EP0450686B1 - Prewinder for looms and method for threading such prewinder - Google Patents

Prewinder for looms and method for threading such prewinder Download PDF

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Publication number
EP0450686B1
EP0450686B1 EP19910200596 EP91200596A EP0450686B1 EP 0450686 B1 EP0450686 B1 EP 0450686B1 EP 19910200596 EP19910200596 EP 19910200596 EP 91200596 A EP91200596 A EP 91200596A EP 0450686 B1 EP0450686 B1 EP 0450686B1
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EP
European Patent Office
Prior art keywords
tube
accumulator
thread
drum
thread guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19910200596
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German (de)
French (fr)
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EP0450686A1 (en
Inventor
Bertrand Desmet
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Picanol NV
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Picanol NV
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Publication date
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Publication of EP0450686A1 publication Critical patent/EP0450686A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/16—Devices for entraining material by flow of liquids or gases, e.g. air-blast devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H57/00—Guides for filamentary materials; Supports therefor
    • B65H57/003—Arrangements for threading or unthreading the guide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a pre-delivery device for weaving machines, and more particularly to a pre-delivery device which can be threaded automatically. It also relates to a method for donning a pre-delivery device.
  • feeding the weft thread to weaving machines consists in removing this weft thread from a spool, at accumulate it on a pre-delivery drum, then remove a certain length of thread from it during each insertion cycle, and insert it into the shed of the weaving machine by means of an insertion device using nozzles or pliers.
  • the accumulation of the weft thread on the pre-delivery drum takes place in a pre-delivery device which essentially consists, on the one hand, of the pre-delivery drum itself and, on the other hand, of a winding tube , one of whose two elements is powered by a motor.
  • the document WO-8902944 describes a pre-delivery device which can be threaded automatically, offering a solution to this problem.
  • the weft thread is led from the entry of the winding tube, through this winding tube, by a thread guide which extends along the pre-delivery drum and by a thread guide which passes through the nose of the pre-delivery drum to the exit of the pre-delivery device.
  • a part of the thread guide consists of a tube, having a slit in the length, arranged so that a weft thread can be blown through the tube and that this weft thread can be removed from tube through the slot by exerting traction on the wire from the outlet of the pre-delivery device.
  • the slot in question can also be closed by an elastic element which can be opened by the weft thread when a traction is exerted on this weft thread from the outlet of the pre-delivery device.
  • Such an automatic threading pre-delivery device has the disadvantage that it is impossible to transport the weft thread further downstream of the pre-delivery device without the thread leaving the tube through the slot.
  • this thread leaves the aforementioned tube through the slot and is carried on the brushes mounted all around the pre-delivery drum, and which we know to serve to brake the weft thread at sample.
  • the weft thread is braked so that transporting it further by an air jet is made difficult.
  • the present invention relates to a pre-delivery device which does not have the disadvantage mentioned above.
  • the present invention provides a pre-delivery device for weaving machines, consisting of a pre-delivery drum, a winding tube, drive means intended to rotate the tube relative to each other. winding and the pre-delivery drum, as well as a thread guide which extends along the pre-delivery drum, and at least part of which is formed of a tube having a longitudinal slot, characterized in that the pre-delivery device is provided with thread guide elements preventing a weft thread passed through the thread guide leaves the tube through the slot when traction is exerted on the thread from the outlet of the pre-delivery device.
  • the thread guide elements mentioned above may consist of a projection, a cutout or a similar shape located at the end of the slot, and more particularly at the level of the picking side of the pre-delivery drum.
  • the present invention also relates to a method for threading a pre-delivery device, characterized in that it consists of the following successive operations: transport, through a winding tube and a thread guide which extends along the pre-delivery drum, the weft thread to be threaded, in which the weft thread is guided through a tube having a longitudinal slot, as well as along thread guide elements which prevent this weft thread from leaving the tube through the slot when a pull is exerted on this wire from the outlet of the pre-delivery device; and, at the desired time, the displacement relative to each other of the winding tube and the thread guide so that the weft thread leaves the tube through the slot starting from the entry of this tube and comes to be applied on the pre-delivery drum.
  • FIG. 1 shows a pre-delivery device according to the invention, the winding tube 1, the pre-delivery drum 2 and a wire guide 3 are schematically represented.
  • the wire guide 3 comprises at least one tube 4 having a lateral slot 5, the part of the wall closest to the pre-delivery drum 2 is designated as the internal part 6.
  • the pre-delivery device is also provided with brushes 8 interacting with the pre-delivery drum 2 and intended to brake the weft thread 7 in normal use.
  • This pre-delivery device also comprises drive means 9 intended to rotate the winding tube 1 and the pre-delivery drum 2 relative to each other.
  • the winding tube 1 can rotate around a fixed pre-delivery drum 2.
  • the drive means 9 used in the example are an electric motor actuating the winding tube 1.
