A; FIG. 2 shows the device of FIG. 1, in the position allowing a reduction in the curvature to be obtained, that is to say as in FIG. 2A; FIG. 3 shows the device of FIG. 1, in the position allowing an increase in the curvature to be obtained, that is to say as in FIG. 3A; FIG. 4 shows the side view of the device of FIG. 1, in the position with the gripping means of the tip open; FIG. 5 shows the device of FIG. 4, in the rest position and with the gripping means closed; FIG. 6 shows the top view of the device of FIG. 1, with the remote lateral gripping means; FIG. 7 shows the side view of the device of FIG. 6; FIG. 8 shows the front view of the device of FIG. 6; FIG. 9 shows the top view of the device of FIG. 1, with the central gripping means moved back; FIG. 10 shows the side view of the device of FIG. 9; FIG. 11 shows the front view of the device of FIG. 9; FIG. 12 shows the top view of a variant of the device of FIG. 1 according to the invention, in the rest position and with the gripping means open; FIG. 13 shows the side view of the device of FIG. 12; FIG. 14 shows the rear view of the device of FIG. 12;

Réduit à sa structure essentielle et en référence aux Fig. 1 à 3 des dessins annexés, le procédé selon l'invention pour modifier la courbure de la pointe cousue 1 d'un bas 2 par rapport à celle qu'il est possible d'obtenir avec le plan tournant de couture d'une machine à coudre les pointes pour bas ou pour collants avec au moins une station de couture, dans laquelle le bas est enfilé sur un tube de retournement 3 pneumatique avec ailettes coulissantes 30, prévoit, dans ladite station de couture et après que lesdites ailettes aient transféré l'extrémité à coudre du bas au-delà de l'extrémité du tube 3 jusqu'au-dessus du plan tournant de couture 4, de:

  • (a) saisir simultanément les portions 21 externes ou respectivement la portion centrale 20 de l'extrémité à coudre du bas 2 qui dépasse du plan tournant de couture 4;
  • (b) tendre élastiquement, c'est-à-dire allonger, la portion centrale par rapport à celles externes 21 du bas 2 ou bien les deux portions externes 21 par rapport à celle centrale 20 de manière que la portion centrale 20 dépasse les portions latérales 21 dans la direction de la machine à coudre ou respectivement que les portions externes 21 dépassent celle centrale 20, selon qu'on désire obtenir une augmentation ou respectivement une diminution du rayon de courbure de la pointe cousue par rapport à celui du plan tournant de couture;
  • (c) bloquer la pointe du bas 2 ainsi tendue, c'est-à-dire allongée élastiquement;
  • (d) effectuer la couture de la pointe du bas ainsi bloqué;
  • (e) relâcher la pointe du bas ainsi cousue.
Reduced to its essential structure and with reference to Figs. 1 to 3 of the accompanying drawings, the method according to the invention for modifying the curvature of the sewn toe 1 of a stocking 2 relative to that which can be obtained with the rotating seam plane of a sew the tips for stockings or for tights with at least one sewing station, in which the stocking is threaded on a pneumatic turning tube 3 with sliding fins 30, provides, in said sewing station and after said fins have transferred the end to be sewn from the bottom beyond the end of the tube 3 to above the rotating seam plane 4, from:
  • (a) simultaneously grasping the outer portions 21 or respectively the central portion 20 of the end to be sewn from the bottom 2 which protrudes from the rotating seam plane 4;
  • (b) stretch elastically, i.e. elongate, the central portion relative to the outer ones 21 at the bottom 2 or else the two outer portions 21 relative to the central one 20 so that the central portion 20 exceeds the lateral portions 21 in the direction of the sewing machine or respectively that the outer portions 21 exceed the central one 20, depending on whether one wishes to obtain an increase or respectively a decrease in the radius of curvature of the sewn tip relative to that of the rotating seam plane;
  • (c) blocking the bottom point 2 thus stretched, that is to say elastically elongated;
  • (d) sewing the bottom point thus blocked;
  • (e) release the bottom point thus sewn.

