EP1737775B1 - Method for production of a yarn by the assembly of several staple yarns subjected to a prior transformation and device for carrying out the same - Google Patents

Abstract

A method and apparatus for production of a yarn, by plying, twisting or covering several basic yarns, subjected to a prior transformation, is provided. At least one of the basic yarns is different from the others and/or is subjected to a different prior transformation. The prior transformation may be carried out in parallel in the same machine, by independent transformation members able to be independently controlled. A slackening of yarn tension resulting from the prior transformation to give the desired tension at an assembly point is carried out on yarn feeding devices. Routing of the yarns is achieved by guide members towards the point of assembly, where the staple yarns are combined and arranged in parallel. A bobbin receives the assembled yarns in a device, constituting or associated with a positive feed device operating without slippage with relation to the yarn. The yarn bobbin with assembled yarns is then placed on a spindle of a twisting machine for a second double plying, twisting, or covering process.

Description

The invention; is related to the technical sector of textile yarn processing machines.

More particularly, the invention relates to machines of the type consisting of a plurality of working positions, in particular arranged in juxtaposition. Each of them has different means capable of ensuring the transformation of the wire in one or more steps and then winding or winding.

Mention may be made, for example, of wire processing machines which combine, on the one hand, means for advancing the wires and, on the other hand, wire processing means. The means for advancing the son may be constituted by cylinders cooperating with pressure rollers, capstans, wire guides or other. The son processing means may be based on a rotation conferring on the son, for example, a twist on themselves or a winding son on each other.

The principle is known of these transformations based, on the one hand, on a rotation and conferring a twisting of threads on themselves or a winding of the threads around each other adjusted by the ratio between the speed of rotation of the spindle and the speed of advance of the wire and, on the other hand, the control of tension of the thread. It is recalled here that a process called "simple torsion" confers over a twist on itself by spindle turn, while a so-called "double twist" process confers on the wire two twists on itself by spindle turn

In many cases, the transformation method also provides for treating a plurality of son in parallel, and then assembling these son for subsequent processing or winding. There is therefore an assembly of several son transformed on neighboring positions before passing them together on other means of transformation and / or before returning together.

According to the invention, it appeared important to be able to control this assembly.

In the known processing machines of the type of those defined above, there may be several members intended to advance the threads, some of which may be provided with slip-free drive means and others equipped with means possibly allowing slips. . The relative velocities of these organs make it possible to control the tensions in the threads, to create stretchings, to obtain relaxations or relaxations. Only the speed of drive, without sliding, of the organs, makes it possible to guarantee the speed of advancement of the wire and consequently the regularity of the torsion.

• d'avoir au moins un organe d'avancement des fils sans glissement commun

ou des organes parfaitement synchronisés ;

• que les fils se présentent à cet organe dans une tension parfaitement contrôlée (par exempte des tensions égales) d'un fil à l'autre.

As a result, when assembling multiple wires, so that the assembled wires are of perfectly controlled length (for example identical lengths), it is necessary:

• to have at least one thread advancement member without common slip

or perfectly synchronized organs;

• that the son are presented to this organ in a perfectly controlled voltage (for example equal tensions) from one wire to another.

In wire cabling or twisting machines, it is well known to those skilled in the art to provide a drive device for lowering the tension of the yarn, in the form of, for example, a capstan or a dispenser grid, commonly known as pre-delivery or pre-call. In the remainder of the description, this body will be referred to as the "first ground of appeal". Generally, this member allows a sliding of the wire and turns in overspeed with respect to the advancement of the wire.

The wire is then called into a second member called "call", generally without sliding, ensuring the control of the speed of advance of the wire. Very often, this second call is constituted by the rewinding system itself.

It follows that the tensile force resulting from the tension of the yarns in the upstream processes is, essentially, received by the first means of appeal.

We refer to the figure 1 which shows, as a non-limiting indicative indicative, a son treatment engine having organs capable of making an assembly of several son, according to the state of the art.

It can be seen in this figure that the first means for calling and advancing the wire (2a, 2b, 2c, 2d) are arranged in alignment and rotated by a common shaft, by means of a motor member (4). . It is the same with regard to the means of call and winding (3a, 3b, 3c, 3d) which are arranged in alignment and rotated by a common shaft by means of a motor member (5).

These provisions make it possible to obtain a perfect synchronism between the positions. However, this configuration leads to voltage variations at the output of the first call means, low in absolute value, but significant in relative value. These voltage variations result from the upstream voltage dispersions between the positions, in addition to friction coefficient variations, geometric tolerances of the components of the call system itself. For example, for an upstream voltage ranging from 10 to 12 N, the output conditions can vary from one position to another from 0.3 to 0.6 N.

If such variations do not have significant consequences on the quality of the coil when the wire is wound individually, it is not the same when a son assembly to meet a requirement equi-length.

Indeed, during assembly, such relative voltage variations at the output of the first call means are incompatible with the requirements of length control of assembled son, if the assembly is performed at this location.

• l'implantation des différents moyens (7a, 7b, 7c, 7d), (5) est dans l'environnement immédiat de l'ensemble de traitement du fil amont;
• les organes de guidage sont soumis à de fortes tensions, générant des exigences sévères au regard de la fiabilité ;
• la tension du fil, après l'assemblage, est égale à la somme des tensions de chaque fil, de sorte que le moyen d'appel et de bobinage sur les fils assemblés doit être dimensionné pour supporter cette somme de tension ;
• les fils suivent un trajet long et présentant plusieurs angles sous forte tension qui, par friction interne sur les organes de guidage, provoque une dégradation et affecte la qualité des fils;
• la difficulté, voire l'impossibilité, de procéder à l'assemblage de fils individuels ayant des caractéristiques différentes (titre, nature du fil, nombre ou sens de torsion, ...), du fait des différences de tension qui résultent de ces différences de caractéristiques.

