EP1413657A1 - Shedding mechanism and loom with such a mechanism - Google Patents

Shedding mechanism and loom with such a mechanism Download PDF

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Publication number
EP1413657A1
EP1413657A1 EP03356165A EP03356165A EP1413657A1 EP 1413657 A1 EP1413657 A1 EP 1413657A1 EP 03356165 A EP03356165 A EP 03356165A EP 03356165 A EP03356165 A EP 03356165A EP 1413657 A1 EP1413657 A1 EP 1413657A1
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EP
European Patent Office
Prior art keywords
lever
mechanism according
blade
housing
hook
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03356165A
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German (de)
French (fr)
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EP1413657B1 (en
Inventor
Dario Bassi
Damien Bouchet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Staeubli Lyon SA
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Staeubli Lyon SA
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Publication date
Application filed by Staeubli Lyon SA filed Critical Staeubli Lyon SA
Publication of EP1413657A1 publication Critical patent/EP1413657A1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/06—Double-lift jacquards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/20—Electrically-operated jacquards
    • 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 crowd forming mechanism and to a loom equipped with such a mechanism.
  • a shedding mechanism selectively lifts heddles each comprising an eyelet through which a warp thread passes, this thread being located, depending on the position of a hook to which the 'upper end of the heddle, above or below a weft thread moved by the loom.
  • a known mechanism for example from EP-A-0 219 437 comprises, among other things, movable hooks each provided with a lateral spout capable of cooperating with knives driven by alternating vertical movements in phase opposition.
  • Each movable hook is provided with a curved end intended to allow its immobilization by cooperation of shapes with a retaining lever.
  • Each movable hook is also provided with a one-piece elastic tongue with the hook and intended to control the movement of the retaining lever.
  • a tongue is subjected to relatively intense repeated forces, capable of inducing its permanent deformation by creep, or even its rupture. In this case, the crowd obtained has "faults".
  • the invention more particularly intends to remedy by proposing a crowd formation mechanism whose movable hooks are robust and precisely dimensioned, which ensures reliable operation of the loom, while they are compact in height, that is to say parallel to their direction of movement. This makes it possible to create a compact mechanism, hence saving space and better economic performance.
  • the invention relates to a crowd formation mechanism on a Jacquard type loom, this mechanism comprising movable hooks each moved by a knife, between a top dead center position, in or near which each hook can be immobilized by a selection device, and a bottom dead center position, each movable hook comprising a body provided with a spout , intended to bear on the aforementioned knife.
  • This mechanism is characterized in that each hook further comprises a metal blade intended to interact with the selection device and fixed to the aforementioned body, with the possibility of relative movement relative to the body, in an area of this body opposite to the selection device with respect to the area of the body from which the beak extends.
  • the bipartite nature of the mobile hooks makes it possible to benefit from the robustness of the body for the mechanical connection between the hook and the knife, while the geometry of the metal blade is defined with great precision, which induces a high reliability of the interactions between the movable hook and the selection device.
  • the metal blade is fixed to the body in the lower part when the hook is in the operating configuration of the mechanism, the flexibility of the blade, over substantially its entire height, can be used for the transverse movement of its part more particularly intended to come in engagement with a corresponding part of the selection system.
  • the fact that a relative movement is possible between the blade and the body of the hook can come from the flexibility of the blade and / or that of the body.
  • the electromagnet of the selection device can be molded into one of the sides of a receiving and guiding housing in translation of the movable hook.
  • This overmolding induces precise positioning of the electromagnet relative to the other functional parts of the device, such as the axes of the retaining levers, the stops and the supports of these levers as well as the guide grooves of the movable hooks. Due to this high precision, the amplitudes of the movements of the moving parts can be reduced, in particular as regards the oscillation of the retaining levers and the bending of the blade of the movable hooks. This also contributes to the compactness of the mechanism.
  • the invention also relates to a weaving loom equipped with a shedding mechanism as previously described.
  • a ply of warp threads 1 comes from a beam 2.
  • Each warp thread 1 passes through the eyelet 3 has a heddle 3 intended to open the pitch to allow the passage of a pick in order to constitute the fabric which is wound on a reel 4.
  • the lower end of each heddle is connected to the frame of the loom by a tension spring 5, while its upper end is secured to an arch 6.
  • a shedding mechanism 7 associated with an electronic control unit 8 allows the arches 6 to be raised more or less against a return force exerted by the springs 5.
  • each arch has one end 6 a secured to a housing 10 of the mechanism 7, this arch passing through a block 11 suspended from a cord 12, the two ends of which are respectively secured to two movable hooks 13 intended to be selectively raised by knives 14 animated by a movement of vertical oscillations in phase opposition, as shown by the arrows F 2 .
  • each hook 13 is formed by a plastic body 20 in the lower end 201 from which an end 12 a of the cord 12 is molded.
  • the body 20 forms a single spout 202 that extends laterally with respect to a main longitudinal axis XX 'of the body 20.
  • This nozzle 202 is intended to bear against the upper surface 14 has a knife 14.
  • the hook 13 can thus be regularly lifted by a single knife 14.
  • the body 20 Given its constituent material, the body 20 has a certain flexibility allowing it to adapt to a possible defect in position or parallelism of the respective trajectories of this body and of the associated knife 14. This possibility of elastic deformation of the body 20 is represented by the double arrow F 20 in FIG. 2. In practice, the flexibility of the body 20 allows self-positioning of the spout 202 on the knife 14.
  • the hook 13 also includes a metal blade 21 partially overmolded in the body 20.
  • the blade 21 comprises a part 211 overmolded in an area 203 of the body 20, located near its lower end 201, that is to say say below the part 204 of the body 20 from which the spout 202 extends laterally.
  • the part 211 is open downwards, which allows the passage of the end 12 a of the cord 12 which can therefore be molded into the body 20 over a relatively large length L 12 .
  • the blade 21 extends over a length L 21 above its part 211, this length being relatively large compared to the total length L '21 of the blade 21
  • the blade 21 comprises two lateral uprights 212 and 212 'defining between them a window 213 in which the major part of the body 20 is housed.
  • the uprights 212 and 212 ' extend beyond the window 213 to a curved end 214.
  • the uprights 212 and 212' are connected by a crosspiece 215 which separates the window 213 from an opening 216 formed between the parts 212, 212 ', 214 and 215 of the blade 21.
  • the elements 20 and 21 are integral in the lower part of the hook 13, while the part of the blade 21 which extends over the length L 21 above the area 203 of the body 20 , is susceptible to lateral deflections, as represented by the double arrow F 3 in FIG. 3. These lateral deflections F 3 correspond, in fact, to a relative deflection of the blade 21 relative to the body 20.
  • the mechanism 7 also includes an electromagnet 15 overmolded in a part of the housing 10. This overmolding ensures precise positioning of the electromagnet 15 relative to the housing 10 and to the elements that it supports or guides.
  • the housing 10 comprises two fixed axes 10 a on which are pivotally mounted two retaining levers 16 intended to cooperate respectively with the two movable hooks 13 connected to the two ends of the same cord 12.
  • Each lever 16 comprises a metal frame 30 provided with a cylindrical bore with a circular section 301 adapted to the outside diameter of an axis 10 a , so that the frame 30 can be mounted around an axis 10 a with the possibility of swiveling, as shown by the double arrows F 4 in FIG. 2.
  • the bore 301 of each frame 30 is formed in one end 302 of this frame.
  • the frame 30 is molded into a body 31 made of a non-magnetic material, such as a synthetic material and, more specifically, a plastic material.
  • the body 31 forms a spout 311 for retaining a movable hook 13 near its top dead center position.
  • the body 31 is also provided with a heel 312 for centering with respect to a spring 32 exerting on the body 31 a force F 5 tending to pivot the lever 16 towards the outside of the housing 6. This force tends to cause the spout 311 in the opening 216 of the blade 21 of a neighboring movable hook, which makes it possible to retain such a movable hook in the high position.
  • the metal frame 30 of a lever 16 makes it possible to control its pivoting thanks to the electromagnet 15, a lever 16 which can be moved by the curved end 214 of a blade 21, and, optionally, held in position at against the force F 5 , when the electromagnet 15 is excited.
  • the body 31 allows an efficient interaction without metal / metal contact of a retaining lever 16 with a movable hook 13.
  • the levers 16 are each provided with a deflector 161 projecting relative to their main part 16 a in the direction of the central axis X 10 -X '10 of the housing 10, between its articulation axis 10 a and a zone Z 1 in which the armature 30 can come to bear against the electromagnet 15.
  • a second deflector 162 is provided between the zone Z 1 and the adjacent hook 13.
  • the deflectors 161 and 162 are movable with the lever 16, inside grooves 101 and 102 formed in the body 10, which allows them to isolate the zone Z 1 which thus forms a protected closed chamber against pollution, in particular the flock capable of being transported by a hook 13.
  • each groove 10b of the housing 10 is delimited by two ribs 10f and 10f 'between which it extends, which allows effective guidance of the upright 212 or 212' which it receives .
  • Each rib has this shape from the bottom of the housing 10 to approximately the location of the upper curved portion of the spout 202 on the right of FIG.
  • the rib 10 f ′ which forms the outer edge of the groove 10 b may not be removed over the height H but deviate from the rib 10 f to leave the blade 21 a sufficient clearance.
  • the widening or opening of the groove 10 b towards the outside near the elements 15 and 16 aims to allow the bending of the blade 21 in this area .
  • a stop 40 loaded elastically by a spring 41 is mounted, between the sliding paths of two movable hooks 13, bearing on tabs 10 c of the housing 10.
  • This elastic stop 40 is intended to cooperate with a heel 205 formed near the end 201 of each body 20. Given the respective positioning of the elements 205 and 40, this interaction takes place when each movable hook 13 arrives in the vicinity of its position from top dead center.
  • This arrangement makes it possible to overcome most of the inertial and friction forces of the movable hooks, which facilitates the reversal of movement and makes it possible to optimize the dimensioning of the harness and of the mechanical drive parts, such as the knives 14 , or elastic return, such as springs 5.
  • the curved end 214 of the blade 21 is also dimensioned so that it can come to bear and exert a force F 6 against a ramp 313 formed by the body 31 of each lever 16.
  • This momentary support of a hook 13 on a lever 16 allows leveling of the lever 16, that is to say its setting on the electromagnet 15, with elastic preload due to the bending of the blade 21 which performs the function of the elastic tongue described in EP-A-0 219 437.
  • the blade 21 therefore provides a leveling function.
  • knives 14 make it possible to selectively move movable hooks 13 each comprising a body 20 of synthetic material and an elastic metal blade 21 which extends, essentially, above the zone where it is fixed to this body.
  • Retaining levers 16 are associated with an electromagnet 15.
  • each lever 16 is pivotally mounted on the axle 10 has corresponding, as represented by double-F 4 and comprises a frame 30 which extends on either side of the axis 10 a on which it is mounted. More specifically, each frame 30 comprises a first branch 304 which extends upwards from a central part 305 in which is formed a circular bore 301 for receiving the axis 10 a .
  • the branch 304 is intended to interact with the electromagnet 15 as a function of its activation.
  • the frame 30 also comprises a branch 306 which extends opposite the branch 304 relative to the part 305.
  • This branch 306 is molded into a body 31 of plastic material which forms a spout 311 intended to interact with an opening 216 of the blade 21 of a hook 13.
  • the body 31 also forms a ramp 313 for leveling the position of the lever 16 used during an interaction with the curved upper end 214 of a blade 21.
  • the blade 21 then exerts on the lever 16 a force F 6 for moving the armature 30 towards the electromagnet 15.
  • the partitions 10 d of the housing 10 are provided with seals 10 e disposed near the cylindrical external surface with circular base 305 a of the part 305.
  • the partitions 10 d can be provided with reduced clearance with respect to the surface 305 a , the seals 10 e can then be removed because the ends of the partitions 10 d then constitute dust-proofing means.
  • hooks 13 each comprise a body 20 of plastic material as well as a metal blade 21, these elements being molded into each other in the lower part of the body 20.
  • a relative movement of movement F 3 is possible between the body 20 and the blade 21 of each hook.
  • the blade 21 of each hook can be retained in position by a spout 311 formed by a body 31 of a retaining lever 16 mounted pivoting about an axis 10 a formed by a housing 10.
  • Each lever 16 comprises a metal armature 30 intended to interact with an electromagnet 15 at a zone Z 1 in which the armature 30 can come to bear against the electromagnet 15 against a force elastic exerted by a spring 32 centered on a heel 312 of the body 31.
  • a deflector 161 is provided on each lever 16, between the frame 30 and the axis 10 a while a second deflector 162 is provided between the frame 30 and the part of the body 31 intended to interact with the blade 21 of a hook 13.
  • the deflector 162 of this second embodiment can move inside a groove 102 formed in the housing 10 between the positions shown respectively on the left and on the right of Figure 6.
  • the deflector 162 protrudes with respect to the main portion 16a of the lever 16 both in the direction of the center line X 10 - X '10 of the housing 10 and both opposite the -this, so that the flow of fluff or dust is prevented both between the lever 16 and the electromagnet 15 and between the lever 16 and the external veil 10 g of the housing 10.
  • the deflector 162 also projects perpendicularly to the plane of FIG. 6 relative to the main part 16 a of the lever 16, which also avoids the rise of pollution in the direction of the frame 30.
  • the elastic blade 21 efficiently performs the selection and leveling functions, while it is not in contact with the neighboring knife 14, the function of direct interaction with the knife being devolved to the beak 202 of the body 20. Likewise, the body 20, through which the tensile force exerted by the knife 14 passes, does not come into direct contact with the selection device which comprises the elements 15 and 16.
  • the invention relates to the two-position crowd formation mechanisms used for weaving so-called “flat” fabrics, unlike the three-position mechanisms used for carpets and pile fabrics.
  • the invention can be used in the context of a combination of two-position mechanisms making it possible to obtain a crowd of three or four positions, as described, for example, in EP-B-0 399 930 or FR-B-2 715 666.

