EP0759484A1 - Weft insertion device for a gripper loom - Google Patents

Weft insertion device for a gripper loom Download PDF

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Publication number
EP0759484A1
EP0759484A1 EP96420264A EP96420264A EP0759484A1 EP 0759484 A1 EP0759484 A1 EP 0759484A1 EP 96420264 A EP96420264 A EP 96420264A EP 96420264 A EP96420264 A EP 96420264A EP 0759484 A1 EP0759484 A1 EP 0759484A1
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EP
European Patent Office
Prior art keywords
strip
leaf
longitudinal axis
crowd
permanent magnets
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Granted
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EP96420264A
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German (de)
French (fr)
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EP0759484B1 (en
Inventor
Christophe Saint Sulpice
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ICBT Diederichs SAS
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ICBT Diederichs SAS
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Publication of EP0759484A1 publication Critical patent/EP0759484A1/en
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    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/271—Rapiers
    • D03D47/272—Rapier bands

Definitions

  • the invention relates to the field of weaving looms, more particularly weaving looms whose insertion of the weft thread is ensured by lances. It more specifically aims at an improvement in the device for guiding said lances through the crowd.
  • the leaf receives, in known manner, two lances which pass symmetrically through the crowd, from one edge of the fabric, to the center, in an alternating movement.
  • Each lance has at its free end a clamp capable of grasping the wire.
  • the so-called “input” clamp grabs the thread on an edge of the fabric to bring it to the center of the crowd, where it exchanges it with the so-called “exit” clamp which leads the weft thread to opposite edge of the fabric.
  • the document FR 2 244 852 corresponding to document US 3 957 089 has proposed the use of a magnetically operating guide device.
  • the envisaged solution consists in installing in the leaf, an electromagnet comprising side plates allowing the magnetic field to close by passing through the path of the clamp. Thus when the electromagnet is energized, the magnetic field keeps the clamp between the two aforementioned sheets.
  • This solution overcomes the presence of hooks, but requires an electromagnet whose mass is large, and which must also ensure the supply. It is therefore understandable that this solution is not easily integrated into a conventional leaf of a loom.
  • the wide shape of the metal elements embedded in the ribbon does not allow lateral guidance of great precision, when we know that this is a critical point, particularly with regard to the exchange of the weft thread from one clamp to another.
  • the problem which the invention proposes to solve is to provide a system for guiding the lance with respect to the leaf, which is light and easily integrated inside a loom, while ensuring precise centering of the throws in relation to the wing.
  • the invention relates to a device for the insertion of the weft thread, usable on rapier weaving looms, each of the spears consisting of a clamp and a ribbon, in which the ribbons move by reciprocating movement from on both sides of the fabric, penetrating substantially the same distance into the crowd so that the clamps transmit said weft, said lances traversing the crowd by sliding on a fault integral with the leaf and flush with the wires of the lower layer of the crowd, and in which the guidance of said lances relative to the leaf is magnetically secured by an element made of ferromagnetic material and a plurality of permanent magnets arranged on the strip and on the leaf.
  • the guidance of the clamp is ensured by the interaction between magnets placed on the strip and a metallic element located under the purlin.
  • the magnet and the elongated part attract each other, so that the gripper remains on the path corresponding to the minimum distance between the magnet and said elongated element.
  • each magnet is grouped on the longitudinal axis of the ribbon, while the area of the elongate element liable to be the most attracted by the magnet, is also located opposite the longitudinal axis of the ribbon.
  • the magnet-elongate element assembly naturally tends to come into contact with the longitudinal axis of the ribbon with the thickest zone of the elongate element, which allows optimal and self-correcting centering.
  • the shape of the characteristic elements means that the equilibrium position is automatically centered.
  • the permanent magnets follow a disc shape while the ferromagnetic element takes the shape of a cylinder.
  • the ribbon has recessed areas into which the magnetized discs are inserted.
  • the leaf has a longitudinal groove, the opening of which is directed under the purlin and in which the ferromagnetic element is housed.
  • Figure 1 is a perspective view of the insertion area of the frame, showing a lance entering the crowd.
  • Figure 2 is a section of Figure 1 along a vertical plane parallel to a warp thread showing the characteristic details of a lance according to the invention.
  • the invention relates to an improvement of the lance guide system in the pincer looms.
  • the traditional weaving loom on which the invention is installed comprises a leaf (1), a comb (2) and a track (3) flush with the part (4) of the crowd (5) in contact with the leaf (1) when said crowd (5) is open.
  • the insertion of the weft thread is conventionally obtained by the reciprocating movement of a lance (6) whose free end supports a clamp (7) capable of bringing the weft thread from one edge of the fabric to the center of the crowd.
  • a lance (6) whose free end supports a clamp (7) capable of bringing the weft thread from one edge of the fabric to the center of the crowd.
  • the invention can be applied equally to lances equipped with so-called “positive” clamps and in which the exchange of the weft thread between the clamps is effected by actuation of an external member on the clamp, as to the so-called “negative” clamps in which the exchange of the weft thread is effected by pulling out. In this way, we will not describe here in detail the precise structure of a clamp.
  • the ribbon (8) on which the clamp is fixed comprises several discs (9) arranged along the longitudinal axis of the ribbon (8), in particular at its end which penetrates into the crowd , and which supports the clamp (7).
  • the magnets (9) are housed in indentations in the ribbon, in order to reduce as much as possible the distance between the leaf (1) and the magnets (9).
  • Each of these magnets (9) has a magnetization directed perpendicular to the flat faces of the ribbon (8).
  • the magnets used are made of rare earths and have a diameter of thirteen millimeters and a thickness of four millimeters.
  • the leaf (1) has an extension (10) made of a profile which is arranged just below the lower ply (4) of the crowd.
  • this profile (10) has on its upper face, a track (3) made of polypropylene bristles, commonly called purlin.
  • purlin (3) receives the lower sheet (4) of the crowd which penetrates slightly inside the bristles.
  • this profile is made of a non-magnetizable material, for example aluminum.
  • This fault (3) also serves as a sliding track for the ribbon (8) of the lance (6).
  • the profile (10) has, just below the purlin (3), a longitudinal housing (11) into which is inserted a cylindrical bar (12) made of ferromagnetic material, for example of soft iron or steel .
  • the groove (11) is arranged in the center of the upper face of the profile (10).
  • the ferromagnetic bar (12) has a maximum thickness along the median longitudinal plane (14) of the purlin.
  • this cylinder typically is four millimeters.
  • the forces exerted by the magnet (9) on the ferromagnetic element (12) are symmetrically distributed on either side of the longitudinal axis of the strip (8).
  • the position illustrated in FIG. 2 constitutes a stable equilibrium position in which the ribbon (8) returns in the event of deviation. Indeed, if the ribbon (8) shifts slightly on one side of the purlin (3), as the maximum magnetization of the magnet is directed along the longitudinal axis (13) of the ribbon (8), the latter is subjected to restoring forces which tend to align said magnetization with the thickness maximum of the ferromagnetic bar (12). This gives a particularly advantageous self-centering phenomenon for guiding.
  • the guide device has the following notable advantages: on the one hand, it makes it possible to guide the lance over the tip without the use of hooks entering the crowd. On the other hand, the geometry of the magnetic elements ensures self-centering of the ribbon on the leaf.

