EP0753613B1 - Device for continuously inserting a core in a sliver - Google Patents

Device for continuously inserting a core in a sliver Download PDF

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Publication number
EP0753613B1
EP0753613B1 EP19960440055 EP96440055A EP0753613B1 EP 0753613 B1 EP0753613 B1 EP 0753613B1 EP 19960440055 EP19960440055 EP 19960440055 EP 96440055 A EP96440055 A EP 96440055A EP 0753613 B1 EP0753613 B1 EP 0753613B1
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EP
European Patent Office
Prior art keywords
draw
roll
drawing line
core thread
core
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EP19960440055
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German (de)
French (fr)
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EP0753613A1 (en
Inventor
Jean-François Ferdinand
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Nouvelle D'applications Mecaniques Et Optiques Snamo SA Ste
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Nouvelle D'applications Mecaniques Et Optiques Snamo SA Ste
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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
    • D02G3/324—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic using a drawing frame

Definitions

  • the present invention relates to a device for the continuous insertion of a elastic core thread in a wick of fibers for a spinning machine, so to make a wire commonly called “core spun”, comprising a cylinder deliverer bringing together the wick of fibers and the core thread, means for unwinding a coil of core wire resting on two support shafts parallel axes, driven in the same direction of rotation and supporting said coil, and a core wire return roller disposed between the means of unwinding and the delivery cylinder.
  • the manufacturing process relating to the insertion of an elastic core wire into a wick of fibers in a spinning machine is well known and allows the making a cotton thread or another material, commonly called "core spun", having elastic properties, in particular for the manufacture of knitted textiles such as t-shirts, underwear, etc, and textile articles in warp and weft.
  • Good quality means a thread product which exhibits, on the one hand, homogeneous elastic characteristics so a percentage of elongation equivalent to different points the along this wire and, on the other hand, a regular external appearance, without overshoot core wire at the outer periphery of said finished wire.
  • a product thread whose homogeneous elastic characteristics makes it possible to obtain a product knitted or woven with a regular appearance. Otherwise, the differences of elasticity create tighter stitches than others. What can cause chevrons in the woven or knitted product.
  • a product thread of which the external appearance is regular allows to obtain a knitted or woven product of uniform color.
  • the core thread appears at the periphery of the finished yarn, it gives rise to differences in coloring given that it does not have the same dye characteristics as those of the wick, being of a different nature. These color differences can generate darker or lighter spots or traces on the woven product or knitted.
  • the core wire deflection roller is located near the delivery cylinder on which the core thread is inserted into the fiber wick. It turns out that during the strand of fibers does not keep a constant position on the delivery cylinder. On the contrary, this position oscillates on both sides from a central point randomly. Therefore, the point of encounter between the core thread and the wick of fibers is not constant. If the return roller of the core wire is too close to the delivery cylinder, the wire soul does not have enough freedom to follow the movement of the wick on said delivery cylinder. This results in positioning faults in the core wire relative to the center of the wick of fibers.
  • the known devices generally only have one drawing train between the point of unwinding the reel of the core wire and the delivery cylinder.
  • the wire of soul is under maximum tension at the time of its insertion into the wick of fibers and we find the drawback mentioned above namely that he does not have enough freedom to follow the movement of the wick on said delivery cylinder.
  • the stretching that the core thread undergoes is not optimal for it to be stabilized. Therefore, at the time of its insertion in the wick of fibers, it still stretches randomly and causes differences in elongation in the finished wire.
  • French patent FR-A-1 398 558 describes a process for manufacturing a wire composite elastic of high apparent volume from one or more non-elastic filaments twisted with an elastic synthetic filament. he it is expected that the elastic filament will be stretched by a single stretching train provided in the area just before joining it with the other filaments non-elastic, between a pair of rollers and the delivery cylinder. This process does not allow the manufacture of a wire called "core spun". In addition, it presents all the disadvantages mentioned above.
  • French patent FR-A-1 430 763 describes a device for manufacturing wires highly swollen elastic bands, from one or more strands of fibers non-elastic twisted with an elastic synthetic filament. It is provided that the elastic filament is stretched by a single stretching train defined by the idler roller and the final stretching rollers between which it is simultaneously assembled with the wicks of fibers. We also find here same disadvantages as above.
  • the present invention is an improvement of the device described in the French Patent No. 2,668,174 and has the main purpose of overcoming the disadvantages mentioned above.
