EP0823501B2 - Method and device for the selection of the mobile hooks of a shedding mechanism and jacquard loom - Google Patents

Method and device for the selection of the mobile hooks of a shedding mechanism and jacquard loom Download PDF

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Publication number
EP0823501B2
EP0823501B2 EP97420133A EP97420133A EP0823501B2 EP 0823501 B2 EP0823501 B2 EP 0823501B2 EP 97420133 A EP97420133 A EP 97420133A EP 97420133 A EP97420133 A EP 97420133A EP 0823501 B2 EP0823501 B2 EP 0823501B2
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EP
European Patent Office
Prior art keywords
hook
hooks
point position
dead point
lever
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EP97420133A
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German (de)
French (fr)
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EP0823501A1 (en
EP0823501B1 (en
Inventor
Jean-Paul Froment
Dario Bassi
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Staeubli Lyon SA
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Staeubli Lyon SA
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/16—Verdol or other jacquards having intermediate power-operated needles between reading needles and lifting-hooks
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types

Definitions

  • the invention relates to a method and a device for selecting the movable hooks of a shedding mechanism of a Jacquard weaving loom and a Jacquard weaving loom comprising such a device.
  • a shedding mechanism selectively raises heddles comprising a grommet into which a warp thread passes, which thread is located, depending on the position of a hook to which the hoop is attached. upper end of the bar, above or below the weft yarn moved by the loom.
  • the mechanical properties of the harness must therefore be provided to allow the application of this additional vertical force downwards, which increases its manufacturing cost, as well as the mechanical recall devices that it includes and, more generally, mechanical drive parts that must be over-sized. In addition, this increases the wear phenomena of all the Jacquard mechanics and the harness. In addition, the efforts required to overcome the frictional forces are likely to generate vibrations in the trade, these vibrations may have negative consequences on the operation and life of the moving parts of the loom.
  • the main object of the invention is to solve these problems and to provide a method and a device for selecting the mobile hooks of the loom for optimizing the sizing of the harness and the mechanical parts for driving or elastic return, while maintaining the efficiency of a selection device with leveling.
  • the invention relates to a method for selecting the movable hooks of a shedding mechanism of a jacquard loom comprising at least one hook moved by a knife between a top dead center position, in or near which the hook can be immobilized by a selection device, and a bottom dead position.
  • a method and device are known to DE-A-37 24 686 .
  • the method of the invention is characterized in that it consists in exerting individually on said hook, during each passage of said hook in its top dead center position or close thereto, a force tending to return said hook towards its position of low dead point, this force being exerted on this hook only in the vicinity of its position of top dead center.
  • the forces thus exerted compensate the friction and inertia forces and it is no longer necessary for the harness to exert sufficient force on the movable hooks to overcome these, which makes it possible to simplify and lighten the construction of the loom and the harness.
  • the force exerted on the hook is chosen to be substantially equal to the resultant of the friction forces exerted by its environment on the hook and the forces of inertia. This effort substantially offsets the forces that oppose the change of direction of the hook at the top dead center of its trajectory.
  • the invention also relates to a device for implementing the method of the invention and, more specifically, a device for selecting the movable hooks of a shedding mechanism of a Jacquard loom comprising at least one less a hook moved by a knife between a top dead center position, in or near which the hook can be immobilized by a selection device, and a bottom dead position, characterized in that it comprises means for elastic stop of said hook in its top dead center position, said means being able to exert individually on said hook during each passage of said hook in its top dead center position or close thereto and only in the vicinity of this position, a force tending to return said hook to its bottom dead center position.
  • the device of the invention thus makes it possible to substantially cancel the effect of the friction and inertia forces applied to the hook when it is in its top dead center position or close thereto.
  • the force exerted by the elastic stop compensates for the inertia of the hook itself.
  • the invention makes it possible to apply directly to the movable hook the force which is necessary to put it in motion downwards from the top dead center of its trajectory.
  • the device comprises two hooks displaced alternately by two knives animated with reciprocating movement in opposition of phase, the elastic stop means being able to cooperate with said two hooks.
  • a single elastic stop means can be used for two hooks, which keeps the device of the invention a simple character.
  • the elastic stop means may comprise a lever able to be displaced against the force of a spring by the hook when it reaches its top dead center position.
  • the force exerted on the hook in its top dead center position, or close to it, according to the invention is, in this case, due to the elastic force of the spring.
  • the lever is adapted to be moved by the hooks when they reach their top dead center position. respectively.
  • the resilient stop means may comprise a torsion spring.
  • This torsion spring can be in direct contact with the hooks of the shedding mechanism, which allows to obtain, with a very low cost, the desired function.
  • the invention finally relates to a Jacquard loom comprising a selection device as previously described.
  • a warp 1 comes from a beam 2.
  • Each warp passes through the eyelet 3 has a smooth 3 to open the pitch to allow the passage of a pick to form the fabric that s 4.
  • the lower end of each loom is connected to the frame of the loom by a tension spring 5, while its upper end is secured to an arcade 6.
  • the arches are raised and lowered by means of a mechanism for forming the loom. the referenced crowd 7.
  • the shedding mechanism comprises a funicular member 8 at each end of which is associated a hook 9.
  • the hooks comprise a lateral nose 9a capable of cooperating with knives 10 animated vertical reciprocating movements in phase opposition.
  • the funicular element 8 passes around a first pulley 11 of a rudder 12 whose second pulley 13 is surrounded by one of the arches 6.
  • the end thereof opposite to that which is connected to the stringer 3 is anchored to a fixed point 14 of the frame of the machine.
  • the upper part of the mechanism 7 is provided with retaining hooks in the form of levers 15 and belonging to a selection device.
  • the levers 15 are associated with a single electromagnet 16, so that when the electromagnet is energized, the levers are moved toward the center or held pressed against the electromagnet 16 after being moved by a hook 9.
  • the curved ends of the lower branches 15 has levers 15 cooperating with the upper curved ends 9b of the hooks 9 in order to immobilize them in their top dead center position or close to it, in the situation where is represented the hook of the left part of the figure 2 while the hook of the right part is shown in the bottom dead center position.
  • Each lever 15 is articulated about a pivot 18 and includes a lower arm 15 is intended to cooperate with the upper beak 9 b with a hook 9 and an upper leg 15 b to be moved or held in position by the electromagnetic force generated by the electromagnet 16.
  • the upper branch 15b of each lever 15 is kept away from the electromagnet 16 by a spring 19 which is compressed when the upper nozzle 9b of the hook 9 moves the lower end of the leg 15 a of the lever 15 upon arrival of the hook 9 in its dead center position .
  • the hook 9 In the position of the figure 3 the hook 9 is immobilized in position because it can not come back down under the effect of the traction exerted on it by the funicular element 8 because of the blocking made by the lever 15 under the effect of the spring 19.
  • the hook 9 is slightly lifted so that its upper beak 9 b escapes the leg 15 a of the lever 15. If the electromagnet 16 is activated at this time the leg 15 a is held away from the spout 9 and b is not opposed to the spout 9 of the movement downwards bearing on the knife 10. on the contrary, if the electromagnet 16 is not activated, the spring 19 pushes the lever 15 towards its engagement position with the spout 9 b .
  • the top dead center position of the hook 9 is located above the upper position of the figure 4 .
  • the cutter 10 pushes the hook 9 upwards to release the hook 9 b with respect to the end of the leg 15 a of the lever 15.
  • the hook 9 is in contact with a stop 20 formed by a cam lever has two extensions 20 a and 20 b adapted to bear against the hooks 9 when they are in their top dead point position or close to it -this.
  • the abutment or lever 20 rests on two axes 21 and 22 fixed relative to the housing of the shedding mechanism 7.
  • the lever 20 is supported on the pins 21 and 22 by a spring 23 disposed above the lever 20, c that is to say on the opposite side to the axes 21 and 22.
  • the movement of the knife 10 moves the lever 20 towards the position shown in FIG. figure 4 against the force of the spring 23.
  • the lever 20 constitutes an elastic abutment for the movement of the hook 9.
  • the forces F 1 and F 2 are substantially proportional to the force F 0 .
  • an inertial force proportional to the mass of the hook 9 opposes its downward movement.
  • the hook 9 is subjected to a force F 3 exerted by the end 20 a of the lever 20 due to the compression of the spring 23. Given the location of the lever 20, the force F 3 is exerted on the hook 9 only when it is in the vicinity of the top dead center of its trajectory, so that the movement of the hook is not modified by the presence of the lever 20 over most of its trajectory .
  • the funicular element 8 must no longer exert a force on the hook 9 when starting in its downward stroke.
  • the arch 6 must no longer exert such effort; this is why the spring 5 that appears at the figure 1 can be dimensioned only to absorb the forces due to the tension of the warp son, friction against the fixed parts of the loom and the inertia of the arches and smooth and no longer to pull the hook 9 down.
  • the drive parts of the mechanism can be dimensioned to withstand lower forces and the vibrations generated by this device compared to those of the prior art are lower.
  • the lever 20 can serve as an elastic abutment to the two hooks 9, which keeps the device a simplicity guaranteeing its economic performance.
  • the device represented in figure 6 is a variant of the invention in which the lever is replaced by a torsion spring 40 whose central portion surrounds an axis 41 fixed relative to the frame of the mechanism 7.
  • the operation is similar to that described for the device of Figures 1 to 4 and the spring 40 is able to exert on the hooks 9 a force directed downwards when they reach their top dead center positions.
  • This variant has, by its great simplicity of realization, the advantage of being particularly economical.
  • the selection device comprises a plurality of hooks arranged in a module, for example 8 times 2 hooks, these hooks being able to be selected by several blades arranged in a module side by side
  • the lever 20 or the spring 40 is common to all the hooks of a module and can cooperate with each of them.
  • the invention is also applicable to a shedding mechanism in which the retaining levers are not articulated but wherein the movable hooks are locked in position by fixed elements.
  • the elastic stop means are mounted on the movable hooks themselves.
  • the invention also relates to a loom comprising a selection device as previously described.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
  • Toys (AREA)
  • Automatic Assembly (AREA)
  • Electrically Operated Instructional Devices (AREA)
  • Push-Button Switches (AREA)

