EP2735923B1 - Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device - Google Patents

Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device Download PDF

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Publication number
EP2735923B1
EP2735923B1 EP13189578.1A EP13189578A EP2735923B1 EP 2735923 B1 EP2735923 B1 EP 2735923B1 EP 13189578 A EP13189578 A EP 13189578A EP 2735923 B1 EP2735923 B1 EP 2735923B1
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EP
European Patent Office
Prior art keywords
piezoelectric actuator
electric motor
wheel
gear wheels
memory alloy
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EP13189578.1A
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German (de)
French (fr)
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EP2735923A1 (en
Inventor
Pascal Lagorgette
Joerg Berthoud
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ETA SA Manufacture Horlogere Suisse
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ETA SA Manufacture Horlogere Suisse
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Priority to EP13189578.1A priority Critical patent/EP2735923B1/en
Publication of EP2735923A1 publication Critical patent/EP2735923A1/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/12—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by piezoelectric means; driven by magneto-strictive means

Definitions

  • the present invention relates to a drive mechanism of one or more needles and / or at least one date disc of an electromechanical watch, which is provided with a locking or clutch device.
  • the electro-mechanical watch is time-stamped by hands, which are driven by one or two or three wheels of a set of gear wheels of the drive mechanism.
  • An electric motor drives the set of gear wheels to advance or retreat the needles and / or at least one date disc.
  • the locking or clutching device is provided for momentarily blocking a part of the set of gear wheels to prevent a shift, in particular of the needles in the event of shock of the watch, and while leaving free the advance of the needles for displaying or setting the time.
  • the needles are generally driven via a set or gear train, which can be activated by a Lavet type electric stepper motor.
  • the needles are driven stepwise by one or two wheels of the gear train by means of activation of the stepper motor.
  • a large positioning torque on the stepper motor may allow the use of time indicating hands having a large unbalance.
  • These needles can be bigger or heavier.
  • the positioning torque of the electric motor can keep the needles in position, but an offset of said time indicating hands may occur, which is a disadvantage of an electro watch. -mechanical state of the art.
  • the main purpose of the invention is therefore to overcome the aforementioned drawbacks by proposing an electromechanical watch with a needle drive mechanism and / or at least one date disk, which is provided with a locking device enabling to increase the unbalance and the inertia of the needles driven by an engine with a reduced power consumption.
  • the present invention relates to an electromechanical watch with a drive mechanism for one or more needles and / or at least one date disc of an electromechanical watch, which is provided with a device locking device, which comprises the features of the independent claims 1 and 2.
  • An advantage of the drive mechanism according to the invention lies in the fact that it allows the electric motor to have a relatively low positioning torque only to define the rest position of the rotor, but more to retain the needle or needles to strong unbalance in case of shock of the watch.
  • the piezoelectric element or actuator allows directly or in combination with a lock to lock a wheel of a set of gear wheels.
  • the set of gear wheels is driven by the electric motor, which may be a stepper motor, to advance or retreat the needle or needles including time indication.
  • the latch held by the piezoelectric actuator makes it possible to make a wheel of the set of gear wheels, a frame or a platen of the watch integral between each driving action of the electric motor.
  • the latch By activating the piezoelectric actuator by an electrical signal, the latch can be moved to release said wheel for advance or retraction of one or more needles by means of the electric motor.
  • the piezoelectric actuator it can also be used an electroactive polymer element or a shape memory alloy element, which can heat up to the passage of a current and thus be deformed.
  • Another advantage of using a piezoelectric actuator to lock at least one wheel of a set of gear wheels between each action of the electric motor is that it is possible to have a power consumption less than or equal to traditional mechanism. Better performance, especially keeping needles with high unbalance in case of mechanical shocks, can be noticed by the blocking generated by the piezoelectric actuator.
  • the piezoelectric actuator can generate a large blocking force of at least one wheel of the set of gear wheels.
  • the needle drive mechanism is essentially a timepiece movement provided with an electric motor, which is controlled by a processor clocked by a time base circuit.
  • the mechanism is provided with a locking or clutch device capable of locking at least one wheel of the mechanism between two actuations of advance or recoil of the needles, which are generated by the electric motor.
  • the figure 1 schematically represents the various elements, which make up the mechanism 1 for driving one or more needles 8, 9 and / or at least one date disk not shown, an electromechanical watch.
  • the various elements described below are illustrated without necessarily respecting their actual dimensions for simplification and clarity of description.
  • the mechanism 1 comprises firstly an electric motor 2 and a set of gear wheels 3, 4, 5, 6 and 7, which is arranged between the electric motor and at least needles 8, 9 especially to advance or move the hands 8, 9 to indicate the time.
  • the mechanism 1 further comprises according to the invention a locking or clutch device 20 as explained below with reference to the various embodiments presented, which has the task of blocking at least one wheel of the set of wheels. in particular between each action of the electric motor 2 for the advance or the recoil including the needles indicating the time.
  • the electric motor 2 is fixed in a traditional manner on a not shown turntable, as well as an end of the axes of the wheels 3, 4, 5 and 6 of the set of gear wheels free rotation. The other end of the axes of the wheels 3, 4, 5 and 6 is kept free of rotation at least on a bridge fixed to the plate or through an opening of a dial of the watch.
  • This electric motor 2 is preferably a step motor of the Lavet type.
  • This electric motor 2 is essentially composed of a coil mounted on a magnetic circuit defining the stator, and a not shown rotor coaxially disposed on the axis of a first wheel 3 of the wheel assembly. gear.
  • the motor coil is connected to an electrical drive circuit of the motor, which can be part of a processor circuit clocked by a conventional quartz resonator oscillator stage.
  • the motor rotor is rotated in a clockwise or counterclockwise direction depending on the electric drive pulses provided by the drive electrical circuit. Between each electrical activation, the electric motor is in a so-called rest mode and must guarantee a determined positioning torque, in order to keep the needles 8, 9 for indicating the time of the watch without any shift.
  • the locking device 20 in order to lock at least one toothed wheel, for example the toothed wheel 7 between each activation of advance or recoil of the engine This allows, in case of shock of the watch, to hold the needles 8, 9 for the indication of the time without shifting.
  • the set of gear wheels may comprise, as shown, a first toothed wheel 3, the axis of which is connected to the rotor of the electric motor 2, for actuating a second toothed wheel 4 each time the electric motor 2 is activated.
  • the second toothed wheel 4 meshes with a third toothed wheel 6, which carries on its axis the minute hand 8.
  • a fourth toothed wheel 5 meshes with a complementary gear not shown on the axis of the third toothed wheel 6.
  • This fourth toothed wheel 5 comprises a second gear 5 'on its axis to act as a reduction gear, in order to drive a fifth toothed wheel 7 disposed coaxially on the axis of the third toothed wheel 6.
  • the axial tube of the fifth toothed wheel 7 carries the needle 9 hours.
  • the locking device 20 or clutch comprises in particular a piezoelectric element or actuator 21, which is fixed at one end to a first support 23 of the frame of the electromechanical watch, which can be directly attached to the watch plate, which supports the watch movement. Another end of the piezoelectric actuator 21 may also be fixedly or freely movable in a second support 23 'of the frame.
  • the piezoelectric actuator 21 may be a blade of generally rectangular shape and placed in a curved position to rest in the rest position directly against the toothed wheel 7 to keep it locked between two activations of the electric motor 2.
  • a latch 22 guided in an opening of a guide stud 24 fixed to the watch plate is pushed by the piezoelectric actuator 21 in the rest position between two teeth of the toothed wheel 7 to keep it locked between two activations of electric motor drive.
  • the locking device 20 allows, via the piezoelectric actuator 21 and for example the latch 22, to maintain one of the wheels of the set of gear wheels integral with the frame or the plate.
  • This locking of one of the toothed wheels 7 is performed between two activations of the electric motor 2, that is to say between two training steps to advance or retreat or the needles 8 and 9 of the indication of the 'hour.
  • the clutch or locking device 20 is released. It means that the actuator piezoelectric 21 is excited in its own ultrasonic mode or by a supply voltage to move it in a direction opposite to the locking of the wheel.
  • the supply voltage may come from the processor circuit not shown. This also makes it possible to move the latch 22 in the direction opposite to the locking position, in particular to release the toothed wheel 7 to enable the needles 8 and 9 to advance or retract.
  • the times to activate the piezoelectric actuator represent much less time than the rest times, which leads to reduced power consumption.
  • the electrical signals supplied to the motor coil may in part be used to activate the piezoelectric actuator 21, in order to release the toothed wheel 7 locked between two successive activations of the electric motor 2.
  • the piezoelectric actuator may be composed of titanium oxide or defined as a lead titanate-zirconate type (PZT) material. It can be realized by several layers deposited successively one on the other of this type of piezoelectric material, so as to have a thickness of between 0.1 to 1 mm for example.
  • PZT lead titanate-zirconate type
  • piezoelectric actuator 21 instead of the piezoelectric actuator 21, it can also be envisaged to use an electro-active polymer element or a shape memory alloy element.
  • This shape memory alloy element can heat up to the passage of a current and thus deform away from the wheel to release it.
  • FIGS. Figures 2a and 2b A first embodiment of the locking or clutch device is shown in FIGS. Figures 2a and 2b .
  • This first embodiment corresponds to that described above with reference to the figure 1 .
