Patent Application
20220113678
This application claims priority of European patent application No. EP20201888.3 filed Oct. 14, 2020, the content of which is hereby incorporated by reference herein in its entirety.
The invention relates to a system for driving and holding in position a mobile unit for displaying time or time derivative information. The invention relates also to a horological calendar system comprising such a driving and position-holding system. The invention relates also to a movement comprising such a driving and position-holding system or such a horological calendar system. The invention relates also to a timepiece comprising such a movement, such a driving and position-holding system or such a horological calendar system. The invention relates also to a method for operating such a timepiece, such a movement, such a driving and position-holding system or such a horological calendar system.
The document CH525507 discloses a date driving mechanism that disarms a jumper of a date disk at the moment of the instantaneous triggering of the date transition. The energy necessary for the date transition is accumulated in a return spring arranged between a date driving wheel and a date finger. Before midnight, i.e. before the triggering of the date transition, the date finger is retained by the date disk, which is itself retained by the jumper armed by a jumper cam. This jumper cam is linked kinematically to the date driving wheel that makes one revolution in 24 hours. At midnight, a notch arranged on the perimeter of the jumper cam disarms the jumper. At this precise moment, the energy accumulated by the return spring then becomes sufficient for the date finger to be able to overcome the jumper, generating the driving of the date disk to the next date.
By being linked to the date driving wheel, the rotation of the jumper cam is a dragging rotation, which does not allow the jumper to be rearmed instantaneously after the date transition. The result thereof is therefore a degraded functionality of the calendar and an angular play of the date disk that is potentially perceptible, for the time it takes for the jumper to be rearmed by the jumper cam. Such a play is unacceptable for a luxury timepiece. Moreover, in a particular case in which it would be possible to carry out a rapid setting of the date, such a configuration of the jumper and of the jumper cam could generate malfunctions and/or might not allow the expected torques to be generated, which would prejudice the quality of the sensations felt on the stem.
The document U.S. Pat. No. 4,240,249 describes a calendar system that makes it possible to display the date and the day of the week. It comprises a date disk driven by a date finger secured to an energy storage wheel, and a days disk comprising a Maltese cross driven by a pin. The latter is also secured to said storage wheel. The storage wheel is coaxial to a calendar driving wheel that makes one revolution in 24 hours. A spring arranged between the calendar driving wheel and the storage wheel makes it possible to accumulate the energy necessary for the instantaneous transition of the date and day displays. The storage wheel and the calendar driving wheel are both driven by the hours wheel on two distinct levels with different transmission ratios. The storage wheel revolves more slowly than the calendar driving wheel. The relative speed between the two wheels allows for the arming of the return spring. A portion of the toothing is truncated on the perimeter of the storage wheel. It allows the rotation of the storage wheel at midnight, independently of the driving wheel, therefore generating the restoration of the energy accumulated by the return spring and the instantaneous driving of the displays. More particularly, the date finger drives the date disk by one pitch and, simultaneously, the pin drives the Maltese cross, secured to the days disk, also by one pitch. Furthermore, the Maltese cross also controls the arming of the jumper indexing the date disk. Thus, during the date transition, the jumper is disarmed so as to minimize the energy necessary for the date transition. The use of a Maltese cross to control the date jumper is not optimal with regard to the installation of such a solution in a movement.
The document CH591720 discloses also a calendar mechanism that makes it possible to display the date and the day of the week. It comprises a dragging calendar driver, comprising two coaxial and superposed jumper cams, controlling the arming (or the latching) of a jumper simultaneously indexing the date display and the days display. The first jumper cam comprises a hollow on its outer profile shaped so as to disarm (or unlatch) an elastic part of the jumper upon the date transition. After the jump, the arming (or the latching) of the jumper is performed by the second cam which comprises a finger on its outer profile acting on another, rigid part of the jumper to latch it in the toothings of the displays. The jumper is thus completely latched after the date transition for several hours, until the elastic part of the jumper once again cooperates with the outer profile of the first jumper cam and the other, rigid part of the jumper is released by the second jumper cam. This mechanism presents the drawback of requiring two cams or at least two cam levels to control the arming and the disarming of the jumper. Furthermore, this mechanism is configured so as to latch the jumper, namely completely fix the jumper in a given position, which inevitably generates ranges of non-correction if such a calendar mechanism is provided with a correction device comprising a rapid corrector of the date indication and/or of the day indication.
