EP0633337A1 - Clamp for a weft insertion device in a weaving loom - Google Patents

Clamp for a weft insertion device in a weaving loom Download PDF

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Publication number
EP0633337A1
EP0633337A1 EP94420193A EP94420193A EP0633337A1 EP 0633337 A1 EP0633337 A1 EP 0633337A1 EP 94420193 A EP94420193 A EP 94420193A EP 94420193 A EP94420193 A EP 94420193A EP 0633337 A1 EP0633337 A1 EP 0633337A1
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EP
European Patent Office
Prior art keywords
lever
weft
frame
main
retaining device
Prior art date
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Granted
Application number
EP94420193A
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German (de)
French (fr)
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EP0633337B1 (en
Inventor
Didier Réidence Duplessis Marizy
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ICBT Diederichs SAS
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ICBT Diederichs SAS
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Publication of EP0633337A1 publication Critical patent/EP0633337A1/en
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Publication of EP0633337B1 publication Critical patent/EP0633337B1/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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/23—Thread grippers

Definitions

  • the present invention relates to an improved gripper, for a set for taking up and feeding the weft on a positive transfer weaving machine, using insertion members such as lances or ribbons provided with grippers at their ends, with exchange of the weft from one clamp to another in the middle of the fabric being formed.
  • the weft is taken and clamped by its end in the clamp of the lance or of the ribbon situated on the side of the feed, and usually it is furthermore held on this clamp by a retaining device, in order to be presented in good condition to the pulling pliers carried by the other lance or ribbon.
  • a first known retaining device is a simple fixed fork, located on the side of the clamp opposite the device carrying out the gripping and tightening of the frame. This fork guides the frame without trapping it.
  • the drawback of this retaining device lies in the fact that the inertia of the frame causes it to leave its position in the exchange phase, due to the formation of a wire loop.
  • a second known retaining device created to overcome the drawback of the first, comprises a single locking lever, the pivoting of which is controlled simultaneously with the opening-closing of the clamp itself.
  • the locking lever thus cooperates with a fixed counterpart, to effectively hold the frame when it is clamped in the clamp.
  • the drawback of this second device lies in its limits of use, in particular in its inability to adapt to very large wefts or fancy yarns.
  • the present invention aims to eliminate this last drawback, by providing a clamp with improved retaining device, applicable in particular to very large wefts or fancy yarns.
  • the invention essentially relates to a clamp for weft feeding assembly on a weaving machine, of the kind indicated in the introduction, this clamp which brings the weft to the exchange point comprising, in addition to a device main weft clamping device, a weft retaining device located on the side of the main weft clamping device, the weft retaining device comprising a first lever mounted pivoting along a transverse axis, a second lever pivotally mounted substantially in the same plane as the first along a transverse axis, and means for controlling the simultaneous pivoting and in opposite directions of the two levers, in the direction of their separation in synchronism with the opening of the main clamping device, and in the direction of their approximation in synchronism with the closing of the main clamping device, the two levers being shaped towards their respective free ends, to provide a free passa important to the weft in the open position, and to completely surround the weft in the closed position.
  • the invention provides a double lever mechanism, offering in the open position a greater free passage for the grip of the frame by the retaining device, while ensuring a total maintenance of the frame in the closed position.
  • the two levers of the weft retaining device are pivotally mounted along separate transverse axes, located one in front of the other, the pivot axis of the first lever being common with that of a lever of the main clamping device and these two levers being linked in rotation, while the axis pivoting of the second lever of the retaining device is located at an intermediate point of this lever, which is mechanically linked to the first lever by the cooperation of a drive shaft and a hole, the drive shaft being carried by the first lever, at an intermediate point, and the hole crossed by this axis being formed in the posterior region of the second lever, or vice versa.
