Bidirectional correction device and timepiece movement comprising such device

Abstract

The invention relates to a bidirectional correction device (21) for correcting at least two display units of a display device, comprising a correction mover (22) and a correction gear train (23) arranged to simultaneously correct at least two display units of the calendar display device and independent of a force transmission mechanism of the calendar display device, in this way, the synchronism between the at least two display units of the display device is maintained in the correction stage.

Description

Technical Field

[0001] The invention relates to a bidirectional correction device for a timepiece movement, which allows correction of at least two display units of a calendar display device. Background Art

[0002] Unidirectional correction mechanisms have been proposed which make it possible to correct, for example, a date display by means of a control member of the crown, push-button or corrector type. Typically, the correction mechanism comprises a gear train meshing or engaging with a running gear train of a timepiece movement. Examples of such mechanisms are disclosed in documents EP3333642, EP2945024, EP1043634 and CH703451.

[0003] When a calendar module is used, this is usually in order to be able to accommodate several different watch movements while allowing a complex calendar display, such as an annual or perpetual calendar and / or having other displays such as weekday, week number, month, year and / or moon phases.

[0004] However, depending on the engagement of the calendar display device with the watch movement, it is difficult to simultaneously correct a plurality of displays at any time of the day and in a bidirectional manner. Summary of the invention

[0005] The object of the invention is to propose a new configuration of a correction device allowing bidirectional correction of at least two display devices, one of which is a date display device, and which is compatible with calendar complications such as annual, perpetual or centennial calendars.

[0006] To this end, the subject of the present invention is a bidirectional correction device for at least two display units, one of which is a date display unit included in a calendar display device, the date display unit of the calendar display device including a correction movable member and a correction gear train permanently coupled to the correction movable member, which are configured to simultaneously correct the at least two display units of the calendar display device and are independent of a force transmission mechanism for periodically incrementing the at least two display units, so as to maintain synchronization between the at least two display units of the calendar display device during the correction phase.

[0007] Advantageously, according to the invention, the correction system does not act in the usual way on a force transmission mechanism coupled to a watch movement, but has its own kinematic chain, which acts on the calendar display device, so as to be able to adapt to a very wide variety of calendar display devices (including stacked calendar modules), in particular to a variety of complex calendar display functions. This also avoids loss of synchronization between the display units being corrected. In addition, the correction device according to the invention can therefore advantageously be integrated in a watch movement or installed in a calendar module that is installed on different types of watch movements to display the value of the calendar. Finally, the correction device allows the value of at least two display units to be increased and decreased simultaneously.

[0008] Therefore, another subject of the present invention is a watch movement, characterized in that the watch movement includes a bidirectional correction device for correcting a display device as described above, the watch movement includes a force transmission mechanism, the force transmission mechanism includes a date control finger, the date control finger is arranged to control the date wheel of the calendar display device so as to increase the date display unit by one unit every twenty-four hours; and the correction movable member of the bidirectional correction device is arranged to control the date wheel of the calendar display device independently of the force transmission mechanism so as not to interfere with the force transmission mechanism during the correction phase.

[0009] The present invention may also include one or more of the following optional features, taken alone or in combination.

[0010] The date control finger can be elastically arranged in the force transmission mechanism so that when the date wheel is moved by the correction moving member and the date control finger is located on the trajectory of the date wheel, the date control finger can be elastically retracted from the date wheel. This configuration makes it possible not to hinder the correction between 23:00 and 1:00 a.m. every day. Although this function is not necessary because correction is rarely performed during this period at night, it is proposed as an advantageous option of the present invention, for example to avoid desynchronization of the display unit, while also protecting other teeth that are in contact.

[0011] According to a specific variant, in which the calendar display device includes a day display unit as another display unit to be corrected, the force transmission mechanism may include a day control finger, which is arranged to control the day wheel of the calendar display device so as to increment at least one day display unit by one unit every twenty-four hours, and the correction gear train of the bidirectional correction device is configured to control the day wheel of the calendar display device independently of the force transmission mechanism so as not to interfere with the force transmission mechanism during the correction phase.

[0012] Advantageously, according to the invention, even in this particular variant of the calendar display device including a day display unit as another display unit to be corrected, the correction device does not act on a force transmission mechanism coupled to the watch movement as usual, but has its own kinematic chain that acts on the calendar display device, thereby being able to adapt to a very wide variety of calendar display devices. In addition, the correction device makes it possible to simultaneously increase and decrease the value of the day display unit and the value of the date display unit.

