EP0138895B1 - Device for driving a rigid wire pressed between two groove rollers - Google Patents

Device for driving a rigid wire pressed between two groove rollers Download PDF

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Publication number
EP0138895B1
EP0138895B1 EP84901199A EP84901199A EP0138895B1 EP 0138895 B1 EP0138895 B1 EP 0138895B1 EP 84901199 A EP84901199 A EP 84901199A EP 84901199 A EP84901199 A EP 84901199A EP 0138895 B1 EP0138895 B1 EP 0138895B1
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EP
European Patent Office
Prior art keywords
pressure
jack
slide
roller
frame
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Expired
Application number
EP84901199A
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German (de)
French (fr)
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EP0138895A1 (en
Inventor
René GRENON
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Individual
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Individual
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Publication of EP0138895A1 publication Critical patent/EP0138895A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/02—Rotary devices, e.g. with helical forwarding surfaces
    • B65H51/04—Rollers, pulleys, capstans, or intermeshing rotary elements
    • B65H51/08—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements
    • B65H51/10—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements with opposed coacting surfaces, e.g. providing nips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B13/00—Bundling articles
    • B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
    • B65B13/22—Means for controlling tension of binding means

Definitions

  • the invention relates to a device for driving in its longitudinal direction a rigid wire moved by two rollers between which it is clamped.
  • Devices of this type are already known, in particular for driving metal wires in many machines, for example in machines for bundling various articles, which are linked together using a stretched metal wire and then knotted by a twist of its ends.
  • the wire is driven by the friction which exists between it and the groove of a drive roller in which it is clamped by a pressure roller.
  • this wire is tightened by the pressure roller with a force which is greater than the product of the resistant driving force by the coefficient of friction of the wire in the groove of the roller engine.
  • the resistance of the wire to the drive is variable, we adopt for safety its maximum foreseeable value to determine the clamping force exerted by the pressure roller. As a result, the device operates frequently with an excessive clamping force which is detrimental to performance and which is the cause of faster wear of the parts.
  • the main object of the invention is to provide a device for driving a rigid wire clamped between two rollers with which the clamping force produced by the pressure roller is constantly maintained at a value just necessary for the proper driving of this wire.
  • a device for driving a rigid wire comprises a pressure roller mounted to rotate freely at a fixed position on a frame; a receiving pulley locked in rotation with a grooved roller cooperating with the pressure roller is mounted to rotate freely on the same frame, a motor group with a driving pulley is supported from this frame, a belt joins this driving pulley and the receiving pulley of the grooved roller, an elastic member exerts on the pivoting arm a force of approach of the grooved roller and the pressure roller in correspondence with a minimum value of the clamping force exerted by the pressure roller on the grooved roller.
  • the receiving pulley and the grooved roller are mounted on an arm pivoting freely relative to the frame and the power unit is supported by a parallelogram articulated relative to the same frame.
  • a jack is arranged between the motor unit and a fixed point of the frame to act in the direction of approaching or moving away from the pressure roller and the grooved roller.
  • the pressure chamber of this jack is connected by a channel to a distributor connected to a hydraulic circuit of fluid under low pressure and to a hydraulic circuit of fluid under high pressure.
  • a drawer mounted in this distributor can occupy a first extreme position putting the cylinder in communication with the fluid circuit under low pressure, a second extreme position putting the cylinder in communication with the fluid circuit under high pressure, a neutral intermediate position isolating the cylinder of both circuits.
  • This drawer is pushed to one of its ends by a relatively weak constant force pressing it by its opposite end against the carrying axis of the receiving pulley.
  • the distributor drawer In the balanced operating position of the assembly, for the drive between the rollers of a wire of a given diameter, the distributor drawer is pressed against the axis of the receiving pulley, however it found in its neutral intermediate position. In this state, the pressure of the fluid in the chamber of the jack is that which corresponds to the tension of the belt just necessary for the proper tightening of the wire driven between the grooved roller and the pressure roller.
  • any variation in the diameter of the wire corresponds to a relative displacement of the grooved roller with respect to the pressure roller, as well as a displacement of the distributor drawer towards one of its extreme positions.
  • the cylinder receives or loses fluid and the motor unit moves relative to the frame until the drawer returns to its neutral intermediate position.
  • the assembly comprising the motor unit, the receiving pulley and the grooved roller is moved relative to the frame, therefore relative to the pressure roller, while the distance between the motor unit and the drive pulley keeps a constant value.
  • a means of counting the number of turns of the grooved roller is incorporated in the device of the invention.
  • This means can be arranged on the grooved roller itself or on any other part rotating at the same time as it, with a constant ratio.
  • the counting means is incorporated in the motor unit.
  • the signals provided by this counting means are useful for monitoring any malfunction: accidental blocking of the device, exit of the wire from its guide, etc., for more precise control of the operation: slowing down before stopping. predetermined thread, as well as for checking the wear of parts and the execution of various. maintenance operations.
  • the device of the invention comprises conventional members which it is not necessary to describe in detail.
  • a pressure roller 2 is mounted to rotate freely, at a fixed location.
  • This roller cooperates for the drive of a rigid wire with a grooved roller 3 on a part 4 of a path 5 for passage of the wire which must be pushed in the direction indicated by an arrow F in FIG. 1.
  • the roller grooved 3 is locked in rotation with a receiving pulley 6 which is connected by a toothed belt 7, or by a chain, to a driving pulley 8 fixed in rotation on the shaft of a power unit 9.
  • This power unit 9 has with the driving pulley 8 a common geometric axis 10; the receiving pulley 6 has with the grooved roller 3 a common geometric axis 11. Between these two geometric axes 10, 11 there is a distance L to which corresponds the normal operating tension of the belt 7.
  • the receiving pulley 6 and the grooved roller 3 are mounted to rotate freely on an axis 12 (coaxial with the geometric axis 11) which is itself carried by an arm 13 mounted to pivot freely at 14, relative to the frame 1.
  • the motor unit 9 and the driving pulley 8 are supported by two branches of an articulated parallelogram itself mounted free in pivoting, at 15 and 16, relative to the frame 1. Consequently, the assembly of the motor group 9, the driving pulleys 8, the receiving pulley 6 and the grooved roller 3 can pivot relative to the pressure roller 2 in a fixed position, without changing the length L between the geometric axes 10, 11 except for slight variations due to operating clearances, bending of the parts, low elasticity of the belt 7.