To try to solve this problem, according to the prior art, the assembly is performed upstream of the first call member, since at this point, even if the absolute dispersion is greater, the relative dispersion is much weaker. As a result, as shown in figure 1 , that the means for guiding the wires (7a, 7b, 7c, 7d) from their position working towards the assembly point (5), are arranged before the first means of appeal (2b), which has the following drawbacks:

• the implantation of the various means (7a, 7b, 7c, 7d), (5) is in the immediate environment of the upstream wire processing assembly;
• the guiding members are subjected to high voltages, generating stringent requirements with regard to reliability;
• the tension of the thread, after the assembly, is equal to the sum of the voltages of each wire, so that the means for calling and winding on the assembled wires must be sized to support this sum of voltage;
• the son follow a long path and having several high voltage angles which, by internal friction on the guide members, causes degradation and affects the quality of the son;
• the difficulty, if not the impossibility, of assembling individual wires with different characteristics (title, type of wire, number or direction of twist, ...), because of the differences in tension resulting from these differences of characteristics.

The object of the invention is to overcome these disadvantages in a simple, safe, effective and rational manner and to solve the problem of obtaining perfect control of the assembly process of the wires.

To solve such a problem, it has been conceived and developed a device for managing wire assemblies in textile processing machines for said yarns comprising processing or upstream processing units for the yarn, the first means of appeal and the yarn advancement of the wire, the means of call and / or winding through wire guide, as is apparent, for example, the teaching of the patent EP-A-0 780 333 .

According to the invention, in order to solve the problem posed, the device comprises members capable of producing an assembly of several wires mounted in combination with a plurality of first call and advancement means which are each driven by an individual motor; said assembly members being disposed between said first call means and a call and / or winding means adapted to control the speed of advancement of the combined son.

Whatever the means for driving the call and winding means of the guidewires, separately or in synchronism, each individual motor of the first means of call and advancement is subject to a speed variator .

• soit les moyens d'appel et de bobinage et les guide-fil sont entraînés chacun par un moteur collectif;
• soit les moyens d'appel et de bobinage et les guide-fil sont entraînés chacun par un moteur individuel.

From this basic design:

• either the call and winding means and the wire guides are each driven by a collective motor;
• either the call and winding means and the wire guides are each driven by an individual motor.

According to another embodiment, the wire guides are driven by an individual motor, the call and winding means and the first call and advance means being driven in synchronism by the same motor. realization, the speed ratio between the two means is determined by a system of pulleys.

An improvement of the invention consists in measuring the voltage of each wire by disposing a sensor between the first means of call and advancement of the wire and the assembly point, and by transmitting these voltages to a computer which drives the drives .

In the case where the first means for calling and advancing the wire have no synchronization link with the call and / or winding organs, the computer orders speed adjustments of the first call means for adjust the measured thread tension to a pre-programmed setpoint.

In the case where the wire guides are driven by an individual motor, while the first advancement means and the winding call means are synchronously driven by the same motor, the computer takes as reference the voltage wire corresponding to the position on which the son are towed, and orders speed readjustment of the first call organs of the other positions, for example to equalize the voltages,

From the characteristics underlying the invention, it has appeared that the claimed means and arrangements find an advantageous application for producing a wire, resulting from the assembly by twisting, cabling or wrapping of several basic yarns composed of plurality of elementary wires some of which undergo a prior transformation operation before being assembled and receive a new transformation step, at least one of the elementary son being different or undergoing a transformation different from the others.

• pour la fabrication de cordes, sangles, tissus techniques pour des usages particuliers et présentant des caractéristiques mécaniques ou physiques spécifiques de ténacité, résistance à la traction, élasticité, courbe d'allongement sous charge, etc... ;
• pour la fabrication de tissus, tapis, moquettes, revêtements textiles, présentant des caractéristiques esthétiques, mécaniques ou physiques particulières;
• pour la fabrication de renforts textiles pour des matières composites tel que des élastomères, tel que des fils pour le renfort des pneumatiques, de courroies crantées... les dits fils destinés être insérés individuellement, en nappe ou mis en oeuvre sous formes par exemple de tissus... et devant présenter des caractéristiques mécaniques ou Physiques spécifiques de ténacité, résistance à la traction, élasticité, courbe d'allongement sous charge, etc...

It appears that the development of new textile materials, leads to consider more and more new manufacturing processes for obtaining fIls resulting combination of assembling more and more diversified son. This is particularly the case of son for technical use as, by way of non-limiting examples:

• for the manufacture of ropes, straps, technical fabrics for particular uses and having specific mechanical or physical characteristics of toughness, tensile strength, elasticity, elongation curve under load, etc .;
• for the manufacture of fabrics, carpets, rugs, textile coatings, having particular aesthetic, mechanical or physical characteristics;
• for the manufacture of textile reinforcements for composite materials such as elastomers, such as threads for reinforcement of tires, toothed belts, etc., said yarns intended to be inserted individually, in sheets or in the form of, for example, fabrics ... and having specific mechanical or physical characteristics of toughness, tensile strength, elasticity, elongation curve under load, etc ...

The invention relates more particularly to processes in which the preliminary operations of transformation of the elementary son (s) are twisting methods of simple twisting, double twisting, wiring or wrapping, etc., as is apparent, for example, from the patent teaching US-A-4,200,212 .

Some technical characteristics of the yarns such as tensile strength, elasticity, elongation curve under load, fatigue resistance ... are obtained by the combination of several threads, each undergoing individual treatments, then assembled according to perfectly controlled processes. The elementary wires may be identical or different, and / or undergo identical or different transformations. Depending on your application, the methods may aim to obtain an equi-tonguer and / or equi-tension assembly. In other cases, the assembly process may consist on the contrary assembling wires having different elongation levels or voltages.
In the following will be designated such son resulting from the assembly by twisting or wiring son of different nature, having undergone a different treatment
or powered under different voltages by the term "hybrid wire".

By way of non-limiting example, the patent may be US 6799618 which concerns hybrid son resulting from the assembly of several elementary son which differs in nature and by their prior treatment.

According to the state of the prior art, the hybrid son, composed of several elementary son different in nature and by their prior treatment, such as those set out by way of example in the aforementioned patent, are most often made in two step. Each elementary wire is separately processed in a first step, for example on double twist machines, and is individually received on an intermediate reel. Then, the intermediate coils are taken from a creel feeding a machine that combines the assembly phase and final processing, such as a method of wiring by twisting the assembled son. This final treatment is most often carried out by a twisting method of simple twisting.