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

Abstract

The loom with a lance weft insertion mechanism has permanent magnets (9) positioned along the lance strip (8) line, to give a magnetic guide action. A ferro-magnetic unit (12), at the frame support (1), is on a continuous line under the sliding surface (3), to support the moving lances, along the lance longitudinal axis. Each magnet (9) has a symmetrical section parallel to the magnetic direction and the longitudinal axis of the lance strip (8), and with a max. length on the symmetrical section (13). The ferro-magnetic unit (12) also has a similar symmetrical section (14), with the max. thickness on its symmetrical section.

Description

Domaine techniqueTechnical area

L'invention concerne le domaine des métiers à tisser, plus particulièrement des métiers à tisser dont l'insertion du fil de trame est assuré par des lances. Elle vise plus précisément un perfectionnement dans le dispositif de guidage desdites lances à travers la foule.The invention relates to the field of weaving looms, more particularly weaving looms whose insertion of the weft thread is ensured by lances. It more specifically aims at an improvement in the device for guiding said lances through the crowd.

Techniques antérieuresPrevious techniques

Dans les métiers à tisser dits "à pinces", le battant reçoit, de manière connue, deux lances qui parcourent symétriquement la foule, d'un bord du tissu, jusqu'au centre, selon un mouvement alternatif.In the so-called "pliers" looms, the leaf receives, in known manner, two lances which pass symmetrically through the crowd, from one edge of the fabric, to the center, in an alternating movement.

Chaque lance comporte à son extrémité libre, une pince apte à saisir le fil. La pince dite "d'entrée" saisit le fil sur un bord du tissu pour l'amener jusqu'au centre de la foule, où elle l'échange avec la pince dite "de sortie" qui conduit le fil de trame jusqu'au bord opposé du tissu.Each lance has at its free end a clamp capable of grasping the wire. The so-called "input" clamp grabs the thread on an edge of the fabric to bring it to the center of the crowd, where it exchanges it with the so-called "exit" clamp which leads the weft thread to opposite edge of the fabric.

Il existe déjà des métiers à tisser dans lesquels les lances sont rigides et dont le guidage est assuré par un fourreau placé en débordement latéral du battant. Ce dispositif d'insertion fonctionne sans aucun système de guidage au niveau de la foule, mais présente l'inconvénient majeur, outre la largeur importante de la machine, le fait que chaque lance possède une énergie cinétique très élevée, ce qui nécessite, pour provoquer le mouvement alternatif, des organes de freinage et d'accélération conséquents.There are already weaving looms in which the lances are rigid and whose guidance is provided by a sheath placed in lateral overflow of the leaf. This insertion device works without any guidance system at crowd level, but has the major drawback, in addition to the large width of the machine, the fact that each lance has a very high kinetic energy, which requires, to cause reciprocating, consequent braking and acceleration devices.

