MECHANISM FOR DISPLAYING MOON PHASES FOR CLOCK

Description

Technical field of the invention

[0001] The field of the invention relates to the mechanisms for displaying the phases of the moon in timepieces, enabling the display of information relating to the state of the moon during a complete lunar period.

[0002] The invention also relates to a watch movement comprising such a moon phase display mechanism.

[0003] The invention also relates to a timepiece, for example a wristwatch, comprising a watch movement including such a moon phase display mechanism. Technological background

[0004] Moon phase display mechanisms show information about the moon's state during a lunar cycle. This theoretical lunar cycle lasts precisely 29 days, 12 hours, 44 minutes, and 2.8 seconds.

[0005] The most common moon phase display mechanisms are mechanisms with a jumping drive of a 59-tooth star carrying a disc with two representations of the moon, part of this disc being visible to the user through a suitably shaped opening in the dial of the watch and successively revealing the different phases of the moon: a waxing moon, a full moon, a waning moon and a new moon.

[0006] The 59-toothed star is driven once a day by a 24-hour wheel. This moon phase display mechanism provides a period of 29.5 days per displayed lunar month, resulting in an approximate reading with a reliable, compact, and inexpensive mechanism. However, this mechanism accumulates an error with each lunar month that must be corrected every 2.65 years by a correction device.

[0007] The search for more precise moon phase display mechanisms is a constant in the field of watchmaking.

[0008] Most known moon phase display mechanisms aim to improve the accuracy of the lunation by getting as close as possible to the theoretical value of a lunar period, using a multitude of precise mechanisms and gear ratios to get as close as possible to the theoretical value of a lunation.

[0009] Thus, there are known mechanisms for displaying moon phases, of the jumping type, which are more complex and allow for a lunar cycle of 29.53125 days, which reduces the correction to one day every 122.4 years.

[0010] There are also trailing moon phase display mechanisms that further increase the accuracy of a lunar cycle, reducing the correction to one day every 292 and 279 years, or even one day every 1866 years with complex and very bulky mechanisms.

[0011] The dragging type of moon phase display mechanism has the advantage of allowing a more precise real-time display of the moon's position relative to the lunar surface throughout the day. Indeed, with this type of mechanism, the moon is carried along continuously throughout the day, unlike a jumping type display mechanism where the moon disk is moved in a single jump once a day.

[0012] Therefore, the jump-based display mechanism introduces a "display error" in the moon's position relative to the lunar orb, which is constantly changing throughout the day. This inherent "display error" represents a maximum cumulative error of 6.1° per day, regardless of the lunar phase display mechanism's accuracy, however complex it may be.

[0013] Document EP 2728420 describes an astronomical watch with a three-dimensional display mechanism showing the day and the phase of a celestial body, such as the moon. The mechanism includes a drive cam with an upper section rotated by the movement's bearing, a rocker arm with a roller to contact the cam, and a ratchet to engage a toothed wheel for driving the moon phase. In the document, the moon is rotated four times a day through an angle of 3°. Summary of the invention

[0014] In this context, the invention proposes a jumping moon phase display mechanism with improved display resolution compared to prior art moon phase display mechanisms, allowing jumping moon phase display mechanisms to reduce this "display error", to be more faithful to reality and to get closer to the state of the lunar orb without complicating the display mechanism and by freeing oneself from a costly, bulky, complex to manufacture and implement trailing display mechanism.

[0015] To this end, the invention relates to a moon phase display mechanism for a timepiece suitable for being powered by a timepiece movement whose operation depends on the division of time, said moon phase display mechanism having the characteristics of claim 1.