  • the locking device 20 thus comprises a piezoelectric element or actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch.
  • a second end of the piezoelectric actuator 21 can also be held stationary or free of movement in a second support 23 'of the frame.
  • the first and second supports 23, 23 ' can be directly fixed by gluing or welding, or screwed onto the watch plate, which supports the clockwork movement.
  • the piezoelectric actuator 21 may be a blade of generally rectangular shape and placed in a bent position at rest to radially push a latch 22 between two teeth of a wheel of the set of gear wheels, as shown in FIG. figure 2a .
  • the toothed wheel locked by the latch 22 may for example be the toothed wheel 7 bearing on its axial tube the hour hand, but it may also be another wheel of the set of gear wheels. .
  • the latch 22 is in the form of a cylindrical rod with a rounded end, which is housed between two teeth of the toothed wheel 7 for locking.
  • the diameter of this cylindrical rod is adapted to the average distance between two teeth of said toothed wheel 7 to ensure proper locking of the wheel 7.
  • the lock 22 in cylindrical form is guided in a through opening 25 made in a stud 24 fixed on the platen or the frame of the watch.
  • This opening 25 has a cylindrical shape and a diameter slightly greater than the diameter of the latch 22 to let it slide freely in said guide opening 25.
  • the other end of the latch 22 bears on a portion of the piezoelectric actuator 21, which may be a central portion of said actuator.
  • this other end of the latch 22 is glued or welded or screwed to the central portion of the piezoelectric actuator. On this figure 2a the latch 22 is thus pushed between the two teeth of the wheel 7 by the piezoelectric actuator 21, for example in the rest position.
  • the piezoelectric actuator 21 can be activated for example electrically by means of an electrical signal in the form of a supply voltage supplied to the two unrepresented electrodes of said actuator. With the electrical activation provided to the piezoelectric actuator 21, the actuator moves in a direction opposite to the blocking direction shown in FIG. figure 2a .
  • the latch 22 can also be pulled by the piezoelectric actuator 21 in a release position of the wheel 7. However, as the end of the latch 22 has a rounded shape, the teeth of the toothed wheel 7, which can be driven by rotation, can easily push said latch 22, when the piezoelectric actuator is electrically activated.
  • the latch 22 may also be of a different shape than a simple cylindrical rod.
  • Said latch 22 may be designed as a rod of rectangular or polygonal section, in order to slide in an opening 25 of the stud 24 of corresponding shape.
  • Said latch 22 may also have a curved shape as the opening 25 welcoming it, as far as it can easily occupy either a locking position of the wheel 7, or a release position of said wheel to allow it to rotate freely.
  • FIGS. Figures 3a and 3b A second embodiment of the locking or clutch device is shown in FIGS. Figures 3a and 3b .
  • This second embodiment comprises elements identical to those described with reference the figures 1 , 2a and 2b .
  • the locking device 20 comprises a piezoelectric element or actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch.
  • a second end of the piezoelectric actuator 21 can be held stationary or free of movement in a second support 23 'of the frame.
  • the first and second supports 23, 23 ' can be directly fixed by gluing or welding, or screwed onto the watch plate, which supports the clockwork movement.
  • the locking device 20 comprises a latch 22 that can be pushed by the piezoelectric actuator 21 into a hole 14 among several holes made in a toothed wheel of the set of gear wheels.
  • the number of holes 14 may correspond to the number of teeth of said wheel, and said holes are regularly spaced and arranged on a circle concentric with said wheel.
  • the latch 22 is preferably pushed axially by the piezoelectric actuator 21, which is a blade of generally rectangular shape and curved in a rest mode.
  • This tooth wheel may be for example the second toothed wheel 4, but another wheel can be used too.
  • the latch 22 can be made in the form of a cylindrical rod with a rounded end, which is housed by an axial movement in a hole 14 of the second wheel 4 for locking.
  • the diameter of this cylindrical rod is adapted to be slightly less than the diameter of each hole 14 of the second wheel 4.
  • the lock 22 in cylindrical form is guided in a through opening 25 made in a stud 24 fixed to the plate or the frame of the watch.
  • This opening 25 has a cylindrical shape and a diameter slightly greater than the diameter of the latch 22 to let it slide freely in said guide opening 25.
  • the other end of the latch 22 bears on a portion of the piezoelectric actuator 21, which may be a central portion of said actuator. It can be provided that this other end of the latch 22 is glued or welded or screwed to the central portion of the piezoelectric actuator.
  • the piezoelectric actuator 21 can be activated for example electrically by means of an electrical signal in the form of a supply voltage supplied to the two unrepresented electrodes of said actuator. With the electrical activation provided to the piezoelectric actuator 21, the actuator moves in a direction opposite to the blocking direction.
  • the displacement of the piezoelectric actuator 21 activated or not activated, and the latch 22 is symbolically represented by the arrows on the figure 3b .
  • the piezoelectric actuator 21 and the latch 22 are preferably represented on this figure 3b , when the actuator is electrically activated, while the position of the actuator 21 not activated and the latch 22 is represented by broken lines.
  • the latch 22 can also be pulled by the piezoelectric actuator 21 in a release position of the wheel 4.
  • the latch 22 remains engaged in a hole 14 of the toothed wheel 4 during the locking of said wheel. In the event of a radial impact, the latch 22 in one of the holes 14 ensures that the piezoelectric actuator 21 does not lock.
  • FIGS. Figures 4a and 4b A third embodiment of the locking or clutch device is shown in FIGS. Figures 4a and 4b .
  • the locking device 20 comprises only the piezoelectric actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch.
  • a second end of the piezoelectric actuator 21 can be held stationary or free of movement in a second support 23 'of the frame.
  • the piezoelectric actuator 21 is used alone to block a wheel of the set of gear wheels or to release said wheel to allow it to rotate under the action of the electric motor.
  • the piezoelectric actuator 21 comprises a through opening 26 preferably disposed in a central portion to allow the passage with a large clearance to the axis 4a of a toothed wheel 4 of the assembly of gear wheels. Both ends of the axis 4a of the wheel are mounted free of movement between a bridge and the watch plate, not shown on these Figures 4a and 4b .
  • the general shape of the piezoelectric actuator 21 corresponds in a manner similar to a generally rectangular shaped blade as shown in FIGS. figures 1 , 2a, 2b, 3a and 3b .
  • the piezoelectric actuator 21 is in a rest position of curved shape to come to apply with a certain force on a lower or upper surface 4b of the tooth wheel 4.
  • the piezoelectric actuator 21 is activated in particular by an electrical signal in the form of a supply voltage to force it to move away from the lower surface 4b of the tooth wheel 4 and thus release it from the blockage.
  • the toothed wheel 4 can freely rotate with each activation of the electric motor.
  • FIGS. Figures 5a and 5b A fourth embodiment of the locking or clutch device is shown in FIGS. Figures 5a and 5b .
  • the locking device 20 also comprises only the piezoelectric actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch. A second end of the piezoelectric actuator 21 can be held stationary or free of movement in a second support 23 'of the frame.
  • the piezoelectric actuator 21 is used alone to block a wheel of the set of gear wheels or to release said wheel to allow it to rotate with each activation of the electric motor.
  • the piezoelectric actuator 21 is in the form of a rectangular blade, which is arranged in abutment for example in a rest mode against the axial tube 7a of the fifth toothed wheel 7.
  • the The blade of the piezoelectric actuator 21 may be arranged to be non-curved while applying a locking force to said axial tube 7a.
  • the piezoelectric actuator 21 is activated by an electrical signal in the form of a supply voltage to impose move away from the axial tube 7a of the toothed wheel 7 and release it from the blockage.
  • the distance of the piezoelectric actuator 21 is symbolized by the arrow defining a force due to the electrical activation of the actuator.
  • the toothed wheel 7 can freely rotate with each activation of the electric motor.
  • the locking device 20 also comprises only the piezoelectric actuator 21, which is configured in the form of an elliptical tube, which is arranged around the axial tube 7a, and holds the axial tube 7a of the toothed wheel 7 tightly in place. a blockage in a rest mode as shown in the figure 6a . In this mode of rest, the two electrodes provided on the piezoelectric actuator 21 are not supplied with an electrical voltage by the terminals V + and V- of the electric wires 27 and 28.
  • the piezoelectric actuator 21 is electrically activated to occupy a locking position of one of the wheels in combination or not with a latch 22. In this case, case, when the piezoelectric actuator 21 is no longer electrically activated in a rest mode in combination or not with the latch 22, it releases the wheel, which can be rotated at each activation of the electric motor.
  • the piezoelectric actuator 21 can also be attached to a single support 23 at one end and free movement at its other end.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Electromechanical Clocks (AREA)

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention concerne un mécanisme d'entraînement d'une ou plusieurs aiguilles et/ou d'au moins un disque de quantième d'une montre électro-mécanique, qui est muni d'un dispositif de verrouillage ou d'embrayage. La montre électro-mécanique est à affichage de l'heure par des aiguilles, qui sont entraînées par une ou deux ou trois roues d'un ensemble de roues d'engrenage du mécanisme d'entraînement. Un moteur électrique permet d'entraîner l'ensemble de roues d'engrenage pour faire avancer ou reculer les aiguilles et/ou au moins un disque de quantième. Le dispositif de verrouillage ou d'embrayage est prévu pour bloquer momentanément une partie de l'ensemble de roues d'engrenage pour empêcher un décalage notamment des aiguilles en cas de choc de la montre, et tout en laissant libre l'avance des aiguilles pour l'affichage ou le réglage de l'heure.The present invention relates to a drive mechanism of one or more needles and / or at least one date disc of an electromechanical watch, which is provided with a locking or clutch device. The electro-mechanical watch is time-stamped by hands, which are driven by one or two or three wheels of a set of gear wheels of the drive mechanism. An electric motor drives the set of gear wheels to advance or retreat the needles and / or at least one date disc. The locking or clutching device is provided for momentarily blocking a part of the set of gear wheels to prevent a shift, in particular of the needles in the event of shock of the watch, and while leaving free the advance of the needles for displaying or setting the time.

