WO2024046724A1

WO2024046724A1 - Bidirectional correction device and timepiece movement comprising such a device

Info

Publication number: WO2024046724A1
Application number: PCT/EP2023/071974
Authority: WO
Inventors: Samuel VUILLEMEZ
Original assignee: Richemont International Sa
Priority date: 2022-08-29
Filing date: 2023-08-08
Publication date: 2024-03-07

Abstract

The invention relates to a device (21) for the bidirectional correction of at least two displays of a display device having a correction wheel (22) and a correction gear train (23) arranged to simultaneously correct the at least two displays of a calendar display device independently with respect to a force transmission mechanism of the at least two displays in order to preserve the synchronisation of the at least two displays of the display device during the correction phases.

Description

BIDIRECTIONAL CORRECTION DEVICE AND WATCH MOVEMENT COMPRISING SUCH A DEVICE

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a bidirectional correction device for a watch movement allowing the correction of at least two displays of a calendar display device.

TECHNICAL BACKGROUND OF THE INVENTION

[0002] Unidirectional correction mechanisms have already been proposed making it possible to correct, for example, the date display using a crown, pusher or corrector type control member. In general, correction mechanisms include a train that meshes or engages with the finishing train of the watch movement. Examples of such mechanisms are disclosed in documents EP 3 333 642, EP 2 945 024, EP 1 043 634 and CH 703 451.

[0003] When a calendar module is used, it is generally in order to be able to adapt to several different watch movements while allowing a sophisticated calendar display such as an annual or perpetual calendar and/or with other displays such as day of the week, week number, month, year and/or moon phase.

[0004] However, depending on the meshing of the calendar displays with the watch movement, it is difficult to correct several displays at the same time, at any time of the day and in a bidirectional manner.

SUMMARY OF THE INVENTION

[0005] The aim of the invention is to propose a new configuration of correction device allowing the bidirectional correction of at least two displays including a date display and being compatible with calendar complications such as the annual, perpetual or secular calendar.

[0006] To this end, the subject of the invention is a device for bidirectional correction of at least two displays including a date display of a calendar display device comprising a correction wheel and a correction gear coupled in permanence to the correction mobile arranged to correct at the same time said at least two displays of the calendar display device independently with respect to a force transmission mechanism of said at least two displays intended to increment them periodically in order to maintain synchronization between said at least two displays of the calendar display device during the correction phases. [0007] Advantageously according to the invention, the correction system does not act on the force transmission mechanism coupled to the watch movement in the usual manner but has its own kinematic chain acting on the calendar display device in order to be able to adapt to a very wide variety of calendar display devices (including stacked calendar modules) and including a wide variety of calendar display complications. This also ensures that the corrected displays are not desynchronized with each other. Furthermore, the correction device according to the invention can thus be advantageously installed in a watch movement or in a calendar module intended to be mounted on different types of watch movements to display calendar values. Finally, the correction device makes it possible to both increase and decrease the values of at least two displays at the same time.

[0008] The invention therefore also relates to a watch movement characterized in that it comprises a device for bidirectional correction of the display device as presented above, the watch movement comprising a force transmission mechanism comprising a finger date control device arranged to control a date wheel of a calendar display device to increment the date display by one unit every twenty-four hours, and in that the correction mobile of the correction device bidirectional is arranged to control the date wheel of the calendar display device independently of the force transmission mechanism so as not to disturb the latter during the correction phases.

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

[0010] The date control finger can be arranged elastically in the force transmission mechanism so as to be able to elastically retract from the date wheel when the latter is moved by the correction wheel while the date control finger date is on the path of the date wheel. This configuration ensures that the correction is not prevented between 11 p.m. and 1 a.m. each day. Although this function is not essential because it is rare for corrections to be made at this time of the night, it is proposed as an advantageous option of the invention, to avoid, for example, desynchronization of the displays and also to protect the other teeth in contact.

