EP0900171A1 - Yarn tensioning device and textile machine equipped therewith - Google Patents

Yarn tensioning device and textile machine equipped therewith

Info

Publication number
EP0900171A1
EP0900171A1 EP97914358A EP97914358A EP0900171A1 EP 0900171 A1 EP0900171 A1 EP 0900171A1 EP 97914358 A EP97914358 A EP 97914358A EP 97914358 A EP97914358 A EP 97914358A EP 0900171 A1 EP0900171 A1 EP 0900171A1
Authority
EP
European Patent Office
Prior art keywords
pulley
magnets
axis
crown
spacing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97914358A
Other languages
German (de)
French (fr)
Other versions
EP0900171B1 (en
Inventor
Carlos Matas Gabalda
Bernard Puaux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ICBT Yarn SA
Original Assignee
ICBT Valence SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ICBT Valence SA filed Critical ICBT Valence SA
Publication of EP0900171A1 publication Critical patent/EP0900171A1/en
Application granted granted Critical
Publication of EP0900171B1 publication Critical patent/EP0900171B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
    • D02G3/28—Doubled, plied, or cabled threads
    • D02G3/285—Doubled, plied, or cabled threads one yarn running over the feeding spool of another yarn
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/16—Braked elements rotated by material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a new type of thread tensioner usable on any type of textile material, and more particularly on machines making it possible to twist and / or twist threads of any kind.
  • tensioning devices which comprise on the one hand, a pulley whose periphery has a friction layer and is in contact with the wire on at least part of its circumference, and on the other hand, means for braking said pulley.
  • These pulley braking means consist of an eddy current brake in the form of an asynchronous type motor, the rotor of which is integral with the pulley shaft and the stator windings of which are supplied by a source. adjustable direct current.
  • Such a type of tensioner which, in general, corresponds to the device which is the subject of US-A-3 797 775, is not satisfactory, in particular by the fact that it requires a supply of electric current and that it is therefore necessary to have as many supply connections as there are tensioning devices.
  • the aforementioned FR-A-2 145 056 aims to overcome this drawback, the braking device which it describes being constituted by an electric generator whose rotor is secured to the pulley shaft, and whose armature is connected to a load resistor, the magnetic field of the generator being supplied by a permanent magnet.
  • FR-A-2 167 957 describes a solution in which braking for guiding the wire is obtained by producing a magnet the number of magnetic poles of which is even, this magnet being placed opposite a disc the face of which is pierced several holes, disc which supports the wire guide pulley. Braking of the pulley is obtained by varying the distance between the disc and the magnet.
  • the invention will be described for a tensioner used on a wiring machine, and in which the element communicating the tension, element which will be designated in the following description by the expression "pulley”, consists of two cups mounted on a hub and locked against each other with a nut to adjust the pressure between the cups and therefore to drive the wire positively. It is obvious that any other equivalent device could be used, for example, it would be possible to produce a tensioner according to the invention by passing the wire against the periphery of a drum or a simple pulley with groove.
  • the wire tensioning device according to the invention is of the type comprising:
  • the device according to the invention is characterized in that the means for adjusting the spacing between the magnets and the pulley to be braked, consist of:
  • a first assembly exerting a push tending to bring the support of the lovers of the crown associated with the pulley up to a predetermined minimum value
  • a second assembly exerting a counter-thrust, of adjustable value, tending to separate the magnets relative to the surface of the crown
  • said counter-thrust means being constituted by a source of compressed air acting on the face of a piston mounted fixed on the axis, pressing against a bearing surface of the latter, and the other side of which is subjected to the action of the first thrust means, the supply of compressed air being carried out simultaneously on all the tensioners that the machine comprises via a common pneumatic line.
  • FIG. 1 is an overview of a textile machine for making the wiring of two elementary son equipped with a tensioner according to the invention
  • FIG. 2 is a detail view in longitudinal section of a tensioner produced in accordance with the invention.
  • FIG. 3 is a front view of such a tensioner showing the way in which the passage of the wire takes place around the "pulley" for communicating the tension;
  • FIG. 4 illustrates, top view, a plurality of tensioners equipping four positions of a textile machine, connected to a source of air supply under common pressure.
  • FIG. 1 illustrates, schematically and seen from the side, a working position of a textile machine known as a "direct cable maker", making it possible to assemble two elementary threads by false twist.
  • each working position therefore makes it possible to join together by twist two elementary wires (A, B) coming from two power sources (1,2).
  • the wire (A) from the spool (1) passes through a turntable (3) or the like so as to form a balloon (4) inside which is placed the power source (2) for the wire ( B).
  • the assembly of the two wires (A) and (B) is obtained by twisting at the meeting point (5), then the cable (6) formed is returned in a conventional manner, for example on a winding system (7) not communicating no additional twist.
  • the call of the two wires (A) and (B) constituting the cable (6) is given by the winding speed in (7).
  • tensioning systems (8,9) are provided for each wires (A, B).
  • the tensioner (8) makes it possible to adjust the reserve length of the wire (A) around the plate (3) and acts as a shock absorber which absorbs the unwinding of the reel from the spool (1), which makes it possible to keep a ball
  • the tensioner according to the invention is particularly suitable for being used to give tension to the wire (A) which passes inside the rotary plate (3) and forms the balloon (4).
