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EP0136245A2 - Apparatus for stringing rackets - Google Patents

Apparatus for stringing rackets Download PDF

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Publication number
EP0136245A2
EP0136245A2 EP84440039A EP84440039A EP0136245A2 EP 0136245 A2 EP0136245 A2 EP 0136245A2 EP 84440039 A EP84440039 A EP 84440039A EP 84440039 A EP84440039 A EP 84440039A EP 0136245 A2 EP0136245 A2 EP 0136245A2
Authority
EP
European Patent Office
Prior art keywords
rope
support bar
support
tension
electric motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84440039A
Other languages
German (de)
French (fr)
Other versions
EP0136245A3 (en
Inventor
Jacques Morel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Morel Technic Sarl
Original Assignee
Morel Technic Sarl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Morel Technic Sarl filed Critical Morel Technic Sarl
Publication of EP0136245A2 publication Critical patent/EP0136245A2/en
Publication of EP0136245A3 publication Critical patent/EP0136245A3/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/14—Arrangements for stringing, e.g. for controlling the tension of the strings during stringing

Definitions

  • the present invention relates to an apparatus for stringing rackets, in particular tennis rackets, comprising a frame on which are mounted a support arranged to hold the frame of the racket and a traction jaw secured to a carriage, driven by mechanical means, this jaw comprising means for gripping the rope used to string the racket, and said mechanical means comprising an electric motor as well as members for coupling this motor with said carriage.
  • Apparatuses for stringing tennis rackets are already known, which are either entirely manual or entirely automated.
  • Entirely manual devices generally consist of a support carrying a cradle which makes it possible to fix the frame of the racket and a device with counterweight which makes it possible to apply a predetermined tension on the rope.
  • Fully automated devices are generally provided with a screen on which the desired tension of the racket string can be displayed and are programmed to carry out a cycle of various operations which make it possible to string the racket with an effective tension of the strings corresponding to the value of the voltage displayed on the screen.
  • the present invention proposes to remedy these various drawbacks by producing a device as mentioned above, semi-automatic, easy to handle and maintain, and making it possible to string the rackets in such a way that the rope is not injured in any way. moment of its assembly.
  • the apparatus for stringing rackets is characterized in that it comprises a device for manually displaying the desired tension of the string at a predetermined value and an availability. to control the stopping of the electric motor when the effective tension of the rope is equal to said predetermined voltage displayed.
  • the device for displaying a predetermined value of the tension of the rope comprises a manual indicator member connected to a counterweight element movable axially with respect to a pivoting support bar, and means for coupling said element counterweight and said indicating member to correspond to each position of the counterweight element on said support bar, a predetermined value of the tension of the rope, displayed by the indicating member.
  • the support bar is preferably constituted by a pivoting rod about a fixed axis.
  • the counterweight element is advantageously constituted by a slide made up of two articulated jaws, one relative to the other about a fixed axis and biased in the direction of their relative opening by a thrust spring, one jaws bearing on a fixed guide member secured to the chassis and the other jaw exerting, on said support bar, a thrust intended to cause it to tilt up or down depending on its axial position relative to the pivot axis.
  • the thrust spring is preferably equipped with a device for adjusting the compression force exerted between the jaws.
  • the support bar is also associated with a calibration spring exerting on this bar a same direction of force or opposite to that exer - gered by the counterweight member ..
  • this bar is associated with a switch interposed on the supply circuit of said electric motor.
  • the mechanical drive means of the carriage advantageously comprise a rack integral with said carriage, which meshes with a toothed wheel coupled to said electric motor and mounted on a rocker body carrying a support on which is mounted said support bar and said motor. electric.
  • the support for holding the frame of the racket preferably comprises a tilting cradle arranged to allow this frame to adopt a position aligned with the rope retained by the traction jaw.
  • This arrangement constitutes a considerable advantage of this device because the section of rope stretched between two opposite holes in the frame of the racket is in line with the rope retained by the traction jaw and only undergoes reduced friction against the edges. of these openings when the rope is stretched by the traction members. Con - trairement the devices of the prior art, this device allows to avoid friction of the rope, which in some cases result in local injury can weaken the rope at certain points.
  • the tilting cradle advantageously consists of two arches mounted on a rigid plate and carried by a support block, itself mounted on a lever pivoting around a fixed axis.
  • the lever is preferably associated with a spring member arranged to exert on it a force opposite to that exerted by the weight of the cradle. Furthermore, this lever advantageously comprises stop and locking members intended to block it in a predetermined position and in particular in its inclined position.
  • the machine according to FIG. 1 essentially consists of two parts: a first part which constitutes the device 10 for holding the frame of the racket to be strung (arranged on the left of FIG. 1) and a second part which constitutes the traction mechanism 30 of the rope (arranged on the right of FIG. 1) and represented in more detail by FIGS. 2 and 3.
  • the holding device 10 of the racket frame (not shown) essentially consists of a cradle consisting of two columns 11 each carrying a hoop 12 equipped in a manner known per se with fastening members of the frame of the racket.
  • the columns 11 are mounted on a plate 13 secured to a rotary axis 14, carried by a support block 15, fixed to one end of a lever 16 pivoting around a fixed axis 17.
  • a tab 18 is fixed to the lever 16 near its pivot axis 17 and perpendicular to this axis, to serve as a point of attachment to one end of a spring 19, the other end of which is retained by a adjusting screw 20 of the tension of this spring, carried by a part 21 fixed to a beam 22 of the chassis of the machine.
  • the holding device 10 is shown in solid lines in its rest position, substantially horizontal, and in broken lines in its working position, inclined relative to the horizontal.
  • the inclination of the cradle ensures alignment of the racket frame with the rope stretched by the traction mechanism and thus prevents friction of this rope on the edges of the holes in the friction frame, which could damage or even surface or deeply injure the rope and cause local weakening of the rope, which can cause premature rope breakage.
  • the inclination of the cradle is limited by a spout 23 of a worm mechanism rusting 24 comprising a control lever 25, a part 26 provided with said spout 23 and with a spring 27 which pushes the part 26 into abutment against the part 21.
  • a rotating barrel 28 is mounted on a plate 29 in the center of the plate 13, to allow the attachment of a clamp (not shown) for retaining the stretched rope.
  • the spring 19 ' is a balancing spring which at least partially compensates for the forces due to the weight of the cradle and of the frame mounted on this cradle. Therefore, the cradle will always adopt its inclined position even if the tensions exerted on the rope are relatively low.
  • the traction mechanism 30 essentially consists of a supply and control box 70 fixed to the side member 22 or on any other support integral with the chassis of the machine, a traction jaw 31 of the rope 32, mounted on a support linked to a mobile carriage 33.
  • the traction jaw 31 is shown in solid lines in its rest position and in broken lines in its working position.
  • the traction mechanism 30 comprises a fixed cradle 34 secured in particular to the side member 22 of the chassis of the machine, and provided with two guide rails 35 allowing movement in translation of this carriage.
  • This carriage carries a rack 36, arranged parallel to the guide rails 35, which meshes with a toothed wheel 37 coupled to the electric motor 38 by means of a series of toothed wheels 39, 40 and 41.
  • the wheels 40 and 41 are made integral with one another by a pin 42. This assembly makes it possible to drive the carriage 33 by the electric motor 38.
  • the apparatus is provided with a device for automatically controlling the stopping of the electric motor 38, that is to say the stopping of the carriage 33.
  • This device comprises a counterweight element 43 composed of an upper jaw 44, a lower jaw 45, and a thrust spring 46 which pushes one of the jaws relative to the other in the direction of their opening around a joint constituted by an axis 47.
  • the upper jaw 44 is provided with two rollers 48 which bear against the lower surface of a fixed guide rod 49
  • the lower jaw 45 comprises a roller 50 which rolls on the upper surface of a bar d 'support 51 carried by a support 52 movable about its pivot axis 53, which is also the axis of the toothed wheel 37.
  • This axis 53 is carried by a support 71 rigidly connected to the chassis of the device by screws 72 It carries a part 73 which constitutes the body of the rocker to which the electric motor 38 is fixed, as well as the movable support 52 carrying the support bar 51.
  • a calibration spring 54 of adjustable tension thanks to an adjustment device 55 exerts, on the anterior end of this bar, a force of reminder which tends to bring this bar back to its second upward inclined position:
  • a position sensor 56 which can be constituted by a switch or a micro-contact or a sensor of the magnetic, inductive, optical, etc. type, detects the high position of the support bar and interrupts the power supply to the motor 38.
  • the pushing force of the spring 46 acting on the jaws 44 and 45 makes it possible to determine the range of useful values of the tension of the rope.
  • An adjustment screw 57 makes it possible to modify this tension as desired.
  • the device for displaying the desired tension of the rope comprises a display disc 58 mounted on a drum 59 associated with a mobile indicator, such as for example a needle, intended to indicate a value of the desired tension of the rope displayed on the disc 58.
  • This drum is carried by an inclined plate 60, mounted on the fixed cradle 34.
  • the drum 59 is connected to the counterweight element 43 by a cable 61 passing through a peripheral groove of a deflection roller 62 and attached to said counterweight element 43. In this way, each position of the counterweight element 43, relative to the pivoting support bar 51, corresponds to a value of the desired tension of the rope.
  • Limit switches 65 and 63 are mounted on the device to respectively define the limit switches of the counterweight element 43 and the movable carriage 33.
  • a protective cover 64 covers the components of the device and is connected by known means to its chassis.
  • the calibration spring exerts on. the support bar 51, a force which tends to make it tip over in its high position in the absence of another force, and in particular of a tensile force exerted on the jaw 31.
  • the sensor 56 advantageously constituted by a switch, is engaged, so that the electric motor 38 drives the mobile carriage to the point where the pulling force exerted on the rope is sufficient to rotate the body of the scale 73 around the axis 53, which has the effect of rotating the support bar 51 and interrupting the supply of the electric motor.
  • the counterweight 43 is placed to the right (in fig.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Ropes Or Cables (AREA)