[0013] The day control finger can be elastically arranged in the force transmission mechanism so that when the day wheel is moved by the correction gear train and the day control finger is on the trajectory of the day wheel, the day control finger can be elastically retracted from the day wheel. This configuration allows unimpeded correction between 23:00 and 1:00 a.m. every day. Although this function is not essential, since, as mentioned above, correction is rarely performed during this period of the night, it is proposed as an advantageous option of the present invention.

[0014] According to a particular variant, in which the calendar display device comprises an annual, perpetual or centennial calendar mechanism comprising various display units, including another display unit to be corrected, the force transmission mechanism may comprise an end-of-month control wheel configured to control the end-of-month wheel of the calendar display device so as to increase the date display unit by at least one additional unit according to the number of days in the month. The correction gear train of the bidirectional correction device is configured to control the end-of-month wheel of the calendar display device independently of the force transmission mechanism so as not to interfere with the force transmission mechanism during the correction phase.

[0015] Advantageously, according to the invention, even in a particular variant in which such a calendar display device comprises a date display unit of the annual or perpetual calendar type, the correction system does not act, as is customary, on a force transmission mechanism coupled to the watch movement, but rather has its own kinematic chain acting on the calendar display device, making it possible to adapt to a wide variety of calendar display devices. Furthermore, the correction device makes it possible to increase or decrease the value of a date display unit of the annual, perpetual or centennial calendar type without causing it to lose synchronization.

[0016] The correction movable member may include an elastic force limiting mechanism so that when the torque applied to the correction movable member exceeds a predetermined value, the correction movement is elastically disconnected in both directions, so that the correction gear train cannot drive the month end wheel of the calendar display device, and the month end control wheel is engaged with the month end wheel of the calendar display device. This structure avoids damage to the watch movement by disconnecting the correction between midnight and three o'clock in the morning at the end of February, April, June, September and November. Although this function is not necessary (since the month end control wheel is engaged with the month end wheel of the calendar display device, the correction will encounter resistance and cannot be performed), because the correction is rarely performed during this period of the night, it is proposed as an advantageous option of the present invention to prevent the user from applying excessive force to the control member (such as the crown gear).

[0017] The bidirectional correction device may include a clutch mechanism for switching between a correction position and a disengaged position, wherein the correction device is coupled to a correction control member so as to bidirectionally correct the display device, and wherein the correction device is disengaged from the control member so as to prohibit any correction of the display device.

[0018] The correction device may comprise a cam-elastic element assembly which, in the disengaged position, allows the correction movable element to be in a predetermined rest position outside the track of the date wheel. The cam may, for example, be mounted on the correction movable element, while the elastic element is mounted on a fixed part of the watch movement and exerts a thrust on the outer contour of the cam so as to drive the correction movable element to its predetermined rest position in the disengaged position.

[0019] It can therefore be understood that in the disengaged position the corrector movable element is always in the same rest position, thereby providing equal displacements for example for increasing (first direction of movement) and decreasing (second direction of movement opposite to the first direction) the value of the calendar display unit.

[0020] Finally, a subject of the invention is a timepiece, characterised in that it comprises a timepiece movement as described above.

[0021] BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other characteristics and advantages of the invention will become more apparent from the following description given by way of non-limiting indication with reference to the accompanying drawings, in which:

[0023] - Figure 1 is a schematic diagram of an example of a timepiece according to the present invention;

[0024] - Figure 2 is a perspective view of a calendar module including an example of a correction device according to the present invention;

[0025] - Figure 3 is similar to Figure 2A view of the invention in which some components are removed to better understand the invention;

[0026] - Figure 4 is a perspective view of an example of a correction device according to the present invention;

[0027] - Figure 5 is a top perspective view of an end-of-month control wheel with superimposed elements of a correction gear train according to an example of the present invention;

[0028] - Figure 6 is a bottom perspective view of an end-of-month control wheel with a resilient control finger, superimposed with elements of a correction gear train according to an example of the present invention;

[0029] - Figure 7 is a bottom perspective view of an example of a correction movable member according to the present invention.

[0030] Detailed Description of the Invention

[0031] In different figures, identical or similar elements are provided with identical reference numerals, possibly with additional markings, so that the description of their structures and functions will not be systematically repeated.

