Month and leap year display mechanism for a watch part
Patent Information
- Authority / Receiving Office
- CH · CH
- Patent Type
- Patents
- Current Assignee / Owner
- GLASHUTTER UHRENBETRIEB GMBH
- Filing Date
- 2019-02-14
- Publication Date
- 2026-07-15
Abstract
Description
Scope of the invention
[0001] The invention relates to a mechanism for displaying the month and leap year for a timepiece.
[0002] The invention relates to the field of horological complications comprising a calendar. Background of the invention
[0003] Calendar mechanisms are among the classic horological complications. Some complex mechanisms are capable of managing the length of months or years. Leap year displays or indicators allow the user to determine whether the current year is a leap year or not, and, depending on the watch's level of complexity, can manage the display of the last day of February and the correct transition to the first of March.
[0004] In the case of the simplest calendar mechanisms, simply knowing whether the current year is a leap year or not allows the user to correctly adjust the display for the last days of the current month, generally via the control stem. The mechanisms differ depending on whether it is a simple calendar, an annual calendar, or a perpetual calendar. In the latter cases, the leap year management mechanism requires expensive components, for example, a Maltese cross cam, and takes up a certain amount of space inside the watch case, or the case of the timepiece if it is static, such as a clock.
[0005] The leap year display is often done by displaying a sector of a four-quadrant disk in a small window, or by the cooperation of an index with a part of such a disk. Summary of the invention
[0006] The present invention proposes to combine a display of the current month with a display of the type of year, leap year or not, with a very simple, inexpensive, very reliable, easy-to-correct mechanism, and limited to a reasonable volume in the timepiece concerned.
[0007] To this end, the invention relates to a mechanism for displaying the month and leap year for a timepiece, according to claim 1.
[0008] The invention further relates to a calendar mechanism comprising a date mechanism arranged to cooperate with a movement of a timepiece, and comprising at least one such mechanism for displaying the month and leap year, according to claim 17.
[0009] The invention further relates to a timepiece comprising at least one clock movement arranged to drive at least one such month and leap year display mechanism, and / or to drive at least one such calendar mechanism. Brief description of the drawings
[0010] Other features and advantages of the invention will become apparent from the following detailed description, with reference to the accompanying drawings, where: <tb> – <sep>Figure 1 schematically represents, in plan view, a watch which includes a calendar mechanism, with a date mechanism with a date display in a date window at approximately three o'clock, near the watch's setting stem, and with a month and leap year display mechanism according to the invention, which includes a month display window extending over a quadrant between three and six o'clock, in a first embodiment where a static month scale extends over the watch dial along this month window, and where a month display wheel has an annular track which carries four different indexes, each appearing in the window for only one year and pointing to the name of the current month; the figure shows a leap year specific index which points to the current month of February; <tb> – <sep>Figure 2 represents, similarly to Figure 1, a detail of the same watch when it is an ordinary year: an ordinary year index replaces the special leap year index of Figure 1, and points to the month of February of the current year; <tb> – <sep>Figures 3 to 6 illustrate the control mechanism of the mobile month display: <tb> – <sep>Figure 3 represents, similarly to Figure 1, the entire month display mechanism, which has four triangular indexes, one of which, near six o'clock, is different from the other three and is the leap year indicator, and the cooperation of this month display mechanism with the control mechanism; <tb> – <sep>Figure 4 is a detailed view of this control mechanism, at the approach of the end of the month, from its entry at the level of an input mobile 31, arranged to be driven by the movement or by a date mechanism, and of which a finger is arranged to rotate a first star, which drives a stop wheel through a gear; this stop wheel has hollows arranged to cooperate with a ratchet returned by a spring to a rest position, and it is integral with a second star arranged to drive pins of the month display mobile, when the stop wheel rotates, and to hold these pins in position when the stop wheel is held in place by the ratchet in the absence of rotation of the first star; <tb> – <sep>Figure 5, similar to Figure 4, is the representation of the state of the control mechanism on the eighth day of a month; <tb> – <sep>Figure 6, similar to Figure 4, is the representation of the state of the control mechanism on the last day of a month, shortly before midnight and the jump in rotation of the second star to drive the mobile display of the months; <tb> – <sep>Figures 7 to 9 illustrate a second variant, where the month display mechanism has