Abstract

In the selection of the moving hooks, in the shed harness of a Jacquard loom, a force (F3) is applied to the hook (9) at or near its top dead position to move it towards the bottom dead position. Also claimed is a hook selection mechanism, which has elastic butts (20,21) which give the force (F3) applied to the hook (9) at or near its top dead position to move it towards the bottom dead position. Preferably the force (F3) is equal to the friction forces (F1,F2) produced by the grip (15,24) on the needle (9) and the inertia forces. Two hooks (9) are displaced alternately by two griffes (10) in opposing phases. Elastic butts (20,21), acting on the hooks, have a lever which can be moved against spring pressure by the hook (9) on reaching its top dead position through the action of the hook on the lever shape. The lever (20) is a simple support, to turn on two axes (21) under spring pressure, which can be a torsion spring. The elastic butts (20,21) are part of the module forming the election system of a number of modules side by side with the hooks.

Description

L'invention a trait à un procédé et à un dispositif de sélection des crochets mobiles d'un mécanisme de formation de la foule d'un métier à tisser de type Jacquard et à un métier à tisser du type Jacquard comprenant un tel dispositif.The invention relates to a method and a device for selecting the movable hooks of a shedding mechanism of a Jacquard weaving loom and a Jacquard weaving loom comprising such a device.

Dans les métiers à tisser du type Jacquard, un mécanisme de formation de la foule soulève sélectivement des lisses comprenant un oeillet dans lequel passe un fil de chaîne, ce fil étant situé, en fonction de la position d'un crochet auquel est fixée l'extrémité supérieure de la lisse, au-dessus ou en dessous du fil de trame déplacé par le métier.In jacquard looms, a shedding mechanism selectively raises heddles comprising a grommet into which a warp thread passes, which thread is located, depending on the position of a hook to which the hoop is attached. upper end of the bar, above or below the weft yarn moved by the loom.