The aim of the invention is to provide a system for driving and holding in position a mobile unit for displaying time or time derivative information that makes it possible to improve the systems known from the prior art. In particular, the invention proposes a simple and reliable system which makes it possible to limit the energy necessary to perform the time or time derivative information display jumps.
A driving and position-holding system according to the invention is defined by the following point 1.
1. A system for driving and holding in position a mobile unit for displaying time or time derivative information, notably for displaying dates, comprising:
Different embodiments of the system are defined by the following points 2 to 8.
2. The system as defined in the preceding point, wherein the driving cam and the driving lever are arranged so as to drive, instantaneously, the display mobile unit for displaying time or time derivative information.
3. The system as defined in one of the preceding points, wherein the coupling device comprises a gear linking the driving cam and the deactivation cam.
4. The system as defined in one of points 1 and 2, wherein the coupling device comprises a link securing, according to at least one degree of freedom, the driving cam to the deactivation cam, in particular an embedding connection or a rigid joint between the driving cam and the deactivation cam implemented by a stud.
5. The system as defined in one of the preceding points, wherein the system, in particular the driving lever, comprises a driving lever return spring.
6. The system as defined in one of the preceding points, wherein the driving device comprises a driving wheel and a one-way connection device linking the driving wheel and the driving cam.
7. The system as defined in one of the preceding points, wherein the driving device comprises a driving wheel and a mechanical connection linking the driving wheel and the driving cam, the mechanical connection having an angular play in rotation about an axis of rotation of the driving wheel and/or of the driving cam.
8. The system as defined in one of the preceding points, wherein the device for holding the mobile unit in position comprises a jumper comprising:
A horological calendar system according to the invention is defined by the following point 9.
9. A horological calendar system comprising:
A movement according to the invention is defined by the following point 10.
10. A horological movement comprising a driving and position-holding system as defined in one of points 1 to 8 and/or a horological calendar system as defined in the preceding point.
A timepiece according to the invention is defined by the following point 11.
11. A timepiece in particular a wristwatch, comprising a driving and position-holding system as defined in one of points 1 to 8 and/or a horological calendar system as defined in point 9 and/or a movement as defined in the preceding point.
An operating method according to the invention is defined by the following point 12.
12. A method for operating a driving and position-holding system as defined in one of points 1 to 8 and/or a horological calendar system as defined in point 9 and/or a movement as defined in point 10 and/or a timepiece as defined in point 11, the method comprising a step of instantaneous jump of the driving device comprising the following substeps:
Different embodiments of the method are defined by the following points 13 to 15.
13. The operating method as defined in the preceding point, wherein:
14. The operating method as defined in point 12 or 13, wherein the second substep of driving of the driving device is a substep of driving of at least two pitches of the mobile unit for displaying time or time derivative information.
15. The operating method as defined in one of points 12 to 14, wherein the substeps are implemented exclusively when the driving lever drives the driving cam and/or wherein the substeps are implemented instantaneously.
The attached drawings represent, by way of examples, two embodiments of a timepiece.
A first embodiment of a timepiece 120 is described hereinbelow with reference to
The timepiece 120 is, for example, a watch, in particular a wristwatch.
The timepiece 120 comprises a horological movement 110 intended to be mounted in a timepiece case in order to protect it from the outside environment.
The horological movement 110 can be an electronic movement or a mechanical movement, notably an automatic movement.
The horological movement 110 comprises a horological system 100, in particular a horological calendar system 100. The calendar system is, for example, a basic calendar system or an annual calendar system or a semi-perpetual calendar system or a perpetual calendar system.
The horological calendar system 100 comprises:
The time or time derivative information display mobile unit 50 can be a time or time derivative information display mobile unit of any type. In particular, the time or time derivative information display mobile unit can be:
In the embodiments represented, the mobile unit is a date display mobile unit.
The system 90 for driving and holding the mobile unit 50 in position comprises:
According to a more structural definition, the system 90 for driving and holding the mobile unit 50 in position comprises:
Thus, in this first embodiment, the driving device 80 comprises a driving wheel 11 and a one-way connection device 14, 15, 16, 17, 18 linking the driving wheel 11 and the driving cam 13.
The intermediate driving mobile unit 10 pivots about an axis A1.