lower markings, and the month window has a glass that is at least partially translucent and bears twelve upper translucent markings, each corresponding to a month of a year; the month display mechanism rotates under this glass, and the four lower markings are equidistant, and are revealing, colored and / or reflective markings, each with the angular amplitude of a month marking: <tb> – <sep>Figure 7 illustrates separately this mirror and this mobile for displaying the months; <tb> – <sep>Figure 8 illustrates their superposition during a March of an ordinary non-leap year, during which a hatched lower marking specific to an ordinary year is visible through the day of the March characters; <tb> – <sep>Figure 8 illustrates their superposition during an October of a leap year, during which a lower grid marking specific to a leap year is visible through the day of the October month characters; <tb> – <sep>Figure 10 illustrates a third variant, in which the month display unit has forty-eight equidistant month markings corresponding to the succession of months over four years, and one of the month markings, corresponding to the current month, is pointed to by a fixed marker on the dial, which is an index and / or a colored translucent glass; among these forty-eight month markings, twelve successive markings are leap year month markings, and are different from the other thirty-six markings which are ordinary year month markings; this figure illustrates a non-limiting example where the ordinary year month markings have month names in thin type, while the leap year month markings have thicker type, and where the current month of February of an ordinary year is visible under a colored translucent glass which itself faces a fixed index on the dial; <tb> – <sep>Figures 11 to 13 illustrate an example of a correction mechanism that can be used with each of these three variants: <tb> – <sep>Figure 11 represents, similarly to Figure 3, the entire month display mechanism of the first variant, and the cooperation of this month display mechanism with the control mechanism, and, in the vicinity of the stem at three o'clock, a month correction mechanism; <tb> – <sep>Figures 12 and 13, respectively in plan and perspective, illustrate the detail of a correction wheel, arranged to move a correction pinion attached to a correction star, which is arranged to drive the pins of the month display mobile, in the same way as the second star does at the end of the month; <tb> – <sep>Figure 14 is a block diagram representing a timepiece, in particular a watch, comprising a movement, a calendar mechanism with a date mechanism and its date corrector mechanism, and a month and leap year display mechanism according to the invention, with its month corrector. Detailed description of preferred embodiments
[0011] The invention relates to a month and leap year display mechanism 10 for a timepiece 1000. Figure 1 illustrates such a timepiece 1000, here a watch, which includes a traditional time display 1A by hour and minute hands, a date mechanism 200 with a date display 1B, a control rod 221 which drives in particular a date corrector 220, and a month and leap year display mechanism 10 according to the invention.
[0012] According to the invention, this mechanism 10 includes a leap year display integrated into a month display. The invention is described in the particular, non-limiting case of a display according to a Gregorian calendar, but it is perfectly suited to other types of calendars, in particular lunar or zodiacal, which those skilled in the art will be able to easily implement by substituting, for the display change control at the end of the month which will be described later, a display change control at the end of the lunar month, or at the end of any ad hoc period.
[0013] Depending on the configuration of the timepiece, either the mechanism 10 comprises a movement 100, or the mechanism 10 is arranged to cooperate with a movement 100. In either case, this movement 100 is arranged to drive a month display wheel 2, consisting in particular but not limited to a display ring or a display disc, via a control mechanism 3, which is included in the mechanism 10. This month display wheel 2 is arranged to rotate about an axis of rotation D, and is located under a cover plate or under a dial 1. This dial 1, or this cover plate, for example a bridge, or similar, includes a month aperture 1C, which is limited to an angular sector of 90° around the axis of rotation D.This window for month 1C is arranged to allow a user to see one quarter of the mobile display for month 2, while the other three quarters of the mobile display for month 2 are hidden from him, by dial 1 and / or at least a fixed part of the clockwork 100.
[0014] According to the invention, the control mechanism 3 is arranged to cause the month display wheel 2 to complete a full revolution in four years. Thus, the month display wheel 2 rotates one forty-eighth of a turn at the end of each month.
[0015] And this mobile display of the months 2 bears, on an angular sector of 90°, at least one marking characteristic of a leap year.
[0016] And the month display unit 2 carries either indexes, each of which is arranged to designate a month on a static month scale of the dial 1, or equidistant month markings, one of which is pointed to by a fixed marker of the dial 1.