  • the wire guide 3, as illustrated in FIG. 1, is composed, on the one hand, of the tube 4 mentioned above, extending longitudinally along the surface 10 of the pre-delivery drum 2 and having on the side a longitudinal slot 5, and, on the other hand, bent parts 11 and 12, a thread guide 13 placed in the nose 14 of the pre-delivery drum 2 and a thread guide eyelet 15 placed at the outlet 16 of the pre-delivery device.
  • the bent part 11 establishes a junction between the tube 4 and the winding tube 1, and the bent part 12 makes a transition from the tube 4 to the wire guide 13 in the nose 14.
  • the wire guide 3 is provided with a number of air nozzles 17, 18 and 19 arranged for example in the bent pieces 11 and 12 and in the wire guide eyelet 15.
  • the inlet 20 of the tube winding 1 also has an air nozzle 21.
  • the air nozzles 17, 18, 19 and 21 are supplied by a source of compressed air 22 and can be controlled by a controlled valve 23.
  • the brushes 8 mentioned are fixed in a circular seat 24 and collaborate on the sampling side 25 of the pre-delivery drum 2.
  • an electromagnetically controlled spindle 26 can be provided to prevent the weft yarn from being picked up. 7 of the pre-delivery drum 2.
  • the device is provided with means 27 determining whether the winding tube 1 is presented in front of the bent part 11; these means can for example consist of a detector.
  • These means 27 can interact with a control unit 28 to control the drive means 9 mentioned above, and having means enabling it to control the drive means 9 so that the winding tube 1 comes stand in front of the means 27 and the bent part 11 of the wire guide.
  • This control unit 28 can also control the electromagnetically controlled spindle 26 and the valve 23 mentioned above.
  • the present invention is characterized in that the pre-delivery device is provided with thread guide elements 29 preventing a weft thread 7 present in the tube 4 from leaving this tube 4 through the slot 5 when traction is exerted on this weft thread 7 from the outlet 16; this characteristic offering the advantage that the weft yarn 7 cannot leave the tube 4 under the action of such traction, which in particular has the effect of allowing further transport of the weft yarn 7 without it be pulled through the brushes 8.
  • these thread guide elements 29 will, in a preferred embodiment, a lip-shaped end of the wall of the tube 4 at the level of the sampling side 25 of the pre-delivery drum 2. As illustrated in FIGS. 2 to 5, this lip-shaped end protrudes in a way, preventing, when a traction K is exerted on the weft thread 7, that it leaves the tube 4 by the slot 5, since the lip-shaped end protrudes by a distance D1 from the place 30 where the weft thread 7 leaves the tube 4.
  • the movement of the weft thread 7 is also prevented by the fact that the lower edge 31 of the slot 5 is at a distance D2 above the inner edge 32, and more particularly the edge of the tube 4 closest to the surface 10 of the pre-delivery drum 2.
  • the threading of the pre-delivery device is obtained by positioning the winding tube 1 in front of the bent piece 11; by presenting, manually or automatically, a weft thread 7 in front of the inlet 20; by supplying the air nozzles 17, 18, 19, and 21 with compressed air via the valve 23.
  • the weft thread 7 is thus blown through the pre-delivery device following a path such as that marked by X in Figure 1.
  • FIG. 7 represents a variant in which the wire guide elements 29 consist of a cut in the wall of the tube 4, up to the interior part 6.
  • the tube 4 and the bent pieces 11 and 12, as shown in Figures 1 to 6, can be made in the form of a single piece.
  • the tube 4 is fixed, as illustrated in FIG. 8, by means of a removable support 33 to the frame 34 of the pre-delivery device.
  • the frame 34 and the seat 24 of the brushes 8 have a passage 35 which allows the weft thread 7 to be brought to the pre-delivery drum 2.
  • FIG. 9 represents a variant according to the invention in which the circular frame 34 is of an uninterrupted part, which gives it greater solidity of construction.
  • the bent parts 11 and 12 are, as illustrated in FIG. 10, separate parts. It is obvious that these bent pieces 11 and 12, produced in separate pieces, are arranged in the extension of the tube 4.
  • the invention also relates to a method for threading a pre-delivery device, and more particularly a pre-delivery device of the type described above.
  • a weft thread 7 is introduced into the thread guide 3 and, at the desired time, this weft thread 7 is extracted from the mentioned tube 4 by turning the winding tube 1 and the thread guide 3 in relation to the other, in a direction which allows the weft thread 7 to pass over the lower edge 31 starting from the inlet of the tube 4.
  • the extraction of the weft thread 7 from the tube 4 is identified by Z in FIG. 1.
  • the winding tube 1 is turned under the action of the drive means 9 placed under the control of the control unit 28.
  • the present invention is therefore also characterized in that a weft thread 7 introduced into the tube 4 can leave this tube 4 through the slot 5 only when the winding tube 1 is rotated, which offers the advantage that the weft thread 7 will not leave the tube 4 until the opportune moment.
  • weft thread 7 in the embodiment shown, is blown through the winding tube 1 and the thread guide 3, it is not excluded that the thread can be brought in by a different method, for example by using a grommet, system by which the thread is clamped in a hook and pulled by a flexible link through the winding tube 1 and the thread guide 3.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Description

La présente invention a trait à un dispositif prédélivreur pour machines à tisser, et plus particulièrement à un dispositif prédélivreur pouvant être enfilé automatiquement. Elle concerne également une méthode pour enfiler un dispositif prédélivreur.The present invention relates to a pre-delivery device for weaving machines, and more particularly to a pre-delivery device which can be threaded automatically. It also relates to a method for donning a pre-delivery device.