  • a device as defined in the preamble and characterized in that the deflection roller is distant from the delivery cylinder by a distance at least equal to 250 mm, in that the core wire is free over this whole distance, so that it can follow the variations of displacement small amplitude of the wick on the delivery cylinder, in that the device comprises means for drawing said core wire comprising a first drawing train defined by the support shaft and the idler roller and a second drawing train defined by the idler roller and the delivery cylinder and in that the total stretch coefficient obtained successively by the first stretching train and by the second stretching train is distributed at a rate of distribution which is much higher for the first drawing train compared to to the second drawing train in such a way that the core wire is present on the delivery cylinder with a very low differential tension, the distribution ratio of the stretch coefficient for the first stretch train being between 80 and 98% and that for the second stretch train being between 2 and 20%.
  • the distribution rate of the stretch coefficient for the first stretch train is close to 95% and that for the second stretching train is close to 5%.
  • the support shafts, the idler roller and the delivery cylinder are independently driven by motors individual powered by electronic speed controllers.
  • the device may include a programmable central control unit which controls said individual motors.
  • the distance between the idler roller and the delivery cylinder is preferably adjustable.
  • the idler roller has a V-shaped central groove, the bottom of said groove having a section in an arc, the radius of which depends on the diameter of the core wire.
  • the illustrated embodiment relates to a known type of machine, continuously manufacturing at least two similar threads 1 each of which is formed from a wick of cotton fibers 2, or a other material, and an elastic core wire 3, generally made of material synthetic LYCRA® type.
  • the two sons 1 are then returned or wound together in an unrepresented part of the machine.
  • Each wicks of fibers 2 is delivered, in the direction indicated by the arrows A, by a device not shown, crosses a drawing train 5, then passes on a delivery cylinder 6 against which it is applied by a roller presser 7.
  • Each core wire 3 is unwound from a spool 8 and passes over a deflection roller 9 before being introduced between the pressure roller 7 and the delivery cylinder 6 to join the wick 2 in the forming wire 1.
  • the idler roller 9 is positioned at an adjustable distance D from the cylinder deliverer 6 so that the core wire 3 is free to follow the displacement of the wick of fibers 2 on the delivery cylinder 6. From this way, the core wire 3 is automatically positioned inside the wick whatever the position of the insertion point on the delivery cylinder 6.
  • the distance D is adjustable, the idler roller being mounted on a mobile support at by means of a screw / nut system or by a jack (not shown). She can be variable from 250 to 400 mm but must not be less than 250 mm for the reasons mentioned above.
  • each coil 8 of core wire 3 rests freely on two similar horizontal rotary support shafts 20 and turning in the same direction, as indicated by the arrows. However, two coils 8 rotate in opposite directions in the example shown.
  • the two support shafts 20 of the same device are driven in synchronism at a speed V20 by means of an electric motor 21 powered by an electronic speed controller.
  • the cylinder deliverer 6 and the idler roller 9 are driven individually and respectively at a speed V6 and V9 by an electric motor 22, 23 powered by an electronic speed controller or any other device such as pulleys and toothed belts.
  • This type of drive allows precise adjustment of speeds V20 and V9 respectively as a function of the speed V6 which is generally defined by the technical characteristics of the fiber wick.
  • This insertion device is provided with means for stretching the elastic core wire 3 between the bearing shafts 20 and the cylinder deliverer 6.
  • These drawing means comprise two drawing trains, one first 24 defined by the support shafts 20 and the idler roller 9 and a second 25 defined by the idler roller 9 and the delivery cylinder 6.
  • the drawing coefficient of the first drawing train 24 which is obtained by the difference in speeds V9 -V20 is greater than the stretch coefficient of second drawing train 25 which is obtained by the difference in speeds V6-V9.
  • the first drawing train 24 will be adjusted to obtain a first coefficient of 3.25 and the second drawing train 25 for a second coefficient of 1.04.
  • the distribution rate of the total stretch coefficient for the first drawing train is between 80 and 98% and is preference close to 95% and that for the second drawing train is between 2 and 20% and is preferably close to 5%. It is obvious that a wide range of stretch coefficient and distribution ratio can be obtained without limitation.
  • This double drawing train allows on the one hand to stabilize the elasticity of the core wire 3 after a first stretch obtained thanks to the first drawing train 24 whose distribution rate of the drawing coefficient is much higher compared to the second drawing train 25.
  • a central control unit programmable 26 can advantageously complement this device so centralize the adjustment criteria and control parameters of the variable speed drives, and store adjustment programs defined by compared to a type of core wire 3 and a type of fiber wick 2.
  • FIG. 2 illustrates in detail the idler roller 9 of said device.
  • This pebble is preferably made of heat treated steel to present a condition surface with very low coefficient of friction and high resistance mechanical. It has a V-shaped groove 27 for guiding the core wire 3 perfectly.
  • the bottom 28 of the groove has an arcuate profile of circle whose radius depends on the diameter of said core wire 3. This profile rounded allows the core wire to be guided in good conditions without risking damage it, cut it or scratch it at a sharp angle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Description