  • the arm 13 which carries the axis 12 of the grooved roller 3 also supports a lateral extension 17, which is preferably an extension of this axis 12, parallel to the power unit 9. On the latter is fixed, in the direction of the lateral extension 17 , a body 18 which is common to a jack 19 and to a distributor 20.
  • the cylinder 19 is of the single-acting type; it has a piston 21 which comes out to be applied against the frame 1 opposite to a pressure chamber 22 situated on the side of the motor unit 9. It is clear that any higher pressure produced in the chamber 22 of the jack 19 forces the entire motor unit 9, pulleys 8, 6 and the grooved roller 3 to move in the direction of bringing the grooved roller 3 closer to the pressure roller 2. Conversely, any reduction in pressure in the chamber 22 of the cylinder 19 allows the same assembly to move in the direction of the separation of the grooved roller 3 relative to the pressure roller 2. Any constant pressure, to any value, of the fluid inside the chamber 22 of the cylinder 19 is opposed to any additional spacing of the grooved roller 3 and the pressure roller 2. This constant value of the pressure may be zero. Any increase in this spacing is made impossible except to the extent permitted by the operating clearances, the seepage of the fluid, the “compressibility of this fluid although it is a theoretically incompressible hydraulic fluid.
  • the value of the constant pressure in the jack 19 determines the force with which the two rollers 3 and 2 are applied against each other, empty, in the absence of wire between them. If a pressure of low value but insufficient to produce the necessary force is chosen, for a reason which will appear later, the two rollers 3 and 2 are kept in contact using a tension spring 23 arranged for example between the frame 1 and the free terminal end of the arm 13 which is extended above the axis 12 of the receiving pulley 6.
  • the chamber 22 of the jack 19 communicates by a T-shaped channel 24 formed in the piston 21 with a corresponding channel 25 drilled in the distributor 20, and leading to an internal volume 26.
  • the latter is traversed by a distribution drawer 27 (FIG. 3 ) which has an end portion 28 playing the role of a piston in a jack 29 so that its opposite end 30 is constantly held applied against the free end of an adjustment screw 31. This is screwed in the extension side 17, towards the power unit 9.
  • a channel 32 of a fluid under low pressure and a channel 33 of a fluid under high pressure arrives via a pipe 34 which is also joined by a channel 35 to the jack 29.
  • the drawer 27 In its middle part located between the channels 32, 33, the drawer 27 has a diametrical narrowing 36. It can occupy three positions. In a first extreme position, it discovers the channel 32 and allows the fluid of the pressure chamber 22 of the jack 19 to pass from the channel 25 to the channel 32 using the T-channel 24. In a second extreme position, the drawer 27 discovers the channel 33 and allows the pressurized fluid to pass from the channel 33 to the channel 25 then into the pressure chamber 22 of the jack 19. In an intermediate position or neutral position, at which it is found in FIGS. 1 and 3, the drawer 27 closes the channels 32 and 33 so that it isolates the chamber 22 of the jack 19 from these channels.
  • the device of the invention operates as follows.
  • the adjustment is made, using the adjusting screw 31, as a function of the pressure chosen to be constant in the pressure chamber 22 of the jack 19, so that the center distance L is at its normal value and that the distributor 27 is in its neutral position.
  • the spring 23 applies the rollers 2, 3 against each other with a force which can be weak enough so that the introduction between them of a wire pushed by hand can be done easily.
  • the tension exerted by the belt 7 tends to decrease while bringing the roller 3 closer to the roller 2, which corresponds to a displacement of the mobile assembly during which the drawer 27 which is stopped by the screw 31 against which it is pushed by its jack 29 undergoes a relative displacement towards its second extreme position. It puts the chamber 22 of the jack 19 into communication with the channel 33 and the high pressure circuit, so that the piston 21 remains pressed against the frame 1 and that the pressurized fluid contributes to the movement in progress. This movement is interrupted when the drawer 27 is again in its neutral position. In other words, the slide 27 is disturbed from its neutral intermediate position each time the distance L between the geometric axes 10, 11 tends to take another value. It is disturbed in a direction such that it intervenes on the fluid contained in the jack 19 in a corrective manner. The jack 19 then acts in the direction of restoring the distance L of this center distance.
  • the weight of the power unit 9 does not intervene; it is negligible in comparison with the tensile force exerted by the belt 7.
  • the device can therefore operate in any position.
  • the direction of rotation of the rollers 2, 3 also has no influence on the state of equilibrium of the device, so that the latter operates equally in the two directions of advance and retreat of the driven wire.
  • the support of the piston 21 against the frame is established automatically in direct proportion to the dynamic tension of the belt, however the center distance L keeps a constant value since the position in equilibrium of the piston 21 in the movable assembly is always the same.
  • two stop screws 38, 29 are mounted on the body 18 of the jack 19 and of the distributor 27 which are arranged to cooperate, in opposite directions, with corresponding stop faces 40, 41 provided on the lateral extension 17 of axis 12.
  • the position adjustment which is automatically established at the necessary value means that the parts of the device are not subjected to unnecessarily exaggerated stresses and that no sliding is to be feared. Consequently, it is possible and advantageous, within the framework of the invention, to incorporate into the device a means of counting the number of revolutions of the grooved roller, or of a rotating part with which it is linked in rotation, as the motor unit 9. This means can be of any type known per se. It brings considerable advantages to the use of the device of the invention. At a given diameter of the entrained wire, the length of the wire effectively displaced corresponds to a determined number of turns of the grooved roller 3.
  • the drawer 27 of the distributor 20 could be pushed by a spring replacing the jack 29. In this case, its position could be more easily reversed, its end 30 being held pressed against the motor unit 9 and the spring being interposed between the extension 17 and the drawer 27.
  • the jack 19 could be of the double-acting type and supplied accordingly by an appropriate distributor so that it plays the role described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
  • Manipulator (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

The assembly comprising a motor unit (9), the driving pulley (8), the take-up pulley (6), the movable groove roller (3) is pivotingly mounted with respect to the fixed pressure roller (2) by means of a jack (19) of which the piston (21) bears against the frame (1) under the control of a distributor (20) of which the slide (27) is servo controlled to the variations with respect to a constant value (L) of the distance between the axis (10) of the motor unit (9) and the axis (11) of the take-up pulley (6), so that the pressure exerted on the wire is automatically adjusted to the required value.