La déformation élastique imposée au tissu de la pointe du bas permet, après le retour élastique de la pointe cousue, d'obtenir une variation de la courbure finale de la couture par rapport à celle obtenue avec le plan tournant de couture, dont la valeur est proportionnelle à l'amplitude de la course imposée à la zone centrale 2 ou respectivement aux deux zones latérales 21, avant la couture.The elastic deformation imposed on the fabric of the bottom point allows, after the elastic return of the sewn point, to obtain a variation in the final curvature of the seam compared to that obtained with the rotating seam plane, the value of which is proportional to the amplitude of the stroke imposed on the central zone 2 or respectively on the two lateral zones 21, before sewing.

Le résultat final est illustré sur les figures 1A à 3A sur lesquelles la double ligne 5 représente le début du tissu de la pointe et la ligne 6 représente la ligne de couture; en particulier, on note sur la Fig. 1A qu'aucune intervention n'a été effectuée sur la pointe avant la couture de sorte que la ligne de couture 6 obtenue est de type traditionnel, c'est-à-dire avec une courbure qui est déterminée par le rayon du plan tournant 4 de couture. D'après la Fig. 2A, on remarque que la tension exercée sur la portion centrale de la pointe du bas par rapport à celles latérales 21 avant la couture 6 entraîne, après la couture, une ligne de couture dont la courbure présente un rayon supérieur par rapport à celle de la Fig. 1A.The final result is illustrated in FIGS. 1A to 3A in which the double line 5 represents the beginning of the fabric of the point and line 6 represents the seam line; in particular, we note in FIG. 1A that no intervention was carried out on the point before sewing so that the seam line 6 obtained is of the traditional type, that is to say with a curvature which is determined by the radius of the rotating seam plane 4. According to Fig. 2A, it can be seen that the tension exerted on the central portion of the bottom tip relative to the lateral ones 21 before sewing 6 causes, after sewing, a seam line whose curvature has a greater radius than that of the Fig. 1A.

D'après la Fig. 3A, on remarque que la tension exercée, avant la couture, sur les portions latérales 21 par rapport à la portion centrale 20 du bas 2 entra ne, après la couture, une ligne de couture dont la courbure présente un rayon inférieur par rapport à celle de la Fig. 1A.According to Fig. 3A, it is noted that the tension exerted, before sewing, on the lateral portions 21 relative to the central portion 20 of the bottom 2 does not enter, after sewing, a seam line whose curvature has a radius smaller than that of Fig. 1A.

En référence aux Fig. 4 à 11 des dessins annexés, un dispositif pour varier la courbure de la pointe cousue des bas pour la mise en oeuvre du procédé conformément à l'invention et comprenant un tube de retournement pneumatique 3 avec ailettes coulissantes 30 pour supporter un bas 2 et transférer la pointe à coudre au-dessus du plan tournant de couture 4 d'une machine à coudre les pointes (non représentée) et comprenant en outre un plateau situé au-dessus et de manière concentrique audit plan de couture et mobile verticalement par rapport à celui-ci pour bloquer et tourner la pointe du bas interposée durant la phase de couture, est constitué de:

  • un corps central fixe 10 avec deux goupilles transversales 11 coplanaires pour supporter et guider deux coulisseaux 12, 13 indépendants à fourche, l'un interne 12 et l'autre externe 13, avec les branches de même longueur et avec les bases décalées l'une par rapport à l'autre pour leur permettre alternativement de reculer horizontalement de manière coaxiale par rapport au tube de retournement situé en face et qui porte le bas: lesdites goupilles 11 remplissant également la fonction de fin de course des coulisseaux, respectivement en avant, c'est-à-dire en position de repos, et en arrière, c'est-à-dire en position d'activation;
  • une pince centrale 14 et deux pinces latérales 16 dont les pointes plates sont articulées à l'avant dudit coulisseau interne 12 et respectivement externe 13 avec interposition de biellettes correspondantes 15,17: les pivots des articulations 15A et 17A des trois pinces étant alignés entre eux lorsque les deux coulisseaux 12 et 13 se trouvent complètement en avant, pour permettre l'ouverture et respectivement la fermeture simultanée des pinces 14 et 16 qui sont du type à ciseau à commande pneumatique;
  • deux cylindres de commande pneumatique 21,22 parallèles et superposés, fixés à l'arrière dudit corps 10 et avec les tiges 23,24 reliées à l'arrière des coulisseaux 12,13 respectivement, et lesquels sont activés par une unité centrale pour faire reculer le coulisseau 13 portant les deux pinces latérales 16 ou le coulisseau 12 portant la pince centrale 14 après la fermeture des pointes correspondantes: l'activation/désactivation d'un ou des deux cylindres 21,22 étant déterminée au moyen d'un sélecteur approprié relié à l'unité centrale de commande de la machine à coudre les pointes en parallèle avec le cylindre de commande du mouvement vertical alternatif du plateau de blocage de la pointe à coudre du bas de manière à faire reculer ou respectivement avancer les pinces pendant que ledit plateau descend ou respectivement remonte.
With reference to Figs. 4 to 11 of the accompanying drawings, a device for varying the curvature of the sewn toe point for implementing the method according to the invention and comprising a pneumatic turning tube 3 with sliding fins 30 to support a stocking 2 and transfer the sewing spike above the rotating stitching plane 4 of a spike sewing machine (not shown) and further comprising a plate situated above and concentric with said seam plane and movable vertically relative to that -to block and turn the bottom point interposed during the sewing phase, consists of:
  • a fixed central body 10 with two pins transverse 11 coplanar to support and guide two independent sliders 12, 13 with fork, one internal 12 and the other external 13, with the branches of the same length and with the bases offset relative to each other for their alternately allow to backward horizontally coaxially with respect to the reversal tube located opposite and which carries the bottom: said pins 11 also fulfilling the end of travel function of the slides, respectively in front, that is to say in position at rest, and backwards, that is to say in the activation position;
  • a central clamp 14 and two lateral clamps 16 whose flat points are articulated at the front of said internal slide 12 and respectively external 13 with interposition of corresponding rods 15, 17: the pivots of the articulations 15A and 17A of the three clamps being aligned with one another when the two sliders 12 and 13 are completely forward, to allow the simultaneous opening and closing of the clamps 14 and 16 which are of the pneumatically operated scissor type;
  • two pneumatic control cylinders 21,22 parallel and superimposed, fixed to the rear of said body 10 and with the rods 23,24 connected to the rear of the sliders 12,13 respectively, and which are activated by a central unit for reversing the slide 13 carrying the two lateral clips 16 or the slide 12 carrying the central clip 14 after closing the spikes corresponding: the activation / deactivation of one or both cylinders 21,22 being determined by means of an appropriate selector connected to the central control unit of the sewing machine in parallel with the movement control cylinder vertical alternative of the blocking plate of the sewing tip from the bottom so as to make the pliers move back or advance respectively while said plate descends or respectively rises.