The driving mobile unit 20 pivots about an axis A2 parallel or substantially parallel to the axis A1.
The elastic return of the driving lever 30 is ensured by the spring 30a. The spring 30a here forms part of the driving lever 30. Alternatively, they can be two distinct parts.
The mobile unit 50 can comprise a date display disk 50 pivoting about an axis A5 parallel or substantially parallel to the axis A1.
The jumper 40 can comprise:
The driving wheel 11 of the intermediate driving mobile unit 10 is constantly driven by an hours wheel of the base movement, not represented in the figures, so as to perform one revolution in 24 hours. This driving wheel 11 drives the first intermediate driving wheel 12 via the one-way connection device 14. More particularly, as illustrated by
The first intermediate driving wheel 12 is secured to the instantaneous jump cam 13 which, associated with the driving lever 30 and with its spring 30a, makes it possible to accumulate daily the energy necessary for the instantaneous date transition. For example, the instantaneous jump cam 13 is fixed to or mounted via a rigid joint on the first intermediate driving wheel 12. Notably, the instantaneous jump cam 13 can be driven onto the first intermediate driving wheel 12. A runner 31 mounted to pivot on the driving lever 30 ensures the cooperation between the latter and the instantaneous jump cam 13. The runner 31 makes it possible to reduce the friction between the driving lever 30 and the instantaneous jump cam 13, which makes it possible to thus reduce the energy consumption and the amplitude losses of the regulating member of the base movement. The spring 30a tends to hold this runner 31 against the instantaneous jump cam 13. The driving lever 30 comprises two ends that are each intended to be linked with a pivot link to a frame of the movement and is configured so as to be able to accumulate energy in the elastic part of the spring 30a. This lever configuration advantageously makes it possible to limit the mechanical stresses when the elastic part of the spring is armed while being able to be housed within a given footprint. Such a spring 30a arrangement is notably disclosed in the document WO2013102600.
The first intermediate driving wheel 12 drives, by its toothing, the second intermediate driving wheel 21 of the driving mobile unit 20. The second intermediate driving wheel 21 is secured to the jumper cam 22 and supports the driving member 23.
As illustrated in
The position-holding device 40 makes it possible to index the toothing 50a via the beak 42. The spring 40a is arranged so as to return the beak 42 into the toothing 50a. The respective configurations of the beak 42 and of the toothing 50a, and the arming level of the spring 40a, define a determined torque about the axis A5 of the mobile unit or disk 50. This torque is determined so as to hold the disk 50 in position, in particular upon an impact of predefined intensity. Obviously, the higher the arming of the spring 40a, and this independently of the respective configurations of the beak 42 and of the toothing 50a, the greater this torque will be, which directly impacts the energy consumption of the movement and thus the chronometric performance of said movement.
Advantageously, the arming level of the spring 40a is, here, controlled by the activation and deactivation device 70 of the position-holding device 40. In concrete terms, the cooperation of the runner 41 with the profile of the jumper cam 22 makes it possible to modulate the arming of the spring 40a as a function notably of the geometry and of the angular position of the outer profile of this jumper cam 22. Advantageously, the angular position thereof is linked to the angular position of the instantaneous jump cam 13, via the mechanical coupling device 12, 21. Thus, with such a system for driving and holding the mobile unit 50 in position, the arming level of the spring 40a, and by extension the torque that it produces, can be controlled or modulated in synchronism with the driving of the mobile unit 50.
The instantaneous jump cam 13 comprises an arming profile 13a, an instantaneous jump profile 13b, and a stop profile 13c that are intended to cooperate successively with the runner 31 of the driving lever 30, as illustrated in
As mentioned previously, the jumper cam 22 is kinematically linked to the instantaneous jump cam 13 via first and second intermediate driving wheels 12, 21. This jumper cam 22 comprises an outer profile 22a, a disarming profile 22b, an inner profile 22c and an arming profile 22d that are intended to cooperate successively with the runner 41 arranged at one of the ends of the spring 40a of the jumper 40. As for the runner 31 cooperating with the instantaneous jump cam 13, the runner 41 makes it possible to reduce the friction on contact with the jumper cam 22. Throughout the arming step in which the instantaneous jump cam 13 is driven by the driving wheel 11 and in which the runner 31 of the driving lever 30 is on the arming profile 13a of the instantaneous jump cam 13, the runner 41 of the jumper 40 is located exclusively on the outer profile 22a. This outer profile 22a is concentric to the axis A2 and is configured so as to keep the spring 40a armed in order to offer a nominal torque for indexing or holding the mobile unit 50 in position.