[0016] In addition to the features mentioned in the preceding paragraph, the moon phase display mechanism according to the invention may have one or more additional features from the following, considered individually or in all technically possible combinations: The jumping drive mechanism comprises: a cam having an upper zone forming a drive finger, said cam being capable of being driven by the clockwork movement; a phase rocker mounted pivoting about a pivot axis, said phase rocker having at one of its ends a feeler sensing the movements of the cam and having at the other of its ends a correction beak driving said moon phase indicator at each passage of the upper zone of the cam; the cam is driven in rotation so as to complete a full rotation in 12 hours and the cam has a single upper zone forming a drive finger configured to pivot the phase rocker and drive said moon phase indicator twice a day;The cam is animated in rotation so as to complete a full rotation in 24 hours and the cam has two upper zones opposite each other at 180° forming two drive fingers configured to rotate said phase rocker and drive said moon phase indicator twice a day; said moon phase display mechanism is configured to achieve a lunar period of 29.53125 days and the moon phase indicator is incremented twice a day by an angle of 3.05° so as to achieve a daily rotation of 6.1°; the cam is animated in rotation so as to complete a full rotation in 12 hours and the cam has two upper zones opposite each other at 180° forming two drive fingers configured to rotate the phase rocker and drive said moon phase indicator four times a day;said moon phase display mechanism being configured to achieve a lunar period of 29.53125 days and in that the moon phase indicator is incremented four times a day by an angle of 1.525° so as to achieve a daily rotation of 6.1°; The jumping drive mechanism includes an intermediate phase drive wheel rotated by the phase tilt, said intermediate phase drive wheel meshing with the moon phase indicator; the intermediate phase drive wheel includes a phase drive star configured to be rotated by the phase tilt, and a phase drive pinion rotationally fixed to the phase drive star, said phase drive pinion meshing with a phase wheel included in the moon phase indicator; the jumping drive mechanism includes a jumper cooperating with the intermediate phase drive wheel to index and maintain the position of said intermediate phase drive wheel between each increment;The moon phase display mechanism includes a user-activated quick-correction device for correcting the position of the moon phase indicator; the quick-correction device includes a correction star mounted on the intermediate phase drive wheel and configured to be driven by a phase correction control; the phase wheel has 109 teeth, the phase drive pinion has 16 teeth, and the phase drive star has 18 teeth; said correction star has 9 teeth; the moon phase display mechanism includes a safety device for disengaging the jumping drive mechanism when a quick-correction action via said quick-correction device occurs simultaneously with the driving of the moon phase indicator by the jumping drive mechanism.

[0017] The invention also relates to a clock movement comprising a moon phase display mechanism according to the invention.

[0018] Advantageously, the clockwork movement includes a timer wheel, an hour wheel, and a minute center pinion, said moon phase display mechanism including a cam having a high area forming a drive finger, said cam being driven by the rotation of the hour wheel.

[0019] Advantageously, the cam is positioned coaxially with the hour wheel and mounted to rotate freely relative to the hour wheel.

[0020] Advantageously, the cam includes an indexing element extending towards the hour wheel and the hour wheel has a slot configured to receive the indexing element, said slot forming stops limiting the relative rotation of the cam with respect to the hour wheel.

[0021] The invention also relates to a timepiece comprising a moon phase display mechanism according to the invention or comprising a clockwork movement according to the invention.

[0022] Advantageously, the timepiece is a wristwatch. Brief description of the figures

[0023] The aims, advantages and features of the present invention will become apparent from the detailed description below, which refers to the following figures: there figure 1 illustrates a perspective view of an example embodiment of a moon phase display mechanism according to the invention; the figure 2 illustrates a top view of the example implementation of the moon phase display mechanism shown in the figure 1 ; there figure 3 illustrates a bottom view of the example implementation of the moon phase display mechanism shown in the figure 1 ; there figure 4illustrates in perspective a portion of a jumping drive mechanism of the moon phase display mechanism according to the invention.

[0024] In all figures, common elements bear the same reference numbers unless otherwise specified. Detailed description of the invention

[0025] The present invention consists in the general idea of ​​fractionating the daily training step of the moon phase indicator of a jumping type moon phase display mechanism, in order to improve the display resolution of the moon phase indicator and to get as close as possible to the actual state of the lunar orb during the day.

