EP0551787A1 - Machine for producing wrap yarns - Google Patents

Abstract

This machine comprises a creel (3) for supplying a plurality of yarns (1a, 1b, 1c, 1d) and a lapping assembly (16) comprising essentially two superposed hollow spindles (8a, 8b). The yarns (1a, 1b, 1c, 1d) are intended for forming the core of the lapped yarn and are conveyed to the lapping assembly by means of a plurality of sliding tension regulators (5) arranged at the exit of the supply creel (3), a combining guide (12) for the elementary core yarns being arranged at the entrance of the first lapping spindle (8a). <IMAGE>

Description

The present invention relates to an improvement made to machines for making gimped threads.

The operation of wrapping a thread, known for a very long time in the textile industry, in particular for manufacturing stretchy threads, generally consists, as shown diagrammatically in FIG. 1 appended, of winding in a helix, around a thread (1), forming a core, one or two threads (2a, 2b) called "covering thread" or "wrapping thread", so that the core (1) remains rectilinear, the ) wrapping thread (s) being wound helically around said core. In the case where the core (1) is covered with two covering threads (2a, 2b) as shown in FIG. 1, the direction of twist is generally reversed between the two threads.

Such a technology used for conventional textile applications when the materials used could not withstand torsion or had to be protected, has greatly developed in recent decades to produce so-called "technical" yarns, in particular to produce yarns. textile fabrics or tablecloths used in the reinforcement of plastics, as is apparent in particular from French patent 2,314,958.

• maîtriser l'élasticité, l'allongement d'un fil d'âme,
• isoler ou protéger un fil d'âme,
• faciliter le tissage ou tricotage de fils délicats ou fragiles,
• protéger l'usure des pièces mécaniques sensibles qui peuvent être attaquées par des fils particulièrement coupants ou abrasifs ;
• donner par un enrobant adéquat un aspect "toucher" textile ;
• cumuler les avantages de fils différents ;
• possibilité d'obtenir des fils à composants multiples (en mettant plusieurs fils d'âme et/ou en employant deux composants différents en enrobant) ;
• possibilité d'obtenir des fils à effets (ondées, bouclés..) en modifiant l'embuvage d'un composant... .

The covering technique has many technical advantages and allows in particular to:

• master the elasticity, the elongation of a core thread,
• insulate or protect a core wire,
• facilitate the weaving or knitting of delicate or fragile threads,
• protect the wear of sensitive mechanical parts which can be attacked by particularly sharp or abrasive wires;
• give a suitable coating to a textile "feel"aspect;
• combine the advantages of different yarns;
• possibility of obtaining wires with multiple components (by putting several core wires and / or by using two different components when coating);
• possibility of obtaining effect wires (wavy, curly, etc.) by modifying the misting of a component, etc.

As a result, it is commonly used nowadays to produce very numerous "composite" or "complex" yarns having a structure adapted according to the particular applications for which they may be intended.

• une source d'alimentation d'un fil d'âme pouvant être constitué d'une cantre disposée éventuellement à côté de la machine ;
• une première broche creuse supportant une bobine de fil de liage ou de guipage ;
• une seconde broche creuse, disposée dans le prolongement de la première broche creuse et supportant une seconde bobine de fil de liage ou de guipage ;
• des moyens de renvidage du fil guipé formé.

To date, to produce these threads, as is apparent from numerous documents and in particular from FR-A-735 448, conventional molding and wrapping machines are used, commonly designated by the expression "fancy mill" which, from a in general, consist of a plurality of identical working positions, mounted side by side on a common support frame, each working position comprising the following elements arranged from the bottom up (or vice versa):

• a power source for a core wire which may consist of a creel possibly arranged next to the machine;
• a first hollow spindle supporting a spool of tying or covering thread;
• a second hollow spindle, arranged in the extension of the first hollow spindle and supporting a second spool of binding or covering thread;
• means for winding the wrapped yarn formed.