The arming step ends when the runner 31 arrives at the end of the arming profile 13a which is adjacent to the instantaneous jump profile 13b. This end is called “cam summit”. Thus, the instant at which the runner arrives at the “cam summit” marks the stopping of the arming step and the beginning of the instantaneous jump step. It is thus an instant of transition between the arming and instantaneous jump steps.
During this instantaneous jump step, all of the energy necessary for the date transition, stored up by the spring 30a of the energy accumulation device, is restored for the instantaneous driving of the mobile unit 50. In other words, in the instantaneous jump step, the instantaneous jump cam 13 becomes a driver through the restoration of the energy accumulated by the spring 30a. More particularly, in the instantaneous jump step, the driving cam 13 is driven by the driving lever 30 under the effect of the spring 30a. The driving cam 13 then drives the first and second intermediate driving wheels 12, 21, then the driving member 23 which, in turn, drives the toothing 50a for the date transition. In the instantaneous jump step, the one-way connection device 14 makes it possible to decouple from the base movement all of the downstream chain of said device in order for the instantaneous jump cam 13 to be able to be a driver. The angular travel then performed by the driving member 23 has an angle defined by the geometry of the instantaneous jump cam 13 and corresponds to the lead necessary for the driving of the toothing 50a.
During this instantaneous jump step, the jumper 40 is disarmed just before the driving of the mobile unit 50 and is immediately rearmed before the end of this step, which makes it possible to reduce the energy consumption necessary for the date transition, without compromising the indexing of the mobile unit 50.
More particularly, the instantaneous jump step comprises several successive substeps or steps which are detailed hereinbelow.
The instantaneous jump step comprises, first of all, a first substep of approach in which the runner 31 begins to travel on the instantaneous jump profile 13b of the instantaneous jump cam 13 from the “cam summit”. During this first approach substep, the driving member 23 is not yet in contact with the toothing 50a of the mobile unit 50. The mobile unit 50 is thus not yet driven. During this first approach substep, the jumper 40 is disarmed in order to reduce the torque that it produces and, consequently, the energy necessary for the driving of the mobile unit 50 during a second driving substep which will be described later. During this first approach substep, the runner 41 thus travels along the disarming profile 22b to arrive at the inner profile 22c of the jumper cam 22. This inner profile 22c corresponds to the minimum arming level of the jumper 40. This minimum arming level makes it possible to define a reduced torque for indexing or holding the mobile unit in position that is particularly advantageous for the second driving substep. The end of the first approach substep is illustrated in
In a second driving substep, the driving member 23 drives the toothing 50a. The driving is done in optimal conditions in energy terms because the jumper 40 has been previously disarmed in the first approach substep. Preferentially, the jumper is disarmed until the instant when the beak 42 of the jumper 40 has arrived or substantially arrived at the summit of the toothing 50a. This configuration is illustrated in
A third, stopping substep consists in completing the lead of the toothing 50a and in stopping the mobile unit 50. In this third, stopping substep, the beak 42 descends along the toothing 50a, under the effect of the restoration of the deformation energy of the spring 40a so as to contribute to the driving of the mobile unit 50 to its final position. This thus minimizes the energy required for the driving thereof. In this third, stopping substep, in which the energy required for the driving of the disk is less, the jumper 40 is rearmed. To do this, the runner 41 travels along the arming profile 22d of the jumper cam 22 to arrive on the outer profile 22a, thus defining a configuration in which the spring 40a is fully armed, as is illustrated in
The third, stopping substep ends when the runner 31 enters into contact with the stop profile 13c. Preferentially, at this instant, the driving member 23 is still positioned in the path of the toothing 50a. The driving member 23 thus serves as end-of-travel abutment of the mobile unit 50 in order to avoid the latter from being able to possibly make an unwanted jump because of its inertia and the considerable energy which is released in the instantaneous jump step. Because of this, the positioning torque of the driving mobile unit 20 induced by the stop profile 13c must be sufficiently great to retain the mobile unit 50 at the end of the date transition.