[0026] In this application, "daily step" means the daily angular step achieved by a moon phase indicator as a function of the approximate lunar period of the moon phase display mechanism.

[0027] There figure 1illustrates a perspective view of an example of an embodiment of a moon phase display mechanism 100 according to the invention.

[0028] There figure 2 illustrates a top view of the example implementation of the moon phase display mechanism 100 shown in the figure 1 , and the figure 3 illustrates a bottom view of this same example of implementation.

[0029] The moon phase display mechanism 100 according to the invention is a jumping type display mechanism, meaning that the moon phase indicator bearing the moon representations is not in constant contact with the gear train of a clockwork movement. Thus, such a mechanism is completely different, both functionally and structurally, from a trailing type moon phase display mechanism in which the moon phase indicator is constantly in contact with, and driven by, the gear train of the clockwork movement.

[0030] The moon phase display mechanism 100 according to the invention is intended to be housed in a timepiece, for example a wristwatch case (not shown).

[0031] The moon phase display mechanism 100 according to the invention is powered by a clockwork movement 200, partially shown on the figures 1 to 3 that is to say, a mechanism whose operation depends on the division of time.

[0032] More specifically, the clock movement 200 includes in particular a timer mobile 210 comprising a timer pinion 211 and a timer wheel 212. The timer pinion 211 drives an hour wheel 220, and the assembly is configured so that the hour wheel 220 makes a complete revolution in 12 hours.

[0033] In the example of implementation illustrated in figures 1 to 3The hour wheel 220 is at the center of the clockwork mechanism 200, and thus forms the center wheel. The hour wheel 220 has a cylindrical section 222 carrying an hour hand (not shown). A minute hand (not shown) is carried by a bearing 231 on a minute center pinion 230 mounted coaxially with the hour wheel 220. The minute center pinion 230 meshes with the minute wheel 210, and more specifically with the minute wheel 212.

[0034] The moon phase display mechanism 100 includes a moon phase indicator 110, at least part of which is intended to be visible to the user through a suitably shaped opening in a dial of the timepiece (not shown), so as to reveal successively the different phases of the moon: a waxing moon, a full moon, a waning moon and a new moon.

[0035] The moon phase indicator 110 is set in motion by a jumping drive mechanism 120 animated at regular intervals by the clockwork movement 100 and / or by a user via a quick correction device 300.

[0036] The moon phase indicator 110 features at least one representation of the moon. In the example shown, the moon phase indicator 110 includes two representations of the moon.

[0037] In the embodiment shown, the moon phase indicator 110 is formed by an upper disc 111 bearing the two representations of the moon. The upper disc 111 is mounted integrally with a phase wheel 112 having a plurality of teeth.

[0038] The jumping drive mechanism 120 includes a phase drive element directly driven by the rotation of the hour wheel 220. The phase drive element cooperates with a phase rocker 130 which is pivotally mounted around a pivot axis 2. The phase rocker 130 pivots under the action of the phase drive element so as to interact with the moon phase indicator 110 and to drive it in rotation with each rocker of the phase rocker 130.

[0039] In the example of implementation illustrated in figures 1 to 3 The phase drive element is formed by a cam 121 driven directly by the clockwork movement 200. More specifically, the cam 121 is driven in rotation directly by the hour wheel 220 and is mounted coaxially with the hour wheel 220.

[0040] In this first example of implementation, the cam 121 is interposed between the hour wheel 220 and the center pinion 230; however, other assemblies are also envisaged.

[0041] There figure 4 It particularly illustrates cam 121, which acts as a phase drive element, mounted coaxially with the hour wheel 220 and the center pinion 230. In this figure 4 The hour wheel 220 is not shown in order to better visualize the cam 121 and its interaction with the phase rocker 130.

[0042] The cam 121 is mounted to rotate freely around the rotation axis 6 of the hour wheel 220.

