Clock drive device

Abstract

Clockwork drive device (100), in particular for a system (300) for displaying time information or information derived from the time, in particular for an instantaneous jump calendar system, comprising: - an input mobile (13); - a main cam (11) having a main cam profile (11a, 11b, 11c), the main cam (11) being linked to the input mobile (i) with angular play or (ii) via a unidirectional coupling;- an auxiliary cam (12) linked to the input wheel, in particular fixed to or integral with the input wheel, and having an auxiliary cam profile (12a), - a cam follower (21) capable of cooperating with the profile (11a, 11b, 11c) and / or with the profile (12a), and - an energy accumulator (22) elastically returning the cam follower towards the profile (11a, 11b, 11c) of the main cam (11) and towards the profile (12a) of the auxiliary cam (12), the clockwork drive device (100), in particular the main cam and the auxiliary cam, being arranged so that the cam follower (21) comes into contact or substantially into contact with the auxiliary cam profile as soon as the drive of the main cam (11) is complete by an action of the energy accumulator (22) on said main cam (11) via the follower (21) of camel.;

Description

[0001] The invention relates to a watch drive device. The invention also relates to a watch calendar comprising such a watch drive device. The invention further relates to a watch movement comprising such a watch drive device or such a watch calendar. The invention also relates to a timepiece comprising such a watch movement or such a watch drive device or such a watch calendar. The invention also relates to a method for operating such a watch movement or such a timepiece or such a watch drive device or such a watch calendar.

[0002] Known in the state of the art are instantaneous clock calendar systems which have a drive wheel equipped with a cam which cooperates with an energy accumulation device, such as a cam lever associated with a spring.

[0003] Driven by a drive wheel, the cam allows the energy storage device to be armed in a winding phase, and subsequently, to restore the energy during an instantaneous driving phase of the calendar. The cam is then driven and rotates relative to the drive wheel. The restored energy is used to drive the cam and a mechanism arranged downstream of the cam.

[0004] At the end of the instantaneous drive phase, in a catch-up phase, the cam is immobilized until it is caught and driven again by the drive wheel so as to arm the energy accumulation device.

[0005] The catch-up phase can last approximately 4 to 11 hours depending on the design of the calendar. During this catch-up phase, the drive wheel rotates idle and consumes very little energy compared to the winding phase. This results in variations in the amplitude of the watch movement's oscillator due to the difference in load on the drive wheel between the catch-up and winding phases respectively.

[0006] Patent EP2407833B1 discloses a solution using an instantaneous date drive wheel comprising an auxiliary energy accumulation means intended to compensate for the gear play of a time display train.

[0007] The instant drive mobile operates in a conventional manner, and successively presents: a winding phase in which a calendar cam is driven by a drive wheel so as to wind a spring via a cam lever, an instantaneous driving phase in which the spring is unwound, the cam then becomes driving and advances relative to the drive wheel, and a catch-up phase, in which the drive wheel catches up with the advance of the calendar cam immobilized after the jump.

[0008] The particularity of the disclosed solution lies in the fact that the auxiliary energy storage means is arranged between the calendar cam and the drive wheel. The auxiliary energy storage means is armed during the catch-up phase and is intended to generate a resistive torque to the drive wheel. Thus, the time display gear train is also tensioned during the catch-up phase, limiting the gear play of said gear train.

[0009] However, it is necessary that the winding torque of the auxiliary energy storage means be lower than the torque required to wind the cam rocker spring. Therefore, the auxiliary energy storage means cannot provide significant energy accumulation equivalent to that provided by winding the cam rocker spring.

[0010] The aim of the invention is to provide a watch drive device making it possible to improve the devices known from the prior art. In particular, the invention proposes a watch drive device making it possible to distribute energy consumption as well as possible over time, in particular over a period of rotation of a drive wheel.

[0011] According to the invention, a training device is defined by claim 1.

[0012] Embodiments of the training device are defined by claims 2 to 9.

[0013] According to the invention, a clock calendar is defined by claim 10.

[0014] According to the invention, a watch movement is defined by claim 11.

[0015] According to the invention, a timepiece is defined by claim 12.

[0016] According to the invention, an operating method is defined by claim 13.

[0017] Modes of carrying out the method of operation are defined by claims 14 and 15.