Abstract

The shed-forming mechanism for a Jacquard loom consists of a series of hooks (13) moved by a blade between a top position in which it can be stopped by a selector and a bottom position. Each hook comprises a body (20) and a projecting tip (202) that interacts with the blade, and is additionally equipped with a metal strip (21) that interacts with the selector (16). The strip is attached to the body of the hook and capable of a relative displacement (F3) in the selector zone, the body being made from a synthetic material that is overmoulded onto part (211) of the strip and is supple enough to adapt to faults in the trajectories of the body and blade. The strip is able to slide in a housing and has an aperture that engages with a projection on the selector.

Description

L'invention a trait à un mécanisme de formation de la foule et à un métier à tisser équipé d'un tel mécanisme.The invention relates to a crowd forming mechanism and to a loom equipped with such a mechanism.

Dans un métier à tisser de type Jacquard, un mécanisme de formation de la foule soulève sélectivement des lisses comprenant chacune 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 d'un fil de trame déplacé par le métier. Un tel mécanisme connu, par exemple de EP-A-0 219 437 comprend, en autres, des crochets mobiles pourvus chacun d'un bec latéral susceptible de coopérer avec des couteaux animés de mouvements alternatifs verticaux en opposition de phase. Chaque crochet mobile est pourvu d'une extrémité recourbée visant à permettre son immobilisation par coopération de formes avec un levier de retenue.In a Jacquard type loom, a shedding mechanism selectively lifts heddles each comprising an eyelet through which a warp thread passes, this thread being located, depending on the position of a hook to which the 'upper end of the heddle, above or below a weft thread moved by the loom. Such a known mechanism, for example from EP-A-0 219 437 comprises, among other things, movable hooks each provided with a lateral spout capable of cooperating with knives driven by alternating vertical movements in phase opposition. Each movable hook is provided with a curved end intended to allow its immobilization by cooperation of shapes with a retaining lever.

Chaque crochet mobile est également pourvu d'une languette élastique monobloc avec le crochet et destinée à commander le déplacement du levier de retenue. Une telle languette est soumise à des efforts répétés relativement intenses, susceptibles d'induire sa déformation permanente par fluage, voire sa rupture. Dans ce cas, la foule obtenue a des « fautes ».Each movable hook is also provided with a one-piece elastic tongue with the hook and intended to control the movement of the retaining lever. Such a tongue is subjected to relatively intense repeated forces, capable of inducing its permanent deformation by creep, or even its rupture. In this case, the crowd obtained has "faults".