Thus, at the end of the instantaneous jump step, in particular at the end of the third, stopping substep, when the runner 31 is located on the stop profile 13c, the driving member 23 is still positioned in the path of the toothing 50a.
To sum up, each period of 24 hours comprises an arming step and an instantaneous jump step. The instantaneous jump step is itself composed of a first, approach substep, followed by a second, driving substep which is itself followed by a third, stopping substep. In other words, the instantaneous jump step corresponds to the succession of said first, second and third substeps.
As described previously, the chain downstream of the one-way connection device 14 is decoupled from the driving wheel 11 during the instantaneous jump step. The result thereof is that, after the date transition, the driving wheel 11 with its one-way connection device 14 catches the stud 18, secured to the first intermediate driving wheel 12 and the instantaneous jump cam 13, to be able to begin to rearm the energy accumulation device and thus begin a new arming step. This catching will last for the time it takes for the one-way connection device 14 to travel the angular extent defined by the geometry of the instantaneous jump cam 13, which is configured so as to allow a suitable lead of the mobile unit 50.
The arming step extends here over a duration significantly greater than that corresponding to the instantaneous jump step, the arming step extending over a duration of one or more hours while the instantaneous jump step, in particular all the substeps of which it is composed, extends over a duration of the order of a few fractions of a second.
As described previously, the position-holding device 40 can thus be actuated according to different substeps by the activation and deactivation device 70. A fourth substep of deactivation of the position-holding device 40 by the activation and deactivation device 70 is applied during the instantaneous jump step of the driving device 80, more particularly during the first, approach substep of the driving device 80. A fifth substep of activation of the position-holding device 40 by the activation and deactivation device 70 is also applied during the instantaneous jump step of the driving device 80, more particularly during the third substep of stopping of the driving device 80.
The driving and position-holding system 90 thus allows the following operating steps:
A second embodiment of a timepiece 120′ is described hereinbelow with reference to
The timepiece 120′ is, for example, a watch, in particular a wristwatch.
The timepiece 120′ comprises a horological movement 110′ intended to be mounted in a timepiece case in order to protect it from the outside environment.
The horological movement 110′ can be an electronic movement or a mechanical movement, notably an automatic movement.
The horological movement 110′ comprises a horological system 100′, in particular a horological calendar system 100′. The calendar system is, for example, a basic date system or an annular calendar system or a semi-perpetual calendar system or a perpetual calendar system.
The horological calendar system 100′ comprises:
The time or time derivative information display mobile unit 50′ can be a time or time derivative information display mobile unit of any type. In particular, the time or time derivative information display mobile unit can be:
In the embodiments represented, the mobile unit is a date display mobile unit.
The system 90′ for driving and holding the mobile unit 50′ in position also comprises:
This second embodiment differs primarily or exclusively from the first embodiment in that:
More particularly, compared to the first embodiment, the second embodiment does not comprise an intermediate driving mobile unit 10 but a single driving mobile unit 20′ in which the jumper cam 22′ and the instantaneous jump cam 13′ are directly integral, without being linked by first and second intermediate driving wheels 12, 21.
Preferably, apart from these few modifications, all the rest of the system according to the second embodiment operates in the same way as the first embodiment, whether it be at the energy accumulation, or mobile unit driving and indexing level.
According to a more structural definition, the system 90′ for driving and holding the mobile unit 50′ in position comprises:
Thus, in this second embodiment, the driving device 80′ can comprise a driving wheel 11′ and a mechanical connection 11a′, 18′ linking the driving wheel 11′ and the driving cam 13′. Advantageously, the mechanical connection 11a′, 18′ allows a play in rotation, according to an angular range corresponding to the angular extent of the oblong cutout 11a′, about an axis A2′ of rotation of the driving wheel 11′ and/or of the driving cam 13′.
The elastic return of the driving lever 30′ is ensured by the spring 30a′. The spring 30a′ here forms part of the driving lever 30′. Alternatively, they can be two distinct parts.
The mobile unit 50′ can comprise a date display disk 50′ pivoting about an axis A5′ parallel or substantially parallel to the axis A2′.