En référence aux Fig. 12 à 14 des dessins annexés, il est prévu, conformément à l'invention, de remplacer les coulisseaux 12,13 supportant les pinces 14,16 par deux paires de tiges horizontales coplanaires 30,31 correspondantes, montées coulissantes dans des orifices correspondants du corps 10, à une extrémité desquelles sont articulées lesdites biellettes 15,17 respectivement des pinces 14,16 et dont l'autre extrémité est fixée à une plaque correspondante avec profile en forme de C 34,35, avec la plaque 34 de largeur inférieure de manière à se trouver à l'intérieur de l'autre 35: les tiges 23,24 desdits cylindres 21,22 de commande du mouvement des tiges 30,31 étant fixées au centre de la plaque 34,35 correspondante et deux paires de vis 38,39 disposées de part et d'autre de la tige 23,24 du cylindre correspondant 21,22 étant prévues pour permettre de régler le point d'arrêt des plaques 34,35 durant la course de recul des pinces 14,16 et donc de varier la tension élastique du tissu de la pointe du bas et par conséquent de varier le rayon de courbure de la couture de la pointe.With reference to Figs. 12 to 14 of the appended drawings, it is planned, in accordance with the invention, to replace the slides 12,13 supporting the clamps 14,16 by two pairs of corresponding horizontal coplanar rods 30,31, mounted sliding in corresponding holes in the body 10, at one end of which said link rods 15,17 are respectively pliers 14,16 and the other end of which is fixed to a corresponding plate with C-shaped profile 34,35, with the plate 34 of smaller width so to be inside the other 35: the rods 23,24 of said cylinders 21,22 for controlling the movement of the rods 30,31 being fixed to the center of the corresponding plate 34,35 and two pairs of screws 38, 39 arranged on either side of the rod 23.24 of the corresponding cylinder 21.22 being provided to allow the stop point of the plates 34.35 to be adjusted during the recoil stroke of the clamps 14.16 and therefore to vary the elastic tension of the fabric u from the bottom tip and therefore vary the radius of curvature of the stitching of the tip.

Le fonctionnement est le suivant. Au début du cycle, les pinces 14,16 sont ouvertes et en position avancée, c'est-à-dire rapprochées au maximum du plan de couture, et le bas se trouve sur le tube de retournement avec la pointe à coudre dépassant de celui-ci sous l'action des ailettes du tube de retournement qui se sont en position avancée de manière que la pointe du bas se trouve sur le plan de couture de la machine à coudre les pointes et avec l'extrémité libre dans la bouche ouverte des trois pinces 14,16; ensuite, en fonction de la courbure désirée de la pointe cousue, on déclenche la fermeture de la pince centrale 14 ou des pinces externes 16 et, successivement, le cylindre correspondant 21 ou 22 est actionné de manière à obtenir le recul de la pince centrale 14 ou de celles latérales, ce qui permet d'obtenir la tension élastique de la partie centrale ou respectivement des parties latérales de la pointe du bas. En fin de course de la pince ou des pinces, le plateau qui se trouve au-dessus du plan tournant de couture est actionné pour descendre et bloquer la pointe du bas ainsi tendue sur le plan de couture placé au-dessous. Ensuite, la pince ou les pinces qui ont effectué la tension du bas sont désactivées, c'est-à-dire ouvertes, et la couture s'effectue de manière traditionnelle, c'est-à-dire en faisant tourner devant l'aiguille de la machine à coudre le plan tournant de couture et le plateau avec le bas interposé. Une fois la couture terminée, le plateau est désactivé et celui-ci, en remontant, libère le bas cousu; simultanément, le cylindre 21 ou 22 qui se trouve dans la position de recul maximum de la pince ou des pinces est actionné de manière à ramener la ou les pinces qui sont déjà ouvertes dans la position de début de cycle.The operation is as follows. At the start of the cycle, the pliers 14,16 are open and in the advanced position, that is to say as close as possible to the seam plane, and the bottom is on the turning tube with the sewing point protruding from that -this under the action of the fins of the turning tube which are in the advanced position so that the bottom point is on the stitching plane of the sewing machine and with the free end in the open mouth of the three pliers 14.16; then, depending on the desired curvature of the stitch sewn, the central clamp 14 or external clamps 16 are closed and, successively, the corresponding cylinder 21 or 22 is actuated so as to obtain the recoil of the central clamp 14 or of the lateral ones, which makes it possible to obtain the elastic tension of the central part or respectively of the lateral parts of the bottom tip. At the end of the pliers or pliers' stroke, the plate which is located above the rotating seam plane is actuated to descend and lock the bottom point thus stretched on the seam plane placed below. Then, the pliers or pliers which carried out the tension at the bottom are deactivated, that is to say open, and the sewing is carried out in the traditional way, that is to say by turning in front of the needle of the sewing machine the turning seam plane and the plate with the interposed bottom. Once the sewing finished, the plate is deactivated and this one, going up, releases the sewn stocking; simultaneously, the cylinder 21 or 22 which is in the position of maximum recoil of the pliers or pliers is actuated so as to bring the pliers that are already open in the position of start of cycle.