On sait que l'alimentation du fil de trame aux machines à tisser consiste à retirer ce fil de trame d'une bobine, à l'accumuler sur un tambour prédélivreur, à en retirer ensuite à chaque cycle d'insertion une certaine longueur de fil, et à l'insérer dans la foule de la machine à tisser au moyen d'un dispositif d'insertion utilisant des buses ou des pinces.We know that feeding the weft thread to weaving machines consists in removing this weft thread from a spool, at accumulate it on a pre-delivery drum, then remove a certain length of thread from it during each insertion cycle, and insert it into the shed of the weaving machine by means of an insertion device using nozzles or pliers.

L'accumulation du fil de trame sur le tambour prédélivreur a lieu dans un dispositif prédélivreur qui se compose pour l'essentiel, d'une part, du tambour prédélivreur lui-même et, d'autre part, d'un tube d'enroulement, dont un des deux éléments est actionné par un moteur.The accumulation of the weft thread on the pre-delivery drum takes place in a pre-delivery device which essentially consists, on the one hand, of the pre-delivery drum itself and, on the other hand, of a winding tube , one of whose two elements is powered by a motor.

L'enfilage manuel d'un tel dispositif prédélivreur, que ce soit au début d'un tissage, à la suite d'une rupture de fil ou pour changer de type de fil de trame, est une opération qui prend un temps considérable.Manual threading of such a pre-delivery device, whether at the start of weaving, following a thread break or to change the type of weft thread, is an operation which takes considerable time.

On sait que le document WO-8902944 décrit un dispositif prédélivreur pouvant être enfilé automatiquement, offrant une solution à ce problème. Selon ce système, le fil de trame est mené depuis l'entrée du tube d'enroulement, au travers de ce tube d'enroulement, par un guide-fil qui s'étend le long du tambour prédélivreur et par un guide-fil qui passe dans le nez du tambour prédélivreur jusqu'à la sortie du dispositif prédélivreur. Dans ce cas, une partie du guide-fil est constituée d'un tube, comportant une fente dans la longueur, disposé de manière à ce qu'un fil de trame puisse être soufflé au travers du tube et que ce fil de trame puisse être retiré du tube par la fente en exerçant une traction sur le fil depuis la sortie du dispositif prédélivreur.We know that the document WO-8902944 describes a pre-delivery device which can be threaded automatically, offering a solution to this problem. According to this system, the weft thread is led from the entry of the winding tube, through this winding tube, by a thread guide which extends along the pre-delivery drum and by a thread guide which passes through the nose of the pre-delivery drum to the exit of the pre-delivery device. In this case, a part of the thread guide consists of a tube, having a slit in the length, arranged so that a weft thread can be blown through the tube and that this weft thread can be removed from tube through the slot by exerting traction on the wire from the outlet of the pre-delivery device.

La fente en question peut également être fermée par un élément élastique qui peut être ouvert par le fil de trame lorsqu'on exerce sur ce fil de trame une traction depuis la sortie du dispositif prédélivreur.The slot in question can also be closed by an elastic element which can be opened by the weft thread when a traction is exerted on this weft thread from the outlet of the pre-delivery device.

Un tel dispositif prédélivreur à enfilage automatique présente le désavantage qu'il est impossible de transporter le fil de trame plus loin en aval du dispositif prédélivreur sans que le fil ne quitte le tube par la fente. En effet, lorsque le fil de trame est tiré plus loin, ce fil quitte le tube précité par la fente et est mené sur les brosses montées tout autour du tambour prédélivreur, et dont on sait qu'elles servent à freiner le fil de trame au prélèvement. Dans ce cas, le fil de trame est freiné de manière à ce que le transporter plus loin par un jet d'air soit rendu difficile.Such an automatic threading pre-delivery device has the disadvantage that it is impossible to transport the weft thread further downstream of the pre-delivery device without the thread leaving the tube through the slot. In fact, when the weft thread is drawn further, this thread leaves the aforementioned tube through the slot and is carried on the brushes mounted all around the pre-delivery drum, and which we know to serve to brake the weft thread at sample. In this case, the weft thread is braked so that transporting it further by an air jet is made difficult.

La présente invention a trait à un dispositif prédélivreur qui ne présente pas le désavantage mentionné ci-dessus.The present invention relates to a pre-delivery device which does not have the disadvantage mentioned above.