Pour s'affranchir du problème d'encombrement, on a proposé d'utiliser des lances composées d'une pince et d'un ruban souple à crémaillère entraîné par la machine. Lors du mouvement de la lance, le ruban est courbé de telle façon qu'il n'augmente pas l'encombrement de la machine. L'utilisation de ce type de ruban souple pose le problème du guidage de la pince à l'intérieur de la foule.To overcome the problem of space, it has been proposed to use lances composed of pliers and a flexible ribbon with rack driven by the machine. During the movement of the lance, the ribbon is curved so that it does not increase the size of the machine. The use of this type of flexible tape poses the problem of guiding the clamp inside the crowd.

Pour résoudre ce problème, on dispose de manière connue, sous la nappe inférieure formant la foule, d'une piste de poils de polypropylène collés sur une bande adhésive et sur laquelle s'appuie la lance. Cette piste, ou panne, supporte le mouvement du ruban qui est guidé par une pluralité de crochets répartis le long du trajet de la pince. Ces crochets traversent la nappe inférieure de la foule et sont orientés vers l'intérieur de la panne. Il va de soi que le passage de ces crochets à travers la foule peut provoquer des risques de cassure des fils de chaîne, ce qui diminue notoirement les capacités de la machine.To solve this problem, there is a known manner, under the lower ply forming the crowd, a track of polypropylene bristles glued on an adhesive strip and on which the lance rests. This track, or breakdown, supports the movement of the tape which is guided by a plurality of hooks distributed along the path of the clamp. These hooks cross the lower tablecloth of the crowd and are oriented towards the inside of the purlin. It goes without saying that the passage of these hooks through the crowd can cause risks of breakage of the warp threads, which notoriously reduces the capacities of the machine.

Un autre inconvénient inhérent à l'utilisation de crochets de guidage du ruban, résulte de la structure mécanique dudit ruban. En effet, la rigidité mécanique du ruban est donnée par des âmes en fibre de carbone bien connues pour leur solidité. Lors du passage du ruban à l'intérieur des crochets, le frottement provoque le dépôt d'une certaine quantité de carbone sur les faces intérieures des crochets. Il s'ensuit que d'une part les rubans s'usent et que d'autre part, le passage des fils de chaîne autour des crochets provoque l'entraînement de ces dépôts noirs ce qui génère des zones sales dans le tissu.Another drawback inherent in the use of tape guide hooks results from the mechanical structure of said tape. Indeed, the mechanical rigidity of the ribbon is given by carbon fiber cores well known for their solidity. During the passage of the tape inside the hooks, the friction causes the deposition of a certain amount of carbon on the interior faces of the hooks. It follows that, on the one hand, the ribbons wear out and, on the other hand, the passage of the warp threads around the hooks causes these black deposits to be entrained, which generates dirty areas in the fabric.

Un des problèmes que se pose donc de résoudre l'invention est la suppression de l'utilisation des crochets de guidage du ruban.One of the problems that therefore arises to solve the invention is the elimination of the use of tape guide hooks.

On a proposé dans le document FR 2 244 852 correpondant au document US 3 957 089, l'utilisation d'un dispositif de guidage fonctionnant magnétiquement. La solution envisagée consiste à installer dans le battant, un électro-aimant comportant des tôles latérales permettant au champ magnétique de se refermer en passant par la trajectoire de la pince. Ainsi lorsque l'électro-aimant est alimenté, le champ magnétique maintient la pince entre les deux tôles précitées. Cette solution permet de s'affranchir de la présence des crochets, mais nécessite un électro-aimant dont la masse est importante, et dont il faut en outre assurer l'alimentation. On conçoit donc que cette solution n'est pas aisément intégrable dans un battant classique de métier à tisser.The document FR 2 244 852 corresponding to document US 3 957 089 has proposed the use of a magnetically operating guide device. The envisaged solution consists in installing in the leaf, an electromagnet comprising side plates allowing the magnetic field to close by passing through the path of the clamp. Thus when the electromagnet is energized, the magnetic field keeps the clamp between the two aforementioned sheets. This solution overcomes the presence of hooks, but requires an electromagnet whose mass is large, and which must also ensure the supply. It is therefore understandable that this solution is not easily integrated into a conventional leaf of a loom.

Par ailleurs, cette solution ne présente pas de moyen permettant un centrage de la pince par rapport au moyen de guidage, ce qui peut s'avérer fâcheux lors de l'utilisation de pinces excentrées par rapport au ruban, ce qui est le cas notamment avec les pinces communément appelées "pinces positives".Furthermore, this solution does not have any means allowing the clamp to be centered relative to the guide means, which can prove to be unfortunate when using clamps offset relative to the ribbon, which is the case in particular with the clamps commonly called "positive clamps".

On a également proposé dans le document US 4 126 159 d'utiliser des moyens magnétiques pour provoquer une attraction du battant sur le ruban. Plus précisément, ce document décrit une solution dans laquelle les extrémités latérales du battant comportent des électro-aimants destinés à attirer la pince disposée à l'extrémité du ruban, pour éviter que cette dernière ne se décolle de la panne lorsque la pince atteint les bords du battant. Cette solution ne permet pas de s'affranchir de l'utilisation de crochets de guidage et présente donc les inconvénients exposés ci-avant.It has also been proposed in document US Pat. No. 4,126,159 to use magnetic means to cause attraction of the leaf on the ribbon. More specifically, this document describes a solution in which the lateral ends of the leaf comprise electromagnets intended to attract the clamp arranged at the end of the strip, to prevent the latter from coming off the breakdown when the clamp reaches the edges. of the clapper. This solution does not overcome the use of guide hooks and therefore has the drawbacks described above.

