EP0097566B1 - Mechanical unit to selectively drive one of at least two shafts from only one driving shaft, preferably for moving the ink ribbon of a printer - Google Patents

Mechanical unit to selectively drive one of at least two shafts from only one driving shaft, preferably for moving the ink ribbon of a printer Download PDF

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Publication number
EP0097566B1
EP0097566B1 EP19830401160 EP83401160A EP0097566B1 EP 0097566 B1 EP0097566 B1 EP 0097566B1 EP 19830401160 EP19830401160 EP 19830401160 EP 83401160 A EP83401160 A EP 83401160A EP 0097566 B1 EP0097566 B1 EP 0097566B1
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EP
European Patent Office
Prior art keywords
wheel
driven
satellite
wheels
driving
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.)
Expired
Application number
EP19830401160
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German (de)
French (fr)
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EP0097566A1 (en
Inventor
Christian Dol
Guy Chevrollier
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Sagem SA
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Sagem SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/40—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction
    • B41J33/44—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically
    • B41J33/51—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically and characterised by the use of particular reversing control means
    • B41J33/516—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically and characterised by the use of particular reversing control means using a reversing-feeler responsive to the tension of the ribbon

Definitions

  • Devices of the type under consideration find a particularly interesting, but not exclusive, application for longitudinally moving an ink ribbon in a printing machine such as for example a typewriter, teletype, computer printer, etc.
  • the driving wheel and the satellite wheel associated with it are carried by an independent support capable of moving elastically transversely with respect to the driven wheels.
  • the transverse displacement of the support occurs during an increase in the resistive torque produced by the driven wheel (for example end of the ink ribbon or blocking of the ribbon) and the satellite wheel can then be released from the driven wheel with which it previously cooperated.
  • pivot around the axis of the driving wheel and come to cooperate with the other driven wheel for example to reverse the direction of travel of the ink ribbon.
  • the transverse movement of the support does not allow the drive of the driving shaft to be carried out by a conventional cable system and it is necessary to provide a specific geared motor.
  • document DE-C-166 065 describes a wheel arranged with radial springs, interposed between the hub and the rim.
  • the object of the invention is essentially to remedy the drawbacks explained above and to produce a compact, light device comprising few parts, reliable, able to be driven by cables in a conventional manner, and inexpensive so that it can be incorporated into widely distributed printing machines at relatively low cost.
  • the torque of the driving and satellite wheels can be housed in the free space separating the two driven wheels, the axis of the driving wheel being able for example to be aligned with the two shafts of the driven wheels.
  • the mechanical structure thus formed is relatively compact, with no cantilevered parts or members, comprises a minimum number of component parts and is therefore of minimum weight and inertia compatible with the requirements required for certain applications such as equipment of a printer machine cart.
  • each driven wheel comprises a rigid or substantially rigid rim and hub joined to one another by radially deformable elastically connecting means.
  • connection means comprise several res lots arranged radially and angularly equidistant from each other, these springs can be for example helical springs or bends spokes longitudinally elastically.
  • connection means advantageously comprise a continuous annular web, interposed between hub and rim, made of a material having elastic deformation properties at least in radial directions.
  • the wheel thus formed can be easily manufactured in one piece by using molding techniques for synthetic materials.
  • the driving, satellite and driven wheels are toothed wheels and / or friction wheels.
  • a particularly preferred, although not exclusive, application of the mechanical drive device of the invention resides in a device for longitudinally moving an ink ribbon of a printing machine such as a typewriter, teletype, computer printer, etc. , the two driven wheels then cooperating respectively in rotation with two support plates for the reels for winding the ink ribbon.
  • this device is placed on the mobile carriage of the printing machine and that the driving shaft cooperates with cable drive means known per se, comprising two free wheels mounted on the drive shaft and two parallel drive cables coiled respectively around the two freewheels.
  • a driving shaft 1 drives a driving wheel 2: for example, as shown, the wheel 2 is wedged on the shaft 1.
  • a satellite wheel 3 cooperates permanently with the driving wheel 2 and is continuously driven by it; the wheel 3 is mounted idly on a support 4 (constituted for example by two lateral flanges) which can rotate freely around the axis of the driving wheel 2.
  • a first driven wheel 5 is provided which rotates a first driven shaft 6 (the wheel 5 can for example be wedged on the shaft 6) and with which the satellite wheel 3 can come into engagement.
  • a second driven wheel 7 is solid in rotation with a second driven shaft 8 (for example by being wedged on the shaft 8) and the satellite wheel 3 can come into engagement with the second driven wheel 7.
  • the axes of the driving wheel 2, of the satellite wheel 3 and of the two driven wheels 5 and 7 are mutually parallel and substantially perpendicular to a support plate 9, all the wheels being substantially coplanar.
  • the two driven wheels 5, 7 are arranged at equal distance from the axis of the driving wheel 2, this distance being less than the sum of the diameter of the satellite wheel 3 and the radius of the driving wheel 2.
  • the two driven wheels 5 and 7 are arranged to be able to undergo local radial elastic deformations; in other words, they are arranged so that their respective axes remain fixed but that their periphery can deform, or move, radially locally.
  • each wheel 5, 7 comprises a rigid hub respectively 10, 11, a rigid or substantially rigid rim respectively 12, 13, and connecting means respectively 14, 15 interposed between the rim and the hub, these connecting means being suitable to undergo radial elastic deformations.
  • the elastic means 14, 15 may for example be constituted by radial helical springs, in particular three springs arranged at 120 ° as shown. It can also be springs constituted by masses of elastomer. It can also be bent spokes curable longitudinally.
  • the connecting means 14, 15 consist of a continuous web made of a material strong enough to ensure the mechanical connection of the rim 12, 13 to the hub 10, 11, but simultaneously having elastic deformation properties at least in radial directions.
  • the wheel can be produced by double injection molding, the web being made of rubber, polyurethane, etc., and the hub and rim made of plastic.
  • connection means are constituted by the above mentioned raises or by a continuous veil.
  • the wheels used can be of any type suitable for the proper transmission of torques. They may be toothed wheels, wheels with a smooth surface having a high coefficient of friction, wheels with a grooved surface or any combination of such wheels.
  • the driving shaft 1 drives the driving wheel 2 for example in the dextrorotatory direction and itself drives the satellite wheel 3 in the senestrogyre direction.
  • the support 4 tends to rotate in the dextrorotatory direction around the axis of the wheel 2 on which it is articulated and therefore, in normal operation, the satellite wheel 3 remains engaged. against the driven wheel 5.
  • the reaction force maintaining the satellite wheel 3 applied against the driven wheel 5 is less than the radial deformation force of the means 14, it follows that the device is in the stable position shown in FIG. 1, the wheel 5 being driven in the dextrorotatory direction.
  • the reaction torque which keeps the satellite wheel 3 in abutment against the driven wheel 5 increases and, when the force thus generated becomes greater than the radial elastic force of the connection means 14, the satellite wheel 3 pushes the rim 12 of the driven wheel 5 towards the hub 10 against the radial elastic forces exerted by the connection means 14.
  • the hub 10 retains the same axis of rotation (in this case, it remains wedged on the driven shaft 6), but the rim 12 is itself off-center (FIG. 2).
  • the satellite wheel 3 then escapes contact with the driven wheel 5, then, due to the rotation caused by the reaction torque, pivots around the driving shaft 1 to come into contact with the driven wheel 7 which it drives in dextrorotatory rotation (figure 3).
  • the device of the invention is likely to find many applications among which we will note more particularly that relating to the training of ink ribbons in printing machines such as typewriters, teletypes, computer printers, etc.
  • Such an application is shown diagrammatically in FIGS. 4 to 6 to which reference is now made (and on which the elements identical to those of FIGS. 1 to 4 are designated by the same reference numerals).
  • Brakes 25, cooperating respectively with the driven wheels 5 and 7, ensure constant tensioning of the ribbon 20 (see FIG. 4).
  • the two coils 19 and 22 are selectively driven by the satellite wheel 3, in the direct direction (arrow 23) in the case of a normal drive (wheel 3 shown in solid lines) or in the direction reverse (arrow 24) in the case where the ribbon is prevented from moving in the normal direction (wheel 3 shown in phantom).
  • This assembly automatically reverses the direction of travel of the ribbon, for example at the end of the ribbon or in the event of the ribbon jamming in the normal direction (arrow 23).
  • the satellite wheel 3 turns alone around the shaft 1 without driving the driven wheels 5 and 7.
  • the assembly shown in Figures 4 to 6 is particularly interesting in that it can be installed easily, due to its compactness, on a carriage of the printing machine.
  • the driving shaft 1 does not undergo any transverse movement relative to the driven wheels and to the plate, it is not necessary to have recourse to an independent motor device, such as a geared motor; one can carry out the drive of the driving shaft 1 using a conventional drive by double cable and double freewheel, which is commonly used in printing machines.
  • a first cable 28, connected to first drive means, is wound in the dextrorotatory direction around the freewheel 26 while a second cable 29, connected to second drive means, is wound in the senestrogyre direction around the freewheel 27, so that the leading tree 1 is driven in rotation by one or the other of the free wheels 26, 27 while the carriage is moving.

