EP0446150B1 - Device for automatically unweaving on looms with mechanical weft insertion means - Google Patents

Device for automatically unweaving on looms with mechanical weft insertion means Download PDF

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Publication number
EP0446150B1
EP0446150B1 EP91420057A EP91420057A EP0446150B1 EP 0446150 B1 EP0446150 B1 EP 0446150B1 EP 91420057 A EP91420057 A EP 91420057A EP 91420057 A EP91420057 A EP 91420057A EP 0446150 B1 EP0446150 B1 EP 0446150B1
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EP
European Patent Office
Prior art keywords
pick
defective
weft
waste
fabric
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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
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EP91420057A
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German (de)
French (fr)
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EP0446150A1 (en
Inventor
Pierre Pierson
Roger Fourneaux
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ICBT Diederichs SAS
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Saurer Diederichs SA
ICBT Diederichs SAS
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Publication of EP0446150A1 publication Critical patent/EP0446150A1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • D03D51/085—Extraction of defective weft

Definitions

  • the present invention relates to a unwinding device, that is to say a device which, on a weaving machine, ensures the extraction of a defective pick, to remove it from the fabric being formed.
  • the device in question automatically performs the stretching operation, after detection of a weft defect, in particular when an inserted pick is recognized as being broken, or of inappropriate length, by conventional detection means.
  • This invention relates, more particularly, to an automatic unwinding device, specially designed for weaving machines equipped with mechanical weft insertion members, in particular pliers which transfer the weft yarn, by exchanging it. 'One clamp to the other in the middle of the width of the fabric being formed.
  • the present invention overcomes these drawbacks by providing an automatic unwinding device for a weaving machine with a mechanical weft insertion member, as described in the claims.
  • the invention thus provides an automatic unwinding device particularly suitable for weaving machines equipped with mechanical weft insertion members.
  • the essential inventive idea consists in evacuating the defective pick and / or the weft waste, not in the direction of insertion, but in the opposite direction, that is to say by bringing them towards the "food" side. This makes it possible to avoid cutting the defective piece of the weft thread, and also makes it possible to maintain the part of the thread which follows the defective pick, so that the automatic restarting of the weaving machine is facilitated.
  • the pneumatic means for "taking off” of the defective pick and / or weft waste consist, advantageously, of an air injector movable in translation in the direction of the width of the fabric, over the entire width of this fabric.
  • These pneumatic "take-off” means are advantageously provided for bringing the defective pick and / or the weft waste into the channel delimited by the comb of the weaving machine and by the two layers of warp threads, while the pneumatic means d evacuation intervening after the "take off” of the defective pick and / or of the frame waste, use said channel as a pneumatic guide.
  • These pneumatic evacuation means preferably comprise a series of evacuation nozzles distributed over the width of the fabric and capable of emitting air jets oriented towards the "supply" side of the weaving machine. The discharge nozzles can be mounted on the supports of the guides intended for the mechanical insertion members of the weft.
  • the unwinding device also comprises, on the "feeding" side of the weaving machine, means for laterally deflecting the defective pick and / or the weft waste outside the zone crossed by the mechanical insertion members, and means for definitive elimination of the defective pick and / or weft waste.
  • the means for laterally deflecting the defective pick and / or the frame waste can be produced in the form of a deflection nozzle, while the means for definitive elimination of the defective pick and / or the waste are realizable in the form of '' a discharge nozzle, the inlet opening of which is situated opposite the deflection nozzle.
  • the automatic unwinding device thus ensures the complete elimination of defective picks and weft waste by simple and economical pneumatic means, added for this purpose on a fundamentally mechanical weaving machine.
  • the means for controlling the proper evacuation of the defective pick and / or weft waste are optical means housed inside the suction nozzle. These means make it possible in particular to control the presence of a defective pick during elimination, engaged in the suction nozzle, but not yet separated from the rest of the wire, the defective pick being then stretched between a fixed point, belonging for example to a weft selector, and the suction nozzle. The observation of the effective presence of this stretched defective pick causes an automatic restarting sequence of the weaving machine, with interception and resumption of the rest of the weft thread by a mechanical insertion member, and separation of the defective weft ensuring its final elimination by aspiration.
  • the weaving machine shown in the drawing comprises two movable members for mechanical insertion of the weft, constituted respectively by a first clamp 1, mounted at the free end of a first ribbon 2, and by a second clamp 3, mounted at the free end of a second strip 4.
  • the weft thread 5 comes from at least one supply spool 6, located on one side of the weaving machine, and it first passes over at least one pre-feeder 7.
  • several weft threads are supplied by supply coils 6 and pre-deliverers 7 in corresponding numbers, and these wires pass through eyelets 8 belonging to movable selection fingers 9, themselves controlled by a weft selector 10. Downstream of the selection fingers 9, the weft thread 5 passes over a separation finger 11, near which a scissor 12 is arranged - see also Figures 2 and following. All the components mentioned in this paragraph are located on the "feed" side of the weaving machine.