Il est connu, par exemple du brevet européen EP-0 214 075 , de déplacer un crochet d'un tel mécanisme de formation de la foule au moyen d'un couteau entre une position de point mort haut, à proximité de laquelle le crochet peut être immobilisé par un dispositif de sélection et correspondant à une position du fil de chaîne au-dessus du fil de trame, et une position de point mort bas correspondant à une position du fil de chaîne en dessous du fil de trame. On utilise en guise de dispositif de sélection un levier, mobile entre deux positions dans lesquelles, soit il bloque en position, soit il ne s'oppose pas au mouvement du crochet du mécanisme de formation de la foule. Ce levier est piloté, par exemple, par un électro-aimant.It is known, for example from European patent EP-0 214 075 moving a hook of such a shedding mechanism by means of a knife between a top dead position, near which the hook can be immobilized by a selection device and corresponding to a position of the wire of warp above the weft yarn, and a bottom dead position corresponding to a position of the warp yarn below the weft yarn. A lever is used as a selection device, movable between two positions in which it either blocks in position or does not oppose the movement of the hook of the shedding mechanism. This lever is driven, for example, by an electromagnet.

Dans ce genre de mécanisme, on peut procéder au nivelage des leviers de sélection, c'est-à-dire prévoir que, lors de chaque mouvement alternatif, un crochet situé au voisinage du point mort haut de sa trajectoire déplace l'extrémité inférieure du levier de sélection correspondant de telle sorte que l'extrémité supérieure du levier est pressée contre l'électro-aimant. Ceci induit une force qui s'oppose au mouvement du crochet mobile, au voisinage du point mort haut de sa trajectoire, cette force de rétention étant due aux frottements appliqués au crochet et à l'inertie des pièces en mouvement.In this kind of mechanism, it is possible to level the selection levers, that is to say that during each reciprocating movement, a hook located near the top dead center of its trajectory moves the lower end of the corresponding selection lever so that the upper end of the lever is pressed against the electromagnet. This induces a force that opposes the movement of the movable hook, near the top dead center of its trajectory, this retention force being due to the friction applied to the hook and the inertia of the moving parts.

Pour vaincre cette force, on doit contraindre le harnais formé des lisses du métier Jacquard de telle sorte qu'il puisse exercer sur les crochets un effort vertical dirigé vers le bas sensiblement égal à cette force de rétention. Cette contrainte supplémentaire sur le harnais s'ajoute à la contrainte normale du harnais qui est absorbée par la tension des fils de chaîne, les frottements des arcades contre les parties fixes du métier et l'inertie des arcades et des lisses.To overcome this force, it must constrain the harness formed smooth Jacquard loom so that it can exert on the hooks a vertical force directed downwards substantially equal to this retention force. This additional stress on the harness is added to the normal stress of the harness which is absorbed by the tension of the warp threads, the friction of the arches against the fixed parts of the craft and the inertia of the arches and smooth.

Les propriétés mécaniques du harnais doivent donc être prévues pour permettre l'application de cet effort vertical supplémentaire vers le bas, ce qui augmente son coût de fabrication, de même que celui des dispositifs mécaniques de rappel qu'il comprend et, plus généralement, des pièces mécaniques d'entraînement qui doivent être sur-dimensionnées. De plus, ceci accroît les phénomènes d'usure de l'ensemble de la mécanique Jacquard et du harnais. En outre, les efforts nécessaires pour vaincre les forces de frottement sont susceptibles de générer des vibrations dans le métier, ces vibrations pouvant avoir des conséquences négatives sur le fonctionnement et la durée de vie des organes mobiles du métier à tisser.The mechanical properties of the harness must therefore be provided to allow the application of this additional vertical force downwards, which increases its manufacturing cost, as well as the mechanical recall devices that it includes and, more generally, mechanical drive parts that must be over-sized. In addition, this increases the wear phenomena of all the Jacquard mechanics and the harness. In addition, the efforts required to overcome the frictional forces are likely to generate vibrations in the trade, these vibrations may have negative consequences on the operation and life of the moving parts of the loom.

Le but principal de l'invention est de résoudre ces problèmes et de fournir un procédé et un dispositif de sélection des crochets mobiles du métier à tisser permettant d'optimiser le dimensionnement du harnais et des pièces mécaniques d'entraînement ou de rappel élastique, tout en conservant l'efficacité d'un dispositif de sélection avec nivelage.The main object of the invention is to solve these problems and to provide a method and a device for selecting the mobile hooks of the loom for optimizing the sizing of the harness and the mechanical parts for driving or elastic return, while maintaining the efficiency of a selection device with leveling.

Dans cet esprit, l'invention concerne un procédé de sélection des crochets mobiles d'un mécanisme de formation de la foule d'un métier à tisser de type Jacquard comprenant au moins un crochet déplacé par un couteau entre une position de point mort haut, dans ou à proximité de laquelle le crochet peut être immobilisé par un dispositif de sélection, et une position de point mort bas. Un tel procédé et dispositif sont connu de DE-A-37 24 686 . Le procédé de l'invention est caractérisé en ce qu'il consiste à exercer individuellement sur ledit crochet, lors de chaque passage dudit crochet dans sa position de point mort haut ou à proximité de celle-ci, un effort tendant à ramener ledit crochet vers sa position de point mort bas, cet effort étant exercé sur ce crochet uniquement au voisinage de sa position de point mort haut.In this spirit, the invention relates to a method for selecting the movable hooks of a shedding mechanism of a jacquard loom comprising at least one hook moved by a knife between a top dead center position, in or near which the hook can be immobilized by a selection device, and a bottom dead position. Such a method and device are known to DE-A-37 24 686 . The method of the invention is characterized in that it consists in exerting individually on said hook, during each passage of said hook in its top dead center position or close thereto, a force tending to return said hook towards its position of low dead point, this force being exerted on this hook only in the vicinity of its position of top dead center.

