EP0409743A1 - Yarn-tensioning device for textile machines - Google Patents

Yarn-tensioning device for textile machines Download PDF

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Publication number
EP0409743A1
EP0409743A1 EP90420300A EP90420300A EP0409743A1 EP 0409743 A1 EP0409743 A1 EP 0409743A1 EP 90420300 A EP90420300 A EP 90420300A EP 90420300 A EP90420300 A EP 90420300A EP 0409743 A1 EP0409743 A1 EP 0409743A1
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EP
European Patent Office
Prior art keywords
rollers
wire
roller
axis
tensioning device
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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
EP90420300A
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German (de)
French (fr)
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EP0409743B1 (en
Inventor
Carlos Matas Gabalda
Bernard Puaux
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ICBT Lyon SA
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ICBT Lyon SA
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10Adjusting 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
    • B65H59/16Braked elements rotated by material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00Handled material; Storage means
    • B65H2701/30Handled filamentary material
    • B65H2701/31Textiles 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.
  • drum braked by magnetic brake implies having a "drum” of relatively large diameter (of the order of 80 to 100 mm) if one wants to obtain a good surface. wire adhesion. Furthermore, during start-up, it has the disadvantage of causing voltage surges. Finally and above all, these solutions require pre-braking in the absence of which there can be no adhesion of the wire to the pulley.
  • the braking means of the rollers are generally incorporated therein and they do not make it possible to adjust the tension during operation.
  • the braking means are designed so as to allow adjustment during operation.
  • the tensioning device of the type comprising rollers mounted free in rotation on a support box, at least one of these rollers being subjected to the action of an adjustable braking system at permanent magnet (or magnetic brake) and the wire during its movement coming to embarrass around the periphery of said rollers, the displacement of the wire upstream and downstream of the tensioner assembly being carried out in a common direction known as the "running axis", is characterized in that said rollers are three in number and are mounted on the support box so that: - two of these rollers called “input rollers” are arranged in the vicinity of the wire introduction zone, substantially on either side of the travel axis, at least one of these rollers comprising a device adjustable braking and their mounting being carried out so that they are maintained in tangential contact with each other; - The third roller called “output roller” being in turn, positioned downstream of the above rollers if we follow the path of the wire, its surface tangent to the axis of travel.
  • the input rollers are preferably rubberized rollers, the output roller having, for its part, a hard surface (for example metallic) to resist friction due to torsion.
  • the device according to the invention is preferably associated, at the level of the wire entry zone, with a pretensioning device which is also the subject of the present invention and which makes it possible to absorb the reels and prevents them from being passed on downstream.
  • the three rollers are maintained in mutual contact, the second and third rollers being mounted on the housing by means of a lever (or the like) subjected to the action of a return means ( spring..).
  • the second roller being, as before, mounted on the housing by means of an articulated arm subjected to the action of a return spring and the third roller being, meanwhile, mounted along a fixed axis on the housing.
  • the first and third rollers are mounted free in rotation about a fixed axis, the second roller being, for its part, kept under pressure against the two aforementioned rollers by magnetism using a magnet (or any other equivalent system), the second roller can be either completely free and detached from the support box, or mounted on this box by any guide system leaving it free to make its contact with the other two rollers.
  • the tensioning device consists of a plurality of rollers which are mounted free in rotation on a support housing designated by the general reference (1), itself fixed on the machine frame (2).
  • the wire (3) which is intended to be twisted comes from a power source (not shown) and penetrates inside the support box (1) through a guide eyelet (4) then comes to tie up around the rollers and exits at (25) to be brought to the winding system not shown.
  • the scrolling of the thread upstream and downstream of the tensioning device is carried out along a designated axis XX, in the following description by the expression "scrolling axis".
  • rollers there are three rollers respectively (5.6 and 7). Each roller is mounted in a known manner on the support box (1) so that during the passage of the wire, the latter drives them in rotation. Braking means are associated with at least one of these rollers, in the present case with the roller (5), an embodiment allowing adjustment in operation and which is also part of the invention, being preferably associated with the first roller (5).
  • the structure of such a braking element will be seen in more detail in the following description.
  • the rollers (5, 6, 7) are mounted on the support box (1) so that : - The first two rollers (5,6) are arranged near the inlet guide eyelet (4) and substantially on either side of the thread axis (XX); - The third roller (7) is, in turn, mounted above the second roller (6) and is arranged so that its surface comes to tangent with the axis of travel (XX); in this way, at the output of the tensioning device, the wire does not undergo any embarrassment and leaves directly.
  • the three rollers are in mutual contact, the second roller (6) and the third roller (7) being mounted on pivoting arms (8,9), subjected to the action return springs (10,11) simply shown in Figure 1.
  • the two rollers (5,6) are coated with a layer of rubber while the roller (7) has a hard surface and is preferably made of metal.
  • the roller (7) acts as a torsion ascent blocker and, moreover, as it is kept in contact with the second roller (6), it ensures the holding the wire (3) even when stopped.
  • the third roller (7) is not kept in contact with the roller (6), but is mounted to rotate freely on a fixed axis.
  • This embodiment simplifies the design of the tensioner, but on the other hand, the wire is not not perfectly maintained at a standstill as in the preferred embodiment.
  • the third roller (7) is mounted to rotate freely on a fixed axis, but is also in contact with the second roller (6); the wire is therefore perfectly kept stationary.
  • the second roller (6) as in the preferred embodiment illustrated in Figure 1, is in contact with the inlet roller (5) and the third outlet roller (7).
  • This second roller 6) is kept under pressure against the other two by magnetism, using a magnet (26), or by any other system making it possible to ensure its contact with the other two rollers.
  • the second roller (6) can be entirely free and disconnected from the support box (1) or from any other part relating thereto; it can also be secured to the support block (1) by any guide system giving it complete freedom to make contact with the rollers (5) and (7).
  • Such an embodiment simplifies the design of the tensioning device.
  • FIG. 3 and 4 are sections along the axes AA and BB of Figure 1 showing in more detail the structure of the rollers (5,6,7) that comprises the wire tensioner according to the invention. It should be noted that in the variant illustrated in FIG. 5, the only difference lies in the fact that the third roller (7) is not kept in contact with the roller (6).
  • each roller is mounted on the support box (1) by means of bearings carried by support pins (5a, 6a, 7a).
  • the input roller (5) is, as shown in Figure 3, associated with a braking device designated by the general reference (F) which can be adjusted in function operation.
  • This braking device is of the permanent magnet hysteresis type. Any other equivalent device could of course be used.
  • this braking device (F) is mounted on the other side of the housing (1) relative to the roller (5). It essentially consists of a fixed body (12) in the form of a cage centered on the axis (5a) of the roller (5), a bearing being interposed between this body (12) and the axis (5a).
  • a disc (13) comprising a hysteresis washer (14) is fixed by means of a screw (15) on the end of the axis (5a). Opposite this disc, is disposed a set of magnets (16) mounted on a ring (17), a ring which can be moved inside the fixed body (12) so as to modify the air gap between the magnets ( 16) and the hysteresis washer (14).
  • a single braking device associated with the first roller (5) is sufficient, it can also be envisaged to associate with the second roller (6) or even also with the third roller (7), a braking element additional not adjustable in operation.
  • the device according to the invention is preferably associated with an assembly making it possible to eliminate the voltage surges which occur upstream of the inlet eyelet (4).
  • a compensator assembly essentially consists of two additional eyelets (20,21) arranged at the entry of the tensioner along the axis of travel XX.
  • One of the eyelets (21) is mounted on a pivoting arm (see Figure 2) while the second is fixedly mounted on the base of the housing (1).
  • Two magnets respectively (23,24) are mounted one on the base of the housing (1) (magnet (23)), the other (24) on the pivoting arm (22). These two magnets are arranged so their faces of the same polarity are facing each other. In this way, the arm (22) tends to be pushed back as illustrated in FIG. 2 in dashed lines and, when the wire (3) passes, a tie is thus formed upstream of the entry eyelet (4). variable to eliminate voltage surges.
  • Such a tensioning device of simple and particularly effective design makes it possible to ensure a regular and constant tension in the thread, without variation during operation.
  • the braking system accessible from the outside that includes one of the rollers, it is possible to make adjustments during operation.
  • Such a device can be used on any type of textile material.