A cet effet, la présente invention prévoit un dispositif prédélivreur pour machines à tisser, constitué d'un tambour prédélivreur, d'un tube d'enroulement, de moyens d'entraînement destinés à tourner l'un par rapport à l'autre le tube d'enroulement et le tambour prédélivreur, ainsi que d'un guide-fil qui s'étend le long du tambour prédélivreur, et dont une partie au moins est formée d'un tube comportant une fente longitudinale, caractérisé par le fait que le dispositif prédélivreur est pourvu d'éléments guide-fil empêchant qu'un fil de trame passé dans le guide-fil quitte le tube par la fente lorsqu'on exerce une traction sur le fil depuis la sortie du dispositif prédélivreur.To this end, the present invention provides a pre-delivery device for weaving machines, consisting of a pre-delivery drum, a winding tube, drive means intended to rotate the tube relative to each other. winding and the pre-delivery drum, as well as a thread guide which extends along the pre-delivery drum, and at least part of which is formed of a tube having a longitudinal slot, characterized in that the pre-delivery device is provided with thread guide elements preventing a weft thread passed through the thread guide leaves the tube through the slot when traction is exerted on the thread from the outlet of the pre-delivery device.

Les éléments guide-fil mentionnés ci-dessus peuvent consister en une saillie, une découpe ou une forme semblable située à l'extrémité de la fente, et plus particulièrement à hauteur du côté de prélèvement du tambour prédélivreur.The thread guide elements mentioned above may consist of a projection, a cutout or a similar shape located at the end of the slot, and more particularly at the level of the picking side of the pre-delivery drum.

La présente invention concerne également une méthode pour enfiler un dispositif prédélivreur, caractérisée par le fait qu'elle se compose des opérations successives suivantes : le transport, au travers d'un tube d'enroulement et d'un guide-fil qui s'étend le long du tambour prédélivreur, du fil de trame à enfiler, dans lequel le fil de trame est guidé au travers d'un tube comportant une fente longitudinale, ainsi que le long d'éléments guide-fil qui empêchent ce fil de trame de quitter le tube par la fente lorsqu'on exerce une traction sur ce fil depuis la sortie du dispositif prédélivreur; et, au moment voulu, le déplacement l'un par rapport à l'autre du tube d'enroulement et du guide-fil de manière à ce que le fil de trame quitte le tube par la fente en partant de l'entrée de ce tube et vienne s'appliquer sur le tambour prédélivreur.The present invention also relates to a method for threading a pre-delivery device, characterized in that it consists of the following successive operations: transport, through a winding tube and a thread guide which extends along the pre-delivery drum, the weft thread to be threaded, in which the weft thread is guided through a tube having a longitudinal slot, as well as along thread guide elements which prevent this weft thread from leaving the tube through the slot when a pull is exerted on this wire from the outlet of the pre-delivery device; and, at the desired time, the displacement relative to each other of the winding tube and the thread guide so that the weft thread leaves the tube through the slot starting from the entry of this tube and comes to be applied on the pre-delivery drum.

Les caractéristiques de l'invention sont revendiquées dans les revendications 1 à 7.The features of the invention are claimed in claims 1 to 7.

Afin de mieux mettre en lumière les caractéristiques de l'invention, on trouvera ci-après la description, donnée à titre d'exemple seulement et sans aucun caractère limitatif, de quelques formes d'exécution préférentielles, avec références aux dessins annexés, dans lesquels :

  • la figure 1 présente un dispositif prédélivreur selon l'invention;
  • la figure 2 donne une vue agrandie et en perspective dans le sens de la flèche F2 de la figure 1;
  • les figures 3 et 4 représentent des vues, dans le sens des flèches F3 et F4, respectivement, de la figure 2;
  • les figures 5 et 6 donnent une vue en coupe selon les axes V-V et VI-VI, respectivement, de la figure 3;
  • la figure 7 présente une variante d'une vue analogue à celle de la figure 5;
  • la figure 8 présente une vue en coupe selon l' axe VIII-VIII de la figure 1;
  • la figure 9 présente une variante de la vue représentée à la figure 8;
  • la figure 10 présente une autre variante.
In order to better highlight the characteristics of the invention, the description below, given by way of example only and without any limiting nature, of some preferred embodiments, with reference to the accompanying drawings, in which :
  • Figure 1 shows a pre-delivery device according to the invention;
  • Figure 2 gives an enlarged perspective view in the direction of the arrow F2 in Figure 1;
  • Figures 3 and 4 show views, in the direction of the arrows F3 and F4, respectively, of Figure 2;
  • Figures 5 and 6 give a sectional view along the axes VV and VI-VI, respectively, of Figure 3;
  • Figure 7 shows a variant of a view similar to that of Figure 5;
  • Figure 8 shows a sectional view along the axis VIII-VIII of Figure 1;
  • Figure 9 shows a variant of the view shown in Figure 8;
  • Figure 10 shows another variant.