Description

L'invention a pour objet un dispositif d'entraînement dans son sens longitudinal d'un fil rigide mû par deux galets entre lesquels il est serré.The invention relates to a device for driving in its longitudinal direction a rigid wire moved by two rollers between which it is clamped.

On connaît déjà des dispositifs de ce type, notamment pour l'entraînement des fils métalliques dans de nombreuses machines, par exemple dans les machines à botteler divers articles, qui sont liés ensemble à l'aide d'un fil métallique tendu et noué ensuite par une torsade de ses extrémités.Devices of this type are already known, in particular for driving metal wires in many machines, for example in machines for bundling various articles, which are linked together using a stretched metal wire and then knotted by a twist of its ends.

Le fil est entraîné par la friction qui existe entre lui et la gorge d'un galet moteur dans laquelle il est serré par un galet presseur. Afin d'éviter tout risque de patinage du galet moteur sur le fil, ce fil est serré par le galet presseur avec une force qui est supérieure au produit de la force résistante d'entraînement par le coefficient de frottement du fil dans la gorge du galet moteur. Comme la résistance du fil à l'entraînement est variable, on adopte par sécurité sa valeur maximum prévisible pour déterminer la force de serrage exercée par le galet presseur. Il en résulte que le dispositif fonctionne fréquemment avec une force de serrage excessive qui est nuisible au rendement et qui est la cause d'une usure plus rapide des pièces.The wire is driven by the friction which exists between it and the groove of a drive roller in which it is clamped by a pressure roller. In order to avoid any risk of slipping of the driving roller on the wire, this wire is tightened by the pressure roller with a force which is greater than the product of the resistant driving force by the coefficient of friction of the wire in the groove of the roller engine. As the resistance of the wire to the drive is variable, we adopt for safety its maximum foreseeable value to determine the clamping force exerted by the pressure roller. As a result, the device operates frequently with an excessive clamping force which is detrimental to performance and which is the cause of faster wear of the parts.

L'invention a pour but principal d'apporter un dispositif d'entraînement d'un fil rigide serré entre deux galets avec lequel la force de serrage produite par le galet presseur est constamment maintenue à une valeur juste nécessaire à l'entraînement convenable de ce fil.The main object of the invention is to provide a device for driving a rigid wire clamped between two rollers with which the clamping force produced by the pressure roller is constantly maintained at a value just necessary for the proper driving of this wire.

Dans une machine connue du commerce un dispositif d'entraînement d'un fil rigide comprend un galet presseur monté libre en rotation à une position fixe sur un bâti ; une poulie réceptrice calée en rotation avec un galet à gorge coopérant avec le galet presseur est montée libre en rotation sur le même bâti, un groupe moteur à poulie motrice est supporté à partir de ce bâti, une courroie réunit cette poulie motrice et la poulie réceptrice du galet à gorge, un organe élastique exerce sur le bras pivotant une force de rapprochement du galet à gorge et du galet presseur en correspondance avec une valeur minimum de la force de serrage exercée par le galet presseur sur le galet à gorge.In a machine known in the art, a device for driving a rigid wire comprises a pressure roller mounted to rotate freely at a fixed position on a frame; a receiving pulley locked in rotation with a grooved roller cooperating with the pressure roller is mounted to rotate freely on the same frame, a motor group with a driving pulley is supported from this frame, a belt joins this driving pulley and the receiving pulley of the grooved roller, an elastic member exerts on the pivoting arm a force of approach of the grooved roller and the pressure roller in correspondence with a minimum value of the clamping force exerted by the pressure roller on the grooved roller.

Selon l'invention, la poulie réceptrice et le galet à gorge sont montés sur un bras pivotant librement par rapport au bâti et le groupe moteur est supporté par un parallélogramme articulé par rapport au même bâti. En outre, un vérin est disposé entre le groupe moteur et un point fixe du bâti pour agir dans le sens du rapprochement ou de l'éloignement du galet presseur et du galet à gorge. La chambre de pression de- ce vérin est réunie par un canal à un distributeur raccordé à un circuit hydraulique de fluide sous pression faible et à un circuit hydraulique de fluide sous pression élevée. Un tiroir monté dans ce distributeur peut occuper une première position extrême mettant en communication le vérin avec le circuit de fluide sous pression faible, une seconde position extrême mettant en communication le vérin avec le circuit de fluide sous pression élevée, une position intermédiaire neutre isolant le vérin de l'un et l'autre circuit. Ce tiroir est poussé à une de ses extrémités par une force constante relativement faible le mettant en appui par son extrémité opposée contre l'axe porteur de la poulie réceptrice.According to the invention, the receiving pulley and the grooved roller are mounted on an arm pivoting freely relative to the frame and the power unit is supported by a parallelogram articulated relative to the same frame. In addition, a jack is arranged between the motor unit and a fixed point of the frame to act in the direction of approaching or moving away from the pressure roller and the grooved roller. The pressure chamber of this jack is connected by a channel to a distributor connected to a hydraulic circuit of fluid under low pressure and to a hydraulic circuit of fluid under high pressure. A drawer mounted in this distributor can occupy a first extreme position putting the cylinder in communication with the fluid circuit under low pressure, a second extreme position putting the cylinder in communication with the fluid circuit under high pressure, a neutral intermediate position isolating the cylinder of both circuits. This drawer is pushed to one of its ends by a relatively weak constant force pressing it by its opposite end against the carrying axis of the receiving pulley.