[0011] According to a particular variant in which the calendar display device comprises a day of the week display as another corrected display, the force transmission mechanism may comprise a day control finger arranged to control a day wheel of the calendar display device for increment by one unit at least one day display every twenty-four hours, the correction gear of the bidirectional correction device being arranged to control the day wheel of the calendar display device independently of the transmission mechanism of force so as not to disturb the latter during the correction phases.

Advantageously according to the invention, even in this particular variant in which the calendar display device comprises a day of the week display as another corrected display, the correction device does not act on the transmission mechanism of force coupled to the watch movement in the usual way but has its own kinematic chain acting on the calendar display device in order to be able to adapt to a very wide variety of calendar display devices. In addition, the correction device makes it possible to increase or decrease the value of the day of the week display at the same time as that of the date display.

[0013] The day control finger can be arranged elastically in the force transmission mechanism so as to be able to elastically retract from the day wheel when the latter is moved by the correction gear while the day control finger day is on the path of the day wheel. This configuration ensures that the correction is not prevented between 11 p.m. and 1 a.m. each day. Although this function is not essential because, as mentioned above, it is rare for corrections to be made at this time of the night, it is offered as an advantageous option of the invention.

[0014] According to a particular variant in which the calendar display device comprises an annual, perpetual or secular calendar mechanism, which comprise various displays including the other corrected display, the force transmission mechanism may comprise a wheel end of month control arranged to control an end of month wheel of the calendar display device to increment the date display by at least one additional unit as a function of the number of days in the month, the correction gear of the bidirectional correction device being arranged to control the end of month wheel of the calendar display device independently of the force transmission mechanism so as not to disturb the latter during the correction phases.

Advantageously according to the invention, even in this particular variant in which the calendar display device comprises a date display of the annual or perpetual type, the correction system does not act on the force transmission mechanism coupled to the watch movement in the usual way but has its own kinematic chain acting on the display device calendar to accommodate a wide variety of calendar display devices. In addition, the correction device makes it possible to both increase and decrease the value of the date display of the annual, perpetual, or secular type without desynchronizing it.

[0016] The correction wheel may include an elastic force limiting mechanism so as to elastically disengage the correction movement in a bidirectional manner above a predetermined torque applied to the correction wheel so that the correction gear does not does not drive the end-of-month wheel of the calendar display device while the end-of-month control wheel is meshed with the end-of-month wheel of the calendar display device. This configuration avoids damage to the watch movement by allowing the correction to be disengaged between midnight and three o'clock at the end of the month of February, April, June, September and November. Although this function is not essential (correction is not possible because there is resistance to correction due to the end of month control wheel which is meshed with the end of month wheel of the month display device). calendar) because it is rare that corrections are made at this time of the night, it is proposed as an advantageous option of the invention which discourages the user from forcing on the control member such as a crown.

[0017] The bidirectional correction device may include a clutch mechanism making it possible to pass between a correction position in which the correction device is coupled to a correction control member in order to correct the display device in a bidirectional manner, and a disengaged position in which the correction device is decoupled from the control member in order to prevent any correction of the display device.

[0018] The correction device may comprise a cam - elastic element assembly allowing, in the disengaged position, the correction wheel to be in a predetermined rest position outside the trajectory of the date wheel. The cam can for example be mounted on the correction mobile and the elastic element, mounted on a fixed part of the watch movement, and exerts a pushing force against an external profile of the cam capable of driving, in the disengaged position, the mobile correction in its predetermined rest position.

[0019] We thus understand that in the disengaged position, the correction mobile is always in the same rest position to allow, for example, to provide an equivalent displacement for the increase (first direction of movement) as the decrease ( second direction of movement opposite to the first direction) of the value of the calendar display. [0020] Finally, the subject of the invention is a timepiece characterized in that it comprises a watch movement as presented above.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other particularities and advantages of the invention will emerge clearly from the description given below, for information only and in no way limiting, with reference to the appended drawings, in which: Figure 1 is a schematic view of an example of a timepiece according to the invention; Figure 2 is a perspective view of a calendar module comprising an example of a correction device according to the invention; Figure 3 is a view similar to Figure 2 in which elements have been removed for a better understanding of the invention; Figure 4 is a perspective view of the example of correction device according to the invention; Figure 5 is a top perspective view of an end-of-month control wheel superimposed on an element of an example of correction gear according to the invention; Figure 6 is a perspective view from below of an end-of-month control wheel with an elastic control finger superimposed on an element of the example of correction cog according to the invention; Figure 7 is a bottom perspective view of an example of a correction mobile according to the invention.