[0018] The attached drawings represent, by way of example, two embodiments of a timepiece according to the invention. There figure 1 is a view of a first embodiment of a timepiece according to the invention, a drive device being seen from the dial side. The figure 2is a view of the first embodiment of the timepiece according to the invention, the drive device being seen from the movement side. The figure 3 is a set of views of the training device including an exploded view and two perspective views. The figures 4 to 10 are views of operating sequences of the first embodiment of the drive device. The figures 11 to 17 are views of operating sequences of a second embodiment of the drive device, the figures 11 to 17 illustrating the second embodiment being respectively equivalent to the figures 4 to 10 illustrating the first embodiment.

[0019] A first embodiment of a timepiece 500 is described below in detail with reference to figures 1 to 10 .

[0020] The timepiece 500 is for example a watch, in particular a wristwatch. The timepiece 500 comprises a watch movement 400 intended to be mounted in a timepiece case or box in order to protect it from the external environment.

[0021] The 400 watch movement is a mechanical movement, notably an automatic movement, or a hybrid movement or an electronic movement.

[0022] The 400 watch movement includes a 300 watch calendar.

[0023] The 300 watch calendar includes: at least one display member 200, in particular a date display member, in particular a date display disc, and a watch drive device 100, the at least one display member 200 and the drive device 100 being arranged so that the drive device 100 is capable of driving the at least one display member 200. The drive is of the instantaneous or instantaneous jump type.

[0024] The calendar system 300 makes it possible to display, via the at least one display member 200, at least one item of calendar information such as day, date, month, year, leap year, or moon phase information.

[0025] The at least one calendar information can be carried by the at least one display member 200 such as a needle or a disc.

[0026] The watch drive device 100 comprises: an input wheel 13; a main cam 11 having a main cam profile 11a, 11b, 11c, the main cam 11 being connected to the input wheel (i) with angular play or (ii) via a unidirectional coupling; an auxiliary cam 12 connected to the input wheel, in particular fixed to the input wheel or secured to the input wheel, and having an auxiliary cam profile 12a, a cam follower 21 capable of cooperating with the profile 11a, 11b, 11c and / or with the profile 12a, and an energy accumulator 22 elastically returning the cam follower 21 towards the profile 11a, 11b, 11c of the main cam 11 and towards the profile 12a of the auxiliary cam 12.

[0027] The watch drive device 100, in particular the main cam and the auxiliary cam, is arranged so that the cam follower 21 comes into contact or substantially into contact with the auxiliary cam profile as soon as the main cam 11 has been driven by an action of the energy accumulator 22 on said main cam 11 via the cam follower 21. Thus, the energy accumulator can be armed as soon as the main cam 11 has been driven, this driving being carried out by an action of the energy accumulator 22 on said main cam 11 via the cam follower 21.

[0028] Advantageously, the watch drive device 100, in particular the main cam and the auxiliary cam, is arranged so as to arm the energy accumulator 22 via the cam follower 21 over substantially all or the entire rotation period of the input wheel set 13, in particular over a period of 24 hours, with the exception of a drive phase where the main cam is driving. This makes it possible to minimize and smooth out over time the mechanical power required to arm the energy accumulator.To do this, the drive device, in particular the profiles of the main cam and the auxiliary cam, are arranged so that the mechanical power supplied to the energy accumulator 22 is constant or substantially constant throughout the duration during which the main cam 11 is not driving, or more particularly throughout the duration during which the main cam 11 is not driven by the energy accumulator 22 via the cam follower 21.

[0029] The input mobile 13 and the auxiliary cam 12 are part of a first mobile.

[0030] The main cam 11 is part of a second mobile.

[0031] The first and second mobiles are pivoted within a frame of the 400 watch movement.

[0032] The second mobile comprises a drive element 14 kinematically linked to the main cam 11 or secured to the main cam 11. The drive element 14 can be fixed to the main cam 11. The drive element 14 is intended to directly and periodically drive the display member 200.

[0033] The main cam 11 is intended to cooperate with an energy accumulation device 20 so as to periodically accumulate and instantly and periodically restore the energy necessary for driving the display member 200.

[0034] The energy storage device 20 comprises: a cam follower, such as a cam rocker 21 pivoted within the frame, and an energy accumulator 22, such as an elastic return means 22, which makes it possible to accumulate the energy necessary for the instantaneous driving of the display member 200. In addition, the elastic energy accumulator 22 tends to return the rocker 21 against the main cam 11. The energy accumulator 22 may comprise a spring 22, in particular a leaf spring.