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un mécanisme de formation de la foule dont les crochets mobiles sont robustes et dimensionnés de façon précise, ce qui assure un fonctionnement fiable du métier, alors qu'ils sont compacts en hauteur, c'est-à-dire parallèlement à leur direction de déplacement. Ceci permet de créer un mécanisme compact, d'où un gain de place et meilleures performances économiques.It is to these drawbacks that the invention more particularly intends to remedy by proposing a crowd formation mechanism whose movable hooks are robust and precisely dimensioned, which ensures reliable operation of the loom, while they are compact in height, that is to say parallel to their direction of movement. This makes it possible to create a compact mechanism, hence saving space and better economic performance.

Dans cet esprit, l'invention concerne un mécanisme de formation de la foule sur un métier à tisser de type Jacquard, ce mécanisme comprenant des crochets mobiles déplacés chacun par un couteau, entre une position de point mort haut, dans ou à proximité de laquelle chaque crochet peut être immobilisé par un dispositif de sélection, et une position de point mort bas, chaque crochet mobile comprenant un corps pourvu d'un bec, destiné à venir en appui sur le couteau précité. Ce mécanisme est caractérisé en ce que chaque crochet comprend, en outre, une lame métallique destinée à interagir avec le dispositif de sélection et fixée sur le corps précité, avec possibilité de débattement relatif par rapport au corps, dans une zone de ce corps opposée au dispositif de sélection par rapport à la zone du corps à partir de laquelle s'étend le bec.In this spirit, the invention relates to a crowd formation mechanism on a Jacquard type loom, this mechanism comprising movable hooks each moved by a knife, between a top dead center position, in or near which each hook can be immobilized by a selection device, and a bottom dead center position, each movable hook comprising a body provided with a spout , intended to bear on the aforementioned knife. This mechanism is characterized in that each hook further comprises a metal blade intended to interact with the selection device and fixed to the aforementioned body, with the possibility of relative movement relative to the body, in an area of this body opposite to the selection device with respect to the area of the body from which the beak extends.

Grâce à l'invention, le caractère bipartite des crochets mobiles, dont le corps est avantageusement réalisé en matière synthétique, permet de bénéficier de la robustesse du corps pour la liaison mécanique entre le crochet et le couteau, alors que la géométrie de la lame métallique est définie avec une grande précision, ce qui induit une grande fiabilité des interactions entre le crochet mobile et le dispositif de sélection. Comme la lame métallique est fixée sur le corps en partie basse lorsque le crochet est en configuration de fonctionnement du mécanisme, la flexibilité de la lame, sur sensiblement toute sa hauteur, peut être utilisée pour le déplacement transversal de sa partie plus particulièrement destinée à venir en engagement avec une partie correspondante du dispositif de sélection. Le fait qu'un débattement relatif est possible entre la lame et le corps du crochet peut provenir de la souplesse de la lame et/ou de celle du corps.Thanks to the invention, the bipartite nature of the mobile hooks, the body of which is advantageously made of synthetic material, makes it possible to benefit from the robustness of the body for the mechanical connection between the hook and the knife, while the geometry of the metal blade is defined with great precision, which induces a high reliability of the interactions between the movable hook and the selection device. As the metal blade is fixed to the body in the lower part when the hook is in the operating configuration of the mechanism, the flexibility of the blade, over substantially its entire height, can be used for the transverse movement of its part more particularly intended to come in engagement with a corresponding part of the selection system. The fact that a relative movement is possible between the blade and the body of the hook can come from the flexibility of the blade and / or that of the body.

Selon des aspects avantageux, mais non obligatoires de l'invention, ce mécanisme incorpore une ou plusieurs des caractéristiques des revendications dépendantes.According to advantageous, but not mandatory, aspects of the invention, this mechanism incorporates one or more of the features of the dependent claims.

En particulier, l'électro-aimant du dispositif de sélection peut être surmoulé dans un des côtés d'un boîtier de réception et de guidage en translation du crochet mobile. Ce surmoulage induit un positionnement précis de l'électro-aimant par rapport aux autres pièces fonctionnelles du dispositif, telles que les axes des leviers de retenue, les butées et les appuis de ces leviers ainsi que les rainures de guidage des crochets mobiles. Du fait de cette grande précision, les amplitudes des mouvements des pièces mobiles peuvent être réduites, notamment en ce qui concerne l'oscillation des leviers de retenue et la flexion de la lame des crochets mobiles. Ceci contribue également à la compacité du mécanisme.In particular, the electromagnet of the selection device can be molded into one of the sides of a receiving and guiding housing in translation of the movable hook. This overmolding induces precise positioning of the electromagnet relative to the other functional parts of the device, such as the axes of the retaining levers, the stops and the supports of these levers as well as the guide grooves of the movable hooks. Due to this high precision, the amplitudes of the movements of the moving parts can be reduced, in particular as regards the oscillation of the retaining levers and the bending of the blade of the movable hooks. This also contributes to the compactness of the mechanism.

L'invention concerne également un métier à tisser équipé d'un mécanisme de formation de la foule tel que précédemment décrit.The invention also relates to a weaving loom equipped with a shedding mechanism 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 trois modes de réalisation d'un mécanisme de formation de la foule conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une représentation schématique de principe illustrant un métier à tisser de type Jacquard incorporant l'invention ;
  • la figure 2 est une coupe longitudinale à plus grande échelle du mécanisme de formation de la foule du métier de la figure 1 ;
  • les figures 2A et 2B sont des sections partielles respectivement selon les lignes A-A et B-B à la figure 2 ;
  • la figure 3 est une vue à plus grande échelle d'un crochet mobile et d'une partie d'un levier de retenue du mécanisme de la figure 2 ;
  • la figure 4 est une vue dans le sens de la flèche IV à la figure 3 ;
  • la figure 5 est une vue analogue à la figure 2 pour un mécanisme conforme à un second mode de réalisation de l'invention ;
  • la figure 6 est une coupe longitudinale partielle de principe d'un mécanisme conforme à un troisième mode de réalisation et
  • la figure 6A est une section partielle selon la ligne A-A à la figure 6.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of three embodiments of a crowd formation mechanism in accordance with its principle, given solely by way of example and made with reference to the accompanying drawings, in which:
  • Figure 1 is a schematic representation of principle illustrating a Jacquard type loom incorporating the invention;
  • Figure 2 is a longitudinal section on a larger scale of the crowd forming mechanism of the loom of Figure 1;
  • Figures 2A and 2B are partial sections respectively along lines AA and BB in Figure 2;
  • Figure 3 is an enlarged view of a movable hook and part of a retaining lever of the mechanism of Figure 2;
  • Figure 4 is a view in the direction of arrow IV in Figure 3;
  • Figure 5 is a view similar to Figure 2 for a mechanism according to a second embodiment of the invention;
  • FIG. 6 is a partial longitudinal section in principle of a mechanism according to a third embodiment and
  • FIG. 6A is a partial section along the line AA in FIG. 6.

Dans le métier à tisser M représenté à la figure 1, une nappe de fils de chaîne 1 provient d'une ensouple 2. Chaque fil de chaîne 1 passe dans l'oeillet 3a d'une lisse 3 destiné à ouvrir le pas pour permettre le passage d'une duite en vue de constituer le tissu qui s'enroule sur une bobine 4. Seules deux lisses 3 et 3' sont représentées à la figure 1, la lisse 3 étant en position haute, alors que la lisse 3' est en position basse. 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.In the weaving loom M represented in FIG. 1, a ply of warp threads 1 comes from a beam 2. Each warp thread 1 passes through the eyelet 3 has a heddle 3 intended to open the pitch to allow the passage of a pick in order to constitute the fabric which is wound on a reel 4. Only two heddles 3 and 3 'are shown in FIG. 1, the heald 3 being in the high position, while the heald 3' is in the low position. The lower end of each heddle is connected to the frame of the loom by a tension spring 5, while its upper end is secured to an arch 6.