[0043] The cam 121 defines an outer profile 123 constituting a probing profile configured to interact with the phase rocker 130. The outer profile 123 has an upper probing area which is radially the area furthest from the axis of rotation 6 of the hour wheel 220. This upper probing area forms a drive finger 124 configured to come into contact with the phase rocker 130 and to rock it when the cam 121 rotates.

[0044] At the level of this drive finger 124, the cam 121 has a pin 125, or other indexing element, projecting from the upper surface of the cam 121, so that the pin 125 extends in the direction of the hour wheel 220 located above the cam 121, so as to cooperate with the hour wheel 220.

[0045] The pin 125 is configured to insert and cooperate with a slot 221 provided in the body of the hour wheel 220. The slot 221, defined by its shape, has stops that limit the relative rotation of the cam 121 with respect to the hour wheel 220. Thus, when the pin 125, which is fixed to the cam 121, comes to rest against the peripheral edges of the slot 221, the hour wheel 220 causes the cam 121 to rotate.

[0046] The relative rotation of the cam 121 with respect to the hour wheel 220 makes it possible in particular to avoid stressing the hour wheel 220 when the phase rocker 130 returns to its rest position under the elastic force of elastic means 150.

[0047] Here, in the example of implementation illustrated in figures 1 to 4, cam 121 is a 12 o'clock cam since it has only one drive finger and makes a complete rotation in 12 hours in the same way as the rotation of the hour wheel 220.

[0048] Of course, other embodiment examples are envisaged, in particular it is planned to use intermediate wheels and ratios different from 1 with respect to the hour wheel 220 and / or a cam profile having a plurality of high zones forming drive fingers 124 to increase the number of tilting of the phase rocker 130 during a turn of the hour wheel 220, i.e. in 12 hours.

[0049] The phase rocker 130 is pivotally mounted around a pivot axis 2 and is rocked between a rest position and an activation position by the passage of the drive finger 124 of the cam 121.

[0050] As illustrated in figures 3 and 4The phase rocker 130 includes a first arm 131 having at its end a feeler 132 configured to cooperate with the drive finger(s) 124 of the cam 121. More particularly, the phase rocker 130 rocks with each passage of a drive finger during the rotation of the cam 121 driven by the hour wheel 220.

[0051] The phase switch 130 further includes a second arm 133 which has at its end a correction beak 134 configured to drive the moon phase indicator 110 in rotation at each switch of the phase switch 130.

[0052] The phase rocker 130 cooperates with elastic return means 150, for example a return spring, tending to position the phase rocker 130 in the rest position between each rocker.

[0053] For example, the phase rocker 130 is repositioned against a positioning stop (not shown) which defines the rest position of the phase rocker 130. Such a positioning stop makes it possible, for example, to avoid permanent contact of the probe 132 on the outer profile 123 of the cam 121. Thus, contact between the different parts is minimized and wear on the parts is reduced.

[0054] The operation of the moon phase display mechanism 100 according to the invention is as follows: the hour wheel 220 rotates clockwise, conventionally driven by the timer wheel 210.

[0055] With each rotation of the hour wheel 220, the drive finger 124 of the cam 121, constrained by the rotation of the hour wheel 220, via the pin 125 and the light 221, comes into contact with the feeler 132 of the phase rocker 130. The shapes and geometries of the drive finger 124 of the cam 121 and the feeler 132 of the phase rocker 130 are configured to ensure the pivoting of the phase rocker 130 during the rotation of the cam 121 until its activation position, allowing the moon phase indicator 110 to be incremented and angularly offset.

[0056] The moon phase display mechanism 100 according to the invention is configured so that the jumping drive mechanism 120 rotates the moon phase indicator 110 by n increments per day, n being greater than 1, each increment rotating the moon phase indicator 110 by an angle α corresponding to the rotation angle of one daily step divided by the number n of increments.

[0057] For example, with the use of a 12 o'clock cam, the moon phase indicator 110 is incremented twice a day instead of only once a day as with prior art jumping type display mechanisms.