[0032] In the following, the orientation is the orientation in the drawings. In particular, the terms "upper", "lower", "left", "right", "above", "below", "forward" and "backward" are generally understood relative to the direction of representation of the drawings. Thus, the term "horizontal" is understood as a direction parallel to the main part of the main plate of the watch movement, and the term "vertical" is understood as a direction perpendicular to the horizontal direction and parallel to the thickness of the main plate of the watch movement.

[0033] In this specification, in order to more clearly explain the present invention, the axes (A1, A2, etc.) are arbitrarily stated as the first axis, the second axis, etc. This is just a simple nomenclature used to distinguish and name different geometric elements. This nomenclature does not mean that one axis has priority over another axis, and these names can be easily interchanged without departing from the scope of this specification. This nomenclature also does not imply an order, that is, the use of the third axis does not require the first axis and / or the second axis to implement the present invention.

[0034] “Fixed parts” are all elements or components that are fixed relative to a given reference system (for example relative to a calendar module or a watch movement), that is, they are static relative to the baseplate of the calendar module (or the baseplate of the calendar module itself) or relative to the mainplate of the watch movement (or the mainplate of the watch movement itself).

[0035] "Bidirectional correction device 21" refers to all types of devices capable of adjusting at least two calendar display units simultaneously to increase their values ​​and decrease their values. This device is very advantageous because at certain correction moments, it may be faster to decrease the display values ​​of the day, day and month of the display device than to increase them.

[0036] According to the present invention, the bidirectional correction device 21 generally includes a clutch mechanism (not shown), which can reversibly switch between a correction position and a separation position, in which the correction position is coupled to the correction control member 4 so as to bidirectionally correct the display device 11, and in which the correction device 21 is decoupled from the control member 4, thereby prohibiting any correction of the display device 11.

[0037] As an example, the clutch mechanism used in the present invention is of the "tie rod-sliding gear-steering device (French renvoi)" type, as disclosed in the book "Théorie d'horlogerie" (Fédération desécoles technique (FET), published in July 2015, ISBN 2-940025-47-9) by Charles-André REYMONDIN et al., chapter 3.2.7, subtitled "le remontage et la mise à l'heure", or in the book "the theory of horology" (Fédération desécoles technique (FET), published in July 2015, ISBN 2-940025-49-5) by Charles-André REYMONDIN et al., chapter 3.2.7, subtitled "winding and setting the hands". The "tie rod-sliding gear-steering device" nomenclature of the clutch mechanism is taken from this chapter 3.2.7.

[0038] The correction control member 4 can be of different types, for example Figure 1 Shown are a stem extending from the crown (which may be the same stem used for correcting the time and winding the mechanism), a rotating bezel, two buttons (one for increasing the value of the display unit and the other for decreasing the value of the display unit), or a rotating case back.

[0039] The term “independent of the force transmission mechanism 5 ” in the present invention means that there is no direct coupling between the kinematic chain of the correction device 21 and the kinematic chain of the force transmission mechanism 5 , although both can respectively control, for example, the same date wheel 12 of the calendar display device 11 .

[0040] “Timepieces 2” refers to all types of time measuring instruments or timing instruments, such as table clocks, wall clocks, watches, etc.

[0041] “Watch movement 3” refers to any type of mechanism capable of keeping time, whether powered by mechanical energy (such as a barrel) or electrical energy (such as a battery).

[0042] "Calendar module 1" refers to a subassembly intended to be fixed to a watch movement 3 to add at least one additional calendar display function thereto. Calendar module 1 may include several components to realize calendar display functions from the simplest to the most complex, such as a simple date display, an annual calendar, a perpetual calendar or a centennial calendar, and / or have other display functions, such as a day of the week, a week number, a month, a year, a day or night or an am / pm display, and / or any type of moon phase display (a moon phase display from the northern or southern hemisphere perspective, or a simultaneous display of the moon phases from both the northern and southern hemisphere perspectives).

[0043] exist Figure 1 and Figure 2 In the example shown, the invention relates to a correction device 21 mounted in a calendar module 1 intended to be mounted on a watch movement 3 in a timepiece 2. Of course, the correction device 21 according to the invention can be applied more generally to any watch movement 3 without departing from the scope of the invention and is not limited to a calendar module 1. However, the following description of the invention will be based on a specific embodiment in which the correction device 21 is integrated in a calendar module 1.