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  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Transmission Devices (AREA)

Description

La présente invention concerne des perfectionnements apportés à des dispositifs mécaniques d'entraînement sélectif d'au moins deux arbres menés, à partir d'un arbre menant unique, comportant:

  • - un arbre menant entraînant une roue menante,
  • - une roue satellite entraînée en permanence par cette roue menante et montée folle sur un support pouvant tourner librement autour de l'axe de la roue menante,
  • - une première roue menée, solidaire en rotation du premier arbre mené et avec laquelle la roue satellite peut venir en prise,
  • - une deuxième roue menée, solidaire en rotation du deuxième arbre mené, et avec laquelle la roue satellite peut venir en prise,
  • - les axes de la roue menante, de la roue satellite et des deux roues menées étant parallèles et les deux arbres menés étant disposés à égale distance de l'arbre menant, cette distance étant inférieure à la somme du diamètre de la roue satellite et des rayons des roues menante et menée.
The present invention relates to improvements made to mechanical devices for selective drive of at least two driven shafts, from a single driving shaft, comprising:
  • - a driving shaft driving a driving wheel,
  • a satellite wheel permanently driven by this driving wheel and mounted idly on a support which can rotate freely around the axis of the driving wheel,
  • - a first driven wheel, integral in rotation with the first driven shaft and with which the satellite wheel can come into engagement,
  • - a second driven wheel, integral in rotation with the second driven shaft, and with which the satellite wheel can come into engagement,
  • the axes of the driving wheel, of the satellite wheel and of the two driven wheels being parallel and the two driven shafts being arranged at equal distance from the driving shaft, this distance being less than the sum of the diameter of the satellite wheel and of the driving and driven wheel spokes.

Les dispositifs du genre considéré trouvent une application particulièrement intéressante, mais non exclusive, pour déplacer longitudinalement un ruban encreur dans une machine imprimante telle que par exemple machine à écrire, télétype, imprimante d'ordinateur, etc.Devices of the type under consideration find a particularly interesting, but not exclusive, application for longitudinally moving an ink ribbon in a printing machine such as for example a typewriter, teletype, computer printer, etc.