• il impose de disposer d'au moins deux types de machines (par exemple une machine double torsion pour la première étape, une machine d'assemblage et simple torsion pour la deuxième étape) ;
• il nécessite la gestion, le stockage et la manipulation de plusieurs lots de bobines intermédiaires ;
• la deuxième étape d'assemblage est le plus souvent réalisée en simple torsion, qui est un procédé produisant à faible vitesse, par exemple sur banc à anneau qui met en oeuvre des bobines en rotation limitées en poids, et nécessitant donc des cavages fréquents. Cette deuxième étape à une productivité relativement faible.
  Il est donc apparu important de proposer des moyens de multiplier les possibilités de combiner des fils individuels différents et de maîtriser le processus d'assemblage, en offrant une grande simplicité de mise en oeuvre et une meilleure productivité.
  Le problème que se propose de résoudre l'invention est d'obtenir un moyen de produire un fil hybride, résultant de l'assemblage par torsion, câblage ou guipage de plusieurs fils de base, ces fils de bases étant identiques ou différents, et étant eux même traités selon des procédés identiques ou différents de torsion ou câblage. L'un des objectifs de l'invention est de contrôler parfaitement la vitesse et / ou la tension des fils au point d'assemblage (lesquelles vitesses et / ou tension sont égales ou différentes).

This method of linking has the following drawbacks:

• it imposes to have at least two types of machines (for example a double twist machine for the first step, an assembly machine and simple twist for the second step);
• it requires the management, storage and handling of several batches of intermediate coils;
• the second assembly step is most often performed in a single twist, which is a process producing at low speed, for example on a ring bench which uses rotation coils limited in weight, and therefore requiring frequent cavages. This second step to a relatively low productivity.
  It has therefore seemed important to propose ways to multiply the possibilities of combining different individual threads and to control the assembly process, by offering a great simplicity of implementation and a better productivity.
  The problem to be solved by the invention is to obtain a means of producing a hybrid yarn, resulting from the assembly by twisting, cabling or wrapping of several basic threads, these threads being identical or different, and being themselves treated by identical or different methods of twisting or wiring. One of the objectives of the invention is to perfectly control the speed and / or voltage of the wires at the point of assembly (which speeds and / or voltage are equal or different).

• l'un au moins des fils de bases est différent des autres et/ou subit une première transformation différente des autres;
• la transformation préalable est réalisée en parallèles dans une machine constituée de moyens de transformation indépendants, équipés de moyens de pilotage et pouvant être réglés individuellement;
• un ajustement de la tension de chaque fil, notamment une détente, depuis ta tension résultant de la première transformation jusqu'à la tension a un point d'assemblage, est réalisée sur des dispositifs d'appel équipes de moyen de réglage et de systèmes de pilotage pouvant être réglés individuellement de telle sorte que la tension au point d'assemblage est ajustée individuellement ;
• l'acheminement des fils est réalisé par des moyens de guidage vers le point d'assemblage où ils sont réunis et disposés parallèlement ;
• une bobine réceptionne les fils assemblés dans un dispositif constituant lui-même ou étant associé avec un moyen d'appel positif, c'est à dire opérant sans glissement par rapport au fil, et apte à contrôler la vitesse d'avancement des fils réunis ;
• la bobine de fils ainsi formée est disposée dans une broche d'une machine de retordage selon un second traitement de double torsion, de câblage ou de guipage, dans laquelle les fils sont liés entre eux par torsion des fils assemblés sur eux-mêmes, par enroulement des fils assemblés autour d'un autre fil, ou par enroulement d'un autre fil autour des fils assemblés.

This results in a process according to which

• at least one of the base wires is different from the others and / or undergoes a first transformation different from the others;
• the prior transformation is performed in parallel in a machine consisting of independent transformation means, equipped with control means and can be individually adjusted;
• an adjustment of the tension of each thread, in particular a trigger, from the tension resulting from the first transformation to the voltage at an assembly point, is performed on call devices sets of control means and control systems that can be adjusted individually so that the voltage at the point of assembly is adjusted individually;
• the routing of the son is achieved by guide means to the assembly point where they are joined and arranged parallel;
• a reel receives the assembled son in a device constituting itself or being associated with a positive call means, ie operating without sliding relative to the wire, and able to control the speed of advancement of the combined son;
• the yarn package thus formed is arranged in a spindle of a twisting machine according to a second double twist, cabling or wrapping treatment, in which the yarns are tied together by twisting the yarns assembled on themselves, by winding the wires assembled around another wire, or by winding another wire around the assembled wires.

Depending on the nature of the hybrid son to produce, the processing of the receiver coil is carried out with different means.

The sequence of these steps can optionally be supplemented by the addition of other complementary operations, which can be performed in parallel or inserted between those above, without changing the sequence of linking thereof.

According to one embodiment, at least one of the basic yarns has a low elongation capacity under load, preferably combined with a high tenacity, and at least one other elementary yarn has an elasticity. and / or a higher load elongation capability, the spun base yarns twisted separately at different twists, then assembled under equal or different stretches, and twisted together.

• la figure 1 est une vue à caractère schématique; d'une machine de transformation équipée d'organes d'assemblage des fils selon l'état antérieur de la technique ;
• la figure 2 montre une machine conforme à celle illustrée à la figure 1, équipée du dispositif de gestion et d'assemblage de fils selon l'invention et dans une forme de réalisation selon laquelle les moyens d'appel et de bobinage et les guide-fil entraînés chacun par un moteur collectif ;
• la figure 3 est une vue semblable à la figure 2 dans laquelle les moyens d'appel et de bobinage et les guide-fil sont entraînés chacun par un moteur individuel ;
• la figure 4 est une vue correspondant à la figure 3 dans laquelle les guide-fil sont entraînés par un moteur individuel, tandis que les moyens d'appel et de bobinage et les premiers moyens d'appel et d'avancement sont entraînés en synchronisme par un même moteur ;
• la figure 5 montre l'application et l'utilisation d'un calculateur et de capteur de tension de fil, appliquées à la forme de réalisation illustrée figure 3, étant observé que cette application peut bien évidemment concerner les formes de réalisation illustrées aux figures 2, 3 et 4 ;
• la figure 6 est une vue à caractère schématique d'un procédé de réalisation d'un fil hybride, ici représenté à titre d'exemple un câblage 3 bouts, selon le procédé objet de l'invention, dans lequel la torsion préalable des fils élémentaires et l'assemblage est réalisée des positions indépendantes de double torsion, et la torsion finale du fil assemblé est réalisée selon le procédé de double torsion;
• la figure 7 est une vue à caractère schématique des moyens de pilotage contrôles de la tension d'assemblage;
• la figure 8 est une vue très schématique représentant le procédé en deux étapes selon l'invention, tel qu'illustré plus en détail sur la figure 6 ;
• la figure 9 est une vue très schématique d'un procédé complet en deux étapes dont la deuxième étape est réalisée par double torsion de trois fils assemblés, chacun de ces fils assemblés étant constitué de deux assemblés par un procédé de câblage direct;
• la figure 10 est une vue très schématique d'un procédé complet en deux étapes dont la deuxième étape est réalisés par câblage direct de deux fils assemblés, chacun de ces fils assemblés étant constitué de trois fils retordus par double torsion ;
• la figure 11 est une vue très schématique d'un procédé complet en deux étapes dont la deuxième étape est réalisée par câblage direct de deux fils assemblés, chacun de ces deux fils assemblés étant constitué de deux fils assemblés par un procédé de câblage direct ;
• la figure 12 est une vue à caractère schématique d'une variante du procédé selon l'invention dans lequel un fil auxiliaire est ajouté dans l'étape de torsion finale par double torsion.