[0035] The input wheel 13 comprises a drive wheel 13 secured to the auxiliary cam 12. The input wheel is constantly driven by a gear train of the watch movement 400. It is intended to drive the second wheel, or more particularly the main cam 11 by means of a decoupling device.

[0036] The uncoupling device is designed in such a way as to allow in particular: a drive of the second mobile by the first mobile, or a joining of the first and second mobile during an arming phase of the energy accumulation device 20, and a decoupling or a separation of the first and second mobile during an instantaneous drive phase.

[0037] The instantaneous drive phase corresponds to the phase where the energy stored by the energy storage device 20 is restored, and where the display member 200 is driven instantaneously by the drive element 14.

[0038] The uncoupling device comprises a portion 15, arranged on one of the first or second mobiles, intended to cooperate with an angular stop 16a, arranged on the other of the first or second mobiles, so that the rotation of the input mobile 13 can drive the main cam 11 in rotation, in particular during the arming phase.

[0039] During the instantaneous drive phase, the uncoupling device allows a degree of freedom in rotation to the second mobile relative to the first mobile, or more particularly a degree of freedom in rotation to the main cam 11 relative to the input mobile 13.

[0040] This degree of freedom may in particular be embodied by the conformation of the portion 15, which is capable of moving within a groove 16, in an orthoradial direction relative to the axis of rotation of the first and / or second mobile. In the first embodiment illustrated by the figures, the groove 16 comprises the angular stop 16a. In particular, the groove 16 extends between two angular stops 16a, 16b. Alternatively, this degree of freedom could be embodied by a freewheel.

[0041] Preferably, the input wheel 13 rotates at a constant speed. Consequently, the uncoupling device must allow the main cam 11 to travel instantly and substantially the entire angular travel necessary for the drive phase. Consequently, during the drive phase, the portion 15 uncouples and moves relative to the angular stop 16a, within the groove 16.

[0042] At the end of the instantaneous drive phase, the drive element 14 and the main cam 11 are stopped while the input wheel set 13 catches up with the latter in a catch-up phase. More particularly, the angular travel that the main cam 11 has traveled during the instantaneous drive phase must be caught up, so that the portion 15 is again in contact with the angular stop 16a and drives the main cam 11 again. The catch-up phase therefore follows the drive phase and precedes the winding phase.

[0043] A particularity of the solution lies in the fact that, immediately after the instantaneous drive phase of the display member 200, the rocker 21 is in contact with the auxiliary cam 12 and is out of range of the main cam 11, so as to begin a first winding of the energy storage device 20 as soon as the instantaneous drive phase ends. This first winding lasts at least the entire catch-up phase and until the cam rocker 21 is again in contact with the main cam 11.

[0044] Preferably, the rocker 21 is in contact with the auxiliary cam 12 exclusively during the catch-up phase.

[0045] From one phase to the other, the contact transitions of the rocker 21 from the main cam 11 to the auxiliary cam 12, and vice versa, are dimensioned so as to be as continuous as possible, without sudden interruption or without significant disturbance with regard to the energy consumption of the watch movement 400 and thus avoid amplitude variations.

[0046] In the illustrated embodiments, the instantaneous drive device 100 is provided to enable instantaneous driving of a date calendar system 300 comprising a date disc 200 indexed by a jumper.

[0047] The first and second mobiles are arranged coaxially and pivot about an axis A1. Thus, the main cam 11 and the auxiliary cam 12 are pivoted about the same axis A1.

[0048] The drive element 14 is a date finger 14 intended to cooperate with a toothing 201 of the date disc 200 during the instantaneous drive phase. The date finger 14 is here welded to a core 17 itself driven and / or riveted onto the main cam 11.

[0049] The core 17 is pivoted on the frame around the axis A1.

[0050] The profile of the main cam 11 capable of cooperating with the energy accumulation device 20 successively comprises an arming portion 11a, a restitution portion 11b and a stop portion 11c. The functionalities of these portions are described in more detail below.

[0051] The rotation period of the drive wheel 13 is 24 hours, so as to enable the calendar system 300 to be driven by at least one step per day. In other words, for each rotation period of the drive wheel 13, the instantaneous drive device 100 is respectively and successively: in the catch-up phase, then in the arming phase, then in the instant training phase.