ARRIERE-PLAN TECHNOLOGIQUEBACKGROUND

Dans une montre électro-mécanique, les aiguilles sont généralement entraînées par l'intermédiaire d'un ensemble ou train d'engrenages, qui peut être activé par un moteur électrique pas à pas du type Lavet. Dans ce cas, les aiguilles sont entraînées pas à pas par une ou deux roues du train d'engrenages au moyen de l'activation du moteur pas à pas. Un couple de positionnement important sur le moteur pas à pas peut permettre d'utiliser des aiguilles d'indication de l'heure ayant un grand balourd. Ces aiguilles peuvent être plus grosses ou plus lourdes. Lors d'un choc de la montre, le couple de positionnement du moteur électrique peut permettre de maintenir les aiguilles en position, mais un décalage desdites aiguilles d'indication de l'heure peut survenir, ce qui constitue un inconvénient d'une montre électro-mécanique de l'état de la technique.In an electromechanical watch, the needles are generally driven via a set or gear train, which can be activated by a Lavet type electric stepper motor. In this case, the needles are driven stepwise by one or two wheels of the gear train by means of activation of the stepper motor. A large positioning torque on the stepper motor may allow the use of time indicating hands having a large unbalance. These needles can be bigger or heavier. During a shock of the watch, the positioning torque of the electric motor can keep the needles in position, but an offset of said time indicating hands may occur, which is a disadvantage of an electro watch. -mechanical state of the art.

Il est encore à noter que si le couple de positionnement devient trop important, le moteur électrique ne peut plus tourner, ce qui constitue également un inconvénient. Il est nécessaire dans ce cas d'optimiser au maximum le moteur électrique, mais cela conduit inévitablement à augmenter également la consommation électrique pour l'entraînement des aiguilles à fort balourd. Ceci n'est pas souhaité lors d'une alimentation de la montre par une pile ou batterie.It should also be noted that if the positioning torque becomes too great, the electric motor can no longer rotate, which is also a disadvantage. In this case, it is necessary to optimize the electric motor as much as possible, but this inevitably leads to an increase in the electrical consumption for driving the high-unbalance hands. This is not desired when powering the watch by a battery or battery.

On peut citer la demande de brevet CH 699 771 A2 , qui décrit un mécanisme de blocage d'une roue dentée d'un module horloger. La roue dentée est entraînée par un cliquet actionné par un moteur électrique du type Lavet. Entre chaque activation du moteur, au moins un doigt guidé vient se loger entre deux dents de la roue dentée pour la bloquer. Le doigt est entraîné dans une position de blocage par un actionneur électrostatique. Cependant l'agencement de blocage de la roue dentée entre chaque activation du moteur électrique est relativement compliqué, ce qui constitue un inconvénient.One can quote the patent application CH 699 771 A2 which describes a locking mechanism of a gear wheel of a watch module. The toothed wheel is driven by a ratchet actuated by an electric motor of the Lavet type. Between each activation of the motor, at least one guided finger is housed between two teeth of the toothed wheel to block it. The finger is driven into a locking position by an electrostatic actuator. However, the locking arrangement of the toothed wheel between each activation of the electric motor is relatively complicated, which is a drawback.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

L'invention a donc pour but principal de pallier aux inconvénients susmentionnés en proposant une montre électro-mécanique à mécanisme d'entraînement d'aiguilles et/ou d'au moins un disque de quantième, qui est muni d'un dispositif de verrouillage permettant d'augmenter le balourd et l'inertie des aiguilles entraînées par un moteur avec une consommation électrique réduite.The main purpose of the invention is therefore to overcome the aforementioned drawbacks by proposing an electromechanical watch with a needle drive mechanism and / or at least one date disk, which is provided with a locking device enabling to increase the unbalance and the inertia of the needles driven by an engine with a reduced power consumption.

A cet effet, la présente invention concerne une montre électro-mécanique à mécanisme d'entraînement d'une ou plusieurs aiguilles et/ou d'au moins un disque de quantième d'une montre électro-mécanique, qui est muni d'un dispositif de verrouillage, qui comprend les caractéristiques des revendications indépendantes 1 et 2.For this purpose, the present invention relates to an electromechanical watch with a drive mechanism for one or more needles and / or at least one date disc of an electromechanical watch, which is provided with a device locking device, which comprises the features of the independent claims 1 and 2.

Des formes particulières d'exécution de la montre à mécanisme d'entraînement sont définies dans les revendications dépendantes 3 à 10.Particular embodiments of the drive mechanism watch are defined in dependent claims 3 to 10.

Un avantage du mécanisme d'entraînement selon l'invention réside dans le fait qu'il permet au moteur électrique d'avoir un couple de positionnement relativement faible uniquement pour définir la position de repos du rotor, mais plus pour retenir la ou les aiguilles à fort balourd en cas de choc de la montre. L'élément ou actionneur piézoélectrique permet directement ou en combinaison d'un verrou de bloquer une roue d'un ensemble de roues d'engrenages. L'ensemble de roues d'engrenage est entraîné par le moteur électrique, qui peut être un moteur pas à pas, afin de faire avancer ou reculer la ou les aiguilles notamment d'indication de l'heure. Le verrou maintenu par l'actionneur piézoélectrique permet de rendre solidaire une roue de l'ensemble de roues d'engrenage, d'un bâti ou platine de la montre entre chaque action d'entraînement du moteur électrique. En activant l'actionneur piézoélectrique par un signal électrique, le verrou peut être déplacé pour libérer ladite roue pour l'avance ou le recul d'une ou plusieurs aiguilles au moyen du moteur électrique. En lieu et place de l'actionneur piézoélectrique, il peut aussi être utilisé un élément à polymère électro-actif ou un élément en alliage à mémoire de forme, qui peut s'échauffer au passage d'un courant et ainsi se déformer.An advantage of the drive mechanism according to the invention lies in the fact that it allows the electric motor to have a relatively low positioning torque only to define the rest position of the rotor, but more to retain the needle or needles to strong unbalance in case of shock of the watch. The piezoelectric element or actuator allows directly or in combination with a lock to lock a wheel of a set of gear wheels. The set of gear wheels is driven by the electric motor, which may be a stepper motor, to advance or retreat the needle or needles including time indication. The latch held by the piezoelectric actuator makes it possible to make a wheel of the set of gear wheels, a frame or a platen of the watch integral between each driving action of the electric motor. By activating the piezoelectric actuator by an electrical signal, the latch can be moved to release said wheel for advance or retraction of one or more needles by means of the electric motor. Instead of the piezoelectric actuator, it can also be used an electroactive polymer element or a shape memory alloy element, which can heat up to the passage of a current and thus be deformed.

Un autre avantage d'utiliser un actionneur piézoélectrique pour bloquer au moins une roue d'un ensemble de roues d'engrenage entre chaque action du moteur électrique, est qu'il est possible d'avoir une consommation électrique inférieure ou égale par rapport à un mécanisme traditionnel. De meilleures performances notamment de maintien des aiguilles à fort balourd en cas de chocs mécaniques, peuvent être constatées par le blocage généré par l'actionneur piézoélectrique. L'actionneur piézoélectrique peut générer une force importante de blocage d'au moins une roue de l'ensemble de roues d'engrenage.Another advantage of using a piezoelectric actuator to lock at least one wheel of a set of gear wheels between each action of the electric motor, is that it is possible to have a power consumption less than or equal to traditional mechanism. Better performance, especially keeping needles with high unbalance in case of mechanical shocks, can be noticed by the blocking generated by the piezoelectric actuator. The piezoelectric actuator can generate a large blocking force of at least one wheel of the set of gear wheels.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

Les buts, avantages et caractéristiques du mécanisme d'entraînement d'aiguilles et/ou d'au moins un disque de quantième d'une montre électro-mécanique, qui est muni d'un dispositif de verrouillage, apparaîtront mieux dans la description suivante de manière non limitative en regard des dessins sur lesquels :