  • the machine Over the width of the fabric 13 being formed, the machine comprises, in a conventional manner, a comb 14 and heald frames 15, crossed by the plies of warp threads 16 and 17. Taking into account the nature of the organs of insertion of the weft, guides 18 are also provided for the ribbons 2 and 4, these guides 18 being carried by supports 19, clearly visible in FIG. 2, and being distributed over the width of the fabric 13. The false selvedges 20 of this fabric 13, pass over other guides 21 ( Figure 1).
  • the first clamp 1 drives the weft thread 5 to the middle of the width of the fabric 13, where an exchange takes place with the second clamp 3, which then takes the thread 5 with it, right up to the side of the machine opposite that of the feed.
  • the chisel 12 makes it possible to separate the inserted pick from the rest of the weft thread 5, after which the next pick can be inserted in the same way.
  • Detection means of the “weft breaker” type, of piezoelectric type, indicated diagrammatically at 22 in FIG. 1, detect the correct insertion, or if necessary defective, of the weft thread 5.
  • additional "untwisting" members are provided for the elimination, out of the tissue 13, of a pick recognized as defective by the detection means 22.
  • These essentially pneumatic members include, as shown in FIGS. 4 and following, an air injector 23, movable in translation in the direction of the width of the fabric 13, over the entire width of this fabric.
  • the displacement of the air injector 23 ensures the "take-off" of a defective pick, or of frame waste, by moving them away from the previously inserted picks.
  • the pneumatic stretching members also comprise, distributed over the width of the fabric 13, discharge nozzles 24, which can be mounted on the supports 19 of the guides 18 of the tapes 2 and 4, as shown in FIG. 2.
  • the jets d air from the exhaust nozzles 24 are directed in the width direction of the fabric 13, and they are all directed towards the "supply" side of the weaving machine.
  • the pneumatic stretching members finally comprise, on this "supply" side of the weaving machine, a deflection nozzle 25, located near the separation finger 11, and a suction nozzle 26, placed opposite the deflection 25.
  • Control photocells 27 are housed inside the suction nozzle 26, as shown in Figures 3 and following.
  • the air injector 23 After detecting a faulty insertion, as illustrated in FIG. 4, the air injector 23 describes a back-and-forth movement over the entire width of the fabric 13, as indicated in FIGS. 5 and 6; during this movement of the air injector 23, the defective pick 28 and / or the weft waste 29 are "peeled off" from the pick previously inserted, by the effect of air blowing.
  • Air jets 30 are then emitted in the channel delimited by the comb 14 and by the plies of warp threads 16 and 17
  • the defective pick 28 and / or the waste 29 are thus evacuated in this channel, in the direction of the "supply" side, therefore according to a movement in the opposite direction to that of the insertion.
  • the cells 27 check at this time the presence of the defective pick 28 and / or the passage of the waste 29 in the evacuation nozzle 26.
  • the defective weft 28 remains attached following the weft thread 5, and this defective weft 28 is finally stretched between a selection finger 9, the separation finger 11 and the suction nozzle 26, as shown in Figure 8, as well as in Figure 3.
  • the first clamp 1 grasps and drives the weft thread 5, while the chisel 12 definitively separates the defective pick 28, which has hitherto remained attached to the continuation of the thread. While the insertion of the next pick has already started, the suction nozzle 26 completes the evacuation of the defective weft 28, which is then completely eliminated - see FIG. 10.
  • the invention is not limited to the sole embodiment of this automatic unwinding device for weaving machines with mechanical wefts insertion devices, which has been described above, by way of example; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle.
  • the deflection nozzle could be directed differently, for example upwards or downwards, and moreover, the invention remains applicable to weaving machines in which the mechanical members for inserting the weft are other than pliers mounted at the end of ribbons.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Description

La présente invention concerne un dispositif de détissage, c'est-à-dire un dispositif qui, sur une machine à tisser, assure l'extraction d'une duite défectueuse, pour l'éliminer du tissu en cours de formation. Le dispositif en question assure de façon automatique l'opération de détissage, après détection d'un défaut de la trame, notamment lorsqu'une duite insérée est reconnue comme étant cassée, ou de longueur inappropriée, par les moyens de détection classiques. Cette invention s'intéresse, plus particulièrement, à un dispositif de détissage automatique, spécialement conçu pour des machines à tisser équipées d'organes d'insertion mécanique de la trame, notamment de pinces qui transfèrent le fil de trame, en l'échangeant d'une pince à l'autre au milieu de la largeur du tissu en cours de formation.The present invention relates to a unwinding device, that is to say a device which, on a weaving machine, ensures the extraction of a defective pick, to remove it from the fabric being formed. The device in question automatically performs the stretching operation, after detection of a weft defect, in particular when an inserted pick is recognized as being broken, or of inappropriate length, by conventional detection means. This invention relates, more particularly, to an automatic unwinding device, specially designed for weaving machines equipped with mechanical weft insertion members, in particular pliers which transfer the weft yarn, by exchanging it. 'One clamp to the other in the middle of the width of the fabric being formed.