DETAILED DESCRIPTION OF AT LEAST ONE MODE OF CARRYING OUT THE INVENTION

[0022] In the different figures, the identical or similar elements bear the same references, possibly added with an index. The description of their structure and function is therefore not systematically included.

[0023] In everything that follows, the orientations are the orientations of the figures. In particular, the terms "upper", "lower", "left", "right", "above", "below", "forward" and "backward" generally mean in relation to the meaning of representation of the figures. The term "horizontal" is therefore understood as a direction parallel to the main section of the 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 plate of the watch movement. watch movement.

[0024] In the present description, to clarify the explanation of the invention, the axes (A1, A2, etc.) are arbitrarily declared as a first axis, a second axis, etc. It is a simple nomenclature to differentiate and name non-identical geometric elements. This nomenclature does not imply a priority of one axis over another and one can easily interchange such designations without departing from the scope of this description. This nomenclature does not imply an order either, that is to say that a third axis could be used without a first axis and/or a second axis being necessary for the implementation of the invention.

[0025] By “fixed part”, we mean all the elements or bodies fixed in relation to the given frame of reference such as for example in relation to the calendar module or the watch movement, that is to say static in relation to the board of the calendar module (or the board itself of the calendar module) or static in relation to the plate of the watch movement (or the plate itself of the watch movement).

By “bidirectional correction device 21” is meant all types of devices capable of modifying at least two calendar displays at the same time both to increase their value and to decrease their value. This device is very advantageous because, depending on the moment of the correction, it can be quicker to reduce the days, date and month of the display device than the reverse.

[0027] According to the invention, the bidirectional correction device 21 usually comprises a clutch mechanism (not shown) making it possible to pass, reversibly, between a correction position in which the correction device 21 is coupled to a correction control member 4 in order to correct the display device 11 in a bidirectional manner, and a disengaged position in which the correction device 21 is decoupled from the control member 4 in order to prohibit any correction of the device 11 display.

[0028] By way of example, the clutch mechanism used for the invention is of the pull-tab - sliding pinion - return type like that disclosed in chapter 3.2.7 entitled "winding and setting the time" of the book “horology theory”, Charles-André REYMONDIN et al., Fédération des Écoles techniques (FET), July 2015, ISBN 2-940025-47-9 or in chapter 3.2.7 entitled “winding and setting the hands” from the book “the theory of horology”, Charles-André REYMONDIN et al., Fédération des Écoles techniques (FET), July 2015, ISBN 2-940025-49-5. The nomenclatures for the pull tab - sliding pinion - return of the release mechanism are taken from this chapter 3.2.7.

The correction control member 4 can be of different types such as a rod (which can be the same as for the time correction and the winder) extended by a crown as in the example in the figure 1, a rotating bezel, two pushers (one to increase the display value and the other to decrease its display value) or a rotating back. [0030] By “independently with respect to the force transmission mechanism 5”, we mean according to the invention that there is no direct coupling between the kinematic chains of the correction device 21 and the mechanism 5 of force transmission although both are each capable of controlling for example the same date wheel 12 of the calendar display device 11.

[0031] By “timepiece 2”, we mean all types of instruments for measuring or counting time such as pendulums, clocks, watches, etc.

[0032] By “watch movement 3”, we mean all types of mechanism capable of counting time whether they are powered by mechanical energy (for example a barrel) or electrical energy (for example a battery).

By “calendar module 1”, we mean a subassembly intended to be fixed on a watch movement 3 to add at least one additional calendar display function. The calendar module 1 may include several components allowing a calendar display from the simplest to the most sophisticated such as a simple, annual, perpetual or secular calendar and/or with other displays such as the day of the week, the number of the week, the month, the year, the day-night or morning/afternoon display and/or the moon phase of all types (display of the moon seen from the northern or southern hemisphere, or even the 'moon display for the northern and southern hemisphere).