Dans la position de marche en état équilibré de l'ensemble, pour l'entraînement entre les galets d'un fil d'un diamètre donné, le tiroir du distributeur est appuyé contre l'axe de la poulie réceptrice, cependant qu'il se trouve à sa position intermédiaire neutre. Dans cet état, la pression du fluide dans la chambre du vérin est celle qui correspond à la tension de la courroie juste nécessaire au serrage convenable du fil entraîné entre le galet à gorge et le galet presseur.In the balanced operating position of the assembly, for the drive between the rollers of a wire of a given diameter, the distributor drawer is pressed against the axis of the receiving pulley, however it found in its neutral intermediate position. In this state, the pressure of the fluid in the chamber of the jack is that which corresponds to the tension of the belt just necessary for the proper tightening of the wire driven between the grooved roller and the pressure roller.

A toute variation du diamètre du fil correspond un déplacement relatif du galet à gorge par rapport au galet presseur, ainsi qu'un déplacement du tiroir du distributeur vers l'une de ses positions extrêmes. Il en résulte que le vérin reçoit ou perd du fluide et que le groupe moteur se déplace par rapport au bâti jusqu'à ce que le tiroir retrouve sa position intermédiaire neutre. Ainsi l'ensemble comprenant le groupe moteur, la poulie réceptrice et le galet à gorge est déplacé par rapport au bâti, donc par rapport au galet presseur, cependant que l'entraxe entre le groupe moteur et la poulie motrice garde une valeur constante.Any variation in the diameter of the wire corresponds to a relative displacement of the grooved roller with respect to the pressure roller, as well as a displacement of the distributor drawer towards one of its extreme positions. As a result, the cylinder receives or loses fluid and the motor unit moves relative to the frame until the drawer returns to its neutral intermediate position. Thus the assembly comprising the motor unit, the receiving pulley and the grooved roller is moved relative to the frame, therefore relative to the pressure roller, while the distance between the motor unit and the drive pulley keeps a constant value.

Selon un perfectionnement supplémentaire, un moyen de comptage du nombre de tours du galet à gorge est incorporé au dispositif de l'invention. Ce moyen peut être disposé sur le galet à gorge lui-même ou sur toute autre pièce tournant en même temps que lui, avec un rapport constant. De préférence, le moyen de comptage est incorporé au groupe moteur. Les signaux fournis par ce moyen de comptage sont utiles pour la surveillance de tout défaut de fonctionnement : blocage accidentel du dispositif, sortie du fil hors de son guide, etc., pour une commande plus précise de la marche : ralentissement préalable à l'arrêt prédéterminé du fil, ainsi que pour le contrôle de l'usure des pièces et l'exécution de diverses . opérations d'entretien.According to an additional improvement, a means of counting the number of turns of the grooved roller is incorporated in the device of the invention. This means can be arranged on the grooved roller itself or on any other part rotating at the same time as it, with a constant ratio. Preferably, the counting means is incorporated in the motor unit. The signals provided by this counting means are useful for monitoring any malfunction: accidental blocking of the device, exit of the wire from its guide, etc., for more precise control of the operation: slowing down before stopping. predetermined thread, as well as for checking the wear of parts and the execution of various. maintenance operations.

On donnera maintenant, sans intention limitative et sans exclure aucune variante, une description d'un exemple de réalisation. On se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une vue en coupe par un plan passant par l'axe du fil entraîné et par le plan médian du galet presseur et du galet à gorge d'un dispositif d'entraînement de fil conforme à l'invention,
  • la figure 2 est une vue en coupe selon II-II de la figure 1,
  • la figure 3 est une vue en coupe selon III-III de la figure 2.
We will now give, without limiting intention and without excluding any variant, a description of an exemplary embodiment. Reference is made to the accompanying drawings in which:
  • FIG. 1 is a view in section through a plane passing through the axis of the driven wire and through the median plane of the pressure roller and the grooved roller of a wire drive device according to the invention,
  • FIG. 2 is a sectional view along II-II of FIG. 1,
  • FIG. 3 is a sectional view along III-III of FIG. 2.

Le dispositif de l'invention comprend des organes classiques qu'il n'est pas nécessaire de décrire en détail.The device of the invention comprises conventional members which it is not necessary to describe in detail.

Sur un bâti général 1, un galet presseur 2 est monté libre en rotation, à un emplacement fixe. Ce galet coopère pour l'entraînement d'un fil rigide avec un galet à gorge 3 sur une partie 4 d'un chemin de passage 5 du fil qui doit être poussé dans le sens indiqué par une flèche F sur la figure 1. Le galet à gorge 3 est calé en rotation avec une poulie réceptrice 6 qui est reliée par une courroie crantée 7, ou par une chaîne, à une poulie motrice 8 calée en rotation sur l'arbre d'un groupe moteur 9. Ce groupe moteur 9 a avec la poulie motrice 8 un axe géométrique commun 10 ; la poulie réceptrice 6 a avec le galet à gorge 3 un axe géométrique commun 11. Entre ces deux axes géométriques 10, 11 il existe une distance L à laquele correspond la tension normale de fonctionnement de la courroie 7.On a general frame 1, a pressure roller 2 is mounted to rotate freely, at a fixed location. This roller cooperates for the drive of a rigid wire with a grooved roller 3 on a part 4 of a path 5 for passage of the wire which must be pushed in the direction indicated by an arrow F in FIG. 1. The roller grooved 3 is locked in rotation with a receiving pulley 6 which is connected by a toothed belt 7, or by a chain, to a driving pulley 8 fixed in rotation on the shaft of a power unit 9. This power unit 9 has with the driving pulley 8 a common geometric axis 10; the receiving pulley 6 has with the grooved roller 3 a common geometric axis 11. Between these two geometric axes 10, 11 there is a distance L to which corresponds the normal operating tension of the belt 7.