On connaît déjà divers systèmes de détissage, appliqués à des machines à tisser avec insertion de la trame par des moyens pneumatiques; de façon générale, ces systèmes connus utilisent les organes pneumatiques d'insertion et de guidage de la trame, tels que buses principales, buses relais et peigne confineur formant un canal d'insertion, pour assurer aussi la fonction de détissage. A titre d'exemples, on peut citer ici les demandes de brevets européens publiées n° 0 309 013 et n° 0 318 861, ainsi que la demande de brevet européen publiée n° 0 344 076, au nom de la Demanderesse.Various stretching systems are already known, applied to weaving machines with insertion of the weft by pneumatic means; generally, these known systems use the pneumatic members for inserting and guiding the weft, such as main nozzles, relay nozzles and confining comb forming an insertion channel, to also perform the unscrewing function. By way of examples, mention may be made here of published European patent applications No. 0 309 013 and No. 0 318 861, as well as published European patent application No. 0 344 076, in the name of the Applicant.

Dans le document EP-A-0 332 258, on a proposé un métier à insertion mécanique (voir notamment figures 28 à 44) dans lequel on peut retirer la duite défectueuse côté alimentation grâce à des moyens mécaniques qui coopèrent avec la pince d'insertion. Cette disposition purement mécanique permet de retirer avec succès une duite coupée en deux morceaux, mais est totalement inefficace lorsque la duite est coupée en plusieurs morceaux, par suite de l'impossibilité de séparer, puis retirer la duite détectueuse.In document EP-A-0 332 258, a loom with mechanical insertion has been proposed (see in particular FIGS. 28 to 44) in which the defective pick can be removed on the feed side by mechanical means which cooperate with the insertion clamp. . This purely mechanical arrangement makes it possible to successfully remove a pick cut into two pieces, but is completely ineffective when the pick is cut into several pieces, due to the impossibility of separating and then removing the detecting pick.

La présente invention pallie ces inconvénients en fournissant un dispositif de détissage automatique pour machine à tisser avec organe d'insertion mécanique de la trame, tel que décrit dans les revendications.The present invention overcomes these drawbacks by providing an automatic unwinding device for a weaving machine with a mechanical weft insertion member, as described in the claims.

Tout en utilisant des moyens pneumatiques partiellement connus en soi, l'invention fournit ainsi un dispositif de détissage automatique particulièrement adapté aux machines à tisser équipées d'organes d'insertion mécanique de la trame. A cet égard, l'idée inventive essentielle consiste à évacuer la duite défectueuse et/ou les déchets de trame, non pas dans le sens de l'insertion, mais en sens opposé, c'est-à-dire en les ramenant vers le côté "alimentation". Ceci permet d'éviter de couper le morceau défectueux du fil de trame, et permet aussi de maintenir la partie du fil qui fait suite à la duite défectueuse, de sorte que le redémarrage automatique de la machine à tisser se trouve facilité.While using pneumatic means partially known per se, the invention thus provides an automatic unwinding device particularly suitable for weaving machines equipped with mechanical weft insertion members. In this respect, the essential inventive idea consists in evacuating the defective pick and / or the weft waste, not in the direction of insertion, but in the opposite direction, that is to say by bringing them towards the "food" side. This makes it possible to avoid cutting the defective piece of the weft thread, and also makes it possible to maintain the part of the thread which follows the defective pick, so that the automatic restarting of the weaving machine is facilitated.