La présente invention concerne un dispositif pour l'insertion en continu d'un fil d'âme élastique dans une mèche de fibres pour une machine à filer, afin de réaliser un fil appelé communément "core spun", comprenant un cylindre délivreur entraínant ensemble la mèche de fibres et le fil d'âme, des moyens de dévidage d'une bobine de fil d'âme en appui sur deux arbres d'appui à axes parallèles, entraínés dans le même sens de rotation et supportant ladite bobine, et un galet de renvoi du fil d'âme disposé entre les moyens de dévidage et le cylindre délivreur.The present invention relates to a device for the continuous insertion of a elastic core thread in a wick of fibers for a spinning machine, so to make a wire commonly called "core spun", comprising a cylinder deliverer bringing together the wick of fibers and the core thread, means for unwinding a coil of core wire resting on two support shafts parallel axes, driven in the same direction of rotation and supporting said coil, and a core wire return roller disposed between the means of unwinding and the delivery cylinder.

Le procédé de fabrication relatif à l'insertion d'un fil d'âme élastique dans une mèche de fibres dans une machine à filer est bien connu et permet la réalisation d'un fil de coton ou d'une autre matière, appelé communément "core spun", présentant des propriétés élastiques, notamment pour la fabrication des articles textiles en mailles tels que les tee-shirts, sous-vêtements, etc, et des articles textiles en chaínes et trames.The manufacturing process relating to the insertion of an elastic core wire into a wick of fibers in a spinning machine is well known and allows the making a cotton thread or another material, commonly called "core spun", having elastic properties, in particular for the manufacture of knitted textiles such as t-shirts, underwear, etc, and textile articles in warp and weft.

Ce procédé de fabrication nécessite un savoir-faire spécifique pour pouvoir obtenir un fil élastique de bonne qualité. On entend par bonne qualité, un fil produit qui présente, d'une part, des caractéristiques élastiques homogènes donc un pourcentage d'allongement équivalent à des points différents le long de ce fil et, d'autre part, un aspect extérieur régulier, sans dépassement du fil d'âme à la périphérie extérieure dudit fil fini. Un fil produit dont les caractéristiques élastiques sont homogènes permet d'obtenir un produit tricoté ou tissé d'aspect régulier. Dans le cas contraire, les différences d'élasticité engendrent des mailles plus serrées que d'autres. Ce qui peut provoquer des chevrons dans le produit tissé ou tricoté. Un fil produit dont l'aspect extérieur est régulier permet d'obtenir un produit tricoté ou tissé de couleur uniforme. Dans le cas contraire, si le fil d'âme apparaít à la périphérie du fil fini, il engendre des différences de coloration étant donné qu'il ne possède pas les mêmes caractéristiques tinctoriales que celles de la mèche, étant de nature différente. Ces différences de coloration peuvent générer des tâches ou traces plus foncées ou plus claires sur le produit tissé ou tricoté.This manufacturing process requires specific know-how to be able to get a good quality elastic thread. Good quality means a thread product which exhibits, on the one hand, homogeneous elastic characteristics so a percentage of elongation equivalent to different points the along this wire and, on the other hand, a regular external appearance, without overshoot core wire at the outer periphery of said finished wire. A product thread whose homogeneous elastic characteristics makes it possible to obtain a product knitted or woven with a regular appearance. Otherwise, the differences of elasticity create tighter stitches than others. What can cause chevrons in the woven or knitted product. A product thread of which the external appearance is regular allows to obtain a knitted or woven product of uniform color. Otherwise, if the core thread appears at the periphery of the finished yarn, it gives rise to differences in coloring given that it does not have the same dye characteristics as those of the wick, being of a different nature. These color differences can generate darker or lighter spots or traces on the woven product or knitted.

