EP0311206B1 - Procédé pour reprendre le tissage à partir d'une réserve de fil séparé après une cassure de chaîne et machine à tisser pour la mise en oeuvre de ce procédé - Google Patents

Procédé pour reprendre le tissage à partir d'une réserve de fil séparé après une cassure de chaîne et machine à tisser pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0311206B1
EP0311206B1 EP19880202182 EP88202182A EP0311206B1 EP 0311206 B1 EP0311206 B1 EP 0311206B1 EP 19880202182 EP19880202182 EP 19880202182 EP 88202182 A EP88202182 A EP 88202182A EP 0311206 B1 EP0311206 B1 EP 0311206B1
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EP
European Patent Office
Prior art keywords
thread
tension
warp
supply
separate
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
Application number
EP19880202182
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German (de)
English (en)
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EP0311206A1 (fr
Inventor
Henry Shaw
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Picanol NV
Original Assignee
Picanol NV
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Filing date
Publication date
Application filed by Picanol NV filed Critical Picanol NV
Publication of EP0311206A1 publication Critical patent/EP0311206A1/fr
Application granted granted Critical
Publication of EP0311206B1 publication Critical patent/EP0311206B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J1/00—Auxiliary apparatus combined with or associated with looms
    • D03J1/004—Detection and repair of broken warp yarns