Par ailleurs, on a proposé dans le document EP 0 233 141, d'équiper le battant avec deux aimants disposés au niveau de la zone de rencontre des pinces, tandis que le ruban comporte un ensemble d'éléments métalliques aussi légers que possible noyés dans son épaisseur au niveau de la zone de liaison avec la pince. Ainsi, à la fin de son parcours sur la panne, le ruban subit, lorsque les éléments métalliques sont en regard des éléments situés sur le battant, une attraction qui assure une certaine stabilisation. Malheureusement, la distribution discrète et localisée des éléments métalliques et des aimants, se traduit par une fluctuation de l'intensité de la force d'attraction au cours du trajet de la pince, ce qui constitue des facteurs d'instabilité.Furthermore, it has been proposed in document EP 0 233 141, to equip the leaf with two magnets placed at the level of the clamp meeting area, while the ribbon comprises a set of metal elements as light as possible embedded in its thickness at the level of the connection zone with the clamp. Thus, at the end of its course on the purlin, the strip undergoes, when the metallic elements are opposite the elements located on the leaf, an attraction which ensures a certain stabilization. Unfortunately, the discrete and localized distribution of the metallic elements and the magnets, results in a fluctuation in the intensity of the force of attraction during the path of the clamp, which constitutes factors of instability.

En outre, la forme large des éléments métalliques noyés dans le ruban ne permettent pas un guidage latéral d'une grande précision, alors que l'on sait qu'il s'agit d'un point critique, notamment en ce qui concerne l'échange du fil de trame d'une pince à l'autre.In addition, the wide shape of the metal elements embedded in the ribbon does not allow lateral guidance of great precision, when we know that this is a critical point, particularly with regard to the exchange of the weft thread from one clamp to another.

Le problème que se propose de résoudre l'invention est de fournir un système de guidage de la lance par rapport au battant, qui soit léger et facilement intégrable à l'intérieur d'un métier à tisser, tout en assurant un centrage précis de la lance par rapport au battant.The problem which the invention proposes to solve is to provide a system for guiding the lance with respect to the leaf, which is light and easily integrated inside a loom, while ensuring precise centering of the throws in relation to the wing.

Exposé de l'inventionStatement of the invention

L'invention concerne un dispositif pour l'insertion du fil de trame, utilisable sur les métiers à tisser à lances, chacune des lances se composant d'une pince et d'un ruban, dans lequel les rubans se déplacent par mouvement alternatif à partir des deux cotés du tissu en pénétrant sensiblement de la même distance dans la foule pour que les pinces se transmettent ladite trame, lesdites lances parcourant la foule par glissement sur une panne solidaire du battant et affleurant sous les fils de la nappe inférieure de la foule, et dans lequel le guidage desdites lances par rapport au battant est assuré magnétiquement par un élément en matériau ferromagnétique et une pluralité d'aimants permanents disposés sur le ruban et sur le battant.The invention relates to a device for the insertion of the weft thread, usable on rapier weaving looms, each of the spears consisting of a clamp and a ribbon, in which the ribbons move by reciprocating movement from on both sides of the fabric, penetrating substantially the same distance into the crowd so that the clamps transmit said weft, said lances traversing the crowd by sliding on a fault integral with the leaf and flush with the wires of the lower layer of the crowd, and in which the guidance of said lances relative to the leaf is magnetically secured by an element made of ferromagnetic material and a plurality of permanent magnets arranged on the strip and on the leaf.

Le perfectionnement que constitue l'invention se caractérise en ce que:

  • d'une part, les aimants permanents sont localisés sur le ruban selon l'axe longitudnal de celui-ci, l'élément en matériau ferromagnétique étant continu, longiligne et disposé sous la panne en regard de l'axe longitudinal du ruban,
  • d'autre part, chaque aimant comporte un plan de symétrie parallèle à la direction d'aimantation et à l'axe longitudinal du ruban, et présente une longueur maximale située dans son plan de symétrie,
  • et enfin, l'élément ferromagnétique comporte un plan de symétrie parallèle à la direction d'aimantation et à l'axe longitudinal du ruban, et présente une épaisseur maximale située dans son plan de symétrie.
The improvement which constitutes the invention is characterized in that:
  • on the one hand, the permanent magnets are located on the strip along the longitudinal axis of the latter, the element made of ferromagnetic material being continuous, slender and arranged under the purlins facing the longitudinal axis of the strip,
  • on the other hand, each magnet has a plane of symmetry parallel to the direction of magnetization and to the longitudinal axis of the strip, and has a maximum length situated in its plane of symmetry,
  • and finally, the ferromagnetic element comprises a plane of symmetry parallel to the direction of magnetization and to the longitudinal axis of the strip, and has a maximum thickness situated in its plane of symmetry.