[0052] The auxiliary cam 12 is secured to the drive wheel 13 by a drive and / or riveting. Alternatively, the drive wheel 13 and the auxiliary cam 12 could be made in one piece, i.e. they would then form a single-piece assembly.

[0053] The drive wheel 13 and the auxiliary cam 12 are assembled so as to pivot on the core 17, around the axis A1. Alternatively, they could pivot directly on the frame.

[0054] The auxiliary cam 12 comprises a pre-arming portion of the profile 12a capable of cooperating with the energy accumulation device 20, during the catch-up phase.

[0055] The uncoupling device is embodied by a stud 15 assembled or integrally formed with the main cam 11, capable of cooperating with an angular stop 16a arranged at a first end of a groove 16 machined on a portion of the periphery of the auxiliary cam 12. Alternatively, the groove 16 could be machined on the drive wheel 13.

[0056] The length of the groove 16 is dimensioned so as to allow the stud 15 to travel substantially the entire angular travel required for the drive phase. In other words, the angle of rotation that the stud 15 can travel within the groove 16 must at least correspond to the angle of rotation of the date finger 14 and the main cam 11 during the drive phase.

[0057] Alternatively or additionally, the angular travel required for the drive phase, more particularly the angular travel of the stud 15, can be limited by the second angular stop 16b arranged at a second end of the groove 16.

[0058] Advantageously, the cam rocker 21 comprises a bearing, or more particularly a ruby ​​stone or roller 23. The latter is capable of cooperating with the respective profiles of the main cam 11 and the auxiliary cam 12.

[0059] The roller 23 makes it possible to reduce the friction torque induced by the bearing force of the lever 21 against the main cam 11 and / or the auxiliary cam 12. Consequently, this roller 23 makes it possible to reduce the energy consumption and the amplitude losses of the oscillator of the watch movement 400.

[0060] A method of carrying out a method of operating the timepiece or the watch movement or the watch calendar or the drive device is described below. Arming phase

[0061] During the arming phase, illustrated in the figure 4 , the roller 23 is located on a winding portion 11a. This portion makes it possible to wind the energy accumulation device 20 so as to accumulate the energy necessary for the instantaneous driving of the display member 200 by at least one step. During the winding phase, the main cam 11 is driven by the input wheel set 13 by means of the stud 15 in abutment against the angular stop 16a of the groove 16.

[0062] The energy accumulation device 20, and more particularly the roller 23, is preferably out of reach of the auxiliary cam 12 during this phase.

[0063] Preferably, the winding portion 11a is shaped so as to generate a constant or substantially constant consumption and loss of amplitude at the balance. In other words, this portion makes it possible to obtain a constant or substantially constant winding torque at the input wheel set 13.

[0064] In other words, during the winding phase, the follower 21 follows the profile 11a of the main cam 11, while energy is accumulated in the spring 22 and the profile of the auxiliary cam 12 is not in contact with the follower 21. It is therefore the input wheel set which drives the main cam, the follower 21 follows the profile 11a of this cam and the spring 22 is progressively wound. The energy is therefore transferred according to the following chain: barrel, gear train, input wheel set 13, main cam 11, follower 21, spring 22. Training phase

[0065] When the roller 23 reaches the top of the main cam 11, as shown in the Figure 5, at the end of the arming portion 11a of the profile of the main cam 11, at the exact moment of the transition with a restitution portion 11b of the profile of the main cam 11, the roller 23 instantly travels the latter until reaching a stop portion 11c of the profile of the main cam 11.

[0066] During this training phase, as illustrated in figure 6 , the energy stored by the energy accumulation device 20 is restored for the instantaneous driving of the display member 200 by the date finger 14. In other words, at midnight, the main cam 11 and the date finger 14 become motors thanks to the restitution of the previously accumulated energy, and move relative to the input wheel set 13. From then on, the stud 15 disengages from the angular stop 16a and instantly travels the angular travel necessary for the driving phase, within the groove 16.

[0067] The auxiliary cam 12 is always out of reach of the energy accumulation device 20, and more particularly of the roller 23, during the drive phase.

[0068] At the end of the drive phase, it is advantageous for the date finger 14 to be stopped and remain positioned in an interference position with the toothing 201 of the date disc 200 in order to obstruct it and avoid an additional untimely jump due to its inertia and the considerable energy which is released during this phase.