The jumper 40′ can comprise:
The driving wheel 11′ of the driving mobile unit 20′ is constantly driven by an hours wheel of the base movement, not represented in the figures, so as to perform one revolution in 24 hours. This driving wheel 11′ does not, however, comprise a one-way connection device as on the intermediate driving mobile unit 10 of the first embodiment. Nevertheless, the chain positioned downstream of the driving wheel 11′ even so has a degree of freedom in rotation relative to said wheel 11′ by virtue of the arrangement of the oblong cutout 11a′ intended to cooperate with a stud 18′ secured to the jumper cam 22′, the instantaneous jump cam 13′ and the driving member 23′. The oblong cutout 11a′ follows a portion of a circle coaxial to the axis A2′ and allows the stud 18′, and the components which are secured to it, to travel at least an angular extent defined by the geometry of the instantaneous jump cam 13′. This angular extent is defined so as to allow a suitable lead of the driving member 23′ for the date transition. This degree of freedom therefore allows the driving member 23′ to be decoupled from the driving wheel 11′ and from the base movement in the instantaneous jump step.
As in the first embodiment, the driving lever 30′ and the jumper 40′ therefore cooperate respectively with the instantaneous jump cam 13′ and the jumper cam 22′ via their runner, respectively 31′ and 41′. As illustrated in detail in
In the arming step, the driving wheel 11′ drives, via the cooperation of the oblong cutout 11a′ and of the stud 18′, the jumper cam 22′, the instantaneous jump cam 13′ and the driving member 23′. As for the first embodiment, the runner 31′ of the driving lever 30′ is located, during this arming step, on the arming profile 13a′ of the instantaneous jump cam 13′, and the runner 41′ of the jumper 40′ is located on the outer profile 22a′ of the jumper cam 22′. The jumper 40′ is therefore armed optimally throughout this arming step.
As for the first embodiment, the arming step ends when the runner 31′ arrives at the end of the arming profile 13a′ which is adjacent to the instantaneous jump profile 13b′. That is the instant which marks the stopping of the arming step and the beginning of the instantaneous jump step. This position, at the “cam summit”, is illustrated in
As for the device of the first embodiment, the spring 40a′ of the jumper 40′ is disarmed in the first, approach substep of the instantaneous jump step of the driving device 80′ to reduce the energy consumption in the second, driving substep of the instantaneous jump step of the driving device 80′. The spring 40a′ is then rearmed in the third stop substep of the driving device 80′, in order for the spring 40a′ to be rearmed at the end of the instantaneous jump step of the driving device 80′.
After the date transition, the stud 18′ is caught by the oblong cutout 11a′ of the driving wheel 11′. This catching will last for the time it takes for the oblong cutout 11a′ to catch the angular extent travelled by the driving member 23′ necessary for the lead of the mobile unit 50′. Once the oblong cutout 11a′ is once again in contact with the stud 18′, the system will begin a new arming step and thus recommence accumulating energy by arming the spring 30a′ of the driving lever 30′ by virtue of the arming profile 13a′ of the instantaneous jump cam 13′.
As described previously and in a way similar to the position-holding device 40 of the first embodiment, the position-holding device 40′ can be actuated according to different substeps by the activation and deactivation device 70′. A fourth substep of deactivation of the position-holding device 40′ by the activation and deactivation device 70′ is applied in the instantaneous jump step of the driving device 80′, more particularly in the first substep of approach of the driving device 80′. A fifth substep of activation of the position-holding device 40′ by the activation and deactivation device 70′ is also applied in the instantaneous jump step of the driving device 80′, more particularly in the third substep of stopping of the driving device 80′.
The driving and position-holding system 90′ thus comprises the following operating steps:
Preferably, whatever the embodiment, the driving cam 13; 13′ and the driving lever 30; 30′ are arranged so as to drive, instantaneously, the time or time derivative information display mobile unit 50; 50′.
Preferably, whatever the embodiment, the coupling device comprises a link securing, according to at least one degree of freedom, the driving cam 13; 13′ to the deactivation cam 22; 22′.
According to the first embodiment, the coupling device advantageously comprises a gear 12, 21 linking the driving cam 13 and the deactivation cam 22.
According to the second embodiment, the coupling device advantageously comprises a stud or a pin 18′ linking the driving cam 13′ and the deactivation cam 22′. It is then an embedding connection or a rigid joint between the driving cam 13′ and the deactivation cam 22′.
Preferably, whatever the embodiment, the system, in particular the driving lever 30; 30′, comprises a driving lever return spring 30a; 30a′.