Definitions

  • This invention concerns a method for carrying on weaving after a warp break, from a separate thread supply.
  • the invention also concerns a weaving machine which uses this method.
  • the invention has as its object a method by means of which the weaving process can be resumed in a very short space of time after it has been interrupted as a result of a break in a warp thread.
  • the above-mentioned method consists of joining the end of the broken thread, which is still attached to the cloth, to a thread from a separate thread supply, thus forming a new warp thread; and restarting the machine, while the new warp thread continues to be supplied from the separate thread supply, such that this new warp thread remains taut.
  • the method of the invention it is possible to carry on weaving as soon as the above-mentioned thread has been joined, without waiting for the break to be fully repaired, thus saving a great amount of time. While weaving continues from the separate thread supply, the second thread end, which is still attached to the warp beam, may or may not be located and if required joined to the thread from the separate thread supply.
  • Figs. 1 to 3 are schematic representations of a weaving machine, showing the conventional components such as the warp beam 1, the warp 2, the warp stop motion 3 with several rows of drop wires 4, the shed 5, the harnesses 6, the reed 7, the woven cloth 8, the cloth beam 9, and, also shown schematically, the main drive 10 of the weaving machine.
  • a thread 11 taken from a separate thread supply 12 which consists of e.g. a supply package mounted on the frame of the weaving machine; a thread tensioning mechanism 13 in order to maintain a certain tension in the thread 11; a thread-joining device 14; a mechanism 15 for locating and/or gripping the first thread end 17 of the broken warp thread 18 formed as a result of a thread break 16, i.e. the end still attached to the cloth 8; one or more clips 19 which can operate on the thread 11 from the separate thread supply 12; and finally a control unit 20 to control the operation of the above-mentioned components in a suitable manner.
  • a separate thread supply 12 which consists of e.g. a supply package mounted on the frame of the weaving machine
  • a thread tensioning mechanism 13 in order to maintain a certain tension in the thread 11
  • a thread-joining device 14 a mechanism 15 for locating and/or gripping the first thread end 17 of the broken warp thread 18 formed as a result of a thread break 16,
  • the thread-joining device 14 can be of any type, and may for example consist of a device for forming a welded splice or an automatically-positioned tying-in device of the type described in German patent No. 599.681.
  • the above-mentioned mechanism 15 consists for example of a series of nozzles 21 with which the first thread end 17 can be picked out of the warp 2 back from the fallen drop wire 4A, more particularly as described in Belgian patent application No. 8700254 of the present applicant. Since the device 14 and the mechanism 15 may be of any type and are already sufficiently well known they are not described in further detail.
  • a broken warp thread 18 is shown, as a result of which the corresponding drop wire 4A has fallen, so making an electrical contact, for example with electrode 4B, in a known way.
  • the control unit 20 initiates the cycle described below.
  • the thread 11 can for example be kept in readiness in the thread-joining device 14, ready for the join to be made, thus saving time.
  • the first thread end 17 is gripped by a mechanism 15, such that by appropriate positioning of said mechanism 15, clip 19 and thread-joining device 14, the two threads can be joined together.
  • the first thread end 17 and the thread 11 should preferably be joined to each other while being kept taut.
  • the weaving machine is started up already at this moment, without waiting for the broken thread 18 to be fully repaired.
  • the thread tensioning mechanism 13 which ensures that the tension in the thread 11 is essentially the same as the tension in the other warp threads, weaving can then be started and continued without problem.
  • the second thread end 23 can be located, or a check can be carried out to see whether there is still a thread end 23, after which, depending on the case, the weaving machine may or may not be stopped once more and the second thread end 23 presented and joined to the thread 11, so that the separate thread supply 12 can be freed once more.
  • the last-mentioned step is outwith the scope of the present invention and so is not described in further detail.
  • the thread tensioning mechanism 13 can be of various types. A few examples are described below with reference to figs. 4 to 10.
  • the thread tensioning mechanism 13 consists of a thread clip 24 which exerts a clamping force on the thread 11, where the amount of the force can be set on an adjustment mechanism 25 by means of an adjusting screw 26.
  • a thread compensator 27 in which a thread guide 28 exerts a slight crossways pressure on the thread 11 by means of an elastic device 29.
  • Fig. 5 shows another variant in which the adjustment mechanism 25 consists for example of a compression spring 30 which operates on the thread clip 24, where the spring tension can be adjusted by means of adjusting screw 26.
  • the adjustment mechanism 25 consists for example of a compression spring 30 which operates on the thread clip 24, where the spring tension can be adjusted by means of adjusting screw 26.
  • the separate thread supply 12 consists of a supply package 33, then as shown in figs. 7 and 8 the above-mentioned thread tensioning mechanism 13 can work in conjunction with the package frame 34.
  • a brake disk 35 which turns with the supply package 33
  • a brake shoe 36 which can operate on the brake disk 35, where the braking force exerted by the brake shoe 36 can be set by means of an adjusting mechanism 37.
  • the thread 11 is guided through a thread eye 38 mounted on the end of an elastic arm 39, which in turn is mounted on the hinged brake shoe 36.
  • the operation of this thread tensioning mechanism 13 can be simply deduced from figs. 7 and 8.
  • the tension in the thread 11 can be continuously measured and automatically regulated at a set value by means of a feedback loop.
  • the thread tensioning mechanism 13 consists essentially of a thread draw-off roller 40 which co-operates with said thread 11 taken from the separate thread supply 12, an electric motor 41 to drive the draw-off roller 40, a sensor 42 to measure the tension in the thread 11 after the draw-off roller 40, and a control unit 43 which provides a feedback loop in order to regulate the tension in the thread 11 at a constant predetermined value by regulating the motor 41.
  • This embodiment has the advantage that, if there is not enough tension in the thread 11, after the knot or join 22 has been formed and before the weaving machine is started again the draw-off roller 40 can be turned back until the correct tension is reached.
  • the tension in the thread 11 taken from the separate thread supply 12 is regulated so as to keep it equal or more or less equal to the tension in the other warp threads.
  • the tension in the warp threads 2 is also measured by a second sensor 44.
  • the motor 41, the sensor 42 for measuring the tension in the thread 11 and the above-mentioned sensor 44 are coupled with each other by means of a suitable control unit 45, such that the speed of the draw-off roller 40 is regulated according to the difference in tension measured by the sensors 42 and 44.
  • the weaving machine can be started automatically, in particular by having an automatic device with two conditional functions, namely that the join 22 has been made and that the fallen drop wire 4A no longer makes contact with its electrode 4B.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Claims (14)