Les dispositifs connus ne permettent pas d'atteindre un niveau de qualité suffisant pour éviter les défauts mentionnés ci-dessus. Généralement, le galet de renvoi du fil d'âme est situé à proximité du cylindre délivreur sur lequel le fil d'âme est inséré dans la mèche de fibres. Il s'avère qu'au cours de son défilement, la mèche de fibres ne garde pas une position constante sur le cylindre délivreur. Au contraire, cette position oscille de part et d'autre d'un point central de manière aléatoire. Par conséquent, le point de rencontre entre le fil d'âme et la mèche de fibres n'est pas constant. Si le galet de renvoi du fil d'âme est trop rapproché du cylindre délivreur, le fil d'âme n'a pas assez de liberté pour suivre le mouvement de la mèche sur ledit cylindre délivreur. Il s'ensuit des défauts de positionnement du fil d'âme par rapport au centre de la mèche de fibres. De plus, les dispositifs connus ne comportent généralement qu'un seul train d'étirage entre le point de dévidage de la bobine du fil d'âme et le cylindre délivreur. Dans ce cas, le fil d'âme est sous une tension maximale au moment de son insertion dans la mèche de fibres et l'on retrouve l'inconvénient mentionné ci-dessus à savoir qu'il n'a pas assez de liberté pour suivre le mouvement de la mèche sur ledit cylindre délivreur. Par ailleurs, l'étirage que subit le fil d'âme n'est pas optimal pour qu'il soit stabilisé. Par conséquent, au moment de son insertion dans la mèche de fibres, il s'étire encore de manière aléatoire et provoque des différences d'allongement dans le fil fini.Known devices do not achieve a level of quality sufficient to avoid the faults mentioned above. Generally, the core wire deflection roller is located near the delivery cylinder on which the core thread is inserted into the fiber wick. It turns out that during the strand of fibers does not keep a constant position on the delivery cylinder. On the contrary, this position oscillates on both sides from a central point randomly. Therefore, the point of encounter between the core thread and the wick of fibers is not constant. If the return roller of the core wire is too close to the delivery cylinder, the wire soul does not have enough freedom to follow the movement of the wick on said delivery cylinder. This results in positioning faults in the core wire relative to the center of the wick of fibers. In addition, the known devices generally only have one drawing train between the point of unwinding the reel of the core wire and the delivery cylinder. In this case, the wire of soul is under maximum tension at the time of its insertion into the wick of fibers and we find the drawback mentioned above namely that he does not have enough freedom to follow the movement of the wick on said delivery cylinder. Furthermore, the stretching that the core thread undergoes is not optimal for it to be stabilized. Therefore, at the time of its insertion in the wick of fibers, it still stretches randomly and causes differences in elongation in the finished wire.

Le brevet français FR-A-1 398 558 décrit un procédé de fabrication d'un fil élastique composite de volume apparent élevé à partir d'un ou de plusieurs filaments non élastiques retordus avec un filament synthétique élastique. Il est prévu que le filament élastique soit étiré par un seul train d'étirage prévu dans la zone située juste avant son assemblage avec les autres filaments non élastiques, entre une paire de galets et le cylindre délivreur. Ce procédé ne permet pas la fabrication d'un fil appelé "core spun". De plus, il présente tous les inconvénients mentionnés ci-dessus. French patent FR-A-1 398 558 describes a process for manufacturing a wire composite elastic of high apparent volume from one or more non-elastic filaments twisted with an elastic synthetic filament. he it is expected that the elastic filament will be stretched by a single stretching train provided in the area just before joining it with the other filaments non-elastic, between a pair of rollers and the delivery cylinder. This process does not allow the manufacture of a wire called "core spun". In addition, it presents all the disadvantages mentioned above.

Le brevet français FR-A-1 430 763 décrit un dispositif de fabrication de fils élastiques fortement gonflés, à partir d'une ou de plusieurs mèches de fibres non élastiques retordues avec un filament synthétique élastique. Il est prévu que le filament élastique soit étiré par un seul train d'étirage défini par le galet de renvoi et les rouleaux d'étirage final entre lesquels il est simultanément assemblé aux mèches de fibres. On retrouve là aussi les mêmes inconvénients que précités.French patent FR-A-1 430 763 describes a device for manufacturing wires highly swollen elastic bands, from one or more strands of fibers non-elastic twisted with an elastic synthetic filament. It is provided that the elastic filament is stretched by a single stretching train defined by the idler roller and the final stretching rollers between which it is simultaneously assembled with the wicks of fibers. We also find here same disadvantages as above.

La présente invention est un perfectionnement du dispositif décrit dans le brevet français n° 2 668 174 et a pour but principal de pallier aux inconvénients mentionnés ci-dessus.The present invention is an improvement of the device described in the French Patent No. 2,668,174 and has the main purpose of overcoming the disadvantages mentioned above.