Autrement dit, le guidage de la pince est assuré par l'interaction entre des aimants placés sur le ruban et un élément métallique situé sous la panne. Au fur et à mesure de l'avancée de la pince, l'aimant et la pièce longiligne s'attirent, de sorte que la pince reste sur la trajectoire correspondant à la distance minimale entre l'aimant et ledit élément longiligne.In other words, the guidance of the clamp is ensured by the interaction between magnets placed on the strip and a metallic element located under the purlin. As the gripper advances, the magnet and the elongated part attract each other, so that the gripper remains on the path corresponding to the minimum distance between the magnet and said elongated element.

L'aimantation de chaque aimant est regroupée sur l'axe longitudinal du ruban, tandis que la zone de l'élément longiligne susceptible de subir la plus forte attraction par l'aimant, est également situé au regard de l'axe longitudinal du ruban. De cette manière, l'ensemble aimant-élément longiligne a tendance naturellement à venir mettre en regard l'axe longitudinal du ruban avec la zone la plus épaisse de l'élément longiligne, ce qui permet un centrage optimal et auto-correcteur. En d'autres termes, la forme des éléments caractéristiques fait que la position d'équilibre est automatiquement centrée.The magnetization of each magnet is grouped on the longitudinal axis of the ribbon, while the area of the elongate element liable to be the most attracted by the magnet, is also located opposite the longitudinal axis of the ribbon. In this way, the magnet-elongate element assembly naturally tends to come into contact with the longitudinal axis of the ribbon with the thickest zone of the elongate element, which allows optimal and self-correcting centering. In in other words, the shape of the characteristic elements means that the equilibrium position is automatically centered.

Avantageusement en pratique, les aimants permanents épousent une forme de disque tandis que l'élément ferromagnétique épouse une forme de cylindre.Advantageously in practice, the permanent magnets follow a disc shape while the ferromagnetic element takes the shape of a cylinder.

Ainsi, le ruban présente des zones en creux dans lesquelles viennent s'insérer les disques aimantés. Parallèlement, le battant comporte une gorge longitudinale dont l'ouverture est dirigée sous la panne et dans laquelle est logé l'élément ferromagnétique.Thus, the ribbon has recessed areas into which the magnetized discs are inserted. In parallel, the leaf has a longitudinal groove, the opening of which is directed under the purlin and in which the ferromagnetic element is housed.

Avantageusement en pratique :

  • le diamètre de chaque disque en aimant permanent est compris entre cinq et vingt millimètres ;
  • l'épaisseur de chaque disque est comprise entre un et dix millimètres, préférentiellement entre trois et cinq millimètres ;
  • le diamètre du cylindre de matériau ferromagnétique est compris entre trois et dix millimètres ;
  • les aimants permanents sont en terres rares et l'élément ferromagnétique est en acier.
Advantageously in practice:
  • the diameter of each permanent magnet disc is between five and twenty millimeters;
  • the thickness of each disc is between one and ten millimeters, preferably between three and five millimeters;
  • the diameter of the ferromagnetic material cylinder is between three and ten millimeters;
  • the permanent magnets are made of rare earths and the ferromagnetic element is made of steel.

Description sommaire des dessinsBrief description of the drawings

La manière de réaliser l'invention ainsi que les avantages qui en découlent ressortiront bien de la description d'une forme d'exécution particulière illustrée à l'appui des figures annexées.The manner of carrying out the invention as well as the advantages which result therefrom will emerge clearly from the description of a particular embodiment illustrated with the support of the appended figures.

La figure 1 est une vue en perspective de la zone d'insertion de la trame, montrant une lance pénétrant dans la foule.
La figure 2 est une coupe de la figure 1 selon un plan vertical parallèle à un fil de chaîne montrant les détails caractéristiques d'une lance conforme à l'invention.Figure 1 is a perspective view of the insertion area of the frame, showing a lance entering the crowd.
Figure 2 is a section of Figure 1 along a vertical plane parallel to a warp thread showing the characteristic details of a lance according to the invention.

Manière de réaliser l'inventionWay of realizing the invention

Comme déjà dit, l'invention concerne un perfectionnement du système de guidage des lances dans les métiers à tisser à pince. Ainsi, comme on le voit à la figure 1, le métier à tisser traditionnel sur lequel est installé l'invention comprend un battant (1), un peigne (2) et une piste (3) affleurant sous la partie (4) de la foule (5) au contact du battant (1) lorsque ladite foule (5) est ouverte.As already said, the invention relates to an improvement of the lance guide system in the pincer looms. Thus, as can be seen in FIG. 1, the traditional weaving loom on which the invention is installed comprises a leaf (1), a comb (2) and a track (3) flush with the part (4) of the crowd (5) in contact with the leaf (1) when said crowd (5) is open.