Landscapes

  • Tension Adjustment In Filamentary Materials (AREA)
  • Knitting Machines (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

Dispositif tendeur de fil du type comportant trois galets (5), (6), (7) montés libres en rotation sur un boitier support (1), au moins l'un de ces galets étant soumis à l'action d'un système de freinage à aimant permanent réglable (ou frein magnétique) et le fil (3) lors de son déplacement venant embarrer autour de la périphérie desdits galets, le déplacement du fil en amont et en aval de l'ensemble tendeur étant réalisé selon une direction (XX) commune dite "axe de défilement". Les galets sont montés sur le boitier support (1) de telle sorte que : - les deux galets (5), (6) dits "galets d'entrée" soient disposés au voisinage de la zone d'introduction du fil et soient maintenus en contact sensiblement de part et d'autre de l'axe de défilement, au moins l'un de ces galets (5) comportant un dispositif de freinage réglable ; - le troisième galet (7) dit "galet de sortie" étant quant à lui, positionné en aval des galets précités si l'on suit le trajet du fil, sa surface tangentant avec l'axe de défilement (XX).Wire tensioning device of the type comprising three rollers (5), (6), (7) mounted free in rotation on a support box (1), at least one of these rollers being subjected to the action of a system brake with adjustable permanent magnet (or magnetic brake) and the wire (3) during its movement coming to lock around the periphery of said rollers, the movement of the wire upstream and downstream of the tensioner assembly being carried out in a direction ( XX) common called "scroll axis". The rollers are mounted on the support box (1) so that: - the two rollers (5), (6) called "input rollers" are arranged in the vicinity of the zone for introducing the wire and are held in contact substantially on either side of the travel axis, at least one of these rollers (5) comprising an adjustable braking device; - The third roller (7) called "output roller" being in turn, positioned downstream of the aforementioned rollers if one follows the path of the wire, its surface tangent to the axis of travel (XX).

Description

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, parmi lesquelles on peut mentionner celle citée dans le préambule du brevet français no. 2 145 056 et qui consiste à faire passer le fil en mouve­ment en contact avec la surface d'une poulie ou galet soumis à l'action de moyens de freinage constitués par un frein à courant de Foucault ainsi que cela résulte du brevet français 2 167 957 en freinant ladite poulie de guidage du fil au moyen d'un ensemble comprenant 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 obtenu en faisant varier la distance entre le disque et l'aimant.During the various transformation operations that a thread undergoes during its development, it is essential to communicate to it a tension as regular and constant as possible. To do this, numerous solutions of tensioning devices have been proposed to date, among which we may mention that cited in the preamble of French patent no. 2 145 056 and which consists in passing the moving wire in contact with the surface of a pulley or roller subjected to the action of braking means constituted by an eddy current brake as this results from French patent 2 167 957 by braking said wire guide pulley by means of an assembly comprising a magnet whose number of magnetic poles is even, this magnet being placed opposite a disc the face of which is pierced with 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.