Ce but est atteint par un dispositif tel que défini en préambule et caractérisé en ce que le galet de renvoi est éloigné du cylindre délivreur d'une distance au moins égale à 250 mm, en ce que le fil d'âme est libre sur toute cette distance, de telle manière qu'il puisse suivre les variations de déplacement de faible amplitude de la mèche sur le cylindre délivreur, en ce que le dispositif comporte des moyens d'étirage dudit fil d'âme comportant un premier train d'étirage défini par l'arbre d'appui et le galet de renvoi et un second train d'étirage défini par le galet de renvoi et le cylindre délivreur et en ce que le coefficient d'étirage total obtenu successivement par le premier train d'étirage et par le second train d'étirage est réparti selon un taux de répartition qui est très supérieur pour le premier train d'étirage par rapport au second train d'étirage de telle manière que le fil d'âme se présente sur le cylindre délivreur avec une très faible tension différentielle, le taux de répartition du coefficient d'étirage pour le premier train d'étirage étant compris entre 80 et 98 % et celui pour le second train d'étirage étant compris entre 2 et 20 %.This object is achieved by a device as defined in the preamble and characterized in that the deflection roller is distant from the delivery cylinder by a distance at least equal to 250 mm, in that the core wire is free over this whole distance, so that it can follow the variations of displacement small amplitude of the wick on the delivery cylinder, in that the device comprises means for drawing said core wire comprising a first drawing train defined by the support shaft and the idler roller and a second drawing train defined by the idler roller and the delivery cylinder and in that the total stretch coefficient obtained successively by the first stretching train and by the second stretching train is distributed at a rate of distribution which is much higher for the first drawing train compared to to the second drawing train in such a way that the core wire is present on the delivery cylinder with a very low differential tension, the distribution ratio of the stretch coefficient for the first stretch train being between 80 and 98% and that for the second stretch train being between 2 and 20%.

Le taux de répartition du coefficient d'étirage pour le premier train d'étirage est voisin de 95 % et celui pour le second train d'étirage est voisin de 5 %.The distribution rate of the stretch coefficient for the first stretch train is close to 95% and that for the second stretching train is close to 5%.

Selon la réalisation préférée, les arbres d'appui, le galet de renvoi et le cylindre délivreur sont entraínés indépendamment par des moteurs individuels alimentés par des variateurs de vitesse électroniques. According to the preferred embodiment, the support shafts, the idler roller and the delivery cylinder are independently driven by motors individual powered by electronic speed controllers.

Le dispositif peut comporter une unité centrale de commande programmable qui commande lesdits moteurs individuels.The device may include a programmable central control unit which controls said individual motors.

La distance entre le galet de renvoi et le cylindre délivreur est de préférence réglable.The distance between the idler roller and the delivery cylinder is preferably adjustable.

Conformément à la réalisation préférée, le galet de renvoi comporte une gorge centrale en forme de V, le fond de ladite gorge présentant une section en arc de cercle dont le rayon dépend du diamètre du fil d'âme.In accordance with the preferred embodiment, the idler roller has a V-shaped central groove, the bottom of said groove having a section in an arc, the radius of which depends on the diameter of the core wire.

La présente invention et ses avantages apparaítront mieux dans la description suivante d'un exemple de réalisation, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique en élévation d'une partie d'une machine à filer pourvue de deux dispositifs selon l'invention, et
  • la figure 2 est une vue détaillée du galet de renvoi du dispositif de l'invention.
The present invention and its advantages will appear better in the following description of an exemplary embodiment, with reference to the appended drawings, in which:
  • FIG. 1 is a diagrammatic elevation view of part of a spinning machine provided with two devices according to the invention, and
  • Figure 2 is a detailed view of the idler roller of the device of the invention.