[0058] The various gears are sized so that the overall rotation of the moon phase indicator 110 over a day remains identical to the daily step of a classic moon phase indicator set in motion by a jumping drive mechanism of the prior art.

[0059] Thus, for a moon phase display mechanism 110 configured to obtain a lunar period of 29.53125 days, the moon phase indicator 110 according to the invention will be set in motion twice a day (every 12 hours) by an angle α of 3.05° to achieve a daily step corresponding to a rotation of 6.1°.

[0060] Of course, it is also envisaged to further reduce the display resolution of the moon state of the moon phase display mechanism according to the invention, and thus increase the number of increments per day of the moon phase indicator 110 while decreasing the angular jump of each increment, without further complicating the jumping drive mechanism 120.

[0061] This is possible for example by multiplying the number of drive fingers 124 on the outer profile 123 of the cam 121, in order to switch the phase rocker 130 several times per turn of the hour wheel 220, while configuring the different gears so that the overall rotation over a day of the moon phase indicator 110 remains identical to the daily drive step, here of 6.1° for a lunation of 29.53125 days.

[0062] For example, the cam 121 may have two opposing drive fingers 124 (i.e., 180° apart), so that the phase indicator 130 is tilted twice per revolution of the hour wheel 220, or four times a day. Thus, the various gears are sized so that each increment of the moon phase indicator 110, occurring here every six hours, corresponds to a rotation of an angle α of 1.525° of the moon phase indicator 110, thereby maintaining an overall rotation of 6.1° per day, corresponding to the daily increment.

[0063] Such a variant allows for further improvement in the accuracy of displaying the state of the moon over a day compared to the lunar orb, although the daily step is still 6.1°.

[0064] In the example of implementation illustrated in figures 1 to 4The hour rocker 130 does not cooperate directly with the phase wheel 112. Indeed, the jumping drive mechanism 120 includes an intermediate phase drive mobile 140 located between the phase rocker 130 and the moon phase indicator 110, and more particularly the phase wheel 112.

[0065] According to an alternative embodiment not shown, it is also envisaged that the tilting of phases 130 directly drives the wheel of phases 112, without the use of an intermediate mobile for driving the phases.

[0066] More specifically, the intermediate phase drive unit 140 includes a phase drive star 141 which is rotationally fixed to a phase drive pinion 142 which meshes with the phase wheel 112 of the moon phase indicator 110.

[0067] The phase drive star 141 cooperates with a jumper 160 configured to hold the phase drive star 141 in position between each jump (or increment) of the phase drive star 141 operated by the phase flipper 130.

[0068] The jumper 160 is mobile around a pivot axis 4 and cooperates conventionally with an elastic means 161 tending to position the jumper 161 between two teeth of the drive star of the phases 141, once the high point of a tooth has passed under the action of the tilting of the phases 130.

[0069] Advantageously, the jumper 160 does not act directly on the phase wheel 112 but on the intermediate phase drive wheel 140, and more particularly on the phase drive star 141. The use of such an architecture makes it possible in particular to absorb the inertia of a large moon phase indicator 110.

[0070] The moon phase display mechanism 100 according to the invention further includes an independent rapid correction device 300 allowing the position of the moon phase indicator 110 to be corrected if necessary, for example after a prolonged stop of the clock movement 200.

[0071] The rapid correction device 300 includes a correction star 330 carried by the intermediate phase drive mobile 140, and rotationally fixed to the phase drive pinion 142, so that an action on the correction star 330 causes a rotation of the moon phase indicator 110.

[0072] The rapid correction device 300 further includes a phase correction control 315 which can be operated by a user via a push button, or an actuation pin 316. The phase correction control 315 is mounted to pivot about a pivot axis 5.

[0073] The phase correction control 315 cooperates with an intermediate phase correction rocker 320 mounted pivotally about a pivot axis 3. The intermediate phase correction rocker 320 has a correction beak 321 intended to cooperate with a tooth of the correction star 330 when the phase correction control 315 is activated by the user.

