EP0165188A2 - Method and device for manufacturing regular ply yarns - Google Patents

Abstract

A first wire (1) is first braked by a progressive brake (2), then it undergoes a false twist. A second wire (5) is braked at (6) so that a very regular effort is imposed on it. The two wires (1 and 5) pass through a rotating system (7) comprising two pulleys (9) which are integral and which ensure the identity of the advance of these two wires. Then the composite or cabled wire (10) passes through a system (1) stopping the progression of the twist. Finally the cable (10) arrives at a cutting device (13-15) taking care to provide a large distance (d) between the last point (12) for guiding the wire in the middle of the course of the wire guide (13 ) and this point (12) itself. Manufacture of cables for tires.

Description

It is known that in certain applications, and more particularly in the tire industry, cabled wires are required to have very high tensile strengths. This does not only require the use of high quality textile materials; still it is necessary that the constituent fibers thereof and the elementary son which realize the wired assembly are stressed very regularly by the forces involved. To achieve satisfying this second condition, it is essential that the tensions and twists put in play during the wiring are themselves strictly regular over the entire length of the cable in question. However, practice shows that this is not the case when using the usual wiring devices and in particular those called "direct wiring". As a result, if we consider for example a small area of a pneumatic envelope comprising such cabled wires substantially parallel to each other, the tensions are not evenly distributed between them, nor between their fibers or other elements. , so that some of the wires are already overloaded at least locally when others only undergo an average load much lower than they could bear. This limits the average load in the area considered and therefore requires the use of larger, more expensive and heavier cabled wires.

Particular wiring heads have already been proposed thanks to which the regularity of the product obtained is improved. However, the results we have seen so far are by no means decisive.

The invention aims to improve devices of the kind in question.

• 1° - On prélève à partir d'une réserve non tournante (bobine fixe, cantre) un premier fil substantiellement sans torsion importante et on le fait passer dans un dispositif de freinage progressif de manière à réaliser la parallélisation de ses brins constitutifs et la répartition régulière de la tension entre ceux-ci.
• 2° - On impartit à ce premier fil une fausse torsion en lui faisant traverser radialement le plateau de base d'une broche tournante portant la bobine de réserve d'un second fil.
• 3° - On fait comporter à la broche un dispositif de freinage de ce second fil, ledit dispositif étant prévu de façon à assurer une très grande régularité de l'effort qu'il impose au fil correspondant.
• 4°- On fait passer les deux fils dans un système tournant co-axial à la broche et comprenant deux poulies sur lesquelles ces fils s'enroulent au passage de façon à assurer l'identité de leurs avances, ce système étant entraîné par la réaction même des fils.
• 5° - On fait passer le fil composite ainsi obtenu par enroulement du premier et du second fil l'un sur l'autre à travers un système propre à arrêter la progression de la torsion, tel par exemple qu'un ensemble de poulies sur lesquelles ce fil s'enroule au passage.
• 6° - On amène enfin le fil composite précité, ou fil composite câblé, à un dispositif de bobinage à vitesse linéaire constante avec guide-fil mobile répartiteur des spires sur la longueur de la bobine, mais en ayant soin de prévoir, éventuellement à l'aide d'un renvoi, une grande distance entre le dernier point de guidage du fil et le guide-fil répartiteur qui assure le bobinage.

In accordance with the invention, the procedure is as follows:

• 1 ° - We take from a non-rotating reserve (fixed spool, creel) a first wire substantially without significant twist and we pass it through a device progressive braking so as to achieve the parallelization of its constituent strands and the regular distribution of the tension between them.
• 2 ° - This first wire is imparted a false twist by making it radially cross the base plate of a rotating spindle carrying the reserve coil of a second wire.
• 3 ° - A braking device of this second wire is made to comprise the spindle, said device being provided so as to ensure a very great regularity of the force which it imposes on the corresponding wire.
• 4 ° - The two wires are passed through a rotating system coaxial with the spindle and comprising two pulleys on which these wires are wound in passing so as to ensure the identity of their advances, this system being driven by the reaction even sons.
• 5 ° - the composite yarn thus obtained is passed by winding the first and second yarn one over the other through a system capable of stopping the progression of torsion, such as for example a set of pulleys on which this wire is wound in the passage.
• 6 ° - Finally, the abovementioned composite wire, or cabled composite wire, is brought to a winding device at constant linear speed with a movable wire guide distributing the turns along the length of the coil, but taking care to plan, possibly at the 'using a return, a large distance between the last guide point of the wire and the distributor wire guide which ensures the winding.

It should be noted that all of the elements used by the invention are known in themselves, but that they had never been used in the manner described above.