Abstract

Apparatus for stringing rackets and especially tennis rackets. It is composed essentially of a device (10) for holding the frame of the racket and a mechanism (30) for tensioning the string (32). The holding mechanism comprises a tiltable cradle consisting of two columns (11) carrying arches (12) and which are mounted on a plate (13) integral with a rotating shaft (14), the assembly being fixed to a pivoting lever (16). The tensioning mechanism comprises a jaw (31) for fixing the string (32) and which is integral with a movable carriage (33). The apparatus is particularly advantageous since it permits efficient semi-automatic stringing. <IMAGE>

Description

La..présente invention concerne un appareil à corder les raquettes, notamment les raquettes de tennis, comportant un châssis sur lequel sont montés un support agencé pour maintenir le cadre de la raquette et un mors de traction solidaire d'un chariot, entraîné par des moyens mécaniques, ce mors comportant des moyens pour pincer la corde utilisée pour corder la raquette, et lesdits moyens mécaniques comportant un moteur électrique ainsi que des organes pour coupler ce moteur avec ledit chariot.The present invention relates to an apparatus for stringing rackets, in particular tennis rackets, comprising a frame on which are mounted a support arranged to hold the frame of the racket and a traction jaw secured to a carriage, driven by mechanical means, this jaw comprising means for gripping the rope used to string the racket, and said mechanical means comprising an electric motor as well as members for coupling this motor with said carriage.

