EP0759484B1 - Weft insertion device for a gripper loom - Google Patents

Weft insertion device for a gripper loom Download PDF

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Publication number
EP0759484B1
EP0759484B1 EP96420264A EP96420264A EP0759484B1 EP 0759484 B1 EP0759484 B1 EP 0759484B1 EP 96420264 A EP96420264 A EP 96420264A EP 96420264 A EP96420264 A EP 96420264A EP 0759484 B1 EP0759484 B1 EP 0759484B1
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EP
European Patent Office
Prior art keywords
ribbon
longitudinal axis
permanent magnets
symmetry
plane
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Expired - Lifetime
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EP96420264A
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German (de)
French (fr)
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EP0759484A1 (en
Inventor
Christophe Saint Sulpice
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ICBT Diederichs SAS
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ICBT Diederichs SAS
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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 looms, more particularly weaving looms whose insertion of the weft thread is ensured by spears. More specifically, it aims to improve in the device for guiding said lances through the crowd.
  • the leaf receives, so known, two spears which run symmetrically through the crowd, with one edge fabric, to the center, in an alternating movement.
  • Each lance has at its free end a clamp capable of grasping thread.
  • the so-called “input” pliers grip the wire on an edge of the fabric to bring it to the center of the crowd, where it exchanges it with the so-called clamp “outlet” which leads the weft thread to the opposite edge of the fabric.
  • this solution does not present a means allowing a centering of the clamp relative to the guide means, which may prove annoying when using pliers eccentric to the tape, this which is the case in particular with the pliers commonly called “pliers positive ".
  • the wide shape of the metallic elements embedded in the tape does not allow for high precision lateral guidance, so that we know that this is a critical point, especially with regard to concerns 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 relative to the wing, which is light and easily integrated into a loom, while ensuring precise centering of the lance relative to the leaf.
  • the invention relates to a device for inserting the weft thread, usable on rapier weaving looms, each of the spears being composed pliers and a ribbon, in which the ribbons move by reciprocating movement from both sides of the fabric as it enters approximately the same distance in the crowd so that the clamps transmit said frame, said spears traversing the crowd by sliding on a fault integral with the leaf and flush with the wires of the lower tablecloth of the crowd, and in which the guidance of said spears relative to the leaf is magnetically secured by an element in ferromagnetic material and a plurality of permanent magnets arranged on the ribbon and on the leaf.
  • the clamp is guided by the interaction between magnets placed on the ribbon and a metal element located under the breakdown.
  • the magnet and the workpiece slender attract each other, so that the clamp remains on the trajectory corresponding to the minimum distance between the magnet and said element slender.
  • each magnet is grouped on the longitudinal axis tape, while the area of the elongate element likely to be the strongest attraction by the magnet, is also located in relation to the axis longitudinal of the ribbon.
  • the magnet-element assembly elongated naturally tends to come to face the axis longitudinal of the ribbon with the thickest area of the element long, which allows optimal centering and self-correcting.
  • the shape of the characteristic elements means that the position balance is automatically centered.
  • permanent magnets marry a disc shape while the ferromagnetic element marries a cylinder shape.
  • the ribbon has recessed areas in which come insert the magnetic discs.
  • the leaf has a longitudinal groove whose opening is directed under the purlin and in which is housed the ferromagnetic element.
  • 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 chain wire 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 loom on which is installed the invention 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 pliers (7) able to take the weft thread from one edge of the fabric to crowd center.
  • the invention can be applied indifferently to lances equipped with so-called “positive” pliers and in which the exchange of the weft thread between the clamps is carried out by actuation of an external member on the pliers, as with so-called pliers "negative” in which the exchange of the weft thread is carried out by tearing. In this way, we will not describe here in detail the precise structure pliers.
  • the tape (8) on which is fixed the clamp 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 imprints of 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 planar faces ribbon (8).
  • the magnets used are in rare earths and have a diameter of thirteen millimeters and a thickness of four millimeters.
  • the leaf (1) has an extension (10) made of 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 breakdown.
  • this breakdown (3) receives the tablecloth lower (4) of the crowd which penetrates slightly inside the hairs.
  • this profile is made of a non-material magnetizable, 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 in below the purlin (3), a longitudinal housing (11) in which is inserted a cylindrical bar (12) of ferromagnetic material, by example in soft iron or steel.
  • the groove (11) is arranged in the center of the upper face of the profile (10).
  • the bar ferromagnetic (12) has a maximum thickness according to the plane longitudinal median (14) of the purlin.
  • this cylinder typically is four millimeters.
  • the guide device has the following significant advantages: on the one hand, it allows the lance to be guided over the tip without the use of hooks entering the crowd. On the other hand, the geometry of the elements magnetic 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 looms, more particularly weaving looms whose insertion of the weft thread is ensured by spears. More specifically, it aims to improve 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, so known, two spears which run symmetrically through the crowd, with one edge 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 thread. The so-called "input" pliers grip the wire on an edge of the fabric to bring it to the center of the crowd, where it exchanges it with the so-called clamp "outlet" which leads the weft thread to the 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 looms in which the lances are rigid and whose guidance is provided by a sheath placed in lateral overflow of the clapper. This insertion device works without any crowd-level guidance, 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, for cause reciprocating motion, braking organs and consequent acceleration.