  • the stranding machine equipped with tensioners (8) therefore consists of a plurality of identical working positions arranged side by side, the tensioners (8) making it possible to ensure the tension of the wire (A) coming from the support ( 1) carried by a creel arranged, in this case, on the upper part of the machine, are individually mounted on a support plate (35) carried by said frame.
  • the positioning of these tensioners is advantageously located on the machine frame at the level of the winding system, in front of the latter, the wire (B) being brought directly to the brake (9) located upstream of the wiring point (6) in the extension of the axis of the power source (2) of the wire (B).
  • the tensioner (8) comprises, as an element allowing the tension to be communicated to the thread, a pulley made up of two cups ( 11,12) between which the wire (A) passes, these cups being mounted on a hub (13) which is itself mounted free to rotate by means of bearings (14) at the end of a shaft ( 15). Said cups (11,12) are locked on the hub by means of a nut-shaped assembly (16), which makes it possible to adjust the pressure of the cups against each other and consequently the tension that they communicate with the wire.
  • the wire (A) passes through space between the two cups and is maintained at their interpenetration zone, the wire envelope around said cups being determined by two guides (17,39) (shown only in Figure 3), arranged respectively upstream and in downstream of the support plan.
  • the hub (13) which supports the pulley comprises on its face opposite to said pulleys, a crown (18) made of a ferro-magnetic material such as for example based on ferrite.
  • the means for ensuring the braking of the pulley are constituted by a plurality of permanent magnets (19) two in number in the present case, and being in the form of pellets having a diameter of 15 mm. These magnets are mounted concentrically with the shaft (15) on a support (20), itself immobilized inside a housing (21). The support (20) is blocked by means of screws (22), is immobilized in rotation relative to the shaft (15), but is however free in translation relative to the latter.
  • the tensioner comprises means making it possible to vary the spacing between the magnets (19) and the crown (18) carried by the pulley, this variation being between a minimum value of 1 mm, which allows avoid any risk of interference due to geometric faults and a maximum spacing, depending on the power of the magnets, which in this case is 4 mm.
  • These means for ensuring the adjustment firstly comprise a first thrust assembly which tends to bring the support (20) of the magnets (19) of the crown.
  • This displacement is limited by a predetermined minimum value and is obtained, in the present case, by a assembly in the form of a spring (23) disposed around the shaft (15) and bearing, on the one hand on a fixed annular bearing (24) integral with the housing (21) and, on the other hand, on the rear face a piston (32) integral with the shaft (15), which allows the housing (21) to slide relative to the assembly (32-15).
  • the housing (21) is designed so as to have on its rear face (33) a shoulder (34), which therefore makes it possible to produce a chamber (25) between the bottom of the housing and the face (26) of the piston, the other face of the piston bearing against a shoulder provided on the shaft (15).
  • Seals (30) and (31) are provided to seal the chamber (25). Inside this chamber (25), opens the arrival (36) of a compressed air supply.
  • the shaft (15) is fixedly mounted on a support (35) integral with the machine frame.
  • the various elements of the tensioner are represented in their position where the magnets (19) are at a predetermined minimum distance, namely in the present case of the order of one millimeter, from the crown ( 18) mounted on the hub (13) in the pulley (P). This position provides maximum tension on the wire.
  • the chamber (25) When it is desired to modify the value of the tension, the chamber (25) is supplied with compressed air, which therefore tends to push back the piston (32) which exerts a counter-thrust on the spring (23), and therefore tends to move the housing (21) which carries the magnets relative to the shaft (15), in the direction going to the left if we consider Figure 2, which will increase the spacing between said magnets and the crown (18). Consequently, the braking performed by the magnets tends to decrease.
  • the displacement of the magnets relative to the pulley is obtained by displacement of the housing which supports the magnets on the shaft which is kept fixed on the machine. It could be envisaged to proceed in reverse, that is to say to mount the fixed housing on the machine, which will then cause the displacement of the pulley relative to said housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

This invention features a yarn tensioning device comprising a freely rotatable pulley (P) mounted at the end of a spindle (5), the yarn engaging the surface of the pulley. This pulley is associated with a braking system constituted by permanent magnets (19) that can be moved away or towards said pulley. The control of the spacing is provided by a first set (23, 24) which exerts a thrust aimed at bringing the magnet support (20) towards the ring (18) associated with the pulley (P); a second set (25, 32) exerting a counter-thrust aimed at spacing the magnets (19). This counter-thrust is obtained by compressed air, the supply of which is provided simultaneously on all the yarn tensioning devices of the machine through a pneumatic feeder line.

Description

DISPOSITIF TENDEUR DE FIL ET MATERIEL TEXTILE EQUIPE D'UN TEL DISPOSITIF.YARN TENSIONING DEVICE AND TEXTILE MATERIAL EQUIPPED WITH SUCH A DEVICE.
La présente invention concerne un nouveau type de tendeur de fil utilisable sur tout type de matériel textile, et plus particulièrement sur les machines permettant de tordre et/ou assembler par torsion des fils de nature quelconque.The present invention relates to a new type of thread tensioner usable on any type of textile material, and more particularly on machines making it possible to twist and / or twist threads of any kind.