[0034] In the example illustrated in Figures 1 and 2, 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 not only to a calendar module 1. However, the explanation of the invention is made below in the particular embodiment where the correction device 21 is installed in a calendar module 1.

[0035] In the example visible in Figures 2 and 3, the calendar module 1 is coupled at the center of its board 7 to an output shaft (not shown) of the watch movement 3 such as that secured, preferably, to the wheel hours. The output shaft (not shown) of the watch movement 3 is thus permanently coupled to a force transmission mechanism 5 intended to drive the calendar display device 11. Of course, other output shafts of the watch movement 3 centered or not on the board 7 can be chosen without departing from the scope of the invention.

As will be explained below, the calendar module 1 can also be coupled to a return of a clutch mechanism of the watch movement 3 in order to be able to couple the correction of the time display 17 ( usually last notch taken from the crown 4) and the correction of at least one of the displays 16A, 16B, 16C, 16D, 16E of the calendar display device 11 (usually an intermediate notch taken from the crown 4). Alternatively or additionally, the correction of at least one of the displays 16A, 16B, 16C, 16D, 16E of the calendar display device 11 may include dedicated elements mounted only in the calendar module 1. In practice, in the context of the invention, the correction device 21 makes it possible to maintain synchronization between the different displays 16A, 16B, 16C, 16D, 16E, while a correction of only one would risk losing this synchronization. We could nevertheless provide specific correctors dedicated to particular situations. [0037] As better visible in the example of Figure 1, the timepiece 2 comprises a calendar display device 11 comprising a display with a date hand 16A, a display with a month hand 16B, a display with year discs 16C, a day of the week needle display 16D and a moon phase disc display 16E. In the example illustrated in Figure 1, the timepiece 2 further comprises a time hand display 17 (hours and minutes) mounted in the usual manner on the watch movement 3. Of course, other types displays other than those described above can be provided such as a cylinder, a sphere, a strip, a ring, one or more needles respectively pointers or one or more disks in linear, continuous, discontinuous, intermittent or operating mode. retrograde with semi-instantaneous or instantaneous jump and/or in combination with these types of display listed without departing from the scope of the invention.

[0038] In the example illustrated in Figures 2-6, 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 wheel 6C end of month order. The reduction mechanism 8 is formed of internal teeth 8A of the end-of-month control wheel 6C forming an external sun gear permanently coupled with three satellites 8B pivotally mounted on the board 7. Preferably, the three satellites 8B are coupled permanently to a pinion forming a central sun gear of an output shaft (not shown) of the watch movement 3 secured to the hour wheel. The reduction mechanism 8 thus makes it possible to impose a rotation of the end-of-month control wheel 6C every twenty-four hours around the first axis A1 in the center of board 7 of calendar module 1.

The end-of-month control wheel 6C is therefore the mechanical element which distributes the force received from the watch movement 3 to the rest of the force transmission mechanism 5. Typically, in the example illustrated in Figures 2, 4 and 6, the date control finger 6A is formed in the board of the wheel 9A of the cog 9 which is integral in movement with the end of month control wheel 6C. As better visible to Figures 4 and 6, the wheels 9A and 6C are stacked one on top of the other. The date control finger 6A is intended, depending on its angle of rotation relative to the first axis A1, to be temporarily coupled once a day with the date wheel 12 of a calendar display device 11 to increment by one unit on the date display 16A every twenty-four hours during normal operation of the watch.

[0040] As better visible in the example of Figure 4, the date control finger 6A is arranged elastically 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 greater than a predetermined value. The date control finger 6A thus comprises a body 6A1 oriented substantially radially and arranged in the wheel 9A using two flexible rods 6A2 substantially perpendicular on either side of the body 6A1. In the rest position, the date control finger 6A projects from the periphery of the wheel 9A and is capable, when subjected to a stress greater than a predetermined value (which is greater than the stress necessary to drive the wheel 12 of date in normal operation) to retract elastically (by deformation of the rods 6A2) towards the first axis A1. Preferably, the finger 6A (and therefore the body 6A1), the flexible rods 6A2 and the wheel 9A are made in a single piece obtained by addition of material (three-dimensional printing, growth in a mold, etc.) or by removal of material (mechanical machining, chemical engraving, etc.).