Preferably, whatever the embodiment, the device 40; 40′ for holding the mobile unit in position comprises a jumper 40; 40′ comprising:
When the activation and deactivation device 70; 70′ exerts an action or controls the body of the jumper 40b; 40b′ rather than the spring 40a; 40a′, the position of the jumper 40; 40′ can notably be modulated. Moreover the jumper 40; 40′ could basically be a rigid lever, without return spring, which would latch and unlatch the mobile unit 50; 50′ as a function of the position of the deactivation cam 22; 22′.
As illustrated previously, the jumper cam 22; 22′ and the instantaneous jump cam 13; 13′ can be directly secured to one another (notably by a rigid joint or an embedding connection) as in the second embodiment, or they can be linked kinematically by an intermediate gear train as in the first embodiment. Other link means could be arranged such as a chain of intermediate wheels, or a driving finger.
Whatever the embodiment, the jumper cam 22; 22′ could simultaneously control jumpers for, for example, several mobiles units or displays. In particular, it could comprise several distinct levels for the control of these multiple jumpers. Additionally or alternatively, the jumper cam 22; 22′ can be kinematically linked to other jumper cams.
In the embodiments described previously, a one-way connection device 14 and an oblong cutout 11a′ cooperating with a stud 18′ were arranged in order to be able to decouple the base movement from the instantaneous jump cam when the latter is a driving cam during the instantaneous jump step. Any other decoupling device that makes it possible to give the system a degree of freedom necessary for the instantaneous jump of a mobile unit could be arranged here, such as, for example, a portion of toothing missing on the driving wheel or another freewheel system.
In the embodiments described previously, a runner 41; 41′ is arranged at the end of the spring 40a; 40a′ of the jumper 40; 40′. The runner makes it possible to limit the friction with the jumper cam 22; 22′. However, this arrangement is not essential. The system could very well operate without this runner, by having one of the ends of the spring 40a; 40a′ directly bearing on the jumper cam 22; 22′.
Like the jumper 40; 40′, the driving lever 30; 30′ could also not have a runner 31; 31′ at its end.
The driving member 23; 23′ could also be simplified by having basically a single rigid finger or a single elastic finger to effect the lead of the mobile unit 50; 50′ and the stopping thereof.
The driving and position-holding system 90; 90′ could also be used in any other calendar system and/or in any other system necessitating an instantaneous transition of a function or of a display with an indexing and/or a maintaining of this function or of this display. It would for example be possible to shrewdly arrange this driving and position-holding system to drive a mobile unit displaying the hour of the current time.
The driving and position-holding system 90; 90′ described could also be transposed to a display system comprising another date display member such as, for example, a hand display. Moreover, the date display system could comprise several date display members, as is for example the case in a “large date” type system.
One embodiment of a method for operating the driving and position-holding system 90; 90′ as described previously and/or the horological calendar system 100; 100′ as described previously and/or the movement 110; 110′ as described previously and/or a timepiece 120; 120′ as described previously is described hereinbelow.
The operating method comprises a step of instantaneous jump of the driving device 80; 80′ comprising the following substeps:
More particularly, the instantaneous jump step of the driving device 80; 80′ comprises the following substeps:
In other words, the method makes it possible to drive the mobile unit 50; 50′ even though the position-holding device 40; 40′ is deactivated. Moreover, it makes it possible to reactivate the position-holding device 40; 40′ during the very instantaneous jump step of the mobile unit 50; 50′.
These different states are strung together as follows:
Alternatively,
By way of example,
The additional finger 24a is offset angularly with respect to the first member 24 of the driving member 23. In the instantaneous jump step, because of the angular offset between the first member 24 and the additional finger 24a, it is the additional finger 24a which first encounters one of the teeth of the planetary pinion 51a and displaces the display mobile 50 by one pitch, making it transition from 30 to 31 then, during the same instantaneous jump step, the first member 24 takes over and drives a tooth of the toothing 50a of the display mobile unit 50 by a second pitch, making it transition from 31 to 1. Thus, during the same instantaneous jump step, the display mobile unit 50 transitions from 30 to 1, therefore undergoing two second driving substeps.
As in the mechanism described in EP 1 596 261, the first member 24 and the additional finger 24a are both secured to the instantaneous jump cam 13 via, here, the coupling device 12, 21. Although arranged here on the same driving mobile unit 20, the first member 24 and the additional finger 24a could be arranged on two distinct driving mobile unit. More broadly, there could be as many driving mobiles units secured to the instantaneous jump cam 13 as driving members of the display mobile unit 50.