[0017] The figures illustrate the construction of such a leap year display, which in this particular and non-limiting version comprises a cover plate, notably in the form of a dial 1, a month display wheel 2 which is a ring, or a disc carrying an annular display track, and a control and distribution mechanism 3. The month display wheel 2 is mounted to pivot about the axis of rotation D. The control mechanism 3, driven by the movement 100 or by a date mechanism 200, has the function of driving the month display wheel 2 by an angular step, at each change of month, and of returning this month display wheel 2 to a new rest position until its activation at the end of the new month.
[0018] In a first embodiment, and as shown in Figures 1 and 2, the month and leap year display mechanism 10 comprises a month window 1C opposite a static month scale 1D of the dial 1, which month scale 1D displays the names of the different months in succession. More specifically, the month scale 1D extends at a central angle of 90° to the axis of rotation D. The month display mechanism 2 comprises a display track, visible through the month window 1C, which has four equidistant indexes 2A or 2B, only one of which is visible at a time through the month window 1C and constantly points to a marker corresponding to the current month on the month scale 1D.Specifically, among the indexes, one is a leap year index (2A) and the other three are ordinary year indexes (2B). The leap year index (2A) has a visible marker indicating to the user that it is a leap year. This leap year index (2A), distinct from the other ordinary year indexes (2B), can thus be integrated into the month display. In the figures, these indexes are triangular, and the leap year index (2A) is marked with the letter S for Schaltjahr (leap year).
[0019] In a particular embodiment, the ordinary year indexes 2B are different from each other, each including a numerical indication, visible to the user, of the number of years remaining until the next leap year.
[0020] In another particular embodiment, the ordinary year indexes 2B are different from each other, each having a numerical indication, visible to the user, of the number of years elapsed since the last leap year.
[0021] In a second embodiment, and as shown in Figures 7 to 9, the month window 1C comprises a fixed, at least partially translucent glass 70 bearing twelve static, translucent upper markings 71, each corresponding to a month of a year. The month display mechanism 2 rotates beneath this glass 70. This month display mechanism 2 bears four lower markings 72A and 72B, which are equidistant and are revealing markings, in particular colored and / or reflective, each with the angular amplitude of a month marking 71. Each of the lower markings 72A or 72B is arranged to reveal the name of the current month by visual contrast with the upper markings 71 of the other months, through the effect of the local superposition of the lower marking 72A or 72B in question and the upper marking 71 of the current month.One of the lower markings 72 is a leap year lower marking 72A, and differs from the other lower markings 72, which are ordinary year lower markings 72B. It is arranged to produce a visual effect for the user for the current month that differs from the visual effects of other months of the year. The four lower markings 72A and 72B may consist of colored surfaces, differentiated between the leap year lower marking 72A and the ordinary year lower markings 72B, and visible through a cutout of the upper markings 71, or alternatively, of reflective surfaces of different colors, or other materials. The outline of the upper marking 71, in particular, leaves the surface of the display unit 2 visible, and only the name (or symbol) of the current month is thus revealed.Figures 7 to 9 illustrate a non-limiting example where the lower leap year marking 72A is gridded, and the lower ordinary year markings 72B have simple hatching; Figure 8 illustrates the visualization of a March in an ordinary year, while Figure 9 illustrates an October in a leap year. The glass 70 may, in a particular embodiment, be transparent only at the level of the upper markings 71, for example, within the letters of the month names, as illustrated by Figures 8 and 9.
[0022] In a third embodiment, and as shown in Figure 10, the month display wheel 2 has equidistant month markings 80 corresponding to the succession of months over four years, one of which is pointed to by a fixed marker 83 on the dial 1, which is an index 84 and / or a colored translucent glass 85. These month markings 80 consist of forty-eight month markings 81 and 82, of which twelve successive markings are leap year month markings 81, and are different from the other thirty-six markings 80, which are ordinary year month markings 82. Figure 10 illustrates a non-limiting example where the ordinary year month markings 82 have month names in thin type, while the leap year month markings 81 have thicker type, and where the current month is visible under a colored translucent ice 85 which itself faces an index 84.We understand that the mobile display for month 2 rotates by one forty-eighth of a turn at the end of each month.