Un mécanisme de formation de la foule 7 associé à une unité de commande électronique 8 permet de soulever plus ou moins les arcades 6 à l'encontre d'un effort de rappel exercé par les ressorts 5. Comme représenté uniquement pour l'arcade associée à la lisse 3, chaque arcade a une extrémité 6a solidaire d'un boîtier 10 du mécanisme 7, cette arcade passant dans un moufle 11 suspendu à un cordon 12 dont les deux extrémités sont respectivement solidaires de deux crochets mobiles 13 destinés à être sélectivement soulevés par des couteaux 14 animés d'un mouvement d'oscillations verticales en opposition de phase, tel que figuré par les flèches F2.A shedding mechanism 7 associated with an electronic control unit 8 allows the arches 6 to be raised more or less against a return force exerted by the springs 5. As shown only for the arch associated with the heddle 3, each arch has one end 6 a secured to a housing 10 of the mechanism 7, this arch passing through a block 11 suspended from a cord 12, the two ends of which are respectively secured to two movable hooks 13 intended to be selectively raised by knives 14 animated by a movement of vertical oscillations in phase opposition, as shown by the arrows F 2 .

Seule une partie des éléments constitutifs du mécanisme de formation de la foule est représentée à la figure 1 pour la clarté du dessin.Only part of the components of the shedding mechanism is shown in Figure 1 for clarity of the drawing.

Comme il ressort plus particulièrement des figures 2 à 4, chaque crochet 13 est formé d'un corps en matière plastique 20 dans l'extrémité inférieure 201 duquel est surmoulée une extrémité 12a du cordon 12.As can be seen more particularly from FIGS. 2 to 4, each hook 13 is formed by a plastic body 20 in the lower end 201 from which an end 12 a of the cord 12 is molded.

Le corps 20 forme un unique bec 202 qui s'étend latéralement par rapport à un axe longitudinal principal X-X' du corps 20. Ce bec 202 est destiné à venir en appui sur la surface supérieure 14a d'un couteau 14. Le crochet 13 peut ainsi être régulièrement soulevé par un unique couteau 14.The body 20 forms a single spout 202 that extends laterally with respect to a main longitudinal axis XX 'of the body 20. This nozzle 202 is intended to bear against the upper surface 14 has a knife 14. The hook 13 can thus be regularly lifted by a single knife 14.

Compte tenu de son matériau constitutif, le corps 20 présente une certaine souplesse lui permettant de s'adapter à un éventuel défaut de position ou de parallélisme des trajectoires respectives de ce corps et du couteau 14 associé. Cette possibilité de déformation élastique du corps 20 est représentée par la double flèche F20 à la figure 2. En pratique, la souplesse du corps 20 permet d'obtenir un auto-positionnement du bec 202 sur le couteau 14.Given its constituent material, the body 20 has a certain flexibility allowing it to adapt to a possible defect in position or parallelism of the respective trajectories of this body and of the associated knife 14. This possibility of elastic deformation of the body 20 is represented by the double arrow F 20 in FIG. 2. In practice, the flexibility of the body 20 allows self-positioning of the spout 202 on the knife 14.

Le crochet 13 comprend également une lame métallique 21 partiellement surmoulée dans le corps 20. En pratique, la lame 21 comprend une partie 211 surmoulée dans une zone 203 du corps 20, située à proximité de son extrémité inférieure 201, c'est-à-dire au-dessous de la partie 204 du corps 20 à partir de laquelle s'étend latéralement le bec 202.The hook 13 also includes a metal blade 21 partially overmolded in the body 20. In practice, the blade 21 comprises a part 211 overmolded in an area 203 of the body 20, located near its lower end 201, that is to say say below the part 204 of the body 20 from which the spout 202 extends laterally.

La partie 211 est ouverte vers le bas, ce qui permet le passage de l'extrémité 12a du cordon 12 qui peut donc être surmoulée dans le corps 20 sur une longueur L12 relativement importante.The part 211 is open downwards, which allows the passage of the end 12 a of the cord 12 which can therefore be molded into the body 20 over a relatively large length L 12 .

La lame 21 s'étend sur une longueur L21 au-dessus de sa partie 211, cette longueur étant relativement importante par rapport à la longueur total L'21 de la lame 21The blade 21 extends over a length L 21 above its part 211, this length being relatively large compared to the total length L '21 of the blade 21

La lame 21 comprend deux montants latéraux 212 et 212' définissant entre eux une fenêtre 213 dans laquelle est logée la majeure partie du corps 20.The blade 21 comprises two lateral uprights 212 and 212 'defining between them a window 213 in which the major part of the body 20 is housed.

Les montants 212 et 212' se prolongent au delà de la fenêtre 213 jusqu'à une extrémité recourbée 214. Les montants 212 et 212' sont reliés par une traverse 215 qui sépare la fenêtre 213 d'une ouverture 216 ménagée entre les parties 212, 212', 214 et 215 de la lame 21.The uprights 212 and 212 'extend beyond the window 213 to a curved end 214. The uprights 212 and 212' are connected by a crosspiece 215 which separates the window 213 from an opening 216 formed between the parts 212, 212 ', 214 and 215 of the blade 21.

Compte tenu de leur mode de fixation respectif, les éléments 20 et 21 sont solidaires en partie basse du crochet 13, alors que la partie de la lame 21 qui s'étend sur la longueur L21 au-dessus de la zone 203 du corps 20, est susceptible de débattements latéraux, comme représenté par la double flèche F3 à la figure 3. Ces débattements latéraux F3 correspondent, en fait, à un débattement relatif de la lame 21 par rapport au corps 20.Given their respective method of attachment, the elements 20 and 21 are integral in the lower part of the hook 13, while the part of the blade 21 which extends over the length L 21 above the area 203 of the body 20 , is susceptible to lateral deflections, as represented by the double arrow F 3 in FIG. 3. These lateral deflections F 3 correspond, in fact, to a relative deflection of the blade 21 relative to the body 20.

Le mécanisme 7 comprend également un électro-aimant 15 surmoulé dans une partie du boîtier 10. Ce surmoulage assure un positionnement précis de l'électro-aimant 15 par rapport au boîtier 10 et aux éléments qu'il supporte ou guide.The mechanism 7 also includes an electromagnet 15 overmolded in a part of the housing 10. This overmolding ensures precise positioning of the electromagnet 15 relative to the housing 10 and to the elements that it supports or guides.

Le boîtier 10 comporte deux axes fixes 10a sur lesquels sont montés à pivotement deux leviers de retenue 16 destinés à coopérer respectivement avec les deux crochets mobiles 13 reliés aux deux extrémités d'un même cordon 12.The housing 10 comprises two fixed axes 10 a on which are pivotally mounted two retaining levers 16 intended to cooperate respectively with the two movable hooks 13 connected to the two ends of the same cord 12.

Chaque levier 16 comprend une armature métallique 30 pourvue d'un perçage cylindrique à section circulaire 301 adapté au diamètre extérieur d'un axe 10a, de telle sorte que l'armature 30 peut être montée autour d'un axe 10a avec possibilité de pivotement, comme représenté par les doubles flèches F4 à la figure 2. Le perçage 301 de chaque armature 30 est ménagé dans une extrémité 302 de cette armature.Each lever 16 comprises a metal frame 30 provided with a cylindrical bore with a circular section 301 adapted to the outside diameter of an axis 10 a , so that the frame 30 can be mounted around an axis 10 a with the possibility of swiveling, as shown by the double arrows F 4 in FIG. 2. The bore 301 of each frame 30 is formed in one end 302 of this frame.

A son extrémité opposée 303, l'armature 30 est surmoulée dans un corps 31 réalisé dans une matière amagnétique, telle qu'une matière synthétique et, plus spécifiquement, une matière plastique. Le corps 31 forme un bec 311 de retenue d'un crochet mobile 13 à proximité de sa position de point mort haut. Le corps 31 est également pourvu d'un talon 312 de centrage par rapport à un ressort 32 exerçant sur le corps 31 un effort F5 tendant à faire pivoter le levier 16 vers l'extérieur du boîtier 6. Cet effort tend à faire pénétrer le bec 311 dans l'ouverture 216 de la lame 21 d'un crochet mobile voisin, ce qui permet de retenir un tel crochet mobile en position haute.At its opposite end 303, the frame 30 is molded into a body 31 made of a non-magnetic material, such as a synthetic material and, more specifically, a plastic material. The body 31 forms a spout 311 for retaining a movable hook 13 near its top dead center position. The body 31 is also provided with a heel 312 for centering with respect to a spring 32 exerting on the body 31 a force F 5 tending to pivot the lever 16 towards the outside of the housing 6. This force tends to cause the spout 311 in the opening 216 of the blade 21 of a neighboring movable hook, which makes it possible to retain such a movable hook in the high position.