  • the first lever of the retainer is directly controlled by the main lever of the clamp, and the second lever of the retainer is itself actuated from the first lever of the retainer, by a very simple and inexpensive mechanism. cumbersome ensuring the reversal of the direction of pivoting.
  • the first lever of the weft retaining device has, towards its free end, a notch open in the direction of the free end of the second lever, which comprises a cut whose edge partially covers the 'notch in closed position, to define a kind of eyelet crossed by the frame.
  • the clamp shown in the drawing comprises an elongated body 1 shown partially, intended to be fixed to a end of a lance or a ribbon situated on the side of the feed of the weft 2.
  • This clamp thus serves to take the end of the weft 2, and to drive it to the middle of the fabric being formed, where an exchange takes place with another clamp not directly concerned by the present invention.
  • the body 1 of the clamp comprises, at its front end, means for gripping the frame 2 comprising a fixed jaw 3 and a movable jaw 4, located opposite one another.
  • the movable jaw 4 is carried by the front end of a main lever 5, pivotally mounted around a transverse axis 6.
  • the rear end of the lever 5 is biased by a spring (not shown) in the closing direction of the clamp, that is to say of the approximation of the jaws 3 and 4.
  • the cooperation of the rear end of the lever 5 with a fixed cam makes it possible to control the opening of the clamp, with the jaws 3 and 4 moving away , against the action of the aforementioned jurisdiction.
  • the weft retaining device is located on the side of the clamp itself. This retaining device 7 maintains the frame 2 at a point 8, located behind point 9 clamped between the jaws 3 and 4, so that between the two points 8 and 9, the frame 2 has a section transverse 10, oriented obliquely, facilitating its recovery by the other clamp.
  • the retaining device 7 comprises an upper lever 11 and a lower lever 12, the respective arms of which in the form of blades, situated substantially in the same plane, are placed under a lateral part 13, also in the form of a blade, which is fixed. that is to say, integral with the body 1 of the clamp.
  • the upper lever 11 comprises a split hub 14, mounted around the axis 6 of the aforementioned main lever 5, and immobilized in rotation on this axis 6 by means of a clamping screw 15. Near its free end and on its edge lower, the upper lever 11 has a notch 16 open downwards.
  • the lower lever 12 is pivotally mounted, on the fixed lateral part 13, around an intermediate axis 17 parallel to the axis 6 and situated in front of the latter.
  • the free front end of the lower lever 12 has a special cutout 18, open towards the front and upwards.
  • the lower lever 12 is linked to the upper lever 11 by means of a small transverse axis 19 passing through a slightly elongated hole 20, the axis 19 being integral with the upper lever 11 and the hole 20 being formed in the lever lower 12, or vice versa.
  • the upper lever 11 of the retaining device 7 is linked in rotation with the main lever 5 of the clamp, via the axis 6, and it thus describes the same pivoting movements as the main lever 5.
  • the connection by the axis 19 and the hole 20, between the two levers 11 and 12 of the retaining device 7, imposes on the lower lever 12 pivoting movements around the axis 17, in the opposite direction of rotation from that common to the main lever 5 and the upper lever 11.
  • notch 16 of the upper lever 11 is located in correspondence with the cutout 18 of the lower lever 12.
  • the main lever 5 When the clamp itself must be brought into the open position for gripping the frame 2 (FIGS. 1 and 3), the main lever 5 is pivoted so that the movable jaw 4 is spaced from the fixed jaw 3. At this angular position of the main lever 5, it corresponds to a raised position of the upper lever 11 of the retaining device 7. Due to the connection provided by the pin 19 and the hole 20, the raising of the upper lever 11 is accompanied by a lowering of the lever lower 12 of retainer 7, which pivots about its axis 17. The notch 16 of the upper lever 11 is then removed from the cutout 18 of the lower lever 12.
  • the retainer 7 is wide open, and it can easily receive the frame 2, at the same time as it engages between the two jaws 3 and 4 of the clamp to be gripped.
  • the main lever 5 In the closed position for bringing towards the exchange point (FIGS. 2 and 4), the main lever 5 is pivoted so that the weft 2 is clamped at point 9 between the two jaws 3 and 4. At this angular position of the main lever 5, it corresponds to a lowered position of the upper lever 11 of the retaining device 7. Due to the connection provided by the pin 19 and the hole 20, the lowering of the upper lever 11 is accompanied by a raising of the lower lever 12 of the retainer 7, which pivots about its axis 17. The two levers 11 and 12 then partially overlap, and the notch 16 of the upper lever 11 is partially covered by the edge of the cutout 18 of the lower lever 12. A kind of eyelet 21 is therefore formed, which is crossed by the frame 2, which is thus surrounded on all sides and perfectly retained at its point 8.