  • la figure 1 représente une vue tridimensionnelle simplifiée du mécanisme d'entraînement d'aiguilles d'une montre électro-mécanique, qui est muni d'un dispositif de verrouillage selon une première forme d'exécution selon l'invention,
  • les figures 2a et 2b représentent des vues de dessus d'au moins une roue du mécanisme avec le dispositif de verrouillage dans une position de blocage et dans une position de libération de la roue de la première forme d'exécution selon l'invention,
  • les figures 3a et 3b représentent des vues de dessus et de côté d'au moins une roue du mécanisme avec le dispositif de verrouillage pour bloquer et libérer la roue d'une seconde forme d'exécution selon l'invention,
  • les figures 4a et 4b représentent des vues de côté d'au moins une roue du mécanisme avec le dispositif de verrouillage dans une position de blocage et dans une position de libération de la roue d'une troisième forme d'exécution selon l'invention,
  • les figures 5a et 5b représentent des vues de dessus d'au moins une roue du mécanisme avec le dispositif de verrouillage dans une position de blocage et dans une position de libération de la roue d'une quatrième forme d'exécution selon l'invention, et
  • les figures 6a et 6b représentent des vues de dessus d'au moins une roue du mécanisme avec le dispositif de verrouillage dans une position de blocage et dans une position de libération de la roue d'une cinquième forme d'exécution selon l'invention.
The purposes, advantages and characteristics of the needle drive mechanism and / or at least one date disk of an electromechanical watch, which is provided with a locking device, will appear better in the following description of non-limiting way with regard to the drawings in which:
  • the figure 1 represents a simplified three-dimensional view of the electromechanical clockwise drive mechanism, which is provided with a locking device according to a first embodiment of the invention,
  • the Figures 2a and 2b represent top views of at least one wheel of the mechanism with the locking device in a locking position and in a release position of the wheel of the first embodiment according to the invention,
  • the Figures 3a and 3b represent top and side views of at least one wheel of the mechanism with the locking device for locking and releasing the wheel of a second embodiment according to the invention,
  • the Figures 4a and 4b show side views of at least one wheel of the mechanism with the locking device in a locking position and in a wheel release position of a third embodiment according to the invention,
  • the Figures 5a and 5b represent top views of at least one wheel of the mechanism with the locking device in a locking position and in a wheel release position of a fourth embodiment according to the invention, and
  • the Figures 6a and 6b represent top views of at least one mechanism wheel with the locking device in a locking position and in a wheel release position of a fifth embodiment according to the invention.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Dans la description suivante, tous les composants du mécanisme d'entraînement d'aiguilles et/ou d'au moins un disque de quantième, qui sont bien connus de l'homme du métier dans ce domaine technique ne sont relatés que de manière simplifiée. Le mécanisme d'entraînement d'aiguilles constitue essentiellement un mouvement d'horlogerie muni d'un moteur électrique, qui est contrôlé par un processeur cadencé par un circuit de base de temps. Le mécanisme est muni d'un dispositif de verrouillage ou d'embrayage susceptible de bloquer au moins une roue du mécanisme entre deux activations d'avance ou de recul des aiguilles, qui sont générées par le moteur électrique.In the following description, all the components of the needle drive mechanism and / or at least one date disk, which are well known to those skilled in this technical field are only reported in a simplified manner. The needle drive mechanism is essentially a timepiece movement provided with an electric motor, which is controlled by a processor clocked by a time base circuit. The mechanism is provided with a locking or clutch device capable of locking at least one wheel of the mechanism between two actuations of advance or recoil of the needles, which are generated by the electric motor.

La figure 1 représente schématiquement les différents éléments, qui composent le mécanisme 1 d'entraînement d'une ou plusieurs aiguilles 8, 9 et/ou d'au moins un disque de quantième non représenté, d'une montre électro-mécanique. Les différents éléments décrits ci-après sont illustrés sans respecter forcément leurs dimensions réelles par simplification et clarté de description.The figure 1 schematically represents the various elements, which make up the mechanism 1 for driving one or more needles 8, 9 and / or at least one date disk not shown, an electromechanical watch. The various elements described below are illustrated without necessarily respecting their actual dimensions for simplification and clarity of description.

Le mécanisme 1 comprend tout d'abord un moteur électrique 2 et un ensemble de roues d'engrenage 3, 4, 5, 6 et 7, qui est disposé entre le moteur électrique et au moins des aiguilles 8, 9 notamment pour faire avancer ou reculer la ou les aiguilles 8, 9 d'indication de l'heure. Le mécanisme 1 comprend encore selon l'invention un dispositif de verrouillage ou d'embrayage 20 comme expliqué ci-après en référence aux différentes formes d'exécution présentées, qui a pour tâche de bloquer au moins une roue de l'ensemble de roues d'engrenage en particulier entre chaque action du moteur électrique 2 pour l'avance ou le recul notamment des aiguilles d'indication de l'heure.The mechanism 1 comprises firstly an electric motor 2 and a set of gear wheels 3, 4, 5, 6 and 7, which is arranged between the electric motor and at least needles 8, 9 especially to advance or move the hands 8, 9 to indicate the time. The mechanism 1 further comprises according to the invention a locking or clutch device 20 as explained below with reference to the various embodiments presented, which has the task of blocking at least one wheel of the set of wheels. in particular between each action of the electric motor 2 for the advance or the recoil including the needles indicating the time.

Le moteur électrique 2 est fixé de manière traditionnelle sur une platine de montre non représentée, ainsi qu'une extrémité des axes des roues 3, 4, 5 et 6 de l'ensemble des roues d'engrenage libre de rotation. L'autre extrémité des axes des roues 3, 4, 5 et 6 est maintenue libre de rotation au moins sur un pont fixé à la platine ou à travers une ouverture d'un cadran de la montre. Ce moteur électrique 2 est de préférence un moteur pas à pas du type Lavet. Ce moteur électrique 2 est composé pour l'essentiel d'une bobine montée sur un circuit magnétique définissant le stator, et un rotor non représenté disposé de manière coaxiale sur l'axe d'une première roue 3 de l'ensemble de roues d'engrenage.The electric motor 2 is fixed in a traditional manner on a not shown turntable, as well as an end of the axes of the wheels 3, 4, 5 and 6 of the set of gear wheels free rotation. The other end of the axes of the wheels 3, 4, 5 and 6 is kept free of rotation at least on a bridge fixed to the plate or through an opening of a dial of the watch. This electric motor 2 is preferably a step motor of the Lavet type. This electric motor 2 is essentially composed of a coil mounted on a magnetic circuit defining the stator, and a not shown rotor coaxially disposed on the axis of a first wheel 3 of the wheel assembly. gear.

Sans être représenté sur la figure 1, la bobine du moteur est reliée à un circuit électrique d'entraînement du moteur, qui peut faire partie d'un circuit processeur cadencé par un étage oscillateur à résonateur à quartz traditionnel. Le rotor du moteur est entraîné en rotation dans une direction horaire ou dans une direction anti-horaire en fonction des impulsions d'entraînement électriques fournies par le circuit électrique d'entraînement. Entre chaque activation électrique, le moteur électrique est dans un mode dit de repos et doit garantir un couple de positionnement déterminé, afin de maintenir sans décalage les aiguilles 8, 9 d'indication de l'heure de la montre. Si les aiguilles 8 et 9 sont conçues avec un grand balourd, il est prévu le dispositif de verrouillage 20, afin de bloquer au moins une roue à dents, par exemple la roue à dents 7 entre chaque activation d'avance ou de recul du moteur électrique pas à pas 2. Ceci permet en cas de choc de la montre de maintenir sans décalage les aiguilles 8, 9 pour l'indication de l'heure.Without being represented on the figure 1 , the motor coil is connected to an electrical drive circuit of the motor, which can be part of a processor circuit clocked by a conventional quartz resonator oscillator stage. The motor rotor is rotated in a clockwise or counterclockwise direction depending on the electric drive pulses provided by the drive electrical circuit. Between each electrical activation, the electric motor is in a so-called rest mode and must guarantee a determined positioning torque, in order to keep the needles 8, 9 for indicating the time of the watch without any shift. If the needles 8 and 9 are designed with great unbalance, it is provided the locking device 20, in order to lock at least one toothed wheel, for example the toothed wheel 7 between each activation of advance or recoil of the engine This allows, in case of shock of the watch, to hold the needles 8, 9 for the indication of the time without shifting.

L'ensemble de roues d'engrenage peut comprendre, comme représenté, une première roue à dents 3, dont l'axe est relié au rotor du moteur électrique 2, pour actionner une seconde roue à dents 4 à chaque activation du moteur électrique 2. La seconde roue à dents 4 engrène avec une troisième roue à dents 6, qui porte sur son axe l'aiguille 8 des minutes. Une quatrième roue à dents 5 engrène avec un engrenage complémentaire non représenté sur l'axe de la troisième roue à dents 6. Cette quatrième roue à dents 5 comprend un second engrenage 5' sur son axe pour servir de démultiplicateur, afin d'entraîner une cinquième roue à dents 7 disposée coaxialement sur l'axe de la troisième roue à dents 6. Le tube axial de la cinquième roue à dents 7 porte l'aiguille 9 des heures.The set of gear wheels may comprise, as shown, a first toothed wheel 3, the axis of which is connected to the rotor of the electric motor 2, for actuating a second toothed wheel 4 each time the electric motor 2 is activated. The second toothed wheel 4 meshes with a third toothed wheel 6, which carries on its axis the minute hand 8. A fourth toothed wheel 5 meshes with a complementary gear not shown on the axis of the third toothed wheel 6. This fourth toothed wheel 5 comprises a second gear 5 'on its axis to act as a reduction gear, in order to drive a fifth toothed wheel 7 disposed coaxially on the axis of the third toothed wheel 6. The axial tube of the fifth toothed wheel 7 carries the needle 9 hours.