Ces solutions qui peuvent être résumées par l'ex­pression "tambour freiné par frein magnétique" implique cependant d'avoir un "tambour" de diamètre relativement important (de l'ordre de 80 à 100 mm) si l'on veut ob­tenir une bonne surface d'adhérence du fil. Par ail­leurs, lors de la mise en route, elle présente comme inconvénient d'entraîner des à-coups de tension. Enfin et surtout, ces solutions nécessitent un pré-freinage en l'absence duquel il ne peut y avoir adhérence du fil sur la poulie.These solutions which can be summarized by the expression "drum braked by magnetic brake" however implies having a "drum" of relatively large diameter (of the order of 80 to 100 mm) if one wants to obtain a good surface. wire adhesion. Furthermore, during start-up, it has the disadvantage of causing voltage surges. Finally and above all, these solutions require pre-braking in the absence of which there can be no adhesion of the wire to the pulley.

Pour résoudre ces problèmes, il a été proposé, comme cela ressort du FR-A-2 295 900 de réaliser des disposi­tifs tendeurs comportant deux rouleaux montés en rotation dans un carter et qui se touchent le long de leurs cir­conférences avec une pression réglable, au moins l'un de ces rouleaux étant garni d'un bandage en une matière ayant une élasticité du caoutchouc et le fil à tendre étant guidé de manière à ce qu'il entraîne les deux rou­leaux lorsqu'il traverse le dispositif. Un tel dispositif largement utilisé de nos jours, présente cependant comme inconvénient que, notamment compte tenu des grandes vi­tesses de production actuelles, il se produit un échauf­fement de la couche de caoutchouc en cours de fonctionne­ment, variation qui se répercute sur la qualité du fil produit.To solve these problems, it has been proposed, as is apparent from FR-A-2 295 900 to make tensioning devices comprising two rollers mounted in rotation in a casing and which touch along their circumferences with an adjustable pressure, at at least one of these rollers being provided with a bandage of a material having an elasticity of rubber and the soft wire being guided so that it drives the two rollers when it passes through the device. However, such a device which is widely used today has the drawback that, especially given the current high production speeds, the rubber layer heats up during operation, a variation which affects the quality of the wire produced. .

Il a également été proposé, notamment afin d'obtenir une mise en tension progressive lors du lancement de la machine ainsi qu'une tension aussi constante que possible en fonctionnement normal des dispositifs tendeurs compor­tant plusieurs galets montés libres en rotation sur un boitier support, soumis à l'action de moyens de freinage (frein magnétique), des guide-fils étant prévus sur le boitier en amont et en aval desdits galets si l'on con­sidère le sens de déplacement du fil afin que ce dernier embarre autour de la périphérie desdits galets lors de son passage au travers du dispositif tendeur.It has also been proposed, in particular in order to obtain a progressive tensioning during the launching of the machine as well as a tension as constant as possible in normal operation of the tensioning devices comprising several rollers mounted free in rotation on a support unit, subject to the action of braking means (magnetic brake), wire guides being provided on the housing upstream and downstream of said rollers if we consider the direction of movement of the wire so that the latter sets in around the periphery of said rollers as it passes through the tensioning device.

De tels dispositifs présentent cependant encore un certain nombre d'inconvénients parmi lesquels on peut citer le fait que l'embarrage de sortie qui est utilisé comme multiplicateur de freinage entraîne également une multiplication des à-coups de défilement occasionnels de la bobine en amont. Par ailleurs, les conditions de frot­tement sur les oeillets peuvent varier par suite de la modification de l'état de surface due notamment au dépôt d'ensimage, ce qui entraîne donc une variation de la ten­sion de sortie du fil.However, such devices still have a certain number of drawbacks, among which we can cite the fact that the output tie-down which is used as a braking multiplier also leads to a multiplication of the occasional running jolts of the coil upstream. Furthermore, the friction conditions on the eyelets can vary as a result of the modification of the surface condition due in particular to the deposition of size, which therefore causes a variation in the output voltage of the wire.

Enfin, les moyens de freinage des galets sont en général incorporés à ces derniers et ils ne permettent pas de régler la tension au cours du fonctionnement.Finally, the braking means of the rollers are generally incorporated therein and they do not make it possible to adjust the tension during operation.

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, notamment par le fait qu'il élimine tout risque de transmission des à-coups de défilement qui peuvent se produire en amont dudit dispositif tendeur, la tension de sortie étant également maintenue à une valeur cons­tante non susceptible de varier en cours de fonctionne­ment.Now we have found, and this is what is the subject of the present invention, a new type of tensioning device which overcomes the drawbacks of previous solutions, in particular by the fact that it eliminates any risk of transmission of jolts. scrolling which can occur upstream of said tensioning device, the output voltage also being maintained at a constant value which is not likely to vary during operation.

Par ailleurs, selon une forme de réalisation préfé­rentielle, les moyens de freinage sont conçus de manière à permettre un réglage en cours de fonctionnement.Furthermore, according to a preferred embodiment, the braking means are designed so as to allow adjustment during operation.

D'une manière générale, le dispositif tendeur con­forme à l'invention du type comportant des galets montés libres en rotation sur un boitier support, au moins l'un de ces galets étant soumis à l'action d'un système de freinage réglable à aimant permanent (ou frein magnéti­que) et le fil lors de son déplacement venant embarrer autour de la périphérie desdits galets, le déplacement du fil en amont et en aval de l'ensemble tendeur étant réalisé selon une direction commune dite "axe de défile­ment", se caractérise en ce que lesdits galets sont au nombre de trois et sont montés sur le boitier support de telle sorte que :
- deux de ces galets dits "galets d'entrée" soient disposés au voisinage de la zone d'introduction du fil, sensiblement de part et d'autre de l'axe de défilement, au moins l'un de ces galets comportant un dispositif de freinage réglable et leur montage étant réalisé de telle sorte qu'ils soient maintenus en contact tangentiel l'un avec l'autre ;
- le troisième galet dit "galet de sortie" étant quant à lui, positionné en aval des galets précités si l'on suit le trajet du fil, sa surface tangentant avec l'axe de défilement.
In general, the tensioning device according to the invention of the type comprising rollers mounted free in rotation on a support box, at least one of these rollers being subjected to the action of an adjustable braking system at permanent magnet (or magnetic brake) and the wire during its movement coming to embarrass around the periphery of said rollers, the displacement of the wire upstream and downstream of the tensioner assembly being carried out in a common direction known as the "running axis", is characterized in that said rollers are three in number and are mounted on the support box so that:
- two of these rollers called "input rollers" are arranged in the vicinity of the wire introduction zone, substantially on either side of the travel axis, at least one of these rollers comprising a device adjustable braking and their mounting being carried out so that they are maintained in tangential contact with each other;
- The third roller called "output roller" being in turn, positioned downstream of the above rollers if we follow the path of the wire, its surface tangent to the axis of travel.