Grâce à l'invention, les forces ainsi exercées compensent les forces de frottement et d'inertie et il n'est plus nécessaire que le harnais exerce sur les crochets mobiles une force suffisante pour vaincre celles-ci, ce qui permet de simplifier et d'alléger la construction du métier à tisser et du harnais.Thanks to the invention, the forces thus exerted compensate the friction and inertia forces and it is no longer necessary for the harness to exert sufficient force on the movable hooks to overcome these, which makes it possible to simplify and lighten the construction of the loom and the harness.

En pratique, on choisit l'effort exercé sur le crochet sensiblement égal à la résultante des forces de frottement exercées par son environnement sur le crochet et des forces d'inertie. Cet effort compense ainsi sensiblement les forces qui s'opposent au changement de direction du crochet au point mort haut de sa trajectoire.In practice, the force exerted on the hook is chosen to be substantially equal to the resultant of the friction forces exerted by its environment on the hook and the forces of inertia. This effort substantially offsets the forces that oppose the change of direction of the hook at the top dead center of its trajectory.

L'invention concerne aussi un dispositif permettant de mettre en oeuvre le procédé de l'invention et, plus spécifiquement, un dispositif de sélection des crochets mobiles d'un mécanisme de formation de la foule d'un métier à tisser de type Jacquard comprenant au moins un crochet déplacé par un couteau entre une position de point mort haut, dans ou à proximité de laquelle le crochet peut être immobilisé par un dispositif de sélection, et une position de point mort bas, caractérisé en ce qu'il comprend des moyens de butée élastique dudit crochet dans sa position de point mort haut, lesdits moyens étant aptes à exercer individuellement sur ledit crochet lors de chaque passage dudit crochet dans sa position de point mort haut ou à proximité de celle-ci et uniquement au voisinage de cette position, un effort tendant à ramener ledit crochet vers sa position de point mort bas.The invention also relates to a device for implementing the method of the invention and, more specifically, a device for selecting the movable hooks of a shedding mechanism of a Jacquard loom comprising at least one less a hook moved by a knife between a top dead center position, in or near which the hook can be immobilized by a selection device, and a bottom dead position, characterized in that it comprises means for elastic stop of said hook in its top dead center position, said means being able to exert individually on said hook during each passage of said hook in its top dead center position or close thereto and only in the vicinity of this position, a force tending to return said hook to its bottom dead center position.

Le dispositif de l'invention permet donc d'annuler sensiblement l'effet des forces de frottement et d'inertie appliquées au crochet lorsqu'il est dans sa position de point mort haut ou à proximité de celle-ci. En outre, l'effort exercé par la butée élastique permet de compenser l'inertie du crochet lui-même. En d'autres termes, l'invention permet d'appliquer directement sur le crochet mobile la force qui est nécessaire pour le mettre en mouvement vers le bas à partir du point mort haut de sa trajectoire.The device of the invention thus makes it possible to substantially cancel the effect of the friction and inertia forces applied to the hook when it is in its top dead center position or close thereto. In Moreover, the force exerted by the elastic stop compensates for the inertia of the hook itself. In other words, the invention makes it possible to apply directly to the movable hook the force which is necessary to put it in motion downwards from the top dead center of its trajectory.

Selon un premier aspect avantageux de l'invention, le dispositif comprend deux crochets déplacés alternativement par deux couteaux animés d'un mouvement alternatif en opposition de phase, les moyens de butée élastique étant aptes à coopérer avec lesdits deux crochets. Ainsi, un unique moyen de butée élastique peut servir pour deux crochets, ce qui permet de conserver au dispositif de l'invention un caractère simple.According to a first advantageous aspect of the invention, the device comprises two hooks displaced alternately by two knives animated with reciprocating movement in opposition of phase, the elastic stop means being able to cooperate with said two hooks. Thus, a single elastic stop means can be used for two hooks, which keeps the device of the invention a simple character.

Selon un autre aspect avantageux de l'invention, on peut prévoir que les moyens de butée élastique comprennent un levier apte à être déplacé, contre la force d'un ressort, par le crochet lorsque celui-ci atteint sa position de point mort haut. L'effort exercé sur le crochet dans sa position de point mort haut, ou à proximité de celle-ci, conformément à l'invention est, dans ce cas, dû à la force élastique du ressort.According to another advantageous aspect of the invention, provision may be made for the elastic stop means to comprise a lever able to be displaced against the force of a spring by the hook when it reaches its top dead center position. The force exerted on the hook in its top dead center position, or close to it, according to the invention is, in this case, due to the elastic force of the spring.

Suivant un premier mode de réalisation particulièrement avantageux de l'invention, lorsque le dispositif comprend deux crochets déplacés alternativement par deux couteaux, on peut prévoir que le levier est apte à être déplacé par les crochets lorsque ceux-ci atteignent leur position de point mort haut respective.According to a first particularly advantageous embodiment of the invention, when the device comprises two hooks moved alternately by two knives, it can be provided that the lever is adapted to be moved by the hooks when they reach their top dead center position. respectively.

Selon un autre mode de réalisation de l'invention, les moyens de butées élastiques peuvent comprendre un ressort de torsion. Ce ressort de torsion peut être en contact direct avec les crochets du mécanisme de formation de la foule, ce qui permet d'obtenir, avec un coût très faible, la fonction recherchée.According to another embodiment of the invention, the resilient stop means may comprise a torsion spring. This torsion spring can be in direct contact with the hooks of the shedding mechanism, which allows to obtain, with a very low cost, the desired function.