Lors des différentes opérations de transformation que subit un fil au cours de son élaboration, il est indispensable de lui communiquer une tension aussi régulière et constante que possible. Pour ce faire, de très nombreuses solutions de dispositifs tendeurs ont été proposées à ce jour, les plus simples consistant à faire simplement embarrer le fil sur des éléments de renvoi constitués par exemple par deux disques plaqués l'un contre l'autre et soumis à l'action d'un ressort.During the various transformation operations that a thread undergoes during its elaboration, it is essential to communicate to it a tension as regular and constant as possible. To do this, numerous solutions for tensioning devices have been proposed to date, the simplest consisting of simply making the wire embarrassed on return elements constituted for example by two discs pressed against each other and subjected to the action of a spring.
Ces solutions ne permettant pas de contrôler de manière précise la tension que l'on communique, diverses propositions ont été faites pour résoudre ces problèmes.These solutions do not allow precise control of the voltage that is communicated, various proposals have been made to solve these problems.
Ainsi, comme cela est mentionné dans le préambule du FR-A-2 145 056, il a été proposé d'utiliser des dispositifs tendeurs qui comportent d'une part, une poulie dont le pourtour présente une couche de friction et est en contact avec le fil sur au moins une partie de sa circonférence, et d'autre part, des moyens pour freiner ladite poulie. Ces moyens de freinage de poulie sont constitués par un frein à courant de Foucault se présentant sous la forme d'un moteur de type asynchrone dont le rotor est solidaire de l'arbre de la poulie et dont les enroulements du stator sont alimentés par une source de courant continu réglable. Un tel type de tendeur qui, d'une manière générale, correspond au dispositif faisant l'objet de l'US-A-3 797 775, ne donne pas satisfaction, notamment par le fait qu'il nécessite une alimentation en courant électrique et qu'il est donc nécessaire d'avoir autant de branchements d'alimentation qu'il y a de dispositifs tendeurs.Thus, as mentioned in the preamble of FR-A-2 145 056, it has been proposed to use tensioning devices which comprise on the one hand, a pulley whose periphery has a friction layer and is in contact with the wire on at least part of its circumference, and on the other hand, means for braking said pulley. These pulley braking means consist of an eddy current brake in the form of an asynchronous type motor, the rotor of which is integral with the pulley shaft and the stator windings of which are supplied by a source. adjustable direct current. Such a type of tensioner which, in general, corresponds to the device which is the subject of US-A-3 797 775, is not satisfactory, in particular by the fact that it requires a supply of electric current and that it is therefore necessary to have as many supply connections as there are tensioning devices.
Le FR-A-2 145 056 précité vise à surmonter cet inconvénient, le dispositif de freinage qu'il décrit étant constitué par un générateur électrique dont le rotor est solidaire de l'arbre de la poulie, et dont l'induit est connecté à une résistance de charge, le champ magnétique du générateur étant fourni par un aimant permanent.The aforementioned FR-A-2 145 056 aims to overcome this drawback, the braking device which it describes being constituted by an electric generator whose rotor is secured to the pulley shaft, and whose armature is connected to a load resistor, the magnetic field of the generator being supplied by a permanent magnet.
La solution décrite dans ce document permet également de pouvoir assurer de manière simultanée le réglage de la tension communiquée par une pluralité de tendeurs. Elle présente cependant comme inconvénients d'être coûteuse et surtout demande une très grande précision dans sa construction.The solution described in this document also makes it possible to simultaneously ensure the adjustment of the voltage communicated by a plurality of tensioners. However, it has the disadvantages of being expensive and above all requires very high precision in its construction.
Le FR-A-2 167 957 décrit une solution dans laquelle le freinage pour le guidage du fil est obtenu en réalisant un aimant dont le nombre de pôles magnétiques est pair, cet aimant étant disposé en regard d'un disque dont la face est percée de plusieurs trous, disque qui supporte la poulie de guidage du fil. Le freinage de la poulie est obtenue en faisant varier la distance entre le disque et l'aimant.FR-A-2 167 957 describes a solution in which braking for guiding the wire is obtained by producing a magnet the number of magnetic poles of which is even, this magnet being placed opposite a disc the face of which is pierced several holes, disc which supports the wire guide pulley. Braking of the pulley is obtained by varying the distance between the disc and the magnet.