[0074] The quick correction device 300 includes an elastic means 310 configured to reposition the phase correction control 315 and the intermediate phase correction rocker 320 into neutral rest positions when the user is not acting on the phase correction control 315.

[0075] In the illustrated embodiment, the elastic means 310 is supported on the intermediate phase correction rocker 320. However, the elastic means 310 can be supported on the phase correction control 315.

[0076] According to one embodiment, the phase correction control 315 can act directly on the phase correction star 330, so that it is possible to eliminate the intermediate phase correction flipper 320.

[0077] In the illustrated example: the cam is a 12 o'clock cam activating the phase switch 130 every 12 hours, i.e. at each rotation of the hour wheel 220; the phase wheel 112 has 105 teeth; the phase drive pinion meshed with the phase wheel 112 has 16 teeth; the phase drive star 141 has 18 teeth; the correction star has 9 teeth (i.e. half as many teeth as the phase drive star 141).

[0078] Thus, the gear ratio from the hour wheel 220 is 105*9 / 16 = 59.0625, which corresponds to a lunar period of 29.53125 since the phase indicator 110 has two representations of the moon.

[0079] In this configuration, the moon phase indicator 110 is incremented twice a day by an angle of 3.05° in order to achieve a daily rotation of 6.1°.

[0080] In the example of implementation illustrated in figures 1 to 4The 330 correction star has the advantage of having half the teeth of the 140 phase drive star, since the latter is incremented twice a day. Thus, the 300 rapid correction device allows for corrections equivalent to one day of training (not daily). This configuration advantageously avoids disrupting the wearer's routine, as they are accustomed to performing a one-day correction each time the correction command is activated.

[0081] Given that the correction star 330 has 9 teeth and the phase drive star 141 has twice as many teeth, the correction star 330 can have two different indexing positions depending on the position of the phase drive star 141 relative to its jumper 160. Thus, for the two indexing positions of the correction star 330, the distance between a tooth of the correction star 330 and the correction beak is different, and therefore the action of the correction beak of the intermediate rocker is different depending on the indexing position of the correction star 330.

[0082] Depending on the time of day when the rapid correction occurs, and therefore depending on the indexing position of the correction star 330, the actuation of the correction control 315 can advance the correction star 330 by a full daily step (here a rotation of 6.1°), at each actuation of the correction control 315, or first by half a daily step, i.e. a rotation of 3.05° (in the case of two indexings per day of the drive star of the phases 141 and if the first indexing in the first twelve hours of the day is carried out), then by a full daily step (rotation of 6.1°) at each actuation of the correction control 315.

[0083] The moon phase display mechanism 100 also includes a safety device 180 which allows the jumping drive mechanism 120 to be disengaged during a rapid correction by the user, via the rapid correction device 300 which acts on the same intermediate phase drive unit 140. The safety device 180 allows the jumping drive mechanism 120 to be disengaged when a rapid correction action occurs simultaneously with the drive of the moon phase indicator 110 by the phase flip 130.

[0084] For example, as illustrated in figures 1 to 4 , the safety device 180 is formed by a ratchet provided on the phase switch 130.

[0085] In particular, the ratchet is provided at the level of the second arm 132 so that the correction beak 134, cooperating with the intermediate drive mobile of the phases 140, is located at the end of an elastic strand 181 capable of disengaging when a correction action is initiated by the user via the rapid correction device 300 causing a rotation of the intermediate drive mobile of the phases 140.

[0086] Thus, when the correction beak 134 is in contact with the intermediate drive wheel of the phases 140 and a simultaneous rapid correction action is engaged, the elasticity of the elastic strand 181 allows the correction beak to be released from its engagement with the drive wheel of the phases 141 and to allow rotation of the intermediate drive wheel of the phases 140 without risk of breakage or degradation of the jumping drive mechanism 120.

[0087] In the example implementation described in figures 1 to 4 The cam forming the phase drive element is coaxial with the hour wheel 220. However, other embodiments are possible.

