EP0802994B1 - Weaving loom - Google Patents

Abstract

PCT No. PCT/FR95/01529 Sec. 371 Date Jun. 18, 1997 Sec. 102(e) Date Jun. 18, 1997 PCT Filed Nov. 21, 1995 PCT Pub. No. WO96/23093 PCT Pub. Date Aug. 1, 1996A weaving loom for forming a fabric that includes two vertically adjacent modules and a damping member mounted therebetween. The lower module contains a mechanism for unwinding warp yarn, forming the shed and unwinding the fabric. The upper module contains a mechanism for inserting the weft, controlling the reed and feeding the resulting fabric.

Description

The present invention relates to an improvement made to weaving looms to reduce vibrations and resulting noise of the weaving process.

In the following description, the invention will be described for a weaving loom in which the weft is inserted by by means of two clamps, inserted simultaneously inside of the crowd from each side of the loom, one used to bring the wire of weft taken from a reel located on one side of the machine up to the middle of its width where a transfer takes place per second pliers which, when retracted, bring the wire on the side opposite to the side feed, the movements of said clamps inside the crowd being provided by a group commonly designated by the expression "lance or flexible tape".

It is obvious that this is not limiting and that the invention could also be applied to other types of loom using other means than positive clamps to ensure the insertion of the frame.

• d'une part, d'assurer le déroulement de la nappe de fils de chaine, la formation de la foule et le renvidage du tissu réalisé et ;
• d'autre part, d'inserrer le fil de trame lorsque la foule est ouverte et de le tasser contre la dernière duite réalisée par l'intermédiaire d'un peigne porté par un battant.

Making a fabric involves:

• on the one hand, to ensure the unwinding of the web of warp threads, the formation of the crowd and the winding of the fabric produced and;
• on the other hand, to insert the weft thread when the crowd is open and to pack it against the last pick made by means of a comb carried by a leaf.

It is well known that one of the main problems posed by the weaving is that of the vibrations and the sound level that the control and movement of the various elements allowing carry out the above operations.

To date, the only solution proposed to solve this problem, as is apparent from US-A-3,332,646 consists of interposing between the ground and the lower part of the loom frame, damping systems which do not however give whole satisfaction.

Now we have found, and this is what is the subject of the present invention, a simple, effective solution to resolve these vibration and noise problems are satisfactory.

• le module inférieur regroupant les moyens assurant le déroulement de la nappe de fils de chaine, la formation de la foule (ratière, et tirage des cadres) et l'enroulement du tissu ;
• le module supérieur regroupant, quant à lui, les moyens assurant l'insertion de la trame, la commande du battant et l'appel du tissu réalisé.

In general, the weaving loom according to the invention is characterized in that the means allowing the formation of the fabric are grouped in two superimposed modules between which a damping element is interposed:

• the lower module grouping the means ensuring the unwinding of the web of warp threads, the formation of the crowd (dobby, and drawing of the frames) and the winding of the fabric;
• the upper module grouping, meanwhile, the means ensuring the insertion of the frame, the control of the leaf and the call of the fabric produced.

Thanks to such a structure according to which a damping between bodies with oriented displacements differently (vertically and horizontally), we eliminate practically all vibrations and the level is significantly reduced sound.

According to an embodiment according to the invention, the element shock absorber interposed between the two modules, consists for example by a layer of polyurethane having a thickness of approximately 20 mm.

The invention will however be better understood thanks to the example of realization which follows and which is illustrated by the single appended figure which is a schematic perspective view, simplified, of a craft made according to the invention.

Referring to this figure, the loom according to the invention is therefore, like all looms, consists of a beam (1) of threads chain (2), heald frames (3), the number of which depends on the article to be carried out and which make it possible to ensure the formation of the crowd, a system for calling up (5) the fabric (4) formed and a winding roller (6) of said fabric. The command of the warp threads to form the crowd is obtained by any appropriate means such as for example by a dobby not shown ensuring the vertical displacements of the frames (3).

In the illustrated embodiment, the insertion of the weft thread is obtained by means of an assembly comprising two clamps positive (7,8), arranged on each side of the loom and inserted simultaneously inside the crowd, the clamp (7) driving the wire weft and transferring the end of the latter to the clamp (8) in the middle of the crowd through transfer means bringing the weft of the other side of the business.

The compaction of the weft introduced against the last pick of the fabric (4), is produced by means of a comb (12) mounted on a leaf.

All the aforementioned means being conventional means, do not will not be described in detail for simplification purposes.

In accordance with the invention, and in order to reduce the phenomena of vibration and noise caused by the control and movement of aforementioned means for making the fabric, said means are grouped in two superimposed modules, designated respectively by the references general (13) and (14), the lower module (13) grouping the means ensuring the unwinding of the web of warp threads (2), the formation of the crowd (dobby and drawing of heald frames (3)), as well as the winding fabric (6). The upper module (14) is attached to the module lower (13), a damping element (15) being interposed between the base of the upper module (14) and the corresponding bearing surface of the lower module (13).

This upper module (14) groups together means making it possible to ensure the insertion of the weft, the control of the leaf supporting the comb (12) as well as the call (5) of the fabric formed. The control means are protected by casings (16) which can be soundproofed.

The rear part of the loom comprising the beam (1), the wire holder, chain breaker, frame guide (3) and false edges, can be fitted on a removable assembly adaptable to the lower module (13) facilitating article change operations.

Thanks to such a business structure using a link elastic between organs having oriented displacements differently, we get a lowering of the noise level of the loom compared to a similar trade with no element damper.

Claims (2)

1. Weaving loom, characterized in that the means making it possible to form the fabric (4) are grouped in two superposed modules (13,14), between which a damping element (15) is interposed :

   the lower module (13) grouping the means ensuring the unwinding of the lap of warp yarns (2), the formation of the shed and the winding-up (6) of the fabric ;

   the upper module (14) itself grouping the means (7,8) ensuring the insertion of the weft, the control of the lay supporting the reed (12) and the take-up (5) of the fabric produced.
2. Weaving loom according to claim 1, characterised in that the damping element interposed between each module consists, for example, of a layer of polyurethane having a thickness of approximately 20 mm.

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