On connaît déjà des appareils à corder les raquettes de tennis, qui sont soit entièrement manuels, soit entièrement automatisés . Les appareils entièrement manuels se composent généralement d'un support portant un berceau qui permet de fixer le cadre de la raquette et un dispositif à contrepoids qui permet d'appliquer une tension prédéterminée sur la corde. Les appareils entièrement automatisés sont généralement pourvus d'un écran sur lequel on peut afficher la tension souhaitée de la corde de la raquette et sont programmés pour effectuer un cycle de manoeuvres diverses qui permettent de corder la raquette avec une tension effective des cordes correspondant à la valeur de la tension affichée sur l'écran.Apparatuses for stringing tennis rackets are already known, which are either entirely manual or entirely automated. Entirely manual devices generally consist of a support carrying a cradle which makes it possible to fix the frame of the racket and a device with counterweight which makes it possible to apply a predetermined tension on the rope. Fully automated devices are generally provided with a screen on which the desired tension of the racket string can be displayed and are programmed to carry out a cycle of various operations which make it possible to string the racket with an effective tension of the strings corresponding to the value of the voltage displayed on the screen.

Alors que les appareils entièrement manuels présentent des défauts de conception qui ne permettent pas un cordage précis des raquettes, les appareils entièrement automatisés qui permettent de pallier ces inconvénients sont relativement coûteux et nécessitent l'intervention de techniciens qualifiés en cas de panne.While fully manual devices have design flaws that do not allow precise racket stringing, fully automated devices that overcome these drawbacks are relatively expensive and require the intervention of qualified technicians in the event of a breakdown.

La présente invention se propose de remédier à ces différents inconvénients en réalisant un appareil tel que mentionné ci-dessus, semi-automatique, facile à manipuler et à entretenir, et permettant de corder les raquettes de telle manière que la corde ne subit aucune blessure au moment de son montage.The present invention proposes to remedy these various drawbacks by producing a device as mentioned above, semi-automatic, easy to handle and maintain, and making it possible to string the rackets in such a way that the rope is not injured in any way. moment of its assembly.

Dans ce but, l'appareil à corder les raquettes selon l'invention est caractérisé en ce qu'il comprend un dispositif pour afficher manuellement la tension souhaitée de la corde à une valeur prédéterminée et un dispositif pour commander l'arrêt du moteur électrique lorsque la tension effective de la corde est égale à ladite tension prédéterminée affichée.For this purpose, the apparatus for stringing rackets according to the invention is characterized in that it comprises a device for manually displaying the desired tension of the string at a predetermined value and an availability. to control the stopping of the electric motor when the effective tension of the rope is equal to said predetermined voltage displayed.

Selon une forme de réalisation préférée, le dispositif pour afficher une valeur prédéterminée de la tension de la corde comporte un organe indicateur manuel relié à un élément de contrepoids mobile axialement par rapport à une barre d'appui pivotante, et un moyen de couplage dudit élément de contrepoids et dudit organe indicateur pour faire correspondre à chaque position de l'élément de contrepoids sur ladite barre d'appui, une valeur prédéterminée de la tension de la corde, visualisée par l'organe indicateur. De cette manière, la tension appliquée sur chacune des cordes est exactement la même et l'application de cette tension se fait d'une manière automatique sans effort pour l'opérateur. La barre d'appui est de préférence constituée par une tige pivotante autour d'un axe fixe. L'élément de contrepoids est avantageusement constitue par un coulisseau composé de deux mâchoires articulées, l'une par rapport à l'autre autour d'un axe fixe et sollicitées dans le sens de leur ouverture relative par un ressort de poussée, l'une des mâchoires prenant appui sur un organe de guidage fixe solidaire du châssis et l'autre mâchoire exerçant, sur ladite barre d'appui, une poussée destinée à la faire basculer vers le haut ou vers le bas en fonction de sa position axiale par rapport à l'axe de pivotement.According to a preferred embodiment, the device for displaying a predetermined value of the tension of the rope comprises a manual indicator member connected to a counterweight element movable axially with respect to a pivoting support bar, and means for coupling said element counterweight and said indicating member to correspond to each position of the counterweight element on said support bar, a predetermined value of the tension of the rope, displayed by the indicating member. In this way, the tension applied to each of the cords is exactly the same and the application of this tension is done in an automatic manner without effort for the operator. The support bar is preferably constituted by a pivoting rod about a fixed axis. The counterweight element is advantageously constituted by a slide made up of two articulated jaws, one relative to the other about a fixed axis and biased in the direction of their relative opening by a thrust spring, one jaws bearing on a fixed guide member secured to the chassis and the other jaw exerting, on said support bar, a thrust intended to cause it to tilt up or down depending on its axial position relative to the pivot axis.

Le ressort de poussée est de préférence équipé d'un dispositif de réglage de la force de compression exercée entre les mâchoires.The thrust spring is preferably equipped with a device for adjusting the compression force exerted between the jaws.

La barre d'appui est par ailleurs associée à un ressort d'étalonnage exerçant sur cette barre une force de même sens ou opposée à celle exer- cée par l'élément de contrepoids..The support bar is also associated with a calibration spring exerting on this bar a same direction of force or opposite to that exer - gered by the counterweight member ..

Pour permettre de couper le circuit d'alimentation du moteur électrique lorsque la barre d'appui bascule dans sa position basse, cette barre est associée à un interrupteur interposé sur le circuit d'alimentation dudit moteur électrique.To make it possible to cut off the electric motor supply circuit when the support bar switches to its low position, this bar is associated with a switch interposed on the supply circuit of said electric motor.

Les moyens d'entrainement mécaniques du chariot comportent avantageusement une crémaillère solidaire dudit chariot, qui s'engrène avec une roue dentée couplée audit moteur électrique et montée sur un corps de bascule portant un support sur lequel est montée ladite barre d'appui et ledit moteur électrique.The mechanical drive means of the carriage advantageously comprise a rack integral with said carriage, which meshes with a toothed wheel coupled to said electric motor and mounted on a rocker body carrying a support on which is mounted said support bar and said motor. electric.