Claims (9)

  1. Process for varying the curvature of sewn toes of stockings with a machine for sewing the toes, consisting of means for supporting the stocking and for positioning the toe in a flat position on a circular plane turning corresponding to the sewing station, characterized in that it contains the following operations in succession:
    (a) grasping the free end of the stocking at the centre or at the sides, outside or beyond the said rotating sewing plane, in the direction of the sewing machine,
    (b) tightening the central zone of the flat toe elastically in the longitudinal direction of the stocking and grasping it relative to the external zones or conversely tightening the two external zones relative to the central zone, according to whether one wants to obtain a curvilinear sewn radius greater or less than the radius of the rotating sewing plane,
    (c) fixing the flat toe of the stocking on the rotating sewing plane and tightening it elastically,
    (d) freeing the free end of the stocking toe fixed in this way,
    (e) carrying out the progressive sewing by turning the sewing plane and simultaneously cutting the excess material relative to the line of cutting,
    (f) releasing the stocking toe sewn in this way.
  2. Process according to claim 1, characterized in that the said elastic tension can be controlled as a function of the elastic extension imposed at the stocking toe to be sewn.
  3. Arrangement for varying the curvature of the stocking toe sewn with a sewing machine according to the process of the preceding claims, characterized in that, corresponding to a horizontal circular plane (4) rotating with a coaxial plate situated below, with vertical and rotating movement, for tightening the toe during sewing, it contains:
    - means (14, 16) of grasping at several separate points the free end of the flat stocking toe to be sewn and which goes outside the rotating sewing plane,
    - pneumatic means for activating and de-activating respectively the said means (14, 16) for grasping the stockings,
    - means for imposing on the said means (14, 16) for grasping the stockings a rectilinear movement in the longitudinal direction of the stocking in the sense of lengthening it relative to the sewing plane to obtain a tension, ie: elastic expansion of the material of the stocking toe which has been grasped by the means of grasping (14, 16) and respectively in the sense of coming closer relative to the rotating sewing plane to obtain a rectilinear return movement to the initial position of the means of grasping the stocking, after releasing the grasp of the stocking,
    - means for synchronising the actions of the means of grasping the stocking with those of the said plate of the sewing machine of the toes.
  4. Device according to claim 3, characterized in that the said means (14, 16) for grasping the stocking consist of pliers (14) with flat points and a pair of pliers (16) with flat points with scissors opening and pneumatic control, acting frontally in the central zone and respectively in the two external zone of the free end of the flat toe of the stocking: the points of the said pliers (14, 16) being articulated in front of a corresponding slide (12, 13) with horizontal alternating movement with interposition of two corresponding connecting rods (15, 17).
  5. Device according to claim 3, characterized in that the said means of moving the pliers (14, 16) grasping the stocking consist of two double-acting pneumatic cylinders (21, 22) with the respective rods (23, 24) connected to the rear part of a corresponding slide (12, 13) and which are actuated separately by a central unit of the machine sewing the toes to actuate the central pliers (14) or the pair of external pliers (16) respectively.
  6. Device according to claim 5, characterized in that the said cylinders (21, 22) for moving the pliers (14, 16) are selected by means of a selector connected in parallel with the control of the pneumatic cylinder which controls the blocking plate of the stocking toe on the rotating sewing plane (4).
  7. Device according to claim 4, characterized in that the said slides (12, 13) supporting the pliers (14, 16) are produced from a sheet bent into a U shape, one internal slide (12) and one external one (13), with arms of the same length and with the bases offset to enable them to be fixed to the rod of the corresponding control cylinder (21, 22).
  8. Device according to claim 3, characterized in that the said means of moving the pliers (14, 16) consist of two pairs of coplanar rods (30, 31), at the front of the said connecting rods (15, 17) are articulated, and whose rear end is fixed on the corresponding control cylinder (21, 22) with a corresponding plate (34, 35) interposed.
  9. Device according to claims 5 and 8, characterized in that it includes two pairs of screws (38, 39) mounted on each side relative to the control cylinders (21, 22) and which form stops for the said plates (34, 35) to enable one to control the course, ie: toe backward movement of the pliers (14, 16).
EP92830054A 1991-02-26 1992-02-05 Procedure for varying the curvature of the toe-end of hoses sewn with a toe-end sewing machine and device for realizing the said procedure Expired - Lifetime EP0501927B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI910039A IT1246679B (en) 1991-02-26 1991-02-26 METHOD FOR CHANGING THE CURVATURE OF THE STITCHED TOE OF STOCKINGS WITH A STITCHING MACHINE AND DEVICE FOR IMPLEMENTING THE SAID METHOD.
ITFI910039 1991-02-26