Selon l'invention, la poulie réceptrice 6 et le galet à gorge 3 sont montés libres en rotation sur un axe 12 (coaxial à l'axe géométrique 11) qui est lui-même porté par un bras 13 monté libre en pivotement en 14, par rapport au bâti 1. Le groupe moteur 9 et la poulie motrice 8 sont supportés par deux branches d'un parallélogramme articulé monté lui-même libre en pivotement, en 15 et 16, par rapport au bâti 1. Par conséquent, l'ensemble du goupe moteur 9, des poulies motrice 8, réceptrice 6 et du galet à gorge 3 peut pivoter par rapport au galet presseur 2 à position fixe, sans que change la longueur L entre les axes géométriques 10, 11 à l'exception des faibles variations dues aux jeux de fonctionnement, aux flexions des pièces, à la faible élasticité de la courroie 7.According to the invention, the receiving pulley 6 and the grooved roller 3 are mounted to rotate freely on an axis 12 (coaxial with the geometric axis 11) which is itself carried by an arm 13 mounted to pivot freely at 14, relative to the frame 1. The motor unit 9 and the driving pulley 8 are supported by two branches of an articulated parallelogram itself mounted free in pivoting, at 15 and 16, relative to the frame 1. Consequently, the assembly of the motor group 9, the driving pulleys 8, the receiving pulley 6 and the grooved roller 3 can pivot relative to the pressure roller 2 in a fixed position, without changing the length L between the geometric axes 10, 11 except for slight variations due to operating clearances, bending of the parts, low elasticity of the belt 7.

Le bras 13 qui porte l'axe 12 du galet à gorge 3 supporte aussi un prolongement latéral 17, qui est de préférence une extension de cet axe 12, parallèlement au groupe moteur 9. Sur ce dernier est fixé, en direction du prolongement latéral 17, un corps 18 qui est commun à un vérin 19 et à un distributeur 20.The arm 13 which carries the axis 12 of the grooved roller 3 also supports a lateral extension 17, which is preferably an extension of this axis 12, parallel to the power unit 9. On the latter is fixed, in the direction of the lateral extension 17 , a body 18 which is common to a jack 19 and to a distributor 20.

Le vérin 19 est du type à simple effet ; il a un piston 21 qui sort pour s'appliquer contre le bâti 1 à l'opposé d'une chambre de pression 22 située du côté du groupe moteur 9. Il est clair que toute pression plus forte réalisée dans la chambre 22 du vérin 19 oblige l'ensemble du groupe moteur 9, des poulies 8, 6 et du galet à gorge 3 à se déplacer dans le sens d'un rapprochement du galet à gorge 3 vers le galet presseur 2. Inversement, toute diminution de pression dans la chambre 22 du vérin 19 permet au même ensemble de se déplacer dans le sens de l'éloignement du galet à gorge 3 par rapport au galet presseur 2. Toute pression constante, à une valeur quelconque, du fluide à l'intérieur de la chambre 22 du vérin 19 s'oppose à tout écartement supplémentaire du galet à gorge 3 et du galet presseur 2. Cette valeur constante de la pression peut être nulle. Tout accroissement de cet écartement est rendu impossible sauf dans la mesure permise par les jeux de fonctionnement, les suintements du fluide, la « compressibilité de ce fluide bien qu'il s'agisse d'un fluide hydraulique théoriquement incompressible.The cylinder 19 is of the single-acting type; it has a piston 21 which comes out to be applied against the frame 1 opposite to a pressure chamber 22 situated on the side of the motor unit 9. It is clear that any higher pressure produced in the chamber 22 of the jack 19 forces the entire motor unit 9, pulleys 8, 6 and the grooved roller 3 to move in the direction of bringing the grooved roller 3 closer to the pressure roller 2. Conversely, any reduction in pressure in the chamber 22 of the cylinder 19 allows the same assembly to move in the direction of the separation of the grooved roller 3 relative to the pressure roller 2. Any constant pressure, to any value, of the fluid inside the chamber 22 of the cylinder 19 is opposed to any additional spacing of the grooved roller 3 and the pressure roller 2. This constant value of the pressure may be zero. Any increase in this spacing is made impossible except to the extent permitted by the operating clearances, the seepage of the fluid, the “compressibility of this fluid although it is a theoretically incompressible hydraulic fluid.

La valeur de la pression constante dans le vérin 19 détermine la force avec laquelle les deux galets 3 et 2 sont appliqués l'un contre l'autre, à vide, en l'absence de fil entre eux. Si on choisit une pression de valeur faible mais insuffisante à produire la force nécessaire, pour une raison qui apparaîtra plus loin, on maintient les deux galets 3 et 2 en contact à l'aide d'un ressort de traction 23 disposé par exemple entre le bâti 1 et l'extrémité terminale libre du bras 13 que l'on prolonge au-dessus de l'axe 12 de la poulie réceptrice 6.The value of the constant pressure in the jack 19 determines the force with which the two rollers 3 and 2 are applied against each other, empty, in the absence of wire between them. If a pressure of low value but insufficient to produce the necessary force is chosen, for a reason which will appear later, the two rollers 3 and 2 are kept in contact using a tension spring 23 arranged for example between the frame 1 and the free terminal end of the arm 13 which is extended above the axis 12 of the receiving pulley 6.

La chambre 22 du vérin 19 communique par un canal en T 24 ménagé dans le piston 21 avec un canal 25 correspondant percé dans le distributeur 20, et aboutissant à un volume interne 26. Ce dernier est traversé par un tiroir de distribution 27 (figure 3) qui a une partie extrême 28 jouant le rôle d'un piston dans un vérin 29 de sorte que son extrémité opposée 30 est constamment tenue appliquée contre l'extrémité libre d'une vis de réglage 31. Celle-ci est vissée dans le prolongement latéral 17, en direction du groupe moteur 9.The chamber 22 of the jack 19 communicates by a T-shaped channel 24 formed in the piston 21 with a corresponding channel 25 drilled in the distributor 20, and leading to an internal volume 26. The latter is traversed by a distribution drawer 27 (FIG. 3 ) which has an end portion 28 playing the role of a piston in a jack 29 so that its opposite end 30 is constantly held applied against the free end of an adjustment screw 31. This is screwed in the extension side 17, towards the power unit 9.

Dans les parties extrêmes opposées du volume interne 26 débouchent respectivement un canal 32 d'un fluide sous pression faible et un canal 33 d'un fluide sous pression élevée. Ce dernier arrive par une canalisation 34 qui est réunie aussi par un canal 35 au vérin 29.In the opposite end portions of the internal volume 26 respectively open a channel 32 of a fluid under low pressure and a channel 33 of a fluid under high pressure. The latter arrives via a pipe 34 which is also joined by a channel 35 to the jack 29.