[0023] With regard to the control mechanism 3, in a particular, non-limiting manner, and illustrated in Figures 3 to 6, this control mechanism 3 comprises an input wheel 31, which is arranged to be driven by the hour wheel of the movement 100 or by a gear train meshing with the hour wheel or by a date mechanism 200. This input wheel 31 comprises a finger 311, which is arranged to rotate a first star 321 integral with an intermediate wheel 32. This intermediate wheel 32 meshes with a transformation gear 33, to drive a stop wheel 34. The stop wheel 34 comprises recesses 34A, which are arranged to cooperate with a pawl 35 returned by a spring 352 to a rest position.This stop wheel 34 is integral with a second star 341, whose teeth 342 are arranged to drive pins 22, which comprise the display mobile of the months 2, when the stop wheel 34 pivots, and to hold these pins 22 in position when the stop wheel 34 is held in place by the ratchet 35 in the absence of pivoting of the first star 321.
[0024] The input shaft 31 rotates 1 / 31 of a turn at the end of each day; preferably, it is driven by a date mechanism 200, and, depending on the type of date mechanism (perpetual calendar or cancel calendar, in particular), this rotation typically takes 2 to 3 hours at the end of the day. The date mechanism performs the end-of-month adjustment.
[0025] More particularly, the input mobile 31 is integral with a wheel of such a calendar mechanism 200.
[0026] It is still conceivable, even if the interest is limited, that the month and leap year display mechanism 10 is independent of any date mechanism, it is then driven by a movement 100, and it is up to the user to make the end-of-month adjustment.
[0027] More specifically, the input mobile 31 is arranged to rotate the first star 321 once a month, on the last day of the month.
[0028] In the particular case of a lunar type calendar, the classic drive of a 59-tooth wheel makes it possible to trigger the pivoting of the first star 321 on the last day of a lunar month, for a display of a zodiacal or Muslim or Israelite or similar calendar.
[0029] More particularly, the stop wheel 34 has an alternation of hollows 34A and points 34B, and the intermediate wheel 32 and the transformation gear 33 are arranged to drive the stop wheel 34 by the angular pitch between two successive hollows 34A during each elementary rotation of the first star 321.
[0030] More specifically, each elementary rotation of the first star 321 causes a roller 351, which is part of the pawl 35, to move up a cam ramp between a recess 34A and a point 34B along a first part of the angular pitch, against the spring 352 to wind the latter. And this spring 352 is arranged so that, upon its winding after the point 34B has passed through the roller 351, it causes the stop wheel 34 to pivot along a second part of the angular pitch until it reaches a new rest position in which the roller 351 is wedged in a recess 34A until the end of the following month.
[0031] More specifically, each rotation of the stop wheel 34 controls a rotation of 1 / 48th of a turn of the mobile display of the months 2.
[0032] More specifically, each elementary rotation of the first star 321 causes a rotation of one quarter turn of the stop wheel 34.
[0033] In the non-limiting embodiment illustrated in the figures, during the transition from the last day of one month to the first day of the following month, the input wheel 31 drives the intermediate wheel 32, causing it to complete one-eighth of a turn. The transformation gear 33 is then arranged to rotate the stop wheel 34 by a quarter of a turn.
[0034] The stop wheel 34 is thus driven by the input wheel 31 and the transformation by the intermediate wheel and the transformation gear 33, by approximately a quarter turn. Of this 90° rotation, approximately 45° are used to disengage the pawl 35 and wind its spring 352, to the position shown in Figure 6. After the tip 34B passes through the roller 351, the spring 352 gives a brief push to the roller 351, which falls into the next recess 34A of the stop wheel 34, and this impulse causes the month display wheel 2 to pivot by one forty-eighth of a turn, to display the new month in the window 1C. Thus, the stop wheel 34 is constantly in contact with the pins 22 of the month display wheel 2.This stop wheel 34 rests on the ratchet 35 throughout the month, and it is only during the monthly movement of the input shaft 31 that the stop wheel 34 completes a total of one quarter turn between the last day of the previous month and the first day of the new month. The ratchet 35 also rests on a recess 34A in the stop wheel 34 throughout the month and is only moved along it during the monthly movement imparted by the input shaft 31.
[0035] Naturally other multiplication factors can be used without departing from the invention.