Le support pour maintenir le cadre de la raquette comporte de préférence un berceau inclinable agencé pour permettre à ce cadre d'adopter une position alignée avec la corde retenue par le mors de traction. Cet agencement constitue un avantage considérable de ce dispositif du fait que le tronçon de corde tendu entre deux trous opposés du cadre de la raquette se trouve dans le prolongement de la corde retenue par le mors de traction et ne subit que des frottements réduits contre les bords de ces ouvertures lorsque la corde est tendue par les organes de traction. Con- trairement aux appareils de l'art antérieur, cet appareil permet donc d'éviter les frottements de la corde, qui, dans certains cas entraînent des blessures locales susceptibles d'affaiblir la corde en certains points.The support for holding the frame of the racket preferably comprises a tilting cradle arranged to allow this frame to adopt a position aligned with the rope retained by the traction jaw. This arrangement constitutes a considerable advantage of this device because the section of rope stretched between two opposite holes in the frame of the racket is in line with the rope retained by the traction jaw and only undergoes reduced friction against the edges. of these openings when the rope is stretched by the traction members. Con - trairement the devices of the prior art, this device allows to avoid friction of the rope, which in some cases result in local injury can weaken the rope at certain points.

Le berceau inclinable se compose avantageusement de deux arceaux montés sur un plateau rigide et portés par un bloc support, lui-même monté sur un levier pivotant autour d'un axe fixe.The tilting cradle advantageously consists of two arches mounted on a rigid plate and carried by a support block, itself mounted on a lever pivoting around a fixed axis.

Pour favoriser la mise en place du berceau dans sa position inclinée pour les tensions relativement basses appliquées sur la corde, le levier est de préférence associé à un organe ressort agencé pour exercer sur lui une force opposée à celle exercée par le poids du berceau. Par ailleurs, ce levier comporte avantageusement des organes d'arrêt et de verrouillage destinés à le bloquer dans une position prédéterminée et notamment dans sa position inclinée.To favor the positioning of the cradle in its inclined position for the relatively low tensions applied to the rope, the lever is preferably associated with a spring member arranged to exert on it a force opposite to that exerted by the weight of the cradle. Furthermore, this lever advantageously comprises stop and locking members intended to block it in a predetermined position and in particular in its inclined position.

La présente invention sera mieux comprise en référence à la description d'un exemple de réalisation préféré et du dessin annexé, dans lequel :

  • La figure 1 représente une vue schématique de l'ensemble de l'appareil,
  • La figure 2 représente une vue plus détaillée de la partie constituant le mécanisme de traction, et
  • La figure 3 représente une vue partiellement coupée de la partie de la machine représentée par la figure 2.
The present invention will be better understood with reference to the description of a preferred embodiment and the attached drawing, in which:
  • FIG. 1 represents a schematic view of the entire apparatus,
  • Figure 2 shows a more detailed view of the component part the traction mechanism, and
  • FIG. 3 represents a partially cut away view of the part of the machine represented by FIG. 2.

La machine selon la figure 1 se compose essentiellement de deux parties : une première partie qui constitue le dispositif de maintien 10 du cadre de la raquette à corder (disposé à gauche de la figure 1) et une deuxième partie qui constitue le mécanisme de traction 30 de la corde (disposé à droite de la figure 1) et représenté plus en détail par les figures 2 et 3.The machine according to FIG. 1 essentially consists of two parts: a first part which constitutes the device 10 for holding the frame of the racket to be strung (arranged on the left of FIG. 1) and a second part which constitutes the traction mechanism 30 of the rope (arranged on the right of FIG. 1) and represented in more detail by FIGS. 2 and 3.

Le dispositif de maintien 10 du cadre de la raquette (non représentée) se compose essentiellement d'un berceau consitué de deux colonnes 11 portant chacune un arceau 12 équipé d'une manière connue en soi d'organes de fixation du cadre de la raquette. Les colonnes 11 sont montées sur un plateau 13 solidaire d'un axe rotatif 14, porté par un bloc support 15, fixé à une extrémité d'un levier 16 pivotant autour d'un axe fixe 17.The holding device 10 of the racket frame (not shown) essentially consists of a cradle consisting of two columns 11 each carrying a hoop 12 equipped in a manner known per se with fastening members of the frame of the racket. The columns 11 are mounted on a plate 13 secured to a rotary axis 14, carried by a support block 15, fixed to one end of a lever 16 pivoting around a fixed axis 17.

Une patté 18 est fixée au levier 16 à proximité de son axe de pivotement 17 et perpendiculairement à cet axe, pour servir de point d'attache à une extrémité d'un ressort 19 dont l'autre extrémité est retenue par une vis 20 de réglage de la tension de ce ressort, portée par une pièce 21 fixée à un longeron 22 du châssis de la machine.A tab 18 is fixed to the lever 16 near its pivot axis 17 and perpendicular to this axis, to serve as a point of attachment to one end of a spring 19, the other end of which is retained by a adjusting screw 20 of the tension of this spring, carried by a part 21 fixed to a beam 22 of the chassis of the machine.

Sur la figure 1, le dispositif de maintien 10 est représenté en traits pleins dans sa position de repos, sensiblement horizontale, et en traits interrompus dans sa position de travail, inclinée par rapport à l'horizontale. L'inclinaison du berceau permet d'assurer un alignement du cadre de la raquette avec la corde tendue par le mécanisme de traction et d'éviter ainsi une friction de cette corde sur les bords des trous du cadre friction susceptible d'endommager, voire de blesser superficiellement ou en profondeur la corde et d'entraîner un affaiblissement local de cette dernière, qui peut être à l'origine d'une rupture prématurée de la corde. L'inclinaison du berceau est limitée par un bec 23 d'un mécanisme de verrouillage 24 comportant un levier de commande 25, une pièce 26 pourvue dudit bec 23 et d'un ressort 27 qui repoussse la pièce 26 en butée contre la pièce 21.In Figure 1, the holding device 10 is shown in solid lines in its rest position, substantially horizontal, and in broken lines in its working position, inclined relative to the horizontal. The inclination of the cradle ensures alignment of the racket frame with the rope stretched by the traction mechanism and thus prevents friction of this rope on the edges of the holes in the friction frame, which could damage or even surface or deeply injure the rope and cause local weakening of the rope, which can cause premature rope breakage. The inclination of the cradle is limited by a spout 23 of a worm mechanism rusting 24 comprising a control lever 25, a part 26 provided with said spout 23 and with a spring 27 which pushes the part 26 into abutment against the part 21.