[0044] exist Figure 2 and Figure 3 In the example shown, the calendar module 1 is coupled to an output shaft (not shown) of the watch movement 3 at the center of its base plate 7, for example preferably fixed to an output shaft fixed to the hour wheel. The output shaft (not shown) of the watch movement 3 is thus permanently coupled to the force transmission mechanism 5 to drive the calendar display device 11. Of course, other output shafts of the watch movement 3, located at the center or not at the center of the base plate 7, may also be chosen without departing from the scope of the present invention.

[0045] As will be explained below, calendar module 1 may also be coupled to the steering device of the clutch mechanism of watch movement 3 so as to be able to couple the correction of time display device 17 (generally the last notch engraved on crown wheel 4) with the correction of at least one display unit 16A, 16B, 16C, 16D, 16E of calendar display device 11 (generally the middle notch engraved from crown wheel 4). Alternatively or additionally, the correction of at least one of the display units 16A, 16B, 16C, 16D, 16E of calendar display device 11 may comprise a dedicated element mounted only in calendar module 1. In practice, within the scope of the invention, correction device 21 is able to maintain the synchronicity between the different display units 16A, 16B, 16C, 16D, 16E, without the risk of losing this synchronicity by correcting only one of the display units. Nevertheless, a specific corrector dedicated to a specific case may be provided.

[0046] As in Figure 1 As can be seen better in the example of FIG. 2 , the timepiece 2 includes a calendar display device 11 including a pointer-type date display unit 16A, a pointer-type month display unit 16B, a disk-type year display unit 16C, a pointer-type day of the week display unit 16D, and a disk-type moon phase display unit 16E. Figure 1 In the example shown, the timepiece 2 also comprises a pointer time display unit 17 (hours and minutes) mounted in a conventional manner on the timepiece movement 3. Of course, other types of display units other than those described above may be provided without departing from the scope of the invention, such as cylindrical, spherical, strip-shaped, annular, one or more pointers with indicating functions, or one or more disks, in a linear, continuous, discontinuous, intermittent or retrograde operating mode with semi-instantaneous or instantaneous jumps and / or in combination with these types of display units listed.

[0047] exist Figure 2-6 In the example shown, the force transmission mechanism 5 mainly comprises a reduction mechanism 8, a gear train 9, a date control finger 6A, a day control finger 6B and a month end control wheel 6C. The reduction mechanism 8 is formed by the inner teeth 8A of the month end control wheel 6C, which form an outer planetary gear and are permanently coupled with three planetary gears 8B pivotally mounted on the base plate 7. Preferably, the three planetary gears 8B are permanently coupled with the pinions of the central planetary wheels forming the output shaft (not shown) of the watch movement 3, which is fixedly connected to the hour wheel. The reduction mechanism 8 thus allows the month end control wheel 6C to rotate once every 24 hours around the first axis A1 at the center of the base plate 7 of the calendar module 1.

[0048] Therefore, the month end control wheel 6C is a mechanical element that distributes the force received from the timepiece movement 3 to the rest of the force transmission mechanism 5. Figure 2 , Figure 4 and Figure 6 In the example shown, the date control finger 6A is formed in the base plate of the wheel 9A of the gear train 9, which moves integrally with the end-of-month control wheel 6C. Figure 4 and Figure 6 As can be seen more clearly, wheels 9A and 6C are stacked one on top of the other. Date control finger 6A is temporarily coupled once a day to date wheel 12 of calendar display device 11, depending on its angle of rotation relative to first axis A1, to increase calendar display unit 16A by one unit every 24 hours during normal operation of the watch.

[0049] As in Figure 4 As shown more clearly in the example of FIG. 5 , the date control finger 6A is elastically arranged on the wheel 9A in the force transmission mechanism 5 so as to be able to retract elastically towards the first axis A1 when subjected to a stress exceeding a predetermined value. To this end, the date control finger 6A comprises a body 6A1 oriented substantially radially and is arranged in the wheel 9A by means of two flexible rods 6A2 located on either side of the body 6A1 and substantially perpendicular. In the rest position, the date control finger 6A protrudes from the periphery of the wheel 9A and is able to retract elastically towards the first axis A1 (by deformation of the rods 6A2) when it is subjected to a stress exceeding a predetermined value (this predetermined value is greater than the stress required to drive the date wheel 12 in normal operation). Preferably, the finger 6A (and therefore the body 6A1), the flexible rods 6A2 and the wheel 9A are made as a single component by additive manufacturing (3D printing, mold forming, etc.) or subtractive manufacturing (mechanical processing, chemical etching, etc.).

