Bidirectional correction device and timepiece movement comprising such a device

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 CLOCK MOVEMENT COMPRISING SUCH A DEVICE TECHNICAL FIELD OF THE INVENTION

[0001] 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 for correcting, for example, the date display using a control member such as a crown, pusher or corrector. In general, correction mechanisms comprise a gear train which meshes or engages with the finishing gear 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 to accommodate several different watch movements while still allowing a sophisticated calendar display such as an annual or perpetual calendar and / or with other displays such as the 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 invention relates to a device for bidirectional correction of at least two displays, including a date display of a calendar display device comprising a correction wheel set and a correction gear train permanently coupled to the correction wheel set, arranged to correct at the same time said at least two displays of the calendar display device independently of 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 in particular a wide variety of calendar display complications. This also makes it possible not to desynchronize the corrected displays with each other. In addition, 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 bidirectional correction device for the display device as presented above, the watch movement comprising a force transmission mechanism comprising a date control finger 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 wheel set 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 disturb the latter during the correction phases.

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

[0010] The date control finger may be elastically arranged 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 set while the date control finger is in the path of the date wheel. This configuration makes it possible not to prevent correction 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 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 incrementing at least one day display by one unit 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 force transmission mechanism so as not to disturb the latter during the correction phases.

[0012] 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 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. In addition, the correction device makes it possible to increase as well as 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 may be elastically arranged in the force transmission mechanism so as to be elastically retractable from the day wheel when the latter is moved by the correction gear train while the day control finger is in the path of the day wheel. This configuration makes it possible not to prevent correction 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 night, it is proposed 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 an end-of-month control wheel arranged to control an end-of-month wheel of the calendar display device to increment the date display by at least one additional unit depending on the number of days in the month, the correction gear train 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.

[0015] 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 manner but has its own kinematic chain acting on the display device. calendar in order to be able to adapt to a very wide variety of calendar display devices. In addition, the correction device allows both the value of the annual, perpetual, or secular type calendar display to be increased or decreased without desynchronizing it.

[0016] The correction wheel set may include an elastic force-limiting mechanism so as to elastically disengage the correction movement bidirectionally above a predetermined torque applied to the correction wheel set so that the correction gear does not drive the month-end wheel of the calendar display device while the month-end control wheel is meshed with the month-end wheel of the calendar display device. This configuration prevents 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 it encounters resistance to correction due to the end-of-month control wheel which is meshed with the end-of-month wheel of the calendar display device) because it is rare that corrections are made at this time of night, it is proposed as an advantageous option of the invention which discourages the user from forcing the control member such as a crown.

[0017] The bidirectional correction device may include a clutch mechanism for switching between a correction position in which the correction device is coupled to a correction control member to correct the display device bidirectionally, and a disengaged position in which the correction device is decoupled from the control member to prohibit 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 may, for example, be mounted on the correction wheel and the elastic element, mounted on a fixed part of the watch movement, and exert a thrust force against an external profile of the cam capable of driving, in the disengaged position, the correction wheel into its predetermined rest position.

[0019] It is thus understood that, in the disengaged position, the correction wheel is always in the same rest position to allow, for example, to provide an equivalent movement for the increase (first direction of movement) as for the decrease (second direction of movement opposite to the first direction) of the value of the calendar display.

[0020] Finally, the invention relates to a timepiece characterized in that it comprises a watch movement as presented above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features and advantages of the invention will become clear from the description given below, for information purposes 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 a correction device according to the invention; Figure 5 is a perspective view from above of an end-of-month control wheel superimposed on an element of an example of a correction gear train 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 a correction gear train according to the invention; Figure 7 is a perspective view from below of an example of a correction wheel set according to the invention.; DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT OF THE INVENTION

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

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

[0024] In the present description, to clarify the explanation of the invention axes (A1, A2, etc.) are arbitrarily declared as a first axis, a second axis, etc. This is a simple nomenclature for differentiating and naming non-identical geometric elements. This nomenclature does not imply a priority of one axis over another and such names can easily be interchanged without departing from the scope of the present description. This nomenclature also does not imply an order, i.e. 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 elements or organs fixed in relation to the given reference frame, such as for example in relation to the calendar module or the watch movement, i.e. 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).

[0026] 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 time of the correction, it can be faster to decrease the days, date and month of the display device than the reverse.

[0027] According to the invention, the bidirectional correction device 21 comprises, in the usual manner, a clutch mechanism (not shown) making it possible to switch, 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 prevent any correction of the display device 11.

[0028] For example, the clutch mechanism used for the invention is of the pull rod - sliding pinion - idler type like that disclosed in chapter 3.2.7 entitled "winding and setting the time" of the book "theory of horology", 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" of the book "the theory of horology", Charles-André REYMONDIN et al., Fédération des Écoles techniques (FET), July 2015, ISBN 2-940025-49-5. The pull rod - sliding pinion - idler nomenclatures of the disengagement mechanism are taken from this chapter 3.2.7.