[0041] In the example illustrated in Figure 3, the end-of-month control wheel 6C comprises peripheral teeth intended, depending on its angle of rotation relative to the first axis A1, to be temporarily coupled at the end of the months of February, April, June, September and November to an end-of-month wheel 13 of the calendar display device 11 to selectively increment the date display 16A by at least one additional unit as a function of the number of days in the month .

[0042] In the example illustrated in Figures 2-6, the date display 16A is of the perpetual type, that is to say it changes by two date units at the end of the month of April, June, of September and November but also of four or three calendar units at the end of the month of February depending on whether the current year is a leap year or not. We therefore understand why the calendar display device 11 is also capable of managing the movements of the month 16B and year 16C displays by coupling the date wheel 12 with a dedicated cog which will not be explained in more detail because using reduction gears, of known parameter setting from a three hundred and sixty degree rotation of the date wheel 12 each month. [0043] In the example illustrated in Figures 2-4 and similarly to the date control finger 6A, the day control finger 6B is formed in the board of the wheel 9B of the cog 9. The wheel 9B is coupled permanently with the 6C end-of-month control wheel using a 9C reference. The day control finger 6B is intended, depending on its angle of rotation relative to the second axis A2, to be temporarily coupled once a day with the day wheel 10 (star with seven teeth in the example of Figure 3- 4) a calendar display device 11 for incrementing the day of the week display 16D by one unit every twenty-four hours. We can also see that the cog 9 is extended after the wheel 9B in order to drive, in a reduction compared to the wheel 9B, the moon phase display 16E. We therefore understand why the calendar display device 11 is also capable of managing the movements of the moon phase display 16E by coupling the wheel 9B with a dedicated cog which will not be explained in more detail because it uses cogs. reduction, parameterization known per se from a rotation of three hundred and sixty degrees of the wheel 9B each day.

[0044] As better visible in the example of Figures 3 and 4 and in a manner similar to the date control finger 6A, the day control finger 6B is arranged elastically on the wheel 9B in the force transmission mechanism 5 of so as to be able to retract elastically towards the second axis A2 when it is subjected to a stress greater than a predetermined value. The day control finger 6B thus comprises a body 6B1 oriented substantially radially and arranged in the wheel 9B using four flexible rods 6B2 substantially perpendicular on either side of the body 6B1. In the rest position, the day control finger 6B projects from the periphery of the wheel 9B and is capable, when subjected to a stress greater than a predetermined value (which is greater than the stress necessary to drive the day star 10 in normal operation) to retract elastically (by deformation of the rods 6B2) towards the second axis A2. Preferably, the finger 6B (and therefore the body 6B1), the flexible rods 6B2 and the wheel 9B are made in a single piece obtained by addition of material (three-dimensional printing, growth in a mold, etc.) or by removal of material (mechanical machining, chemical engraving, etc.).

[0045] Advantageously according to the invention, the calendar module 1 comprises a device 21 for bidirectional correction of at least two of the displays 16A, 16B, 16C, 16D, 16E and comprising the date display 16A of the device 11 display. As visible in the example of Figures 4 and 7, the bidirectional correction device 21 comprises at least one correction mobile 22, arranged to control the date wheel 12 of the calendar display device 11 independently in relation to to the force transmission mechanism 5 so as not to disturb the latter during the correction phases.

[0046] In the example illustrated in Figures 4 and 7, the correction mobile 22 comprises a correction finger 22A formed in a first level of the correction mobile 22, and intended, according to its angle of rotation relative to the third axis A3 , to be temporarily coupled every three hundred and sixty degrees with the date wheel 12 of the calendar display device 11 to correct the date display 16A both in an increasing and decreasing manner without influencing the indexing of the transmission mechanism 5 of force relative to the calendar display device 11.