[0050] exist Figure 3 In the example shown, the month-end control wheel 6C includes peripheral teeth for temporarily coupling with the month-end wheel 13 of the calendar display device 11 at the end of February, April, June, September and November according to its rotation angle relative to the first axis A1, so as to selectively increase the date display unit 16A by at least one additional unit according to the number of days in the month.

[0051] exist Figure 2-6 In the example shown, the date display unit 16A is of the perpetual calendar type, i.e. two date units are added at the end of April, June, September and November, and four or three date units are added at the end of February, depending on whether the year is a leap year. It can therefore be understood why the calendar display device 11 is also able to manage the movement of the month display unit 16B and the year display unit 16C by coupling the date wheel 12 to a dedicated gear train, which will not be described in detail because it utilizes a reduction gear train with parameter settings known per se, which is based on the date wheel 12 rotating 360 degrees every month.

[0052] exist Figure 2-4In the example shown, similar to the date control finger 6A, the day control finger 6B is formed in the base plate of the wheel 9B of the gear train 9. The wheel 9B is permanently coupled to the end-of-month control wheel 6C by means of a deflection device 9C. The day control finger 6B is temporarily coupled to the day wheel 10 (at the end of the month) of the calendar display device 11 every day according to its rotation angle relative to the second axis A2. Figure 3-4 The calendar display device 11 is coupled once to the wheel 9B (a seven-tooth star wheel in the example) so that the day display unit 16D is increased by one unit every 24 hours. It can also be seen that the gear train 9 extends behind the wheel 9B so as to drive the moon phase display unit 16E by reducing the speed relative to the wheel 9B. It can therefore be understood why the calendar display device 11 is also able to manage the movement of the moon phase display unit 16E by coupling the wheel 9B with a dedicated gear train, which is not described in detail because the reduction gear train used by the dedicated gear train has a parameter setting known per se, which is based on the 360 ​​degree rotation of the wheel 9B per day.

[0053] As in Figure 3 and Figure 4 As more clearly shown in the example of FIG. 5 , similarly to the date control finger 6A, the day control finger 6B is elastically arranged on the wheel 9B in the force transmission mechanism 5 so as to be able to retract elastically towards the second axis A2 when subjected to a stress exceeding a predetermined value. To this end, the day control finger 6B comprises a body 6B1 oriented substantially radially and is arranged in the wheel 9B by means of four flexible rods 6B2 located on either side of the body 6B1 and substantially perpendicular. In the rest position, the day control finger 6B protrudes from the periphery of the wheel 9B and is able to retract elastically towards the second axis A2 (by deformation of the rods 6B2) when it is subjected to a stress exceeding a predetermined value (this predetermined value is greater than the stress required to drive the day star wheel 10 in normal operation). Preferably, the finger 6B (and therefore the body 6B1), the flexible rods 6B2 and the wheel 9B are made as a single component by additive manufacturing (three-dimensional printing, mold forming, etc.) or subtractive manufacturing (mechanical processing, chemical etching, etc.).

[0054] Advantageously, according to the invention, the calendar module 1 comprises a bidirectional correction device 21 for correcting at least two display units 16A, 16B, 16C, 16D, 16E of the display device 11, one of which is the date display unit 16A. Figure 4 and Figure 7 As can be seen in the example of , the bidirectional correction device 21 includes at least one correction movable member 22, which is arranged to control the date wheel 12 of the calendar display device 11 independently of the force transmission mechanism 5 so as not to interfere with the force transmission mechanism 5 during the correction phase.

[0055] exist Figure 4 and Figure 7In the example shown, the correction movable member 22 includes a correction finger 22A, which is formed in the first layer of the correction movable member 22 and is intended to be temporarily coupled with the date wheel 12 of the calendar display device 11 once every 360 degrees, depending on its rotation angle relative to the third axis A3, so as to correct the date display unit 16A in an increasing or decreasing manner without affecting the indexation of the force transmission mechanism 5 relative to the calendar display device 11.