[0088] For example, the cam forming the phase drive element can be carried by an intermediate wheel directly meshed with the hour wheel 220.

[0089] The intermediate wheel can be configured to have a ratio of 1 with the 220 hour wheel or a different ratio than 1.

[0090] For example, by decreasing the ratio between the hour wheel 220 and the intermediate wheel it is possible to increase the display resolution of the moon phase indicator 110 over a day as described previously, i.e. increase the number of increments of the moon phase indicator 110 while decreasing the angular jump of each increment to respect the overall rotation over a day corresponding to the daily angular step corresponding to the lunar period of the moon phase display mechanism 100.

[0091] For example, with a ratio of 0.5 between the hour wheel 220 and the intermediate wheel carrying the cam, the intermediate wheel completes one revolution in 6 hours, or two revolutions in 12 hours. Thus, with a cam having a single drive finger, it is possible to divide the daily angular step of the moon phase indicator 110 into four increments distributed throughout the day, i.e., every 6 hours.

[0092] With this same ratio of 0.5 between the hour wheel 220 and the intermediate phase drive wheel and with a cam carrying two opposing drive fingers at 180°, it is then possible to divide the daily angular step of the moon phase indicator 110 into eight increments distributed throughout the day, i.e. every 3 hours.

[0093] Of course, whatever embodiment is chosen, the gear ratios between the phase wheel 112, the phase drive pinion 142, and the phase drive star 141 will be adapted to divide the overall daily rotation of the moon phase indicator 110 corresponding to the daily step according to the number of increments desired.

[0094] Of course, it is also possible to use one or more intermediate links between the hour wheel 23 and the phase drive wheel 110 depending on the needs.

[0095] According to another embodiment, the phase drive element can be formed by several superimposed cams interacting in phase flippers positioned on different levels of the mechanism, in order to multiply the increments of the moon phase indicator 110 over a day.

[0096] The invention also relates to a watch movement 200 comprising a moon phase display mechanism 100 according to the invention.

[0097] The invention also relates to a timepiece, such as a wristwatch, comprising a 200-hour clock movement according to the invention.

Claims

1. Moon phase display mechanism (100) for a timepiece capable of being driven by a horological movement (200), the operation whereof depends on the time division, said moon phase display mechanism (200) comprising: - a moon phase indicator (110) carrying at least one representation of the moon; - a jumping drive mechanism (120) of the moon phase indicator (110) capable of being driven by said horological movement (100) and of driving, in jumps, the moon phase indicator (110); the jumping drive mechanism (120) being configured to rotate said moon phase indicator (110) by n increments per day, n being greater than 1, each increment rotating the moon phase indicator (110) by an angle α corresponding to the angle of rotation of a daily pitch divided by the number n of increments; the jumping drive mechanism (120) comprising : - a cam (121) comprising an upper area forming a driving finger-piece (124), said cam (121) being capable of being driven by the horological movement (200); - a phase lever (130) mounted such that it pivots about a pivot axis (2), said phase lever (130) comprising, at one of the ends thereof, a feeler (132) sensing the movements of the cam (121) and comprising, at the other end thereof, a correction beak (134) driving said moon phase indicator (110) upon each passage of the upper area of the cam (121); - a phase-driving intermediate wheel set (140) rotated by the phase lever (130), said phase-driving intermediate wheel set (140) meshing with the moon phase indicator (110); characterised in that said phase-driving intermediate wheel set (140) comprises a phase-driving star-wheel (141) configured to be rotated by the phase lever (130), and a phase-driving pinion (142) integral with the phase-driving star-wheel (141) such that it rotates therewith, said phase-driving pinion (142) being meshed with a phase wheel (112) comprised in the moon phase indicator (110).

2. Moon phase display mechanism (100) for a timepiece according to claim 2, characterised in that the cam (121) is rotated so as to make one complete rotation in 12 hours and in that the cam (121) comprises a single upper area forming a driving finger-piece configured to pivot the phase lever (130) and drive said moon phase indicator (110) twice a day.