Le dispositif de verrouillage 20 ou d'embrayage comprend en particulier un élément ou actionneur piézoélectrique 21, qui est fixé à une extrémité à un premier support 23 du bâti de la montre électro-mécanique, qui peut être directement fixé sur la platine de montre, qui supporte le mouvement d'horlogerie. Une autre extrémité de l'actionneur piézoélectrique 21 peut également être maintenue fixement ou libre de mouvement dans un second support 23' du bâti. L'actionneur piézoélectrique 21 peut être une lame de forme générale rectangulaire et placée dans une position courbée pour venir s'appuyer en position de repos directement contre la roue à dents 7 pour la maintenir bloquée entre deux activations du moteur électrique 2. De préférence, un verrou 22 guidé dans une ouverture d'un plot 24 de guidage fixé sur la platine de montre est poussé par l'actionneur piézoélectrique 21 en position de repos entre deux dents de la roue à dents 7 pour la maintenir bloquée entre deux activations d'entraînement du moteur électrique.The locking device 20 or clutch comprises in particular a piezoelectric element or actuator 21, which is fixed at one end to a first support 23 of the frame of the electromechanical watch, which can be directly attached to the watch plate, which supports the watch movement. Another end of the piezoelectric actuator 21 may also be fixedly or freely movable in a second support 23 'of the frame. The piezoelectric actuator 21 may be a blade of generally rectangular shape and placed in a curved position to rest in the rest position directly against the toothed wheel 7 to keep it locked between two activations of the electric motor 2. Preferably, a latch 22 guided in an opening of a guide stud 24 fixed to the watch plate is pushed by the piezoelectric actuator 21 in the rest position between two teeth of the toothed wheel 7 to keep it locked between two activations of electric motor drive.

Le dispositif de verrouillage 20 permet par l'intermédiaire de l'actionneur piézoélectrique 21 et par exemple du verrou 22 de maintenir solidaire du bâti ou de la platine une des roues à dent de l'ensemble de roues d'engrenage. Ce blocage d'une des roues à dents 7 est effectué entre deux activations du moteur électrique 2, c'est-à-dire entre deux pas d'entraînement pour faire avancer ou reculer la ou les aiguilles 8 et 9 d'indication de l'heure. Par contre à chaque activation du moteur pour l'avance ou le recul de la ou des aiguilles 8 et 9, le dispositif d'embrayage ou de verrouillage 20 est relâché. Cela signifie que l'actionneur piézoélectrique 21 est excité à son mode propre ultrasonique ou par une tension d'alimentation pour le déplacer dans une direction opposée au blocage de la roue. La tension d'alimentation peut provenir du circuit processeur non représenté. Cela permet également de déplacer le verrou 22 dans la direction opposée à la position de blocage, afin de libérer notamment la roue à dents 7 pour permettre l'avance ou le recul des aiguilles 8 et 9.The locking device 20 allows, via the piezoelectric actuator 21 and for example the latch 22, to maintain one of the wheels of the set of gear wheels integral with the frame or the plate. This locking of one of the toothed wheels 7 is performed between two activations of the electric motor 2, that is to say between two training steps to advance or retreat or the needles 8 and 9 of the indication of the 'hour. By against each activation of the motor for the advance or the retreat of the needle or needles 8 and 9, the clutch or locking device 20 is released. It means that the actuator piezoelectric 21 is excited in its own ultrasonic mode or by a supply voltage to move it in a direction opposite to the locking of the wheel. The supply voltage may come from the processor circuit not shown. This also makes it possible to move the latch 22 in the direction opposite to the locking position, in particular to release the toothed wheel 7 to enable the needles 8 and 9 to advance or retract.

Comme le moteur électrique du type Lavet a toujours un couple de positionnement assez faible, ce couple permet juste de définir une position de repos du rotor, mais ne permet normalement pas de retenir la ou les aiguilles en cas de choc de la montre. Ainsi grâce à l'actionneur piézoélectrique 21 et au verrou 22 poussé radialement par ledit actionneur dans un mode de repos contre une des roues de l'ensemble de roues d'engrenage, cela garantit le maintien de l'indication horaire des aiguilles entre chaque activation du moteur électrique indépendamment de tout choc subi par la montre. En cas de choc, le couple de rotation est transmis directement au verrou 22 et non pas directement à l'actionneur piézoélectrique 21. De tels chocs peuvent être de valeur égale à 500 G ou 5000 G, ce qui ne permet pas au seul moteur électrique 2 et à son couple de positionnement de maintenir les aiguilles dans une bonne indication de l'heure.As the electric motor of the Lavet type always has a relatively low positioning torque, this torque just defines a rest position of the rotor, but normally does not hold the needle or hands in case of shock of the watch. Thus, thanks to the piezoelectric actuator 21 and the latch 22 pushed radially by said actuator in a rest mode against one of the wheels of the set of gear wheels, this ensures the maintenance of the hourly indication of the needles between each activation. of the electric motor regardless of any shock suffered by the watch. In case of shock, the torque is transmitted directly to the latch 22 and not directly to the piezoelectric actuator 21. Such shocks may be equal to 500 G or 5000 G, which does not allow the only electric motor 2 and its positioning torque to keep the hands in a good indication of the time.

Les temps pour activer l'actionneur piézoélectrique représentent beaucoup moins de temps que les temps de repos, ce qui conduit à une consommation électrique réduite. Les signaux électriques fournis à la bobine du moteur peuvent en partie être utilisés pour activer l'actionneur piézoélectrique 21, afin de libérer la roue à dents 7 bloquée entre deux activations successives du moteur électrique 2.The times to activate the piezoelectric actuator represent much less time than the rest times, which leads to reduced power consumption. The electrical signals supplied to the motor coil may in part be used to activate the piezoelectric actuator 21, in order to release the toothed wheel 7 locked between two successive activations of the electric motor 2.

L'actionneur piézoélectrique peut être composé d'oxyde de titane ou défini comme un matériau du type à titanate-zirconate de plomb (PZT). Il peut être réalisé par plusieurs couches déposées successivement l'une sur l'autre de ce type de matériau piézoélectrique, afin d'avoir une épaisseur comprise entre 0.1 à 1 mm par exemple.The piezoelectric actuator may be composed of titanium oxide or defined as a lead titanate-zirconate type (PZT) material. It can be realized by several layers deposited successively one on the other of this type of piezoelectric material, so as to have a thickness of between 0.1 to 1 mm for example.

Il est à noter qu'en lieu et place de l'actionneur piézoélectrique 21, il peut aussi être envisagé d'utiliser un élément à polymère électro-actif ou un élément en alliage à mémoire de forme. Cet élément en alliage à mémoire de forme peut s'échauffer au passage d'un courant et ainsi se déformer en s'éloignant de la roue pour la libérer.It should be noted that instead of the piezoelectric actuator 21, it can also be envisaged to use an electro-active polymer element or a shape memory alloy element. This shape memory alloy element can heat up to the passage of a current and thus deform away from the wheel to release it.

Une première forme d'exécution du dispositif de verrouillage ou d'embrayage est représentée aux figures 2a et 2b. Cette première forme d'exécution correspond à celle décrite ci-devant en référence à la figure 1. Le dispositif de verrouillage 20 comprend donc un élément ou actionneur piézoélectrique 21, qui est fixé à une première extrémité à un premier support 23 du bâti de la montre électro-mécanique. Une seconde extrémité de l'actionneur piézoélectrique 21 peut aussi être maintenue fixement ou libre de mouvement dans un second support 23' du bâti. Les premier et second supports 23, 23' peuvent être directement fixés par collage ou soudage, ou vissés sur la platine de montre, qui supporte le mouvement d'horlogerie.A first embodiment of the locking or clutch device is shown in FIGS. Figures 2a and 2b . This first embodiment corresponds to that described above with reference to the figure 1 . The locking device 20 thus comprises a piezoelectric element or actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch. A second end of the piezoelectric actuator 21 can also be held stationary or free of movement in a second support 23 'of the frame. The first and second supports 23, 23 'can be directly fixed by gluing or welding, or screwed onto the watch plate, which supports the clockwork movement.

L'actionneur piézoélectrique 21 peut être une lame de forme générale rectangulaire et placée dans une position courbée au repos pour pousser radialement un verrou 22 entre deux dents d'une roue de l'ensemble de roues d'engrenage, comme montré à la figure 2a. La roue à dents bloquée par le verrou 22 peut être par exemple la roue à dents 7 portant sur son tube axial l'aiguille des heures, mais il peut s'agir également d'une autre roue de l'ensemble de roues d'engrenage.The piezoelectric actuator 21 may be a blade of generally rectangular shape and placed in a bent position at rest to radially push a latch 22 between two teeth of a wheel of the set of gear wheels, as shown in FIG. figure 2a . The toothed wheel locked by the latch 22 may for example be the toothed wheel 7 bearing on its axial tube the hour hand, but it may also be another wheel of the set of gear wheels. .