[0036] Advantageously, the display mechanism 10 further includes a month correction mechanism 20, which is arranged to modify the angular position of the display mobile of the months 2 on user command.
[0037] In one variant, this correction mechanism 20 includes a drive element 222 that can be operated directly by the user and arranged to directly drive the display mobile of the months 2, by meshing, friction, or magnetic cooperation.
[0038] In one variant, the correction mechanism 20 includes an actuator that can be operated directly by the user and is arranged to drive the stop wheel 34 in rotation.
[0039] Figures 11 to 13 illustrate a non-limiting example of such a month correction mechanism 20, which includes a user control mechanism, not shown, driving a correction wheel 21 which is arranged to move a correction pinion 24 attached to a correction star 23, which is arranged to drive the pins 22 of the month display wheel 2, in the same way as the second star 341 does at the end of the month; naturally this month correction mechanism 20 is dimensioned to be able to overcome, without deformation, the resisting force which is applied continuously by the spring 352 on this same second star 341.
[0040] Alternatively, the correction can be performed in a manner analogous to that of the day of the week for calendar watches displaying the day and date: in one of the positions of the stem 221, and in particular in position T2 of the stem, the date is corrected in a first direction of rotation, and the day of the week is corrected in a second direction of rotation opposite to the first. Within the scope of the invention, the correction would then be as follows: in position T2 of the stem, the date is corrected in a first direction of rotation, and the position of the month display wheel 2 is corrected in a second direction of rotation opposite to the first.
[0041] The invention further relates to a calendar mechanism 300, which includes a date mechanism 200 arranged to cooperate with a movement 100 of a timepiece 1000, this calendar mechanism 300 comprising at least one display mechanism 10 according to the invention. More specifically, this calendar mechanism 200 includes a gear train, which is arranged to count the number of days in the current month, and to control the rotation of the input wheel 31 by 1 / 31 of a turn from the first to the 27th of the month, and to control, on the last day of the current month, its rotation by 4 / 31 of a turn when the current month has 28 days, or by 3 / 31 of a turn when the current month has 29 days, or by 2 / 31 of a turn when the current month has 30 days, or by 1 / 31 of a turn when the current month has 31 days, so as to make the input wheel 31 complete a full turn during the current month.
[0042] More particularly, the date mechanism 200 includes a date display 1B, and the input mobile 31 is arranged to control the position of the date display 1B.
[0043] More particularly, the date mechanism 200 includes a date corrector 220 arranged to modify the position of the date display 1B.
[0044] More specifically, the date corrector 220 is further arranged to modify the angular position of the display mobile for the months 2.
[0045] The correction is described above for the case of the Gregorian calendar. A similar correction mechanism, controlled by the movement or by the user, can be implemented for other types of calendars, particularly lunar calendars, which require adjustments at certain times.
[0046] The invention further relates to a timepiece 1000 comprising at least one timepiece movement 100 arranged to drive at least one display mechanism 10, and / or to drive at least one calendar mechanism 300.
[0047] More specifically, this timepiece 1000 is a watch.
[0048] Naturally, the principle of the invention can be extended to other types of calendar timepieces, in particular astronomical watches or astronomical clocks, for which it is particularly possible to manage, according to the principle of the invention, the display of the years in addition to the display of the months, by distinguishing, on a year display unit, ordinary years, leap years, century years not divisible by 400 and not leap years which have a February of 28 days, and century years divisible by 400 and leap years called quadricentennial years, which have Februarys of 29 days, or even quadrimillennial years, which, although theoretically leap years, have a February of 28 days.
[0049] In summary, thanks to the present invention, it is possible to easily integrate into any timepiece a display that provides the user with information on whether it is a leap year, and / or, depending on the arrangement of the display markers, how many years remain until the next leap year, or since the last one. This allows the user to know the theoretical length of February and the number of days in the current year. The invention enables the correct adjustment of perpetual calendar mechanisms.
[0050] The invention allows for significant volume savings in the case of the timepiece concerned. Furthermore, no additional indicator area is required on the dial of the timepiece. The classic and essential displays for a wristwatch, such as the time and date, remain perfectly clear and legible, and prominently displayed.