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 entraíné 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 congestion problem, we proposed using lances made up of pliers and flexible tape to rack driven by the machine. During the movement of the lance, the ribbon is curved in such a way that it does not increase the size of the machine. The use of this type of flexible tape poses the problem of guiding the gripper 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 chaíne, ce qui diminue notoirement les capacités de la machine.To solve this problem, we have in a known manner, under the lower layer forming the crowd, a track of polypropylene bristles stuck on an adhesive strip and on which the lance rests. This track, or breakdown, supports the movement of the ribbon 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 directed inward of the breakdown. It goes without saying that the passage of these hooks through the crowd can cause risks of breakage of the chain wires, which reduces notoriously the capabilities 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 chaíne autour des crochets provoque l'entraínement de ces dépôts noirs ce qui génère des zones sales dans le tissu.Another drawback inherent in the use of hooks guide of the ribbon, results from the mechanical structure of said ribbon. Indeed, the mechanical rigidity of the ribbon is given by fiber cores carbon well known for their solidity. When passing the ribbon to inside the hooks, friction causes the deposition of a certain amount of carbon on the inside of the hooks. It follows that on the one hand the ribbons wear out and on the other hand, the passage of the threads of chain around the hooks causes the entrainment of these black deposits 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 the invention therefore arises 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.It has been proposed in document FR 2 244 852 corresponding to document US 3 957 089, the use of a guide device working magnetically. The solution is to install in the leaf, an electromagnet with side plates allowing the magnetic field to close through the gripper trajectory. So when the electromagnet is energized, the magnetic field keeps the clamp between the two aforementioned sheets. This solution eliminates the presence of hooks, but requires an electromagnet with a large mass, and which also requires provide food. We therefore understand that this solution is not easily integrated into a classic loom leaf.

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 present a means allowing a centering of the clamp relative to the guide means, which may prove annoying when using pliers eccentric to the tape, this which is the case in particular with the pliers commonly called "pliers positive ".

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 4 126 159 to use magnetic means for causing an attraction of the leaf on the ribbon. More specifically, this document describes a solution in which the lateral ends of the leaf include electromagnets intended to attract the clip placed at the end of the ribbon, to prevent this last does not come off the tip when the clamp reaches the edges of the beating. This solution does not dispense with 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 beating with two magnets arranged at the level of the meeting area of clips, while the ribbon has a set of metallic elements as light as possible embedded in its thickness at the level of the connection with the clamp. Thus, at the end of its course on the purlin, the ribbon undergoes, when the metallic elements are opposite the elements located on the wing, an attraction which ensures a certain stabilization. Unfortunately, the discrete and localized distribution of the elements metal and magnets, results in a fluctuation in the intensity of the force of attraction during the path of the clamp, which constitutes instability factors.