Dans un dispositif connu de par le brevet FR. 2 198 586, la roue menante et la roue satellite qui lui est associée sont portées par un support indépendant susceptible de se déplacer de façon élastique transversalement par rapport aux roues menées. Le déplacement transversal du support se produit lors d'une augmentation du couple résistant produit par la roue menée (par exemple fin du ruban encreur ou blocage du ruban) et la roue satellite peut alors se dégager de la roue menée avec laquelle elle coopérait jusque-là, pivoter autour de l'axe de la roue menante et venir coopérer avec l'autre roue menée, par exemple pour inverser le sens de défilement du ruban encreur.In a device known from the FR patent. 2 198 586, the driving wheel and the satellite wheel associated with it are carried by an independent support capable of moving elastically transversely with respect to the driven wheels. The transverse displacement of the support occurs during an increase in the resistive torque produced by the driven wheel (for example end of the ink ribbon or blocking of the ribbon) and the satellite wheel can then be released from the driven wheel with which it previously cooperated. there, pivot around the axis of the driving wheel and come to cooperate with the other driven wheel, for example to reverse the direction of travel of the ink ribbon.

Dans ce dispositif connu, le fait que le support de la roue menante doit pouvoir se déplacer transversalement conduit à positionner ledit support sur le côté du châssis supportant les roues menées et les organes y associés, d'où un accroissement de l'encombrement du dispositif. Il s'ensuit également que les courses d'échappement de la roue satellite ne sont pas exactement les mêmes selon qu'elle passe de la première roue menée à la seconde roue menée ou inversement: il en résulte des temps de réponse différents qui peuvent constituer un inconvénient dans certaines conditions d'utilisation.In this known device, the fact that the support of the driving wheel must be able to move transversely leads to positioning said support on the side of the chassis supporting the driven wheels and the associated members, thereby increasing the size of the device. . It also follows that the escape strokes of the satellite wheel are not exactly the same depending on whether it passes from the first driven wheel to the second driven wheel or vice versa: this results in different response times which can constitute a disadvantage under certain conditions of use.

De plus, le débattement transversal du support n'autorise pas que l'entraînement de l'arbre menant puisse être effectué par un classique système à câbles et il est nécessaire de prévoir un motoréducteur spécifique.In addition, the transverse movement of the support does not allow the drive of the driving shaft to be carried out by a conventional cable system and it is necessary to provide a specific geared motor.

Il en résulte que le poids du dispositif devient alors important et le chariot de la machine imprimante qui est ainsi équipé présente une inertie trop grande.As a result, the weight of the device then becomes significant and the carriage of the printing machine which is thus equipped has too great an inertia.

Enfin, le coût d'un dispositif de ce genre est trop élevé, en particulier à cause de la présence du motoréducteur qui, devant être fiable, est relativement onéreux.Finally, the cost of a device of this kind is too high, in particular because of the presence of the geared motor which, having to be reliable, is relatively expensive.

Par ailleurs, le document DE-C-166 065 décrit une roue agencée avec des ressorts radiaux, interposés entre le moyeu et la jante.Furthermore, document DE-C-166 065 describes a wheel arranged with radial springs, interposed between the hub and the rim.

L'invention a essentiellement pour objet de remédier aux inconvénients ci-dessus exposés et de réaliser un dispositif compact, léger, comportant peu de pièces, fiable, apte à être entraîné par câbles de façon classique, et peu coûteux de manière qu'il puisse être incorporé dans des machines imprimantes de grande diffusion de prix relativement modique.The object of the invention is essentially to remedy the drawbacks explained above and to produce a compact, light device comprising few parts, reliable, able to be driven by cables in a conventional manner, and inexpensive so that it can be incorporated into widely distributed printing machines at relatively low cost.

A ces fins, le dispositif de l'invention se caractérisé par le fait que:

  • - l'arbre menant est disposé de manière à être sensiblement aligné avec les deux arbres menés;
  • - les deux roues menées sont agencées pour être élastiquement déformables de façon locale selon une direction radiale;
  • - et la distance entre chaque arbre mené et l'arbre menant est inférieure à la somme du diamètre de la roue satellite et des rayons des roues menante et menée d'une valeur correspondant à la possibilité de déformation radiale de chacune des deux susdites roues menées.
For these purposes, the device of the invention is characterized in that:
  • - The driving shaft is arranged so as to be substantially aligned with the two driven trees;
  • - The two driven wheels are arranged to be elastically deformable locally in a radial direction;
  • - And the distance between each driven shaft and the driving shaft is less than the sum of the diameter of the satellite wheel and the spokes of the driving and driven wheels by a value corresponding to the possibility of radial deformation of each of the above two driven wheels .

Grâce à cet agencement, lorsque l'un des deux arbres menés est bloqué, la roue satellite prend appui sur la roue menée correspondante, provoque sa déformation élastique radiale et, en roulant sur sa circonférence, arrive à échapper à son contact, ce qui permet alors au support de cette roue satellite de se déplacer angulairement jusqu'à ce que la roue satellite vienne en prise avec l'autre roue menée pour l'entraîner en rotation et entraîner ainsi l'autre arbre mené, l'ensemble de ce processus pouvant alors se répéter lorsque cet autre arbre mené est lui-même bloqué.Thanks to this arrangement, when one of the two driven shafts is blocked, the satellite wheel bears on the corresponding driven wheel, causes its radial elastic deformation and, by rolling around its circumference, manages to escape its contact, which allows then the support of this satellite wheel to move angularly until the satellite wheel comes into engagement with the other driven wheel to drive it in rotation and thus drive the other driven shaft, the whole of this process can then repeat itself when this other driven tree is itself blocked.