  1. Procédé pour continuer le tissage à partir d'une alimentation de fil séparée après une cassure de chaîne, caractérisé en ce qu'il consiste à : rattacher le bout (17) du fil de chaîne cassé (18) qui est toujours attaché à l'étoffe (8), à un fil (11) provenant d'une alimentation de fil séparée (12), formant ainsi un nouveau fil de chaîne; et redémarrer le métier à tisser, tandis que le nouveau fil de chaîne continue à être alimenté à partir de l'alimentation de fil séparée (12), de telle sorte que le nouveau fil (11) reste sous tension.
  2. Procédé selon la revendication 1, caractérisé en ce que le fil (11) reste sous tension de telle sorte que l'ordre de grandeur de la tension correspond principalement à l'ordre de grandeur de la tension régnant dans les autres fils présents dans la chaîne (2).
  3. Procédé selon la revendication 2, caractérisé en ce qu'on règle la tension en exerçant une force constante de freinage sur le fil (11).
  4. Procédé selon la revendication 2, caractérisé en ce qu'on mesure la tension régnant dans le fil (11) provenant de l'alimentation de fil séparée (12) et en ce qu'on règle la tension régnant dans le fil (11) au moyen d'une boucle de rétroaction.
  5. Procédé selon la revendication 4, caractérisé en ce qu'on mesure la tension régnant dans les autres fils présents dans la nappe d'ourdissage (2), de même que la tension régnant dans le fil (11) provenant de l'alimentation de fil séparée (12) et en ce qu'on met au point la tension régnant dans ledit fil (11) conformément à la différence obtenue entre les deux valeurs mesurées et on la règle jusqu'à ce qu'elle soit égale à la tension régnant dans les fils de chaîne présents dans la nappe d'ourdissage (2).
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le métier à tisser redémarre de manière automatique lorsque deux conditions sont remplies, notamment le fait que le joint (22) entre le bout de fil (17) attaché à l'étoffe (8) et le fil (11) provenant de l'alimentation de fil séparée (12) a été réalisé et que la lamelle casse-chaîne (4A) tombée suite à la cassure (16) qui a été réparée, ne se trouve plus en contact avec l'électrode (4B) avec laquelle elle est mise en service.
  7. Métier à tisser qui utilise le procédé selon la revendication 1, caractérisé en ce qu'il est muni d'un dispositif consistant en une alimentation séparée (12), en un mécanisme (13) mettant le fil sous tension, qui peut agir sur le fil (11) provenant de ladite alimentation de fil (12), en un dispositif de rattachage de fil (14), en un mécanisme (15) destiné à localiser et/ou à saisir le premier bout de fil (17) qui s'est formé suite à la cassure (16) de la chaîne et qui est toujours attaché à l'étoffe (8), et en une unité de commande (20) destinée à commander la mise en service des divers composants, d'une manière appropriée.
  8. Métier à tisser selon la revendication 7, caractérisé en ce que le dispositif (13) mettant le fil sous tension consiste en un frein réglable de fil (24).
  9. Métier à tisser selon la revendication 7, caractérisé en ce que le mécanisme (13) mettant le fil sous tension consiste en un cylindre (31), le fil (11) provenant de l'alimentation de fil séparée (12) étant guidé autour de la circonférence dudit cylindre (31), et en un frein réglable (32) destiné à freiner la rotation du cylindre (31).
  10. Métier à tisser selon la revendication 8 ou 9, caractérisé en ce que le dispositif (13) mettant le fil sous tension est également muni d'un compensateur de fil (27).
  11. Métier à tisser selon la revendication 7, caractérisé en ce que l'alimentation de fil séparée (12) consiste en un enroulement d'alimentation (33), tandis que le mécanisme (13) mettant le fil sous tension consiste en un disque de freinage (35) qui agit sur ledit enroulement d'alimentation (33) et qui est muni d'un sabot de frein (36) et d'un mécanisme de réglage (37) destiné à régler la force de freinage.
  12. Métier à tisser selon la revendication 11, caractérisé en ce que le sabot de frein (36) est monté en pivotement et porte, à une de ses extrémités, un bras (39) qui peut fléchir élastiquement et qui, à son tour, porte, à son extrémité, un oeillet (38) à travers lequel on guide le fil (11) provenant de l'alimentation de fil séparée (12).
  13. Métier à tisser selon la revendication 7, caractérisé en ce que le mécanisme (13) mettant le fil sous tension consiste essentiellement en un cylindre délivreur de fil (40) qui agit sur le fil (11) provenant de l'alimentation de fil séparée (12), en un moteur électrique (41) destiné à entraîner le cylindre délivreur (40), en un détecteur (42) destine à mesurer la tension régnant dans ledit fil (11), en particulier entre le cylindre délivreur (40) et le dispositif de casse-chaîne (3), et en une unité de commande (43) qui commande le moteur (41) en fonction de la valeur mesurée audit détecteur (42) de telle sorte que la tension régnant dans le fil (11) alimenté soit réglée à une valeur prédéterminée.
  14. Métier à tisser selon la revendication 7, caractérisé en ce que le dispositif de mise sous tension (13) consiste en un cylindre délivreur de fil (40) qui peut agir sur le fil (11) provenant de l'alimentation de fil séparée (12), en un moteur électrique (41) destiné à entraîner le cylindre délivreur (40), en un détecteur (42) qui mesure la tension régnant dans le fil (11), en particulier, entre le cylindre délivreur (40) et le dispositif de casse-chaîne (3), en un second détecteur (44) qui mesure la tenson régnant dans les autres fils de chaîne présents dans la chaîne (2), et en une unité de commande (45) qui commande le moteur (41) en fonction des valeurs mesurées aux détecteurs (42, 44), si bien que l'on maintient la tension régnant dans le fil (11) provenant de l'alimentation séparée, essentiellement égale à la tension régnant dans les autres fils de chaîne présents dans la chaîne (2).
EP19880202182 1987-10-09 1988-10-03 Procédé pour reprendre le tissage à partir d'une réserve de fil séparé après une cassure de chaîne et machine à tisser pour la mise en oeuvre de ce procédé Expired EP0311206B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8701156A BE1000992A4 (nl) 1987-10-09 1987-10-09 Werkwijze voor het verder weven, na een kettingbreuk, vanaf een afzonderlijke draadvoorraad en weefmachine die deze werkwijze toepast.
BE8701156 1987-10-09