Cette dernière solution, si elle permet d'éviter le problème des branchements électriques, ne permet cependant nullement d'envisager de commander simultanément l'ensemble des tendeurs que peut comporter une machine textile ayant une multiplicité de positions de travail identiques disposées côte à côte. 97/38932 Λ PC17FR97/00395The latter solution, if it makes it possible to avoid the problem of electrical connections, however does not in any way make it possible to envisage simultaneously controlling all of the tensioners that a textile machine may have having a multiplicity of identical working positions arranged side by side. 97/38932 Λ PC17FR97 / 00395
Or on a trouvé, et c'est ce qui fait l'objet de la présente invention, un nouveau type de dispositif tendeur qui surmonte les inconvénients des solutions antérieures et qui, non seulement, permet d'éviter une alimentation en courant électrique, mais également assure une mise en tension progressive lors du lancement de la machine, tension qui demeure constante en fonctionnement normal. Par ailleurs, le réglage de tout ou partie des dispositifs tendeurs que peut comporter la machine lorsqu'elle est constituée d'une pluralité de positions de travail identiques, peut être effectué simultanément sur l'ensemble des délivreurs qui remplissent la même fonction. Enfin, le dispositif conforme à l'invention permet d'obtenir uen très grande plage dans les tensions susceptibles d'être communiquées au fil et est utilisable pour des fils pouvant présenter des caractéristiques très différentes les unes des autres.However, we have found, and this is the subject of the present invention, a new type of tensioning device which overcomes the drawbacks of the previous solutions and which not only makes it possible to avoid a supply of electric current, but also ensures progressive tensioning when the machine is launched, a voltage which remains constant in normal operation. Furthermore, the adjustment of all or part of the tensioning devices which the machine may include when it is made up of a plurality of identical working positions, can be carried out simultaneously on all of the deliverers which fulfill the same function. Finally, the device according to the invention makes it possible to obtain a very large range in the voltages liable to be communicated to the wire and can be used for wires which may have characteristics which are very different from each other.
Dans la suite de la description, l'invention sera décrite pour un tendeur utilisé sur une machine de câblage, et dans lequel l'élément communiquant la tension, élément qui sera désigné dans la suite de la description par l'expression "poulie", est constitué de deux coupelles montées sur un moyeu et bloquées l'une contre l'autre à l'aide d'un écrou permettant de régler la pression entre les coupelles et donc d'entraîner le fil de façon positive. Il est évident que tout autre dispositif équivalent pourrait être utilisé, par exemple, il serait possible de réaliser un tendeur conforme à l'invention en faisant passer le fil contre la périphérie d'un tambour ou d'une simple poulie à gorge.In the following description, the invention will be described for a tensioner used on a wiring machine, and in which the element communicating the tension, element which will be designated in the following description by the expression "pulley", consists of two cups mounted on a hub and locked against each other with a nut to adjust the pressure between the cups and therefore to drive the wire positively. It is obvious that any other equivalent device could be used, for example, it would be possible to produce a tensioner according to the invention by passing the wire against the periphery of a drum or a simple pulley with groove.
D'une manière générale, le dispositif tendeur de fil conforme à l'invention est du type comportant :In general, the wire tensioning device according to the invention is of the type comprising:
- une poulie montée libre en rotation à l'extrémité d'un axe porté par un boitier, contre la surface de laquelle le fil est en contact ;- a pulley mounted free to rotate at the end of an axis carried by a housing, against the surface of which the wire is in contact;
- des moyens de freinage de ladite poulie constitués par des aimants permanents disposés concentriquement et bloqués en rotation par rapport à l'axe, et disposés en regard d'une couronne en matériau ferro¬ magnétique montée sur le palier supportant la poulie ;- means for braking said pulley constituted by magnets permanent arranged concentrically and locked in rotation relative to the axis, and arranged opposite a ring of ferro¬ magnetic material mounted on the bearing supporting the pulley;
- des moyens permettant de faire varier l'écartement entre les aimants et le palier porte-poulie par coulissement de l'un de ces éléments sur l'axe.- Means for varying the spacing between the magnets and the pulley bearing by sliding one of these elements on the axis.
Le dispositif selon l'invention se caractérise en ce que les moyens de réglage de l'écartement entre les aimants et la poulie à freiner, sont constitués par :The device according to the invention is characterized in that the means for adjusting the spacing between the magnets and the pulley to be braked, consist of:
- un premier ensemble exerçant une poussée tendant à rapprocher le support des amants de la couronne associée à la poulie jusqu'à une valeur minimale prédéterminée ;- A first assembly exerting a push tending to bring the support of the lovers of the crown associated with the pulley up to a predetermined minimum value;
- un deuxième ensemble exerçant une contre-poussée, de valeur réglable, tendant à écarter les aimants par rapport à la surface de la couronne, lesdits moyens de contre-poussée étant constitués par une source d'air comprimé agissant sur la face d'un piston monté fixe sur l'axe, en appui contre une portée de ce dernier, et dont l'autre face est soumise à l'action des premiers moyens de poussée, l'alimentation en air comprimé étant réalisée simultanément sur l'ensemble des tendeurs que comporte la machine par l'intermédiaire d'une ligne pneumatique commune.a second assembly exerting a counter-thrust, of adjustable value, tending to separate the magnets relative to the surface of the crown, said counter-thrust means being constituted by a source of compressed air acting on the face of a piston mounted fixed on the axis, pressing against a bearing surface of the latter, and the other side of which is subjected to the action of the first thrust means, the supply of compressed air being carried out simultaneously on all the tensioners that the machine comprises via a common pneumatic line.