[0051] The display is designed according to the principle of the Gregorian or Julian calendar, and is adaptable to any other type of calendar, including lunar. Furthermore, this display is not time-limited and does not lose its function upon expiry.
[0052] The display mechanism according to the invention is economical, as is its correction mechanism.< / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb> < / sep> < / tb>
Claims
1. A month and leap year display mechanism (10) for a timepiece (1000), characterized in that said mechanism (10) comprises a leap year display integrated into a month display, in that said mechanism (10) comprises a movement (100) or is arranged to cooperate with a movement (100), which movement (100) is arranged to drive, through a control mechanism (3) comprising said mechanism (10), a month display wheel (2) rotating about an axis of rotation (D) and disposed under a cover plate or under a dial (1), and in that a month window (1C) limited to an angular sector of 90° around said axis of rotation (D) is arranged to allow a user to see one quarter of said month display wheel (2), the other three-quarters of said month display wheel (2) being hidden from him,and further characterized in that said control mechanism (3) is arranged to make said month display wheel (2) complete a full revolution in four years, and in that said month display wheel (2) bears, on an angular sector of 90°, at least one leap year marking, and bears either indexes each arranged to designate a month on a static month scale of said dial (1), or equidistant month markings, one of which is pointed to by a fixed marker of said dial (1).
2. A month and leap year display mechanism (10) according to claim 1, comprising at least one cover plate or dial (1) having a month window (1C) opposite a month scale (1D), characterized in that said display mechanism (10) comprises a month display wheel (2) consisting of a disc or ring arranged to be driven indirectly by said movement (100) around an axis of rotation (D) and partially visible to the user in said month window (1C), characterized in that said month scale (1D) extends at a central angle of 90° with respect to said axis of rotation (D), in that a control mechanism (3) is arranged to make said display wheel (2) complete one revolution in four years,and in that said month display unit (2) comprises a display track visible through said month window (1C) and which comprises four equidistant indexes, only one of which is visible at a time through said month window (1C) and permanently points to a marker corresponding to the current month on said month scale (1D), and characterized in that among said indexes, one is a leap year index (2A) and the other three are ordinary year indexes (2B), said leap year index (2A) having a visible mark indicating to the user that it is a leap year.
3. Display mechanism (10) according to claim 1 or 2, characterized in that said month display mobile (2) is a display ring or disc, which carries indexes arranged to designate a month on a static month scale (1D) of said dial (1), said indexes being made up of four equidistant indexes (2A; 2B), only one of which at a time is visible through said window (1C), said indexes being arranged to point to the current month on a month scale (1D) of said dial (1), and in that, among said four indexes (2A; 2B), a leap year index (2A) is different from the other ordinary year indexes (2B), and can be integrated into the month display.
4. Display mechanism (10) according to claim 3, characterized in that said ordinary year indices (2B) are different from each other, each having a numerical indication, visible to the user, of the number of years remaining until the next leap year.
5. Display mechanism (10) according to claim 3, characterized in that said ordinary year indices (2B) are different from each other, each having a numerical indication, visible to the user, of the number of years elapsed since the last leap year.
6. Display mechanism (10) according to claim 1, characterized in that said month window (1C) comprises a glass (70) at least partially translucent bearing twelve upper translucent markings (71) of the months of a year and under which glass (70) rotates said month display mobile (2) which bears four equidistant and coloured and / or reflective lower markings (72), each of the angular amplitude of a month marking and arranged to reveal the name of the current month by visual contrast with the upper markings (71) of the other months, wherein one of said lower markings (72) is a lower leap year marking (72A), and is different from the other lower markings (72) which are lower ordinary year markings (72B), and is arranged to produce, for the current month, a visual effect for the user which is different from the visual effects of the other months of the year.
7. Display mechanism (10) according to claim 1, characterized in that said month display mobile (2) has equidistant month markings (80) corresponding to the succession of months over four years and of which one of said month markings (80) is pointed by a fixed marker (83) of said dial (1) which is an index (84) and / or a colored translucent glass (85), said month markings (80) being made up of forty-eight month markings (81; 82), among which twelve successive markings are leap year month markings (81), and are different from the thirty-six other markings (80) which are ordinary year month markings (82).