L'armature métallique 30 d'un levier 16 permet de contrôler son pivotement grâce à l'électro-aimant 15, un levier 16 pouvant être déplacé par l'extrémité recourbée 214 d'une lame 21, et, éventuellement, maintenu en position à l'encontre de l'effort F5, lorsque l'électro-aimant 15 est excité.The metal frame 30 of a lever 16 makes it possible to control its pivoting thanks to the electromagnet 15, a lever 16 which can be moved by the curved end 214 of a blade 21, and, optionally, held in position at against the force F 5 , when the electromagnet 15 is excited.

Le corps 31 permet une interaction efficace et sans contact métal/métal d'un levier de retenue 16 avec un crochet mobile 13.The body 31 allows an efficient interaction without metal / metal contact of a retaining lever 16 with a movable hook 13.

Les leviers 16 sont chacun pourvus d'un déflecteur 161 faisant saillie par rapport à leur partie principale 16a en direction de l'axe médian X10-X'10 du boîtier 10, entre son axe d'articulation 10a et une zone Z1 dans laquelle l'armature 30 peur venir en appui contre l'électro-aimant 15. Un second déflecteur 162 est prévu entre la zone Z1 et le crochet 13 adjacent. Les déflecteurs 161 et 162 sont mobiles avec le levier 16, à l'intérieur de rainures 101 et 102 ménagées dans le corps 10, ce qui leur permet d'isoler la zone Z1 qui forme ainsi une chambre fermée protégée contre la pollution, notamment la bourre susceptible d'être transportée par un crochet 13.The levers 16 are each provided with a deflector 161 projecting relative to their main part 16 a in the direction of the central axis X 10 -X '10 of the housing 10, between its articulation axis 10 a and a zone Z 1 in which the armature 30 can come to bear against the electromagnet 15. A second deflector 162 is provided between the zone Z 1 and the adjacent hook 13. The deflectors 161 and 162 are movable with the lever 16, inside grooves 101 and 102 formed in the body 10, which allows them to isolate the zone Z 1 which thus forms a protected closed chamber against pollution, in particular the flock capable of being transported by a hook 13.

Compte tenu du positionnement des axes 10a sur le boîtier 10 et de la géométrie des leviers 16, ces leviers s'étendent uniquement vers le bas à partir de ces axes fixes, ce qui confère au mécanisme 7 une compacité améliorée par rapport aux mécanismes dans lesquels le levier s'étend de part et d'autre de son axe d'articulation, comme décrit par exemple, dans EP-A-0 219 437.Given the positioning of the axes 10 a on the housing 10 and the geometry of the levers 16, these levers extend only downward from these fixed axes, which gives the mechanism 7 an improved compactness compared to the mechanisms in which the lever extends on either side of its axis of articulation, as described for example, in EP-A-0 219 437.

Par ailleurs, les montants 212 et 212' de la lame 21 d'un crochet 13 coulissent dans des rainures 10b ménagées sur la hauteur du boîtier 10, comme le montre la figure 2 où les cordons 12 ont été représentés partiellement pour que les rainures 10b soient visibles. Ainsi, le guidage d'un levier 13 par rapport au boîtier 10 est effectué de façon précise et avec une usure minimale. Comme il ressort des figures 2A et 2B, chaque rainure 10b du boîtier 10 est délimitée par deux nervures 10f et 10f' entre lesquelles elle s'étend, ce qui permet un guidage efficace du montant 212 ou 212' qu'elle reçoit. Chaque nervure a cette forme du bas du boîtier 10 jusqu'à approximativement l'emplacement de la partie bombée supérieure du bec 202 sur la droite de la figure 2 où la nervure 10f' est supprimée, alors que la nervure 10f se prolonge vers le haut. La suppression du bord externe 10f' de la rainure, c'est-à-dire le fait qu'elle est ouverte vers l'extérieur du boîtier à proximité du levier de retenue 16, permet le débattement vers l'extérieur de la lame 21, dans le sens de la flèche F7 à la figure 2B, lorsque la lame 21 vient en appui contre le levier 16 voisin, comme représenté sur la gauche de la figure 2, pour exercer un effort de nivelage F6.Furthermore, the uprights 212 and 212 'of the blade 21 of a hook 13 slide in grooves 10b formed on the height of the housing 10, as shown in Figure 2 where the cords 12 have been partially shown so that the grooves 10 b are visible. Thus, the guidance of a lever 13 relative to the housing 10 is carried out precisely and with minimal wear. As is apparent from FIGS. 2A and 2B, each groove 10b of the housing 10 is delimited by two ribs 10f and 10f 'between which it extends, which allows effective guidance of the upright 212 or 212' which it receives . Each rib has this shape from the bottom of the housing 10 to approximately the location of the upper curved portion of the spout 202 on the right of FIG. 2 where the rib 10 f 'is removed, while the rib 10 f extends towards the top. The removal of the external edge 10 f ′ of the groove, that is to say the fact that it is open towards the outside of the housing near the retaining lever 16, allows the movement towards the outside of the blade 21, in the direction of arrow F 7 in FIG. 2B, when the blade 21 comes to bear against the neighboring lever 16, as shown on the left in FIG. 2, to exert a leveling force F 6 .

En pratique, l'essentiel de la flexion de la lame 21 a lieu au niveau de la partie du boîtier 10 où la rainure 10b est dépourvue de bord externe, cette partie s'étendant sur une hauteur H, entre la position du haut du bec 202 sur la droite de la figure 2 et la zone d'interaction entre la lame 21 et le levier 16 lors du nivelage.In practice, most of the bending of the blade 21 takes place at the part of the housing 10 where the groove 10b has no external edge, this part extending over a height H, between the position of the top of the spout 202 on the right in FIG. 2 and the interaction zone between the blade 21 and the lever 16 during leveling.

Selon une variante non représentée de l'invention, la nervure 10f' qui forme le bord externe de la rainure 10b peut ne pas être supprimée sur la hauteur H mais s'écarter de la nervure 10f pour laisser à la lame 21 un espace de débattement suffisant.According to a variant not shown of the invention, the rib 10 f ′ which forms the outer edge of the groove 10 b may not be removed over the height H but deviate from the rib 10 f to leave the blade 21 a sufficient clearance.

Dans le mode de réalisation représenté et dans la variante mentionnée ci-dessus, l'élargissement ou l'ouverture de la rainure 10b vers l'extérieur à proximité des éléments 15 et 16 vise à permettre la flexion de la lame 21 dans cette zone.In the embodiment shown and in the variant mentioned above, the widening or opening of the groove 10 b towards the outside near the elements 15 and 16 aims to allow the bending of the blade 21 in this area .

Conformément à l'enseignement technique de FR-A-2 752 246, une butée 40 chargée élastiquement par un ressort 41 est montée, entre les trajets de coulissement de deux crochets mobiles 13, en appui sur des taquets 10c du boîtier 10. Cette butée élastique 40 est destinée à coopérer avec un talon 205 ménagé à proximité de l'extrémité 201 de chaque corps 20. Compte tenu du positionnement respectif des éléments 205 et 40, cette interaction a lieu lorsque chaque crochet mobile 13 arrive au voisinage de sa position de point mort haut. Cette disposition permet de vaincre l'essentiel des forces d'inertie et de frottement des crochets mobiles, ce qui facilité l'inversion de mouvement et permet d'optimiser le dimensionnement du harnais et des pièces mécaniques d'entraînement, telles que les couteaux 14, ou de rappel élastique, tel que les ressorts 5.According to the technical teaching of FR-A-2 752 246, a stop 40 loaded elastically by a spring 41 is mounted, between the sliding paths of two movable hooks 13, bearing on tabs 10 c of the housing 10. This elastic stop 40 is intended to cooperate with a heel 205 formed near the end 201 of each body 20. Given the respective positioning of the elements 205 and 40, this interaction takes place when each movable hook 13 arrives in the vicinity of its position from top dead center. This arrangement makes it possible to overcome most of the inertial and friction forces of the movable hooks, which facilitates the reversal of movement and makes it possible to optimize the dimensioning of the harness and of the mechanical drive parts, such as the knives 14 , or elastic return, such as springs 5.