Il en résulte que le couple des roues menante et satellite peut être logé dans l'espace libre séparant les deux roues menées, l'axe de la roue menante pouvant par exemple être aligné avec les deux arbres des roues menées. La structure mécanique ainsi constituée est relativement compacte, sans parties ou organes en porte à faux, comprend un nombre minimum de pièces composantes et est donc d'un poids et d'une inertie minimales compatibles avec les exigences requises pour certaines applications telles que l'équipement d'un chariot de machine imprimante.As a result, the torque of the driving and satellite wheels can be housed in the free space separating the two driven wheels, the axis of the driving wheel being able for example to be aligned with the two shafts of the driven wheels. The mechanical structure thus formed is relatively compact, with no cantilevered parts or members, comprises a minimum number of component parts and is therefore of minimum weight and inertia compatible with the requirements required for certain applications such as equipment of a printer machine cart.

Dans un mode de réalisation préféré, chaque roue menée comprend une jante et un moyeu rigides ou sensiblement rigides réunis l'un à l'autre par des moyens de liaison radialement déformables de façon élastique.In a preferred embodiment, each driven wheel comprises a rigid or substantially rigid rim and hub joined to one another by radially deformable elastically connecting means.

Il est alors possible de faire en sorte que les moyens de liaison comprennent plusieurs ressorts disposés radialement et angulairement équidistants les uns des autres, ces ressorts pouvant être par exemple des ressorts hélicoïdaux ou bien des rais cintrables longitudinalement de façon élastique.It is then possible to make the connection means comprise several res lots arranged radially and angularly equidistant from each other, these springs can be for example helical springs or bends spokes longitudinally elastically.

Toutefois, pour un montage plus simple et un moindre coût de fabrication, les susdits moyens de liaison comprennent avantageusement un voile annulaire continu, interposé entre moyeu et jante, constitué en un matériau présentant des propriétés de déformation élastique au moins selon des directions radiales.However, for simpler mounting and lower manufacturing cost, the above connection means advantageously comprise a continuous annular web, interposed between hub and rim, made of a material having elastic deformation properties at least in radial directions.

Dans un cas comme dans l'autre, la roue ainsi constituée peut être facilement fabriquée d'une seule pièce par mise en oeuvre des techniques de moulage de matières synthétiques.In either case, the wheel thus formed can be easily manufactured in one piece by using molding techniques for synthetic materials.

Les roues menante, satellite et menées sont des roues dentées et/ou des roues à friction.The driving, satellite and driven wheels are toothed wheels and / or friction wheels.

Une application particulièrement préférée, bien que non exclusive, du dispositif mécanique d'entraînement de l'invention réside dans un dispositif pour déplacer longitudinalement un ruban encreur d'une machine imprimante telle que machine à écrire, télétype, imprimante d'ordinateur, etc., les deux roues menées coopérant alors respectivement en rotation avec deux plateaux de support des bobines d'enroulement du ruban encreur.A particularly preferred, although not exclusive, application of the mechanical drive device of the invention resides in a device for longitudinally moving an ink ribbon of a printing machine such as a typewriter, teletype, computer printer, etc. , the two driven wheels then cooperating respectively in rotation with two support plates for the reels for winding the ink ribbon.

On obtient ainsi un dispositif à inversion automatique du sens de défilement du ruban encreur, en particulier en bout de ruban ou en cas du blocage du ruban, possédant également la faculté de patiner (échappement de la roue satellite alternativement sur les deux roues menées) en cas de blocage complet (dans les deux sens de défilement possibles) du ruban.This gives a device for automatically reversing the direction of travel of the ink ribbon, in particular at the end of the ribbon or in the event of the ribbon jamming, also having the ability to skate (escape of the satellite wheel alternately on the two driven wheels) by case of complete blockage (in both possible directions of travel) of the ribbon.

On confère ainsi au dispositif de déplacement du ruban les avantages que possèdent les cassettes à ruban encreur tout en conservant des rouleaux de ruban normalisés auxquels bon nombre d'utilisateurs souhaitent rester fidèles notamment en raison de leur mondre prix.The advantages of the ink ribbon cassettes are thus given to the ribbon displacement device while retaining standardized rolls of ribbon to which many users wish to remain loyal, in particular because of their low price.

Dans ce contexte, il est possible de faire en sorte que ce dispositif soit disposé sur le chariot mobile de la machine imprimante et que l'arbre menant coopère avec des moyens d'entraînement à câbles en soi connus, comprenant deux roues libres montées sur l'arbre menant et deux câbles parallèles d'entraînement lovés respectivement autour des deux roues libres.In this context, it is possible to ensure that this device is placed on the mobile carriage of the printing machine and that the driving shaft cooperates with cable drive means known per se, comprising two free wheels mounted on the drive shaft and two parallel drive cables coiled respectively around the two freewheels.

On écarte ainsi la solution antérieure, trop coûteuse, de l'entraînement à l'aide d'un motoréducteur, et il est possible de réaliser un dispositif technologiquement simple et peu coûteux, mais particulièrement performant dans ses applications plus spécifiquement envisagées.This eliminates the previous solution, which is too expensive, of the drive using a geared motor, and it is possible to produce a device which is technologically simple and inexpensive, but which is particularly effective in its more specifically envisaged applications.