Dans le dispositif conforme à l'invention, les ga­lets d'entrée sont de préférence des galets caoutchou­tés, le galet de sortie présentant, quant à lui, une surface dure (par exemple métallique) pour résister aux frottements dus à la torsion.In the device according to the invention, the input rollers are preferably rubberized rollers, the output roller having, for its part, a hard surface (for example metallic) to resist friction due to torsion.

Par ailleurs, le dispositif conforme à l'invention est de préférence associé, au niveau de la zone d'entrée du fil, à un dispositif de prétension qui fait également l'objet de la présente invention et qui permet d'absor­ber les à-coups de dévidage et évite qu'ils ne se réper­cutent en aval.Furthermore, the device according to the invention is preferably associated, at the level of the wire entry zone, with a pretensioning device which is also the subject of the present invention and which makes it possible to absorb the reels and prevents them from being passed on downstream.

Diverses formes de réalisation du dispositif selon l'invention peuvent être envisagées.Various embodiments of the device according to the invention can be envisaged.

Ainsi, selon une première forme de réalisation, les trois galets sont maintenus en contact mutuel, les deu­xième et troisième galets étant montés sur le boitier au moyen d'un levier (ou similaire) soumis à l'action d'un moyen de rappel (ressort..).Thus, according to a first embodiment, the three rollers are maintained in mutual contact, the second and third rollers being mounted on the housing by means of a lever (or the like) subjected to the action of a return means ( spring..).

Selon une autre forme de réalisation, seuls les deux premiers galets sont maintenus en contact mutuel, le deuxième galet étant, comme précédemment, monté sur le boitier par l'intermédiaire d'un bras articulé soumis à l'action d'un ressort de rappel et le troisième galet étant, quant à lui, monté selon un axe fixe sur le boi­tier.According to another embodiment, only the first two rollers are kept in mutual contact, the second roller being, as before, mounted on the housing by means of an articulated arm subjected to the action of a return spring and the third roller being, meanwhile, mounted along a fixed axis on the housing.

Selon une autre variante dans laquelle les trois galets sont également maintenus en contact mutuel, les premier et troisième galets sont montés libres en rota­tion autour d'un axe fixe, le second galet étant, quant à lui, maintenu en pression contre les deux galets précités par magnétisme à l'aide d'un aimant (ou tout autre sys­tème équivalent), le second galet pouvant être soit en­tièrement libre et désolidarisé du boitier support, soit monté sur ce boitier par tout système de guidage lui laissant toute liberté pour réaliser son contact avec les deux autres galets.According to another variant in which the three rollers are also kept in mutual contact, the first and third rollers are mounted free in rotation about a fixed axis, the second roller being, for its part, kept under pressure against the two aforementioned rollers by magnetism using a magnet (or any other equivalent system), the second roller can be either completely free and detached from the support box, or mounted on this box by any guide system leaving it free to make its contact with the other two rollers.

Grâce à une telle conception d'un dispositif ten­deur, il est possible d'éliminer tous les à-coups de défilement occasionnels qui peuvent se produire en amont et, par ailleurs, la tension en fonctionnement normal est maintenue à une valeur constante, parfaitement dé­terminée.Thanks to such a design of a tensioning device, it is possible to eliminate all the occasional jolts which may occur upstream and, moreover, the tension in normal operation is maintained at a constant value, perfectly determined. .

L'invention et les avantages qu'elle apporte seront cependant mieux compris grâce aux exemples de réalisa­tion donnés ci-après à titre indicatif mais non limita­tif et qui sont illustrés par les schémas annexés dans lesquels :

  • - la figure 1 est une vue schématique en coupe et en élévation d'un dispositif tendeur conforme à l'inven­tion ;
  • - la figure 2 est une vue de dessus, montrant une forme de réalisation d'un dispositif de prétension an­nexe associé à un tendeur conforme à l'invention et per­mettant d'éliminer tous les à-coups de tension lors du dévidage ;
  • - les figures 3 et 4 sont des vues en coupe selon les axes AA et BB de la figure 1 montrant la structure des galets entrant dans la réalisation d'un dispositif conforme à l'invention ;
  • - la figure 5 illustre d'une manière similaire à la figure 1 une autre forme de réalisation d'un tendeur conforme à l'invention ;
  • - la figure 6 illustre d'une manière similaire à la figure 1 une variante selon laquelle les trois galets sont maintenus en contact mutuel, la figure 7 étant une vue de détail en coupe selon B de la figure 6 illustrant la manière dont est réalisée cette mise en contact entre les galets.
The invention and the advantages which it brings will however be better understood thanks to the exemplary embodiments given below by way of indication but not limitation and which are illustrated by the appended diagrams in which:
  • - Figure 1 is a schematic sectional view in elevation of a tensioning device according to the invention;
  • - Figure 2 is a top view, showing an embodiment of an additional pretensioner device associated with a tensioner according to the invention and making it possible to eliminate all the voltage surges during the unwinding;
  • - Figures 3 and 4 are sectional views along the axes AA and BB of Figure 1 showing the structure of the rollers used in the production of a device according to the invention;
  • - Figure 5 illustrates in a similar manner to Figure 1 another embodiment of a tensioner according to the invention;
  • - Figure 6 illustrates in a manner similar to Figure 1 a variant in which the three rollers are held in mutual contact, Figure 7 being a detail view in section along B of Figure 6 illustrating how this is achieved contact between the rollers.