L'extrémité recourbée 214 de la lame 21 est également dimensionnée de telle sorte qu'elle peut venir en appui et exercer un effort F6 contre une rampe 313 formée par le corps 31 de chaque levier 16. Cet appui momentané d'un crochet 13 sur un levier 16 permet de procéder au nivelage du levier 16, c'est-à-dire sa mise en appui sur l'électro-aimant 15, avec précharge élastique du fait de la flexion de la lame 21 qui assure la fonction de la languette élastique décrite dans EP-A-0 219 437. La lame 21 assure donc une fonction de nivelage.The curved end 214 of the blade 21 is also dimensioned so that it can come to bear and exert a force F 6 against a ramp 313 formed by the body 31 of each lever 16. This momentary support of a hook 13 on a lever 16 allows leveling of the lever 16, that is to say its setting on the electromagnet 15, with elastic preload due to the bending of the blade 21 which performs the function of the elastic tongue described in EP-A-0 219 437. The blade 21 therefore provides a leveling function.

Dans le second mode de réalisation de l'invention représenté à la figure 5, les éléments analogues à ceux du premier mode de réalisation portent des références identiques. Comme précédemment, des couteaux 14 permettent de déplacer sélectivement des crochets mobiles 13 comprenant chacun un corps 20 en matière synthétique et une lame métallique élastique 21 qui s'étend, pour l'essentiel, au-dessus de la zone où elle est fixée à ce corps. Des leviers de retenue 16 sont associés à un électro-aimant 15.In the second embodiment of the invention shown in Figure 5, elements similar to those of the first embodiment bear identical references. As before, knives 14 make it possible to selectively move movable hooks 13 each comprising a body 20 of synthetic material and an elastic metal blade 21 which extends, essentially, above the zone where it is fixed to this body. Retaining levers 16 are associated with an electromagnet 15.

Dans ce mode de réalisation, les leviers 16 sont montés à pivotement autour d'axes 10a fixes par rapport à un boîtier 10. Il est ici fait application de l'enseignement technique de EP-A-0 577 524 dans la mesure où le boîtier 10 comprend des cloisons 10d permettant d'isoler l'électro-aimant 15 de l'atmosphère ambiante. Chaque levier 16 est monté à pivotement sur l'axe 10a correspondant, comme représenté par la double F4 et comprend une armature 30 qui s'étend de part et d'autre de l'axe 10a sur lequel elle est montée. Plus précisément, chaque armature 30 comprend une première branche 304 qui s'étend vers le haut à partir d'une partie centrale 305 dans laquelle est ménagé un perçage circulaire 301 de réception de l'axe 10a. La branche 304 est destinée à interagir avec l'électro-aimant 15 en fonction de son activation. L'armature 30 comprend également une branche 306 qui s'étend à l'opposé de la branche 304 par rapport à la partie 305. Cette branche 306 est surmoulée dans un corps 31 en matière plastique qui forme un bec 311 destiné à interagir avec une ouverture 216 de la lame 21 d'un crochet 13. Le corps 31 forme également une rampe 313 de nivelage de la position du levier 16 utilisée lors d'une interaction avec l'extrémité supérieure recourbée 214 d'une lame 21. La lame 21 exerce alors sur le levier 16 un effort F6 de déplacement de l'armature 30 vers l'électro-aimant 15.In this embodiment, the levers 16 are pivotally mounted around axes 10a fixed relative to a housing 10. It is here applied to the technical teaching of EP-A-0577524 to the extent that the housing 10 comprises partitions 10 d making it possible to isolate the electromagnet 15 from the ambient atmosphere. Each lever 16 is pivotally mounted on the axle 10 has corresponding, as represented by double-F 4 and comprises a frame 30 which extends on either side of the axis 10 a on which it is mounted. More specifically, each frame 30 comprises a first branch 304 which extends upwards from a central part 305 in which is formed a circular bore 301 for receiving the axis 10 a . The branch 304 is intended to interact with the electromagnet 15 as a function of its activation. The frame 30 also comprises a branch 306 which extends opposite the branch 304 relative to the part 305. This branch 306 is molded into a body 31 of plastic material which forms a spout 311 intended to interact with an opening 216 of the blade 21 of a hook 13. The body 31 also forms a ramp 313 for leveling the position of the lever 16 used during an interaction with the curved upper end 214 of a blade 21. The blade 21 then exerts on the lever 16 a force F 6 for moving the armature 30 towards the electromagnet 15.

Pour isoler efficacement l'électro-aimant 15, les cloisons 10d du boîtier 10 sont pourvues de joints d'étanchéité 10e disposés à proximité de la surface externe cylindrique à base circulaire 305a de la partie 305. Ainsi, indépendamment de l'orientation d'un levier 16 autour de l'axe 10a, une étanchéité satisfaisante peut être assurée.To effectively isolate the electromagnet 15, the partitions 10 d of the housing 10 are provided with seals 10 e disposed near the cylindrical external surface with circular base 305 a of the part 305. Thus, independently of the orientation of a lever 16 around the axis 10 a , a satisfactory seal can be ensured.

En variante, les cloisons 10d peuvent être prévues à jeu réduit par rapport à la surface 305a, les joints 10e pouvant alors être supprimés car les extrémités des cloisons 10d constituent alors des moyens d'étanchéité à la poussière.As a variant, the partitions 10 d can be provided with reduced clearance with respect to the surface 305 a , the seals 10 e can then be removed because the ends of the partitions 10 d then constitute dust-proofing means.

Dans le troisième mode de réalisation représenté à la figure 6, les éléments analogues à ceux du premier mode de réalisation portent des références identiques. Comme précédemment, des crochets 13 comprennent chacun un corps 20 en matière plastique ainsi qu'une lame métallique 21, ces éléments étant surmoulés l'un dans l'autre en partie basse du corps 20. Un mouvement de débattement relatif F3 est possible entre le corps 20 et la lame 21 de chaque crochet. La lame 21 de chaque crochet peut être retenue en position par un bec 311 formé par un corps 31 d'un levier de retenu 16 monté pivotant autour d'un axe 10a formé par un boîtier 10.In the third embodiment shown in Figure 6, elements similar to those of the first embodiment bear identical references. As before, hooks 13 each comprise a body 20 of plastic material as well as a metal blade 21, these elements being molded into each other in the lower part of the body 20. A relative movement of movement F 3 is possible between the body 20 and the blade 21 of each hook. The blade 21 of each hook can be retained in position by a spout 311 formed by a body 31 of a retaining lever 16 mounted pivoting about an axis 10 a formed by a housing 10.

Chaque levier 16 comprend une armature métallique 30 destinée à interagir avec un électro-aimant 15 au niveau d'une zone Z1 dans laquelle l'armature 30 peut venir en appui contre l'électro-aimant 15 à l'encontre d'un effort élastique exercé par un ressort 32 centré sur un talon 312 du corps 31.Each lever 16 comprises a metal armature 30 intended to interact with an electromagnet 15 at a zone Z 1 in which the armature 30 can come to bear against the electromagnet 15 against a force elastic exerted by a spring 32 centered on a heel 312 of the body 31.