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

Abstract

The invention relates to an assembly for the take-up and feed of the weft on a positive-transfer weaving machine, using insertion members, such as lances or bands, equipped with grippers, with exchange in the middle of the forming fabric. The gripper which feeds the weft (2) to the exchange point comprises, in addition to a main device (3, 4, 5) for clamping the weft, a weft-retention device (7) located on the same side as the main clamping device. The retention device (7) comprises two levers (11, 12) mounted pivotably in the same plane along respective transverse axes (6, 17) and describing simultaneous and opposed pivoting movements by means of a suitable mechanical connection (19, 20), in order to offer a wide passage for the weft (2) in the open position, whilst holding it effectively in the closed position. This gripper is used particularly for very coarse wefts or wefts consisting of fancy thread. <IMAGE>

Description

La présente invention concerne une pince améliorée, pour un ensemble de prise et d'amenée de la trame sur une machine à tisser à transfert positif, utilisant des organes d'insertion tels que des lances ou des rubans munis de pinces à leurs extrémités, avec échange de la trame d'une pince à une autre au milieu du tissu en formation.The present invention relates to an improved gripper, for a set for taking up and feeding the weft on a positive transfer weaving machine, using insertion members such as lances or ribbons provided with grippers at their ends, with exchange of the weft from one clamp to another in the middle of the fabric being formed.

Dans un tel ensemble, la trame est prise et serrée par son extrémité dans la pince de la lance ou du ruban situé du côté de l'amenée, et habituellement elle est en outre maintenue sur cette pince par un dispositif de retenue, afin d'être présentée dans de bonnes conditions à la pince tirante portée par l'autre lance ou ruban.In such an assembly, the weft is taken and clamped by its end in the clamp of the lance or of the ribbon situated on the side of the feed, and usually it is furthermore held on this clamp by a retaining device, in order to be presented in good condition to the pulling pliers carried by the other lance or ribbon.

On connaît actuellement deux types de dispositifs de retenue de la trame pour ce genre de pince.Two types of weft retaining devices are currently known for this type of clamp.

Un premier dispositif de retenue connu est une simple fourche fixe, située sur le côté de la pince opposé au dispositif réalisant la prise et le serrage de la trame. Cette fourche guide la trame sans l'emprisonner. L'inconvénient de ce dispositif de retenue réside dans le fait que l'inertie de la trame lui fait quitter sa position dans la phase d'échange, en raison de la formation d'une boucle de fil.A first known retaining device is a simple fixed fork, located on the side of the clamp opposite the device carrying out the gripping and tightening of the frame. This fork guides the frame without trapping it. The drawback of this retaining device lies in the fact that the inertia of the frame causes it to leave its position in the exchange phase, due to the formation of a wire loop.

Un deuxième dispositif de retenue connu, créé pour pallier à l'inconvénient du premier, comporte un levier de verrouillage unique, dont le pivotement est commandé simultanément à l'ouverture-fermeture de la pince proprement dite. Le levier de verrouillage coopère ainsi avec une contrepartie fixe, pour maintenir efficacement la trame lorsque celle-ci est serrée dans la pince. L'inconvénient de ce deuxième dispositif réside dans ses limites d'utilisation, notamment dans son incapacité à s'adapter à des trames très grosses ou en fil fantaisie.A second known retaining device, created to overcome the drawback of the first, comprises a single locking lever, the pivoting of which is controlled simultaneously with the opening-closing of the clamp itself. The locking lever thus cooperates with a fixed counterpart, to effectively hold the frame when it is clamped in the clamp. The drawback of this second device lies in its limits of use, in particular in its inability to adapt to very large wefts or fancy yarns.

La présente invention vise à éliminer ce dernier inconvénient, en fournissant une pince avec dispositif de retenue amélioré, applicable en particulier aux trames très grosses ou en fil fantaisie.The present invention aims to eliminate this last drawback, by providing a clamp with improved retaining device, applicable in particular to very large wefts or fancy yarns.

A cet effet, l'invention a essentiellement pour objet une pince pour ensemble d'amenée de trame sur une machine à tisser, du genre indiqué en introduction, cette pince qui amène la trame jusqu'au point d'échange comprenant, outre un dispositif principal de serrage de la trame, un dispositif de retenue de la trame situé sur le côté du dispositif principal de serrage, le dispositif de retenue de la trame comprenant un premier levier monté pivotant suivant un axe transversal, un second levier monté pivotant sensiblement dans le même plan que le premier suivant un axe transversal, et des moyens de commande de pivotement simultané et en sens opposés des deux leviers, dans le sens de leur écartement en synchronisme avec l'ouverture du dispositif principal de serrage, et dans le sens de leur rapprochement en synchronisme avec la fermeture du dispositif principal de serrage, les deux leviers étant conformés, vers leurs extrémités libres respectives, pour offrir un libre passage important à la trame en position ouverte, et pour entourer entièrement la trame en position fermée.To this end, the invention essentially relates to a clamp for weft feeding assembly on a weaving machine, of the kind indicated in the introduction, this clamp which brings the weft to the exchange point comprising, in addition to a device main weft clamping device, a weft retaining device located on the side of the main weft clamping device, the weft retaining device comprising a first lever mounted pivoting along a transverse axis, a second lever pivotally mounted substantially in the same plane as the first along a transverse axis, and means for controlling the simultaneous pivoting and in opposite directions of the two levers, in the direction of their separation in synchronism with the opening of the main clamping device, and in the direction of their approximation in synchronism with the closing of the main clamping device, the two levers being shaped towards their respective free ends, to provide a free passa important to the weft in the open position, and to completely surround the weft in the closed position.