Le verrou 22 est sous forme d'une tige cylindrique avec une extrémité arrondie, qui vient se loger entre deux dents de la roue à dents 7 pour son blocage. Le diamètre de cette tige cylindrique est adapté à l'écart moyen entre deux dents de ladite roue à dents 7 pour assurer un bon blocage de cette roue 7. Le verrou 22 sous forme cylindrique est guidé dans une ouverture traversante 25 réalisée dans un plot 24 fixé sur la platine ou le bâti de la montre. Cette ouverture 25 est de forme cylindrique et de diamètre légèrement supérieur au diamètre du verrou 22 pour le laisser coulisser librement dans ladite ouverture de guidage 25. L'autre extrémité du verrou 22 est en appui sur une portion de l'actionneur piézoélectrique 21, qui peut être une portion centrale dudit actionneur. Il peut être prévu que cette autre extrémité du verrou 22 soit collée ou soudée ou vissée sur la portion centrale de l'actionneur piézoélectrique. Sur cette figure 2a, le verrou 22 est donc poussé entre les deux dents de la roue 7 par l'actionneur piézoélectrique 21 par exemple en position de repos.The latch 22 is in the form of a cylindrical rod with a rounded end, which is housed between two teeth of the toothed wheel 7 for locking. The diameter of this cylindrical rod is adapted to the average distance between two teeth of said toothed wheel 7 to ensure proper locking of the wheel 7. The lock 22 in cylindrical form is guided in a through opening 25 made in a stud 24 fixed on the platen or the frame of the watch. This opening 25 has a cylindrical shape and a diameter slightly greater than the diameter of the latch 22 to let it slide freely in said guide opening 25. The other end of the latch 22 bears on a portion of the piezoelectric actuator 21, which may be a central portion of said actuator. It may be provided that this other end of the latch 22 is glued or welded or screwed to the central portion of the piezoelectric actuator. On this figure 2a the latch 22 is thus pushed between the two teeth of the wheel 7 by the piezoelectric actuator 21, for example in the rest position.

Sur la figure 2b, l'actionneur piézoélectrique 21 peut être activé par exemple électriquement au moyen d'un signal électrique sous forme d'une tension d'alimentation fournie aux deux électrodes non représentées dudit actionneur. Avec l'activation électrique fournie à l'actionneur piézoélectrique 21, l'actionneur se déplace dans une direction opposée à la direction de blocage représentée à la figure 2a. Le verrou 22 peut être également tiré par l'actionneur piézoélectrique 21 dans une position de libération de la roue 7. Cependant comme l'extrémité du verrou 22 a une forme arrondie, les dents de la roue à dents 7, qui peut être entraînée en rotation, peut facilement repousser ledit verrou 22, quand l'actionneur piézoélectrique est électriquement activé.On the figure 2b , the piezoelectric actuator 21 can be activated for example electrically by means of an electrical signal in the form of a supply voltage supplied to the two unrepresented electrodes of said actuator. With the electrical activation provided to the piezoelectric actuator 21, the actuator moves in a direction opposite to the blocking direction shown in FIG. figure 2a . The latch 22 can also be pulled by the piezoelectric actuator 21 in a release position of the wheel 7. However, as the end of the latch 22 has a rounded shape, the teeth of the toothed wheel 7, which can be driven by rotation, can easily push said latch 22, when the piezoelectric actuator is electrically activated.

Il est encore à noter que le verrou 22 peut être également d'une forme différente d'une simple tige cylindrique. Ledit verrou 22 peut être conçu comme une tige de section rectangulaire ou polygonale, afin de pouvoir coulisser dans une ouverture 25 du plot 24 de forme correspondante. Ledit verrou 22 peut également avoir une forme courbée tout comme l'ouverture 25 l'accueillant, pour autant qu'il puisse occuper facilement soit une position de blocage de la roue 7, soit une position de libération de ladite roue pour lui permettre de tourner librement.It should also be noted that the latch 22 may also be of a different shape than a simple cylindrical rod. Said latch 22 may be designed as a rod of rectangular or polygonal section, in order to slide in an opening 25 of the stud 24 of corresponding shape. Said latch 22 may also have a curved shape as the opening 25 welcoming it, as far as it can easily occupy either a locking position of the wheel 7, or a release position of said wheel to allow it to rotate freely.

Une seconde forme d'exécution du dispositif de verrouillage ou d'embrayage est représentée aux figures 3a et 3b. Cette seconde forme d'exécution comprend des éléments identiques à ceux décrits en référence aux figures 1, 2a et 2b. Le dispositif de verrouillage 20 comprend un élément ou actionneur piézoélectrique 21, qui est fixé à une première extrémité à un premier support 23 du bâti de la montre électro-mécanique. Une seconde extrémité de l'actionneur piézoélectrique 21 peut être maintenue fixement ou libre de mouvement dans un second support 23' du bâti. Les premier et second supports 23, 23' peuvent être directement fixés par collage ou soudage, ou vissés sur la platine de montre, qui supporte le mouvement d'horlogerie.A second embodiment of the locking or clutch device is shown in FIGS. Figures 3a and 3b . This second embodiment comprises elements identical to those described with reference the figures 1 , 2a and 2b . The locking device 20 comprises a piezoelectric element or actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch. A second end of the piezoelectric actuator 21 can be held stationary or free of movement in a second support 23 'of the frame. The first and second supports 23, 23 'can be directly fixed by gluing or welding, or screwed onto the watch plate, which supports the clockwork movement.

Dans cette seconde forme d'exécution, le dispositif de verrouillage 20 comprend un verrou 22 susceptible d'être poussé par l'actionneur piézoélectrique 21 dans un trou 14 parmi plusieurs trous réalisés dans une roue à dents de l'ensemble de roues d'engrenage. Le nombre de trous 14 peut correspondre au nombre de dents de ladite roue, et lesdits trous sont régulièrement espacés et agencés sur un cercle concentrique à ladite roue. Le verrou 22 est de préférence poussé axialement par l'actionneur piézoélectrique 21, qui est une lame de forme générale rectangulaire et courbée dans un mode de repos. Cette roue à dents peut être à titre d'exemple la seconde roue à dents 4, mais une autre roue peut être utilisée aussi.In this second embodiment, the locking device 20 comprises a latch 22 that can be pushed by the piezoelectric actuator 21 into a hole 14 among several holes made in a toothed wheel of the set of gear wheels. . The number of holes 14 may correspond to the number of teeth of said wheel, and said holes are regularly spaced and arranged on a circle concentric with said wheel. The latch 22 is preferably pushed axially by the piezoelectric actuator 21, which is a blade of generally rectangular shape and curved in a rest mode. This tooth wheel may be for example the second toothed wheel 4, but another wheel can be used too.

Le verrou 22 peut être réalisé sous la forme d'une tige cylindrique avec une extrémité arrondie, qui vient se loger par un mouvement axial dans un trou 14 de la seconde roue 4 pour son blocage. Le diamètre de cette tige cylindrique est adapté pour être légèrement inférieur au diamètre de chaque trou 14 de la seconde roue 4. Le verrou 22 sous forme cylindrique est guidé dans une ouverture traversante 25 réalisée dans un plot 24 fixé sur la platine ou le bâti de la montre. Cette ouverture 25 est de forme cylindrique et de diamètre légèrement supérieur au diamètre du verrou 22 pour le laisser coulisser librement dans ladite ouverture de guidage 25. L'autre extrémité du verrou 22 est en appui sur une portion de l'actionneur piézoélectrique 21, qui peut être une portion centrale dudit actionneur. Il peut être prévu que cette autre extrémité du verrou 22 soit collée ou soudée ou vissée sur la portion centrale de l'actionneur piézoélectrique.The latch 22 can be made in the form of a cylindrical rod with a rounded end, which is housed by an axial movement in a hole 14 of the second wheel 4 for locking. The diameter of this cylindrical rod is adapted to be slightly less than the diameter of each hole 14 of the second wheel 4. The lock 22 in cylindrical form is guided in a through opening 25 made in a stud 24 fixed to the plate or the frame of the watch. This opening 25 has a cylindrical shape and a diameter slightly greater than the diameter of the latch 22 to let it slide freely in said guide opening 25. The other end of the latch 22 bears on a portion of the piezoelectric actuator 21, which may be a central portion of said actuator. It can be provided that this other end of the latch 22 is glued or welded or screwed to the central portion of the piezoelectric actuator.

Sur la figure 3b, l'actionneur piézoélectrique 21 peut être activé par exemple électriquement au moyen d'un signal électrique sous forme d'une tension d'alimentation fournie aux deux électrodes non représentées dudit actionneur. Avec l'activation électrique fournie à l'actionneur piézoélectrique 21, l'actionneur se déplace dans une direction opposée à la direction de blocage. Le déplacement de l'actionneur piézoélectrique 21 activé ou non activé, et du verrou 22 est symboliquement représenté par les flèches sur la figure 3b. L'actionneur piézoélectrique 21 et le verrou 22 sont de préférence représentés sur cette figure 3b, quand l'actionneur est électriquement activé, alors que la position de l'actionneur 21 non activé et du verrou 22 est représentée par des traits interrompus. Le verrou 22 peut être également tiré par l'actionneur piézoélectrique 21 dans une position de libération de la roue 4.On the figure 3b , the piezoelectric actuator 21 can be activated for example electrically by means of an electrical signal in the form of a supply voltage supplied to the two unrepresented electrodes of said actuator. With the electrical activation provided to the piezoelectric actuator 21, the actuator moves in a direction opposite to the blocking direction. The displacement of the piezoelectric actuator 21 activated or not activated, and the latch 22 is symbolically represented by the arrows on the figure 3b . The piezoelectric actuator 21 and the latch 22 are preferably represented on this figure 3b , when the actuator is electrically activated, while the position of the actuator 21 not activated and the latch 22 is represented by broken lines. The latch 22 can also be pulled by the piezoelectric actuator 21 in a release position of the wheel 4.