Les moyens pneumatiques de "décollage" de la duite défectueuse et/ou des déchets de trame sont constitués, avantageusement, par un injecteur d'air mobile en translation dans la direction de la largeur du tissu, sur toute la largeur de ce tissu. Ces moyens pneumatiques de "décollage" sont avantageusement prévus pour amener la duite défectueuse et/ou les déchets de trame dans le canal délimité par le peigne de la machine à tisser et par les deux nappes de fils de chaîne, tandis que les moyens pneumatiques d'évacuation intervenant après le "décollage" de la duite défectueuse et/ou des déchets de trame, utilisent ledit canal comme guide pneumatique. Ces moyens pneumatiques d'évactuation comprennent, de préférence, une serie de buses d'évacuation réparties sur la largeur de tissu et aptes à émettre des jets d'air orientés vers le côté "alimentation" de la machine à tisser. Les buses d'évacuation peuvent être montées sur les supports des guides destinés aux organes d'insertion mécanique de la trame.The pneumatic means for "taking off" of the defective pick and / or weft waste consist, advantageously, of an air injector movable in translation in the direction of the width of the fabric, over the entire width of this fabric. These pneumatic "take-off" means are advantageously provided for bringing the defective pick and / or the weft waste into the channel delimited by the comb of the weaving machine and by the two layers of warp threads, while the pneumatic means d evacuation intervening after the "take off" of the defective pick and / or of the frame waste, use said channel as a pneumatic guide. These pneumatic evacuation means preferably comprise a series of evacuation nozzles distributed over the width of the fabric and capable of emitting air jets oriented towards the "supply" side of the weaving machine. The discharge nozzles can be mounted on the supports of the guides intended for the mechanical insertion members of the weft.

Dans une forme de réalisation préférée de l'invention, le dispositif de détissage comprend encore, sur le côté "alimentation" de la machine à tisser, des moyens pour dévier latéralement la duite défectueuse et/ou les déchets de trame hors de la zone traversée par les organes d' insertion mécanique, et des moyens d'élimination définitive de la duite défectueuse et/ou des déchets de trame. Les moyens pour dévier latéralement la duite défectueuse et/ou les déchets de trame sont réalisables sous la forme d'une buse de déviation, tandis que les moyens d'élimination définitive de la duite défectueuse et/ou des déchets sont réalisables sous la forme d'une buse d'évacuation, dont l'ouverture d'entrée est située en regard de la buse de déviation.In a preferred embodiment of the invention, the unwinding device also comprises, on the "feeding" side of the weaving machine, means for laterally deflecting the defective pick and / or the weft waste outside the zone crossed by the mechanical insertion members, and means for definitive elimination of the defective pick and / or weft waste. The means for laterally deflecting the defective pick and / or the frame waste can be produced in the form of a deflection nozzle, while the means for definitive elimination of the defective pick and / or the waste are realizable in the form of '' a discharge nozzle, the inlet opening of which is situated opposite the deflection nozzle.

Dans l'ensemble, le dispositif de détissage automatique selon l'invention, assure ainsi l'élimination complète des duites défectueuses et des déchets de trame par des moyens pneumatiques simples et économiques, ajoutés à cet effet sur une machine à tisser fondamentalement mécanique.Overall, the automatic unwinding device according to the invention thus ensures the complete elimination of defective picks and weft waste by simple and economical pneumatic means, added for this purpose on a fundamentally mechanical weaving machine.

Selon une caractéristique supplémentaire de l'invention, les moyens de contrôle de la bonne évacuation de la duite défectueuse et/ou des déchets de trame, sont des moyens optiques logés à l'intérieur de la buse d'aspiration. Ces moyens permettent notamment de contrôler la présence d'une duite défectueuse en cours d'élimination, engagée dans la buse d'aspiration, mais non-encore séparée de la suite du fil, la duite défectueuse étant alors tendue entre un point fixe, appartenant par exemple à un sélecteur de trame, et la buse d'aspiration. La constatation de la présence effective de cette duite défectueuse tendue, provoque une séquence automatique de redémarrage de la machine à tisser, avec interception et reprise de la suite du fil de trame par un organe d'insertion mécanique, et séparation de la trame défectueuse assurant son élimination définitive par aspiration.According to an additional characteristic of the invention, the means for controlling the proper evacuation of the defective pick and / or weft waste are optical means housed inside the suction nozzle. These means make it possible in particular to control the presence of a defective pick during elimination, engaged in the suction nozzle, but not yet separated from the rest of the wire, the defective pick being then stretched between a fixed point, belonging for example to a weft selector, and the suction nozzle. The observation of the effective presence of this stretched defective pick causes an automatic restarting sequence of the weaving machine, with interception and resumption of the rest of the weft thread by a mechanical insertion member, and separation of the defective weft ensuring its final elimination by aspiration.