Un canon 28 rotatif est monté sur une plaque 29 au centre du plateau 13, pour permettre la fixation d'une pince (non représentée) de retenue de la corde tendue.A rotating barrel 28 is mounted on a plate 29 in the center of the plate 13, to allow the attachment of a clamp (not shown) for retaining the stretched rope.

Le ressort 19 'est un ressort d'équilibrage qui permet de compenser au moins partiellement les forces dues au poids du berceau et du cadre monté sur ce berceau. De ce fait, le berceau adoptera toujours sa position inclinée même si les tensions exercées sur la corde sont relativement faibles.The spring 19 ' is a balancing spring which at least partially compensates for the forces due to the weight of the cradle and of the frame mounted on this cradle. Therefore, the cradle will always adopt its inclined position even if the tensions exerted on the rope are relatively low.

Le mécanisme de traction 30 se compose essentiellement d'un coffret d'alimentation et de commande 70 fixé au longeron 22 ou sur tout autre support solidaire du châssis de la machine, d'un mors de traction 31 de la corde 32, monté sur un support lié à un chariot mobile 33. Sur la figure 1, le mors de traction 31 est représenté en traits pleins dans sa position de repos et en traits interrompus dans sa position de travail.The traction mechanism 30 essentially consists of a supply and control box 70 fixed to the side member 22 or on any other support integral with the chassis of the machine, a traction jaw 31 of the rope 32, mounted on a support linked to a mobile carriage 33. In FIG. 1, the traction jaw 31 is shown in solid lines in its rest position and in broken lines in its working position.

Comme le montrent plus particulièrement les fig. 2 et 3, le mécanisme de traction 30 comporte un bercau fixe 34 solidaire notamment du longeron 22 du châssis de la machine, et pourvu de deux rails de guidage 35 permettant un déplacement en translation de ce chariot.As shown more particularly in FIGS. 2 and 3, the traction mechanism 30 comprises a fixed cradle 34 secured in particular to the side member 22 of the chassis of the machine, and provided with two guide rails 35 allowing movement in translation of this carriage.

Ce chariot porte une crémaillère 36, disposée parallèlement aux rails de guidage 35, qui s'engrène avec une roue dentée 37 couplée au moteur électrique 38 par l'intermédiairé d'une série de roues dentées 39, 40 et 41. Les roues 40 et 41 sont rendues solidaires l'une de l'autre par une goupille 42. Cet assemblage permet d'assurer l'entrainement du chariot 33 par le moteur électrique 38.This carriage carries a rack 36, arranged parallel to the guide rails 35, which meshes with a toothed wheel 37 coupled to the electric motor 38 by means of a series of toothed wheels 39, 40 and 41. The wheels 40 and 41 are made integral with one another by a pin 42. This assembly makes it possible to drive the carriage 33 by the electric motor 38.

Comme mentionné précédemment, l'appareil est pourvu d'un dispositif pour commander automatiquement l'arrêt du moteur électrique 38, c'est-à-dire l'arrêt du chariot 33. Ce dispositif comprend un élément de contrepoids 43 composé d'une mâchoire supérieure 44, d'une mâchoire inférieure 45, et d'un ressort de poussée 46 qui repousse l'une des mâchoires par rapport à l'autre dans le sens de leur ouverture autour d'une articulation constituée par un axe 47. La mâchoire supérieure 44 est pourvue de deux galets 48 qui prennent appui contre la surface inférieure d'une tige de guidage fixe 49, et la mâchoire inférieure 45 comporte un galet 50 qui roule sur la surface supérieure d'une barre d'appui 51 portée par un support 52 mobile autour de son axe de pivotement 53, qui est également l'axe de la roue dentée 37. Cet axe 53 est porté par un support 71 relié rigidement au châssis de l'appareil par des vis 72. Il porte une pièce 73 qui constitue le corps de la bascule auquel est fixé le moteur électrique 38, ainsi que le support mobile 52 portant la barre d'appui 51. Un ressort d'étalonnage 54 de tension réglable grâce à un dispositif de réglage 55 exerce, sur l'extrémité antérieure de cette barre, une force de rappel qui tend à ramener cette barre vers sa seconde position inclinée vers le haut: Un capteur de position 56, qui peut être constitué par un interrupteur ou un micro-contact ou un capteur du type magnétique, inductif, optique, etc ..., permet de détecter la position haute de la barre d'appui et d'interrompre l'alimentation du moteur 38.As mentioned above, the apparatus is provided with a device for automatically controlling the stopping of the electric motor 38, that is to say the stopping of the carriage 33. This device comprises a counterweight element 43 composed of an upper jaw 44, a lower jaw 45, and a thrust spring 46 which pushes one of the jaws relative to the other in the direction of their opening around a joint constituted by an axis 47. The upper jaw 44 is provided with two rollers 48 which bear against the lower surface of a fixed guide rod 49, and the lower jaw 45 comprises a roller 50 which rolls on the upper surface of a bar d 'support 51 carried by a support 52 movable about its pivot axis 53, which is also the axis of the toothed wheel 37. This axis 53 is carried by a support 71 rigidly connected to the chassis of the device by screws 72 It carries a part 73 which constitutes the body of the rocker to which the electric motor 38 is fixed, as well as the movable support 52 carrying the support bar 51. A calibration spring 54 of adjustable tension thanks to an adjustment device 55 exerts, on the anterior end of this bar, a force of reminder which tends to bring this bar back to its second upward inclined position: A position sensor 56, which can be constituted by a switch or a micro-contact or a sensor of the magnetic, inductive, optical, etc. type, detects the high position of the support bar and interrupts the power supply to the motor 38.