In such looms, the core wire passes through the two hollow pins and, during its path, the wrapping wire of each coil mounted on each of the hollow pins, forms a balloon which is wound helically around soul thread.

In general, conventional wrapping machines have two hollow spindles fitted with their wrapping of wrapping thread, arranged one above the other, and which can rotate either in the same direction or in the opposite direction. Furthermore, the driving of said spindles can be carried out either by means of a tangential belt system driving all the spindles simultaneously, or by means of individual motors controlling each spindle.

If such machines are suitable for treating conventional textile threads (natural threads, synthetic threads such as polyester, polyamide, etc.), on the other hand, for new materials which are more and more frequently used for threads for technical use such as threads thermostable or with high mechanical performance (such as aramid, glass, ceramic, carbon, etc.), they pose numerous problems by the fact that such wires can be brittle, sensitive to friction. Furthermore, conventional mills only make it difficult to produce complex cores made up of wires which can have very different characteristics, in particular from a title point of view, while it is often sought to combine such different materials according to the applications for which the wires produced are intended.

However, we have found, and this is what is the subject of the present invention, an improvement made to such wrapping machines which makes it possible to solve all of these problems and authorizes the production of complex yarns which can be made of 'a plurality of core threads which may have characteristics different from each other.

• une cantre d'alimentation d'une pluralité de fils,
• disposés en regard de ladite cantre et espacés de cette dernière, et montés sur un bâti support commun, des moyens de guipage proprement dits comprenant essentiellement :
  • . deux broches creuses superposées, disposées dans le prolongement l'une de l'autre et supportant chacune une bobine de fil de guipage (ou de liage) ;
  • . des moyens d'appel du fil guipé formé disposés dans le prolongement de l'axe commun aux broches creuses et ;
  • . des moyens de renvidage du fil formé.

In general, the invention therefore relates to a machine allowing the production of wrapped yarns, said machine essentially consisting of a plurality of identical working positions, placed side by side, each working position comprising:

• a creel supplying a plurality of wires,
• arranged opposite said creel and spaced from the latter, and mounted on a common support frame, wrapping means proper comprising essentially:
  • . two superimposed hollow pins, arranged in the extension of one another and each supporting a spool of covering wire (or tying);
  • . means for calling up the wrapped yarn formed arranged in the extension of the axis common to the hollow pins and;
  • . means for winding the wire formed.

• une pluralité de régulateurs de tension de fils individuels, du type à glissement (sans pincement) sont disposés à la sortie de la cantre d'alimentation en fils d'âme, des éléments de guidage individuels pour chaque fil d'âme étant prévus à la sortie de ces régulateurs de tension ;
• un guide réunisseur pour les fils d'âme élémentaires est disposé à l'entrée de la première broche de guipage ;
• les moyens d'appel du fil guipé formé prévus en aval de la seconde broche de guipage sont constitués par un délivreur positif.

The machine according to the invention is characterized in that:

• a plurality of individual thread tension regulators, of the sliding type (without pinching) are arranged at the outlet of the core wire feeder, individual guide elements for each core thread being provided for the output of these voltage regulators;
• a joining guide for the elementary core threads is arranged at the entrance to the first covering pin;
• the means for calling up the wrapped yarn formed downstream of the second wrapping spindle consist of a positive deliverer.

Furthermore, a wire presence detector is preferably placed on the path of each core wire before they pass inside the voltage regulators.

It should also be noted that in the machine according to the invention, the path of the core threads inside the covering assembly is carried out in a perfectly straight line, the internal diameter of the channel of the hollow covering pins being such that there is no friction against the internal wall.

• la figure 1 illustre comme dit précédemment la structure générale d'un fil guipé ;
• la figure 2 illustre, vu de côté, l'ensemble d'une position de travail d'une machine réalisée conformément à l'invention ;
• la figure 3 est une vue de détail, schématique, en perspective, montrant la manière dont est réalisé l'appel des fils destinés à former l'âme du fil guipé et la manière dont ils sont réunis sur la machine conforme à l'invention.