3. Moon phase display mechanism (100) for a timepiece according to claim 2, characterised in that the cam (121) is rotated so as to make one complete rotation in 24 hours and in that the cam (121) comprises two opposite upper areas at 180° from one another, forming two driving finger-pieces (124) configured to pivot said phase lever (130) and drive said moon phase indicator (110) twice a day.

4. Moon phase display mechanism (100) for a timepiece according to one of claims 3 or 4, characterised in that said moon phase display mechanism (100) is configured to procure a lunation period of 29.53125 days and in that the moon phase indicator (110) is incremented twice a day by an angle of 3.05° so as to procure a daily rotation of 6.1°.

5. Moon phase display mechanism (100) for a timepiece according to claim 2, characterised in that the cam (121) is rotated such that it makes a complete rotation in 12 hours and in that the cam comprises two opposite upper areas at 180° from one another, forming two driving finger-pieces (124) configured to pivot the phase lever (130) and drive said moon phase indicator (110) four times a day; said moon phase display mechanism (100) being configured to procure a lunation period of 29.53125 days and in that the moon phase indicator (110) is incremented four times a day by an angle of 1.525° so as to procure a daily rotation of 6.1°.

6. Moon phase display mechanism (100) for a timepiece according to claim 5, characterised in that the jumping drive mechanism (120) comprises a jumper (160) cooperating with the phase-driving intermediate wheel set (140) for indexing and holding said phase-driving intermediate wheel set (140) in position between each increment.

7. Moon phase display mechanism (100) for a timepiece according to one of claims 1 to 6, characterised in that said moon phase display mechanism (100) comprises a quick correction device (300) that can be activated by the user to correct the position of the moon phase indicator (110).

8. Moon phase display mechanism (100) for a timepiece according to claim 7, characterised in that said quick correction device (300) comprises a correction star-wheel (330) carried by the phase-driving intermediate wheel set (140) and configured to be driven by a phase correction control (315).

9. Moon phase display mechanism (100) for a timepiece according to one of claims 1 to 5, characterised in that said phase wheel (112) has 109 teeth, the phase-driving pinion (142) has 16 teeth and in that the phase-driving star-wheel (141) has 18 teeth.

10. Moon phase display mechanism (100) for a timepiece according to claims 8 and 9, characterised in that said correction star-wheel (330) has 9 teeth.

11. Moon phase display mechanism (100) for a timepiece according to one of claims 7 to 10, characterised in that the moon phase display mechanism (100) comprises a safety device (180) for disconnecting the jumping drive mechanism (120) when a quick correction action, via said quick correction device (300), occurs at the same time as the moon phase indicator (110) is being driven by the jumping drive mechanism (120).

12. Horological movement (200) comprising a moon phase display mechanism (100) according to one of claims 1 to 11.

13. Horological movement (200) according to claim 12, characterised in that it comprises a motion-work (210), an hour wheel (220), and a minute centre pinion (230), said moon phase display mechanism (100) comprising a cam (121) that comprises an upper area forming a driving finger-piece (124), said cam (121) being driven by the rotation of the hour wheel (220).

14. Horological movement (200) according to claim 13, characterised in that the cam (121) is positioned coaxially with the hour wheel (220) and mounted to rotate freely relative to the hour wheel (220).

15. Horological movement (200) according to claim 14, characterised in that the cam (121) comprises an indexing element (125) extending towards the hour wheel (220) and in that the hour wheel (220) has a slot (221) configured to receive the indexing element (125), said slot (221) forming bankings limiting the relative rotation of the cam (121) to the hour wheel (220).

16. Timepiece comprising a moon phase display mechanism (100) according to one of claims 1 to 11 or comprising a horological movement (200) according to one of claims 12 to 15.

17. Timepiece according to the preceding claim, characterised in that said timepiece is a wristwatch.