[0047] Indeed, advantageously according to the invention, the correction system 21 does not act on the force transmission mechanism 5 coupled to the watch movement 3 as is generally the case, but has its own kinematic chain acting on the calendar display device 11 in order to be able to adapt to a very wide variety of calendar modules 1 and in particular a wide variety of calendar display complications. 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 makes it possible to both increase and decrease the value of the date display 16A.

[0048] As explained above, preferably according to the invention, the date control finger 6A can be arranged elastically in the force transmission mechanism 5 so as to be able to elastically retract from the date wheel 12 when this The latter is moved by the correction finger 22A of the correction mobile 22 while the date control finger 6A is on the trajectory of the date wheel 12. This configuration ensures that the correction is not prevented between 11 p.m. and 1 a.m. each day. Although this function is not essential because it is rare for corrections to be made at this time of the night, it is offered as an advantageous option of the invention.

[0049] Furthermore, in the example illustrated in Figures 3-7, the bidirectional correction device 21 comprises a correction gear 23 permanently coupled to the correction mobile 22 and arranged to control the day wheel 10 (seven star teeth in the example of Figure 3-4) of the calendar display device 11 independently of the force transmission mechanism 5 so as not to disturb the latter during the correction phases.

More precisely, the correction gear 23 mainly comprises a central wheel 23A and an end wheel 23B connected by intermediate references to a pinion 22C formed in a third level of the correction wheel 22. In the example illustrated in Figures 3-4, there is a reference between the pinion 22C and the central wheel 23A which is coupled to the end wheel 23B by another reference. However, this configuration of the train 23 can be adapted depending on the architecture of the calendar module 1 or the watch movement 3 without departing from the scope of the invention.

[0051] In the example illustrated in Figures 3-4, the end wheel 23B comprises a pin 23B1 formed in extra thickness and intended, depending on the angle of rotation of the end wheel 23B, to be temporarily coupled every three hundred and sixty degrees with the day wheel 10 (seven-toothed star in the example of Figure 3-4) of the calendar display device 11 to correct the display 16D of the day of the week (at the same time at less than the date display 16A) both in an increasing and decreasing manner without influencing the indexing 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 on the force transmission mechanism 5 coupled to the watch movement 3 in the usual manner but has its own kinematic chain acting on the calendar display device 11 as well to increase or decrease the value of the day of the week display 16D and each other display 16E (moon) linked to the day of the week display 16D without desynchronizing them.

[0052] As explained above, preferably according to the invention, the day control finger 6B is arranged elastically in the force transmission mechanism 5 so as to be able to elastically retract from the day wheel 10 when the latter is moved by the correction gear 23 while the day control finger 6B is on the trajectory of the day wheel 10. Similar to that of the date control finger 6A, this configuration of the day control finger 6B makes it possible to not prevent the correction between 11 p.m. and one a.m. each day. Although this function is not essential because it is rare for corrections to be made at this time of the night, it is offered as an advantageous option of the invention.

[0053] To the extent that the example illustrated in Figures 2-6 includes a perpetual type date display 16A, the bidirectional correction device 21 uses the central wheel 23A of the correction gear 23 to control the end wheel 13. month of the calendar display device 11 independently of the force transmission mechanism 5 so as not to disturb the latter during the correction phases. Advantageously according to the invention, even in this particular variant in which the calendar module 1 comprises a perpetual calendar display 16A, the correction system 21 does not act on the force transmission mechanism 5 coupled to the watch movement 3 of usual manner but has its own kinematic chain acting on the calendar display device 11 in order to be able to adapt to a very wide variety of calendar modules 1. In addition, the correction device 21 makes it possible to both increase and decrease the value of the date display 16A and the other displays 16B (month), 16C (year) linked to the perpetual calendar mechanism without desynchronizing them.