La force de poussée du ressort 46 agissant sur les mâchoires 44 et 45 permet de déterminer la plage des valeurs utiles de la tension de la corde. Une vis de réglage 57 permet de modifier à volonté cette tension.The pushing force of the spring 46 acting on the jaws 44 and 45 makes it possible to determine the range of useful values of the tension of the rope. An adjustment screw 57 makes it possible to modify this tension as desired.

Le dispositif pour afficher la tension souhaitée de la corde comporte un disque d'affichage 58 monté sur un tambour 59 associé à un indicateur mobile, tel que par exemple une aiguille, destinée à indiquer une valeur de la tension souhaitée de la corde affichée sur le disque 58. Ce tambour est porté par une plaque 60 inclinée, monté sur le berceau fixe 34. Le tambour 59 est relié à l'élément de contrepoids 43 par un câble 61 passant dans une gorge périphérique d'un galet de renvoi 62 et rattaché audit élément de contrepoids 43. De cette manière, à chaque position de l'élément de contrepoids 43, par rapport à la barre d'appui pivotante 51, correspond une valeur de la tension souhaitée de la corde.The device for displaying the desired tension of the rope comprises a display disc 58 mounted on a drum 59 associated with a mobile indicator, such as for example a needle, intended to indicate a value of the desired tension of the rope displayed on the disc 58. This drum is carried by an inclined plate 60, mounted on the fixed cradle 34. The drum 59 is connected to the counterweight element 43 by a cable 61 passing through a peripheral groove of a deflection roller 62 and attached to said counterweight element 43. In this way, each position of the counterweight element 43, relative to the pivoting support bar 51, corresponds to a value of the desired tension of the rope.

Des contacts de fin de course 65 et 63 sont montés sur l'appareil pour définir respectivement les fins de course de l'élément de contrepoids 43 et du chariot mobile 33. Un capot de protection 64 recouvre les composants de l'appareil et est relié par des moyens connus à son châssis.Limit switches 65 and 63 are mounted on the device to respectively define the limit switches of the counterweight element 43 and the movable carriage 33. A protective cover 64 covers the components of the device and is connected by known means to its chassis.

Pour corder une raquette, l'opérateur fixe le cadre de cette raquette sur son berceau inclinable et affiche la tension souhaitée de la corde sur le dispositif d'affichage décrit précédemment.To string a racket, the operator fixes the frame of this racket on its tilting cradle and displays the desired tension of the rope on the display device described above.

Lorsque l'élément de contrepoids 43 est placé au point d'équilibre de la barre d'appui 51, c'est-à-dire à proximité immédiate de l'axe de pivotement 53, le ressort d'étalonnage exerce, sur. la barre d'appui 51, une force qui tend à la faire.basculer dans sa position haute en l'absence d'une autre force, et notamment d'une force de traction exercée sur le mors 31. Lorsque l'opérateur enclenche l'appareil, le capteur 56, constitué avantageusement par un interrupteur, est enclenché, de sorte que le moteur électrique 38 entraîne le chariot mobile jusqu'au point où la force de traction exercée sur la corde est suffisante pour faire pivoter le corps de la bascule 73 autour de l'axe 53, ce qui a pour effet de faire pivoter la barre d'appui 51 et d'interrompre l'alimentation du moteur électrique. Lorsque l'on place le contrepoids 43 à droite (sur la fig. 2) de son point d'équilibre, la force qu'il exerce sur la barre d'appui est opposée à celle exercée par le ressort d'étalonnage. De cette manière, la bascule 73 pivote vers sa position basse dès que la somme des forces, résultant de la poussée du ressort 46 et de la traction exercée par la corde, équilibre la force exercée par le ressort d'étalonnage 54.When the counterweight element 43 is placed at the point of equilibrium of the support bar 51, that is to say in the immediate vicinity of the pivot axis 53, the calibration spring exerts on. the support bar 51, a force which tends to make it tip over in its high position in the absence of another force, and in particular of a tensile force exerted on the jaw 31. When the operator engages the device, the sensor 56, advantageously constituted by a switch, is engaged, so that the electric motor 38 drives the mobile carriage to the point where the pulling force exerted on the rope is sufficient to rotate the body of the scale 73 around the axis 53, which has the effect of rotating the support bar 51 and interrupting the supply of the electric motor. When the counterweight 43 is placed to the right (in fig. 2) of its equilibrium point, the force which it exerts on the support bar is opposite to that exerted by the calibration spring. In this way, the rocker 73 pivots towards its low position as soon as the sum of the forces, resulting from the thrust of the spring 46 and the traction exerted by the rope, balances the force exerted by the calibration spring 54.

Par contre, lorsque l'opérateur place le contrepoids 43 à gauche (sur la fig. 2) de son point d'équilibre, la force qu'il exerce sur la barre d'appui est dirigée dans le même sens que celle exercée par le ressort d'étalonnage. De cette manière, la bascule 73 pivote vers sa position basse dès que la force résultant de la traction exercée sur la corde est égale à la somme des forces résultant de la poussée du ressort 46 et de la traction du ressort d'étalonnage 54.On the other hand, when the operator places the counterweight 43 to the left (in fig. 2) of its point of equilibrium, the force which it exerts on the support bar is directed in the same direction as that exerted by the calibration spring. In this way, the rocker 73 pivots towards its low position as soon as the force resulting from the traction exerted on the rope is equal to the sum of the forces resulting from the thrust of the spring 46 and the traction of the calibration spring 54.