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 metallic elements embedded in the tape does not allow for high precision lateral guidance, so that we know that this is a critical point, especially with regard to concerns 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 relative to the wing, which is light and easily integrated into a loom, while ensuring precise centering of the lance relative to the leaf.

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 inserting the weft thread, usable on rapier weaving looms, each of the spears being composed pliers and a ribbon, in which the ribbons move by reciprocating movement from both sides of the fabric as it enters approximately the same distance in the crowd so that the clamps transmit said frame, said spears traversing the crowd by sliding on a fault integral with the leaf and flush with the wires of the lower tablecloth of the crowd, and in which the guidance of said spears relative to the leaf is magnetically secured by an element in ferromagnetic material and a plurality of permanent magnets arranged on the ribbon 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 ribbon along the longitudinal axis of the latter, the element made of ferromagnetic material being continuous, elongated and arranged under the purlins facing the longitudinal axis of the ribbon,
  • 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 clamp is guided by the interaction between magnets placed on the ribbon and a metal element located under the breakdown. As the gripper advances, the magnet and the workpiece slender attract each other, so that the clamp remains on the trajectory corresponding to the minimum distance between the magnet and said element slender.

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 tape, while the area of the elongate element likely to be the strongest attraction by the magnet, is also located in relation to the axis longitudinal of the ribbon. In this way, the magnet-element assembly elongated naturally tends to come to face the axis longitudinal of the ribbon with the thickest area of the element long, which allows optimal centering and self-correcting. In in other words, the shape of the characteristic elements means that the position balance 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, permanent magnets marry a disc shape while the ferromagnetic element marries a cylinder shape.

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 in which come insert the magnetic discs. At the same time, the leaf has a longitudinal groove whose opening is directed under the purlin and in which is housed the ferromagnetic element.

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 will emerge clearly from the description of an embodiment particular illustrated in 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 chaíne 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 chain wire 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. So, as seen in Figure 1, the traditional loom on which is installed the invention 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 pliers (7) able to take the weft thread from one edge of the fabric to crowd center. It goes without saying that the invention can be applied indifferently to lances equipped with so-called "positive" pliers and in which the exchange of the weft thread between the clamps is carried out by actuation of an external member on the pliers, as with so-called pliers "negative" in which the exchange of the weft thread is carried out by tearing. In this way, we will not describe here in detail the precise structure pliers.

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 seen in Figure 1, the tape (8) on which is fixed the clamp, 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 imprints of 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 planar faces 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 in 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 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 breakdown. When the crowd (5) is open, this breakdown (3) receives the tablecloth lower (4) of the crowd which penetrates slightly inside the hairs.

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 functioning of the guidance system, it it is of course necessary that this profile is made of a non-material magnetizable, 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 in below the purlin (3), a longitudinal housing (11) in which is inserted a cylindrical bar (12) of ferromagnetic material, by example in 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.In accordance with another characteristic of the invention, the bar ferromagnetic (12) has a maximum thickness according to the plane longitudinal median (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 element ferromagnetic (12) are symmetrically distributed on either side of the longitudinal axis of the ribbon (8). The position illustrated in Figure 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 failure (3), as the maximum magnetization of the magnet is directed according to the longitudinal axis (13) of the ribbon (8), the latter is subjected to forces of recall which tend to align said magnetization with the maximum thickness of the ferromagnetic bar (12). We thus obtain a phenomenon self-centering particularly advantageous for guidance.

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 follows from the above that the guide device according to the invention has the following significant advantages: on the one hand, it allows the lance to be guided over the tip without the use of hooks entering the crowd. On the other hand, the geometry of the elements magnetic ensures self-centering of the ribbon on the leaf.