Dans la suite de la description, le dispositif ten­deur de fil conforme à l'invention sera décrit en con­sidérant que le trajet du fil en amont et en aval dudit dispositif tendeur est vertical mais, bien entendu, cela n'est pas limitatif.In the following description, the wire tensioning device according to the invention will be described by considering that the path of the wire upstream and downstream of said tensioning device is vertical but, of course, this is not limiting.

Par ailleurs, dans les deux modes de réalisation illustrés, les mêmes éléments sont désignés par les mêmes références.Furthermore, in the two illustrated embodiments, the same elements are designated by the same references.

Dans le premier mode de réalisation illustré par les figures 1 à 4, le dispositif tendeur selon l'inven­tion est constitué par une pluralité de galets qui sont montés libres en rotation sur un boitier support désigné par la référence générale (1), lui-même fixé sur le bâti (2) de la machine.In the first embodiment illustrated by Figures 1 to 4, the tensioning device according to the invention consists of a plurality of rollers which are mounted free in rotation on a support housing designated by the general reference (1), itself fixed on the machine frame (2).

Dans un tel dispositif, le fil (3) qui est destiné à être retordu provient d'une source d'alimentation non représentée et pénètre à l'intérieur du boitier support (1) au travers d'un oeillet de guidage (4) puis vient embarrer autour des rouleaux et sort en (25) pour être amené au système de renvidage non représenté. Le défile­ment du fil en amont et en aval du dispositif tendeur est réalisé selon un axe XX désigné, dans la suite de la description par l'expression "axe de défilement".In such a device, the wire (3) which is intended to be twisted comes from a power source (not shown) and penetrates inside the support box (1) through a guide eyelet (4) then comes to tie up around the rollers and exits at (25) to be brought to the winding system not shown. The scrolling of the thread upstream and downstream of the tensioning device is carried out along a designated axis XX, in the following description by the expression "scrolling axis".

Conformément à l'invention, les galets sont au nom­bre de trois respectivement (5,6 et 7). Chaque galet est monté de manière connue sur le boitier support (1) de telle sorte que lors du passage du fil, ce dernier les entraîne en rotation. Des moyens de freinage sont asso­ciés à au moins l'un de ces galets, dans le cas présent au galet (5), un mode de réalisation permettant un ré­glage en marche et qui fait également partie de l'inven­tion, étant de préférence associé au premier galet (5). La structure d'un tel élément de freinage sera vu plus en détail dans la suite de la description.According to the invention, there are three rollers respectively (5.6 and 7). Each roller is mounted in a known manner on the support box (1) so that during the passage of the wire, the latter drives them in rotation. Braking means are associated with at least one of these rollers, in the present case with the roller (5), an embodiment allowing adjustment in operation and which is also part of the invention, being preferably associated with the first roller (5). The structure of such a braking element will be seen in more detail in the following description.

Afin d'éviter que les à-coups de tension produits en amont du dispositif (1) lors du guidage du fil ne se répercutent, les galets (5,6,7) sont montés sur le boi­tier support (1) de telle sorte que :
- les deux premiers galets (5,6) soient disposés à proximité de l'oeillet de guidage d'entrée (4) et sen­siblement de part et d'autre de l'axe de défilement (XX) du fil ;
- le troisième galet (7) est, quant à lui, monté au-dessus du second galet (6) et est disposé de telle sorte que sa surface vienne tangenter avec l'axe de défi­lement (XX) ; de cette manière, en sortie de l'appareil tendeur, le fil ne subit aucun embarrage et sort directe­ment.
In order to prevent the voltage surges produced upstream of the device (1) during the guiding of the wire from being passed on, the rollers (5, 6, 7) are mounted on the support box (1) so that :
- The first two rollers (5,6) are arranged near the inlet guide eyelet (4) and substantially on either side of the thread axis (XX);
- The third roller (7) is, in turn, mounted above the second roller (6) and is arranged so that its surface comes to tangent with the axis of travel (XX); in this way, at the output of the tensioning device, the wire does not undergo any embarrassment and leaves directly.

Selon le premier mode de réalisation illustré par la figure 1, les trois galets sont en contact mutuel, le deuxième galet (6) et le troisième galet (7) étant mon­tés sur des bras pivotants (8,9), soumis à l'action de ressorts de rappel (10,11) simplement schématisés à la figure 1. Les deux galets (5,6) sont revêtus d'une cou­che de caoutchouc alors que le galet (7) présente quant à lui une surface dure et est de préférence en métal.According to the first embodiment illustrated in Figure 1, the three rollers are in mutual contact, the second roller (6) and the third roller (7) being mounted on pivoting arms (8,9), subjected to the action return springs (10,11) simply shown in Figure 1. The two rollers (5,6) are coated with a layer of rubber while the roller (7) has a hard surface and is preferably made of metal.

Dans le mode de réalisation préférentiel de la fi­gure 1, le galet (7) joue le rôle de bloqueur de remontée de torsion et, par ailleurs, comme il est maintenu en contact avec le second galet (6), il permet d'assurer le maintien du fil (3) même à l'arrêt.In the preferred embodiment of FIG. 1, the roller (7) acts as a torsion ascent blocker and, moreover, as it is kept in contact with the second roller (6), it ensures the holding the wire (3) even when stopped.

Dans la variante illustrée à la figure 5, le troi­sième galet (7) n'est pas maintenu en contact avec le galet (6), mais est monté libre en rotation sur un axe fixe. Cette forme de réalisation permet de simplifier la conception du tendeur, mais en revanche, le fil n'est pas parfaitement maintenu à l'arrêt comme dans le mode de réalisation préférentiel.In the variant illustrated in FIG. 5, the third roller (7) is not kept in contact with the roller (6), but is mounted to rotate freely on a fixed axis. This embodiment simplifies the design of the tensioner, but on the other hand, the wire is not not perfectly maintained at a standstill as in the preferred embodiment.