Ces différentes possibilités de positionnement du contrepoids permettent d'obtenir une plage de tensions de la corde allant par exemple de 5 à 40 kg. Le réglage du ressort d'étalonnage permet de déplacer cette plage de valeurs. Le réglage du ressort du contrepoids permet d'étaler la plage des valeurs.These different possibilities of positioning the counterweight make it possible to obtain a range of rope tensions ranging for example from 5 to 40 kg. Adjusting the calibration spring moves this range of values. Adjusting the counterweight spring spreads the range of values.

Dans chaque cas, le basculement de la barre d'appui vers sa position basse provoque l'interruption de l'alimentation du moteur. A ce moment, la tension de la corde correspond à la tension affichée. Ltopérateur fixe la corde au moyen de la pince montée sur le canon 28 et recommence l'opération pour la boucle suivante de la corde.In each case, the tilting of the support bar towards its low position causes the interruption of the power supply to the motor. At this time, the rope tension corresponds to the displayed tension. L t operator fixed rope by means of the clamp mounted on the barrel 28 and the operation is repeated for the next loop of the rope.

Il est bien entendu que certains composants de cet appareil pourraient être modifiés ou remplacés par des éléments équivalents, bien connus de l'homme de l'art, sans que l'on sorte du cadre de la présente invention.It is understood that certain components of this device could be modified or replaced by equivalent elements, well known to those skilled in the art, without departing from the scope of the present invention.

Claims (11)

1. Appareil à corder les raquettes notamment les raquettes de tennis, comportant un chassis sur lequel sont montés un support agencé pour maintenir le cadre de la raquette et un mors de traction solidaire d'un chariot entraîné par des moyens mécaniques, ce mors comportant des moyens pour pincer la corde utilisée pour corder la raquette,et lesdits moyens mécaniques comportant un moteur électrique ainsi que des organes pour coupler ce moteur avec ledit chariot, caractérisé en ce qu'il comprend un dispositif (58) pour afficher manuellement la tension souhaitée de la corde à une valeur prédéterminée, et un dispositif (56) pour commander l'arrêt du moteur électrique lorsque la tension effective de la corde est égale à ladite tension prédéterminée affichée.1. Apparatus for stringing rackets, in particular tennis rackets, comprising a chassis on which are mounted a support arranged to hold the frame of the racket and a traction jaw secured to a carriage driven by mechanical means, this jaw comprising means for gripping the rope used to string the racket, and said mechanical means comprising an electric motor as well as members for coupling this motor with said carriage, characterized in that it comprises a device (58) for manually displaying the desired tension of the rope at a predetermined value, and a device (56) for controlling the stopping of the electric motor when the effective tension of the rope is equal to said displayed predetermined tension. 2. Appareil selon la revendication 1, caractérisé en ce que le dispositif pour afficher une valeur prédéterminée de la tension de la corde comporte un organe indicateur manuel relié à un élément de contrepoids (43) mobile axialement par rapport à une barre d'appui pivotante (51), et un moyen de couplage (61) dudit élément de contrepoids et dudit organe indicateur pour faire correspondre à chaque position de l' élément de contrepoids sur ladite barre d'appui, une valeur prédéterminée de la tension de la corde, visualisée par l'organe indicateur.2. Apparatus according to claim 1, characterized in that the device for displaying a predetermined value of the tension of the rope comprises a manual indicator member connected to a counterweight element (43) movable axially relative to a pivoting support bar (51), and a coupling means (61) of said counterweight element and of said indicating member to correspond to each position of the counterweight element on said support bar, a predetermined value of the tension of the rope, displayed by the indicating organ. 3. Appareil selon la revendication 2, caractérisé en ce que la barre d'appui (51) est constituée d'une tige pivotant autour d'un axe fixe (53).3. Apparatus according to claim 2, characterized in that the support bar (51) consists of a rod pivoting about a fixed axis (53). 4. Appareil selon la revendication 3, caractérisé en ce que l'élément de contrepoids (43) est constitué par un coulisseau composé de deux mâchoires (44) et (45) articulées l'une par rapport à l'autre autour d'un axe fixe (47) et sollicitées dans'le sens de leur ouverture relative par un ressort de poussée (46), l'une des mâchoires prenant appui sur un organe de guidage fixe (49) et l'autre mâchoire exerçant, sur ladite barre d'appui (51), une poussée destinée à la faire basculer vers le haut ou vers le bas en fonction de sa position axiale par rapport à l'axe de pivotement (53).4. Apparatus according to claim 3, characterized in that the counterweight element (43) is constituted by a slide composed of two jaws (44) and (45) articulated relative to one another around a fixed axis (47) and biased in the direction of their relative opening by a thrust spring (46), one of the jaws bearing on a fixed guide member (49) and the other jaw acting on said bar support (51), a thrust intended to tilt it up or down depending on its axial position relative to the pivot axis (53). 5. Appareil selon la revendication 4, caractérise en ce que le ressort de poussée (46) comporte un dispositif de réglage de la force de compression qu'il exerce sur les mâchoires (44) et (45).5. Apparatus according to claim 4, characterized in that the thrust spring (46) comprises a device for adjusting the compression force which it exerts on the jaws (44) and (45). 6. Appareil selon la revendication 2, caractérisé en ce que ladite barre d'appui (51) est associée à un ressort d'étalonnage (54), ce ressort exerçant sur cette barre une force de même sens ou opposée à celle exercée par l'élément de contrepoids (43).6. Apparatus according to claim 2, characterized in that said support bar (51) is associated with a calibration spring (54), this spring exerting on this bar a force of the same direction or opposite to that exerted by l counterweight element (43). 7. Appareil selon la revendication 6, caractérisé en ce que ladite barre d'appui (51) est associée à un organe détecteur de position (56), associé à un interrupteur agencé pour couper le circuit d'alimentation du moteur électrique (38) lorsque ladite barre d'appui se trouve dans sa position basse.7. Apparatus according to claim 6, characterized in that said support bar (51) is associated with a position detecting member (56), associated with a switch arranged to cut the power supply circuit of the electric motor (38) when said support bar is in its low position. 8. Appareil selon la revendication 1, caractérisé en ce que les moyens d'entralnement mécaniques du chariot comportent une crémaillère (36), solidaire dudit chariot (33), qui s'engrène avec une roue dentée (37) couplée audit moteur électrique (38) et montée sur un corps de bascule (73) portant.un support (52) sur lequel est montée ladite barre d'appui (51) et ledit moteur électrique.8. Apparatus according to claim 1, characterized in that the mechanical centering means of the carriage comprise a rack (36), integral with said carriage (33), which meshes with a toothed wheel (37) coupled to said electric motor ( 38) and mounted on a rocker body (73) carrying a support (52) on which is mounted said support bar (51) and said electric motor. 9. Appareil selon la revendication 1, caractérisé en ce que le support pour maintenir le cadre de la raquette comporte un berceau inclinable (10) agencé pour permettre à ce cadre d'adopter une position alignée avec la corde (32) retenue par le mors de traction (31).9. Apparatus according to claim 1, characterized in that the support for holding the frame of the racket comprises a tilting cradle (10) arranged to allow this frame to adopt a position aligned with the rope (32) retained by the jaw traction (31). 10. Appareil selon la revendication 8, caractérisé en ce que le berceau comporte deux arceaux (12), montés sur un plateau rigide (13) porté par un bloc support (15) fixé à un levier (16) pivotant autour d'un axe fixe 17.10. Apparatus according to claim 8, characterized in that the cradle comprises two arches (12), mounted on a rigid plate (13) carried by a support block (15) fixed to a lever (16) pivoting about an axis fixed 17. 11. Appareil selon la revendication 9, caractérisé en ce que le levier (16) comporte un organe ressort (19), agencé pour exercer sur ledit levier (16) une force opposée à celle exercée par le poids du berceau, et des organes d'arrêt (23,24), pour bloquer le levier (16) dans une position déterminée.11. Apparatus according to claim 9, characterized in that the lever (16) comprises a spring member (19), arranged to exert on said lever (16) a force opposite to that exerted by the weight of the cradle, and organs d 'stop (23,24), to lock the lever (16) in a determined position.
EP84440039A 1983-08-31 1984-08-30 Apparatus for stringing rackets Withdrawn EP0136245A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8314132A FR2551352B1 (en) 1983-08-31 1983-08-31 APPARATUS FOR CORDING RACKETS
FR8314132 1983-08-31

