EP1069219B1 - Selvedge shedding device and weaving loom with such a device - Google Patents

Description

The invention relates to a training device for crowd for the realization of a selvedge and a loom equipped with such a device.

A loom makes it possible to fabricate a fabric on a width that can be important by forming a pattern or weave thanks to an appropriate device, especially a mechanical Jacquard or a dobby. The lateral edges of the current fabric training courses, most often referred to as selvedges, are trained with the fabric and are likely to fray. It is known to use a cam system to control slats specific for side chain wires. he is also known, for example FR-A-2,685,014, to use a mechanical Jacquard specific for the realization of a selvedge on a fabric being woven. Such a Jacquard mechanism is relatively complex and requires its mechanical connection to a main drive shaft, which involves mounting a such shaft remote from a motor shaft of the trade. In addition, a Jacquard mechanics is a relatively elaborate system that is not necessarily adapted to the simplest cases in which a margin with a substantially uniform pattern must be created.

EP-A-0 750 061 proposes a device for carrying out a false border with no gauze that does not allow weaving a true edge because it includes only two smooth associated with a smooth panties, these rails being mounted in cantilevered on a belt and mechanically stressed in permanently. Relatively massive rails should be used, their inertia and rigidity not being compatible with the weaving of a selvedge.

The aim of the invention is to propose a training device for the crowd for a real edge of simple construction, so reliable, and that does not need to be connected to a motor shaft of the craft.

In this spirit, the invention relates to a device for crowd formation for the realization of a selvedge on a Fabric being manufactured on a loom, characterized in that it includes two frames each carrying several smooth and with longitudinal edges and upper edges and lower. These frames are moved, according to a movement alternatively substantially vertical in opposition of phases, by at least one flexible link actuated by an electric motor and connected to their upper or lower edges.

Thanks to the invention, the two smooth frames allow to control the movement of the warp threads of a loom weave in a simple armor movement suited to selvedges and thanks to the electric motor that has to be connected to a control power unit by an electrical connection significantly simpler to install than a drive shaft. The use of heald frames makes it possible to control parallel of the rails in sufficient number for a weaving corresponding to the width of a usual border, the frames to obtain a precise positioning of the smooth, then that they effectively resist the efforts flexible link. In particular, the fact that managers have edges or uprights longitudinal, upper and lower their confers rigidity compatible with the accelerations they undergo and their interaction with classical smooths that can be 50 or 60 for each frame. This link flexible may be a belt, a chain or the like. The electric motor can be easily controlled, so that the movement of the heald frames is out of sync with to that of the main device for training the crowd of craft, be it dobby frames or a harness Jacquard.

• Le lien flexible est formé par un tronçon supérieur reliant des bords supérieurs des cadres de lisses et un tronçon inférieur reliant des bords inférieurs de ces cadres. La division du lien flexible en deux tronçons permet d'utiliser la rigidité des cadres sur une partie de la boucle formée par le lien flexible, ce qui confère une bonne stabilité mécanique d'ensemble au dispositif de l'invention. Dans ce cas, les cadres sont avantageusement reliés aux tronçons supérieur et inférieur sensiblement au centre de leurs bords supérieurs et inférieurs respectifs. Cet aspect de l'invention évite qu'un porte-à-faux ne soit créé au niveau de la jonction entre les cadres et le lien flexible, d'où une stabilité dynamique du dispositif, y compris à haute vitesse.
• Un boítier forme un support pour des poulies de renvoi du lien flexible et pour le moteur. Ce boítier permet de fabriquer un dispositif autonome sur le plan mécanique, ce qui facilite son montage sur un métier à tisser classique. Dans ce cas, le boítier comprend avantageusement au moins une glissière de guidage des cadres dans leur mouvement alternatif, ces cadres étant prévus pour être partiellement engagés dans cette glissière. En outre, des moyens de réglage de la position d'au moins une poulie de renvoi sur le boítier peuvent être prévus, le réglage de cette position permettant le réglage de la tension du lien flexible.
• La position du dispositif est ajustable selon une direction parallèle aux fils de trame du métier, ce qui permet d'adapter simplement la position des cadres de lisses du dispositif à la largeur effective du tissu en cours de fabrication. Avantageusement, le dispositif est monté coulissant sur une poutre du métier disposée parallèlement aux fils de trame, au moins un tirant solidaire du dispositif étant engagé dans une rainure longitudinale de la poutre, ce qui permet d'immobiliser le boítier du dispositif de l'invention dans son mouvement parallèlement aux fils de trame.
• Le lien flexible comprend au moins une courroie crantée apte à être entraínée positivement par une poulie crantée actionnée par le moteur. Cet entraínement positif de la courroie assure un positionnement précis des cadres de lisses.