La figure 1 présente un dispositif prédélivreur selon l'invention, dont le tube d'enroulement 1, le tambour prédélivreur 2 ainsi qu'un guide-fil 3 sont schématiquement représentés. Le guide-fil 3 comporte au moins un tube 4 ayant une fente 5 latérale, dont la partie de la paroi la plus proche du tambour prédélivreur 2 est désignée comme étant la partie intérieure 6.FIG. 1 shows a pre-delivery device according to the invention, the winding tube 1, the pre-delivery drum 2 and a wire guide 3 are schematically represented. The wire guide 3 comprises at least one tube 4 having a lateral slot 5, the part of the wall closest to the pre-delivery drum 2 is designated as the internal part 6.

Le dispositif prédélivreur est également pourvu de brosses 8 interagissant avec le tambour prédélivreur 2 et destinées à freiner le fil de trame 7 en usage normal.The pre-delivery device is also provided with brushes 8 interacting with the pre-delivery drum 2 and intended to brake the weft thread 7 in normal use.

Ce dispositif prédélivreur comprend également des moyens d'entraînement 9 destinés à tourner l'un par rapport à l'autre le tube d'enroulement 1 et le tambour prédélivreur 2. Dans la forme d'exécution illustrée, le tube d'enroulement 1 peut tourner autour d'un tambour prédélivreur 2 fixe. Les moyens d'entraînement 9 utilisés dans l'exemple sont un moteur électrique actionnant le tube d'enroulement 1.This pre-delivery device also comprises drive means 9 intended to rotate the winding tube 1 and the pre-delivery drum 2 relative to each other. In the illustrated embodiment, the winding tube 1 can rotate around a fixed pre-delivery drum 2. The drive means 9 used in the example are an electric motor actuating the winding tube 1.

Le guide-fil 3, tel qu'illustré à la figure 1, est composé, d'une part, du tube 4 mentionné ci-dessus, s'étendant longitudinalement le long de la surface 10 du tambour prédélivreur 2 et présentant sur le côté une fente longitudinale 5, et, d'autre part, de pièces coudées 11 et 12, d'un guide-fil 13 placé dans le nez 14 du tambour prédélivreur 2 et d'un oeillet guide-fil 15 placé à la sortie 16 du dispositif prédélivreur. La pièce coudée 11 établit une jonction entre le tube 4 et le tube d'enroulement 1, et la pièce coudée 12 réalise une transition du tube 4 vers le guide-fil 13 dans le nez 14.The wire guide 3, as illustrated in FIG. 1, is composed, on the one hand, of the tube 4 mentioned above, extending longitudinally along the surface 10 of the pre-delivery drum 2 and having on the side a longitudinal slot 5, and, on the other hand, bent parts 11 and 12, a thread guide 13 placed in the nose 14 of the pre-delivery drum 2 and a thread guide eyelet 15 placed at the outlet 16 of the pre-delivery device. The bent part 11 establishes a junction between the tube 4 and the winding tube 1, and the bent part 12 makes a transition from the tube 4 to the wire guide 13 in the nose 14.

Le guide-fil 3 est doté d'un certain nombre de buses d'air 17, 18 et 19 disposées par exemple dans les pièces coudées 11 et 12 et dans l'oeillet guide-fil 15. L'entrée 20 du tube d'enroulement 1 est également doté d'une buse d'air 21.The wire guide 3 is provided with a number of air nozzles 17, 18 and 19 arranged for example in the bent pieces 11 and 12 and in the wire guide eyelet 15. The inlet 20 of the tube winding 1 also has an air nozzle 21.

Les buses d'air 17, 18, 19 et 21 sont alimentées par une source d'air comprimé 22 et peuvent être commandées par une vanne commandée 23.The air nozzles 17, 18, 19 and 21 are supplied by a source of compressed air 22 and can be controlled by a controlled valve 23.

Les brosses 8 mentionnées sont fixées dans un siège circulaire 24 et collaborent du côté de prélèvement 25 du tambour prédélivreur 2. Eventuellement, mais sans que cela soit absolument nécessaire, une broche à commande électromagnétique 26 peut être prévue pour empêcher le prélèvement du fil de trame 7 du tambour prédélivreur 2. En outre, le dispositif est pourvu de moyens 27 déterminant si le tube d'enroulement 1 est présenté devant la pièce coudée 11; ces moyens peuvent par exemple être constitués d'un détecteur. Ces moyens 27 peuvent interagir avec une unité de commande 28 pour commander les moyens d'entraînement 9 mentionnés ci-dessus, et disposant des moyens lui permettant de commander les moyens d'entraînement 9 de manière à ce que le tube d'enroulement 1 vienne se placer devant les moyens 27 et de la pièce coudée 11 du guide-fil. Cette unité de commande 28 peut également commander la broche à commande électromagnétique 26 et la vanne 23 mentionnée ci-dessus.The brushes 8 mentioned are fixed in a circular seat 24 and collaborate on the sampling side 25 of the pre-delivery drum 2. Optionally, but without this being absolutely necessary, an electromagnetically controlled spindle 26 can be provided to prevent the weft yarn from being picked up. 7 of the pre-delivery drum 2. In addition, the device is provided with means 27 determining whether the winding tube 1 is presented in front of the bent part 11; these means can for example consist of a detector. These means 27 can interact with a control unit 28 to control the drive means 9 mentioned above, and having means enabling it to control the drive means 9 so that the winding tube 1 comes stand in front of the means 27 and the bent part 11 of the wire guide. This control unit 28 can also control the electromagnetically controlled spindle 26 and the valve 23 mentioned above.