En référence à la figure 1, l'exemple de réalisation illustré se rapporte à un type de machine connu, fabriquant en continu au moins deux fils semblables 1 dont chacun est formé à partir d'une mèche de fibres de coton 2, ou d'une autre matière, et d'un fil d'âme élastique 3, généralement en matière synthétique du type LYCRA®. Les deux fils 1 sont ensuite renvidés ou bobinés ensemble dans une partie non représentée de la machine. Chacune des mèches de fibres 2 est délivrée, dans le sens indiqué par les flèches A, par un dispositif non représenté, traverse un train d'étirage 5, puis passe sur un cylindre délivreur 6 contre lequel elle est appliquée par un rouleau presseur 7. Chaque fil d'âme 3 est déroulé d'une bobine 8 et passe sur un galet de renvoi 9 avant d'être introduit entre le rouleau presseur 7 et le cylindre délivreur 6 pour se joindre à la mèche 2 dans le fil en formation 1. Le galet de renvoi 9 est positionné à une distance D réglable du cylindre délivreur 6 de manière à ce que le fil d'âme 3 soit libre de suivre le déplacement de la mèche de fibres 2 sur le cylindre délivreur 6. De cette façon, le fil d'âme 3 se positionne automatiquement à l'intérieur de la mèche quelque soit la position du point d'insertion sur le cylindre délivreur 6. La distance D est réglable, le galet de renvoi étant monté sur un support mobile au moyen d'un système de vis/écrou ou par un vérin (non représenté). Elle peut être variable de 250 à 400 mm mais ne doit pas être inférieure à 250 mm pour les raisons mentionnées ci-dessus.Referring to Figure 1, the illustrated embodiment relates to a known type of machine, continuously manufacturing at least two similar threads 1 each of which is formed from a wick of cotton fibers 2, or a other material, and an elastic core wire 3, generally made of material synthetic LYCRA® type. The two sons 1 are then returned or wound together in an unrepresented part of the machine. Each wicks of fibers 2 is delivered, in the direction indicated by the arrows A, by a device not shown, crosses a drawing train 5, then passes on a delivery cylinder 6 against which it is applied by a roller presser 7. Each core wire 3 is unwound from a spool 8 and passes over a deflection roller 9 before being introduced between the pressure roller 7 and the delivery cylinder 6 to join the wick 2 in the forming wire 1. The idler roller 9 is positioned at an adjustable distance D from the cylinder deliverer 6 so that the core wire 3 is free to follow the displacement of the wick of fibers 2 on the delivery cylinder 6. From this way, the core wire 3 is automatically positioned inside the wick whatever the position of the insertion point on the delivery cylinder 6. The distance D is adjustable, the idler roller being mounted on a mobile support at by means of a screw / nut system or by a jack (not shown). She can be variable from 250 to 400 mm but must not be less than 250 mm for the reasons mentioned above.

Dans le dispositif selon l'invention, chaque bobine 8 de fil d'âme 3 repose librement sur deux arbres d'appui rotatifs horizontaux 20 semblables et tournant dans le même sens, comme l'indiquent les flèches. Par contre, les deux bobines 8 tournent dans des sens opposés dans l'exemple représenté. Les deux arbres d'appui 20 d'un même dispositif sont entraínés en synchronisme à une vitesse V20 au moyen d'un moteur électrique 21 alimenté par un variateur de vitesse électronique. De même, le cylindre délivreur 6 et le galet de renvoi 9 sont entraínés individuellement et respectivement à une vitesse V6 et V9 par un moteur électrique 22, 23 alimenté par un variateur de vitesse électronique ou par tout autre dispositif de commande comme par exemple des poulies et courroies crantées. Ce type d'entraínement permet de régler de manière précise les vitesses respectives V20 et V9 en fonction de la vitesse V6 qui est généralement définie par les caractéristiques techniques de la mèche de fibres. Le réglage, une fois effectué, reste stable et garantit une vitesse circonférentielle tout à fait constante de la bobine 8 par rapport à celle du galet de renvoi 9 et du cylindre délivreur 6, donc une tension régulière du fil 3 entre ces trois éléments. Ce dispositif d'insertion est pourvu de moyens d'étirage du fil d'âme élastique 3 entre les arbres d'appui 20 et le cylindre délivreur 6. Ces moyens d'étirage comportent deux trains d'étirage, un premier 24 défini par les arbres d'appui 20 et le galet de renvoi 9 et un second 25 défini par le galet de renvoi 9 et le cylindre délivreur 6. Le coefficient d'étirage du premier train d'étirage 24 qui est obtenu par la différence des vitesses V9 -V20 est supérieur au coefficient d'étirage du second train d'étirage 25 qui est obtenu par la différence des vitesses V6-V9. Par exemple, si le coefficient d'étirage total du fil d'âme doit être de 3,38, le premier train d'étirage 24 sera réglé pour obtenir un premier coefficient de 3,25 et le second train d'étirage 25 pour un second coefficient de 1,04. In the device according to the invention, each coil 8 of core wire 3 rests freely on two similar horizontal rotary support shafts 20 and turning in the same direction, as indicated by the arrows. However, two coils 8 rotate in opposite directions in the example shown. The two support shafts 20 of the same device are driven in synchronism at a speed V20 by means of an electric motor 21 powered by an electronic speed controller. Likewise, the cylinder deliverer 6 and the idler roller 9 are driven individually and respectively at a speed V6 and V9 by an electric motor 22, 23 powered by an electronic speed controller or any other device such as pulleys and toothed belts. This type of drive allows precise adjustment of speeds V20 and V9 respectively as a function of the speed V6 which is generally defined by the technical characteristics of the fiber wick. The adjustment, once made, remains stable and guarantees speed completely constant circumference of coil 8 with respect to that of idler roller 9 and delivery cylinder 6, therefore regular tension of the wire 3 between these three elements. This insertion device is provided with means for stretching the elastic core wire 3 between the bearing shafts 20 and the cylinder deliverer 6. These drawing means comprise two drawing trains, one first 24 defined by the support shafts 20 and the idler roller 9 and a second 25 defined by the idler roller 9 and the delivery cylinder 6. The drawing coefficient of the first drawing train 24 which is obtained by the difference in speeds V9 -V20 is greater than the stretch coefficient of second drawing train 25 which is obtained by the difference in speeds V6-V9. For example, if the total stretch coefficient of the core wire should be 3.38, the first drawing train 24 will be adjusted to obtain a first coefficient of 3.25 and the second drawing train 25 for a second coefficient of 1.04.