Claims (8)

  1. Device for inserting the weft thread, the said device being capable of being used on rapier weaving machines, each of the rapiers (6) being composed of a gripper (7) and of a ribbon (8), in which the ribbons (8) are displaced in an alternating movement from the two sides of the fabric, at the same time penetrating substantially the same distance into the shed (5), so that the grippers (7) transfer the said weft to one another, the said rapiers (6) travelling along the shed (5) by sliding on a panne (3) integral with the sley (1) and flush under the threads (4) of the lower sheet (4) of the shed, and in which the said rapiers (6) are guided relative to the sley (1) magnetically by an element (12) made of ferromagnetic material and a plurality of permanent magnets (9) arranged on the ribbon (8) and on the sley (1), characterized:
    in that the permanent magnets (9) are located on the ribbon (8) along the longitudinal axis of the latter, the element of ferromagnetic material being continuous, elongate and arranged below the panne (3) and opposite the longitudinal axis of the ribbon,
    in that each magnet comprises a plane of symmetry (13) parallel to the magnetization direction and to the longitudinal axis of the ribbon (8) and has a maximum length located in its plane of symmetry (13),
    and in that the ferromagnetic element comprises a plane of symmetry (14) parallel to the magnetization direction and to the longitudinal axis of the ribbon (8) and has a maximum thickness located in its plane of symmetry (13).
  2. Device according to Claim 1, characterized in that the permanent magnets (9) take the form of a disc.
  3. Device according to Claim 1, characterized in that the ferromagnetic element (12) takes the form of a cylinder.
  4. Device according to one of Claims 1 to 3, characterized in that the sley (1) comprises a longitudinal groove (11), the orifice of which is directed under the panne (3) and in which the ferromagnetic element (12) is accommodated.
  5. Device according to one of Claims 1 to 4, characterized in that the ribbon (8) has recessed zones in which the permanent magnets (9) are accommodated.
  6. Device according to Claim 2, characterized in that the diameter of each permanent-magnetic disc (9) is between five and twenty millimetres, and in that the thickness of each disc is between one and ten millimetres.
  7. Device according to Claim 3, characterized in that the diameter of the cylinder (12) of ferromagnetic material is between three and ten millimetres.
  8. 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
FR9510029 1995-08-18
FR9510029A FR2737897B1 (en) 1995-08-18 1995-08-18 DEVICE FOR INSERTING THE WEFT YARN ON A NOZZLE WEAVING MATERIAL

Publications (2)

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

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96420264A Expired - Lifetime EP0759484B1 (en) 1995-08-18 1996-08-02 Weft insertion device for a gripper loom

Country Status (6)

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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)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60220788T2 (en) * 2002-08-30 2008-03-06 Promatech S.P.A., Colzate Improvements to weft grippers for weaving machines and looms with guiding means therefor
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.
EP1777330A1 (en) * 2005-10-01 2007-04-25 Markus Farner Method for supporting a weft guide element
EP2829646B1 (en) * 2013-07-24 2017-09-06 STÄUBLI BAYREUTH GmbH Weft insertion system and weaving machine comprising such a system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT993929B (en) * 1973-09-24 1975-09-30 Martinelli G PERFECTED FRAME WITHOUT SHUTTLE TYPE
US4126159A (en) * 1977-09-29 1978-11-21 Vercaemert Gerard A Apparatus and method for stabilizing rapiers
CH670461A5 (en) * 1986-02-10 1989-06-15 Sulzer Ag

Also Published As

Publication number Publication date
DE69603553T2 (en) 1999-11-25
DE69603553D1 (en) 1999-09-09
ES2134575T3 (en) 1999-10-01
EP0759484A1 (en) 1997-02-26
ATE182930T1 (en) 1999-08-15
JPH09111592A (en) 1997-04-28
FR2737897A1 (en) 1997-02-21
FR2737897B1 (en) 1997-09-19

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