De toute façon, l'invention sera mieux comprise, à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemple non-limitatif, une forme d'exécution de ce dispositif de détissage automatique pour machines à tisser avec organes d'insertion mécanique de la trame :

  • Figure 1 est une vue très schématique, en perspective, d'une machine à tisser équipée d'organes d'insertion mécanique de la trame ;
  • Figure 2 est une vue, en perspective partielle, de la machine, montrant une partie des organes pneumatiques du dispositif de détissage automatique ;
  • Figure 3 en est une autre vue partielle, en perspective, sous un autre angle ;
  • Figures 4 à 10 sont des vues très schématiques, illustrant le fonctionnement du dispositif de détissage automatique, objet de l'invention.
In any case, the invention will be better understood, with the aid of the description which follows, with reference to the appended schematic drawing representing, by way of non-limiting example, an embodiment of this automatic unwinding device for weaving machines with mechanical weft insertion members:
  • Figure 1 is a very schematic perspective view of a weaving machine equipped with mechanical weft insertion members;
  • Figure 2 is a view, in partial perspective, of the machine, showing a part of the pneumatic members of the loosening device automatic;
  • Figure 3 is another partial view, in perspective, from another angle;
  • Figures 4 to 10 are very schematic views illustrating the operation of the automatic unwinding device, object of the invention.

Comme le montre notamment la figure 1, la machine à tisser représentée au dessin comprend deux organes mobiles d' insertion mécanique de la trame, constitués respectivement par une première pince 1, montée à l'extrémité libre d'un premier ruban 2, et par une seconde pince 3, montée à l'extrémité libre d'un second ruban 4.As shown in particular in Figure 1, the weaving machine shown in the drawing comprises two movable members for mechanical insertion of the weft, constituted respectively by a first clamp 1, mounted at the free end of a first ribbon 2, and by a second clamp 3, mounted at the free end of a second strip 4.

Le fil de trame 5 provient d'au moins une bobine d'alimentation 6, située sur un côté de la machine à tisser, et il passe d'abord sur au moins un prédélivreur 7. En pratique, plusieurs fils de trame sont fournis par des bobines d'alimentation 6 et des prédélivreurs 7 en nombre correspondant, et ces fils passent au travers d'oeillets 8 appartenant à des doigts mobiles de sélection 9, eux-mêmes commandés par un sélecteur de trame 10. En aval des doigts de sélection 9, le fil de trame 5 passe sur un doigt de séparation 11, à proximité duquel est disposé un ciseau 12 - voir aussi les figures 2 et suivantes. Tous les organes mentionnés dans ce paragraphe sont situés sur le côté "alimentation" de la machine à tisser.The weft thread 5 comes from at least one supply spool 6, located on one side of the weaving machine, and it first passes over at least one pre-feeder 7. In practice, several weft threads are supplied by supply coils 6 and pre-deliverers 7 in corresponding numbers, and these wires pass through eyelets 8 belonging to movable selection fingers 9, themselves controlled by a weft selector 10. Downstream of the selection fingers 9, the weft thread 5 passes over a separation finger 11, near which a scissor 12 is arranged - see also Figures 2 and following. All the components mentioned in this paragraph are located on the "feed" side of the weaving machine.

Sur la largeur du tissu 13 en cours de formation, la machine comprend, de façon classique, un peigne 14 et des cadres de lisses 15, traversés par les nappes de fils de chaîne 16 et 17. Compte tenu de la nature des organes d'insertion de la trame, on prévoit encore des guides 18 pour les rubans 2 et 4, ces guides 18 étant portés par des supports 19, bien visibles à la figure 2, et étant répartis sur la largeur du tissu 13. Les fausses lisières 20 de ce tissu 13, passent sur d'autres guides 21 (figure 1).Over the width of the fabric 13 being formed, the machine comprises, in a conventional manner, a comb 14 and heald frames 15, crossed by the plies of warp threads 16 and 17. Taking into account the nature of the organs of insertion of the weft, guides 18 are also provided for the ribbons 2 and 4, these guides 18 being carried by supports 19, clearly visible in FIG. 2, and being distributed over the width of the fabric 13. The false selvedges 20 of this fabric 13, pass over other guides 21 (Figure 1).

Dans le fonctionnement normal de la machine à tisser, la première pince 1 entraîne le fil de trame 5 jusqu'au milieu de la largeur du tissu 13, où s'effectue un échange avec la deuxième pince 3, qui emmène ensuite le fil 5 avec elle, jusque sur le côté de la machine opposé à celui de l'alimentation. Le ciseau 12 permet de séparer la duite insérée, du restant du fil de trame 5, après quoi la duite suivante peut être insérée de la même manière. Des moyens de détection, du genre "casse-trame", de type piézo-électrique, indiqués schématiquement en 22 sur la figure 1, détectent l'insertion correcte, ou le cas échéant défectueuse, du fil de trame 5.In normal operation of the weaving machine, the first clamp 1 drives the weft thread 5 to the middle of the width of the fabric 13, where an exchange takes place with the second clamp 3, which then takes the thread 5 with it, right up to the side of the machine opposite that of the feed. The chisel 12 makes it possible to separate the inserted pick from the rest of the weft thread 5, after which the next pick can be inserted in the same way. Detection means, of the “weft breaker” type, of piezoelectric type, indicated diagrammatically at 22 in FIG. 1, detect the correct insertion, or if necessary defective, of the weft thread 5.