Dans la variante illustrée aux figures 6 et 7, le troisième galet (7) est monté libre en rotation sur un axe fixe, mais est également en contact avec le second galet (6) ; le fil est donc parfaitement maintenu à l'ar­rêt. Le second galet (6), comme dans le mode de réalisa­tion préférentiel illustré par la figure 1, est en con­tact avec le galet d'entrée (5) et le troisième galet de sortie (7). Ce second galet 6) est maintenu en pression contre les deux autres par magnétisme, à l'aide d'un aimant (26), ou par tout autre système permettant d'as­surer son contact avec les deux autres galets. Dans un tel mode de réalisation, le second galet (6) peut être entièrement libre et désolidarisé du boitier support (1) ou de toute autre pièce s'y rapportant ; celui-ci peut également être solidaire du bloc support (1) par tout système de guidage lui laissant toute liberté pour réali­ser son contact avec les galets (5) et (7). Une telle forme de réalisation permet de simplifier la conception du dispositif tendeur.In the variant illustrated in FIGS. 6 and 7, the third roller (7) is mounted to rotate freely on a fixed axis, but is also in contact with the second roller (6); the wire is therefore perfectly kept stationary. The second roller (6), as in the preferred embodiment illustrated in Figure 1, is in contact with the inlet roller (5) and the third outlet roller (7). This second roller 6) is kept under pressure against the other two by magnetism, using a magnet (26), or by any other system making it possible to ensure its contact with the other two rollers. In such an embodiment, the second roller (6) can be entirely free and disconnected from the support box (1) or from any other part relating thereto; it can also be secured to the support block (1) by any guide system giving it complete freedom to make contact with the rollers (5) and (7). Such an embodiment simplifies the design of the tensioning device.

Les figures 3 et 4 sont des coupes selon les axes AA et BB de la figure 1 montrant plus en détail la structure des galets (5,6,7) que comporte le tendeur de fil conforme à l'invention. Il convient de noter que dans la variante illustrée par la figure 5, la seule diffé­rence réside dans le fait que le troisième galet (7) n'est pas maintenu en contact avec le galet (6).Figures 3 and 4 are sections along the axes AA and BB of Figure 1 showing in more detail the structure of the rollers (5,6,7) that comprises the wire tensioner according to the invention. It should be noted that in the variant illustrated in FIG. 5, the only difference lies in the fact that the third roller (7) is not kept in contact with the roller (6).

Si l'on se reporte à ces schémas, chaque galet est monté sur le boitier support (1) par l'intermédiaire de roulements portés par des axes support (5a,6a,7a). Le galet d'entrée (5) est, ainsi que cela ressort de la figure 3, associé à un dispositif de freinage désigné par la référence générale (F) pouvant être réglé en fonc­ tionnement. Ce dispositif de freinage est du type à hys­téresis à aimant permanent. Tout autre dispositif équiva­lent pourrait bien entendu être utilisé. Dans la forme de réalisation illustrée, ce dispositif de freinage (F) est monté de l'autre côté du boitier (1) par rapport au galet (5). Il est constitué essentiellement par un corps fixe (12) en forme de cage centré sur l'axe (5a) du galet (5), un roulement étant interposé entre ce corps (12) et l'axe (5a). Un disque (13) comportant une rondelle d'hysteresis (14) est fixé par l'intermédiaire d'une vis (15) sur l'extrémité de l'axe (5a). En regard de ce disque, est disposé un jeu d'aimants (16) monté sur une bague (17), bague qui peut être déplacée à l'intérieur du corps fixe (12) de manière à modifier l'entrefer entre les aimants (16) et la rondelle d'hysteresis (14).If we refer to these diagrams, each roller is mounted on the support box (1) by means of bearings carried by support pins (5a, 6a, 7a). The input roller (5) is, as shown in Figure 3, associated with a braking device designated by the general reference (F) which can be adjusted in function operation. This braking device is of the permanent magnet hysteresis type. Any other equivalent device could of course be used. In the illustrated embodiment, this braking device (F) is mounted on the other side of the housing (1) relative to the roller (5). It essentially consists of a fixed body (12) in the form of a cage centered on the axis (5a) of the roller (5), a bearing being interposed between this body (12) and the axis (5a). A disc (13) comprising a hysteresis washer (14) is fixed by means of a screw (15) on the end of the axis (5a). Opposite this disc, is disposed a set of magnets (16) mounted on a ring (17), a ring which can be moved inside the fixed body (12) so as to modify the air gap between the magnets ( 16) and the hysteresis washer (14).

Si pour la plupart des cas, un seul dispositif de freinage associé au premier galet (5) est suffisant, il peut également être envisagé d'associer au deuxième galet (6) voire même également au troisième galet (7), un élé­ment de freinage additionnel non réglable en fonctionne­ment.If in most cases a single braking device associated with the first roller (5) is sufficient, it can also be envisaged to associate with the second roller (6) or even also with the third roller (7), a braking element additional not adjustable in operation.