La présente invention est caractérisée par le fait que le dispositif prédélivreur est pourvu d'éléments guide-fil 29 empêchant qu'un fil de trame 7 présent dans le tube 4 ne quitte ce tube 4 par la fente 5 lorsqu'une traction est exercée sur ce fil de trame 7 depuis la sortie 16; cette caractéristique offrant l'avantage que le fil de trame 7 ne peut quitter le tube 4 sous l'action d'une telle traction, ce qui a notamment pour effet de permettre le transport plus avant du fil de trame 7 sans que celui-ci ne soit tiré au travers des brosses 8.The present invention is characterized in that the pre-delivery device is provided with thread guide elements 29 preventing a weft thread 7 present in the tube 4 from leaving this tube 4 through the slot 5 when traction is exerted on this weft thread 7 from the outlet 16; this characteristic offering the advantage that the weft yarn 7 cannot leave the tube 4 under the action of such traction, which in particular has the effect of allowing further transport of the weft yarn 7 without it be pulled through the brushes 8.

Comme illustré aux figures 2 à 6, ces éléments guide-fil 29 seront, dans une forme d'exécution préférentielle, une extrémité en forme de lèvre de la paroi du tube 4 à hauteur du côté de prélèvement 25 du tambour prédélivreur 2. Comme illustré aux figures 2 à 5, cette extrémité en forme de lèvre fait en quelque sorte une saillie, empêchant, lorsque une traction K est exercée sur le fil de trame 7, que celui-ci quitte le tube 4 par la fente 5, étant donné que l'extrémité en forme de lèvre fait saillie d'une distance D1 par rapport à l'endroit 30 où le fil de trame 7 quitte le tube 4.As illustrated in FIGS. 2 to 6, these thread guide elements 29 will, in a preferred embodiment, a lip-shaped end of the wall of the tube 4 at the level of the sampling side 25 of the pre-delivery drum 2. As illustrated in FIGS. 2 to 5, this lip-shaped end protrudes in a way, preventing, when a traction K is exerted on the weft thread 7, that it leaves the tube 4 by the slot 5, since the lip-shaped end protrudes by a distance D1 from the place 30 where the weft thread 7 leaves the tube 4.

Comme illustré à la figure 6, à cette fin le mouvement du fil de trame 7 est également empêché par le fait que le bord inférieur 31 de la fente 5 se trouve à une distance D2 au-dessus du bord intérieur 32, et plus particulièrement le bord du tube 4 le plus proche de la surface 10 du tambour prédélivreur 2.As illustrated in FIG. 6, for this purpose the movement of the weft thread 7 is also prevented by the fact that the lower edge 31 of the slot 5 is at a distance D2 above the inner edge 32, and more particularly the edge of the tube 4 closest to the surface 10 of the pre-delivery drum 2.

L'enfilage du dispositif prédélivreur est obtenu en positionnant le tube d'enroulement 1 devant la pièce coudée 11; en présentant, manuellement ou automatiquement, un fil de trame 7 devant l'entrée 20; en alimentant les buses d'air 17, 18, 19, et 21 en air comprimé par l'intermédiaire de la vanne 23. Le fil de trame 7 est ainsi soufflé au travers du dispositif prédélivreur en suivant un trajet tel que celui repéré par X à la figure 1.The threading of the pre-delivery device is obtained by positioning the winding tube 1 in front of the bent piece 11; by presenting, manually or automatically, a weft thread 7 in front of the inlet 20; by supplying the air nozzles 17, 18, 19, and 21 with compressed air via the valve 23. The weft thread 7 is thus blown through the pre-delivery device following a path such as that marked by X in Figure 1.

Dès l'arrêt de la soufflerie et dès qu'une traction est exercée sur le fil de trame 7 depuis la sortie 16, celui-ci prend une position telle que repérée par Y. Cette traction peut être manuelle ou résulter de l'utilisation d'une buse d'air ou d'un dispositif similaire.As soon as the blower stops and as soon as traction is exerted on the weft thread 7 from the outlet 16, the latter takes a position as marked by Y. This traction can be manual or result from the use of '' an air nozzle or similar device.

Selon une vue identique à celle de la figure 5, la figure 7 représente une variante dans laquelle les éléments guide-fil 29 sont constitués d'une découpe dans la paroi du tube 4, à hauteur de la partie intérieure 6.According to a view identical to that of FIG. 5, FIG. 7 represents a variant in which the wire guide elements 29 consist of a cut in the wall of the tube 4, up to the interior part 6.