[0029] The correction control member 4 can be of different types such as a stem (which can be the same as for the time correction and the winder) extended by a crown as in the example of figure 1, a rotating bezel, two pushers (one to increase the value of the display and the other to decrease its value of the display) or a rotating bottom.

[0030] By "independently with respect to the force transmission mechanism 5", it is meant according to the invention that there is no direct coupling between the kinematic chains of the correction device 21 and the force transmission mechanism 5 although each one is 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 clocks, small 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).

[0033] By "calendar module 1" is meant a subassembly intended to be fixed on a watch movement 3 to add at least one additional calendar display function to it. The calendar module 1 may comprise 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 any type (display of the moon seen from the northern or southern hemisphere, or even the display of the moon 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 given 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 hour wheel. 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.

[0036] As will be explained below, the calendar module 1 can also be coupled to a return of a clutch mechanism of the clock movement 3 in order to be able to couple the correction of the time display 17 (usually the 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 pulled 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 comprise dedicated elements mounted only in the calendar module 1. In practice, within the framework of the invention, the correction device 21 makes it possible to maintain synchronization between the different displays 16A, 16B, 16C, 16D, 16E, whereas a correction of only one would risk losing this synchronization. However, specific dedicated correctors could be provided for particular situations.

[0037] As best seen in the example of Figure 1, the timepiece 2 comprises a calendar display device 11 comprising a date hand display 16A, a month hand display 16B, a year disc display 16C, a day of the week hand display 16D and a moon phase disc display 16E. In the example illustrated in Figure 1, the timepiece 2 further comprises a display with time hands 17 (hours and minutes) mounted in the usual manner on the watch movement 3. Of course, other types of displays than those described above may be provided such as a cylinder, a sphere, a band, a ring, one or more hands respectively pointers or one or more discs in linear, continuous, discontinuous, intermittent or retrograde operating mode 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 an end-of-month control wheel 6C. The reduction mechanism 8 is formed of an internal toothing 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 permanently coupled 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 at the center of the board 7 of the calendar module 1.

[0039] 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 plate of the wheel 9A of the gear train 9 which is integral in movement with the end-of-month control wheel 6C. As best seen in Figures 4 and 6, the wheels 9A and 6C are stacked on top of each 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 the date display 16A by one unit every twenty-four hours during normal operation of the watch.

[0040] As best seen in the example of Figure 4, 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 it is 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 it is subjected to a stress greater than a predetermined value (which is greater than the stress necessary to drive the date wheel 12 in normal operation) of retracting 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 adding material (three-dimensional printing, growth in a mold, etc.) or by removing material (mechanical machining, chemical etching, etc.).

[0041] In the example illustrated in Figure 3, the end-of-month control wheel 6C comprises peripheral teeth intended, according to 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 April, June, September and November but also by four or three date units at the end of February depending on whether the current year is a leap year or not. It is therefore understandable 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 gear train which will not be explained in more detail because it uses reduction gear trains, with a setting known per se from a rotation of the date wheel 12 through three hundred and sixty degrees 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 plate of the wheel 9B of the gear train 9. The wheel 9B is permanently coupled with the end-of-month control wheel 6C using a return wheel 9C. The day control finger 6B is intended, depending on its rotation angle relative to the second axis A2, to be temporarily coupled once a day with the day wheel 10 (seven-toothed star in the example of Figure 3-4) of a calendar display device 11 to increment the day of the week display 16D by one unit every twenty-four hours. It can also be seen that the gear train 9 is extended after the wheel 9B in order to drive, at a reduction relative 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 gear train which will not be explained in more detail because it uses reduction gear trains, with a setting known per se from a rotation of the wheel 9B through three hundred and sixty degrees each day.

[0044] As better seen in the example of Figures 3 and 4 and similarly to the date control finger 6A, the day control finger 6B is arranged elastically on the wheel 9B in the force transmission mechanism 5 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 to each other 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) of retracting 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 adding material (three-dimensional printing, growth in a mold, etc.) or by removing material (mechanical machining, chemical etching, 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 display device 11. As visible in the example of Figures 4 and 7, the bidirectional correction device 21 comprises at least one correction wheel 22, arranged to control the date wheel 12 of the calendar display device 11 independently of 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 wheel 22 comprises a correction finger 22A formed in a first level of the correction wheel 22, and intended, depending on 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 force transmission mechanism 5 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 the latter is moved by the correction finger 22A of the correction wheel set 22 while the date control finger 6A is on the path of the date wheel 12. This configuration makes it possible not to prevent the correction 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 night, it is proposed 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 train 23 permanently coupled to the correction wheel set 22 and arranged to control the day wheel 10 (seven-toothed star 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.