Par ailleurs, le dispositif conforme à l'invention est de préférence associé à un ensemble permettant d'éliminer les à-coups de tension qui se produisent en amont de l'oeillet (4) d'entrée. Un tel ensemble compen­sateur est constitué essentiellement de deux oeillets additionnels (20,21) disposés à l'entrée du tendeur selon l'axe de défilement XX. L'un des oeillets (21) est monté sur un bras pivotant (voir figure 2) alors que le second est monté fixe sur la base du boitier (1). Deux aimants respectivement (23,24) sont montés l'un sur la base du boitier (1) (aimant (23)), l'autre (24) sur le bras pivo­tant (22). Ces deux aimants sont disposés de telle sorte que leurs faces de même polarité soient en regard l'une de l'autre. De cette manière, le bras (22) a tendance à être repoussé comme illustré à la figure 2 en traits mixtes et, lorsque le fil (3) passe, on forme donc en amont de l'oeillet d'entrée (4) un embarrage variable permettant d'éliminer les à-coups de tension.Furthermore, the device according to the invention is preferably associated with an assembly making it possible to eliminate the voltage surges which occur upstream of the inlet eyelet (4). Such a compensator assembly essentially consists of two additional eyelets (20,21) arranged at the entry of the tensioner along the axis of travel XX. One of the eyelets (21) is mounted on a pivoting arm (see Figure 2) while the second is fixedly mounted on the base of the housing (1). Two magnets respectively (23,24) are mounted one on the base of the housing (1) (magnet (23)), the other (24) on the pivoting arm (22). These two magnets are arranged so their faces of the same polarity are facing each other. In this way, the arm (22) tends to be pushed back as illustrated in FIG. 2 in dashed lines and, when the wire (3) passes, a tie is thus formed upstream of the entry eyelet (4). variable to eliminate voltage surges.

Un tel dispositif tendeur de conception simple et particulièrement efficace, permet d'assurer une tension régulière et constante au fil, sans variation en cours de fonctionnement. De plus, grâce au système de freinage accessible de l'extérieur que comporte l'un des galets, il est possible d'effectuer des réglages en cours de fonctionnement. Un tel dispositif peut être utilisé sur tout type de matériel textile.Such a tensioning device of simple and particularly effective design, makes it possible to ensure a regular and constant tension in the thread, without variation during operation. In addition, thanks to the braking system accessible from the outside that includes one of the rollers, it is possible to make adjustments during operation. Such a device can be used on any type of textile material.

Bien entendu, l'invention n'est pas limitée aux exemples de réalisation, mais elle en couvre toutes les variantes réalisées dans le même esprit.Of course, the invention is not limited to the exemplary embodiments, but it covers all the variants produced in the same spirit.

Claims (8)