D'une manière générale, le taux de répartition du coefficient d'étirage total pour le premier train d'étirage est compris entre 80 et 98 % et est de préférence voisin de 95 % et celui pour le second train d'étirage est compris entre 2 et 20 % et est de préférence voisin de 5 %. Il est évident qu'une large gamme de coefficient d'étirage et de taux de répartition peut être obtenue sans limitation. Ce double train d'étirage permet d'une part de stabiliser l'élasticité du fil d'âme 3 après un premier étirage obtenu grâce au premier train d'étirage 24 dont le taux de répartition du coefficient d'étirage est très supérieur par rapport au second train d'étirage 25. D'autre part, il permet de présenter le fil d'âme 3 sur le cylindre délivreur 6 avec une très faible tension différentielle lui permettant d'avoir suffisamment de liberté pour suivre les mouvements de la mèche sur le cylindre délivreur 6, ceci grâce au second train d'étirage 25 dont le taux de répartition du coefficient est très inférieur par rapport au premier train d'étirage 24. Les valeurs de réglage des vitesses V20 et V9 sont dépendantes de la nature et de la qualité du fil d'âme 3 ainsi que des propriétés élastiques recherchées dans le fil produit 1. En fonction de ces critères, l'opérateur règle les vitesses V20, V9 et V6 au démarrage par des essais. Ces réglages sont réalisables aisément par l'intermédiaire des variateurs de vitesse électroniques associés à chaque moteur 21-23. Une unité centrale de commande programmable 26 peut compléter avantageusement ce dispositif de manière à centraliser les critères de réglage et les paramètres de commande des variateurs de vitesse, et mémoriser des programmes de réglage définis par rapport à un type de fil d'âme 3 et à un type de mèche de fibres 2.In general, the distribution rate of the total stretch coefficient for the first drawing train is between 80 and 98% and is preference close to 95% and that for the second drawing train is between 2 and 20% and is preferably close to 5%. It is obvious that a wide range of stretch coefficient and distribution ratio can be obtained without limitation. This double drawing train allows on the one hand to stabilize the elasticity of the core wire 3 after a first stretch obtained thanks to the first drawing train 24 whose distribution rate of the drawing coefficient is much higher compared to the second drawing train 25. On the other hand, it allows to present the core wire 3 on the delivery cylinder 6 with a very low differential voltage allowing it to have enough freedom to follow the movements of the drill bit on the delivery cylinder 6, this thanks to the second stretching train 25 whose distribution rate of the coefficient is much lower compared to the first drawing train 24. The values of speed setting V20 and V9 are dependent on the nature and quality of the core wire 3 as well as the elastic properties sought in the wire produced 1. According to these criteria, the operator adjusts the speeds V20, V9 and V6 at start-up by tests. These settings are achievable easily via electronic speed controllers associated with each motor 21-23. A central control unit programmable 26 can advantageously complement this device so centralize the adjustment criteria and control parameters of the variable speed drives, and store adjustment programs defined by compared to a type of core wire 3 and a type of fiber wick 2.

La figure 2 illustre en détail le galet de renvoi 9 dudit dispositif. Ce galet est de préférence réalisé en acier traité thermiquement pour présenter un état de surface à très faible coefficient de frottement et d'une grande résistance mécanique. Il comporte une gorge 27 en forme de V permettant de guider parfaitement le fil d'âme 3. Le fond 28 de la gorge comporte un profil en arc de cercle dont le rayon dépend du diamètre dudit fil d'âme 3. Ce profil arrondi permet de guider le fil d'âme dans de bonnes conditions sans risquer de l'abímer, de le couper ou de l'érailler par un angle vif.Figure 2 illustrates in detail the idler roller 9 of said device. This pebble is preferably made of heat treated steel to present a condition surface with very low coefficient of friction and high resistance mechanical. It has a V-shaped groove 27 for guiding the core wire 3 perfectly. The bottom 28 of the groove has an arcuate profile of circle whose radius depends on the diameter of said core wire 3. This profile rounded allows the core wire to be guided in good conditions without risking damage it, cut it or scratch it at a sharp angle.