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EP0136245A2 true EP0136245A2 (en) 1985-04-03
EP0136245A3 EP0136245A3 (en) 1985-07-31

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EP (1) EP0136245A3 (en)
FR (1) FR2551352B1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706955A (en) * 1986-05-20 1987-11-17 Sumiaty Ngadi Racket frame clamp for stringing machine
FR2642655A1 (en) * 1989-02-07 1990-08-10 Babolat Vs APPARATUS FOR THE ROPE OF A TENNIS RACKET
EP0942775A4 (en) * 1996-10-08 2000-05-03 Wise U S A Inc Electronic racket stringing machine
EP1980300A1 (en) * 2007-04-11 2008-10-15 Wilson Sporting Goods Company Racquet stringing machine
US7468011B2 (en) * 2007-01-23 2008-12-23 Akira Tsuchida Work table apparatus for a stringing machine for tennis rackets
US7695383B2 (en) 2007-04-11 2010-04-13 Wilson Sporting Goods Co. Racquet stringing machine
US7833118B2 (en) 2007-04-11 2010-11-16 Wilson Sporting Goods Co. Racquet stringing machine
US8075429B2 (en) 2007-04-11 2011-12-13 Wilson Sporting Goods Co. Racquet stringing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104998387A (en) * 2015-07-29 2015-10-28 安徽理工大学 Scalable automatic tension solar tennis support

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918713A (en) * 1974-03-15 1975-11-11 Bernard Kaminstein Racket stringing machine
FR2475908A2 (en) * 1980-02-18 1981-08-21 Montana Sport IMPROVEMENTS TO THE ROCKET CORKING MACHINE
FR2484265A1 (en) * 1980-06-16 1981-12-18 Brignone Mariano Machine for stringing sports racquets - has strings held taught by lever system supporting counterweight to move upper arm

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706955A (en) * 1986-05-20 1987-11-17 Sumiaty Ngadi Racket frame clamp for stringing machine
FR2642655A1 (en) * 1989-02-07 1990-08-10 Babolat Vs APPARATUS FOR THE ROPE OF A TENNIS RACKET
EP0382652A1 (en) * 1989-02-07 1990-08-16 Babolat Vs Stringing apparatus for a tennis racket
US5026055A (en) * 1989-02-07 1991-06-25 Babolat Vs Equipment for stringing a tennis racket
US5080360A (en) * 1989-02-07 1992-01-14 Babolat Vs Equipment for stringing a tennis racket
EP0942775A4 (en) * 1996-10-08 2000-05-03 Wise U S A Inc Electronic racket stringing machine
US7468011B2 (en) * 2007-01-23 2008-12-23 Akira Tsuchida Work table apparatus for a stringing machine for tennis rackets
EP1980300A1 (en) * 2007-04-11 2008-10-15 Wilson Sporting Goods Company Racquet stringing machine
US7686713B2 (en) 2007-04-11 2010-03-30 Wilson Sporting Goods Co. Racquet stringing machine
US7695383B2 (en) 2007-04-11 2010-04-13 Wilson Sporting Goods Co. Racquet stringing machine
US7833118B2 (en) 2007-04-11 2010-11-16 Wilson Sporting Goods Co. Racquet stringing machine
US8075429B2 (en) 2007-04-11 2011-12-13 Wilson Sporting Goods Co. Racquet stringing machine

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Publication number Publication date
FR2551352A1 (en) 1985-03-08
FR2551352B1 (en) 1986-05-09
EP0136245A3 (en) 1985-07-31

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