La variation de l'écartement entre les aimants et la couronne associée à la poulie permettant de régler la tension communiquée au fil par le tendeur, peut, selon l'invention, être obtenue soit par déplacement longitudinal desdits aimants sur l'axe portant la poulie, ledit axe étant alors monté fixe sur le bâti de la machine, soit par déplacement de l'axe support de ladite poulie, la fixation sur le bâti de la machine étant alors réalisée par l'intermédiaire du boitier supportant les aimants. L'invention et les avantages qu'elle apporte sera cependant mieux comprise grâce à l'exemple de réalisation donné ci-après et qui est illustré par les schémas annexés dans lesquels :The variation in the spacing between the magnets and the crown associated with the pulley making it possible to adjust the tension communicated to the wire by the tensioner, can, according to the invention, be obtained either by longitudinal displacement of said magnets on the axis carrying the pulley , said axis then being fixedly mounted on the frame of the machine, either by displacement of the support axis of said pulley, the attachment to the frame of the machine then being produced by means of the box supporting the magnets. The invention and the advantages which it provides will however be better understood thanks to the embodiment given below and which is illustrated by the appended diagrams in which:
- la figure 1 est une vue d'ensemble d'une machine textile permettant de réaliser le câblage de deux fils élémentaires équipés d'un tendeur conforme à l'invention ;- Figure 1 is an overview of a textile machine for making the wiring of two elementary son equipped with a tensioner according to the invention;
- la figure 2 est une vue de détail en coupe longitudinale d'un tendeur réalisé conformément à l'invention ;- Figure 2 is a detail view in longitudinal section of a tensioner produced in accordance with the invention;
- la figure 3 est une vue de face d'un tel tendeur montrant la manière dont s'effectue le passage du fil autour de la "poulie" permettant de communiquer la tension ;- Figure 3 is a front view of such a tensioner showing the way in which the passage of the wire takes place around the "pulley" for communicating the tension;
- la figure 4 illustre, vue de dessus, une pluralité de tendeurs équipant quatre positions d'une machine textile, reliés à une source d'alimentation d'air sous pression commune.- Figure 4 illustrates, top view, a plurality of tensioners equipping four positions of a textile machine, connected to a source of air supply under common pressure.
La figure 1 illustre, de manière schématique et vue de côté, une position de travail d'une machine textile dite "câbleuse directe", permettant d'assembler par fausse torsion deux fils élémentaires.FIG. 1 illustrates, schematically and seen from the side, a working position of a textile machine known as a "direct cable maker", making it possible to assemble two elementary threads by false twist.
Dans un tel type de machine, connue depuis fort longtemps (voir US-In such a type of machine, known for a very long time (see US-
A-3 026 063), chaque position de travail permet donc de réunir par torsion deux fils élémentaires (A,B) provenant de deux sources d'alimentation (1,2). Le fil (A) provenant de la bobine (1) passe dans un plateau rotatif (3) ou similaire de manière à former un ballon (4) à l'intérieur duquel est disposée la source d'alimentation (2) pour le fil (B). L'assemblage des deux fils (A) et (B) est obtenu par torsion au point de réunion (5), puis le câblé (6) formé est renvidé de manière conventionnelle, par exemple sur un système de renvidage (7) ne communiquant pas de torsion additionnelle. L'appel des deux fils (A) et (B) constituant le câblé (6), est donné par la vitesse de renvidage en (7). Pour égaliser les tensions afin d'avoir un ensemble équilibré, des systèmes tendeurs (8,9) sont prévus pour chacun des fils (A,B). Le tendeur (8) permet de régler la longueur de réserve du fil (A) autour du plateau (3) et joue le rôle d'un amortisseur qui absorbe les à- coups de dévidage de la bobine (1), ce qui permet de conserver un ballonA-3 026 063), each working position therefore makes it possible to join together by twist two elementary wires (A, B) coming from two power sources (1,2). The wire (A) from the spool (1) passes through a turntable (3) or the like so as to form a balloon (4) inside which is placed the power source (2) for the wire ( B). The assembly of the two wires (A) and (B) is obtained by twisting at the meeting point (5), then the cable (6) formed is returned in a conventional manner, for example on a winding system (7) not communicating no additional twist. The call of the two wires (A) and (B) constituting the cable (6), is given by the winding speed in (7). To equalize the tensions in order to have a balanced whole, tensioning systems (8,9) are provided for each wires (A, B). The tensioner (8) makes it possible to adjust the reserve length of the wire (A) around the plate (3) and acts as a shock absorber which absorbs the unwinding of the reel from the spool (1), which makes it possible to keep a ball
(4) très régulier.(4) very regular.
Le tendeur conforme à l'invention est particulièrement adapté pour être utilisé pour donner la tension au fil (A) qui passe à l'intérieur du plateau rotatif (3) et forme le ballon (4).The tensioner according to the invention is particularly suitable for being used to give tension to the wire (A) which passes inside the rotary plate (3) and forms the balloon (4).
La câbleuse équipée de tendeurs (8) conformes à l'invention est donc constituée d'une pluralité de positions de travail identiques disposées côte à côte, les tendeurs (8) permettant d'assurer la tension du fil (A) provenant du support (1) porté par une cantre disposée, dans le cas présent, sur la partie haute de la machine, sont montés individuellement sur une plaque support (35) portée par ledit bâti. Le positionnement de ces tendeurs est avantageusement situé sur le bâti de la machine au niveau du système de renvidage, en avant de ce dernier, le fil (B) étant amené directement au frein (9) situé en amont du point de câblage (6) dans le prolongement de l'axe de la source d'alimentation (2) du fil (B).The stranding machine equipped with tensioners (8) according to the invention therefore consists of a plurality of identical working positions arranged side by side, the tensioners (8) making it possible to ensure the tension of the wire (A) coming from the support ( 1) carried by a creel arranged, in this case, on the upper part of the machine, are individually mounted on a support plate (35) carried by said frame. The positioning of these tensioners is advantageously located on the machine frame at the level of the winding system, in front of the latter, the wire (B) being brought directly to the brake (9) located upstream of the wiring point (6) in the extension of the axis of the power source (2) of the wire (B).