Comme dans le premier mode de réalisation, un déflecteur 161 est prévu sur chaque levier 16, entre l'armature 30 et l'axe 10a alors qu'un second déflecteur 162 est prévu entre l'armature 30 et la partie du corps 31 destinée à interagir avec la lame 21 d'un crochet 13. Le déflecteur 162 de ce second mode de réalisation peut se déplacer à l'intérieur d'une rainure 102 ménagée dans le boîtier 10 entre les positions représentées respectivement sur la gauche et sur la droite de la figure 6. Ce déflecteur 162 fait saillie par rapport à la partie principale 16a du levier 16 à la fois en direction de l'axe médian X10- X'10 du boîtier 10 et à la fois à l'opposé de celui-ci, de telle sorte que la circulation de bourre ou de poussière est empêchée à la fois entre le levier 16 et l'électroaimant 15 et entre le levier 16 et le voile externe 10g du boîtier 10.As in the first embodiment, a deflector 161 is provided on each lever 16, between the frame 30 and the axis 10 a while a second deflector 162 is provided between the frame 30 and the part of the body 31 intended to interact with the blade 21 of a hook 13. The deflector 162 of this second embodiment can move inside a groove 102 formed in the housing 10 between the positions shown respectively on the left and on the right of Figure 6. the deflector 162 protrudes with respect to the main portion 16a of the lever 16 both in the direction of the center line X 10 - X '10 of the housing 10 and both opposite the -this, so that the flow of fluff or dust is prevented both between the lever 16 and the electromagnet 15 and between the lever 16 and the external veil 10 g of the housing 10.

En outre, et comme il ressort plus particulièrement de la figure 6A le déflecteur 162 fait également saillie perpendiculairement au plan de la figure 6 par rapport à la partie principale 16a du levier 16, ce qui évite également les remontée de pollution en direction de l'armature 30.In addition, and as appears more particularly from FIG. 6A, the deflector 162 also projects perpendicularly to the plane of FIG. 6 relative to the main part 16 a of the lever 16, which also avoids the rise of pollution in the direction of the frame 30.

Quel que soit le mode de réalisation considéré, la lame élastique 21 assure efficacement les fonctions de sélection et de nivelage, alors qu'elle n'est pas en contact avec le couteau 14 voisin, la fonction d'interaction directe avec le couteau étant dévolue au bec 202 du corps 20. De la même façon, le corps 20, par lequel transite l'effort de traction exercé par le couteau 14, n'entre pas directement en contact avec le dispositif de sélection qui comprend les éléments 15 et 16.Whatever the embodiment considered, the elastic blade 21 efficiently performs the selection and leveling functions, while it is not in contact with the neighboring knife 14, the function of direct interaction with the knife being devolved to the beak 202 of the body 20. Likewise, the body 20, through which the tensile force exerted by the knife 14 passes, does not come into direct contact with the selection device which comprises the elements 15 and 16.

Les caractéristiques des différents modes de réalisation décrits peuvent être combinées dans le cadre de la présente invention.The characteristics of the various embodiments described can be combined within the scope of the present invention.

L'invention concerne les mécanismes de formation de la foule à deux positions utilisés pour le tissage de tissus dits « plats », à la différence des mécanismes à trois positions utilisés pour les tapis et les velours. Cependant l'invention est utilisable dans le cadre d'association de mécanismes à deux positions permettant d'obtenir une foule à trois ou quatre positions, comme décrit, par exemple, dans EP-B-0 399 930 ou FR-B-2 715 666.The invention relates to the two-position crowd formation mechanisms used for weaving so-called “flat” fabrics, unlike the three-position mechanisms used for carpets and pile fabrics. However, the invention can be used in the context of a combination of two-position mechanisms making it possible to obtain a crowd of three or four positions, as described, for example, in EP-B-0 399 930 or FR-B-2 715 666.

Claims (16)

Mécanisme de formation de la foule sur un métier à tisser de type Jacquard, ledit mécanisme comprenant des crochets mobiles déplacés chacun par un couteau entre une position de point mort haut, dans ou à proximité de laquelle chaque crochet peut être immobilisé par un dispositif de sélection, et une position de point mort bas, chaque crochet mobile comprenant un corps pourvu d'un bec destiné à venir en appui sur ledit couteau, caractérisé en ce que chaque crochet comprend, en outre, une lame métallique (21) destinée à interagir avec ledit dispositif de sélection (15, 16) et fixée sur ledit corps (20), avec possibilité de débattement relatif (F3) par rapport audit corps, dans une zone (203) dudit corps opposée audit dispositif de sélection par rapport à une zone (204) dudit corps à partir de laquelle s'étend ledit bec (202).Crowd formation mechanism on a Jacquard loom, said mechanism comprising movable hooks each moved by a knife between a top dead center position, in or near which each hook can be immobilized by a selection device , and a bottom dead center position, each movable hook comprising a body provided with a spout intended to come to bear on said knife, characterized in that each hook further comprises a metal blade (21) intended to interact with said selection device (15, 16) and fixed to said body (20), with the possibility of relative movement (F 3 ) with respect to said body, in a zone (203) of said body opposite said selection device with respect to a zone (204) of said body from which extends said spout (202). Mécanisme selon la revendication 1, caractérisé en ce que ledit corps (20) est en matière synthétique et surmoulé sur une partie (211) de ladite lame.Mechanism according to claim 1, characterized in that said body (20) is made of synthetic material and molded onto a part (211) of said blade. Mécanisme selon l'une des revendications précédentes, caractérisé en ce que ledit corps (20) est souple au point de s'adapter à un éventuel défaut de position relative ou de parallélisme des trajectoires respectives dudit corps et du couteau (14) sur lequel son bec (202) est en appui.Mechanism according to one of the preceding claims, characterized in that said body (20) is flexible to the point of adapting to a possible lack of relative position or parallelism of the respective trajectories of said body and of the knife (14) on which its spout (202) is in support. Mécanisme selon l'une des revendications précédente, caractérisé en ce que ladite lame (21) est apte à exercer sur un levier mobile (16) du dispositif de sélection un effort (F6) d'appui sur un électro-aimant (15) de contrôle du pivotement dudit levier.Mechanism according to one of the preceding claims, characterized in that said blade (21) is capable of exerting on a movable lever (16) of the selection device a force (F 6 ) for pressing on an electromagnet (15) for controlling the pivoting of said lever. Mécanisme selon l'une des revendications précédentes, caractérisé en ce que ladite lame (21) est pourvue d'une fenêtre (213) de réception d'une partie au moins dudit corps (20).Mechanism according to one of the preceding claims, characterized in that said blade (21) is provided with a window (213) for receiving at least part of said body (20). Mécanisme selon l'une des revendications précédentes, caractérisé en ce que ladite lame (21) est pourvue d'au moins une ouverture (216) d'engagement d'un bec de sélection (311) appartenant audit dispositif de sélection (15, 16).Mechanism according to one of the preceding claims, characterized in that said blade (21) is provided with at least one opening (216) for engaging a selection spout (311) belonging to said selection device (15, 16 ). Mécanisme selon l'une des revendications précédentes, caractérisé en ce que ladite lame (21) comporte deux côtés (212, 212') aptes à coulisser dans des rainures (10b) d'un boîtier (10) de réception et de guidage en translation dudit crochet mobile (13), ledit corps (20) étant ainsi positionné par rapport audit boîtier.Mechanism according to one of the preceding claims, characterized in that said blade (21) has two sides (212, 212 ') capable of sliding in grooves (10 b ) of a housing (10) for receiving and guiding in translation of said movable hook (13), said body (20) being thus positioned relative to said housing. Mécanisme selon la revendication 7, caractérisé en ce que ladite rainure (10b) s'élargit ou débouche vers l'extérieur dudit boîtier (10) à proximité dudit dispositif de sélection (15, 16).Mechanism according to claim 7, characterized in that said groove (10 b ) widens or opens outwards from said housing (10) near said selection device (15, 16). Mécanisme selon l'un des revendications précédentes, dans lequel ledit dispositif de retenue comprend au moins un levier de retenue (16), caractérisé en ce que ledit levier comprend une armature métallique (30), apte à interagir avec un électro-aimant (15) pour le contrôle de la position dudit levier, et une partie amagnétique (31) formant relief (311) adaptée pour coopérer avec ladite lame métallique (21) et fixée sur ladite armature.Mechanism according to one of the preceding claims, in which said retaining device comprises at least one retaining lever (16), characterized in that said lever comprises a metal frame (30), capable of interacting with an electromagnet (15 ) for controlling the position of said lever, and a non-magnetic part (31) forming a relief (311) adapted to cooperate with said metal blade (21) and fixed on said frame. Mécanisme selon la revendication 9, caractérisé en ce que ledit levier de retenue (16) est monté à pivotement autour d'un axe fixe (10a) à partir duquel il s'étend globalement vers le bas en configuration de fonctionnement dudit mécanisme.Mechanism according to claim 9, characterized in that said retaining lever (16) is pivotally mounted about a fixed axis (10 a) from which it extends generally downwardly in the operating configuration of said mechanism. Mécanisme selon l'une des revendications 9 ou 10, caractérisé en ce que ledit levier de retenue (16) est pourvu d'au moins un déflecteur (161, 162) apte à isoler de l'extérieur une chambre dans laquelle est située la zone (Z1) d'interaction entre ladite armature (30) et ledit électro-aimant (15).Mechanism according to one of claims 9 or 10, characterized in that said retaining lever (16) is provided with at least one deflector (161, 162) able to isolate from outside a chamber in which is located the zone (Z 1 ) of interaction between said armature (30) and said electromagnet (15). Mécanisme selon la revendication 11, caractérisé en ce que ledit ou l'un desdits déflecteurs (162) s'étend de part et d'autre d'une partie principale (16a) dudit levier (16).Mechanism according to claim 11, characterized in that said or one of said deflectors (162) extends on either side of a main part (16 a ) of said lever (16). Mécanisme selon l'une des revendications 11 ou 12, caractérisé en ce que ledit ou l'un desdits déflecteurs (162) est disposé entre ladite chambre (Z1) et le crochet (13) adjacent audit levier (16).Mechanism according to one of claims 11 or 12, characterized in that said or one of said deflectors (162) is disposed between said chamber (Z 1 ) and the hook (13) adjacent to said lever (16). Mécanisme selon la revendication 9, caractérisé en ce que ledit levier de retenue (16) est monté à pivotement autour d'un axe (10a) fixe par rapport à un boîtier (10) isolant ledit électro-aimant (15) de l'atmosphère ambiante, ledit levier de retenue s'étendant à la fois à l'intérieur et à l'extérieur dudit boîtier, alors que des moyens d'étanchéité (10e) sont prévus entre ledit boîtier et une partie circulaire (305) dudit levier de retenue sensiblement centrée sur ledit axe.Mechanism according to claim 9, characterized in that said retaining lever (16) is pivotally mounted about an axis (10 a ) fixed relative to a housing (10) isolating said electromagnet (15) from the ambient atmosphere, said retaining lever extending both inside and outside of said housing, while sealing means (10 e ) are provided between said housing and a circular part (305) of said lever retainer substantially centered on said axis. Mécanisme selon l'une des revendications précédentes dans lequel ledit dispositif de sélection comprend un électro-aimant, caractérisé en ce que ledit électro-aimant (15) est surmoulé dans un des côtés d'un boîtier (10) de séparation et de guidage dudit crochet de retenue (13).Mechanism according to one of the preceding claims, in which said selection device comprises an electromagnet, characterized in that said electromagnet (15) is molded into one of the sides of a housing (10) for separating and guiding said said retaining hook (13). Métier à tisser (M) équipé d'un mécanisme de formation de la foule (7-306) selon l'une des revendications précédentes.Loom (M) equipped with a shedding mechanism (7-306) according to one of the preceding claims.
EP03356165A 2002-10-25 2003-10-24 Shedding mechanism and loom with such a mechanism Expired - Lifetime EP1413657B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0213389A FR2846343B1 (en) 2002-10-25 2002-10-25 CROWD FORMATION MECHANISM AND WEAVING MACHINE EQUIPPED WITH SUCH A MECHANISM
FR0213389 2002-10-25