The invention is described below in more detail with reference to the figures of the accompanying drawings, in which:

• the figure 1 is a schematic view; a processing machine equipped with wire assembly members according to the prior art;
• the figure 2 shows a machine conforming to that illustrated in figure 1 equipped with the wire management and assembly device according to the invention and in an embodiment according to which the call and winding means and the wire guides each driven by a collective motor;
• the figure 3 is a view similar to the figure 2 wherein the call and winding means and the wire guides are each driven by an individual motor;
• the figure 4 is a view corresponding to the figure 3 wherein the wire guides are driven by an individual motor, while the call and winding means and the first call and advance means are synchronously driven by the same motor;
• the figure 5 shows the application and use of a calculator and thread tension sensor, applied to the illustrated embodiment figure 3 , being observed that this application can obviously relate to the embodiments illustrated in figures 2 , 3 and 4 ;
• the figure 6 is a schematic view of a method for producing a hybrid wire, here represented by way of example a cabling 3 ends, according to the method object of the invention, wherein the prior twist of the elementary son and the assembly is carried out independent positions of double torsion, and the final twist of the assembled wire is carried out according to the double twist process;
• the figure 7 is a schematic view of control means controlling the assembly tension;
• the figure 8 is a very schematic view showing the two-step process according to the invention, as illustrated in more detail on the figure 6 ;
• the figure 9 is a very schematic view of a complete process in two stages, the second stage is carried out by double twist of three assembled son, each of these assembled son consists of two assembled by a direct wiring method;
• the figure 10 is a very schematic view of a complete process in two stages, the second stage is made by direct wiring of two assembled son, each of these son assembled consisting of three son twisted by double twist;
• the figure 11 is a very schematic view of a complete process in two stages, the second stage is carried out by direct wiring of two assembled son, each of these two assembled son consisting of two son assembled by a direct wiring method;
• the figure 12 is a schematic view of a variant of the method according to the invention wherein an auxiliary wire is added in the final twisting step by double twist.

For a better understanding of the following description, the same references are used according to the different embodiments of the invention.

In a manner well known to a person skilled in the art, the processing machine comprises a plurality of working positions. Each position comprises an upstream wire treatment assembly constituted, for example, by double twist or wiring pins (11a, 11b, 11c, 11d, ...), first call and advance means (2a , 2b, 2c, 2d, ...) of the wire (1a, 1b, 1c, 1d, ...) and call and / or winding means (3a, 3b, 3c, 3d, ...) . via wire guide (6a, 6b, 6c, 6d, ...).

According to the invention, the device comprises members (7a, 7b, 7c, 7d) capable of producing an assembly (A) of several wires, these members being mounted in combination with several of the first means of call and advancement ( 2a, 2b, 2c, ...).

In an important manner, according to the invention, each of the first call and advance means (2a, 2b, 2c, 2d, ...) are driven by an individual motor (8a, 8b, 8c, 8d, ...). The assembly members (7a, 7b, 7c, 7d, ...) are arranged between the first call and advance means (2a, 2b, 2c, ...), and one of the call means and winding (3b) able to control the speed of advancement of the joined son. The connecting members (7a, 7b, 7c, 7d, ...) are therefore arranged downstream of the first call and advance means (2a, 2b, 2c, ...) and upstream of the means calls and winding (3a, 3b, 3c, ...).

It will be observed that the call and / or winding means (3a, 3c) and their corresponding wire guides (6a, 6c) are, in the particular exemplary assembly example, unused, since their respective wires are drifting to the means of appeal (3b) and its corresponding thread guide (6b)

Advantageously, whatever the embodiment ( figure 2 , figure 3 , figure 4 ), each individual motor (8a, 8b, 8c, 8d, ...) of the first call and advancement means (2a, 2b, 2c, 2d, ...) is subject to a variator (15a, 15b, 15c, ...).

In the illustrated embodiment figure 2 , the call and winding means (3a, 3b, 3c, 3d, ...) are driven by a common motor member (5). The wire guides (6a, 6b, 6c, 6d, ...) are driven by a common motor member (6).

In the illustrated embodiment figure 3 , the call and winding means (3a, 3b, 3c, 3d, ...) are each driven by an individual drive member (10a, 10b, 10c, 10d, ...). It is the same for the wire guides (6a, 6b, 6c, 6d, ...) which are each driven by an individual motor (12a, 12b, 12c, 12d, ...).

In this illustrated embodiment figure 4 , the call and winding means (3a, 3b, 3c, 3d, ...) and the first call and advance means (2a, 2b, 2c, 2d, ...) are driven in synchronism by the same motor (8a, 8b, 8c, 8d, ...). The speed ratio between the means (2a, 3a), (2b, 3b), (2c, 3c), (2d, 3d), ...) is fixed for example by a pulley ratio (9).

The drives (15a, 15b, 15c, ...) driving the first call means, are associated with a speed adjusting means in the form, for example, of a local control accessible by an operator.

Or, the drives (15a, 15, b, 15c, ...) are controlled by a computer (14) delivering a setpoint to each drive, said setpoint may for example be programmed by an operator.

As indicated, the device finds a particularly advantageous application, for the production of a hybrid wire resulting from the assembly by twisting, wiring or wrapping of several basic son (1a, 1b, 1c, ...).