• La figure unique de ce dessin montre schématiquement une installation propre à la mise en oeuvre de l'invention.

The attached drawing, given by way of example, will allow better understand the invention, the characteristics it presents and the advantages it is likely to provide:

• The single figure of this drawing schematically shows an installation specific to the implementation of the invention.

We have indicated in 1 a first wire coming from a fixed reserve such as a non-rotating coil, a creel, etc. The wire 1 is substantially untwisted or at least at reduced torsion, that is to say that it is made of parallel strands not tightened against each other.

It is made to pass through a first braking device 2 made of multiple successive elements, so as to ensure the parallelization of the strands and the regular distribution between them of the tension resulting from braking. The regularized wire which leaves the device 2 arrives at the lower end of a hollow spindle 3. It enters the latter, but leaves it almost immediately through a channel pierced radially in the plate 3a of the spindle. Due to the rotation thereof, it undergoes a false twist and it forms a rotating ball which surrounds the bowl 3b of the spindle.

This bowl 3b contains a coil 4 which carries a second wire 5. At the end of the coil 4, this wire 5 passes through a second braking device 6 carried by the cover 3c of the bowl 3b and arranged so as to ensure a braking force extremely regular. One can more particularly util.iser for this purpose a magnetic wire brake in which said wire 5 is interlocked several times in order to achieve a more perfect regularity.

The two wires 1 and 5 arrive at a rotating device 7 carried in rotation by an upper bearing 8 mounted in the axis of the spindle 3. This device comprises two pulleys 9 arranged along the same axis transverse to that of the spindle 3 and angularly in solidarity with each other. The son are wound on the passage thereon, then exit together through the bore of the axis of the device 7. The presence of the pulleys 9 ensures that the advances or flows of the two son 1 and 5 are always equal.

The composite yarn 10 produced by the assembly of the two elementary yarns 1 and 5 then arrives at a device 11 suitable for preventing the twist from going up further. This device 11 can be constituted by a system with two or more pulleys on which the wire is wound when passing a large angle.

Leaving the device 11, the wire 10 passes over a pulley or detour wire guide 12 which returns it to the reciprocating wire guide 13 suitable for ensuring the regular formation of the coil 14 which constitutes the desired final product , this coil resting on a drive drum 15 and being held by one or two arms such as 16.

Of course, the pulley or fixed wire guide 12 is arranged in the plane passing through the midpoint of the stroke of the movable wire guide 13, but furthermore the distance d which separates this pulley 12 from the aforementioned central point is also provided. as dimensions allow, so that variations in the length of the part of the wire 10 between said pulley and the movable wire guide 13, and which result from the displacement of the latter on either side of the aforementioned central point, are as low as possible and have practically no influence on the tension of the wire wound on the spool.

It will be understood that all of the above-described arrangements ultimately make it possible to obtain a cable of extremely regular constitution in which any possible tension is distributed very regularly between the various strands and which consequently has a tensile strength practically equal to the sum. of those. ,,

Claims (3)

1. Method for the direct production of a high resistance cabled wire, characterized in that it comprises in combination the following operating phases, at least some of which are known in themselves: 1. A first wire (1) without significant twisting is passed through a first progressive braking device (2) with multiple successive elements so as to parallelize its constituent strands and to distribute the tension evenly between them. 2 ° This first wire is imparted a false twist by making it radially cross the plate (3a) of a rotating spindle (3) carrying the spool (4) for reserving a second wire (5). 3 ° The spindle (3) is made to include a device (6) for braking this second wire (5), said device being provided so as to impose on the wire (5) an extremely regular force. 4. The two wires (1, 5) are passed through a rotating system (7) co-axial with the spindle (3) and comprising two pulleys (9) angularly integral with one another on which these wires are 'wind in passing, so as to ensure the identity of their advances, this system being driven by the reaction of the son. 5 ° passing the composite wire (10) thus obtained by winding the first and second wire one over the other through a system (11) capable of stopping the progression of torsion, such as for example a set of pulleys on which this wire is wound in passing. 6. Finally, the above-mentioned composite wire, or cabled wire (10), is brought to a constant speed winding device (13-15) with a movable wire guide (13) distributor. turns along the length of the coil (14), but taking care to provide a large distance (d) between on the one hand the last point (12) for guiding the wire, substantially located in the transverse plane passing through the middle of the travel of the movable wire guide (13) and on the other hand this point (12) itself. 2. Method according to claim 1, characterized in that a wire guide or detour pulley (12) is provided between the system (11) for torsion stop and the mobile wire guide (13) distributing the turns on the coil (14). 3. Device for the direct wiring of a wire, characterized in that it is established for the implementation of the method according to any one of the preceding claims.

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