Ainsi, l'invention propose un mécanisme à double levier, offrant en position ouverte un libre passage plus important pour la prise de la trame par le dispositif de retenue, tout en assurant un maintien total de la trame en position fermée.Thus, the invention provides a double lever mechanism, offering in the open position a greater free passage for the grip of the frame by the retaining device, while ensuring a total maintenance of the frame in the closed position.

Selon une forme de réalisation préférée de l'invention, les deux leviers du dispositif de retenue de la trame sont montés pivotants suivant des axes transversaux distincts, situés l'un en avant de l'autre, l'axe de pivotement du premier levier étant commun avec celui d'un levier du dispositif principal de serrage et ces deux leviers étant liés en rotation, tandis que l'axe de pivotement du second levier du dispositif de retenue est situé en un point intermédiaire de ce levier, lequel est lié mécaniquement au premier levier par la coopération d'un axe d'entraînement et d'un trou, l'axe d'entraînement étant porté par le premier levier, en un point intermédiaire, et le trou traversé par cet axe étant ménagé dans la région postérieure du second levier, ou vice versa. Ainsi, le premier levier du dispositif de retenue est directement commandé par le levier principal de la pince, et le second levier du dispositif de retenue est lui-même actionné à partir du premier levier du dispositif de retenue, par un mécanisme très simple et peu encombrant assurant l'inversion du sens de pivotement.According to a preferred embodiment of the invention, the two levers of the weft retaining device are pivotally mounted along separate transverse axes, located one in front of the other, the pivot axis of the first lever being common with that of a lever of the main clamping device and these two levers being linked in rotation, while the axis pivoting of the second lever of the retaining device is located at an intermediate point of this lever, which is mechanically linked to the first lever by the cooperation of a drive shaft and a hole, the drive shaft being carried by the first lever, at an intermediate point, and the hole crossed by this axis being formed in the posterior region of the second lever, or vice versa. Thus, the first lever of the retainer is directly controlled by the main lever of the clamp, and the second lever of the retainer is itself actuated from the first lever of the retainer, by a very simple and inexpensive mechanism. cumbersome ensuring the reversal of the direction of pivoting.

Selon une autre caractéristique de l'invention, le premier levier du dispositif de retenue de la trame présente, vers son extrémité libre, une encoche ouverte en direction de l'extrémité libre du second levier, laquelle comporte une découpe dont le bord recouvre partiellement l'encoche en position fermée, pour délimiter un genre d'oeillet traversé par la trame.According to another characteristic of the invention, the first lever of the weft retaining device has, towards its free end, a notch open in the direction of the free end of the second lever, which comprises a cut whose edge partially covers the 'notch in closed position, to define a kind of eyelet crossed by the frame.

De toute façon, l'invention sera mieux comprise à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme de réalisation de cette pince pour ensemble d'amenée de trame sur une machine à tisser :

  • Figure 1 est une vue en perspective d'une pince conforme à la présente invention, en position ouverte ;
  • Figure 2 est une vue de face de la pince de figure 1, toujours en position ouverte, avec coupe partielle montrant le mécanisme ;
  • Figure 3 est une vue en perspective de cette pince, en position fermée ;
  • Figure 4 est une vue de face similaire à figure 2, mais en position fermée.
In any case, the invention will be better understood with the aid of the description which follows, with reference to the appended diagrammatic drawing representing, by way of nonlimiting example, an embodiment of this clamp for weft feed assembly on a weaving machine:
  • Figure 1 is a perspective view of a clamp according to the present invention, in the open position;
  • Figure 2 is a front view of the clamp of Figure 1, still in the open position, with partial section showing the mechanism;
  • Figure 3 is a perspective view of this clamp, in the closed position;
  • Figure 4 is a front view similar to Figure 2, but in the closed position.