• une première transformation (Pa, Pb, Pc...) de tout ou partie des fils élémentaires (Fa, Fb, Fc, ...) par une opération torsion, câblage, guipage... On réalise cette opération sur une broche de retordage ou de câblage ;
• un assemblage, les fils se réunissant parallèlement les uns aux autres au point (A),
• une seconde transformation (S) des fils assemblés, qui est une opération de torsion, câblage ou guipage... On réalise cette opération sur une broche de retordage ou de câblage.

It is recalled, in a manner perfectly known to those skilled in the art, that the transformation process comprises three main operations:

• a first transformation (Pa, Pb, Pc ...) of all or part of the elementary son (Fa, Fb, Fc, ...) by a twist operation, wiring, wrapping ... This operation is performed on a pin of twisting or wiring;
• an assembly, the wires meeting parallel to each other at point (A),
• a second transformation (S) of the assembled son, which is a twisting operation, wiring or wrapping ... This is done on a twisting pin or wiring.

These operations may optionally be preceded upstream, or may be supplemented by other intermediate steps or associated with any one of these three operations, such as rewinding, heat-setting, stretching operations ... without this being necessary. affects the scope of the present application as soon as the three operations mentioned above are regrouped in two stages according to the mode of chaining exposed.

According to an important aspect of the invention, the means (11a, 11b, 11c, ...) make it possible to carry out the first transformation (Pa, Pb, Pc ...) of the basic wires (1a, 1b, 1c,. ..) and are preferably arranged adjacently and comprise individual drive means, each controlled individually by systems such as variable speed drives (16a, 16b, 16c, ...). Each means (11a, 11b, 11c ...) is thus set to perform a transformation (Pa, Pb, Pc ...) specific to each wire, which may be different from the others, for example a twist of value or meaning different. Optionally, some of the son (1a, 1b, 1c, ...) may not be transformed or their transformations can be adjusted to 0 turns, the wire receiving no torsion, only the means of unwinding and / or pretension of the means of transformation; corresponding, being used at the output of the transformation means (11a, 11b, 11c ...), each wire has a voltage that depends on its title and the transformation (eg speed, diameter of the balloon, title of the wire ... ).

Each wire (1a, 1b, 1c, ...) passes through a first call means (2a, 2b, 2c, ...) for adjusting its voltage and in particular to lower the voltage of the wire resulting from the transformation of the wire (Pa, Pb, Pc ...) in the form of, for example, a capstan or a grid-type emitter, generally known as a "pre-emitter" or "pre-call". In the remainder of the description, this body will be referred to as the "first ground of appeal". For example, to achieve a relaxation, this member allows a wire slip and turns in overspeed with respect to the advancement of the wire.

Importantly, each of the first call and advancement means (2a, 2b, 2c, ...) is provided with a means capable of adjusting its efficiency. This means may, for example, consist in adjusting the winding arc of a delivery gate, or the number of winding turns. around a capstan. This adjustment can be done manually or by actuators. This means of individually adjusting the efficiency of the first call means (2a, 2b, 2c, ...) can also consist in adjusting the speed of the delivery member, for example by being controlled by an individual motor (8a , 8b, 8c ...), controlled individually by systems such as variable speed drives (15a, 15b, 15c ...).

Each call and advancement means (2a, 2b, 2c ...) is set to adjust the voltage of each wire to the assembly voltage which may be different from the others. At the output of the means of call and advancement means (2a, 2b, 2c ...), the wire at a voltage which corresponds to that which is to be obtained at the assembly point (A).

The son (2a, 2b, 2c ...) are conveyed to the assembly point (A) by guide members (7a, 7b, 7c, ...)). The members (7a, 7b, 7c, ...) and the point (A) are arranged between the first call and advance means (2a, 2b, 2c ...) and the winding means (3). able to control the speed of advancement of the joined son. Then the son (1a, 1b, 1c) joined in parallel, are called by a winding means which forms an intermediate coil (4).

The coil (4) of single son (1a, 1b, 1c ...) having received the first treatment (Pa, Pb, Pc ...) is then taken up in a second machine to receive the second treatment (S). The assembled wire is twisted in the spindle (17), passes through a call member (18) and is wound by the winding means (19), forming the final coil (20).

Advantageously, whatever the embodiment ( figure 6 and following), each individual motor of the first transformation means (11a, 11b, 11c ...) is subject to a variator (16a, 16b, 16c ...) and each individual motor (8a, 8b, 8c ... ) of call and advancement (2a, 2b, 2c ...), is subject to a drive (15a, 15b, 15c ...). These drives (15a, 15b, 15c ... 16a, 16b, 16c ...) are associated with a speed control means in the form of, for example, a setpoint or local control accessible by an operator .

Or, the drives (15a, 15b, 15c ... 16a, 16b, 16c ...) are controlled by a computer (14) delivering a setpoint to each drive, said setpoint can for example be programmed by an operator.

An improvement of the invention, illustrated on the figure 7 , consists in having means for measuring the voltage of each wire, in the form for example of sensors (13a, 13b, 13c, ...) downstream of the first means of call and advancement (2a, 2b, 2c , ...) and upstream of the assembly point (A) of the wires. The voltage signal of each wire is transmitted to a computer (14) which transmits instructions to the drives (15a, 15b, 15c ...) driving the motors (8a, 8b, 8c, ...) of the first means of call and advancement (2a, 2b, 2c ...).

The computer (14), for example in the form of a central unit, continuously adjusts the speed of the first calls (2a, 2b, 2c ...) to ensure a perfect respect of the voltage of the wires required by the method at point d assembly (A) to compensate for possible drift adjustments over time.

The required voltages, by the assembly method, may be equal voltages between each wire or different voltages from one wire to another.

According to the invention, it is therefore possible to make wire assemblies (1a, 1b, 1c, ...) having different characteristics, each wire being brought to the assembly point (A) under a predetermined voltage controlled by the system. This result is particularly advantageous for the assembly of son having different elasticities.

Note that a means for measuring the tension of each wire can be replaced and / or supplemented by a means able to measure the speed of advance of the wire immediately before the assembly point (A).