Il est encore à noter qu'avec cette seconde forme d'exécution, le verrou 22 reste engagé dans un trou 14 de la roue à dents 4 lors du blocage de ladite roue. En cas de choc radial, le verrou 22 dans un des trous 14 assure le blocage sans incidences sur l'actionneur piézoélectrique 21.It is also noted that with this second embodiment, the latch 22 remains engaged in a hole 14 of the toothed wheel 4 during the locking of said wheel. In the event of a radial impact, the latch 22 in one of the holes 14 ensures that the piezoelectric actuator 21 does not lock.

Une troisième forme d'exécution du dispositif de verrouillage ou d'embrayage est représentée aux figures 4a et 4b. Le dispositif de verrouillage 20 ne comprend que l'actionneur piézoélectrique 21, qui est fixé à une première extrémité à un premier support 23 du bâti de la montre électro-mécanique. Une seconde extrémité de l'actionneur piézoélectrique 21 peut être maintenue fixement ou libre de mouvement dans un second support 23' du bâti. L'actionneur piézoélectrique 21 est utilisé seul pour venir bloquer une roue de l'ensemble de roues d'engrenage ou pour libérer ladite roue pour lui permettre de tourner sous l'action du moteur électrique.A third embodiment of the locking or clutch device is shown in FIGS. Figures 4a and 4b . The locking device 20 comprises only the piezoelectric actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch. A second end of the piezoelectric actuator 21 can be held stationary or free of movement in a second support 23 'of the frame. The piezoelectric actuator 21 is used alone to block a wheel of the set of gear wheels or to release said wheel to allow it to rotate under the action of the electric motor.

L'actionneur piézoélectrique 21 comprend une ouverture traversante 26 disposée de préférence dans une portion centrale pour laisser le passage avec un grand jeu à l'axe 4a d'une roue à dents 4 de l'ensemble de roues d'engrenage. Les deux extrémités de l'axe 4a de la roue sont montées libres de mouvement entre un pont et la platine de montre, non représentés sur ces figures 4a et 4b. La forme générale de l'actionneur piézoélectrique 21 correspond de manière similaire à une lame de forme générale rectangulaire comme présentée aux figures 1, 2a, 2b, 3a et 3b.The piezoelectric actuator 21 comprises a through opening 26 preferably disposed in a central portion to allow the passage with a large clearance to the axis 4a of a toothed wheel 4 of the assembly of gear wheels. Both ends of the axis 4a of the wheel are mounted free of movement between a bridge and the watch plate, not shown on these Figures 4a and 4b . The general shape of the piezoelectric actuator 21 corresponds in a manner similar to a generally rectangular shaped blade as shown in FIGS. figures 1 , 2a, 2b, 3a and 3b .

A la figure 4a, l'actionneur piézoélectrique 21 est dans une position de repos de forme courbée pour venir s'appliquer avec une certaine force sur une surface inférieure ou supérieure 4b de la roue à dents 4. Par contre à la figure 4b, l'actionneur piézoélectrique 21 est activé notamment par un signal électrique sous la forme d'une tension d'alimentation pour lui imposer de s'éloigner de la surface inférieure 4b de la roue à dents 4 et ainsi la libérer du blocage. Dans cette configuration, la roue à dents 4 peut librement tourner à chaque activation du moteur électrique.To the figure 4a , the piezoelectric actuator 21 is in a rest position of curved shape to come to apply with a certain force on a lower or upper surface 4b of the tooth wheel 4. On the other hand, figure 4b , the piezoelectric actuator 21 is activated in particular by an electrical signal in the form of a supply voltage to force it to move away from the lower surface 4b of the tooth wheel 4 and thus release it from the blockage. In this configuration, the toothed wheel 4 can freely rotate with each activation of the electric motor.

Une quatrième forme d'exécution du dispositif de verrouillage ou d'embrayage est représentée aux figures 5a et 5b. Le dispositif de verrouillage 20 ne comprend également que l'actionneur piézoélectrique 21, qui est fixé à une première extrémité à un premier support 23 du bâti de la montre électro-mécanique. Une seconde extrémité de l'actionneur piézoélectrique 21 peut être maintenue fixement ou libre de mouvement dans un second support 23' du bâti. L'actionneur piézoélectrique 21 est utilisé seul pour venir bloquer une roue de l'ensemble de roues d'engrenage ou pour libérer ladite roue pour lui permettre de tourner à chaque activation du moteur électrique.A fourth embodiment of the locking or clutch device is shown in FIGS. Figures 5a and 5b . The locking device 20 also comprises only the piezoelectric actuator 21, which is fixed at a first end to a first support 23 of the frame of the electromechanical watch. A second end of the piezoelectric actuator 21 can be held stationary or free of movement in a second support 23 'of the frame. The piezoelectric actuator 21 is used alone to block a wheel of the set of gear wheels or to release said wheel to allow it to rotate with each activation of the electric motor.

Dans cette quatrième forme d'exécution à la figure 5a, l'actionneur piézoélectrique 21 est sous forme d'une lame rectangulaire, qui est disposée en appui par exemple dans un mode de repos contre le tube axial 7a de la cinquième roue à dents 7. Lors de son appui contre le tube axial, la lame de l'actionneur piézoélectrique 21 peut être agencée pour être non courbée tout en appliquant une force de blocage audit tube axial 7a. Par contre à la figure 5b, l'actionneur piézoélectrique 21 est activé par un signal électrique sous la forme d'une tension d'alimentation pour lui imposer de s'éloigner du tube axial 7a de la roue à dents 7 et ainsi la libérer du blocage. L'éloignement de l'actionneur piézoélectrique 21 est symbolisé par la flèche définissant une force due à l'activation électrique de l'actionneur. Dans cette configuration, la roue à dents 7 peut librement tourner à chaque activation du moteur électrique.In this fourth form of execution at figure 5a , the piezoelectric actuator 21 is in the form of a rectangular blade, which is arranged in abutment for example in a rest mode against the axial tube 7a of the fifth toothed wheel 7. When it bears against the axial tube, the The blade of the piezoelectric actuator 21 may be arranged to be non-curved while applying a locking force to said axial tube 7a. On the other hand, figure 5b , the piezoelectric actuator 21 is activated by an electrical signal in the form of a supply voltage to impose move away from the axial tube 7a of the toothed wheel 7 and release it from the blockage. The distance of the piezoelectric actuator 21 is symbolized by the arrow defining a force due to the electrical activation of the actuator. In this configuration, the toothed wheel 7 can freely rotate with each activation of the electric motor.

Finalement une cinquième forme d'exécution du dispositif de verrouillage ou d'embrayage est représentée aux figures 6a et 6b. Le dispositif de verrouillage 20 ne comprend également que l'actionneur piézoélectrique 21, qui est configuré sous la forme d'un tube elliptique, qui est disposé autour du tube axiale 7a, et maintient serré le tube axial 7a de la roue à dents 7 pour un blocage dans un mode de repos comme montré à la figure 6a. Dans ce mode de repos, les deux électrodes prévues sur l'actionneur piézoélectrique 21 ne sont pas alimentées par une tension électrique par les bornes V+ et V- des fils électriques 27 et 28. Par contre quand une tension électrique est fournie par les bornes V+ et V- aux deux électrodes de l'actionneur piézoélectrique, ledit actionneur prend la forme d'un tube circulaire comme montré à la figure 6b. Ainsi la roue à dents 7 est libérée et peut librement tourner à chaque activation du moteur électrique.Finally a fifth embodiment of the locking or clutch device is shown in FIGS. Figures 6a and 6b . The locking device 20 also comprises only the piezoelectric actuator 21, which is configured in the form of an elliptical tube, which is arranged around the axial tube 7a, and holds the axial tube 7a of the toothed wheel 7 tightly in place. a blockage in a rest mode as shown in the figure 6a . In this mode of rest, the two electrodes provided on the piezoelectric actuator 21 are not supplied with an electrical voltage by the terminals V + and V- of the electric wires 27 and 28. On the other hand, when a voltage is supplied by the terminals V + and V- to the two electrodes of the piezoelectric actuator, said actuator takes the form of a circular tube as shown in FIG. figure 6b . Thus the toothed wheel 7 is released and can freely rotate with each activation of the electric motor.

Avec une telle forme d'exécution présentée aux figures 6a et 6b, cela ne nécessite pas de synchronisation entre la roue à dents et un verrou prévu pour la bloquer. Ladite roue à dents peut être bloquée dans n'importe quelle position angulaire. De plus, cette solution est insensible à la direction d'un choc mécanique de la montre.With such a form of execution presented to Figures 6a and 6b , this does not require synchronization between the toothed wheel and a lock provided to block it. Said toothed wheel can be locked in any angular position. In addition, this solution is insensitive to the direction of a mechanical shock of the watch.