L'invention sera mieux comprise à la lecture de la description qui suit d'un mode de réalisation préféré donné uniquement à titre d'exemple illustratif; dans cette description, on se réfère aux dessins annexés dans lesquels:

  • - les figures 1 à 3 représentent un dispositif mécanique d'entraînement agencé conformément à l'invention, respectivement dans trois positions fonctionnelles différentes,
  • - la figure 4 représente un dispositif pour entraîner un ruban encreur de machine imprimante agencé conformément à l'invention,
  • - la figure 5 est une vue schématique de côté du dispositif de la figure 4 avec un entraînement par deux câbles parallèles, et
  • - la figure 6 est une vue de dessous d'une partie de la figure 5.
The invention will be better understood on reading the following description of a preferred embodiment given solely by way of illustrative example; in this description, reference is made to the appended drawings in which:
  • FIGS. 1 to 3 represent a mechanical drive device arranged in accordance with the invention, respectively in three different functional positions,
  • FIG. 4 represents a device for driving an ink ribbon of a printing machine arranged in accordance with the invention,
  • FIG. 5 is a schematic side view of the device in FIG. 4 with a drive by two parallel cables, and
  • - Figure 6 is a bottom view of part of Figure 5.

En se référant tout d'abord à la figure 1, un arbre menant 1 entraîne une roue menante 2: par exemple, comme représenté, la roue 2 est calée sur l'arbre 1. Une roue satellite 3 coopère en permanence avec la roue menante 2 et est entraînée en permanence par celle-ci; la roue 3 est montée folle sur un support 4 (constitué par exemple par deux flasques latéraux) pouvant tourner librement autour de l'axe de la roue menante 2.Referring first to FIG. 1, a driving shaft 1 drives a driving wheel 2: for example, as shown, the wheel 2 is wedged on the shaft 1. A satellite wheel 3 cooperates permanently with the driving wheel 2 and is continuously driven by it; the wheel 3 is mounted idly on a support 4 (constituted for example by two lateral flanges) which can rotate freely around the axis of the driving wheel 2.

Par ailleurs, on prévoit une première roue menée 5 solidiare en rotation d'un premier arbre mené 6 (la roue 5 peut par exemple être calée sur l'arbre 6) et avec laquelle la roue satellite 3 peut venir en prise. Une seconde roue menée 7 est solidiare en rotation d'un second arbre mené 8 (par exemple en étant calée sur l'arbre 8) et la roue satellite 3 peut venir en prise avec la seconde roue menée 7.Furthermore, a first driven wheel 5 is provided which rotates a first driven shaft 6 (the wheel 5 can for example be wedged on the shaft 6) and with which the satellite wheel 3 can come into engagement. A second driven wheel 7 is solid in rotation with a second driven shaft 8 (for example by being wedged on the shaft 8) and the satellite wheel 3 can come into engagement with the second driven wheel 7.

On notera que les axes de la roue menante 2, de la roue satellite 3 et des deux roues menées 5 et 7 sont parallèles entre eux et sensiblement perpendiculaires à une platine de support 9, toutes les roues étant sensiblement coplanaires.It will be noted that the axes of the driving wheel 2, of the satellite wheel 3 and of the two driven wheels 5 and 7 are mutually parallel and substantially perpendicular to a support plate 9, all the wheels being substantially coplanar.

Les deux roues menées 5, 7 sont disposées à égale distance de l'axe de la roue menante 2, cette distance étant inférieure à la somme du diamètre de la roue satellite 3 et du rayon de la roue menante 2.The two driven wheels 5, 7 are arranged at equal distance from the axis of the driving wheel 2, this distance being less than the sum of the diameter of the satellite wheel 3 and the radius of the driving wheel 2.

En outre, les deux roues menées 5 et 7 sont agencées pour pouvoir subir des déformations élastiques radiales locales; autrement dit, elles sont agencées de manière que leurs axes respectifs restent fixes mais que leur périphérie puisse se déformer, ou se déplacer, radialement de façon locale.In addition, the two driven wheels 5 and 7 are arranged to be able to undergo local radial elastic deformations; in other words, they are arranged so that their respective axes remain fixed but that their periphery can deform, or move, radially locally.

Avantageusement, chaque roue 5, 7 comporte un moyeu rigide respectivement 10, 11, une jante rigide ou sensiblement rigide respectivement 12, 13, et des moyens de liaison respectivement 14, 15 interposés entre la jante et le moyeu, ces moyens de liaison étant aptes à subir des déformations élastiques radiales.Advantageously, each wheel 5, 7 comprises a rigid hub respectively 10, 11, a rigid or substantially rigid rim respectively 12, 13, and connecting means respectively 14, 15 interposed between the rim and the hub, these connecting means being suitable to undergo radial elastic deformations.

Les moyens élastiques 14, 15 peuvent par exemple être constitués par des ressorts hélicoïdaux radiaux, notamment trois ressorts disposés à 120° comme représenté. Il peut s'sagir aussi de ressorts constitués par des masses d'élastomère. Il peut aussi s'agir de rais cintrés incurvables longitudinalement.The elastic means 14, 15 may for example be constituted by radial helical springs, in particular three springs arranged at 120 ° as shown. It can also be springs constituted by masses of elastomer. It can also be bent spokes curable longitudinally.

Toutefois, de façon pratique, les moyens de liaison 14, 15 sont constitués par un voile continu constitué en un matériau suffisamment résistant pour assurer la liaison mécanique de la jante 12, 13 au moyeu 10, 11, mais présentant simultanément des propriétés de déformation élastique au moins selon des directions radiales. Par exemple, la roue peut être fabriquée par moulage à double injection, le voile étant constitué en caoutchouc, polyuréthane, etc., et le moyeu et la jante en matière plastique.However, in practical terms, the connecting means 14, 15 consist of a continuous web made of a material strong enough to ensure the mechanical connection of the rim 12, 13 to the hub 10, 11, but simultaneously having elastic deformation properties at least in radial directions. For example, the wheel can be produced by double injection molding, the web being made of rubber, polyurethane, etc., and the hub and rim made of plastic.