The invention and the advantages which it brings will however be better understood thanks to the embodiment given below by way of indication but not limitation, and which is illustrated by the appended diagrams in which:

• Figure 1 illustrates as said above the general structure of a wrapped wire;
• FIG. 2 illustrates, seen from the side, the whole of a working position of a machine produced in accordance with the invention;
• Figure 3 is a detail view, schematic, in perspective, showing the manner in which the call is made of the son intended to form the core of the wrapped yarn and the way in which they are joined together on the machine according to the invention.

In the following description, the machine according to the invention will be described for an installation comprising a supply of four elementary wires to constitute the core and a covering assembly mounted on a vertical support frame, but it is obvious that it could be considered to make machines in which two identical working positions would be arranged on either side of a common central support frame, and this symmetrically.

• une source d'alimentation des fils élémentaires (1a,1b,1c,1d) destinés à former l'âme (1) du fil guipé et qui est constituée par une cantre désignée par la référence générale (3) supportant donc dans le cas présent quatre bobines élémentaires (4a,4b,4c,4d) pour les fils destinés à former l'âme ;
• un ensemble de régulateurs de tension (5a,5b,5c,5d..), ensemble désigné par la référence générale (5), dont la structure ressort plus en détail de la figure 3, ces régulateurs de tension étant associés individuellement à chaque fil d'âme élémentaire (1a,1b,1c,1d) ;
• espacé de la cantre (3) précitée, un ensemble de guipage proprement dit, désigné par la référence générale (16) et comportant, montées sur un bâti commun (7), deux broches creuses (8a,8b) supportant chacune une bobine (9a,9b) de fils de liage (2a,2b) ;
• un délivreur d'appel (10) du fil guipé formé disposé en aval des broches de guipage, délivreur suivi de moyens de renvidage conventionnels (11).

If we refer to the attached diagrams and more particularly to FIG. 2, each working position of a machine according to the invention therefore comprises, if we follow the direction of manufacture of the wire:

• a power source for the elementary wires (1a, 1b, 1c, 1d) intended to form the core (1) of the wrapped wire and which is constituted by a creel designated by the general reference (3) therefore supporting in the present case four elementary coils (4a, 4b, 4c, 4d) for the wires intended to form the core;
• a set of voltage regulators (5a, 5b, 5c, 5d ..), assembly designated by the general reference (5), the structure of which emerges in more detail from FIG. 3, these voltage regulators being associated individually with each wire elementary core (1a, 1b, 1c, 1d);
• spaced from the aforementioned creel (3), a covering assembly proper, designated by the general reference (16) and comprising, mounted on a common frame (7), two hollow pins (8a, 8b) each supporting a coil (9a , 9b) of binding threads (2a, 2b);
• a call deliverer (10) of the wrapped yarn formed disposed downstream of the wrapping pins, deliverer followed by conventional winding means (11).

According to the invention, the voltage regulators (5a, 5b, 5c, 5d ..) will be regulators of the type which do not exert pinching on the wires, for example individually adjustable eddy current tensioners. On each side of each regulator (5a, 5b ..), are arranged guide elements (6a, 6b ..) and return constituted by guides or rollers of suitable diameter, for example ceramic. The elementary core wires (1a, 1b, 1c, 1d ..) leaving the tension regulators are brought to the covering station proper (16) in the form of a sheet (see FIG. 3), the strands of which converge towards each other towards a joining guide (12) arranged at the entrance of the first hollow spindle (8a). In the embodiment illustrated in Figure 2, an additional return element (13) is provided downstream of the voltage regulator (5), and the elementary wires converge towards the unifying guide (12) passing under a platform (14) on which can be move the operator.

The guide elements (6a, 6b, 13,12) which the machine according to the invention comprises, are preferably constituted by idle rollers having a relatively large diameter (greater than fifteen millimeters) and whose surface condition is such that it does not affect the quality of the elementary wires (1a, 1b ..).