8. Display mechanism (10) according to any one of claims 1 to 7, characterized in that said control mechanism (3) comprises an input wheel (31) which is arranged to be driven by the hour wheel of said movement (100) or by a gear train meshing with said hour wheel or by a date mechanism (200), said input wheel (31) comprising a finger (311) arranged to rotate a first star wheel (321) integral with an intermediate wheel (32) which meshes with a transformation gear train (33) to drive a stop wheel (34) which has recesses (34A) arranged to cooperate with a pawl (35) returned by a spring (352) to a rest position, said stop wheel (34) being integral with a second star wheel (341) whose teeth (342) are arranged to drive pins (22) which comprises said mobile display of the months (2) when said stop wheel (34) pivots,and to hold said pins (22) in position when said stop wheel (34) is held in place by said ratchet (35) in the absence of pivoting of said first star (321).
9. Display mechanism (10) according to claim 8, characterized in that said input mobile (31) is arranged to rotate said first star (321) once a month, on the last day of the month.
10. Display mechanism (10) according to claim 8 or 9, characterized in that said stop wheel (34) comprises an alternation of said hollows (34A) and points (34B), and in that said intermediate wheel (32) and said transformation gear (33) are arranged to drive said stop wheel (34) by the angular pitch between two successive said hollows (34A) during each elementary rotation of said first star (321).
11. Display mechanism (10) according to claim 10, characterized in that each elementary rotation of said first star (321) causes a roller (351) comprising said ratchet (35) to rise on a cam ramp between said hollow (34A) and said point (34B) on a first part of said angular pitch, against said spring (352) to wind it, and in that said spring (352) is arranged so that, when unwinding after the passage of said point (34B) by said roller (351), it causes said stop wheel (34) to pivot on a second part of said angular pitch until a new rest position in which said roller (351) is wedged in said hollow (34A) until the end of the following month.
12. Display mechanism (10) according to any one of claims 8 to 10, characterized in that each rotation of said stop wheel (34) controls a rotation of 1 / 48th of a turn of said month display mobile (2).
13. Display mechanism (10) according to any one of claims 8 to 12, characterized in that each elementary rotation of said first star (321) causes a rotation of one quarter turn of said stop wheel (34).
14. Display mechanism (10) according to any one of claims 1 to 13, characterized in that said display mechanism (10) comprises a month correction mechanism (20) arranged to modify the angular position of said month display mobile (2) on user command.
15. Display mechanism (10) according to claim 14, characterized in that said correction mechanism (20) comprises a drive element operable directly by the user and arranged to directly drive said month display mobile (2), by meshing, friction, or magnetic cooperation.
16. Display mechanism (10) according to claim 14 or 15, characterized in that said correction mechanism (20) comprises an actuator operable directly by the user and arranged to drive said stop wheel (34) in rotation.
17. Calendar mechanism (300) comprising a date mechanism (200) arranged to cooperate with a movement (100) of a timepiece (1000), said calendar mechanism (300) comprising at least one display mechanism (10) according to claim 8 and any one of claims 1 to 16, and said date mechanism (200) comprising a gear arranged to count the number of days in the current month, and to control the rotation of said input wheel (31) by 1 / 31 of a turn from the first to the 27th of the month, and to control, on the last day of the current month, its rotation by 4 / 31 of a turn when the current month has 28 days, or by 3 / 31 of a turn when the current month has 29 days, or by 2 / 31 of a turn when the current month has 30 days, or by 1 / 31 of a turn when the The current month has 31 days, so that the incoming mobile audit (31) can complete a full circuit during the current month.
18. Calendar mechanism (300) according to claim 17, characterized in that said date mechanism (200) comprises a date display (1B), and in that said input mobile (31) is arranged to control the position of said date display (1B).
19. Calendar mechanism (300) according to claim 17 or 18, characterized in that said date mechanism (200) comprises a date corrector (220) arranged to modify the position of said date display (1B).
20. Calendar mechanism (300) according to claim 19, characterized in that said date corrector (220) is further arranged to modify the angular position of said month display mobile (2).
21. Timepiece (1000) comprising at least one timekeeping movement (100) arranged to drive at least one display mechanism (10) according to any one of claims 1 to 16, and / or to drive at least one calendar mechanism (300) according to any one of claims 17 to 20.
22. Timepiece (1000) according to claim 21, characterized in that said timepiece (1000) is a watch.