According to advantageous aspects of the invention, the device incorporates one or more of the following features:

• The flexible link is formed by an upper portion connecting upper edges of the heald frames and a lower section connecting lower edges of these frames. The division of the flexible link into two sections makes it possible to use the rigidity of the frames on a part of the loop formed by the flexible link, which confers good overall mechanical stability to the device of the invention. In this case, the frames are advantageously connected to the upper and lower sections substantially in the center of their respective upper and lower edges. This aspect of the invention avoids that a cantilever is created at the junction between the frames and the flexible link, resulting in dynamic stability of the device, including high speed.
• A housing forms a support for the return pulleys of the flexible link and for the engine. This housing makes it possible to manufacture a device that is mechanically autonomous, which facilitates its assembly on a conventional loom. In this case, the housing advantageously comprises at least one guiding slide frames in their reciprocating movement, these frames being provided to be partially engaged in this slide. In addition, means for adjusting the position of at least one return pulley on the housing can be provided, the setting of this position for adjusting the tension of the flexible link.
• The position of the device is adjustable in a direction parallel to the weft son of the loom, which allows to simply adjust the position of the heald frames of the device to the effective width of the fabric during manufacture. Advantageously, the device is slidably mounted on a beam of the loom disposed parallel to the weft son, at least one tie integral with the device being engaged in a longitudinal groove of the beam, which makes it possible to immobilize the housing of the device of the invention. in its movement parallel to the weft threads.
• The flexible link comprises at least one toothed belt capable of being driven positively by a toothed pulley actuated by the motor. This positive drive of the belt ensures precise positioning of the heald frames.

The invention finally relates to a loom equipped with a least one device as previously described. advantageously, a loom includes a device such as previously described at each edge of the fabric in manufacturing course.

• la figure 1 est une représentation schématique en perspective d'un métier à tisser équipé de deux dispositifs conformes à l'invention ;
• la figure 2 est une vue de face à plus grande échelle du dispositif identifié avec le détail II à la figure 1 et
• la figure 3 est une coupe selon la ligne III-III à la figure 2.

The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of an embodiment of a crowd forming device according to its principle, given only to by way of example and with reference to the appended drawings in which:

• Figure 1 is a schematic perspective view of a loom equipped with two devices according to the invention;
• FIG. 2 is a front view on a larger scale of the device identified with detail II in FIG.
• Figure 3 is a section along the line III-III in Figure 2.

The loom shown in FIG. several heald frames 1 arranged parallel to each other others and carrying smooth 2 whose eyelets 3 are provided to guide chain wires 4.

Each frame 1 is controlled, as shown only for the first frame visible in FIG. 1, by connecting rods 5 integral with return levers 6 interconnected by a transverse link 7. One of the levers 6 is driven by a connecting rod. control 8 whose reciprocating movement in the direction of the arrow F ₁ is controlled by a dobby 9.

The weft son are supposed to be moved, by a conventional mechanism, not shown, perpendicular to the warp son, as represented by the arrow F ₂ .

According to the invention, a beam 10 is disposed above the crowd, that is to say, the crossing zone of the warp son 4 and the weft son, parallel to the direction of the arrow F ₂ . On this beam 10 are suspended two devices 20 and 20 ', similar and in accordance with the invention, the device 20 being more particularly visible in Figures 2 and 3.

The device 20 comprises a housing 21 slidably mounted on the beam 10 by four tie rods 22, the heads 22a are engaged in the concave grooves 10 a and 10 b of the beam 10. When the nuts 22 b associated with the tie rods are not when tightened, the device 20 can slide along the beam 10 in the direction of the arrow F ₃ which is parallel to the arrow F ₂ , while it is immobilized when these nuts 22b are tightened.

The housing 21 supports an electric motor 23 which can be of any known type, but which is advantageously a servomotor.

On the output shaft 24 of the motor 23 is mounted a toothed pulley 25 around which is arranged a toothed belt 26, the two ends 26 a and 26 b are respectively fixed to the respective upper edges 27 a and 28 has two frames smooth 27 and 28. specifically, the end 26a of the belt 26 is fixed on the upper edge 27 a of the frame 27 by four screws 29, while the end 26 b of the belt 26 is fixed to the upper edge the frame 28 by four screws similar to the screws 29. Of course, other fastening means of the belt 26 on the frames 27 and 28 are conceivable. The rotation of the motor 23 positively controls the frames 27 and 28 thanks to the cooperation of the complementary notches of the pulley 25 and the belt 26.

A second belt 30, which may be toothed or not, connects the respective lower edges 27 b and 28 b of the frames 27 and 28 passing around a return pulley 31 disposed in the lower part of the housing 21. respectively denote 30a and 30b the ends of the belt 30 integral with the edges 27b and 28b of the frames 27 and 28 by means of screws 29.

The elements 26, 27, 28 and 30 form a closed loop comprising two rigid parts, 27 and 28, and two parts flexible, 26 and 30.

Thus, the alternating rotation of the pulley 25 alternately drives the frames 27 and 28 in a substantially vertical direction, the movement of the frames being represented by the arrow F ₄ .