L'insertion du fil de trame est obtenue classiquement par le mouvement alternatif d'une lance (6) dont l'extrémité libre supporte une pince (7) apte à emmener le fil de trame d'un bord du tissu jusqu'au centre de la foule. Il va de soi que l'invention peut s'appliquer indifféremment aux lances équipées de pinces dites "positives" et dans lesquelles l'échange du fil de trame entre les pinces s'effectue par actionnement d'un organe extérieur sur la pince, comme aux pinces dites "négatives" dans lesquelles l'échange du fil de trame s'effectue par arrachement. De la sorte, on ne décrira pas ici en détail la structure précise d'une pince.The insertion of the weft thread is conventionally obtained by the reciprocating movement of a lance (6) whose free end supports a clamp (7) capable of bringing the weft thread from one edge of the fabric to the center of the crowd. It goes without saying that the invention can be applied equally to lances equipped with so-called "positive" clamps and in which the exchange of the weft thread between the clamps is effected by actuation of an external member on the clamp, as to the so-called "negative" clamps in which the exchange of the weft thread is effected by pulling out. In this way, we will not describe here in detail the precise structure of a clamp.

Comme on le voit sur la figure 1, le ruban (8) sur lequel est fixé la pince, comporte plusieurs disques (9) disposés selon l'axe longitudinal du ruban (8), notamment au niveau de son extrémité qui pénètre dans la foule, et qui supporte la pince (7). Les aimants (9) sont logés dans des empreintes en creux du ruban, afin de diminuer autant que possible la distance entre le battant (1) et les aimants (9). Chacun des ces aimants (9) présente une aimantation dirigée perpendiculairement aux faces planes du ruban (8).As can be seen in FIG. 1, the ribbon (8) on which the clamp is fixed, comprises several discs (9) arranged along the longitudinal axis of the ribbon (8), in particular at its end which penetrates into the crowd , and which supports the clamp (7). The magnets (9) are housed in indentations in the ribbon, in order to reduce as much as possible the distance between the leaf (1) and the magnets (9). Each of these magnets (9) has a magnetization directed perpendicular to the flat faces of the ribbon (8).

Typiquement et de manière illustrative non limitative, les aimants utilisés sont en terres rares et présentent un diamètre de treize millimètres et une épaisseur de quatre millimètres.Typically and in a nonlimiting illustration, the magnets used are made of rare earths and have a diameter of thirteen millimeters and a thickness of four millimeters.

Par ailleurs, le battant (1) comporte un prolongement (10) réalisé en profilé qui est disposé juste en dessous de la nappe inférieure (4) de la foule. De manière connue, ce profilé (10) comporte sur sa face supérieure, une piste (3) réalisée en poils de polypropylène, communément appelée panne. Lorsque la foule (5) est ouverte, cette panne (3) reçoit la nappe inférieure (4) de la foule qui pénètre légèrement à l'intérieur des poils.Furthermore, the leaf (1) has an extension (10) made of a profile which is arranged just below the lower ply (4) of the crowd. In known manner, this profile (10) has on its upper face, a track (3) made of polypropylene bristles, commonly called purlin. When the crowd (5) is open, this purlin (3) receives the lower sheet (4) of the crowd which penetrates slightly inside the bristles.

Pour assurer un bon fonctionnement du système de guidage, il est bien entendu nécessaire que ce profilé soit en un matériau non aimantable, par exemple en aluminium.To ensure proper operation of the guide system, it is of course necessary that this profile is made of a non-magnetizable material, for example aluminum.

Cette panne (3) sert également de piste de glissement pour le ruban (8) de la lance (6).This fault (3) also serves as a sliding track for the ribbon (8) of the lance (6).

Conformément à l'invention le profilé (10) présente, juste en dessous de la panne (3), un logement longitudinal (11) dans lequel est inséré un barreau cylindrique (12) en matériau ferromagnétique, par exemple en fer doux ou en acier. La gorge (11) est disposée au centre de la face supérieure du profilé (10).According to the invention the profile (10) has, just below the purlin (3), a longitudinal housing (11) into which is inserted a cylindrical bar (12) made of ferromagnetic material, for example of soft iron or steel . The groove (11) is arranged in the center of the upper face of the profile (10).

Conformément à une autre caractéristique de l'invention, le barreau ferromagnétique (12) présente une épaisseur maximale selon le plan longitudinal médian (14) de la panne.According to another characteristic of the invention, the ferromagnetic bar (12) has a maximum thickness along the median longitudinal plane (14) of the purlin.

Typiquement, le diamètre de ce cylindre est de quatre millimètres.Typically, the diameter of this cylinder is four millimeters.

Ainsi, les forces exercées par l'aimant (9) sur l'élément ferromagnétique (12) sont symétriquement réparties de part et d'autre de l'axe longitudinal du ruban (8). La position illustrée en figure 2 constitue une position d'équilibre stable dans laquelle revient le ruban (8) en cas de déviation. En effet, si le ruban (8) se décale légèrement sur un côté de la panne (3), comme l'aimantation maximale de l'aimant est dirigée selon l'axe longitudinal (13) du ruban (8), celui-ci est soumis à des forces de rappel qui tendent à aligner ladite aimantation avec l'épaisseur maximale du barreau ferromagnétique (12). On obtient ainsi un phénomène d'autocentrage particulièrement avantageux pour le guidage.Thus, the forces exerted by the magnet (9) on the ferromagnetic element (12) are symmetrically distributed on either side of the longitudinal axis of the strip (8). The position illustrated in FIG. 2 constitutes a stable equilibrium position in which the ribbon (8) returns in the event of deviation. Indeed, if the ribbon (8) shifts slightly on one side of the purlin (3), as the maximum magnetization of the magnet is directed along the longitudinal axis (13) of the ribbon (8), the latter is subjected to restoring forces which tend to align said magnetization with the thickness maximum of the ferromagnetic bar (12). This gives a particularly advantageous self-centering phenomenon for guiding.