Selon l'invention, des organes additionnels de "détissage" sont prévus pour l'élimination, hors du tissu 13, d'une duite reconnue comme défectueuse par les moyens de détection 22.According to the invention, additional "untwisting" members are provided for the elimination, out of the tissue 13, of a pick recognized as defective by the detection means 22.

Ces organes, essentiellement pneumatiques, comprennent, comme le montrent les figures 4 et suivantes, un injecteur d'air 23, mobile en translation dans la direction de la largeur du tissu 13, sur toute la largeur de ce tissu. Le déplacement de l'injecteur d'air 23 assure le "décollage" d'une duite défectueuse, ou de déchets de trame, en les éloignant des duites précédemment insérées. Pour une description plus précise d'un tel injecteur d'air 13, ainsi que de ses moyens de commande et d'alimentation en air comprimé, on se reportera utilement à la demande de brevet européen publiée n° 0 344 076, au nom de la Demanderesse.These essentially pneumatic members include, as shown in FIGS. 4 and following, an air injector 23, movable in translation in the direction of the width of the fabric 13, over the entire width of this fabric. The displacement of the air injector 23 ensures the "take-off" of a defective pick, or of frame waste, by moving them away from the previously inserted picks. For a more precise description of such an air injector 13, as well as its means of control and supply of compressed air, reference will usefully be made to the published European patent application No. 0 344 076, in the name of the Applicant.

Les organes pneumatiques de détissage comprennent encore, réparties sur la largeur du tissu 13, des buses d'évacuation 24, qui peuvent être montées sur les supports 19 des guides 18 des rubans 2 et 4, comme montré à la figure 2. Les jets d'air, issus des buses d'évacuation 24, sont dirigés selon le sens de la largeur du tissu 13, et ils sont tous orientés vers le côté "alimentation" de la machine à tisser.The pneumatic stretching members also comprise, distributed over the width of the fabric 13, discharge nozzles 24, which can be mounted on the supports 19 of the guides 18 of the tapes 2 and 4, as shown in FIG. 2. The jets d air from the exhaust nozzles 24 are directed in the width direction of the fabric 13, and they are all directed towards the "supply" side of the weaving machine.

Les organes pneumatiques de détissage comprennent enfin, sur ce côté "alimentation" de la machine à tisser, une buse de déviation 25, située à proximité du doigt de séparation 11, et une buse d'aspiration 26, placée en regard de la buse de déviation 25. Des cellules photoélectriques de contrôle 27 sont logées à l'intérieur de la buse d'aspiration 26, comme le montrent les figures 3 et suivantes.The pneumatic stretching members finally comprise, on this "supply" side of the weaving machine, a deflection nozzle 25, located near the separation finger 11, and a suction nozzle 26, placed opposite the deflection 25. Control photocells 27 are housed inside the suction nozzle 26, as shown in Figures 3 and following.

Après détection d'une insertion défectueuse, telle qu'illustrée par la figure 4, l'injecteur d'air 23 décrit un mouvement d'aller-retour sur toute la largeur du tissu 13, comme indiqué aux figures 5 et 6 ; au cours de ce mouvement de l'injecteur d'air 23, la duite défectueuse 28 et/ou les déchets de trame 29 sont "décollés" de la duite précédemment insérée, par l'effet du soufflage d'air.After detecting a faulty insertion, as illustrated in FIG. 4, the air injector 23 describes a back-and-forth movement over the entire width of the fabric 13, as indicated in FIGS. 5 and 6; during this movement of the air injector 23, the defective pick 28 and / or the weft waste 29 are "peeled off" from the pick previously inserted, by the effect of air blowing.

Ensuite, les buses d'évacuation 24 sont mises en action, cette phase étant illustrée par la figure 7. Des jets d'air 30 sont alors émis dans le canal délimité par le peigne 14 et par les nappes de fils de chaîne 16 et 17. La duite défectueuse 28 et /ou les déchets 29 sont ainsi évacués dans ce canal, en direction du côté "alimentation", donc selon un déplacement en sens opposé à celui de l'insertion.Then, the discharge nozzles 24 are put into action, this phase being illustrated in FIG. 7. Air jets 30 are then emitted in the channel delimited by the comb 14 and by the plies of warp threads 16 and 17 The defective pick 28 and / or the waste 29 are thus evacuated in this channel, in the direction of the "supply" side, therefore according to a movement in the opposite direction to that of the insertion.