Ainsi que cela ressort des figures 2 et 3, dans la forme de réalisation illustrée sensiblement à l'échelle 1, le tendeur (8) conforme à l'invention comporte comme élément permettant de communiquer la tension au fil une poulie constituée de deux coupelles (11,12) entre lesquelles passe le fil (A), ces coupelles étant montées sur un moyeu (13) qui est lui-même monté libre en rotation par l'intermédiaire de roulements (14) à l'extrémité d'un arbre (15). Lesdites coupelles (11,12) sont bloquées sur le moyeu par l'intermédiaire d'un ensemble en forme d'écrou (16), ce qui permet de régler la pression des coupelles l'une contre l'autre et par suite la tension qu'elles comm uniquent au fil. Le fil (A) passe dans l'espace compris entre les deux coupelles et est maintenu au niveau de leur zone d'interpénétration, l'enveloppe du fil autour desdites coupelles étant déterminée par deux guides (17,39) (représentés uniquement à la figure 3), disposés respectivement en amont et en aval du plan d'appui.As can be seen from FIGS. 2 and 3, in the embodiment illustrated substantially on scale 1, the tensioner (8) according to the invention comprises, as an element allowing the tension to be communicated to the thread, a pulley made up of two cups ( 11,12) between which the wire (A) passes, these cups being mounted on a hub (13) which is itself mounted free to rotate by means of bearings (14) at the end of a shaft ( 15). Said cups (11,12) are locked on the hub by means of a nut-shaped assembly (16), which makes it possible to adjust the pressure of the cups against each other and consequently the tension that they communicate with the wire. The wire (A) passes through space between the two cups and is maintained at their interpenetration zone, the wire envelope around said cups being determined by two guides (17,39) (shown only in Figure 3), arranged respectively upstream and in downstream of the support plan.
Ainsi que cela ressort de la figure 2, le moyeu (13) qui supporte la poulie comporte sur sa face opposée auxdites poulies, une couronne (18) réalisée dans un matériau ferro-magnétique tel que par exemple à base de ferrite.As can be seen from FIG. 2, the hub (13) which supports the pulley comprises on its face opposite to said pulleys, a crown (18) made of a ferro-magnetic material such as for example based on ferrite.
Les moyens permettant d'assurer le freinage de la poulie sont constitués par une pluralité d'aimants permanents (19) au nombre de deux dans le cas présent, et se présentant sous la forme de pastilles ayant un diamètre de 15 mm. Ces aimants sont montés concentriquement à l'arbre (15) sur un support (20), lui-même immobilisé à l'intérieur d'un boitier (21). Le support (20) est bloqué par l'intermédiaire de vis (22), est immobilisé en rotation par rapport à l'arbre (15), mais est en revanche libre en translation par rapport à ce dernier.The means for ensuring the braking of the pulley are constituted by a plurality of permanent magnets (19) two in number in the present case, and being in the form of pellets having a diameter of 15 mm. These magnets are mounted concentrically with the shaft (15) on a support (20), itself immobilized inside a housing (21). The support (20) is blocked by means of screws (22), is immobilized in rotation relative to the shaft (15), but is however free in translation relative to the latter.
Conformément à l'invention, le tendeur comporte des moyens permettant de faire varier l'écartement entre les aimants (19) et la couronne (18) portée par la poulie, cette variation étant comprise entre une valeur minimale de 1 mm, ce qui permet d'éviter tout risque d'interférence dus à des défauts géométriques et un écartement maximal, fonction de la puissance des aimants, et qui dans le cas présent, est de 4 mm.According to the invention, the tensioner comprises means making it possible to vary the spacing between the magnets (19) and the crown (18) carried by the pulley, this variation being between a minimum value of 1 mm, which allows avoid any risk of interference due to geometric faults and a maximum spacing, depending on the power of the magnets, which in this case is 4 mm.
Ces moyens permetteant d'assurer le réglage comprennent tout d'abord un premier ensemble de poussée qui tend à rapprocher le support (20) des aimants (19) de la couronne. Ce déplacement est limité d'une valeur minimale prédéterminée et est obtenu, dans le cas présent, par un ensemble sous forme de ressort (23) disposé autour de l'arbre (15) et en appui, d'une part sur un palier annulaire fixe (24) solidaire du boitier (21) et, d'autre part, sur la face arrière d'un piston (32) solidaire de l'arbre (15), ce qui permet un coulissement du boitier (21) par rapport à l'ensemble (32- 15).These means for ensuring the adjustment firstly comprise a first thrust assembly which tends to bring the support (20) of the magnets (19) of the crown. This displacement is limited by a predetermined minimum value and is obtained, in the present case, by a assembly in the form of a spring (23) disposed around the shaft (15) and bearing, on the one hand on a fixed annular bearing (24) integral with the housing (21) and, on the other hand, on the rear face a piston (32) integral with the shaft (15), which allows the housing (21) to slide relative to the assembly (32-15).