[0056] In fact, advantageously, according to the invention, the correction device 21 does not act on the force transmission mechanism 5 coupled to the watch movement 3, as is usually the case, but has its own kinematic chain, which acts on the calendar display device 11, making it possible to adapt to a very wide variety of calendar modules 1, in particular to various complex calendar display functions. In addition, the same calendar module 1 can be mounted on different types of watch movements 3 to display calendar values. Finally, the correction device 21 can both increase and decrease the value of the date display unit 16A.

[0057] As described above, preferably, according to the present invention, the date control finger 6A can be elastically arranged in the force transmission mechanism 5 so that when the date wheel 12 is moved by the correction finger 22A of the correction movable member 22 and the date control finger 6A is located on the track of the date wheel 12, the date control finger 6A can be elastically retracted from the date wheel 12. This configuration makes it possible not to hinder the correction between 23:00 and 1:00 every day. Although this function is not necessary because correction is rarely performed during this period at night, it is proposed as an advantageous option of the present invention.

[0058] In addition, Figure 3-7 In the example shown, the bidirectional correction device 21 comprises a correction gear train 23 which is permanently coupled to the correction movable member 22 and is arranged to control the day wheel 10 of the calendar display device 11 independently of the force transmission mechanism 5 (in Figure 3-4 In the example of FIG. 1 , a seven-tooth star wheel is provided so that the force transmission mechanism 5 is not disturbed during the correction phase.

[0059] More specifically, the correction gear train 23 mainly includes a center wheel 23A and an end wheel 23B, and the end wheel 23B is connected to a pinion 22C formed in the third layer of the correction movable member 22 through an intermediate steering device. Figure 3-4 In the example shown, a deflection device is provided between pinion 22C and center wheel 23A, and center wheel 23A is also coupled to end wheel 23B via another deflection device. However, this configuration of wheel train 23 can be adapted to the architecture of calendar module 1 or watch movement 3 without departing from the scope of the present invention.

[0060] exist Figure 3-4In the example shown, the end wheel 23B includes a pin 23B1 formed thickly, and the pin 23B1 is intended to be aligned with the day wheel 10 ( Figure 3-4 1) is temporarily coupled once to the force transmission mechanism 5 (a seven-tooth star wheel in the example of FIG. 5 ) in order to correct the day display unit 16D (at least simultaneously with the date display unit 16A) in an increasing or decreasing manner without affecting the graduation of the force transmission mechanism 5 relative to the calendar display device 11. Advantageously, according to the invention, the correction device 21 does not act in the usual way on the force transmission mechanism 5 coupled to the watch movement 3, but has its own kinematic chain that acts on the calendar display device 11 to increase or decrease the value of the day display unit 16D and the value of each of the other display units 16E (moon phases) connected to the day display unit 16D, without losing their synchronization.

[0061] As described above, preferably, according to the present invention, the day control finger 6B is elastically arranged in the force transmission mechanism 5 so that when the day wheel 10 is moved by the correction gear train 23 and the day control finger 6B is located on the trajectory of the day wheel 10, the day control finger 6B can be elastically retracted from the day wheel 10. Similar to the date control finger 6A, this configuration of the day control finger 6B makes it possible not to hinder the correction between 23:00 and 1:00 every day. Although this function is not necessary because correction is rarely performed during this period at night, it is proposed as an advantageous option of the present invention.

[0062] exist Figure 2-6 In the case of the example shown, which comprises a date display unit 16A of the perpetual calendar type, the bidirectional correction device 21 controls the end-of-month wheel 13 of the calendar display device 11 independently of the force transmission mechanism 5 by means of the central wheel 23A of the correction gear train 23, so as not to disturb the force transmission mechanism 5 during the correction phase. Advantageously, according to the invention, even in this particular variant of the calendar module 1 comprising a perpetual calendar display unit 16A, the correction system 21 does not act in the usual way on the force transmission mechanism 5 coupled to the watch movement 3, but has its own kinematic chain that acts on the calendar display device 11, making it possible to adapt to a wide variety of calendar modules 1. Furthermore, the correction device 21 can both increase and decrease the value of the date display unit 16A, as well as the values ​​of the other display units 16B (month), 16C (year) associated with the perpetual calendar mechanism, without losing their synchronization.