La pince représentée au dessin comprend un corps allongé 1 montré partiellement, prévu pour être fixé à une extrémité d'une lance ou d'un ruban situé du côté de l'amenée de la trame 2. Cette pince sert ainsi à prendre l'extrémité de la trame 2, et à l'entraîner jusqu'au milieu du tissu en formation, où s'effectue un échange avec une autre pince non directement concernée par la présente invention.The clamp shown in the drawing comprises an elongated body 1 shown partially, intended to be fixed to a end of a lance or a ribbon situated on the side of the feed of the weft 2. This clamp thus serves to take the end of the weft 2, and to drive it to the middle of the fabric being formed, where an exchange takes place with another clamp not directly concerned by the present invention.

Le corps 1 de la pince comporte, à son extrémité avant, des moyens de saisie de la trame 2 comprenant un mors fixe 3 et un mors mobile 4, situés en regard l'une de l'autre. Le mors mobile 4 est porté par l'extrémité avant d'un levier principal 5, monté pivotant autour d'un axe transversal 6. L'extrémité arrière du levier 5 est sollicitée par un ressort (non représenté) dans le sens de la fermeture de la pince, c'est-à-dire du rapprochement des mors 3 et 4. La coopération de l'extrémité arrière du levier 5 avec une came fixe permet de commander l'ouverture de la pince, avec éloignement des mors 3 et 4, à l'encontre de l'action du ressort précité.The body 1 of the clamp comprises, at its front end, means for gripping the frame 2 comprising a fixed jaw 3 and a movable jaw 4, located opposite one another. The movable jaw 4 is carried by the front end of a main lever 5, pivotally mounted around a transverse axis 6. The rear end of the lever 5 is biased by a spring (not shown) in the closing direction of the clamp, that is to say of the approximation of the jaws 3 and 4. The cooperation of the rear end of the lever 5 with a fixed cam makes it possible to control the opening of the clamp, with the jaws 3 and 4 moving away , against the action of the aforementioned jurisdiction.

Le dispositif de retenue de la trame, désigné dans son ensemble par le repère 7, est situé sur le côté de la pince proprement dite. Ce dispositif de retenue 7 assure le maintien de la trame 2 en un point 8, situé en arrière du point 9 serré entre les mors 3 et 4, de telle sorte qu'entre les deux points 8 et 9, la trame 2 possède un tronçon transversal 10, orienté obliquement, facilitant sa reprise par l'autre pince.The weft retaining device, generally designated by the reference 7, is located on the side of the clamp itself. This retaining device 7 maintains the frame 2 at a point 8, located behind point 9 clamped between the jaws 3 and 4, so that between the two points 8 and 9, the frame 2 has a section transverse 10, oriented obliquely, facilitating its recovery by the other clamp.

Le dispositif de retenue 7 comprend un levier supérieur 11 et un levier inférieur 12, dont les bras respectifs en forme de lames, situés sensiblement dans un même plan, sont placés sous une partie latérale 13, elle aussi en forme de lame, qui est fixe c'est-à-dire solidaire du corps 1 de la pince.The retaining device 7 comprises an upper lever 11 and a lower lever 12, the respective arms of which in the form of blades, situated substantially in the same plane, are placed under a lateral part 13, also in the form of a blade, which is fixed. that is to say, integral with the body 1 of the clamp.

Le levier supérieur 11 comporte un moyeu fendu 14, monté autour de l'axe 6 du levier principal 5 précité, et immobilisé en rotation sur cet axe 6 au moyen d'une vis de serrage 15. Près de son extrémité libre et sur son bord inférieur, le levier supérieur 11 présente une encoche 16 ouverte vers le bas.The upper lever 11 comprises a split hub 14, mounted around the axis 6 of the aforementioned main lever 5, and immobilized in rotation on this axis 6 by means of a clamping screw 15. Near its free end and on its edge lower, the upper lever 11 has a notch 16 open downwards.