[0050] More specifically, the correction gear train 23 mainly comprises a central wheel 23A and an end wheel 23B connected by intermediate gears to a pinion 22C formed in a third level of the correction wheel set 22. In the example illustrated in figures 3-4, there is a gear between the pinion 22C and the central wheel 23A which is coupled to the end wheel 23B by another return. However, this configuration of the gear train 23 can be adapted according to 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 excess 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 day of the week display 16D (at least at the same time as 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 to both increase and 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 train 23 while the day control finger 6B is on the path of the day wheel 10. In a manner similar to that of the date control finger 6A, this configuration of the day control finger 6B makes it possible not to prevent the correction 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 night, it is proposed as an advantageous option of the invention.

[0053] Insofar as the example illustrated in Figures 2-6 comprises a perpetual date display 16A, the bidirectional correction device 21 uses the central wheel 23A of the correction gear train 23 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 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 in the 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 wheel set 22 may comprise an elastic force-limiting mechanism 25 so as to elastically disengage the correction movement bidirectionally, above a predetermined torque applied to the correction wheel set 22, so that in particular the correction gear train 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 of the calendar display device 11. This configuration prevents 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 (correction is not possible because it encounters resistance to correction due to the end-of-month control wheel 6C which is meshed with the end-of-month wheel 13 of the calendar display device 11) because it is rare that corrections are made at this time of night, it is proposed as an advantageous option of the invention which discourages the user from forcing the control member 4 such as the crown in the example of figure 1. .

[0055] More specifically, 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 wheel set 22 and a wheel 24 cooperating with the groove 22D. The wheel 24 comprises 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 the ends of which 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 spline 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 pass again below the predetermined torque, the elastic elements 24b resume a stable elastic position against the spline 22D by making the wheel 24 integral in rotation with the spline 22D again.

[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 disengaging torque that is 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 required 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 required to elastically retract the fingers 6A, 6B). However, of course, the predetermined disengaging 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 disengaging torque could be greater or less than 4 Nmm without departing from the scope of the invention.

[0058] Finally, the correction device 21 may, optionally, comprise a cam 22b - elastic element 26 assembly allowing, in the disengaged position of the bidirectional correction device 21, the correction wheel set 22 to be in a predetermined rest position outside the trajectory of the date wheel 12. It is thus understood that, in the disengaged position, the correction wheel set 22 is always in the same rest position to allow, for example, to provide an equivalent movement 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 16A, 16B, 16C, 16D, 16E. In the example illustrated in FIGS. 3 and 4, the cam 22b is mounted in a second level of the correction wheel set 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 thrust 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 wheel set 22 into its predetermined rest position.

[0059] The invention is not limited to the embodiments and variants presented and other embodiments and variants will become clear to those skilled in the art. Thus, the above embodiments are examples. Without being limiting, more complicated or simpler displays can be envisaged without departing from the scope of the invention.

[0060] Furthermore, as explained above, the correction device 21 cannot be limited to an implantation in a calendar module 1. The correction device 21 thus applies to an implantation 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 correction wheel set (22) and a correction gear train (23) permanently coupled to the correction wheel set (22) arranged to correct at the same time said at least two displays (16A, 16B, 16C, 16D, 16E) of the calendar display device (11) 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.Clock movement (3) characterized in that it comprises a device (21) for bidirectional correction of the display device (11) according to claim 1, the clock 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 wheel set (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 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 retract elastically from the date wheel (12) when the latter is moved by the correction wheel set (22) while the date control finger (6A) is on the path of the date wheel (12).Clock movement (3) according to claim 2 or 3, wherein the force transmission mechanism (5) comprises a day control finger (6B) arranged to control a day wheel (10) of the calendar display device (11) to increment at least one day display (16D) by one unit every twenty-four hours, the correction gear train (23) of the bidirectional correction device (21) being arranged to control the day wheel (10) of the calendar display device (11) independently of the force transmission mechanism (5) so as not to disturb the latter during the correction phases. Clock 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 retract elastically from the day wheel (10) when the latter is moved by the correction gear train (23) while the day control finger (6B) is on the path of the day wheel (10).Clock movement (3) according to any one of claims 2 to 5, wherein the force transmission mechanism (5) comprises an end-of-month control wheel (6C) arranged to control 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, the correction gear train (23) of the bidirectional correction device (21) 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 correction phases.Clock movement (3) according to the preceding claim, in which the correction wheel set (22) comprises an elastic force-limiting mechanism (25) so as to elastically disengage the correction movement bidirectionally above a predetermined torque applied to the correction wheel set (22) so that the correction gear train (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) 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 allowing 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) bidirectionally, 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 wheel (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 wheel set (22) and the elastic element (26) is mounted on a fixed part (7) of the watch movement (3), and exerts a thrust force against an external profile of the cam (22B) capable of driving, in the disengaged position, the correction wheel set (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.

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