[0054] According to an optional function, the correction mobile 22 may include an elastic force limiting mechanism 25 so as to elastically disengage the correction movement in a bidirectional manner, above a predetermined torque applied to the mobile 22 of correction, so that in particular the correction gear 23 does not drive the end-of-month wheel 13 of the calendar display device 11, while the end-of-month control wheel 6C is meshed with the end-of-month wheel 13. month of the calendar display device 11. This configuration avoids damage to the watch movement 3 by allowing the correction to be disengaged between midnight and three o'clock at the end of the month of February, April, June, September and November. Although this function is not essential (the correction is not possible because there is resistance to the correction due to the end of month control wheel 6C which is meshed with the end of month wheel 13 of the device 11 d calendar display) because it is rare that corrections are made at this time of the night, it is proposed as an advantageous option of the invention which discourages the user from forcing on the control member 4 such as the crown in the example of Figure 1. [0055] More precisely, in the example illustrated in Figure 7, the elastic force limiting mechanism 25 comprises a groove 22D on the periphery of a fourth level of the correction mobile 22 and a wheel 24 cooperating with the groove 22D. The wheel 24 has peripheral teeth 24A intended to receive, when the correction device 21 is in the engaged position, the correction force that the user exerts on the correction control member 4 such as the crown in the intermediate position in the example of Figure 1. The wheel 24 comprises elastic elements 24b distributed over its internal diameter and whose ends are intended to come into contact with the groove 22D.

[0056] In the example of Figure 7, the elastic elements 24b extend in the form of four Y-shaped parts distributed symmetrically around the third axis A3. Below the predetermined torque applied, the wheel 24 is elastically in a stable position and integral in rotation with the groove 22D. Above the predetermined torque applied, the wheel 24 is elastically decoupled and can no longer transmit force to the spline 22D, the wheel 24 rotates around the third axis A3. Finally, as soon as the stress is released to once again pass below the predetermined torque, the elastic elements 24b resume a stable elastic position against the groove 22D by once again making the wheel 24 integral in rotation with the groove 22D. [0057] Preferably and taking into account the forces exerted by the user on the control member 4, the elastic force limiting mechanism 25 comprises a predetermined disengagement torque identical for each direction of rotation around the third axis A3 and typically between 3 and 5 Nmm, typically substantially equal to 4 Nmm (which is greater than the stress necessary to drive the date wheel 12, the end of month wheel 13 and the day wheel 10 in normal correction operation and which is also greater than the stress necessary to elastically retract the fingers 6A, 6B). However, of course, the predetermined disengagement torque could be different depending on the direction of rotation around the third axis A3 by adapting the shape of the elastic elements 24b and/or each predetermined disengagement torque could be greater or less than 4 Nmm without leaving the framework of the invention.

[0058] Finally, the correction device 21 can, optionally, comprise a cam 22b - elastic element 26 assembly allowing, in the disengaged position of the bidirectional correction device 21, the correction mobile 22 to be in a rest position predetermined outside the trajectory of the date wheel 12. We thus understand that in the disengaged position, the correction mobile 22 is always in the same rest position to allow, for example, to provide an equivalent displacement for the increase (first direction of movement) as the decrease (second direction of reverse movement in the first direction) of the value of the calendar display 16A, 16B, 16C, 16D, 16E. In the example illustrated in Figures 3 and 4, the cam 22b is mounted in a second level of the correction mobile 22. In addition, the elastic element 26 is mounted on a fixed part (the board 7 using screws) of the calendar module 1, and exerts a pushing force against an external profile of the cam 22B. The shape of the elastic element 26 in contact with the cam 22B, as well as the shape of the latter, are determined so as to drive, in the disengaged position of the bidirectional correction device 21, the correction mobile 22 in its rest position predetermined.

[0059] The invention is not limited to the embodiments and variants presented and other embodiments and variants will be clearly apparent to those skilled in the art. So, the above achievements are examples. In no way limiting, more complicated or simpler displays can be considered without departing from the scope of the invention.

[0060] Furthermore, as explained above, the correction device 21 cannot be limited to installation in a calendar module 1. The correction device 21 thus applies to installation in a watch movement 3 in general without departing from the scope of the invention.