The process according to the invention, illustrated by Figures 8 or 9 , is particularly intended for the production of a hybrid yarn for reinforcing tires or composite materials. This method consists in using at least two basic son (1a, 1b, 1c, ...), one of which is different in nature from the others. At least one of the basic yarns has a low elongation capacity under load, and at least one other elementary yarn has a higher elasticity and / or elongation capacity. The base wires are twisted separately at different twists, then assembled under equal or different tensions, and twisted together.

• on retord simultanément et en parallèle tout ou partie des fils élémentaires par un procédé double torsion bu câblage direct (Pa, Pb, Pc,..), dans les broches (11a, 11b, 11c.) de préférence adjacentes d'une machine de retordage ;
• on fait passer chaque fil dans un premier organe délivreur (2a, 2b, 2c...) dont l'efficacité est réglable indépendamment des autres, pour ajuster sa tension à la tension d'assemblage;
• Les, fils sont guidés par les dispositifs de guidage (7a, 7b, 7c, ...) jusqu'au point d'assemblage (A) où ils sont réunis dans une disposition essentiellement parallèle;
• on bobine les fils ainsi assemblés pour former une bobine intermédiaire (4) l'entraîmement des fils se faisant sans glissement ;
• on place la bobine intermédiaire de fils assemblés (4) ainsi formée dans une broche double torsion (17) et on retord les fils assemblés selon le procédé de double torsion conventionnelle (S), les fils assemblés étant liés entre eux par torsion sur eux même.

The production process according to the invention comprises the following steps:

• two or more of the elementary wires are twisted simultaneously and in parallel by a double twist method with direct wiring (Pa, Pb, Pc, ..) in the preferably adjacent pins (11a, 11b, 11c) of a twisting machine;
• each wire is passed through a first delivery member (2a, 2b, 2c ...) whose efficiency is adjustable independently of the others, to adjust its voltage to the assembly voltage;
• The yarns are guided by guiding devices (7a, 7b, 7c, ...) to the point of assembly (A) where they are joined in a substantially parallel arrangement;
• the son thus assembled are reeled to form an intermediate reel (4) the entrainment of the threads being made without slipping;
• the intermediate coil of assembled yarns (4) thus formed is placed in a double twist spindle (17) and the assembled yarns are twisted according to the conventional double twist method (S), the assembled threads being tied together by twisting on themselves .

According to the invention, some of the son (1a, 1b, 1c, ...) may not be transformed or twisted, only the unwinding and pretensioning means of the corresponding transformation means being used.

According to the embodiment of the invention illustrated by the figure 12 an auxiliary wire (21) can be introduced into the assembly.

• ■ assemblé sans transformation préalable au point d'assemblage A, sa tension étant éventuellement ajustée par un tendeur ou tout organe délivreur auxiliaire similaire ;
• ■ introduit dans la broche de double torsion (17) par l'axe creux, pour rejoindre les fils assemblés lors de la première étape à la sortie de la broche (17), de sorte que le fil auxiliaire n'est pas retordu mais est lié par enroulement autour des fils assemblés qui sont retordus ensemble en double torsion (2 torsions par tour de broche).

Depending on the case, it can be

• ■ assembled without prior transformation to the assembly point A, its tension possibly being adjusted by a tensioner or any similar auxiliary delivery member;
• Introduced into the double twist spindle (17) by the hollow shaft, to join the threads assembled during the first step at the exit of the spindle (17), so that the auxiliary thread is not twisted but is bound by winding around the assembled wires which are twisted together in double twist (2 twists per spindle turn).

The auxiliary wire (21) may be a wire having an auxiliary function such as an antistatic wire or gas absorber. It can, itself, be a wire formed by assembling several threads, and / or having undergone prior treatments.

According to the invention, illustrated by the Figures 10 or 11 , is particularly intended for the production of a complex hybrid yarn for reinforcing tires or composite materials. This second embodiment of the method according to the invention is characterized in that it uses at least two basic son (Fa, Fb, Fc, ...), one of which elementary sons has a low elongation ability preferably combined with high toughness, and at least one other elementary yarn has a higher elasticity and / or elongation capacity, the base yarns being twisted separately at different twists and then assembled under equal or different voltages, and connected together by winding with another wire.

The process comprises the same steps as previously defined with the only difference that the intermediate coil (4) is placed in a hollow spindle (10) of wiring or wrapping (17), the assembled son is linked by associating them with another wire (4 '), according to a method of wiring or wrapping.

According to this second embodiment, the other wire (4 ') which is associated with the first wire (4) during the final step is different from the first assembled wire (4), either by its son composition (1'a, 1'b, 1'c), or by the treatment undergone (P'a, P'b, P'c, ...), the two son (4) and (4 ') being united according to the known process known as "direct wiring".

According to this second embodiment, said assembled wire (4) constitutes the core, and the wire (4 ') which is associated during the last step is a link wire surrounding the core wire according to a covering method.

The associated wire (4 ') may be a wire having an auxiliary function such as an antistatic wire or gas absorber. He may himself a wire formed by assembly of several threads, and / or have undergone prior treatments.

According to the invention, in the first transformation (Pa, Pb, Pc ...), the speed of each spindle (11a, 11b, 11c ...) effecting the twisting of the base wires (1a, 1b, 1c,. ..) is adjusted so that the wire (s) of lower elongation capacity receive a greater number of twists per meter than the wire (s) of high elasticity.

• soit dans le même sens que celui des broches effectuant la torsion du (ou des) fils de grande élasticité ;
• soit en sens inverse de celui dés broches effectuant la torsion du (ou des) fils de grande élasticité, par exemple, le(s) fil(s) de plus faible capacité d'allongement sont retordus en « Z » et le(s) fil(s) de plus grande élasticité sont retordus en « S ».

According to the invention, in the first transformation (Pa, Pb, Pc ...), the pins (11a, 11b, 11c ...), effecting the twisting of (or) wire (s) of lower capacitance. elongation turn:

• in the same direction as that of the pins performing the twisting of (or son) high elasticity;
• in the opposite direction to that of the pins performing the twisting of the son (or sons) of high elasticity, for example, the wire (s) of lower capacity elongation are twisted in "Z" and the (s) wire (s) of greater elasticity are twisted in "S".

According to the invention, in the second transformation (S), the final twist of the assembled son is in the opposite direction of the twist of (or son) having the lowest elongation capacity.

According to the invention, in the second transformation (S), the number of twists per meter given during the final twist is less than or equal to the number of twists per meter given during the first transformation to the thread (s). having the lowest capacity for elongation.