The covering assembly proper (16) consists of conventional hollow spindles of the individual drive type (motor spindle). The covering of the wire (1) formed by the assembly of the elementary wires (1a, 1b, 1c, 1d) is carried out in a conventional manner during the passage through the hollow pins. The wrapped yarn formed at the outlet of the wrapping assembly (16) is called up by means of a conventional positive delivery device (10) and the formed yarn is returned in (11) also in a conventional manner. The path of the core wire (1) inside the covering assembly (16) is perfectly rectilinear and there is no friction against the walls of the internal conduit that each pin has.

Such a particularly simple type of machine design makes it possible to obtain a large number of different wires, the constituents of which (core and covering) may be of the same nature or of a different nature. Furthermore, such a machine makes it possible to work both conventional threads and technical threads, such as high tenacity threads, thermostable threads, threads with high mechanical performance, conductive threads. By the design of such a machine, it is possible to produce webs (1) made up of wires having very different characteristics from each others and whose titles, mechanical characteristics, can vary within wide limits. As an indication, it has been possible to produce complex wires on such machines, the core (1) of which consists of four different types of wire kept parallel, one being a carbon-based wire (title: 300 tex ), the other an aramid wire (title: 600 tex), the third single-strand stainless steel wire (diameter: 0.08 mm) associated with a fourth polypropylene wire (title: 167 dtex), the core (1 ) thus formed being wrapped by means of two threads of different nature, one based on high tenacity polyester (280 dtex) and the second based on polypropylene (title: 167 dtex).

Of course, many combinations can be made on such a machine without departing from the scope of the invention.

Furthermore, if in the description, the machine according to the invention has been described for an assembly in which the core can comprise four elementary wires and which therefore comprises, for each position, four voltage regulators, it is obvious that the 'It is not outside the scope of the invention to produce machines comprising, for each position, a greater or lesser number of four deliverers.

Claims (4)

Machine for making gimped wires consisting of a plurality of identical positions arranged side by side, each working position comprising: - a creel (3) supplying a plurality of wires (1a, 1b, 1c, 1d), - arranged opposite said creel (3) and spaced from the latter, and mounted on a common support frame (7), wrapping means (16) proper comprising essentially: . two superimposed hollow pins (8a, 8b), arranged in the extension of one another and each supporting a coil (9a, 9b) of covering thread; . means for calling (10) the wrapped yarn formed arranged in the extension of the axis common to the hollow pins (8a, 8b) and; . winding means (11) for the wire formed, characterized in that: - a plurality of tension regulators (5a, 5b, 5c, 5d) of individual wires, of the sliding type are arranged at the outlet of the feeder strip (3) of core wires, individual guide elements ( 13) for each core wire being provided at the output of these voltage regulators; - a joining guide (12) for the elementary core threads is arranged at the entrance to the first covering spindle (8a); - The call means (10) of the wrapped yarn formed provided downstream of the second wrapping pin (8b) are constituted by a positive deliverer. Machine according to claim 1, characterized in that the path of the core wires (1a, 1b, 1c, 1d) inside the covering assembly (16), is produced in a perfectly straight line, the internal diameter of the channel of the hollow covering pins (8a, 8b) being such that there is no friction against the internal wall. Machine according to one of claims 1 and 2, characterized in that guide elements (6a, 6b) consisting of guides or rollers of large diameter (greater than 15 mm), and whose surface condition is such that 'it does not affect the quality of the elementary wires (1a, 1b ..), are arranged on either side of each regulator (5a, 5b ..). Machine according to one of claims 1 to 3, characterized in that the elementary core threads (1a, 1b, 1c, 1d) leaving the tension regulators are brought to the wrapping station proper (16) in the form of a ply whose arms converge towards each other towards the unifying guide (12) disposed at the entrance to the first hollow spindle (8a).

Images