Le levier inférieur 12 est monté pivotant, sur la partie latérale fixe 13, autour d'un axe intermédiaire 17 parallèle à l'axe 6 et situé devant ce dernier. L'extrémité libre avant du levier inférieur 12 comporte une découpe particulière 18, ouverte vers l'avant et vers le haut. Vers son extrémité arrière, le levier inférieur 12 est lié au levier supérieur 11 au moyen d'un petit axe transversal 19 traversant un trou 20 légèrement allongé, l'axe 19 étant solidaire du levier supérieur 11 et le trou 20 étant ménagé dans le levier inférieur 12, ou vice-versa.The lower lever 12 is pivotally mounted, on the fixed lateral part 13, around an intermediate axis 17 parallel to the axis 6 and situated in front of the latter. The free front end of the lower lever 12 has a special cutout 18, open towards the front and upwards. Towards its rear end, the lower lever 12 is linked to the upper lever 11 by means of a small transverse axis 19 passing through a slightly elongated hole 20, the axis 19 being integral with the upper lever 11 and the hole 20 being formed in the lever lower 12, or vice versa.

Le levier supérieur 11 du dispositif de retenue 7 est lié en rotation avec le levier principal 5 de la pince, par l'intermédiaire de l'axe 6, et il décrit ainsi les mêmes mouvements de pivotement que le levier principal 5. La liaison par l'axe 19 et le trou 20, entre les deux leviers 11 et 12 du dispositif de retenue 7, impose au levier inférieur 12 des mouvements de pivotement autour de l'axe 17, dans le sens de rotation inverse de celui commun au levier principal 5 et au levier supérieur 11.The upper lever 11 of the retaining device 7 is linked in rotation with the main lever 5 of the clamp, via the axis 6, and it thus describes the same pivoting movements as the main lever 5. The connection by the axis 19 and the hole 20, between the two levers 11 and 12 of the retaining device 7, imposes on the lower lever 12 pivoting movements around the axis 17, in the opposite direction of rotation from that common to the main lever 5 and the upper lever 11.

On notera encore que l'encoche 16 du levier supérieur 11 se situe en correspondance avec la découpe 18 du levier inférieur 12.It will also be noted that the notch 16 of the upper lever 11 is located in correspondence with the cutout 18 of the lower lever 12.

Le fonctionnement d'ensemble du dispositif, clairement illustré par le dessin, s'établit comme suit :The overall operation of the device, clearly illustrated by the drawing, is as follows:

Lorsque la pince proprement dite doit être amenée en position ouverte de prise de la trame 2 (figures 1 et 3), le levier principal 5 est pivoté de telle sorte que le mors mobile 4 soit écarté du mors fixe 3. A cette position angulaire du levier principal 5, il correspond une position relevée du levier supérieur 11 du dispositif de retenue 7. En raison de la liaison assurée par l'axe 19 et le trou 20, le relèvement du levier supérieur 11 s'accompagne d'un abaissement du levier inférieur 12 du dispositif de retenue 7, qui pivote autour de son axe 17. L'encoche 16 du levier supérieur 11 est alors éloignée de la découpe 18 du levier inférieur 12. Ainsi, le dispositif de retenue 7 est largement ouvert, et il peut facilement recevoir la trame 2, en même temps que celle-ci s'engage entre les deux mors 3 et 4 de la pince pour être saisie.When the clamp itself must be brought into the open position for gripping the frame 2 (FIGS. 1 and 3), the main lever 5 is pivoted so that the movable jaw 4 is spaced from the fixed jaw 3. At this angular position of the main lever 5, it corresponds to a raised position of the upper lever 11 of the retaining device 7. Due to the connection provided by the pin 19 and the hole 20, the raising of the upper lever 11 is accompanied by a lowering of the lever lower 12 of retainer 7, which pivots about its axis 17. The notch 16 of the upper lever 11 is then removed from the cutout 18 of the lower lever 12. Thus, the retainer 7 is wide open, and it can easily receive the frame 2, at the same time as it engages between the two jaws 3 and 4 of the clamp to be gripped.