1/ Dispositif tendeur de fil du type comportant des galets montés libres en rotation sur un boitier support (1), au moins l'un de ces galets étant soumis à l'action d'un système de freinage à aimant permanent réglable (ou frein magnétique) et le fil (3) lors de son déplacement venant embarrer autour de la périphérie desdits galets, le déplacement du fil en amont et en aval de l'ensemble tendeur étant réalisé selon une direction commune dite "axe de défilement", caractérisé en ce que lesdits ga­lets sont au nombre de trois et sont montés sur le boi­tier support de telle sorte que :
- deux de ces galets (5), (6) dits "galets d'entrée" soient disposés au voisinage de la zone d'introduction du fil, sensiblement de part et d'autre de l'axe de défile­ment, au moins l'un de ces galets comportant un disposi­tif de freinage réglable et leur montage étant réalisé de telle sorte qu'ils soient maintenus en contact tangentiel l'un avec l'autre ;
- le troisième galet (7) dit "galet de sortie" étant quant à lui, positionné en aval des galets précités si l'on suit le trajet du fil, sa surface tangentant avec l'axe de défilement.
1 / Wire tensioning device of the type comprising rollers mounted free in rotation on a support box (1), at least one of these rollers being subjected to the action of a braking system with adjustable permanent magnet (or brake magnetic) and the wire (3) during its movement interlocking around the periphery of said rollers, the movement of the wire upstream and downstream of the tensioner assembly being carried out in a common direction called "axis of travel", characterized in that said rollers are three in number and are mounted on the support box so that:
- two of these rollers (5), (6) called "input rollers" are arranged in the vicinity of the zone of introduction of the wire, substantially on either side of the axis of travel, at least the one of these rollers comprising an adjustable braking device and their mounting being produced so that they are kept in tangential contact with one another;
- The third roller (7) called "output roller" being in turn, positioned downstream of the aforementioned rollers if we follow the path of the wire, its surface tangent to the axis of travel.
2/ Dispositif tendeur selon la revendication 1, caractérisé en ce que les galets d'entrée (5), (6) sont des galets caoutchoutés, le galet de sortie (7) présen­tant, quant à lui, une surface dure (par exemple métal­lique) pour résister aux frottements dus à la torsion.2 / tensioning device according to claim 1, characterized in that the inlet rollers (5), (6) are rubberized rollers, the outlet roller (7) having, for its part, a hard surface (for example metallic ) to resist friction due to torsion. 3/ Dispositif tendeur de fil selon l'une des reven­dications 1 et 2, caractérisé en ce qu'il est associé, au niveau de la zone d'entrée du fil, à un dispositif de prétension (20,21) qui absorbe les à-coups de dévidage et évite qu'ils ne se répercutent en aval.3 / wire tensioning device according to one of claims 1 and 2, characterized in that it is associated, at the level of the wire entry area, with a pretensioning device (20,21) which absorbs the - a lot of unwinding and prevents them from having repercussions downstream. 4/ Dispositif tendeur de fil selon l'une des reven­dication 1 à 3, caractérisé en ce que les trois galets (5,6,7) sont maintenus en contact mutuel, les deuxième (6) et troisième galets (7) étant montés sur le boitier (1) au moyen d'un levier (8) (ou similaire) soumis à l'action d'un moyen de rappel (ressort..).4 / wire tensioning device according to one of claims 1 to 3, characterized in that the three rollers (5,6,7) are maintained in mutual contact, the second (6) and third rollers (7) being mounted on the housing (1) by means of a lever (8) (or the like) subjected to the action of a return means (spring, etc.). 5/ Dispositif tendeur de fil selon l'une des reven­dications 1 à 3, caractérisé en ce que les deux premiers galets (5,6) sont maintenus en contact mutuel, le deu­xième galet (6) étant monté sur le boitier par l'inter­médiaire d'un bras articulé soumis à l'action d'un res­sort de rappel et le troisième galet (7) étant, quant à lui, monté selon un axe fixe sur le boitier.5 / wire tensioning device according to one of claims 1 to 3, characterized in that the first two rollers (5,6) are held in mutual contact, the second roller (6) being mounted on the housing via an articulated arm subjected to the action of a return spring and the third roller (7) being, in turn, mounted along a fixed axis on the housing. 6/ Dispositif tendeur de fil selon l'une des reven­dications 1 à 3, caractérisé en ce que les trois galets (5,6,7) sont maintenus en contact mutuel, les premier et troisième galets étant montés libres en rotation autour d'un axe fixe, le second galet étant, quant à lui, main­tenu en pression contre les deux galets précités par magnétisme à l'aide d'un aimant (ou tout autre système équivalent), le second galet pouvant être soit entière­ment libre et désolidarisé du boitier support, soit monté sur ce boitier par tout système de guidage lui laissant toute liberté pour réaliser son contact avec les deux autres galets.6 / wire tensioning device according to one of claims 1 to 3, characterized in that the three rollers (5,6,7) are maintained in mutual contact, the first and third rollers being mounted free in rotation around a fixed axis, the second roller being, in turn, kept in pressure against the two aforementioned rollers by magnetism using a magnet (or any other equivalent system), the second roller being able to be either completely free and detached from the housing support, or mounted on this unit by any guidance system giving it complete freedom to make contact with the other two rollers. 7/ Dispositif tendeur de fil selon l'une des reven­dications 1 à 6, caractérisé en ce que les moyens de freinage sont associés au galet d'entrée (5) et sont constitués par un corps fixe (12) en forme de cage cen­trée sur l'axe (5a) du galet (5), un roulement étant interposé entre ce corps (12) et l'axe (5a), un disque (13) portant une rondelle d'hysteresis (14) étant fixée par l'intermédiaire d'une vis (15) sur l'extrémité de l'axe (5a), et un jeu d'aimants (16) étant monté en re­gard de cette rondelle d'hysteresis (14) sur une bague (17) qui peut être déplacée à l'intérieur du corps fixe (12) afin de modifier l'entrefer entre les aimants (16) et la rondelle d'hysteresis (14).7 / wire tensioning device according to one of claims 1 to 6, characterized in that the braking means are associated with the input roller (5) and are constituted by a fixed body (12) in the form of a cage centered on the axis (5a) of the roller (5), a bearing being interposed between this body (12) and the axis (5a), a disc (13) carrying a hysteresis washer (14) being fixed by means of a screw (15) on the end of the axis (5a), and a set of magnets (16) being mounted opposite this hysteresis washer (14) on a ring (17 ) which can be moved inside the fixed body (12) in order to modify the air gap between the magnets (16) and the hysteresis washer (14). 8/ Dispositif tendeur de fil selon l'une des reven­dications 3 à 7, caractérisé en ce que le dispositif de prétension disposé au niveau de la zone d'entrée du fil est constitué de deux oeillets additionnels (20,21) dis­posés à l'entrée du tendeur selon l'axe de défilement (XX), l'un des oeillets (21) étant monté sur un bras pivotant (22) alors que le second (20) est monté fixe sur la base du boitier (1), deux aimants respectivement (23,24) étant montés l'un (23) sur la base du boitier (1), l'autre (21) sur le bras pivotant (22), de telle sorte que leurs faces de même polarité soient en regard l'une de l'autre.8 / wire tensioning device according to one of claims 3 to 7, characterized in that the pretensioning device disposed at the level of the thread entry area consists of two additional eyelets (20,21) arranged at the entry of the tensioner along the axis of travel (XX), one of the eyelets (21) being mounted on a pivoting arm (22) while the second (20) is mounted fixed on the base of the housing (1), two magnets respectively (23,24) being mounted one (23) on the base of the housing (1), the other (21) on the pivoting arm (22), so that their faces of the same polarity are opposite one from the other.
EP90420300A 1989-07-18 1990-06-26 Yarn-tensioning device for textile machines Expired - Lifetime EP0409743B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8909917A FR2649965B1 (en) 1989-07-18 1989-07-18 YARN TENSIONER FOR TEXTILE MACHINES
FR8909917 1989-07-18

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EP0409743A1 true EP0409743A1 (en) 1991-01-23
EP0409743B1 EP0409743B1 (en) 1992-05-13

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EP (1) EP0409743B1 (en)
JP (1) JP2723346B2 (en)
DE (1) DE69000101D1 (en)
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FR (1) FR2649965B1 (en)

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FR2673956A1 (en) * 1991-03-14 1992-09-18 Ic Bt Lyon Yarn cabling machine including an improved tension and length regulator assembly

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DE4324412C2 (en) * 1993-07-21 1998-03-19 Mayer Textilmaschf Device for adjusting the thread tension
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FR2167957A5 (en) * 1972-01-12 1973-08-24 Honeywell Inf Systems Magnetic thread tensioner - providing constant thread tension for varying thread dimensions and types and for large humidit
FR2295900A1 (en) * 1974-12-24 1976-07-23 Hacoba Textilmaschinen Tensioning by passing through adjustable roller pair - which are rotated by yarn, one roller being covered with elastic material (BR170876)
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FR2673956A1 (en) * 1991-03-14 1992-09-18 Ic Bt Lyon Yarn cabling machine including an improved tension and length regulator assembly

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Publication number Publication date
DE69000101D1 (en) 1992-06-17
JP2723346B2 (en) 1998-03-09
US5060885A (en) 1991-10-29
EP0409743B1 (en) 1992-05-13
FR2649965A1 (en) 1991-01-25
JPH0351265A (en) 1991-03-05
FR2649965B1 (en) 1991-09-27
ES2031725T3 (en) 1992-12-16

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