[0069] To do this, roller 23 is located, as illustrated in the figure 7 , on the stop portion 11c which is sized so as to dissipate the residual kinetic energy after driving the display member 200.

[0070] In a complementary or alternative manner, the second stop 16b can be used for the partial or total dissipation of said residual kinetic energy.

[0071] The stopping of the display member 200 is also instantaneous. In other words, the instantaneous drive phase includes the stopping of the display member 200.

[0072] In other words, during the drive phase, the main cam 11 is driven, the follower 21 descends abruptly along the profile 11b of the main cam 11 and causes it to disengage from the wheel 13 as well as the jump drive of the display member 200. In this phase, it also turns out that the profile of the auxiliary cam 12 is not in contact with the follower 21. The energy is therefore transferred according to the following chain: spring 22, follower 21, main cam 11, display member 200. Catch-up phase

[0073] As described above, the main cam 11 has become uncoupled from the input wheel 13 during the instantaneous drive phase. Therefore, the angular stop 16a must catch up with the stud 15 to drive the main cam 11 again.

[0074] Advantageously, during this catch-up phase, as illustrated in the figure 8 , a pre-arming portion of the profile 12a of the auxiliary cam 12 comes into contact with the energy accumulation device 20, and more particularly with the roller 23. This pre-arming portion is shaped so as to begin the arming of the energy accumulation device 20 successively to the instantaneous drive phase, until the energy accumulation device 20 cooperates again with the arming portion 11a of the profile of the main cam 11 and initiates the arming phase.

[0075] Preferably, as for the winding portion 11a, the pre-winding portion of the profile 12a is shaped so as to generate a constant winding torque at the mobile input level 13, and consequently a constant consumption and loss of amplitude at the balance.

[0076] Additionally, as illustrated on the figures 9 And 10, the pre-arming portion of the profile 12a is preferably sized so as to match the arming portion 11a at the end of the catch-up phase so that the transition of the roller 23 from the pre-arming portion of the profile 12a to the arming portion 11a is as continuous as possible, without sudden interruption or without significant disturbance, with regard to the arming torque observed at the level of the input mobile 13, and therefore with regard to the energy consumption.

[0077] The restitution portion 11b of the profile of the main cam 11 extends along a first angular portion corresponding to the travel required by the second wheel set for driving the calendar system 300. The angular portion 11b is complementary to the sum of the angular portions of the winding portion 11a and the stop portion 11c.

[0078] The pre-arming portion of the profile 12a of the auxiliary cam 12 allowing the first arming of the energy accumulation device 20 can extend along a second angular portion at least equal or at least substantially equal to the first angular portion of the restitution portion 11b.

[0079] Consequently, the arming portion 11a of the profile of the main cam 11 allowing a second arming of the energy accumulation device 20 extends according to a third angular portion complementary to the second angular portion. Alternatively, the third angular portion may be zero or substantially zero in the case where the pre-arming portion of the profile 12a is adapted so as to allow complete arming of the energy accumulation device 20.

[0080] The sum of the second and third angular portions is advantageously equal to the angle that the input mobile 13 travels over substantially all or the entirety of its rotation period.

[0081] In other words, during the catch-up phase, the follower 21 leaves the profile of the main cam 11 and instead begins to follow the profile of the auxiliary cam 12, thereby pre-loading the spring 22. This has the effect of smoothing the load on the input wheel set. During the catch-up phase, the main cam 11 is not driven. Nor does it drive any other element.

[0082] Thus, a mode of execution of the method of operating the timepiece 500 or the watch movement 400 or the watch calendar 300 or the watch drive device 100 comprises at least one iteration, and preferably several iterations, of the following steps: driving the main cam 11 by an action of the energy accumulator 22 on the main cam via the cam follower 21, then accumulation of energy in the energy accumulator 22 by an action of the auxiliary cam 12 on the energy accumulator 22 via the cam follower 21.

[0083] The method of operation or the at least one iteration may comprise accumulating energy in the energy accumulator 22 by an action of the main cam 11 on the energy accumulator 22 via the cam follower 21.

[0084] So : the main cam 11 is driven by an action of the energy accumulator 22 via the cam follower 21 on a first angular portion, and the auxiliary cam 12 supplies energy to the energy accumulator 22 via the cam follower on a second angular portion at least equal or at least substantially equal to the first angular portion, and the main cam 11 supplies energy to the energy accumulator 22 via the cam follower on a third angular portion which is i) complementary to the second angular portion and / or ii) zero or substantially zero.