En position fermée d'amenée vers le point d'échange (figures 2 et 4), le levier principal 5 est pivoté de telle sorte que la trame 2 soit serrée au point 9 entre les deux mors 3 et 4. A cette position angulaire du levier principal 5, il correspond une position abaissée du levier supérieur 11 du dispositif de retenue 7. En raison de la liaison assurée par l'axe 19 et le trou 20, l'abaissement du levier supérieur 11 s'accompagne d'un relèvement du levier inférieur 12 du dispositif de retenue 7, qui pivote autour de son axe 17. Les deux leviers 11 et 12 se chevauchent alors partiellement, et l'encoche 16 du levier supérieur 11 est partiellement recouverte par le bord de la découpe 18 du levier inférieur 12. Il est donc formé un genre d'oeillet 21, qui est traversé par la trame 2, laquelle se trouve ainsi entourée de tous côtés et parfaitement retenue à son point 8.In the closed position for bringing towards the exchange point (FIGS. 2 and 4), the main lever 5 is pivoted so that the weft 2 is clamped at point 9 between the two jaws 3 and 4. At this angular position of the main lever 5, it corresponds to a lowered position of the upper lever 11 of the retaining device 7. Due to the connection provided by the pin 19 and the hole 20, the lowering of the upper lever 11 is accompanied by a raising of the lower lever 12 of the retainer 7, which pivots about its axis 17. The two levers 11 and 12 then partially overlap, and the notch 16 of the upper lever 11 is partially covered by the edge of the cutout 18 of the lower lever 12. A kind of eyelet 21 is therefore formed, which is crossed by the frame 2, which is thus surrounded on all sides and perfectly retained at its point 8.

Il va de soi que l'invention ne se limite pas à la seule forme de réalisation de cette pince pour ensemble d'amenée de trame sur une machine à tisser qui a été décrite ci-dessus, à titre d'exemple ; elle en embrasse, au contraire, toutes les variantes constructives respectant le même principe. Ainsi, l'on ne s'éloignerait pas de l'esprit de l'invention en modifiant la liaison mécanique entre les leviers inférieur et supérieur du dispositif de retenue de la trame, du moment que cette liaison impose aux deux leviers des mouvements de pivotement simultanés et en sens opposés.It goes without saying that the invention is not limited to the sole embodiment of this clamp for weft feeding assembly on a weaving machine which has been described above, by way of example; on the contrary, it embraces all constructive variants respecting the same principle. Thus, one would not depart from the spirit of the invention by modifying the mechanical connection between the lower and upper levers of the weft retaining device, as long as this connection requires the two levers to pivot. simultaneous and in opposite directions.

Claims (3)

Pince pour ensemble de prise et d'amenée de la trame sur une machine à tisser à transfert positif, utilisant des organes d'insertion, tels que des lances ou des rubans munis de pinces à leurs extrémités, avec échange d'une pince à une autre au milieu du tissu en formation, la pince qui amène la trame (2) jusqu'au point d'échange comprenant, outre un dispositif principal de serrage (3,4,5) de la trame (2), un dispositif de retenue (7) de la trame (2) situé sur le côté du dispositif principal de serrage (3,4,5), caractérisée en ce que le dispositif de retenue (7) de la trame (2) comprend un premier levier (11) monté pivotant suivant un axe transversal (6), un second levier (12) monté pivotant sensiblement dans le même plan que le premier suivant un axe transversal (17), et des moyens de commande (6,14,15,19,20) de pivotement simultané et en sens opposés des deux leviers (11,12), dans le sens de leur écartement en synchronisme avec l'ouverture du dispositif principal de serrage (3,4,5), et dans le sens de leur rapprochement en synchronisme avec la fermeture du dispositif principal de serrage (3,4,5), les deux leviers (11,12) étant conformés, vers leurs extrémités libres respectives (16,18), pour offrir un libre passage important à la trame (2) en position ouverte, et pour entourer entièrement la trame (2) en position fermée.Pliers for weft gripping and feeding assembly on a positive transfer weaving machine, using insertion members, such as lances or ribbons provided with pliers at their ends, with exchange of a pliers at a other in the middle of the fabric being formed, the clamp which brings the weft (2) to the exchange point comprising, in addition to a main device for clamping (3,4,5) the weft (2), a retaining device (7) of the frame (2) located on the side of the main clamping device (3,4,5), characterized in that the frame retaining device (7) (2) comprises a first lever (11) pivotally mounted along a transverse axis (6), a second lever (12) pivotally mounted substantially in the same plane as the first along a transverse axis (17), and control means (6,14,15,19,20) simultaneous pivoting and in opposite directions of the two levers (11,12), in the direction of their spacing in synchronism with the opening of the main device tightening (3,4,5), and in the direction of their approximation in synchronism with the closing of the main tightening device (3,4,5), the two levers (11,12) being shaped, towards their free ends respective (16,18), to provide significant free passage to the frame (2) in the open position, and to completely surround the frame (2) in the closed position. Pince pour ensemble de prise et d'amenée de la trame selon la revendication 1, caractérisée en ce que les deux leviers (11,12) du dispositif de retenue (7) de la trame (2) sont montés pivotants suivant des axes transversaux distincts (6,17), situés l'un en avant de l'autre, l'axe de pivotement (6) du premier levier (11) étant commun avec celui d'un levier (5) du dispositif principal de serrage et ces deux leviers (11,5) étant liés en rotation, tandis que l'axe de pivotement (17) du second levier (12) du dispositif de retenue (7) est situé en un point intermédiaire de ce levier (12), lequel est lié mécaniquement au premier levier (11) par la coopération d'un axe d'entraînement (19) et d'un trou (20), l'axe d'entraînement (19) étant porté par le premier levier (11), en un point intermédiaire, et le trou (20) traversé par cet axe (19) étant ménagé dans la région postérieure du second levier (12), ou vice-versa.Pliers for weft gripping and feeding assembly according to claim 1, characterized in that the two levers (11,12) of the weft retaining device (7) (2) are pivotally mounted along distinct transverse axes (6,17), located one in front of the other, the pivot axis (6) of the first lever (11) being common with that of a lever (5) of the main clamping device and these two levers (11,5) being linked in rotation, while the pivot axis (17) of the second lever (12) of the retaining device (7) is located in a intermediate point of this lever (12), which is mechanically linked to the first lever (11) by the cooperation of a drive pin (19) and a hole (20), the drive pin (19) being carried by the first lever (11), at an intermediate point, and the hole (20) through which this axis (19) is formed in the posterior region of the second lever (12), or vice versa. Pince pour ensemble de prise et d'amenée de la trame selon la revendication 1 ou 2, caractérisée en ce que le premier levier (11) du dispositif de retenue (7) de la trame (2) présente, vers son extrémité libre, une encoche (16) ouverte en direction de l'extrémité libre du second levier (12), laquelle comporte une découpe (18) dont le bord recouvre partiellement l'encoche (16) en position fermée, pour délimiter un genre d'oeillet (21) traversé par la trame (2).Pliers for weft gripping and feeding assembly according to claim 1 or 2, characterized in that the first lever (11) of the weft retaining device (7) has, towards its free end, a notch (16) open towards the free end of the second lever (12), which includes a cutout (18) whose edge partially covers the notch (16) in the closed position, to delimit a kind of eyelet (21 ) crossed by the frame (2).
EP94420193A 1993-07-09 1994-07-08 Clamp for a weft insertion device in a weaving loom Expired - Lifetime EP0633337B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9308725 1993-07-09
FR9308725A FR2707304B1 (en) 1993-07-09 1993-07-09 Plier for weft feed set on a weaving machine.