L'invention concerne enfin un métier à tisser du type Jacquard comprenant un dispositif de sélection tel que précédemment décrit.The invention finally relates to a Jacquard loom comprising a selection device as previously described.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre de deux modes de réalisation d'un dispositif de sélection des lisses d'un métier à tisser de type Jacquard conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • La figure 1 est une vue schématique de principe illustrant un métier à tisser de type Jacquard incorporant l'invention et destiné à la commande de deux lisses ;
  • La figure 2 est une vue à plus grande échelle du dispositif de formation de la foule utilisé avec le métier à tisser de la figure 1 ;
  • La figure 3 est une vue de détail à plus grande échelle du dispositif de sélection des lisses appartenant au mécanisme de formation de la foule de la figure 2 dans une première position de travail ;
  • La figure 4 est une vue analogue à la figure 3 alors que le dispositif est dans une seconde position de travail ;
  • la figure 5 est un schéma à plus grande échelle de la répartition des forces agissant sur le crochet dans la position de la figure 4 et
  • La figure 6 est une vue analogue à la figure 4 pour un dispositif de sélection conforme à un second mode de réalisation de l'invention.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of two embodiments of a smooth selection device of a Jacquard type loom according to in principle, given purely by way of example and with reference to the appended drawings in which:
  • The figure 1 is a schematic view of principle illustrating a loom Jacquard type incorporating the invention and intended for the control of two smooth;
  • The figure 2 is a larger-scale view of the crowd-forming device used with the loom of the figure 1 ;
  • The figure 3 is a larger scale detail view of the slat selection device belonging to the crowd formation mechanism of the figure 2 in a first work position;
  • The figure 4 is a view similar to the figure 3 while the device is in a second working position;
  • the figure 5 is a larger scale diagram of the distribution of forces acting on the hook in the position of the figure 4 and
  • The figure 6 is a view similar to the figure 4 for a selection device according to a second embodiment of the invention.

Dans le métier à tisser représenté à la figure 1, une nappe de chaîne 1 provient d'une ensouple 2. Chaque fil de chaîne passe dans l'oeillet 3a d'une lisse 3 destinée à ouvrir le pas pour permettre le passage d'une duite en vue de constituer le tissu qui s'enroule sur une bobine 4. Dans l'exemple représenté, on suppose qu'il n'existe que deux lisses 3 ou que deux groupes de lisses, les unes en étant en position haute et les autres en position basse. C'est ainsi que l'on a référencé 3' les lisses en position basse et 3 celles en position haute. L'extrémité inférieure de chaque lisse est reliée au bâti du métier à tisser par un ressort de traction 5, tandis que son extrémité supérieure est solidaire d'une arcade 6. Les arcades sont élevées et abaissées au moyen d'un mécanisme de formation de la foule référencé 7.In the loom shown in figure 1 , a warp 1 comes from a beam 2. Each warp passes through the eyelet 3 has a smooth 3 to open the pitch to allow the passage of a pick to form the fabric that s 4. In the example shown, it is assumed that there are only two smooth 3 or two groups of smooth, one being in the upper position and the other in the low position. Thus, we referenced 3 'the smooth in the low position and 3 those in the high position. The lower end of each loom is connected to the frame of the loom by a tension spring 5, while its upper end is secured to an arcade 6. The arches are raised and lowered by means of a mechanism for forming the loom. the referenced crowd 7.

Comme il apparaît plus clairement à la figure 2, le mécanisme de formation de la foule comprend un organe funiculaire 8 à chacune des extrémités duquel est associé un crochet 9. Les crochets comprennent un bec latéral 9a susceptible de coopérer avec des couteaux 10 animés de mouvements alternatifs verticaux en opposition de phase. L'élément funiculaire 8 passe autour d'une première poulie 11 d'un palonnier 12 dont la seconde poulie 13 est entourée par l'une des arcades 6. L'extrémité de celle-ci opposée à celle qui est reliée à la lisse 3 est ancrée à un point fixe 14 du bâti de la machine. La partie supérieure du mécanisme 7 est pourvue de crochets de retenue réalisés sous la forme de leviers 15 et appartenant à un dispositif de sélection. Les leviers 15 sont associés à un électro-aimant unique 16, de telle sorte que, lorsque l'électro-aimant est excité, les leviers sont déplacés vers le centre ou maintenus plaqués contre l'électro-aimant 16 après avoir été déplacés par un crochet 9. Les extrémités recourbées des branches inférieures 15a des leviers 15 coopérent avec les extrémités recourbées supérieures 9b des crochets 9 afin de les immobiliser dans leur position de point mort haut ou à proximité de celle-ci, dans la situation où est représenté le crochet de la partie gauche de la figure 2 alors que le crochet de la partie droite est représenté dans la position de point mort bas.As it appears more clearly in figure 2 , the shedding mechanism comprises a funicular member 8 at each end of which is associated a hook 9. The hooks comprise a lateral nose 9a capable of cooperating with knives 10 animated vertical reciprocating movements in phase opposition. The funicular element 8 passes around a first pulley 11 of a rudder 12 whose second pulley 13 is surrounded by one of the arches 6. The end thereof opposite to that which is connected to the stringer 3 is anchored to a fixed point 14 of the frame of the machine. The upper part of the mechanism 7 is provided with retaining hooks in the form of levers 15 and belonging to a selection device. The levers 15 are associated with a single electromagnet 16, so that when the electromagnet is energized, the levers are moved toward the center or held pressed against the electromagnet 16 after being moved by a hook 9. The curved ends of the lower branches 15 has levers 15 cooperating with the upper curved ends 9b of the hooks 9 in order to immobilize them in their top dead center position or close to it, in the situation where is represented the hook of the left part of the figure 2 while the hook of the right part is shown in the bottom dead center position.

Comme il apparaît plus clairement à la figure 3, chaque levier 15 est articulé autour d'un pivot 18 et comprend une branche inférieure 15a destinée à coopérer avec le bec supérieur 9b d'un crochet 9 et une branche supérieure 15b destinée à être déplacée ou retenue en position grâce à la force électro-magnétique générée par l'électro-aimant 16. La branche supérieure 15b de chaque levier 15 est maintenue écartée de l'électro-aimant 16 par un ressort 19 qui est comprimé lorsque le bec supérieur 9b du crochet 9 déplace l'extrémité inférieure de la branche 15a du levier 15 lors de l'arrivée du crochet 9 dans sa position de point mort haut.As it appears more clearly in figure 3 Each lever 15 is articulated about a pivot 18 and includes a lower arm 15 is intended to cooperate with the upper beak 9 b with a hook 9 and an upper leg 15 b to be moved or held in position by the electromagnetic force generated by the electromagnet 16. The upper branch 15b of each lever 15 is kept away from the electromagnet 16 by a spring 19 which is compressed when the upper nozzle 9b of the hook 9 moves the lower end of the leg 15 a of the lever 15 upon arrival of the hook 9 in its dead center position .