[0085] Preferably, the drive of the main cam 11 during the drive phase is an instantaneous drive.

[0086] Of course, the present solution is not limited to a simple calendar system, but is also particularly suitable for calendar systems requiring, for example, more energy, such as an annual calendar or a perpetual calendar. Furthermore, a watch drive device according to the invention can be used for a system for displaying any time information or information derived from the time (i.e. derived from the oscillator), in particular information distinct from calendar information. The watch drive device can in particular be used in a system for displaying the time (with a jumping display) or the phases of the Moon.

[0087] The first and second mobiles of the drive device could not be coaxial, but pivoted on two separate axes, preferably parallel. They would then be connected for example by a gear. The main cam 11 and the auxiliary cam 12 can thus be pivoted around separate axes, in particular around parallel axes.

[0088] Thus, a second embodiment of a timepiece 500 is described below in detail with reference to figures 11 to 17 (equivalent to figures 4 to 10 relating to the first embodiment).

[0089] The timepiece 500 is for example a watch, in particular a wristwatch. The timepiece 500 comprises a watch movement 400 intended to be mounted in a timepiece case or box in order to protect it from the external environment.

[0090] The 400 watch movement is a mechanical movement, notably an automatic movement, or a hybrid movement or an electronic movement.

[0091] The 400 watch movement includes a 300 watch calendar.

[0092] The 300 watch calendar includes: at least one display member 200, in particular a date display member, in particular a date display disc, and a watch drive device 100, the at least one display member 200 and the drive device 100 being arranged so that the drive device 100 is capable of driving the at least one display member 200. The drive is of the instantaneous or instantaneous jump type.

[0093] The calendar system 300 makes it possible to display, via the at least one display member 200, at least one item of calendar information such as day, date, month, year, leap year, or moon phase information.

[0094] The at least one calendar information can be carried by the at least one display member 200 such as a needle or a disc.

[0095] The watch drive device 100 comprises: an input wheel 13; a main cam 11 having a main cam profile 11a, 11b, 11c, the main cam 11 being connected to the input wheel (i) with angular play or (ii) via a unidirectional coupling; an auxiliary cam 12 connected to the input wheel, in particular fixed to the input wheel or secured to the input wheel, and having an auxiliary cam profile 12a, a cam follower 21 capable of cooperating with the profile 11a, 11b, 11c and / or with the profile 12a, and an energy accumulator 22 elastically returning the cam follower 21 towards the profile 11a, 11b, 11c of the main cam 11 and towards the profile 12a of the auxiliary cam 12.

[0096] The first and second mobiles of the drive device are not coaxial, but pivoted on two separate axes, preferably parallel. They are then connected for example by a gear. The main cam 11 and the auxiliary cam 12 can thus be pivoted around separate axes, in particular around parallel axes.

[0097] The auxiliary cam 12 pivots along an axis A2 parallel to the axis A1 and is integral with a wheel 18 kinematically linked or kinematically integral with the drive wheel 13 by, in particular, a gear.

[0098] The stud 15 of the uncoupling device is capable of cooperating with the angular stops 16a and 16b arranged at the ends of the groove 16 machined on the drive wheel 13.

[0099] The auxiliary cam 12 has the profile 12a comprising a pre-winding portion capable of cooperating with the energy accumulation device 20, during the catch-up phase. Of course, the dimensioning of the angular extent of the pre-winding portion of the profile 12a must take into account the transmission ratio between the main cam 11 and the auxiliary cam 12, more particularly between the drive wheel 13 and a wheel 18. For example, with a transmission ratio of 2, the angular extent of the pre-winding portion of the profile 12a must be twice as high as the angular portion corresponding to the travel required by the second wheel set for driving the calendar system 300.In other words, with the second embodiment shown, the pre-arming portion of the profile 12a of the auxiliary cam 12 allowing the first arming of the energy accumulation device 20 can extend along a second angular portion at least 2 times greater or at least substantially 2 times greater than the first angular portion of the restitution portion 11b.

[0100] The cam rocker 21 comprises a second portion or more particularly a second bearing, such as a second stone or a ruby ​​roller 24, capable of cooperating with the profile of the auxiliary cam 12.

[0101] Whatever the embodiment or variant, the uncoupling device could be a unidirectional connecting device such as a freewheel within which the portion 15 would for example be a portion of a ratchet intended to cooperate with the angular stop 16a.