Claims

CLAIMS Device (21) for bidirectional correction of at least two displays (16A, 16B, 16C, 16D, 16E) including a date display (16A) of a calendar display device (11) comprising a mobile (22 ) correction and a correction gear (23) permanently coupled to the correction mobile (22) arranged to correct at the same time said at least two displays (16A, 16B, 16C, 16D, 16E) of the device (11) calendar display independently with respect to a force transmission mechanism (5) of said at least two displays (16A, 16B, 16C, 16D, 16E) intended to increment them periodically in order to maintain synchronization between said at least two displays (16A, 16B, 16C, 16D, 16E) of the calendar display device (11) during the correction phases. Watch movement (3) characterized in that it comprises a device (21) for bidirectional correction of the display device (11) according to claim 1, the watch movement (3) comprising a force transmission mechanism (5) comprising a date control finger (6A) arranged to control a date wheel (12) of a calendar display device (11) to increment the date display (16A) by one unit every twenty-four hours, and in that the correction mobile (22) of the bidirectional correction device (21) is arranged to control the date wheel (12) of the calendar display device (11) independently of the mechanism ( 5) force transmission so as not to disturb the latter during the correction phases. Watch movement (3) according to the preceding claim, in which the date control finger (6A) is arranged elastically in the force transmission mechanism (5) so as to be able to elastically retract from the date wheel (12). when the latter is moved by the correction wheel (22) while the date control finger (6A) is on the trajectory of the date wheel (12). Watch movement (3) according to claim 2 or 3, in which the force transmission mechanism (5) comprises a day control finger (6B) arranged to control a day wheel (10) of the day control device (11). calendar display for incrementing by one unit at least one day display (16D) every twenty-four hours, the correction gear (23) of the bidirectional correction device (21) being arranged to control the wheel (10) of the day of the calendar display device (11) independently of the force transmission mechanism (5) so as not to disturb the latter during the correction phases. Watch movement (3) according to the preceding claim, in which the day control finger (6B) is arranged elastically in the force transmission mechanism (5) so as to be able to elastically retract from the day wheel (10). when the latter is moved by the correction gear (23) while the day control finger (6B) is on the trajectory of the day wheel (10). Watch movement (3) according to any one of claims 2 to 5, in which the force transmission mechanism (5) comprises an end-of-month control wheel (6C) arranged to control an end-of-month wheel (13). month of the calendar display device (11) to selectively increment the date display (16A) by at least one additional unit as a function of the number of days in the month, the correction gear (23) of the device (21) ) of bidirectional correction being arranged 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 disturb the latter during the phases of correction. Watch movement (3) according to the preceding claim, in which the correction mobile (22) comprises an elastic force limiting mechanism (25) so as to elastically disengage the correction movement in a bidirectional manner above a predetermined torque applied to the correction wheel (22) so that the correction gear (23) does not drive the end-of-month wheel (13) of the calendar display device (11) while the control wheel (6C) end of month is meshed with the end of month wheel (13) of the calendar display device (11). Watch movement (3) according to any one of claims 2 to 7, in which the bidirectional correction device (21) comprises a clutch mechanism making it possible to pass between a correction position in which the correction device (21) is coupled to a correction control member (4) in order to correct the display device (11) in a bidirectional manner, and a disengaged position in which the correction device (21) is decoupled from the control member (4) in order to prohibit any correction of the display device (11). Watch movement (3) according to the preceding claim, in which the correction device (21) comprises a cam (22B) - elastic element (26) assembly allowing, in the disengaged position, the correction mobile (22) to be in a predetermined rest position outside the trajectory of the date wheel (12). Watch movement (3) according to the preceding claim, in which the cam (22B) is mounted on the correction mobile (22) and, the elastic element (26), mounted on a fixed part (7) of the watch movement (3). ), and exerts a pushing force against an external profile of the cam (22B) capable of driving, in the disengaged position, the correction mobile (22) into its predetermined rest position. Timepiece (2), characterized in that it comprises a watch movement (3) according to one of claims 2 to 10.