Publications (2)

Publication Number Publication Date
EP0501927A1 EP0501927A1 (en) 1992-09-02
EP0501927B1 true EP0501927B1 (en) 1995-07-26

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EP92830054A Expired - Lifetime EP0501927B1 (en) 1991-02-26 1992-02-05 Procedure for varying the curvature of the toe-end of hoses sewn with a toe-end sewing machine and device for realizing the said procedure

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Country Link
US (1) US5207165A (en)
EP (1) EP0501927B1 (en)
JP (1) JPH06198089A (en)
CA (1) CA2061776A1 (en)
DE (1) DE69203625T2 (en)
IT (1) IT1246679B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1286598B1 (en) * 1996-04-16 1998-07-15 Solis Srl DEVICE FOR SEWING THE TOE OF KNITTED TUBULAR PRODUCTS
IT1316339B1 (en) * 2000-02-04 2003-04-10 Guerrino Rumi EQUIPMENT AND PROCEDURE FOR AUTOMATIC FEEDING A STITCHER'S STITCHER
US6779472B1 (en) 2003-03-25 2004-08-24 Sara Lee Corporation Hosiery toe closing apparatus and method
ITFI20040259A1 (en) * 2004-12-10 2005-03-10 Golden Lady Co Spa DEVICE AND METHOD TO MANIPULATE KNITTED TUBULAR ITEMS AS SOCKS OR SIMILAR TO PERFORM THE SEWING OF THE TIP
ITMI20042084A1 (en) * 2004-11-02 2005-02-02 Cesare Colosio S P A AUTOMATIC SEWING DEVICE PARTICULARLY FOR SOCKS FOR SOCKS

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1545731A (en) * 1967-06-14 1968-11-15 Nittex Ag Improvement in devices for closing the point of stockings or other similar articles
GB1542827A (en) * 1976-10-26 1979-03-28 Takatori Machinery Works Ltd Automatic method and apparatus for closing a toe end of a hose utilizing a straight line stitch
JPS5431063A (en) * 1977-08-11 1979-03-07 Sanwa Tekki Corp Metal plate brazing
JPS5831953B2 (en) * 1979-01-30 1983-07-09 株式会社タカトリ機械製作所 Method and device for closing the toe of a hose
US4444140A (en) * 1981-12-14 1984-04-24 Monarch Knitting Machinery Corporation Method of making panty hose and apparatus to make same
DE3567490D1 (en) * 1985-05-24 1989-02-16 Solis Srl Process and apparatus for automatically positioning the toe end of a stocking at the open end of an everting tube for sewing purposes
GB8730199D0 (en) * 1987-12-24 1988-02-03 Detexomat Machinery Ltd Hosiery toe closing method & apparatus
US5040475A (en) * 1989-01-28 1991-08-20 Sara Lee Corporation Material handling system

Also Published As

Publication number Publication date
ITFI910039A1 (en) 1992-08-26
DE69203625T2 (en) 1996-04-18
US5207165A (en) 1993-05-04
CA2061776A1 (en) 1992-08-27
DE69203625D1 (en) 1995-08-31
EP0501927A1 (en) 1992-09-02
JPH06198089A (en) 1994-07-19
IT1246679B (en) 1994-11-24
ITFI910039A0 (en) 1991-02-26

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