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EP1413657A1 true EP1413657A1 (en) 2004-04-28
EP1413657B1 EP1413657B1 (en) 2009-12-02

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EP (1) EP1413657B1 (en)
JP (1) JP4377199B2 (en)
KR (1) KR101132252B1 (en)
CN (1) CN100336954C (en)
AT (1) ATE450638T1 (en)
DE (1) DE60330301D1 (en)
FR (1) FR2846343B1 (en)
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EP1619279A1 (en) 2004-07-19 2006-01-25 Staubli Lyon Shedding mechanism, three-position shedding mechanism and loom with such a mechanism
EP1852531A1 (en) * 2006-05-03 2007-11-07 Staubli Lyon Mechanism for forming a shed, weaving loom equipped with such a mechanism and method of selecting the mobile needles of such a mechanism
EP3109352A1 (en) 2015-06-22 2016-12-28 Staubli Lyon Blade for moving hooks of a jacquard mechanism and jacquard mechanism comprising such a blade
FR3094725A1 (en) 2019-04-03 2020-10-09 Staubli Lyon Jacquard link and mechanical link comprising such a link
EP4015687A1 (en) 2020-12-21 2022-06-22 Staubli Lyon Mechanism for forming a shed and jacquard loom equipped with such a mechanism
EP4015686A1 (en) 2020-12-21 2022-06-22 Staubli Lyon Mechanism for forming a shed and jacquard loom equipped with such a mechanism

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BE1019154A5 (en) * 2010-01-15 2012-04-03 Wiele Michel Van De Nv SELECTION DEVICE FOR THE GAAPING DEVICE OF A WEAVING MACHINE.
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BE1021951B1 (en) * 2014-07-18 2016-01-28 Michel Van De Wiele Nv GAAP FORMAT FOR A WEAVING MACHINE
RU190338U1 (en) * 2019-02-14 2019-06-26 Дмитрий Владимирович Зайцев THE DEVICE OF MANAGEMENT OF THE MOVEMENTS OF THREADS OF THE ELECTRON JACQUARD MACHINE
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Publication number Priority date Publication date Assignee Title
EP1619279A1 (en) 2004-07-19 2006-01-25 Staubli Lyon Shedding mechanism, three-position shedding mechanism and loom with such a mechanism
EP1852531A1 (en) * 2006-05-03 2007-11-07 Staubli Lyon Mechanism for forming a shed, weaving loom equipped with such a mechanism and method of selecting the mobile needles of such a mechanism
FR2900666A1 (en) * 2006-05-03 2007-11-09 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
US7490633B2 (en) 2006-05-03 2009-02-17 Staubli Lyon Shed-forming mechanism, a loom fitted with such a mechanism, and a method of selecting moving hooks in such a mechanism
EP3109352A1 (en) 2015-06-22 2016-12-28 Staubli Lyon Blade for moving hooks of a jacquard mechanism and jacquard mechanism comprising such a blade
FR3094725A1 (en) 2019-04-03 2020-10-09 Staubli Lyon Jacquard link and mechanical link comprising such a link
EP3722469A1 (en) 2019-04-03 2020-10-14 Staubli Lyon Connecting rod and jacquard mechanism comprising such a connecting rod
EP4015687A1 (en) 2020-12-21 2022-06-22 Staubli Lyon Mechanism for forming a shed and jacquard loom equipped with such a mechanism
EP4015686A1 (en) 2020-12-21 2022-06-22 Staubli Lyon Mechanism for forming a shed and jacquard loom equipped with such a mechanism
FR3118070A1 (en) 2020-12-21 2022-06-24 Staubli Lyon SHEDDING MECHANISM AND JACQUARD-TYPE Loom EQUIPPED WITH SUCH MECHANISM
FR3118069A1 (en) 2020-12-21 2022-06-24 Staubli Lyon SHEDDING MECHANISM AND JACQUARD TYPE Loom
US11702771B2 (en) 2020-12-21 2023-07-18 Staubli Lyon Shedding mechanism and jacquard-type weaving loom equipped with such a mechanism

Also Published As

Publication number Publication date
JP4377199B2 (en) 2009-12-02
US7017618B2 (en) 2006-03-28
DE60330301D1 (en) 2010-01-14
FR2846343A1 (en) 2004-04-30
EP1413657B1 (en) 2009-12-02
US20040079433A1 (en) 2004-04-29
JP2004143660A (en) 2004-05-20
KR101132252B1 (en) 2012-04-02
KR20040036650A (en) 2004-04-30
RU2003131348A (en) 2005-05-20
ATE450638T1 (en) 2009-12-15
CN100336954C (en) 2007-09-12
RU2264486C2 (en) 2005-11-20
CN1498995A (en) 2004-05-26
FR2846343B1 (en) 2004-12-17

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