[0063] According to an optional function, the correction movable member 22 may include an elastic force limiting mechanism 25 so that when the torque applied to the correction movable member 22 exceeds a predetermined value, the correction movement is elastically separated in both directions, so that in particular the correction gear train 23 cannot drive the end-of-month wheel 13 of the calendar display device 11, while the end-of-month control wheel 6C is engaged with the end-of-month wheel 13 of the calendar display device 11. This construction allows the correction to be disengaged between midnight and three o'clock in the morning at the end of the month in February, April, June, September and November, thereby avoiding damage to the watch movement 3. Although this function is not necessary (since the end-of-month control wheel 6C is engaged with the end-of-month wheel 13 of the calendar display device 11, the correction will not be carried out due to resistance), because the correction is rarely performed during this period of the night, it is proposed as an advantageous option of the present invention to prevent the user from controlling the control member 4 (for example Figure 1 Excessive forces are applied to the crown gear in the example above.

[0064] More specifically, in Figure 7 In the example shown, the elastic force limiting mechanism 25 includes a groove 22D on the fourth outer periphery of the correction movable member 22 and a wheel 24 that cooperates with the groove 22D. The wheel 24 includes an outer peripheral gear ring 24A, which is used to receive the correction control member 4 (for example) when the correction device 21 is in the engaged position. Figure 1 Wheel 24 comprises elastic elements 24b distributed on its inner diameter, the ends of which are arranged to be in contact with groove 22D.

[0065] exist Figure 7 In the example of , the elastic element 24b is symmetrically distributed around the third axis A3 in the form of four Y-shaped parts. When the applied torque is lower than a predetermined value, the wheel 24 is elastically in a stable position and rotates integrally with the groove 22D. When the applied torque exceeds a predetermined value, the wheel 24 is elastically decoupled and can no longer transmit force to the groove 22D, and the wheel 24 rotates around the third axis A3. Finally, once the stress is released so that the torque is lower than the predetermined value again, the elastic element 24b returns to a stable elastic position against the groove 22D, so that the wheel 24 rotates integrally with the groove 22D again.

[0066] Preferably, the predetermined value of the disengagement torque of the elastic force-limiting mechanism 25 is the same for each direction of rotation about the third axis A3, taking into account the force applied by the user on the control member 4, and is generally between 3 and 5 Nmm, typically substantially equal to 4 Nmm (this value is greater than the stress required to drive the date wheel 12, the end of the month wheel 13 and the day of the week wheel 10 in normal correction operation, and is also greater than the force required to elastically retract the control fingers 6A, 6B). However, of course, by adjusting the shape of the elastic element 24b, the predetermined value of the disengagement torque may be different depending on the direction of rotation about the third axis A3, and / or each predetermined value of the disengagement torque may be greater than or less than 4 Nmm without departing from the scope of the present invention.

[0067] Finally, the correction device 21 may optionally include an assembly of a cam 22b and an elastic element 26, so that when the bidirectional correction device 21 is in the separated position, the correction movable member 22 is in a predetermined static position outside the track of the date wheel 12. It is therefore understood that, in the separated position, the correction movable member 22 is always in the same static position, thereby providing, for example, equal displacements for increasing (a first direction of movement) and decreasing (a second direction of movement opposite to the first direction) the values ​​of the calendar display units 16A, 16B, 16C, 16D, 16E. Figure 3 and Figure 4 In the example shown, the cam 22b is installed in the second layer of the correction movable member 22. In addition, an elastic element 26 is installed in the fixed part of the calendar module 1 (fixed on the base plate 7 by screws) and applies a thrust to the outer contour of the cam 22B. The shape of the elastic element 26 in contact with the cam 22B and the shape of the cam 22B are designed to drive the correction movable member 22 to its predetermined static position when the bidirectional correction device 21 is in the separated position.

[0068] The present invention is not limited to the described embodiments and variations, and other embodiments and variations will be apparent to those skilled in the art. Therefore, the above embodiments are merely examples. More complex or simpler display modes may be considered without departing from the scope of the present invention.

[0069] Furthermore, as mentioned above, correction device 21 is not limited to being installed in calendar module 1. Correction device 21 may therefore be installed more generally in timepiece movement 3 without departing from the scope of the present invention.