Dans la position de la figure 3, le crochet 9 est immobilisé en position car il ne peut pas redescendre sous l'effet de la traction exercée sur lui par l'élément funiculaire 8 du fait du blocage réalisé par le levier 15 sous l'effet du ressort 19. Lors de chaque arrivée du couteau 10 au point mort haut de sa trajectoire, le crochet 9 est légèrement soulevé, de telle sorte que son bec supérieur 9b échappe à la branche 15a du levier 15. Si l'électro-aimant 16 est activé à cet instant, la branche 15a est maintenue écartée du bec 9b et ne s'oppose pas au mouvement du bec 9 vers le bas en appui sur le couteau 10. Au contraire, si l'électro-aimant 16 n'est pas activé, le ressort 19 repousse le levier 15 vers sa position d'engagement avec le bec 9b.In the position of the figure 3 the hook 9 is immobilized in position because it can not come back down under the effect of the traction exerted on it by the funicular element 8 because of the blocking made by the lever 15 under the effect of the spring 19. During each arrival of the cutter 10 at top dead center of its trajectory, the hook 9 is slightly lifted so that its upper beak 9 b escapes the leg 15 a of the lever 15. If the electromagnet 16 is activated at this time the leg 15 a is held away from the spout 9 and b is not opposed to the spout 9 of the movement downwards bearing on the knife 10. on the contrary, if the electromagnet 16 is not activated, the spring 19 pushes the lever 15 towards its engagement position with the spout 9 b .

Ainsi, le crochet 9 demeure immobilisé tant que l'électro-aimant 16 n'est pas activé.Thus, the hook 9 remains stationary as the electromagnet 16 is not activated.

Comme il apparaît plus clairement à la figure 4, la position de point mort haut du crochet 9 est située au-dessus de la position haute de la figure 4. En effet, le couteau 10 repousse le crochet 9 vers le haut afin de libérer le crochet 9b par rapport à l'extrémité de la branche 15a du levier 15. Dans sa position représentée à la figure 3, le crochet 9 est en contact avec une butée 20 formée par un levier courbe muni de deux extensions 20a et 20b aptes à être en appui contre les crochets 9 lorsqu'ils sont dans leur position de point mort haut ou à proximité de celle-ci. La butée ou levier 20 repose sur deux axes 21 et 22 fixes par rapport au boîtier du mécanisme de formation de la foule 7. Le levier 20 est appuyé sur les axes 21 et 22 par un ressort 23 disposé au-dessus du levier 20, c'est-à-dire du côté de celui-ci opposé aux axes 21 et 22. Le mouvement du couteau 10 déplace le levier 20 vers la position représentée à la figure 4 contre la force du ressort 23. Ainsi, le levier 20 constitue une butée élastique pour le mouvement du crochet 9.As it appears more clearly in figure 4 , the top dead center position of the hook 9 is located above the upper position of the figure 4 . Indeed, the cutter 10 pushes the hook 9 upwards to release the hook 9 b with respect to the end of the leg 15 a of the lever 15. In its position shown in figure 3 The hook 9 is in contact with a stop 20 formed by a cam lever has two extensions 20 a and 20 b adapted to bear against the hooks 9 when they are in their top dead point position or close to it -this. The abutment or lever 20 rests on two axes 21 and 22 fixed relative to the housing of the shedding mechanism 7. The lever 20 is supported on the pins 21 and 22 by a spring 23 disposed above the lever 20, c that is to say on the opposite side to the axes 21 and 22. The movement of the knife 10 moves the lever 20 towards the position shown in FIG. figure 4 against the force of the spring 23. Thus, the lever 20 constitutes an elastic abutment for the movement of the hook 9.

Dans sa position de la figure 4, et comme illustré en figure 5, le crochet 9 subit une force horizontale F0 de la part de la branche inférieure 15a du levier 15, cette force étant due, entre autres, à l'effort généré par le ressort 19. Lorsqu'il entame son mouvement de descente en appui sur le couteau 10, le crochet 9 est soumis à une force de frottement F1 de la branche 15a sur lui-même et à une force de frottement F2, également dirigée vers le haut, due à son frottement sur un rail de guidage 24 appartenant à la structure du mécanisme 7.In his position of figure 4 , and as illustrated in figure 5 The hook 9 is subjected to a horizontal force F 0 from the lower branch 15a of the lever 15, which force is due, among other things, the force generated by the spring 19. When it begins its downward movement in pressing the cutter 10, the hook 9 is subjected to a frictional force F 1 of the arm 15 has on itself and a frictional force F 2, also pointing upwards, due to its friction on a rail guide 24 belonging to the structure of the mechanism 7.

Les forces F1 et F2 sont sensiblement proportionnelles à la force F0. De plus, une force d'inertie proportionnelle à la masse du crochet 9 s'oppose à son mouvement vers le bas. D'autre part, grâce à l'invention, le crochet 9 subit une force F3 exercée par l'extrémité 20a du levier 20 du fait de la compression du ressort 23. Compte tenu de l'emplacement du levier 20, la force F3 n'est exercée sur le crochet 9 que lorsqu'il est au voisinage du point mort haut de sa trajectoire, de sorte que le mouvement du crochet n'est pas modifié par la présence du levier 20 sur l'essentiel de sa trajectoire.The forces F 1 and F 2 are substantially proportional to the force F 0 . In addition, an inertial force proportional to the mass of the hook 9 opposes its downward movement. On the other hand, thanks to the invention, the hook 9 is subjected to a force F 3 exerted by the end 20 a of the lever 20 due to the compression of the spring 23. Given the location of the lever 20, the force F 3 is exerted on the hook 9 only when it is in the vicinity of the top dead center of its trajectory, so that the movement of the hook is not modified by the presence of the lever 20 over most of its trajectory .