Publications (2)

Publication Number Publication Date
EP0633337A1 true EP0633337A1 (en) 1995-01-11
EP0633337B1 EP0633337B1 (en) 1997-04-23

Family

ID=9449288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94420193A Expired - Lifetime EP0633337B1 (en) 1993-07-09 1994-07-08 Clamp for a weft insertion device in a weaving loom

Country Status (4)

Country Link
EP (1) EP0633337B1 (en)
DE (1) DE69402767T2 (en)
ES (1) ES2101471T3 (en)
FR (1) FR2707304B1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2202964A1 (en) * 1972-10-17 1974-05-10 Alsacienne Constr Meca
FR2210687A1 (en) * 1972-12-14 1974-07-12 Mackie & Sons Ltd J
DE2428009A1 (en) * 1973-06-15 1975-01-09 Mackie & Sons Ltd J WEFT INSERTION DEVICE FOR A SHUTTERLESS LOOM

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH482852A (en) * 1967-09-19 1969-12-15 Somet Soc Mec Tessile Pair of weft transport pliers for weaving looms with continuous weft feeding
FR2048284A5 (en) * 1969-12-17 1971-03-19 Dornier Gmbh Lindauer Shuttleless weaving loom

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2202964A1 (en) * 1972-10-17 1974-05-10 Alsacienne Constr Meca
FR2210687A1 (en) * 1972-12-14 1974-07-12 Mackie & Sons Ltd J
DE2428009A1 (en) * 1973-06-15 1975-01-09 Mackie & Sons Ltd J WEFT INSERTION DEVICE FOR A SHUTTERLESS LOOM

Also Published As

Publication number Publication date
DE69402767D1 (en) 1997-05-28
ES2101471T3 (en) 1997-07-01
EP0633337B1 (en) 1997-04-23
FR2707304B1 (en) 1995-08-11
DE69402767T2 (en) 1998-02-05
FR2707304A1 (en) 1995-01-13

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