Il est à noter que le tube 4 et les pièces coudées 11 et 12, telles que représentées aux figures 1 à 6, peuvent être réalisées sous la forme d'une pièce monobloc. Dans ce cas, le tube 4 est fixé, comme illustré à la figure 8, au moyen d'un appui amovible 33 au bâti 34 du dispositif prédélivreur. Le bâti 34 et le siège 24 des brosses 8 présentent un passage 35 qui permet d'amener le fil de trame 7 sur le tambour prédélivreur 2.It should be noted that the tube 4 and the bent pieces 11 and 12, as shown in Figures 1 to 6, can be made in the form of a single piece. In this case, the tube 4 is fixed, as illustrated in FIG. 8, by means of a removable support 33 to the frame 34 of the pre-delivery device. The frame 34 and the seat 24 of the brushes 8 have a passage 35 which allows the weft thread 7 to be brought to the pre-delivery drum 2.

La figure 9 représente une variante selon l'invention dans laquelle le bâti circulaire 34 est d'une pièce non interrompue, ce qui lui confère une plus grande solidité de construction. Pour faciliter le montage du tube 4 précité dans le bâti 34, les pièces coudées 11 et 12 sont, comme illustré à la figure 10, des pièces séparées. Il est évident que ces pièces coudées 11 et 12, réalisées en pièces séparées, sont disposées dans le prolongement du tube 4.FIG. 9 represents a variant according to the invention in which the circular frame 34 is of an uninterrupted part, which gives it greater solidity of construction. To facilitate the mounting of the aforementioned tube 4 in the frame 34, the bent parts 11 and 12 are, as illustrated in FIG. 10, separate parts. It is obvious that these bent pieces 11 and 12, produced in separate pieces, are arranged in the extension of the tube 4.

L'invention a également trait à une méthode permettant d'enfiler un dispositif prédélivreur, et plus particulièrement un dispositif prédélivreur du type décrit ci-dessus. Selon cette méthode, la sortie du tube d'enroulement 1 est placée, comme mentionné ci-dessus, devant l'entrée du guide-fil 3, un fil de trame 7 est introduit dans le guide-fil 3 et, au moment voulu, ce fil de trame 7 est extrait du tube 4 mentionné en tournant l'un par rapport à l'autre le tube d'enroulement 1 et le guide-fil 3, dans un sens qui permet au fil de trame 7 de passer par-dessus le bord inférieur 31 en partant de l'entrée du tube 4. L'extraction du fil de trame 7 du tube 4 est repérée par Z à la figure 1. Pour cela, le tube d'enroulement 1 est tourné sous l'action des moyens d'entraînement 9 placés sous le contrôle de l'unité de commande 28.The invention also relates to a method for threading a pre-delivery device, and more particularly a pre-delivery device of the type described above. According to this method, the outlet of the winding tube 1 is placed, as mentioned above, in front of the inlet of the thread guide 3, a weft thread 7 is introduced into the thread guide 3 and, at the desired time, this weft thread 7 is extracted from the mentioned tube 4 by turning the winding tube 1 and the thread guide 3 in relation to the other, in a direction which allows the weft thread 7 to pass over the lower edge 31 starting from the inlet of the tube 4. The extraction of the weft thread 7 from the tube 4 is identified by Z in FIG. 1. For this, the winding tube 1 is turned under the action of the drive means 9 placed under the control of the control unit 28.

Pour faciliter l'extraction du fil de trame 7 du tube 4, il est possible de prévoir un chanfrein 36 au bord inférieur 31, à l'entrée du tube 4, comme illustré en particulier à la figure 3.To facilitate the extraction of the weft thread 7 from the tube 4, it is possible to provide a chamfer 36 at the lower edge 31, at the inlet of the tube 4, as illustrated in particular in FIG. 3.

La présente invention est donc également caractérisée par le fait qu'un fil de trame 7 introduit dans le tube 4 ne peut quitter ce tube 4 par la fente 5 que lorsque le tube d'enroulement 1 est tourné, ce qui offre l'avantage que le fil de trame 7 ne quittera le tube 4 qu'au moment opportun.The present invention is therefore also characterized in that a weft thread 7 introduced into the tube 4 can leave this tube 4 through the slot 5 only when the winding tube 1 is rotated, which offers the advantage that the weft thread 7 will not leave the tube 4 until the opportune moment.

Bien que le fil de trame 7, dans la forme d'exécution présentée, soit soufflé au travers du tube d'enroulement 1 et du guide-fil 3, il n'est pas exclu que le fil puisse être amené selon une méthode différente, par exemple en utilisant un passe-fil, système par lequel le fil est serré dans un crochet et tiré par un lien souple au travers du tube d'enroulement 1 et du guide-fil 3.Although the weft thread 7, in the embodiment shown, is blown through the winding tube 1 and the thread guide 3, it is not excluded that the thread can be brought in by a different method, for example by using a grommet, system by which the thread is clamped in a hook and pulled by a flexible link through the winding tube 1 and the thread guide 3.

La présente invention ne se limite nullement aux formes d'exécution décrites dans les exemples et illustrées aux figures annexées; au contraire, un tel dispositif prédélivreur pourra être réalisé selon différentes formes et dimensions sans quitter le cadre de l'invention revendiquée.The present invention is in no way limited to the embodiments described in the examples and illustrated in the appended figures; on the contrary, such a pre-delivery device can be produced in different shapes and dimensions without departing from the scope of the claimed invention.