Dans sa partie médiane située entre les canaux 32, 33, le tiroir 27 présente un rétrécissement diamétral 36. Il peut occuper trois positions. Dans une première position extrême, il découvre le canal 32 et permet au fluide de la chambre à pression 22 du vérin 19 de passer du canal 25 au canal 32 en empruntant le canal en T 24. Dans une seconde position extrême, le tiroir 27 découvre le canal 33 et permet au fluide sous pression de passer du canal 33 au canal 25 puis dans la chambre à pression 22 du vérin 19. Dans une position intermédiaire ou position neutre, à laquelle il se trouve sur les figures 1 et 3, le tiroir 27 obture les canaux 32 et 33 de sorte qu'il isole la chambre 22 du vérin 19 de ces canaux.In its middle part located between the channels 32, 33, the drawer 27 has a diametrical narrowing 36. It can occupy three positions. In a first extreme position, it discovers the channel 32 and allows the fluid of the pressure chamber 22 of the jack 19 to pass from the channel 25 to the channel 32 using the T-channel 24. In a second extreme position, the drawer 27 discovers the channel 33 and allows the pressurized fluid to pass from the channel 33 to the channel 25 then into the pressure chamber 22 of the jack 19. In an intermediate position or neutral position, at which it is found in FIGS. 1 and 3, the drawer 27 closes the channels 32 and 33 so that it isolates the chamber 22 of the jack 19 from these channels.

Le dispositif de l'invention fonctionne de la façon suivante.The device of the invention operates as follows.

Le réglage est fait, à l'aide de la vis de réglage 31, en fonction de la pression choisie pour être constante dans la chambre de pression 22 du vérin 19, de façon que l'entraxe L se trouve à sa valeur normale et que le distributeur 27 se trouve à sa position neutre. Au repos, le ressort 23 applique les galets 2, 3 l'un contre l'autre avec une force qui peut être assez faible pour que l'introduction entre eux d'un fil poussé à la main puisse se faire facilement.The adjustment is made, using the adjusting screw 31, as a function of the pressure chosen to be constant in the pressure chamber 22 of the jack 19, so that the center distance L is at its normal value and that the distributor 27 is in its neutral position. At rest, the spring 23 applies the rollers 2, 3 against each other with a force which can be weak enough so that the introduction between them of a wire pushed by hand can be done easily.

Dès qu'un fil est engagé entre les galets 2, 3, ou ultérieurement quand un fil déjà engagé a un diamètre qui devient plus gros, la traction créée par le galet à gorge 3 et par la courroie 7 devient plus forte et l'ensemble mobile défini plus haut se déplace nécessairement dans.le sens de l'écartement des galets 2, 3. Dès le début de ce mouvement, le tiroir 27 qui est arrêté par la vis 31 contre laquelle il est poussé par son vérin 29 subit un déplacement relatif vers sa première position extrême. Il en résulte que le vérin 19 est mis en communication avec la canalisation 32, de sorte qu'il perd rapidement de son fluide. Ceci autorise le déplacement en cours jusqu'à ce que la position neutre du tiroir 27 soit 'rétablie. L'ensemble mobile est arrêté contre tout recul correspondant à l'écartement des galets 2, 3 par le fluide contenu dans la chambre 22.As soon as a wire is engaged between the rollers 2, 3, or later when a wire already engaged has a diameter which becomes larger, the traction created by the grooved roller 3 and by the belt 7 becomes stronger and the whole mobile defined above necessarily moves in the direction of the spacing of the rollers 2, 3. From the start of this movement, the slide 27 which is stopped by the screw 31 against which it is pushed by its cylinder 29 undergoes a relative displacement towards its first extreme position. As a result, the cylinder 19 is placed in communication with the pipe 32, so that it rapidly loses its fluid. This authorizes the movement in progress until the neutral position of the drawer 27 is restored. The mobile assembly is stopped against any recoil corresponding to the spacing of the rollers 2, 3 by the fluid contained in the chamber 22.

Si le fil engagé a un diamètre qui devient plus faible, la tension qu'exerce la courroie 7 tend à diminuer tout en rapprochant le galet 3 du galet 2, ce qui correspond à un déplacement de l'ensemble mobile pendant lequel le tiroir 27 qui est arrêté par la vis 31 contre laquelle il est poussé par son vérin 29 subit un déplacement relatif vers sa deuxième position extrême. Il met en communication la chambre 22 du vérin 19 avec le canal 33 et le circuit à pression élevée, de sorte que le piston 21 reste appuyé contre le bâti 1 et que le fluide sous pression contribue au déplacement en cours. Ce mouvement s'interrompt quand le tiroir 27 se trouve à nouveau à sa position neutre. Autrement dit, le tiroir 27 est dérangé de sa position intermédiaire neutre chaque fois que la distance L entre les axes géométriques 10, 11 tend à prendre une autre valeur. Il est dérangé dans un sens tel qu'il intervient sur le fluide contenu dans le vérin 19 de manière correctrice. Le vérin 19 agit alors dans le sens du rétablissement de la distance L de cet entraxe.If the thread engaged has a diameter which becomes smaller, the tension exerted by the belt 7 tends to decrease while bringing the roller 3 closer to the roller 2, which corresponds to a displacement of the mobile assembly during which the drawer 27 which is stopped by the screw 31 against which it is pushed by its jack 29 undergoes a relative displacement towards its second extreme position. It puts the chamber 22 of the jack 19 into communication with the channel 33 and the high pressure circuit, so that the piston 21 remains pressed against the frame 1 and that the pressurized fluid contributes to the movement in progress. This movement is interrupted when the drawer 27 is again in its neutral position. In other words, the slide 27 is disturbed from its neutral intermediate position each time the distance L between the geometric axes 10, 11 tends to take another value. It is disturbed in a direction such that it intervenes on the fluid contained in the jack 19 in a corrective manner. The jack 19 then acts in the direction of restoring the distance L of this center distance.