Each heald frame 27 or 28 carries a plurality of healds 32 each provided with an eyelet 33 for the passage of the warp threads 4 'located on the left of Figure 1 and intended to form the edge. The mounting of the rails 32 on the frames 27 and 28 can be adapted from known techniques for the assembly of the rails 2 on the main frames 1 of the loom.

The ends 26 a, 26 b, 30 a and 30 b of the belts 26 and 30 are secured to the upper edges, respectively 27a and 28a and lower 27 b and 28 b of the frames 27 and 28 in the central part of the edges of so that there is no overhang between the frames 27 and 28 and the flexible link formed by the belts 26 and 30.

Two pulleys 34 and 35 make it possible to arrange the Vertical strands of belts 26 and 30 in parallel planes relatively close, so that the frames of smooth 27 and 28 move in parallel planes also close. This makes it possible to obtain a great compactness of the device 20.

The pulley 31 is mounted in an oblong slot 36 of housing 21, which allows a tension adjustment of the belts 26 and 30 by displacement of the axis of the pulley 31 in the light 36.

Openings 37 and 38 provided in the sides of the housing 21 form two longitudinal guides in which are respectively engaged the longitudinal edges 27 c, 28 c and 27 d, 28 d frames 27 and 28. Thus, the housing 21 helps guide frames 27 and 28 in their vertical reciprocating movement F ₄ .

Thanks to the invention, the device 20 has a modular structure, compact and rigid that can be installed quickly on a loom with easy adjustment during the delay, by sliding along the beam 10 as shown by the arrow F ₃ . The device of the invention has the particular advantage that it can be installed on looms already in service by the simple addition of a beam equivalent to the beam 10 and two mechanisms 20 and 20 '.

In addition, the control of the servomotor 23 is carried out regardless of the order generated by the loom or the dobby 9, so that a phase shift can be obtained particularly simple way between the background movement of the crowd of executives 1 and the crowd movement of the selvedges, at the level of frames 27 and 28. All training devices cams of conventional cam systems or shafts of system FR-A-2 685 014 can be deleted, so that the assembly and disassembly of devices 20 and 20 'on the trade is significantly easier than in known systems.

According to a not shown variant of the invention, the housing 21 may include two slides on each side, each slide being adapted to receive and guide an edge longitudinal axis of a frame 27 or 28. This makes it possible to obtain a individualized guidance of the frames in translation.

A loom equipped with devices according to the invention and 20 'is easier to control for an operator and more economic investment and cost of operation.

The invention has been shown with the beam 10 arranged above the crowd. However, it is applicable with a beam arranged transversely in the lower part of the loom, that is to say below the crowd, and supporting devices similar to devices 20 and 20 'above it.

The invention has been shown with a loom equipped with a dobby; however, it is applicable to Jacquard type crafts.

Claims (10)

1. A shedding device for producing a selvedge on a fabric being manufactured on a loom, characterised in that it comprises two frames (27, 28) each bearing a plurality of healds (32) and provided with longitudinal edges (27c, 28c, 27d, 28d) and upper (27a, 28a) and lower (27b, 28b) edges, said frames being displaced, in an alternating vertical movement (F₄) in phase opposition, by at least one flexible link (26, 30) actuated by an electric motor (23) and connected to said upper edges or said lower edges.
2. A device according to Claim 1, characterised in that said flexible link is formed by an upper section (26) connecting the upper edges (27a, 28a) of said heald frames (27, 28) and a lower section (30) connecting the lower edges (27b, 28b) of said frames.
3. A device according to Claim 2, characterised in that said frames (27, 28) are connected to said upper and lower sections substantially in the centre of said respective upper (27a, 28a) and lower (27b, 28b) edges.
4. A device according to one of the preceding claims, characterised in that it comprises a casing (21) forming a support for return pulleys (25, 31, 34, 35) of said flexible link (26, 30) and for said motor.
5. A device according to Claim 4, characterised in that said casing (21) comprises at least one slideway (37, 38) for guiding said frames (27, 28) in their alternating movement, said frames being provided to be partially engaged (27c, 27d, 28c, 28d) in said slideway.
6. A device according to one of Claims 4 or 5, characterised in that it comprises means (36) for adjusting the position of at least one return pulley (31) on said casing (21), the adjustment of said position permitting the adjustment of the tension of said flexible link (26, 30).
7. A device according to one of the preceding claims, characterised in that the position of said device (20, 20') is adjustable in a direction (F₃) parallel to the weft threads (F₂) of said loom.
8. A device according to Claim 7, characterised in that said device (20, 20') is mounted to slide (F₃) on a beam (10) of said loom arranged in parallel to said weft threads (F₂), at least one tie-rod (22) integral with said device being engaged in a longitudinal groove (10a, 10b) of said beam.
9. A device according to one of the preceding claims, characterised in that said flexible link comprises at least one notched belt (26) capable of being driven positively by a notched pulley (25) actuated by said motor (23).
10. A loom, characterised in that it is fitted with at least one shedding device (20, 20') according to one of the preceding claims.

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