La duite défectueuse 28 et/ou les déchets de trame 29, ramenés sur le côté "alimentation", sont déviés latéralement par la buse de déviation 25, vers la buse d'évacuation 26, dans l'ouverture d'entrée 31 de laquelle elles s'engagent. Les cellules 27 contrôlent à ce moment la présence de la duite défectueuse 28 et/ou le passage des déchets 29 dans la buse d'évacuation 26.The defective pick 28 and / or the weft waste 29, brought back to the "supply" side, is deflected laterally by the deflection nozzle 25, towards the discharge nozzle 26, in the inlet opening 31 of which they engage. The cells 27 check at this time the presence of the defective pick 28 and / or the passage of the waste 29 in the evacuation nozzle 26.

Pendant les phases opératoires précédemment décrites, la trame défectueuse 28 reste rattachée à la suite du fil de trame 5, et cette trame défectueuse 28 est finalement tendue entre un doigt de sélection 9, le doigt de séparation 11 et la buse d'aspiration 26, comme montré sur la figure 8, ainsi que sur la figure 3.During the operating phases described above, the defective weft 28 remains attached following the weft thread 5, and this defective weft 28 is finally stretched between a selection finger 9, the separation finger 11 and the suction nozzle 26, as shown in Figure 8, as well as in Figure 3.

Au redémarrage de la machine à tisser, illustré par la figure 9, la première pince 1 saisit et entraîne le fil de trame 5, tandis que le ciseau 12 sépare définitivement la duite défectueuse 28, restée jusque-là rattachée à la suite du fil. Alors que débute déjà l'insertion de la duite suivante, la buse d'aspiration 26 achève l'évacuation de la trame défectueuse 28, qui est alors entièrement éliminée - voir la figure 10.Upon restarting the weaving machine, illustrated in FIG. 9, the first clamp 1 grasps and drives the weft thread 5, while the chisel 12 definitively separates the defective pick 28, which has hitherto remained attached to the continuation of the thread. While the insertion of the next pick has already started, the suction nozzle 26 completes the evacuation of the defective weft 28, which is then completely eliminated - see FIG. 10.

Comme il va de soi, l'invention ne se limite pas à la seule forme d'exécution de ce dispositif de détissage automatique pour machines à tisser avec organes mécaniques d'insertion de la trame, qui a été décrite ci-dessus, à titre d'exemple ; elle en embrasse, au contraire, toutes les variantes de réalisation et d'application respectant le même principe. Ainsi, la buse de déviation pourraît être dirigée différemment, par exemple vers le haut ou vers le bas, et par ailleurs, l'invention reste applicable à des machines à tisser dans lesquelles les organes mécaniques d'insertion de la trame sont autres que des pinces montées à l'extrémité de rubans.It goes without saying that the invention is not limited to the sole embodiment of this automatic unwinding device for weaving machines with mechanical wefts insertion devices, which has been described above, by way of example; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle. Thus, the deflection nozzle could be directed differently, for example upwards or downwards, and moreover, the invention remains applicable to weaving machines in which the mechanical members for inserting the weft are other than pliers mounted at the end of ribbons.

Claims (3)

  1. Automatic deweaving system for a loom comprising:
    - supplying means (6-8) of a weft yarn (5) located on a side of the loom;
    - a mechanical inserting means (1-4) of the weft (5) into a shed defined by two webs of warp yarns (16,17) and a reed (14) to make a fabric (13), said means comprising guides (18) held on supports (19);
    characterized in that it also comprises:
    - pneumatical means for blowing a defective pick (28) and/or waste weft yarn (29) in order to space them from the previous inserted pick, to introduce it into said shed, consisting in an air jet nozzle (23) which is lateraly mobile in the direction of the width of the fabric (13) along all the width of said fabric;
    - a series fo discharging nozzles (24) across the width of the fabric (13) and into said insertion shed, held on the supports (19) of the guides (18), intended to emit jets (30) directed towards the "supply" side of the loom, in order to evacuate the defective pick (28) and/or the waste weft yarn (29) into said insertion shed acting as a pneumatic pick;
    - means (25) located on the "supply" side of the loom, to lateraly deviate the defective pick (28) and/or the waste weft yarns (29) outside of the zone crossed by the mechanical inserting means (1-4);
    - definitive disposal means (26) of the defective pick (28) and/or waste weft yams (29);
    - control means (27) of the correct discharging of the defective pick (28) and/or the waste weft yarns (29);
    - and monitoring means intervening when detecting an insertion default which, in connection with above control means (27), activate the pneumatical means (23,24) for blowing and evacuating and for restarting the loom or stopping it.
  2. Automatic deweaving system according to claim 1, characterized in that means to lateraly deviate the defective pick (28) and/or the waste weft yarns (29) comprise deflecting nozzle (25), when the definitive disposal means of the defective pick (28) and/or waste weft yams (29) comprise evacuating nozzles (26), the mouth (31) of which being located opposite to the deflecting nozzle (25).
  3. Automatic deweaving system according to claims 1 and 2, characterized in that control means of the correct discharging of the defective pick (28) and/or the waste weft yarns (29) comprise optical means (27) provided internally of the evacuating nozzle (26).
EP91420057A 1990-03-06 1991-02-20 Device for automatically unweaving on looms with mechanical weft insertion means Expired - Lifetime EP0446150B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR909003358A FR2659361B1 (en) 1990-03-06 1990-03-06 AUTOMATIC DETACHING DEVICE FOR WEAVING MACHINES WITH MECHANICAL WEFT INSERTION.
FR9003358 1990-03-06