Ainsi que cela ressort de la figure 2, le boitier (21) est conçu de manière à présenter sur sa face arrière (33) un épaulement (34), ce qui permet donc de réaliser une chambre (25) entre le fond du boitier et la face (26) du piston, l'autre face du piston prenant appui contre un épaulement prévu sur l'arbre (15). Des joints (30) et (31) sont prévus pour assurer l'étanchéité de la chambre (25). A l'intérieur de cette chambre (25), débouche l'arrivée (36) d'une alimentation en air comprimé. L'arbre (15) est monté fixe sur un support (35) solidaire du bâti de la machine.As can be seen from FIG. 2, the housing (21) is designed so as to have on its rear face (33) a shoulder (34), which therefore makes it possible to produce a chamber (25) between the bottom of the housing and the face (26) of the piston, the other face of the piston bearing against a shoulder provided on the shaft (15). Seals (30) and (31) are provided to seal the chamber (25). Inside this chamber (25), opens the arrival (36) of a compressed air supply. The shaft (15) is fixedly mounted on a support (35) integral with the machine frame.
Grâce à une telle conception, il est donc possible de pouvoir régler la tension communiquée par la poulie lors du passage du fil. Dans la représentation illustrée à la figure 2, les différents éléments du tendeur sont représentés dans leur position où les aimants (19) sont à une distance minimale prédéterminée, à savoir dans le cas présent de l'ordre de un millimètre, de la couronne (18) montée sur le moyeu (13) dans la poulie (P). Cette position permet d'obtenir une tension maximale sur le fil. Lorsque l'on souhaite modifier la valeur de la tension, on alimente la chambre (25) en air comprimé, ce qui tend donc à repousser le piston (32) qui exerce une contre-poussée sur le ressort (23), et tend donc à déplacer le boitier (21) qui porte les aimants par rapport à l'arbre (15), dans la direction allant vers la gauche si l'on considère la figure 2, ce qui permettra d'augmenter l'écartement entre lesdits aimants et la couronne (18). En conséquence, le freinage réalisé par les aimants tend à diminuer. Ainsi que cela ressort de la figure 4, il est possible grâce à une telle conception, d'alimenter une pluralité de tendeurs à partir d'une seule source d'alimentation (37) en air comprimé, l'injection d'air étant réglée par une vanne pneumatique centrale (38) et chaque délivreur (8) étant raccordé par un conduit (36) à ladite source d'alimentation.Thanks to such a design, it is therefore possible to be able to adjust the tension communicated by the pulley during the passage of the wire. In the representation illustrated in FIG. 2, the various elements of the tensioner are represented in their position where the magnets (19) are at a predetermined minimum distance, namely in the present case of the order of one millimeter, from the crown ( 18) mounted on the hub (13) in the pulley (P). This position provides maximum tension on the wire. When it is desired to modify the value of the tension, the chamber (25) is supplied with compressed air, which therefore tends to push back the piston (32) which exerts a counter-thrust on the spring (23), and therefore tends to move the housing (21) which carries the magnets relative to the shaft (15), in the direction going to the left if we consider Figure 2, which will increase the spacing between said magnets and the crown (18). Consequently, the braking performed by the magnets tends to decrease. As can be seen in FIG. 4, it is possible, thanks to such a design, to supply a plurality of tensioners from a single supply source (37) with compressed air, the air injection being regulated. by a central pneumatic valve (38) and each deliverer (8) being connected by a conduit (36) to said power source.
Dans l'exemple décrit, le déplacement des aimants par rapport à la poulie est obtenu par déplacement du boitier qui supporte les aimants sur l'arbre qui est maintenu fixe sur la machine. Il pourrait être envisagé de procéder à l'inverse, c'est-à-dire de monter le boitier fixe sur la machine, ce qui provoquera alors le déplacement de la poulie par rapport audit boitier.In the example described, the displacement of the magnets relative to the pulley is obtained by displacement of the housing which supports the magnets on the shaft which is kept fixed on the machine. It could be envisaged to proceed in reverse, that is to say to mount the fixed housing on the machine, which will then cause the displacement of the pulley relative to said housing.
Bien entendu, l'invention n'est pas limitée à l'exemple de réalisation décrit précédemment, mais elle en couvre toutes les variantes réalisées dans le même esprit. Of course, the invention is not limited to the embodiment described above, but it covers all the variants produced in the same spirit.