Il ressort de ce qui précède que le dispositif de guidage conforme à l'invention présente les avantages notables suivants : d'une part, il permet d'assurer le guidage de la lance sur la panne sans utilisation de crochets pénétrant dans la foule. D'autre part, la géométrie des éléments magnétiques assure un autocentrage du ruban sur le battant.It emerges from the above that the guide device according to the invention has the following notable advantages: on the one hand, it makes it possible to guide the lance over the tip without the use of hooks entering the crowd. On the other hand, the geometry of the magnetic elements ensures self-centering of the ribbon on the leaf.

Claims (8)

Dispositif pour l'insertion du fil de trame, utilisable sur les métiers à tisser à lances, chacune des lances (6) se composant d'une pince (7) et d'un ruban (8), dans lequel les rubans (8) se déplacent par mouvement alternatif à partir des deux cotés du tissu en pénétrant sensiblement de la même distance dans la foule (5) pour que les pinces (7) se transmettent ladite trame, lesdites lances (6) parcourant la foule (5) par glissement sur une panne (3) solidaire du battant (1) et affleurant sous les fils (4) de la nappe inférieure (4) de la foule, et dans lequel le guidage desdites lances (6) par rapport au battant (1) est assuré magnétiquement par un élément (12) en matériau ferromagnétique et une pluralité d'aimants (9) permanents disposés sur le ruban (8) et sur le battant (1), caractérisé : - en ce que les aimants permanents (9) sont localisés sur le ruban (8) selon l'axe longitudinal de celui-ci, l'élément en matériau ferromagnétique étant continu, longiligne et disposé sous la panne (3) en regard de l'axe longitudinal du ruban, - en ce que chaque aimant comporte un plan de symétrie (13) parallèle à la direction d'aimantation et à l'axe longitudinal du ruban (7), et présente une longueur maximale située dans son plan de symétrie (13), - et en ce que l'élément ferromagnétique comporte un plan de symétrie (14) parallèle à la direction d'aimantation et à l'axe longitudinal du ruban (7), et présente une épaisseur maximale située dans son plan de symétrie (13). Device for inserting the weft thread, usable on rapier looms, each of the rapiers (6) consisting of pliers (7) and a ribbon (8), in which the ribbons (8) move by reciprocating movement from both sides of the fabric, penetrating substantially the same distance into the crowd (5) so that the clamps (7) transmit said weft, said lances (6) traversing the crowd (5) by sliding on a purlin (3) integral with the leaf (1) and flush with the wires (4) of the lower ply (4) of the crowd, and in which the guidance of said lances (6) relative to the leaf (1) is ensured magnetically by an element (12) made of ferromagnetic material and a plurality of permanent magnets (9) arranged on the strip (8) and on the leaf (1), characterized : - in that the permanent magnets (9) are located on the strip (8) along the longitudinal axis thereof, the element made of ferromagnetic material being continuous, slender and disposed under the purlin (3) opposite the 'longitudinal axis of the ribbon, - in that each magnet has a plane of symmetry (13) parallel to the direction of magnetization and to the longitudinal axis of the strip (7), and has a maximum length situated in its plane of symmetry (13), - And in that the ferromagnetic element comprises a plane of symmetry (14) parallel to the direction of magnetization and to the longitudinal axis of the strip (7), and has a maximum thickness situated in its plane of symmetry (13) . Dispositif selon la revendication 1, caractérisé en ce que les aimants (9) permanents épousent une forme de disque.Device according to claim 1, characterized in that the permanent magnets (9) follow a disc shape. Dispositif selon la revendication 1, caractérisé en ce que l'élément ferromagnétique (12) épouse une forme de cylindre.Device according to claim 1, characterized in that the ferromagnetic element (12) follows a cylinder shape. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que le battant (1) comporte une gorge longitudinale (11) dont l'ouverture est dirigée sous la panne (3) et dans laquelle est logé l'élément ferromagnétique (12).Device according to one of claims 1 to 3, characterized in that the leaf (1) has a longitudinal groove (11), the opening of which is directed under the purlin (3) and in which the ferromagnetic element (12) is housed ). Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que le ruban (8) présente des zones en creux dans lesquels sont logés les aimants permanents (9).Device according to one of Claims 1 to 4, characterized in that the strip (8) has recessed areas in which the permanent magnets (9) are housed. Dispositif selon la revendication 2, caractérisé en ce que le diamètre de chaque disque (9) en aimant permanent est compris entre cinq et vingt millimètres et en ce que l'épaisseur de chaque disque est comprise entre un et dix millimètres.Device according to claim 2, characterized in that the diameter of each disc (9) in permanent magnet is between five and twenty millimeters and in that the thickness of each disc is between one and ten millimeters. Dispositif selon la revendications 3, caractérisé en ce que le diamètre du cylindre (12) de matériau ferromagnétique est compris entre trois et dix millimètres.Device according to claim 3, characterized in that the diameter of the cylinder (12) of ferromagnetic material is between three and ten millimeters. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que les aimants permanents (9) sont en terres rares et l'élément (12) ferromagnétique est en acier.Device according to one of claims 1 to 7, characterized in that the permanent magnets (9) are made of rare earths and the ferromagnetic element (12) is made of steel.
EP96420264A 1995-08-18 1996-08-02 Weft insertion device for a gripper loom Expired - Lifetime EP0759484B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510029A FR2737897B1 (en) 1995-08-18 1995-08-18 DEVICE FOR INSERTING THE WEFT YARN ON A NOZZLE WEAVING MATERIAL
FR9510029 1995-08-18