Publications (2)

Publication Number Publication Date
EP0311206A1 EP0311206A1 (fr) 1989-04-12
EP0311206B1 true EP0311206B1 (fr) 1992-08-12

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ID=3882916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880202182 Expired EP0311206B1 (fr) 1987-10-09 1988-10-03 Procédé pour reprendre le tissage à partir d'une réserve de fil séparé après une cassure de chaîne et machine à tisser pour la mise en oeuvre de ce procédé

Country Status (4)

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EP (1) EP0311206B1 (fr)
JP (1) JPH01124661A (fr)
BE (1) BE1000992A4 (fr)
DE (1) DE3873676T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2665918B2 (ja) * 1988-01-26 1997-10-22 津田駒工業株式会社 たて糸自動補修方法およびその装置
GB2216908B (en) * 1988-03-30 1991-10-30 Murata Machinery Ltd Yarn splicing system for warp in a loom

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH276690A (fr) * 1947-06-17 1951-07-31 Koninkl Tricotfabriek G J Will Dispositif d'arrêt d'une machine à travailler une nappe de fils.
DE1535901C3 (de) * 1965-08-26 1978-10-05 Reiners, Walter, Dr.-Ing., 4050 Moenchengladbach Verfahren und Vorrichtung zum Verbinden der an den Fadenspannern und Ablaufspulen eines Spulengatters bereitliegenden Fäden

Also Published As

Publication number Publication date
DE3873676D1 (de) 1992-09-17
DE3873676T2 (de) 1993-01-21
BE1000992A4 (nl) 1989-05-30
EP0311206A1 (fr) 1989-04-12
JPH01124661A (ja) 1989-05-17

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