Bien entendu, dans le cas où le matériau retenu sera une matière synthétique moulable, l'ensemble de la roue (moyeu, jante et moyens de liaison) peut être fabriqué d'un seul tenant par moulage, que les moyens de liaison soient constitués par les rais susmentionnés ou par un voile continu.Of course, in the case where the material selected will be a moldable synthetic material, the whole of the wheel (hub, rim and connection means) can be manufactured in one piece by molding, that the connection means are constituted by the above mentioned raises or by a continuous veil.

Bien que la disposition qui vient d'être décrite semble devoir être la plus intéressante aussi bien du point de vue fabrication que du point de vue utilisation, on n'exclut toutefois pas d'autres solutions telles que par exemple une jante déformable localement en direction radiale.Although the arrangement which has just been described seems to be the most advantageous both from the manufacturing point of view and from the use point of view, it is not however excluded other solutions such as for example a rim locally deformable in the direction radial.

Les roues utilisées peuvent être indifféremment de tous types appropriés pour la transmission convenable des couples. Il peut s'agir de roues dentées, de roues à surface lisse présentant un grand coefficient de frottement, de roues à surface cannelée ou de toute combinaison de telles roues.The wheels used can be of any type suitable for the proper transmission of torques. They may be toothed wheels, wheels with a smooth surface having a high coefficient of friction, wheels with a grooved surface or any combination of such wheels.

Le fonctionnement du dispositif de l'invention est le suivant.The operation of the device of the invention is as follows.

L'arbre menant 1 entraîne la roue menante 2 par exemple dans le sens dextrogyre et elle-même entraîne la roue satellite 3 dans le sens senestrogyre. Sous l'action du couple de réaction, le support 4 tend à tourner dans le sens dextrogyre autour de l'axe de la roue 2 sur lequel il est articulé et de ce fait, en fonctionnement normal, la roue satellite 3 reste appliquée en prise contre la roue menée 5. Compte tenu des rapports de distance précédemment mentionnés entre les différentes roues, et du fait que l'effort de réaction maintenant la roue satellite 3 appliquée contre la roue menée 5 est inférieur à l'effort de déformation radiale des moyens 14, il en résulte que le dispositif est dans la position stable représentée à la figure 1, la roue 5 étant entraînée dans le sens dextrogyre.The driving shaft 1 drives the driving wheel 2 for example in the dextrorotatory direction and itself drives the satellite wheel 3 in the senestrogyre direction. Under the action of the reaction torque, the support 4 tends to rotate in the dextrorotatory direction around the axis of the wheel 2 on which it is articulated and therefore, in normal operation, the satellite wheel 3 remains engaged. against the driven wheel 5. Taking into account the previously mentioned distance ratios between the different wheels, and the fact that the reaction force maintaining the satellite wheel 3 applied against the driven wheel 5 is less than the radial deformation force of the means 14, it follows that the device is in the stable position shown in FIG. 1, the wheel 5 being driven in the dextrorotatory direction.

Si le couple résistant vient à augmenter pour une raison quelconque (par exemple freinage ou blocage de la roue menée 5), le couple de réaction qui maintient la roue satellite 3 en appui contre la roue menée 5 augmente et, lorsque l'effort ainsi engendré devient supérieur à l'effort élastique radial des moyens de liaison 14, la roue satellite 3 repousse la jante 12 de la roue menée 5 en direction du moyeu 10 à l'encontre des forces élastiques radiales exercées par les moyens de liaison 14. Autrement dit, le moyeu 10 conserve le même axe de rotation (en l'occurrence, il reste calé sur l'arbre mené 6), mais la jante 12 est, elle, décentrée (figure 2).If the resistive torque increases for any reason (for example braking or blocking of the driven wheel 5), the reaction torque which keeps the satellite wheel 3 in abutment against the driven wheel 5 increases and, when the force thus generated becomes greater than the radial elastic force of the connection means 14, the satellite wheel 3 pushes the rim 12 of the driven wheel 5 towards the hub 10 against the radial elastic forces exerted by the connection means 14. In other words , the hub 10 retains the same axis of rotation (in this case, it remains wedged on the driven shaft 6), but the rim 12 is itself off-center (FIG. 2).

La roue satellite 3 échappe ensuite au contact de la roue menée 5, puis, du fait de la rotation provoquée par le couple de réaction, pivote autour de l'arbre menant 1 pour venir au contact de la roue menée 7 qu'elle entraîne en rotation dextrogyre (figure 3).The satellite wheel 3 then escapes contact with the driven wheel 5, then, due to the rotation caused by the reaction torque, pivots around the driving shaft 1 to come into contact with the driven wheel 7 which it drives in dextrorotatory rotation (figure 3).

Si, de son côté, la roue menée 7 est elle aussi bloquée, le phénomène d'échappement se renouvelle de la même manière, et la roue satellite 3 pivote autour de l'arbre 1 en repoussant alternativement les roues menées 5 et 7.If, for its part, the driven wheel 7 is also blocked, the escape phenomenon is renewed in the same way, and the satellite wheel 3 pivots around the shaft 1 by alternately pushing the driven wheels 5 and 7.

Le dispositif de l'invention est susceptible de trouver de nombreuses applications parmi lesquelles on retiendra plus particulièrement celle relative à l'entraînement des rubans encreurs dans les machines imprimantes telles que machines à écrire, télétypes, imprimantes d'ordinateur, etc. Une telle application est schématisée aux figures 4 à 6 auxquelles on se réfère maintenant (et sur lesquelles les éléments identiques à ceux des figures 1 à 4 sont désignés par les mêmes références numériques).The device of the invention is likely to find many applications among which we will note more particularly that relating to the training of ink ribbons in printing machines such as typewriters, teletypes, computer printers, etc. Such an application is shown diagrammatically in FIGS. 4 to 6 to which reference is now made (and on which the elements identical to those of FIGS. 1 to 4 are designated by the same reference numerals).