Par un choix judicieux de la constante de raideur du ressort 23 à la portée de l'homme du métier, on peut réaliser un dispositif dans lequel l'effort F3 est sensiblement égal à la résultante des forces de frottement F1 et F2 et des forces d'inertie, ce qui permet d'annuler cette résultante.By a judicious choice of the stiffness constant of the spring 23 within the reach of those skilled in the art, it is possible to produce a device in which the force F 3 is substantially equal to the resultant of the friction forces F 1 and F 2 and forces of inertia, which makes it possible to cancel this resultant.

Ainsi, l'élément funiculaire 8 ne doit plus exercer un effort sur le crochet 9 lors de son démarrage dans sa course vers le bas. En d'autres termes, l'arcade 6 ne doit plus exercer un tel effort ; c'est pourquoi le ressort 5 qui apparaît à la figure 1 peut être dimensionné uniquement pour absorber les forces dues à la tension des fils de chaîne, aux frottements contre les parties fixes du métier et à l'inertie des arcades et des lisses et non plus pour tirer le crochet 9 vers le bas. Les pièces d'entraînement du mécanisme peuvent être dimensionnées pour résister à des efforts moindres et les vibrations générées par ce dispositif par rapport à ceux de l'art antérieur sont inférieures.Thus, the funicular element 8 must no longer exert a force on the hook 9 when starting in its downward stroke. In other words, the arch 6 must no longer exert such effort; this is why the spring 5 that appears at the figure 1 can be dimensioned only to absorb the forces due to the tension of the warp son, friction against the fixed parts of the loom and the inertia of the arches and smooth and no longer to pull the hook 9 down. The drive parts of the mechanism can be dimensioned to withstand lower forces and the vibrations generated by this device compared to those of the prior art are lower.

Selon un aspect avantageux de l'invention, le levier 20 peut servir de butée élastique aux deux crochets 9, ce qui permet de conserver au dispositif une simplicité garantissant ses performances économiques.According to an advantageous aspect of the invention, the lever 20 can serve as an elastic abutment to the two hooks 9, which keeps the device a simplicity guaranteeing its economic performance.

On note, à la figure 4, que le levier 20 est déplacé par le crochet 9 et pivote autour de l'axe 22. De la même manière, lorsque le levier est déplacé par le crochet situé sur la droite de la figure 2, il pivote autour de l'axe 21.We note, at the figure 4 , that the lever 20 is moved by the hook 9 and pivots around the axis 22. In the same way, when the lever is moved by the hook located on the right of the figure 2 it pivots around the axis 21.

Le dispositif représenté à la figure 6 est une variante de l'invention dans laquelle le levier est remplacé par un ressort de torsion 40 dont la partie centrale entoure un axe 41 fixe par rapport au bâti du mécanisme 7. Le fonctionnement est similaire à celui qui a été décrit pour le dispositif des figures 1 à 4 et le ressort 40 est apte à exercer sur les crochets 9 un effort dirigé vers le bas lorsque ceux-ci atteignent leurs positions de point mort haut. Cette variante présente, de par sa grande simplicité de réalisation, l'avantage d'être particulièrement économique.The device represented in figure 6 is a variant of the invention in which the lever is replaced by a torsion spring 40 whose central portion surrounds an axis 41 fixed relative to the frame of the mechanism 7. The operation is similar to that described for the device of Figures 1 to 4 and the spring 40 is able to exert on the hooks 9 a force directed downwards when they reach their top dead center positions. This variant has, by its great simplicity of realization, the advantage of being particularly economical.

Selon un aspect de l'invention qui peut être mis en oeuvre avec les deux modes de réalisation décrits, lorsque le dispositif de sélection comprend une pluralité de crochets disposés en module, par exemple de 8 fois 2 crochets, ces crochets étant aptes à être sélectionnés par plusieurs lames disposées en module côte à côte, on peut prévoir que le levier 20 ou le ressort 40 est commun à tous les crochets d'un module et peut coopérer avec chacun d'entre eux.According to one aspect of the invention that can be implemented with the two embodiments described, when the selection device comprises a plurality of hooks arranged in a module, for example 8 times 2 hooks, these hooks being able to be selected by several blades arranged in a module side by side, it can be provided that the lever 20 or the spring 40 is common to all the hooks of a module and can cooperate with each of them.

On conçoit que l'invention est aussi applicable à un mécanisme de formation de la foule dans lequel les leviers de retenue ne sont pas articulés mais dans lequel les crochets mobiles sont bloqués en position par des éléments fixes.It is conceivable that the invention is also applicable to a shedding mechanism in which the retaining levers are not articulated but wherein the movable hooks are locked in position by fixed elements.

Selon une variante non représentée de l'invention, il est aussi possible de prévoir que les moyens de butée élastique sont montés sur les crochets mobiles eux-mêmes.According to a not shown variant of the invention, it is also possible to provide that the elastic stop means are mounted on the movable hooks themselves.

L'invention concerne aussi un métier à tisser comprenant un dispositif de sélection tel que précédemment décrit.The invention also relates to a loom comprising a selection device as previously described.

Claims (9)