Il est à noter que pour toutes les formes d'exécution susmentionnées, il peut également être prévu que l'actionneur piézoélectrique 21 soit activé électriquement pour occuper une position de blocage d'une des roues en combinaison ou non avec un verrou 22. Dans ce cas, quand l'actionneur piézoélectrique 21 n'est plus activé électriquement dans un mode de repos en combinaison ou non avec le verrou 22, il libère la roue, qui peut être entraînée en rotation à chaque activation du moteur électrique. L'actionneur piézoélectrique 21 peut également n'être fixé qu'à un seul support 23 à une de ses extrémités et libre de mouvement à son autre extrémité.It should be noted that for all the aforementioned embodiments, it can also be provided that the piezoelectric actuator 21 is electrically activated to occupy a locking position of one of the wheels in combination or not with a latch 22. In this case, case, when the piezoelectric actuator 21 is no longer electrically activated in a rest mode in combination or not with the latch 22, it releases the wheel, which can be rotated at each activation of the electric motor. The piezoelectric actuator 21 can also be attached to a single support 23 at one end and free movement at its other end.

A partir de la description qui vient d'être faite, plusieurs variantes de réalisation du mécanisme d'entraînement d'une ou plusieurs aiguilles et/ou d'un disque de quantième, qui est muni d'un dispositif de verrouillage peuvent être conçues par l'homme du métier sans sortir du cadre de l'invention définie par les revendications. Il peut être envisagé d'appliquer directement la lame de l'actionneur piézoélectrique contre des dents d'une roue de l'ensemble des roues d'engrenage. Plusieurs actionneurs piézoélectriques peuvent aussi être utilisés tout en garantissant un blocage d'une ou plusieurs roues entre deux activations du moteur électrique pour l'avance et le recul des aiguilles d'indication de l'heure. Le mécanisme peut entraîner aussi plus de deux aiguilles tout en permettant au dispositif de verrouillage de bloquer une partie du mécanisme entre deux activations du moteur électrique.From the description that has just been given, several embodiments of the drive mechanism of one or more needles and / or a date disk, which is provided with a locking device can be designed by those skilled in the art without departing from the scope of the invention defined by the claims. It may be envisaged to directly apply the blade of the piezoelectric actuator against the teeth of a wheel of the set of gear wheels. Several piezoelectric actuators can also be used while ensuring a locking of one or more wheels between two activations of the electric motor for the advance and the recoil of the time indicating hands. The mechanism can also drive more than two needles while allowing the locking device to block a portion of the mechanism between two activations of the electric motor.

Claims (10)

  1. Electromechanical watch with a mechanism (1) for driving one or more hands (8, 9) and/or at least one date disc, the mechanism including, mounted onto a plate or a frame of the watch, an electric motor (2), a set of gear wheels (3, 4, 5, 6, 7) connected to the electric motor to move the hand or hands (8, 9) and/or the date disc forward or backward on each actuation of the electric motor, and a device (20) for locking at least one wheel of the set of gear wheels,
    characterized in that the locking device (20) includes a piezoelectric actuator (21) or an electroactive polymer element or a shape memory alloy element for locking via a bolt (22) at least one of the wheels of the set of gear wheels (3, 4, 5, 6, 7) between each actuation of the electric motor, while allowing the set of gear wheels connected to said electric motor to move the hands (8, 9) and/or the date disc forward or backward on each actuation of the electric motor, and in that the bolt is guided in a through aperture (25) of a stud (24) of the locking device, said stud (24) being fixed to the plate or the frame of the electromechanical watch.
  2. Electromechanical watch with a mechanism (1) for driving one or more hands (8, 9) and/or at least one date disc, the mechanism including an electric motor (2), a set of gear wheels (3, 4, 5, 6, 7) connected to the electric motor to move the hand or hands (8, 9) and/or the date disc forward or backward on each actuation of the electric motor, and a device (20) for locking at least one wheel of the set of gear wheels,
    characterized in that the locking device (20) includes a piezoelectric actuator (21) or an electroactive polymer element or a shape memory alloy element for directly locking at least one of the wheels of the set of gear wheels (3, 4, 5, 6, 7) with one portion of said piezoelectric actuator (21) or electroactive polymer element or shape memory alloy element bearing on a surface of the wheel or against the wheel arbour, between each actuation of the electric motor, while allowing the set of gear wheels connected to said electric motor to move the hand or hands (8, 9) and/or the date disc forward or backward on each actuation of the electric motor.
  3. Electromechanical watch with a drive mechanism (1) according to claim 1, characterized in that the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element is a strip of rectangular shape, fixed at one end to a support (23) of a plate or a frame of the electromechanical watch, and in that at least one intermediate portion of the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element is arranged to lock via the bolt (22), one of the wheels of the set of gear wheels (3, 4, 5, 6, 7).
  4. Electromechanical watch with a drive mechanism (1) according to claim 1, characterized in that the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element is a strip of rectangular shape, a first end of which is fixed to a first support (23) of a plate or of a frame of the electromechanical watch, and a second end of which is fixedly held or free to move in a second support (23') of the plate or of the frame.
  5. Electromechanical watch with a drive mechanism (1) according to claim 1, characterized in that the bolt (22) is in the form of a cylindrical rod, a first end of which is arranged to be housed in one hole (14) among several holes made in a toothed wheel of the set of gear wheels (3, 4, 5, 6, 7) in a locking position while being pushed at a second end by the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element.
  6. Electromechanical watch with a drive mechanism (1) according to claim 5, characterized in that the number of holes (14) is equal to the number of teeth of the toothed wheel of the set of gear wheels (3, 4, 5, 6, 7), and in that the holes (14) are regularly spaced and arranged on a concentric circle of the wheel.
  7. Electromechanical watch with a drive mechanism (1) according to claim 2, characterized in that the piezoelectric actuator (21) in the form of a rectangular strip includes a through aperture (26) in an intermediate portion, which is traversed by an arbour (4a) of the toothed wheel (4), the intermediate portion being intended to bear, in the locking position, on the lower surface of the toothed wheel.
  8. Electromechanical watch with a drive mechanism (1) according to claim 2, characterized in that the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element, in the form of a rectangular strip, is arranged to directly lock one toothed wheel of the set of gear wheels (3, 4, 5, 6, 7) with one portion bearing on an arbour (7a) of the toothed wheel (7).
  9. Electromechanical watch with a drive mechanism (1) according to claim 2, characterized in that the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element takes the shape of a tube to be arranged on an arbour or axial tube (7a) of a toothed wheel (7) of the set of gear wheels (3, 4, 5, 6, 7), in that the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element takes the shape of an elliptical tube to hold the arbour of the toothed wheel clamped in a locking position, and in that the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element takes the shape of a circular tube to release the toothed wheel and to allow the hands (8, 9) to move forwards or backwards.
  10. Electromechanical watch with a drive mechanism (1) according to claim 9, characterized in that the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element takes the shape of an elliptical tube in a rest mode with no electrical actuation and the shape of a circular tube when the piezoelectric actuator (21) or the electroactive polymer element or the shape memory alloy element is actuated by an electrical signal.
EP13189578.1A 2012-11-23 2013-10-21 Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device Active EP2735923B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13189578.1A EP2735923B1 (en) 2012-11-23 2013-10-21 Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device

Applications Claiming Priority (2)

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EP12194079.5A EP2735922A1 (en) 2012-11-23 2012-11-23 Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device
EP13189578.1A EP2735923B1 (en) 2012-11-23 2013-10-21 Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device

Publications (2)

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EP2735923A1 EP2735923A1 (en) 2014-05-28
EP2735923B1 true EP2735923B1 (en) 2019-04-24

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EP12194079.5A Withdrawn EP2735922A1 (en) 2012-11-23 2012-11-23 Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device
EP13189578.1A Active EP2735923B1 (en) 2012-11-23 2013-10-21 Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device

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EP12194079.5A Withdrawn EP2735922A1 (en) 2012-11-23 2012-11-23 Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device

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US (1) US9188960B2 (en)
EP (2) EP2735922A1 (en)
JP (1) JP5824022B2 (en)
CN (2) CN203858461U (en)
HK (2) HK1186058A2 (en)

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EP2735922A1 (en) * 2012-11-23 2014-05-28 ETA SA Manufacture Horlogère Suisse Drive mechanism for the hands of an electro-mechanical watch, provided with a locking device
EP3537593B1 (en) * 2018-03-09 2024-04-24 ETA SA Manufacture Horlogère Suisse Device for rotating a toothed wheel

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Publication number Publication date
HK1186058A2 (en) 2014-03-07
EP2735922A1 (en) 2014-05-28
US20140146645A1 (en) 2014-05-29
JP5824022B2 (en) 2015-11-25
CN103838133A (en) 2014-06-04
CN203858461U (en) 2014-10-01
HK1198722A1 (en) 2015-05-29
EP2735923A1 (en) 2014-05-28
JP2014106231A (en) 2014-06-09
US9188960B2 (en) 2015-11-17
CN103838133B (en) 2017-01-11

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