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EP0759484A1 true EP0759484A1 (en) 1997-02-26
EP0759484B1 EP0759484B1 (en) 1999-08-04

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EP96420264A Expired - Lifetime EP0759484B1 (en) 1995-08-18 1996-08-02 Weft insertion device for a gripper loom

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EP (1) EP0759484B1 (en)
JP (1) JPH09111592A (en)
AT (1) ATE182930T1 (en)
DE (1) DE69603553T2 (en)
ES (1) ES2134575T3 (en)
FR (1) FR2737897B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1394302A1 (en) * 2002-08-30 2004-03-03 Promatech S.p.A. Improvements in weft carrying grippers for weaving looms and in guiding means thereof
EP1479808A2 (en) * 2003-05-20 2004-11-24 NV Michel van de Wiele Method and device for taking over a weft yarn by a gripper rapier from a donor rapier
WO2007039244A2 (en) * 2005-10-01 2007-04-12 Sultex Ag Method for supporting a weft thread guiding element
EP2829646A1 (en) * 2013-07-24 2015-01-28 SCHÖNHERR Textilmaschinenbau GmbH Weft insertion system, reed, rapier and weaving machine comprising such elements

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2244852A1 (en) * 1973-09-24 1975-04-18 Martinelli Giovanna
US4126159A (en) * 1977-09-29 1978-11-21 Vercaemert Gerard A Apparatus and method for stabilizing rapiers
EP0233141A1 (en) * 1986-02-10 1987-08-19 GebràœDer Sulzer Aktiengesellschaft Needle loom

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2244852A1 (en) * 1973-09-24 1975-04-18 Martinelli Giovanna
US4126159A (en) * 1977-09-29 1978-11-21 Vercaemert Gerard A Apparatus and method for stabilizing rapiers
EP0233141A1 (en) * 1986-02-10 1987-08-19 GebràœDer Sulzer Aktiengesellschaft Needle loom

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1394302A1 (en) * 2002-08-30 2004-03-03 Promatech S.p.A. Improvements in weft carrying grippers for weaving looms and in guiding means thereof
US6973942B2 (en) 2002-08-30 2005-12-13 Promatech S.P.A. Weft carrying grippers for weaving looms and in guiding means thereof
EP1479808A2 (en) * 2003-05-20 2004-11-24 NV Michel van de Wiele Method and device for taking over a weft yarn by a gripper rapier from a donor rapier
BE1015528A3 (en) * 2003-05-20 2005-05-03 Wiele Michel Van De Nv Method and device for taking over of an impact by a thread receives grab a gevergrjper.
EP1479808A3 (en) * 2003-05-20 2005-11-09 NV Michel van de Wiele Method and device for taking over a weft yarn by a gripper rapier from a donor rapier
WO2007039244A2 (en) * 2005-10-01 2007-04-12 Sultex Ag Method for supporting a weft thread guiding element
EP1777330A1 (en) * 2005-10-01 2007-04-25 Markus Farner Method for supporting a weft guide element
WO2007039244A3 (en) * 2005-10-01 2007-10-11 Markus Farner Method for supporting a weft thread guiding element
EP2829646A1 (en) * 2013-07-24 2015-01-28 SCHÖNHERR Textilmaschinenbau GmbH Weft insertion system, reed, rapier and weaving machine comprising such elements
CN104342825A (en) * 2013-07-24 2015-02-11 圣豪纺织机械有限公司 Weft insertion system, reed, rapier and weaving machine comprising such elements
US9359700B2 (en) 2013-07-24 2016-06-07 Schonherr Textilmaschinenbau Gmbh Weft insertion system and weaving machine comprising such a system
CN104342825B (en) * 2013-07-24 2018-01-26 史陶比尔拜罗伊特股份有限公司 Weft insertion system and the weaving loom including the system

Also Published As

Publication number Publication date
FR2737897B1 (en) 1997-09-19
FR2737897A1 (en) 1997-02-21
DE69603553D1 (en) 1999-09-09
DE69603553T2 (en) 1999-11-25
ATE182930T1 (en) 1999-08-15
ES2134575T3 (en) 1999-10-01
JPH09111592A (en) 1997-04-28
EP0759484B1 (en) 1999-08-04

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