More preferably, the activation of the position-holding device 40; 40′, more particularly the switching of the position-holding device 40; 40′ to the activated state, is executed after a point of equilibrium of the position-holding device has been crossed, in particular after a summit of a tooth of the indexing toothing 50a; 50a′ has been crossed by the jumper beak 42; 42′.
As alternatives:
By virtue of the solutions described, it is possible to control the arming of a jumper indexing a mobile unit. This is made possible by the arrangement of a jumper cam linked kinematically to an instantaneous jump cam. The instantaneous jump cam, with its elastic lever, makes it possible to accumulate the energy necessary for the jump. As for the jumper cam, it is configured so as to disarm the jumper only during some substeps which make up the instantaneous jump step of the mobile unit or instantaneous jumps of the mobile unit, upon the restoration of the energy accumulated by the elastic lever cooperating with the instantaneous jump cam. Before and after the instantaneous jump step, the jumper thus operates conventionally, and does so with an optimal arming for the positioning and holding of the mobile in position. The arrangement of such a system therefore does not affect the user, for example in the fast correction of the date.
Furthermore, by virtue of its configuration, the instantaneous jump cam advantageously makes it possible to induce an energy consumption that is constant and distributed throughout the arming step, or at least during most of the arming step. Therefore, the advantage of obtaining a reduced energy consumption by virtue of the implementation of a jumper cam is aggregated with the advantage of best distributing this energy consumption throughout the arming step. The result thereof is therefore an optimized energy consumption that makes it possible to reduce the amplitude variations on the regulating member and therefore the negative impact on the chronometry.
Furthermore, the one-way connection device is arranged upstream of said cams. Advantageously, this device prevents the user from having the system in a configuration in which the jumper would be disarmed. It is therefore not possible to set this system in a configuration in which the jumper is disarmed other than during the instantaneous jump or jumps corresponding to the date transition.
Throughout this document, “indexing of a mobile unit” is understood to mean the definition of different stable positions of the mobile unit. These stable positions are defined by the device for holding the mobile unit in position. These stable positions are separated by a continuum of unstable intermediate positions. The driving device makes it possible to switch the mobile unit from one stable position to another, via a continuum of unstable intermediate positions. Between two stable positions or two indexed positions or two indexing positions, the mobile unit transitions transiently through a continuum of unstable intermediate positions.
The device for activating and deactivating the position-holding device makes it possible to activate or deactivate the mobile unit holding device. Preferably, throughout this document, it is considered that, most of the time (apart from some substeps in the instantaneous jump or jumps of the mobile unit), the position-holding device is activated or active, that is to say that it generates a nominal torque for indexing or holding the mobile unit in position. The activation and deactivation device then activates the position-holding device. Preferably, throughout this document, it is considered that, in some situations (in some substeps in the instantaneous jump or jumps of the mobile unit), the holding device is deactivated or inactive, that is to say that it does not generate torque for indexing or holding the mobile unit in position or, preferably, that it generates a reduced torque for indexing or holding the mobile unit in position. The reduced torque is lower than the nominal torque.
Preferably, throughout this document, “synchronizing the driving cam and the deactivation cam” is understood to mean that during each action of the driving device (driving phase), the device for position-holding is configured in a deactivated state, notably all the devices for position-holding are configured in a deactivated state, in case where several devices for position-holding are provided. As a consequence of the disclosed embodiments, the link securing, according to at least one degree of freedom, the driving cam 13; 13′ to the deactivation cam 22; 22′ is permanent.
Preferably, throughout this document, “instantaneous” is understood to mean a duration of the order of one or more fractions of a second.
Regarding the method for operating the driving and position-holding system 90; 90′ as described previously and/or the horological calendar system 100; 100′ as described previously and/or the movement 110; 110′ as described previously and/or a timepiece 120; 120′ as described previously, “simultaneous” is preferably used to qualify substeps which do not necessarily begin and/or end at the same instants but which at least partially overlap in time.
In other words, the operating method preferably comprises:
For example, the operating method can comprise the succession of the following substeps:
| Number | Date | Country | Kind |
|---|---|---|---|
| 20201888.3 | Oct 2020 | EP | regional |