Claims

97/38932 PC17FR97/0039597/38932 PC17FR97 / 00395
1 01 0
REVENDICATIONS
1/ Dispositif tendeur de fil conforme à l'invention est du type comportant : - une poulie (P) montée libre en rotation à l'extrémité d'un axe (15) porté par un boitier (21), contre la surface de laquelle le fil est en contact ;1 / Wire tensioning device according to the invention is of the type comprising: - a pulley (P) mounted free in rotation at the end of an axis (15) carried by a housing (21), against the surface of which the wire is in contact;
- des moyens de freinage de ladite poulie (P) constitués par des aimants permanents (19) disposés concentriquement et bloqués en rotation par rapport à l'axe (15), et disposés en regard d'une couronne (18) en matériau ferro-magnétique montée sur le palier (13) supportant la poulie (P) ;- means for braking said pulley (P) constituted by permanent magnets (19) arranged concentrically and locked in rotation relative to the axis (15), and arranged opposite a crown (18) made of ferro- material magnetic mounted on the bearing (13) supporting the pulley (P);
- des moyens permettant de faire varier l'écartement entre les aimants (19) et le palier porte-poulie (13) par coulissement de l'un de ces éléments sur l'axe (15), caractérisé en ce que les moyens de réglage de l'écartement entre les aimants (19) et la poulie (P) à freiner, sont constitués par :- Means for varying the spacing between the magnets (19) and the pulley bearing (13) by sliding one of these elements on the axis (15), characterized in that the adjustment means the spacing between the magnets (19) and the pulley (P) to be braked, consist of:
- un premier ensemble (23,24) exerçant une poussée tendant à rapprocher le support (20) des amants (19) de la couronne (18) associée à la poulie (P) jusqu'à une valeur minimale prédéterminée ; - un deuxième ensemble (25,32) exerçant une contre-poussée, de valeur réglable, tendant à écarter les aimants (19) de la couronne (18), lesdits moyens de contre-poussée étant constitués par une source d'air comprimé (36) agissant sur la face (26) d'un piston (32) monté fixe sur l'axe (15), et en appui contre une portée (29) de ce dernier, et dont l'autre face (27) est soumise à l'action des premiers moyens de poussée (23), l'alimentation en air comprimé étant réalisée simultanément sur l'ensemble des tendeurs que comporte la machine par l'intermédiaire d'une ligne pneumatique (37). 2/ Dispositif selon la revendication 1, caractérisé en ce que la variation de l'écartement entre les aimants (19) et la couronne (18) associée à la poulie (P) est obtenue par déplacement longitudinal desdits aimants (19) sur l'axe (15) portant la poulie, ledit axe étant alors monté fixe sur le bâti de la machine.- A first assembly (23,24) exerting a push tending to bring the support (20) of the lovers (19) of the crown (18) associated with the pulley (P) to a predetermined minimum value; - a second assembly (25,32) exerting a counter-thrust, of adjustable value, tending to separate the magnets (19) from the crown (18), said counter-thrust means being constituted by a source of compressed air ( 36) acting on the face (26) of a piston (32) mounted fixed on the axis (15), and in abutment against a bearing surface (29) of the latter, and of which the other face (27) is subjected when the first thrust means (23) act, the supply of compressed air being carried out simultaneously on all the tensioners that the machine comprises via a pneumatic line (37). 2 / Device according to claim 1, characterized in that the variation in the spacing between the magnets (19) and the crown (18) associated with the pulley (P) is obtained by longitudinal displacement of said magnets (19) on the axis (15) carrying the pulley, said axis then being fixedly mounted on the frame of the machine.
3/ Dispositif selon la revendication 1, caractérisé en ce que la variation de l'écartement entre les aimants (19) et la couronne (18) associée à la poulie (P) est obtenue par déplacement de l'axe (15) supportant ladite poulie, la fixation sur le bâti de la machine étant réalisée par l'intermédiaire du boitier (21) supportant les aimants (19).3 / Device according to claim 1, characterized in that the variation in the spacing between the magnets (19) and the crown (18) associated with the pulley (P) is obtained by displacement of the axis (15) supporting said pulley, the attachment to the frame of the machine being carried out by means of the housing (21) supporting the magnets (19).
4/ Matériel textile équipé d'un dispositif tendeur selon l'une des revendications 1 et 3, comportant une pluralité de positions de travail identiques, caractérisé en ce que le réglage des dispositifs tendeurs (8) est effectué simultanément sur l'ensemble des délivreurs de la machine qui remplissent la même fonction. 4 / Textile material equipped with a tensioning device according to one of claims 1 and 3, comprising a plurality of identical working positions, characterized in that the adjustment of the tensioning devices (8) is carried out simultaneously on all of the deliverers of the machine which perform the same function.
EP97914358A 1996-04-18 1997-03-06 Yarn tensioning device and textile machine equipped therewith Expired - Lifetime EP0900171B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9605119 1996-04-18
FR9605119A FR2747663B1 (en) 1996-04-18 1996-04-18 YARN TENSIONING DEVICE AND TEXTILE MATERIAL EQUIPPED WITH SUCH A DEVICE
PCT/FR1997/000395 WO1997038932A1 (en) 1996-04-18 1997-03-06 Yarn tensioning device and textile machine equipped therewith

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JP (1) JP3898763B2 (en)
CN (1) CN1085975C (en)
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DE (1) DE69701222T2 (en)
ES (1) ES2142150T3 (en)
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DE69701222D1 (en) 2000-03-02
EP0900171B1 (en) 2000-01-26
DE69701222T2 (en) 2000-09-28
ES2142150T3 (en) 2000-04-01
JP3898763B2 (en) 2007-03-28
FR2747663B1 (en) 1998-05-22
ATE189179T1 (en) 2000-02-15
AU2163597A (en) 1997-11-07
FR2747663A1 (en) 1997-10-24
US5943851A (en) 1999-08-31
JP2001500462A (en) 2001-01-16
CN1206387A (en) 1999-01-27
WO1997038932A1 (en) 1997-10-23
CN1085975C (en) 2002-06-05

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