[0102] Whatever the embodiment or variant, the stud 15 could be arranged on the first mobile, for example on the auxiliary cam 12 or on the input mobile 13, and the groove 16 could consequently be arranged on the second mobile, for example on the main cam 11.

[0103] In the embodiment described above, a roller 23 constitutes a single support element making it possible to cooperate (sequentially) by contact with the main cam 11 and with the auxiliary cam 12. Nevertheless, whatever the embodiment or variant, the cam follower may comprise: a first support element on the main cam 11, and a second support element on the auxiliary cam 12.

[0104] Thus, the first support element may be intended to cooperate exclusively with the main cam 11 and the second support element may be intended to cooperate exclusively with the auxiliary cam 12.

[0105] In the above description, it is intended that the calendar system 300 be driven at least one step for each rotation period of the input wheel 13. However, whatever the embodiment or variant, the instantaneous drive device could be adapted so as to drive the calendar system for each multiple or each sub-multiple of the rotation period of the input wheel 13. Of course, the geometries of the main and auxiliary cams would have to be provided accordingly.

[0106] Regardless of the embodiment or variant, the auxiliary cam 12 makes it possible to arm the energy accumulator 22 at least partially. The auxiliary cam 12 can be used to perform a first arming of the energy accumulator 22 and the main cam 11 can be used to perform a second arming of the energy accumulator 22, complementary to the first arming. Alternatively, the auxiliary cam 12 can be used to perform the complete arming of the energy accumulator 22 by adapting the pre-arming portion of the profile 12a. In this hypothesis, the winding portion 11a is superfluous and the main cam 11 has the sole functions of cooperating with the follower 21 to transmit the energy restored by the energy accumulator thanks to the restitution portion 11b and potentially to dissipate the residual kinetic energy after the driving of the display member 200 thanks to the stop portion 11c.

[0107] Whatever the embodiment or variant, the auxiliary cam 12 could actuate the energy accumulation device 20 by a portion of the rocker 21 other than that capable of cooperating with the main cam 11.

[0108] Regardless of the embodiment or variation, the term "cam" has a broad meaning and includes any geometry cooperating with a cam follower. In particular, a pin cooperating with a cam follower is a cam.

[0109] For example, the auxiliary cam 12 could be in the form of a portion or a pin, eccentric relative to the axis of rotation, capable of cooperating with a portion of the lever 21. Preferably, the conformation of the profile of said portion of the lever 21 with said pin would be designed so as to allow arming with a constant torque to the input wheel set 13.

[0110] More generally, the main and auxiliary cams could have simple geometries, such as pins, cooperating with one or more suitable profiles provided on the rocker 21 of the energy accumulation device.

[0111] The solutions described above make use of two calendar cams, in particular superimposed ones, which advantageously make it possible to smooth and limit variations in energy consumption over 24 hours. More generally, the proposed solutions advantageously make it possible to smooth the mechanical winding power over the entire rotation period of the input wheel set 13, with the exception of the instantaneous drive phase. Consequently, the energy consumed and therefore the amplitude losses of the balance can be constant, unlike the known solutions of the state of the art.

[0112] Furthermore, since the energy required to instantly drive the display organ can be accumulated over a longer rotation period than known solutions, it is also possible to minimize the mechanical winding power for the same amount of total accumulated energy. By increasing the winding time from 13 hours to 24 hours, it is, for example, possible to reduce the winding power by 46%. By increasing the winding time from 20 hours to 24 hours, it is, for example, possible to reduce the winding power by 17%.

[0113] Advantageously, the instantaneous drive device 100 also allows direct drive of the display member 200, with the implementation of a single drive element 14. Indeed, the solution does not require a rocker arranged at the interface of said members.

[0114] This conformation advantageously allows bidirectional driving of the display member 200. Indeed, thanks to the uncoupling device embodied by a portion 15 cooperating with a groove 16, the embodiments presented also allow driving of the display member 200 by actuating the input wheel set 13 in the opposite direction of operation, for example when setting the time of the watch movement 400.

[0115] Preferably, throughout this application, by "instantaneous" is meant a duration of the order of one or more fractions of a second.