  1. A method for the selection of the mobile hooks of a shedding mechanism (7) of a jacquard loom, comprising at least one hook (9) moved by a blade (10) between a upper dead point position, in or close to which said hook can be immobilised by a selection device (15, 16), and a lower dead point position, characterized in that it consists in exerting a stress (F3) individually on said hook, on each passage of said hook in its upper dead point position or close thereto, tending to bring said hook back towards its lower dead point position, said stress being exerted on said hook solely in the vicinity of its upper dead point position.
  2. The selection method according to Claim 1, characterised in that said stress (F3) is substantially equal to the resultant of the forces of friction (F1, F2) exerted by its environment (15, 24) on said hook (9) and forces of inertia.
  3. A device for the selection of the mobile hooks of a shedding mechanism (7) of a jacquard loom comprising at least one hook (9) moved by a blade (10) between an upper dead point position, in or close to which said hook can be immobilised by a selection device (15, 16), and a lower dead point position, characterised in that it comprises elastic stop means (20-23, 40, 41) for said hook in its upper dead point position, said means being suited to exert individually on said hook, on each passage of said hook in its upper dead point position or close thereto and solely in the vicinity of this position, a stress (F3) tending to push said hook towards its lower dead point position.
  4. The selection device according to Claim 3, characterised in that it comprises two hooks (9) moved alternately by two blades (10) actuated in alternate movements in phase opposition, said elastic stop means (20-23, 40, 41) being suited to cooperate with said two hooks.
  5. The selection device according to Claim 3, characterised in that said elastic stop means (20-23) comprise a lever (20) suited to be displaced, against the force of a spring (23), by said hook (9) when the latter reaches its upper dead point position.
  6. The selection device according to Claims 4 and 5, characterised in that said lever (20) is provided with two extensions (20a, 20b) suited to rest against said two hooks (9) when the latter reach their upper dead point position.
  7. The selection device according to Claims 5 or 6, characterised in that said lever (20) rests simply, under the effect of the force of said spring (23) on two axes (21, 22) about which it is suited to pivot, said lever being suited to pivot about an axis situated opposite a hook (9) which displaces it.
  8. The selection device according to Claim 3, characterised in that said elastic stop means comprise a torsion spring (40).
  9. A jacquard loom comprising a selection device according to any of Claims 3 to 8.
EP97420133A 1996-08-06 1997-07-28 Method and device for the selection of the mobile hooks of a shedding mechanism and jacquard loom Expired - Lifetime EP0823501B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9610083A FR2752246B1 (en) 1996-08-06 1996-08-06 METHOD AND DEVICE FOR SELECTING THE MOVABLE HOOKS OF A CROWD TRAINING MECHANISM AND JACQUARD TYPE Loom
FR9610083 1996-08-06

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EP0823501A1 EP0823501A1 (en) 1998-02-11
EP0823501B1 EP0823501B1 (en) 2001-11-07
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US (1) US5839481A (en)
EP (1) EP0823501B2 (en)
JP (1) JP3575960B2 (en)
KR (1) KR100403262B1 (en)
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AT (1) ATE208442T1 (en)
DE (1) DE69707995T3 (en)
ES (1) ES2163727T5 (en)
FR (1) FR2752246B1 (en)
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US6216749B1 (en) * 1999-12-10 2001-04-17 Wis Seaming Equipment, Inc. Weaving device
US6216748B1 (en) * 1999-12-10 2001-04-17 Wis Seaming Equipment, Inc. Pivoting magnet latches for improved weaving device
US6318415B1 (en) * 1999-12-10 2001-11-20 Wis Seaming Equipment Inc. Quick release coupling/pulley assembly for improved weaving device
BE1013353A5 (en) 2000-03-17 2001-12-04 Wiele Michel Van De Nv HOOK SELECTION DEVICE FOR A GAAPING DEVICE FOR A WEAVING MACHINE.
BE1013880A3 (en) * 2000-12-21 2002-11-05 Wiele Michel Van De Nv TRIDENT-jacquard.
CN2476569Y (en) * 2001-04-02 2002-02-13 张海林 Shedding control device of jacquard
FR2846343B1 (en) 2002-10-25 2004-12-17 Staubli Lyon CROWD FORMATION MECHANISM AND WEAVING MACHINE EQUIPPED WITH SUCH A MECHANISM
JP4192713B2 (en) * 2003-07-25 2008-12-10 富士ゼロックス株式会社 Arylamine compound, charge transport material, electrophotographic photosensitive member, image forming apparatus, and process cartridge
FR2900666B1 (en) * 2006-05-03 2008-06-20 Staubli Lyon Soc Par Actions S CROWN FORMING MECHANISM, WEAVING EQUIPPED WITH SUCH A MECHANISM AND METHOD OF SELECTING MOBILE HOOKS OF SUCH A MECHANISM
CN102002788B (en) * 2010-12-14 2013-12-25 上海超诚电子科技有限公司 Shedding device, shedding device assembly and jacquard
BE1019710A3 (en) * 2010-12-21 2012-10-02 Wiele Michel Van De Nv GAAP FORMAT FOR A WEAVING MACHINE.
CN102719965B (en) * 2012-06-09 2014-09-17 浙江引力纺织机械有限公司 Anti-fatigue self-reset vertical hook and jacquard lifting component with same
CN202786615U (en) * 2012-07-13 2013-03-13 太平洋机电(集团)有限公司 Wire harnessing device suitable for flat fibre weaving
BE1021506B1 (en) * 2012-11-19 2015-12-03 Nv Michel Van De Wiele MODULE SUITABLE FOR BUILD-IN IN A JAQUARD MACHINE
BE1021951B1 (en) * 2014-07-18 2016-01-28 Michel Van De Wiele Nv GAAP FORMAT FOR A WEAVING MACHINE
FR3118070B1 (en) 2020-12-21 2022-12-23 Staubli Lyon SHEDDING MECHANISM AND JACQUARD TYPE Loom
FR3118069B1 (en) 2020-12-21 2024-01-12 Staubli Lyon CROWD FORMING MECHANISM AND JACQUARD TYPE WEAVING Loom
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PT823501E (en) 2002-04-29
FR2752246B1 (en) 1998-10-09
JPH1096134A (en) 1998-04-14
EP0823501A1 (en) 1998-02-11
CN1084809C (en) 2002-05-15
EP0823501B1 (en) 2001-11-07
TW380176B (en) 2000-01-21
DE69707995T3 (en) 2008-09-11
DE69707995T2 (en) 2002-04-04
ES2163727T5 (en) 2008-06-16
ATE208442T1 (en) 2001-11-15
CN1176322A (en) 1998-03-18
US5839481A (en) 1998-11-24
KR19980018399A (en) 1998-06-05
DE69707995D1 (en) 2001-12-13
ES2163727T3 (en) 2002-02-01
JP3575960B2 (en) 2004-10-13
FR2752246A1 (en) 1998-02-13
KR100403262B1 (en) 2004-02-11

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