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EP0446150A1 EP0446150A1 (en) 1991-09-11
EP0446150B1 true EP0446150B1 (en) 1995-08-23

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EP91420057A Expired - Lifetime EP0446150B1 (en) 1990-03-06 1991-02-20 Device for automatically unweaving on looms with mechanical weft insertion means

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US (1) US5090454A (en)
EP (1) EP0446150B1 (en)
JP (1) JPH04228655A (en)
CS (1) CS56691A2 (en)
DE (2) DE69112240T4 (en)
FR (1) FR2659361B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940009396A (en) * 1992-10-02 1994-05-20 고시바 헤이지 Separation device for bad weft in multicolor repia loom
IT1276828B1 (en) * 1995-10-06 1997-11-03 Somet Soc Mec Tessile METHOD FOR AUTOMATIC EXTRACTION OF DEFECTIVE WEFT THREADS FROM THE PITCH OF A PLIER LOOM
CN101106872B (en) * 1997-07-08 2010-06-23 伊比登株式会社 Printed wiring board and method of producing the same
DE502008001238D1 (en) * 2007-09-10 2010-10-14 Itema Switzerland Ltd Cutting device for a loom and method of operating the same
CZ2015939A3 (en) * 2015-12-28 2017-07-19 VĂšTS, a.s. A method of removing a weft which has been misplaced by the hydraulic picking in the shed of the hydraulic weaving machine and a device for its implementation
JP7077968B2 (en) * 2019-01-14 2022-05-31 株式会社豊田自動織機 Weft processing equipment for air jet looms

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Publication number Priority date Publication date Assignee Title
CH578070A5 (en) * 1973-10-20 1976-07-30 Dornier Gmbh Lindauer
NL8202215A (en) * 1982-06-01 1984-01-02 Rueti Te Strake Bv Rinse-free weaving machine, provided with means for removing faulty weft threads from the weaving box.
US4502512A (en) * 1982-07-21 1985-03-05 Seisakusho Kabushiki Kaisha Toyoda Jidoshokki Method for treating a weft yarn upon stoppage of a shuttleless loom and device for effecting the same
NL8204665A (en) * 1982-12-01 1984-07-02 Rueti Te Strake Bv Rinse-free weaving machine, provided with means for removing faulty weft threads from the weaving box.
NL8602827A (en) * 1986-11-07 1988-06-01 Picanol Nv METHOD FOR DETACHING ERROR IMPOSITION THREADS FROM WEAVING MACHINES AND APPARATUS USED THEREIN
BE1000904A4 (en) * 1987-09-04 1989-05-09 Picanol Nv Detaching incorrect weft threads on looms - using combination of pushing movement and air jet from blower in gap between warp threads
BE1001507A3 (en) * 1988-03-10 1989-11-14 Picanol Nv Method for removing from gaap los an incorrect woof wire portion of looms.
BE1001508A3 (en) * 1988-03-10 1989-11-14 Picanol Nv METHOD FOR REMOVING A FAULTY IMPOSITION THREAD OF WEAVING MACHINES.
FR2631980B1 (en) * 1988-05-25 1990-08-24 Saurer Diederichs Sa DEVICE FOR EXTRACTING A DEFECTIVE WEFT YARN ON A WEAVING MACHINE
CS275271B2 (en) * 1988-09-01 1992-02-19 Tovarny Textilnich Potreb Elit Device for choked and beaten-up weft removal on looms
FR2642769B1 (en) * 1989-02-07 1991-10-25 Saurer Diederichs Sa DEVICE FOR DETECTING WEFT FAULTS IN A WEAVING MACHINE

Also Published As

Publication number Publication date
FR2659361A1 (en) 1991-09-13
US5090454A (en) 1992-02-25
CS56691A2 (en) 1991-09-15
DE69112240T2 (en) 1996-02-01
EP0446150A1 (en) 1991-09-11
JPH04228655A (en) 1992-08-18
DE69112240T4 (en) 1996-04-25
DE69112240D1 (en) 1995-09-28
FR2659361B1 (en) 1994-07-29

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