Claims

1. Clock drive device (100), in particular for a system (300) for displaying time or time-derived information, in particular for an instantaneous jump calendar system, comprising: - an input wheel set (13); - a main cam (11) having a main cam profile (11a, 11b, 11c), the main cam (11) being connected to the input wheel set (i) with angular play or (ii) via a one-way coupling;- an auxiliary cam (12) linked to the input wheel set, in particular fixed to the input wheel set or secured to the input wheel set, and having an auxiliary cam profile (12a), - a cam follower (21) capable of cooperating with the main cam profile (11a, 11b, 11c) and / or with the auxiliary cam profile (12a), and - an energy accumulator (22) elastically biasing the cam follower towards the main cam profile (11a, 11b, 11c) and towards the auxiliary cam profile (12a), the watch drive device (100), in particular the main cam and the auxiliary cam, being arranged so that the cam follower (21) comes into contact or substantially into contact with the auxiliary cam profile as soon as the main cam (11) is driven by an action of the energy accumulator (22) on said cam main (11) via the cam follower (21).; 2. Watch drive device (100) according to the preceding claim,characterized in that the watch drive device (100), in particular the main cam and the auxiliary cam, is arranged so as to arm the energy accumulator (22) via the cam follower (21) over substantially the entire rotation period of the input wheel set (13), in particular over a period of 24 hours, with the exception of the drive phase where the main cam is driving.

3. Watch drive device (100) according to claim 1 or 2, characterized in that the main cam (11) and the auxiliary cam (12) are pivoted around the same axis (A1).

4. Watch drive device (100) according to claim 1 or 2, characterized in that the main cam (11) and the auxiliary cam (12) are pivoted around separate axes, in particular around parallel axes.

5. Watch drive device (100) according to one of the preceding claims, characterized in thatthe drive device is arranged so that: - the main cam (11) is driven by an action of the energy accumulator (22) via the cam follower (21) on a first angular portion, and - the auxiliary cam (12) supplies energy to the energy accumulator (22) via the cam follower on a second angular portion at least equal or at least substantially equal to the first angular portion, and - the main cam (11) supplies energy to the energy accumulator (22) via the cam follower on a third angular portion which is (i) complementary to the second angular portion and / or (ii) zero or substantially zero.

6. Watch drive device (100) according to one of the preceding claims, characterized in thatthe drive device, in particular the profiles of the main cam and the auxiliary cam, are arranged so that the mechanical power supplied to the energy accumulator (22) is constant or substantially constant throughout the duration during which the main cam (11) is not driven by the energy accumulator (22) via the cam follower (21).

7. Watch drive device (100) according to one of the preceding claims, characterized in that the cam follower (21) comprises a rocker (21).

8. Watch drive device (100) according to one of the preceding claims, characterized in that the energy accumulator (22) comprises a spring (22), in particular a leaf spring.

9. Watch drive device (100) according to one of the preceding claims, characterized in thatthe main cam (11) is kinematically linked to a drive element (14) of a time information display element (200), in particular fixed to a drive element (14) of a time information display element (200), such as a finger (14), cooperating with a toothing (201) of a time information display element (200).

10. Clock calendar (300), in particular a simple date calendar or an annual date calendar or a perpetual date calendar, comprising a clock drive device (100) according to one of the preceding claims, the calendar comprising an element for displaying time information (200), such as a disc bearing numbers, including teeth (201).

11. Watch movement (400) comprising: - a watch drive device (100) according to one of claims 1 to 9, and / or - a watch calendar (300) according to the preceding claim.

12. Timepiece (500), in particular wristwatch, comprising: - a watch movement (400) according to the preceding claim, and / or - a watch calendar (300) according to claim 10, and / or - a watch drive device (100) according to one of claims 1 to 9.

13. Method for operating a timepiece (500) according to the preceding claim or a timepiece movement (400) according to claim 11 or a timepiece calendar (300) according to claim 10 or a timepiece drive device (100) according to one of claims 1 to 9, the method comprising at least one iteration of the following steps: - driving the main cam (11) by an action of the energy accumulator (22) on the main cam via the cam follower, then - accumulating energy in the energy accumulator (22) by an action of the auxiliary cam (12) on the energy accumulator (22) via the cam follower.

14. Operating method according to the preceding claim, characterized in that the method comprises accumulating energy in the energy accumulator (22) by an action of the main cam (11) on the energy accumulator (22) via the cam follower (21).

15. Operating method according to claim 13 or 14, characterized in that the main cam drive (11) is an instantaneous drive.

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