Le montage représenté aux figures 1 à 3 est complété par une roue d'entraînement supplémentaire 16 calée sur le premier arbre mené 6 et qui est en prise avec une roue 17 de même diamètre calée sur l'arbre de rotation d'un premier plateau 18 supportant l'une des bobines 19 du ruban encreur 20.The assembly shown in Figures 1 to 3 is completed by an additional drive wheel 16 wedged on the first driven shaft 6 and which is engaged with a wheel 17 of the same diameter wedged on the rotation shaft of a first plate 18 supporting one of the coils 19 of the ink ribbon 20.

Sur le second arbre mené 8 est calé un seconde plateau 21 supportant l'autre bobine 22 du ruban 20.On the second driven shaft 8 is wedged a second plate 21 supporting the other coil 22 of the ribbon 20.

Des freins 25, coopérant respectivement avec les roues menées 5 et 7, assurent une mise sous tension constante du ruban 20 (voir figure 4).Brakes 25, cooperating respectively with the driven wheels 5 and 7, ensure constant tensioning of the ribbon 20 (see FIG. 4).

Grâce à cet agencement, les deux bobines 19 et 22 sont entraînées de façon sélective par la roue satellite 3, dans le sens direct (flèche 23) dans le cas d'un entraînement normal (roue 3 représentée en trait plein) ou dans le sens inverse (flèche 24) dans le cas où le ruban est empêché de se déplacer dans le sens normal (roue 3 représentée en trait mixte).Thanks to this arrangement, the two coils 19 and 22 are selectively driven by the satellite wheel 3, in the direct direction (arrow 23) in the case of a normal drive (wheel 3 shown in solid lines) or in the direction reverse (arrow 24) in the case where the ribbon is prevented from moving in the normal direction (wheel 3 shown in phantom).

Ce montage réalise l'inversion automatique du sens de défilement du ruban, par exemple en fin de ruban ou en cas de blocage du ruban dans le sens normal (flèche 23). Dans le cas où le ruban est totalement bloqué, la roue satellite 3 tourne seule autour de l'arbre 1 sans entraîner les roues menées 5 et 7.This assembly automatically reverses the direction of travel of the ribbon, for example at the end of the ribbon or in the event of the ribbon jamming in the normal direction (arrow 23). In the case where the ribbon is completely blocked, the satellite wheel 3 turns alone around the shaft 1 without driving the driven wheels 5 and 7.

Le montage représente aux figures 4 à 6 est particulièrement intéressant dans la mesure où il peut être installé facilement, du fait de sa compacité, sur un chariot de machine imprimante. En outre, comme l'arbre menant 1 ne subit aucun déplacement transversal par rapport aux roues menées et à la platine, il n'est pas nécessaire d'avoir recours à un dispositif moteur, tel qu'un motoréducteur, indépendant; on peut effectuer l'entraînement de l'arbre menant 1 à l'aide d'un classique entraînement par double câble et double roue libre, qui est couramment utilisé dans les machines imprimantes.The assembly shown in Figures 4 to 6 is particularly interesting in that it can be installed easily, due to its compactness, on a carriage of the printing machine. In addition, as the driving shaft 1 does not undergo any transverse movement relative to the driven wheels and to the plate, it is not necessary to have recourse to an independent motor device, such as a geared motor; one can carry out the drive of the driving shaft 1 using a conventional drive by double cable and double freewheel, which is commonly used in printing machines.

Comme représenté aux figures 5 et 6, deux roues libres 26 et 27 (de même sens d'entraînement) sont calées, l'une au-dessus de l'autre, sur l'arbre menant 1. Un premier câble 28, raccordé à des premiers moyens moteurs, est enroulé dans le sens dextrogyre autour de la roue libre 26 tandis qu'un second câble 29, raccordé à des seconds moyens moteurs, est enroulé dans le sens senestrogyre autour de la roue libre 27, de telle manière que l'arbre menant 1 soit entraîne en rotation par l'une ou l'autre des roues libres 26, 27 alors que le chariot se déplace.As shown in FIGS. 5 and 6, two free wheels 26 and 27 (of the same drive direction) are wedged, one above the other, on the driving shaft 1. A first cable 28, connected to first drive means, is wound in the dextrorotatory direction around the freewheel 26 while a second cable 29, connected to second drive means, is wound in the senestrogyre direction around the freewheel 27, so that the leading tree 1 is driven in rotation by one or the other of the free wheels 26, 27 while the carriage is moving.

Comme il va de soi et comme il résulte d'ailleurs déjà de ce qui précède, l'invention ne se limite nullement à ceux de ses modes d'application et de réalisation qui ont été plus spécialement envisagés; elle en embrasse, au contraire, toutes les variantes.As goes without saying and as it already follows from the foregoing, the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all its variants.