Claims (6)

  1. Device for continuously inserting an elastic core thread (3) in a staple sliver (2) for a spinning machine, in order to make a yarn which is commonly called "core spun yarn", this device comprising a draw-off roll (6) driving together the staple sliver (2) and the core thread (3), means of unwinding a reel (8) of core thread (3) resting on two support spindles (20) with parallel axes, driven in the same direction of rotation and supporting said reel (8), and a roller for returning (9) the core thread (3) arranged between the unwinding means (8, 20) and the draw-off roll (6), characterised in that the returning roller (9) is located at a distance (D) from the draw-off roll (6) which is at least equal to 250 mm, in that the core thread (3) is free over this entire distance (D), so that it can follow the changes in movement of the sliver (2) on the draw-off roll (6), in that said device comprises means of drawing said core thread (3) comprising a first drawing line (24) defined by the support spindle (20) and the returning roller (9) and a second drawing line (25) defined by the returning roller (9) and the draw-off roll (6), and in that the total drawing coefficient obtained successively by the first drawing line (24) and the second drawing line (25) is distributed according to a distribution ratio which is greater for the first drawing line (24) compared with the second drawing line (25) so that the core thread (3) is presented on the draw-off roll (6) with a very low differential tension, the distribution ratio of the drawing coefficient for the first drawing line (24) lying between 80 and 98% and that of the second drawing line (25) lying between 2 and 20%.
  2. Device according to claim 1, characterised in that the distribution ratio of the drawing coefficient for the first drawing line (24) is in the vicinity of 95% and that of the second drawing line (25) is in the vicinity of 5%.
  3. Device according to claim 1, characterised in that the support spindles (20), the returning roller (9), and the draw-off roll (6) are driven independently by individual motors (21-23) fed by electronic variable speed drives.
  4. Device according to claim 3, characterised in that it comprises a programmable central control unit (26) designed to control said individual motors (21-23).
  5. Device according to claim 1, characterised in that the distance (D) between the returning roller (9) and the draw-off roll (6) is adjustable.
  6. Device according to claim 1, characterised in that the returning roller (9) comprises a V-shaped central groove (27), the bottom (28) of said groove presenting a section in an arc of a circle, the radius of which depends on the diameter of the core thread (3).
EP19960440055 1995-07-11 1996-07-11 Device for continuously inserting a core in a sliver Expired - Lifetime EP0753613B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9508585 1995-07-11
FR9508585A FR2736658B1 (en) 1995-07-11 1995-07-11 DEVICE FOR INSERTING A CORD THREAD IN A FIBER CORE

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EP0753613A1 EP0753613A1 (en) 1997-01-15
EP0753613B1 true EP0753613B1 (en) 2000-06-21

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DE (1) DE69608929D1 (en)
FR (1) FR2736658B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ300483B6 (en) * 2003-09-04 2009-05-27 Rieter Cz A.S. Device for unwinding linear textile material when producing component yarn
CN102471952B (en) * 2009-07-09 2015-07-08 阿姆斯勒纺织公司 Device and method for making a core yarn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2076271A (en) * 1935-09-12 1937-04-06 Harris Textile Machinery Corp Covered elastic thread
NL75778C (en) * 1958-05-20
FR1398558A (en) * 1964-06-12 1965-05-07 Monsanto Co Method for manufacturing a high bulk volume composite elastic yarn
FR1430763A (en) * 1965-04-21 1966-03-04 Chemstrand Ltd Method and apparatus for spinning highly swollen elastic yarns
US3342028A (en) * 1965-04-21 1967-09-19 Kurashiki Rayon Co Method of producing an elastic core yarn
FR2668174A1 (en) * 1990-10-17 1992-04-24 Meyer Michel Sa Entr Device for inserting a core thread in a rough roving of fibres
DE69218565T2 (en) * 1991-12-11 1997-08-07 Nitto Boseki Co Ltd Meltable adhesive yarn and process for its manufacture

Also Published As

Publication number Publication date
FR2736658A1 (en) 1997-01-17
FR2736658B1 (en) 1997-09-05
EP0753613A1 (en) 1997-01-15
DE69608929D1 (en) 2000-07-27

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