On remarquera que le poids du groupe moteur 9 n'intervient pas ; il est négligeable en comparaison de la force de traction qu'exerce la courroie 7. Le dispositif peut donc fonctionner en toutes positions. Le sens de rotation des galets 2, 3 n'a pas non plus d'influence sur l'état d'équilibre du dispositif, de sorte que celui-ci fonctionne pareillement dans les deux sens d'avance et de recul du fil entraîné. L'appui du piston 21 contre le bâti s'établit automatiquement en proportion directe de la tension dynamique de la courroie cependant que l'entraxe L garde une valeur constante puisque la position en état d'équilibre du piston 21 dans l'ensemble mobile est toujours la même.It will be noted that the weight of the power unit 9 does not intervene; it is negligible in comparison with the tensile force exerted by the belt 7. The device can therefore operate in any position. The direction of rotation of the rollers 2, 3 also has no influence on the state of equilibrium of the device, so that the latter operates equally in the two directions of advance and retreat of the driven wire. The support of the piston 21 against the frame is established automatically in direct proportion to the dynamic tension of the belt, however the center distance L keeps a constant value since the position in equilibrium of the piston 21 in the movable assembly is always the same.

Il est souvent utile de maintenir de façon certaine le déplacement relatif du groupe moteur 9 par rapport à la poulie motrice 6 dans les limites admises de l'entraxe L, dans les deux sens ; dans ce cas, on monte sur le corps 18 du vérin 19 et du distributeur 27 deux vis de butée 38, 29 qui sont disposées pour coopérer, en sens opposés, avec des faces de butée correspondantes 40, 41 prévues sur le prolongement latéral 17 de l'axe 12.It is often useful to maintain the relative displacement of the power unit 9 relative to the driving pulley 6 within the allowed limits of the center distance L, in both directions; in this case, two stop screws 38, 29 are mounted on the body 18 of the jack 19 and of the distributor 27 which are arranged to cooperate, in opposite directions, with corresponding stop faces 40, 41 provided on the lateral extension 17 of axis 12.

L'ajustement de position qui s'établit automatiquement à la valeur nécessaire fait que les pièces du dispositif ne sont pas soumises à des contraintes inutilement exagérées et qu'aucun glissement n'est à craindre. Par conséquent, il est possible et avantageux, dans le cadre de l'invention, d'incorporer au dispositif un moyen de comptage du nombre de tours du galet à gorge, ou d'une pièce tournante avec laquelle elle est liée en rotation, comme le groupe moteur 9. Ce moyen peut être d'un type quelconque connu en soi. Il apporte des avantages considérables à l'emploi du dispositif de l'invention. A un diamètre donné du fil entraîné, la longueur du fil effectivement déplacé correspond à un nombre de tours déterminé du galet à gorge 3. On peut donc contrôler la longueur du fil fourni par le dispositif ; on peut aussi prévoir un ralentissement avant un arrêt total pour fournir une longueur plus précise. De plus, l'usure de la gorge du galet 3 entraîne un nombre de tours plus grand pour une même longueur d'un même fil. Par conséquent, le nombre moyen de tours d'une même opération répétée (afin d'éviter les causes accidentelles de variation) donne une indication sur l'usure et permet de programmer l'entretien du dispositif ou celui d'organes d'une autre machine alimentée par le dispositif et dans laquelle l'usure crée progressivement l'emploi d'une longueur croissante de fil.The position adjustment which is automatically established at the necessary value means that the parts of the device are not subjected to unnecessarily exaggerated stresses and that no sliding is to be feared. Consequently, it is possible and advantageous, within the framework of the invention, to incorporate into the device a means of counting the number of revolutions of the grooved roller, or of a rotating part with which it is linked in rotation, as the motor unit 9. This means can be of any type known per se. It brings considerable advantages to the use of the device of the invention. At a given diameter of the entrained wire, the length of the wire effectively displaced corresponds to a determined number of turns of the grooved roller 3. It is therefore possible to control the length of the wire supplied by the device; we can also provide a slowdown before a complete stop to provide a more precise length. In addition, the wear of the groove of the roller 3 results in a greater number of turns for the same length of the same wire. Consequently, the average number of revolutions of the same repeated operation (in order to avoid accidental causes of variation) gives an indication of the wear and allows programming of the maintenance of the device or that of organs of another machine powered by the device and in which wear gradually creates the use of an increasing length of wire.

L'exemple décrit ci-dessus est susceptible de recevoir plusieurs modifications ou variantes qui ne sortent pas du cadre de l'invention. Par exemple, le tiroir 27 du distributeur 20 pourrait être poussé par un ressort remplaçant le vérin 29. Dans ce cas, sa position pourrait être plus facilement inversée, son extrémité 30 étant tenue appliquée contre le groupe moteur 9 et le ressort se trouvant interposé entre l'extension 17 et le tiroir 27. Le vérin 19 pourrait être du type à double effet et alimenté en conséquence par un distributeur approprié pour qu'il joue le rôle décrit plus haut.The example described above is capable of receiving several modifications or variants which do not depart from the scope of the invention. For example, the drawer 27 of the distributor 20 could be pushed by a spring replacing the jack 29. In this case, its position could be more easily reversed, its end 30 being held pressed against the motor unit 9 and the spring being interposed between the extension 17 and the drawer 27. The jack 19 could be of the double-acting type and supplied accordingly by an appropriate distributor so that it plays the role described above.