Claims (7)

1. A mechanical device for selectively driving at least two driven shafts, from a single drive shaft, comprising:
- drive shaft (1) driving a driving wheel (2),
- a satellite wheel (3) permanently driven by said driving wheel (2) and loosely mounted on a support (4) which is freely rotatable about the axis of the driving wheel (2),
- a first driven wheel (5), rigidly affixed to the first driven shaft (6) for rotation therewith and with which the satellite wheel (3) can come into engagement,
- a second driven wheel (7) rigidly affixed to the second driven shaft (8) for rotation therewith, and with which the satellite wheel (3) can come into engagement,
- the axes of the driving wheel (2), of the satellite wheel (3) and of the two driven wheels (5, 7) being parallel, and said two driven shafts (6, 8) being disposed at equal distance from the drive shaft (1), said distance being less than the sum of the diameter of the satellite wheel (3) and of the radius of the driving wheel (2) and of the driven wheel (5, 7), characterized by the fact that:
- the drive shaft (1) is disposed so as to be substantially in alignment with the two driven shafts (6, 8),
- the two driven wheels (5, 7) are adapted to be elastically deformable locally in a radial direction,
- and the distance between each driven shaft (6, 8) and the drive shaft (1) being less than the sum of the diameter of the satellite wheel (3) and of the radius of the driving wheel (1) and of the driven wheel (5, 7) by a value corresponding to the amount of possible radial deformation of each of the two said driven wheels (5, 7), whereby, when one of the two driven shafts is jammed, the satellite wheel bears on the corresponding driven wheel, causes elastic radial deformation thereof and, by rolling over its circumference, succeeds in escaping from contact therewith, thereby allowing the support of this satellite wheel to move angularly until the satellite wheel is engaged with the other driven wheel to rotate it and thus to drive the other driven shaft, the whole of this procedure then being repeatable when said other driven shaft is itself jammed.
2. The mechanical device according to claim 1, characterized in that each driven wheel (5,7) comprises a rim (12,13) and a hub (10, 11) which are rigid or substantially rigid and which are joined together by elastically radially deformable connecting means (14, 15).
3. The mechanical device according to claim 2, characterized in that said connecting means (14, 15) comprise several springs disposed radially and angularly equidistant from each other.
4. The mechanical device according to claim 2, characterized in that said connecting means comprise a continuous annular web, interposed between hub and rim, formed from a material having elastic deformation properties at least in radial directions.
5. The mechanical device according to any one of claims 1 to 4, characterized in that the driving, satellite and driven wheels are toothed wheels and/or friction wheels.
6. A device for longitudinally moving an inking ribbon of a printing machine, characterized in that it comprises a mechanical driving device according to any one of claims 1 to 5, the two driven wheels (5, 7) cooperating respectively in rotation with two plates (18, 21) supporting winding spools (19, 22) of the inking ribbon.
7. The device according to claim 6, characterized in that it is disposed on the mobile carriage of the printing machine and in that the drive shaft (1) cooperates with cable drive means (26 to 29) known per se comprising two free wheels (26, 27) mounted on the drive shaft and two parallel drive cables (28, 29) coiled respectively about said two free wheels.
EP19830401160 1982-06-17 1983-06-07 Mechanical unit to selectively drive one of at least two shafts from only one driving shaft, preferably for moving the ink ribbon of a printer Expired EP0097566B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8210607 1982-06-17
FR8210607A FR2528929B1 (en) 1982-06-17 1982-06-17 IMPROVEMENTS IN MECHANICAL DEVICES FOR SELECTIVE DRIVING OF AT LEAST TWO SHAFTS DRIVEN FROM A SINGLE DRIVING SHAFT, IN PARTICULAR FOR THE LONGITUDINAL MOVEMENT OF AN INK RIBBON IN A PRINTING MACHINE

Publications (2)

Publication Number Publication Date
EP0097566A1 EP0097566A1 (en) 1984-01-04
EP0097566B1 true EP0097566B1 (en) 1987-06-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830401160 Expired EP0097566B1 (en) 1982-06-17 1983-06-07 Mechanical unit to selectively drive one of at least two shafts from only one driving shaft, preferably for moving the ink ribbon of a printer

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EP (1) EP0097566B1 (en)
JP (1) JPS596460A (en)
DE (1) DE3371883D1 (en)
FR (1) FR2528929B1 (en)
YU (1) YU134183A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8800650A (en) * 1988-03-16 1989-10-16 Jan Kelders INK CASSETTE.
US4850725A (en) * 1988-06-15 1989-07-25 Ncr Corporation Unidirectional ribbon drive mechanism
JP5857576B2 (en) * 2011-09-21 2016-02-10 アイシン精機株式会社 Multiple output switching mechanism
WO2014074780A1 (en) * 2012-11-12 2014-05-15 Siemens Healthcare Diagnostics Inc. Single drive mechanism
JP7395912B2 (en) 2019-09-30 2023-12-12 ブラザー工業株式会社 Printing cassette and printing device
JP7347077B2 (en) 2019-09-30 2023-09-20 ブラザー工業株式会社 printing cassette
JP7306197B2 (en) 2019-09-30 2023-07-11 ブラザー工業株式会社 Printer and cassette for printing

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE166065C (en) *
US2583385A (en) * 1947-01-11 1952-01-22 Morse Instr Company Automatically operated film winding mechanism
DE2119414C3 (en) * 1971-04-21 1979-08-16 Nixdorf Computer Ag, 4790 Paderborn Ribbon transport and switching device arranged on a type carrier trolley, especially for mosaic printing units
IT967080B (en) * 1972-09-01 1974-02-28 Honeywell Inf Systems DEVICE FOR AUTOMATIC REVERSAL OF THE LONGITUDINAL MOVEMENT OF THE INKED RIBBON IN WRITING AND SIMILAR MACHINES
DE2737096A1 (en) * 1977-08-17 1979-03-01 Siemens Ag Reversible drive for ink ribbon of line printer - has gear train with output gear mounted on pivoted arm which is latched in position
DE3175652D1 (en) * 1980-11-10 1987-01-15 Wheel Dev Ltd Wheel with resilient spokes

Also Published As

Publication number Publication date
JPS596460A (en) 1984-01-13
DE3371883D1 (en) 1987-07-09
FR2528929A1 (en) 1983-12-23
YU134183A (en) 1987-02-28
EP0097566A1 (en) 1984-01-04
FR2528929B1 (en) 1988-04-08

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