The following is a first example of the process according to the invention applied to the production of a thread intended for the production of tapas, consisting of two elementary threads of polypropylene BCF 1240 dtex, twisted at 180 revolutions per meter in Z, and a CF 600 dtex polypropylene yarn twisted at 130 revolutions / meter in S. The three yarns are assembled and twisted together at 160 revolutions / meter in Z.

The two polypropylene yarns BCF (1a, 1b) are twisted in the spindles (11a, 11b), set to rotate at 5500 rpm in Z, and the polypropylene thread CF (1c) is twisted into the spindle (11c) set to turn at 3970 rpm in S.

The winding system (3) winds the assembled threads on a spool (4) at a winding speed of 61.1 m / min, without slippage:

The spool (4) is taken up on a double twist spindle (17) rotating at 3500 rpm, with a calling speed of 43.7 m / min, without slippage.

The following is a second example of the method according to the invention applied to the production of a thread intended to reinforce tires, consisting of two elementary son aramid 1100 dtex, twisted at 510 revolutions per meter Z, and a thread 940 dtex nylon twisted at 350 revolutions / meter Z. The three threads are assembled and twisted together at 350 revolutions / meter in S.

The two aramid wires (1a, 1b) are twisted in the pins (11a, 11b), set to rotate at 7000 rpm in Z, and the nylon thread (1c) is twisted into the spindle (11c) set to rotate to 4800 rpm in Z.

The winding system (3) winds the assembled wires on a coil (4) at a winding speed of 27.45 m / min, without slippage.

The spool (4) is taken up on a double twist spindle (17) rotating at 5250 rpm, with a speed of 30 m / min without sliding.

The preceding examples are given to illustrate the implementation of the method according to the invention and its non-limiting.

• L'implantation des moyens de guidage du fil vers le point d'assemblage, est dans une zone éloignée de la broche et donc plus accessible pour l'opérateur.
• Les organes de guidage (roulettes, guides) sont soumis à des tensions faibles étant donné qu' ils sont situés après le premier appel.
• Les organes pré-délivreur n'ont à supporter que la tension d'un fil.
• Les fils suivent un trajet long et présentent plusieurs angles sous faible tension, ce qui évite la dégradation de leur qualité (résistance à traction, risque de brins cassés, ...).
• Il est possible de procéder à des assemblages de fils, chaque fil pouvant être de nature ou de titre différent et recevoir un premier traitement (en sens de torsion ou nombre de torsion paramètre) différent des autres fils.
• Après cette première transformation, les fils peuvent être amenés au point d'assemblage sous des tensions OH des vitesses prédéterminées différentes des autres.
• Le transfert de la première étape vers la deuxième se fait par une bobine intermédiaire unique qui contient les fils pré assemblés et pré-conditionnés pour obtenir l'équilibre de longueur ou de tension souhaitée.
• Il est possible de réaliser la deuxième transformation par le procédé de double torsion ou de câblage direct, qui procure une productivité optimale.
• On peut envisager une très grande variété de configurations d'assemblage et de réunir un nombre illimité de fils.

The advantages stand out well from the description, in particular one underlines and recalls:

• The implantation of the guide means of the wire to the assembly point, is in a zone remote from the pin and therefore more accessible to the operator.
• The guiding members (casters, guides) are subjected to low voltages since they are located after the first call.
• Pre-delivery devices only have to support the tension of a wire.
• The wires follow a long path and have several angles under low voltage, which avoids the degradation of their quality (tensile strength, risk of broken strands, ...).
• It is possible to assemble threads, each thread may be of a different kind or title and receive a first treatment (in the direction of torsion or number of twist parameter) different from other son.
• After this first transformation, the son can be brought to the assembly point under OH tensions of predetermined speeds different from the others.
• The transfer from the first step to the second is by a single intermediate coil which contains the pre-assembled and preconditioned son to obtain the desired balance of length or tension.
• It is possible to perform the second transformation by the process of double torsion or direct wiring, which provides an optimal productivity.
• A wide variety of assembly configurations can be envisaged and an unlimited number of threads can be assembled.

Claims (20)

1. Method for producing a yarn, resulting from the assembly by twisting, stranding or covering of a plurality of basic yarns (1a, 1b, 1c, ...), undergoing a prior processing (Pa, Pb, Pc, ...), whereby:

   - at least one of the basic yarns (1a, 1b, 1c, ...) is different from the others and/or undergoes a first processing (Pa, Pb, Pc, ...) different from the others;

   - the prior processing (Pa, Pb, Pc, ...) is carried out in parallel in the same machine consisting of a juxtaposition of independent processing means (11a, 11b, 11c, ...), equipped with control means (16a, 16b, 16c, ...) and being adjustable individually;

   - an adjustment of the tension of each yarn (1a, 1b, 1c, ...), in particular a relief from the tension resulting from the first processing to the tension at an assembly point (A) is carried out on feeding devices (2a, 2b, 2c, ...);

   - the yarns (1a, 1b, 1c ...) are conveyed by guide means (7a, 7b, 7c, ...) to the assembly point (A) where they are joined and disposed in parallel;

   - a spool (4) receives the yarns thus assembled in a device (3) itself consisting, or being associated with, a positive feeding means, that is operating without slippage with respect to the yarn, and suitable for controlling the speed of advance of the joined yarns;

   - the spool (4) of yarns thus formed is placed in a spindle (17) of a twisting machine to receive a second double twisting, stranding or covering treatment (S) in which the yarns (1a, 1b, 1c, ...) are bound together by twisting the yarns assembled on themselves, by winding the assembled yarns around another yarn, or by winding another yarn around the assembled yarns.
2. Method according to Claim 1, for producing a hybrid yarn resulting from the assembly by twisting, stranding or covering of a plurality of basic yarns (1a, 1b, 1c, ...), undergoing a prior processing (Pa, Pb, Pc, ...), whereby:

   - at least one of the basic yarns (1a, 1b, 1c, ...) has a low capacity of elongation under load, preferably combined with a high toughness, and whereof at least one other elementary yarn has a higher elasticity and/or capacity for elongation under load, the basic yarns being twisted separately to different torsions, and then assembled under equal or different tensions, and twisted together.
3. Method according to Claims 1 and 2, in which the spool (4) of the assembled yarns thus formed is placed in a hollow spindle for stranding or covering (17), in which the assembled yarns are bound by associating them with another yarn, by a direct stranding or covering method (S).
4. Method according to any one of Claims 1 to 3, characterized in that an adjustment of the tension of each yarn (1a, 1 b, 1c, ...), in particular a relief from the tension resulting from the first processing to the tension at an assembly point (A), is carried out on feeding devices (2a, 2b, 2c, ...) equipped with adjusting means and control systems which can be adjusted individually so that the tension at the assembly point is adjusted individually.
5. Method according to Claim 4, characterized in that the adjusting means of the first feeding devices (2a, 2b, 2c, ...) comprise an actuator or a motorization (8a, 8b, 8c, ...) associated with individual control means (15a, 15b, 15c).
6. Method according to any one of Claims 1 to 5, characterized in that the first processing (Pa, Pb, Pc, ...) of the basic yarns is a double twisting or direct stranding operation.
7. Method according to any one of Claims 1 to 5, characterized in that the first processing (Pa, Pb, Pc, ...) is partly an operation of double twisting, and partly a direct stranding operation for another part of the basic yarns.
8. Method according to any one of Claims 1 to 7, characterized in that some of the yarns do not undergo a processing or in that the processing (Pa, Pb, Pc, ...) of some of the yarns does not confer torsion, the corresponding processing means being set at "0 rpm", the yarns using their reeling and/or pretension means.
9. Device for implementing the method according to any one of Claims 1 to 8 in textile machines for processing the said yarns, comprising units for the upstream treatment or processing of the yarn (11 a, 11b, 11c, 11d, ...), first yarn feeding and advance means (2a, 2b, 2c, 2d, ...), feeding and winding means (3a, 3b, 3c, 3d, ...) by means of a thread guide (6a, 6b, 6c, 6d, ...),
   characterized in that it comprises members (7a, 7b, 7c, 7d, ...) suitable for making an assembly (A) of a plurality of yarns mounted in combination with a plurality of first feeding and advance means (2a, 2b, 2c, ...), which are each controlled by an individual motor (8a, 8b, 8c, ...), the said assembly members (7a, 7b, 7c, 7d, ...) being placed between the said first feeding means (2a, 2b, 2c, ...) and one of the feeding and winding means (3b) suitable for controlling the speed of advance of the joined yarns, each individual motor (8a, 8b, 8c, 8d, ...) of the first feeding and advance means (2a, 2b, 2c, 2d, ...), is subject to a variator (15a, 15b, 15c, ...).
10. Device according to Claim 9, characterized in that each means (11a, 11b, 11c, ...) for first processing (Pa, Pb, Pc, ...) of the yarns, such as a double twisting, stranding, covering spindle, is equipped with individual motorization subject to a speed variator (16a, 16b, 16c, ...) which receives a speed setpoint and/or a rotation direction independently of the adjacent positions.
11. Device according to Claim 10, characterized in that some of the processing means (11a, 11b, 11c, ...) receive a zero speed setpoint, the yarn using its reeling and/or pretension equipment.
12. Device according to Claims 9 to 11, characterized in that each first feeding and advance means (2a, 2b, 2c, ...) such as a grid delivery roll or a capstan, is subject to an individual device for varying its efficiency by adjusting its speed and/or the yarn winding arc on the drive surface, whereof the speed adjustment is obtained by an individual motorization (8a, 8b, 8c, ...) subject to a speed variator (15a, 15b, 15c, ...) which receives a speed setpoint independently of the adjacent positions.
13. Device according to any one of Claims 9 to 13, characterized in that each speed variator (15a, 15b, 15c, ...) controlling the independent individual processing means (11a, 11b, 11c, ...) and/or each speed variator (15a, 15b, 15c, ...) controlling the first independent feeding means (2a, 2b, 2c, ...) receive an individual speed setpoint from a control system or a computer (14).
14. Device according to Claim 9 and either of Claims 13 and 14, characterized in that a representative quantity of the tension of each yarn (1a, 1b, 1c, ...) is measured by a sensor (13a, 13b, 13c, ...), for example between the first feeding means (2a, 2b, 2c, ...) and the assembly point (A), and transmitted to a computer (14) which controls the processing means and/or the feeding means, the said computer (14) orders adjustments to the speed of the first feeding means (2a, 2b, 2c, ...) to adjust the tension of each yarn with regard to a preprogrammed setpoint.
15. Device according to Claim 14, characterized in that a winding tension setpoint is programmed in the computer (14), which orders speed adjustments of the first feeding members (2a, 2b, 2c, ...) to respect this tension setpoint, the said setpoint being the same for each position or different at each position.
16. Device according to any one of Claims 9 to 15, characterized in that the feeding and winding means (3a, 3b, 3c, 3d, ...) and the thread guides (6a, 6b, 6c, 6d, ...) are each driven by a collective motor (5) - (6).
17. Device according to any one of Claims 9 to 15, characterized in that the feeding and winding means (7a, 7b, 7c, 7d, ...) and the thread guides (6a, 6b, 6c, 6d, ...) are each driven by an individual motor (10a, 10b, 10c, 10d, ...) and (12a, 12b, 12c, 12d, ...).
18. Device according to any one of Claims 9 to 14, characterized in that the thread guides (6a, 6b, 6c, 6d, ...) are driven by an individual motor, the feeding and winding means (3a, 3b, 3c, 3d, ...) and the first feeding and advance means (2a, 2b, 2c, 2d, ...) being driven synchronously by the same motor (8a, 8b, 8c, 8d, ...) and in that the speed ratio between the two means is determined by a pulley and belt system (9a, 9b, 9c, ...).
19. Device according to Claim 18, characterized in that the adjustment of the position (2b) to which the yarns are fed after the assembly point (A), is defined to adjust the feeding speed, the other positions being set to adjust the exit tension of the first feeding means (2a, 2c, ...) with regard to the tension of that to which the yarn (1b) is fed, this tension being used as a reference.
20. Device according to Claim 19, characterized in that the computer (14) uses as a reference the tension of the yarn corresponding to the position (3b) to which the yarns are pulled, and orders speed adjustments of the first feeding means of the other positions, so that the tension of each yarn (1a, 1b, 1c, ...), other than that to which the yarns are pulled, is adjusted to be equal to the tension used as a reference or to present a deviation or a programmable proportionality with regard to that used as a reference.

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