Claims (9)

1. A device for driving a rigid wire, comprising a pressure roller (2) mounted to rotate freely on a frame (1), a grooved roller (3) which cooperates with the pressure roller (2) for driving the wire and is mounted to rotate freely on a shaft (12) and is keyed to rotate with a receiver pulley (6), a belt (7) connecting the latter to a driving pulley (8) on a motor unit (9), an elastic member (23) which tends to bring the two rollers (2, 3) to bear against one another, characterized in that the receiver pulley (6) and the grooved roller (3) are mounted on an arm (13) which pivots freely with respect to the frame (1), the motor unit (9) is mounted on a hinged parallelogram which pivots freely with respect to the frame (1), a jack (19) is arranged between the frame (1) and the motor unit (9) in order to act by its piston (21) against the frame (1) in the direction to bring the rollers (2, 3) towards or away from one another, this jack (19) being connected operationally by way of a regulator (20) to a hydraulic circuit of low-pressure fluid or to a hydraulic circuit of high-pressure fluid, this regulator (20) having a movable slide (27) the relative position of which is determined by the distance separating the geometric axis (10) of the motor unit (9) from the geometric axis (11) of the receiver pulley (6), the neutral position of this slide (27) corresponding with a predetermined value (L) of this centre-distance (10, 11).
2. A device as in Claim 1, characterized in that the regulator (20) is interposed between the motor unit (6) and a lateral extension (17) carried by the pivoting arm (13) which carries the receiver pulley (6) and the grooved roller (3), one end portion (28) of the slide (27) being constantly subjected to a force which thrusts the said slide into contact with one or other of the two components, the motor unit (9) and the lateral extension (17).
3. A device as in Claim 2, characterized in that the lateral extension (17) is that of the shaft (12) of the grooved roller (3) and the slide (27) is held in contact against an adjusting screw (31) screwed into this lateral extension (17).
4. A device as in Claim 1, characterized in that the jack (19) is of single-acting type and when the slide (27) is in its neutral position the pressure chamber (22) of the said jack (19) is closed so that its piston (21) being held applied against the frame (1) opposes any movement which tends to separate the rollers (2, 3) from one another.
5. A device as in Claim 4, characterized in that the pressure chamber (22) contains a fluid at a pressure of sufficient value to apply the rollers (2. 3) against one another in the absence of wire between them.
6. A device as in Claim 4, characterized in that the pressure chamber (22) contains a fluid at a pressure of insufficient value to apply the rollers (2, 3) against one another in the absence of wire between them, a spring (23) being then arranged between the frame (1) and the pivoting arm (13) in order to produce the coming together.
7. A device as in Claim 4, characterized in that the slide (27) may occupy on opposite sides of its neutral position a first end position in which it puts the chamber (22) of the jack (19) into communication with a channel (32) of the circuit' of low-pressure fluid and a second end position in which it puts the said chamber (22) into communication with a channel (34) of the circuit of high-pressure fluid, the said slide (27) tending to take up its second position as soon as the grooved roller (3) approaches the pressure roller (2) and the length (L) of the centre-distance (10, 11) diminishes, and to take-up its first position as soon as the grooved roller (3) moves away from the pressure roller (2) and the length (L) of the centre-distance (10, 11) increases.
8. A device as in Claims 3 or 6, characterized in that the end portion (28) of the slide (27) opposite from the end (30) of it which is held in contact with the adjusting screw (3) forms a piston of a jack (29) which is fed by the same high-pressure circuit as the chamber (22) of the jack (19).
9. A device as in any one of the Claims 1 to 8, characterized in that the grooved roller (3) or one of the components which is connected to rotate with it, such as the motor unit (9), is equipped with means of counting revolutions.
EP84901199A 1983-03-16 1984-03-15 Device for driving a rigid wire pressed between two groove rollers Expired EP0138895B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304305 1983-03-16
FR838304305A FR2542719B1 (en) 1983-03-16 1983-03-16 DEVICE FOR DRIVING A RIGID WIRE CLOSED BETWEEN TWO THREADED ROLLERS

Publications (2)

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EP0138895A1 EP0138895A1 (en) 1985-05-02
EP0138895B1 true EP0138895B1 (en) 1986-12-30

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EP84901199A Expired EP0138895B1 (en) 1983-03-16 1984-03-15 Device for driving a rigid wire pressed between two groove rollers

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US (1) US4629105A (en)
EP (1) EP0138895B1 (en)
JP (1) JPS60500526A (en)
AU (1) AU567739B2 (en)
BR (1) BR8406448A (en)
DE (1) DE3461774D1 (en)
FR (1) FR2542719B1 (en)
IT (1) IT1173827B (en)
SU (1) SU1268102A3 (en)
WO (1) WO1984003688A1 (en)

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US8701555B2 (en) 2012-04-25 2014-04-22 Illinois Tool Works Inc. Tension head for modular steel strapping machine
US9651053B2 (en) * 2014-01-24 2017-05-16 Pratt & Whitney Canada Corp. Bleed valve

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DE664993C (en) * 1934-05-09 1938-09-10 Eduard Meyer Automatic hydraulic adjustment device for rolling mills
US3093285A (en) * 1959-04-28 1963-06-11 M & T Chemicals Inc Electrode feeding mechanism for welding apparatus
US3396888A (en) * 1966-09-15 1968-08-13 Henry V. Rygiol Wire feeder
DE1777022C3 (en) * 1968-08-23 1975-06-12 Usm Corp. (N.D.Ges.D.Staates New Jersy), Boston, Mass. (V.St.A.) Hydraulic adjustment device for roll stands
US3675837A (en) * 1970-09-03 1972-07-11 Weld Motion Inc Wire feeder
US3657940A (en) * 1970-11-19 1972-04-25 William S Wagner Adjustable roll drive
AU478287B2 (en) * 1972-07-26 1974-11-28 Evola Industries Limited wire TENSIONING DEVICE
DE2338583C3 (en) * 1973-07-30 1978-12-21 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Device for transporting a strapping band
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DE3021673C2 (en) * 1980-06-10 1983-07-21 Philipp Holzmann Ag, 6000 Frankfurt Insertion device for tendons

Also Published As

Publication number Publication date
JPH0364421B2 (en) 1991-10-07
US4629105A (en) 1986-12-16
IT1173827B (en) 1987-06-24
EP0138895A1 (en) 1985-05-02
JPS60500526A (en) 1985-04-18
IT8420032A0 (en) 1984-03-13
FR2542719A1 (en) 1984-09-21
AU567739B2 (en) 1987-12-03
AU2815384A (en) 1984-10-09
FR2542719B1 (en) 1985-07-26
WO1984003688A1 (en) 1984-09-27
SU1268102A3 (en) 1986-10-30
DE3461774D1 (en) 1987-02-05
BR8406448A (en) 1985-03-12

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