Claims

1. A bidirectional correction device (21) for correcting at least two display units (16A, 16B, 16C, 16D, 16E) of a calendar display device (11), one of the display units being a date display unit (16A), the bidirectional correction device comprising a correction movable member (22) and a correction gear train (23) permanently coupled to the correction movable member (22), which are arranged to simultaneously correct the at least two display units (16A, 16B, 16C, 16D, 16E) of the calendar display device (11) and are independent of a force transmission mechanism (5) for periodically incrementing the at least two display units (16A, 16B, 16C, 16D, 16E) so as to maintain synchronization between the at least two display units (16A, 16B, 16C, 16D, 16E) of the calendar display device (11) during the correction phase.

2. A watch movement (3), characterized in that: It comprises a bidirectional correction device (21) for correcting a display device (11) according to claim 1, the watch movement (3) comprising a force transmission mechanism (5), the force transmission mechanism (5) comprising a date control finger (6A), the date control finger (6A) being arranged to control the date wheel (12) of the calendar display device (11) so as to increment the date display unit (16A) by one unit every 24 hours, and wherein the correction movable member (22) of the bidirectional correction device (21) is arranged to control the date wheel (12) of the calendar display device (11) independently of the force transmission mechanism (5) so as not to interfere with the force transmission mechanism (5) during the correction phase.

3. A timepiece movement (3) according to the preceding claim, wherein: The date control finger (6A) is elastically arranged in the force transmission mechanism (5) so that when the date wheel (12) is moved by the correction movable member (22), if the date control finger (6A) is located on the track of the date wheel (12), the date control finger (6A) can be elastically retracted from the date wheel (12).

4. A watch movement (3) according to claim 2 or 3, wherein the force transmission mechanism (5) includes a day control finger (6B), which is arranged to control the day wheel (10) of the calendar display device (11) so as to increase at least one day display unit (16D) by one unit every 24 hours, and the correction gear train (23) of the bidirectional correction device (21) is configured to control the day wheel (10) of the calendar display device (11) independently of the force transmission mechanism (5) so as not to interfere with the force transmission mechanism (5) during the correction phase.

5. A watch movement (3) according to the preceding claim, wherein the day-of-week control finger (6B) is elastically arranged in the force transmission mechanism (5) so that when the day-of-week wheel (10) is moved by the correction gear train (23), if the day-of-week control finger (6B) is located on the trajectory of the day-of-week wheel (10), the day-of-week control finger (6B) can be elastically retracted from the day-of-week wheel (10).

6. A watch movement (3) according to any one of claims 2 to 5, wherein the force transmission mechanism (5) includes an end-of-month control wheel (6C), which is configured to control the end-of-month wheel (13) of the calendar display device (11) to selectively increase the date display unit (16A) by at least one additional unit according to the number of days in the month, and the correction gear train (23) of the bidirectional correction device (21) is configured to control the end-of-month wheel (13) of the calendar display device (11) independently of the force transmission mechanism (5) so as not to interfere with the force transmission mechanism (5) during the correction phase.

7. A watch movement (3) according to the preceding claim, wherein the correction movable member (22) includes an elastic force limiting mechanism (25) so that when the torque applied to the correction movable member (22) exceeds a predetermined value, the correction movement is elastically disconnected in both directions, so that the correction gear train (23) cannot drive the end-of-month wheel (13) of the calendar display device (11), and the end-of-month control wheel (6C) is engaged with the end-of-month wheel (13) of the calendar display device (11).

8. A watch movement (3) according to any one of claims 2 to 7, wherein the bidirectional correction device (21) includes a clutch mechanism for switching between a correction position and a separation position, wherein in the correction position, the correction device (21) is coupled to a correction control member (4) so ​​as to bidirectionally correct the display device (11), and in the separation position, the correction device (21) is separated from the control member (4) so ​​as to prohibit any correction of the display device (11).

9. A watch movement (3) according to the preceding claim, wherein the correction device (21) comprises a cam (22B)-elastic element (26) assembly which allows, in the disengaged position, the correction movable member (22) to be in a predetermined stationary position outside the trajectory of the date wheel (12).

10. A watch movement (3) according to the preceding claim, wherein the cam (22B) is mounted on the correction movable member (22), and the elastic element (26) is mounted on the fixed part (7) of the watch movement (3), and the elastic element (26) applies a thrust to the outer contour of the cam (22B) so as to drive the correction movable member (22) to its predetermined static position in the separation position.

11. A timepiece (2), characterized in that: The timepiece (2) comprises a timepiece movement (3) according to any one of claims 2 to 10.

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