Claims (7)

  1. Accumulator device for weaving machines, consisting of an accumulator drum (2), a winding tube (1), drive means (9) to make the winding tube (1) and the accumulator drum (2) turn in relation to one another, as well as a thread guide (3) which extends along the accumulator drum (2) and of which at least a part is formed of a tube (4) containing a longitudinal slit (5), characterized in that the accumulator device is provided with thread guide elements (29) which prevent that a weft thread (7) which has passed through the thread guide (3) leaves the tube (4) via the slit (5) when the thread is being pulled at at the outlet (16) of the accumulator device.
  2. Accumulator device according to claim 1, characterized in that the thread guide elements (29) have a lip-shaped end provided in the wall of the tube (4) at the height of the take-up side (25) of the accumulator drum (2) and the inner part (6) of the tube (4).
  3. Accumulator device according to any of claims 1 or 2, characterized in that the thread guide elements (29) are realized according to the following configuration: the lower edge (31) of the slit (5) is situated at a greater radial distance from the accumulator drum (2) than the inside edge (32) of the tube (4) situated nearest to the accumulator drum (2).
  4. Accumulator device according to claim 1, characterized in that the thread guide elements (29) consist of a cutout in the wall of the tube (4), at the height of the take-up side (25) of the accumulator drum (2) and the interior part (6) of the tube (4).
  5. Accumulator device according to any of the above claims, characterized in that the lower edge (31) of the slit (5) is provided with a chamfer (36) at the inlet of the tube (4).
  6. Accumulator device according to any of the above claims, characterized in that it is provided with drive means (9) to make the winding tube (1) and the thread guide (3) move in relation to one another, as well as with a control unit (28) which controls these drive means (9) such that a weft thread (7) which is inserted in the above-mentioned tube (4) is pulled out of the tube (4) via the slit (5) as of the inlet of the tube (4) when the above-mentioned move is carried out.
  7. Method for threading an accumulator device for weaving machines of the type containing a drum (2), consisting of the following successive operations: the transport, of a weft thread (7) to be threaded, through a winding tube (1) and a thread guide (3) which extends along the accumulator drum (2), and of which at least a part consists of a tube (4) containing a longitudinal slit (5), characterized in that the weft thread (7) is guided through a tube (4) as well as along thread guide elements (29) which prevent said weft thread (7) from leaving the tube (4) via the slit (5) when this weft thread (7) is being pulled at at the outlet (16) of the accumulator device; and, at a given moment, the moving of the winding tube (1) and the thread guide (3) in relation to one another, such that the weft thread (7) is pulled from the tube (4) via the slit (5) as of the inlet of this tube (4) and is applied onto the accumulator drum (2).
EP19910200596 1990-04-04 1991-03-19 Prewinder for looms and method for threading such prewinder Expired - Lifetime EP0450686B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000375A BE1003986A3 (en) 1990-04-04 1990-04-04 Before winding device for looms and method for wiring of such before winding device.
BE9000375 1990-04-04

Publications (2)

Publication Number Publication Date
EP0450686A1 EP0450686A1 (en) 1991-10-09
EP0450686B1 true EP0450686B1 (en) 1994-09-28

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EP19910200596 Expired - Lifetime EP0450686B1 (en) 1990-04-04 1991-03-19 Prewinder for looms and method for threading such prewinder

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EP (1) EP0450686B1 (en)
BE (1) BE1003986A3 (en)
DE (1) DE69104254T2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT226136Y1 (en) * 1991-09-19 1997-04-18 Roy Electrotex Spa BUILDING IMPROVEMENTS FOR WEAVING FRAME FOR WEAVING FRAMES.
IT1259551B (en) * 1992-04-22 1996-03-20 Lgl Electronics Spa ELECTRO-PNEUMATIC DEVICE FOR AUTOMATIC THREADING OF WEFT FEEDERS WITH TEXTILE MACHINES AND WEFT FEEDER INCORPORATING SAID DEVICE
DE4319960A1 (en) * 1993-06-16 1994-12-22 Iro Ab Device for guiding and braking a thread
ITTO20010569A1 (en) * 2001-06-14 2002-12-14 Lgl Electronics Spa DEVICE OF REGULARIZATION OF THE DEVELOPMENT OF THE SPOOLS OF FILODELLA THE WEFT RESERVE, FROM THE DRUM OF THE WEFT FEEDERS FOR YOU

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE83273T1 (en) * 1987-09-25 1992-12-15 Iro Ab THREAD STORAGE AND DELIVERY DEVICE.
CH680863A5 (en) * 1989-03-17 1992-11-30 Sulzer Ag

Also Published As

Publication number Publication date
EP0450686A1 (en) 1991-10-09
BE1003986A3 (en) 1992-07-28
DE69104254D1 (en) 1994-11-03
DE69104254T2 (en) 1995-02-16

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