Mechanism for displaying the phases of the moon and the day of the week

Abstract

A mechanism for displaying the phases of the moon and the day of the week (1) intended to be driven step by step by a clockwork movement of a timepiece, the mechanism for displaying the phases of the moon and the day of the week (1) comprising a moon phase display mechanism (2), a day of the week display mechanism (3) and a one-way clutch mobile (4) kinematically linking the moon phase display mechanism (2) and the day of the week display mechanism (3) such that when, in normal operation, one of the moon phase display mechanisms (2) or the day of the week display mechanism (3) is advanced by one step in a direction of travel it drives the other of the day of the week display mechanism (3) or the moon phase display mechanism (2) via the one-way clutch mobile (4) to advance it by one step,and that when at least one of the moon phase display mechanism (2) or the day of the week display mechanism (3) is advanced by one step in at least one direction, it does not cause the other of the day of the week display mechanism (3) or the moon phase display mechanism (2) to advance.

Description

[0001] The present invention relates to a mechanism for displaying the phases of the moon and the day of the week in a timepiece, for example in a wristwatch.

[0002] In a moon phase calendar mechanism, the moon phases are typically displayed using a moon disc depicting one or more moons. This disc allows the moon to be shown, through a suitably shaped aperture, as it appears during its revolution. The moon disc is advanced step by step, one step per day, either directly or indirectly by a 24-hour wheel. In a calendar mechanism that displays the day of the week, the day of the week is indicated by a day-of-the-week indicator. This indicator might be, for example, a hand moving along a circular scale marked with the days of the week, or a disc inscribed with the days to be displayed successively through an aperture.The day of the week indicator, for example, is fixed in rotation to a seven-pointed day star which is driven step by step at a rate of one step per day by a twenty-four-hour wheel.

[0003] In a date mechanism that includes a moon phase display and a day-of-the-week display, both displays are driven either by separate 24-hour wheels or by a single 24-hour wheel. A disadvantage of driving each display with a separate 24-hour wheel is that it necessitates duplicating the drive mechanisms, resulting in a relatively large size for the date mechanism. When both displays are driven by the same 24-hour wheel, they are generally driven sequentially by the same finger attached to the 24-hour wheel. This finger might, for example, first drive the day star, and then, for instance, a moon star or wheel that directly or indirectly drives the moon disc.Single-finger training generally limits the possibilities for relative positioning of displays and / or requires the addition of often bulky and cumbersome links.

[0004] Document CH 708 507 A2 describes a display mechanism in which a 24-hour wheel includes a tooth that drives a moon wheel one step per revolution, and a finger that drives the day star, also one step per revolution. While such a solution allows both displays to be driven simultaneously by a single 24-hour wheel, it requires the finger and tooth to be positioned at different heights to avoid driving the other display, which implies that the mechanism is relatively thick.

[0005] One aim of the present invention is to provide a mechanism for displaying the phases of the moon and the day of the week, the size of which is optimized and which allows simultaneous training of the two displays.

[0006] Another objective of the present invention is to provide a mechanism for displaying the phases of the moon and the day of the week offering great freedom in the relative positioning of the displays.

[0007] These goals and other advantages are achieved by a mechanism for displaying the phases of the moon and the day of the week intended to be driven step by step by a clockwork movement of a timepiece, the mechanism for displaying the phases of the moon and the day of the week comprising a moon phase display mechanism, a day of the week display mechanism and a one-way clutch moving part kinematically linking the moon phase display mechanism and the day of the week display mechanism so that when, in normal operation, one of the moon phase display mechanisms or the day of the week display mechanism is advanced by one step in a direction of travel it drives the other of the day of the week display mechanism or the moon phase display mechanism by means of the one-way clutch moving it forward by one step,and that when at least one of the moon phase display mechanisms or the day of the week display mechanisms is advanced in at least one direction, it does not cause the other of the day of the week display mechanisms or the moon phase display mechanisms to advance.

[0008] Driving one display mechanism by the other allows, under normal operating conditions, both display mechanisms to be driven by a single drive unit, for example, by a single rotating finger on a 24-hour wheel. Using a unidirectional clutch unit allows either display mechanism to be driven in a direction in which the other display mechanism is not driven, thus enabling independent adjustment of at least one of the display mechanisms.

[0009] Preferably, the moon phase and day-of-the-week display includes a seven-pointed star intended to be driven step by step by a clockwork mechanism and to drive, step by step, either the moon phase display mechanism or the day-of-the-week display mechanism. In normal operation, the seven-pointed star completes one full rotation in seven days, which corresponds to the duration of one cycle of the day-of-the-week display.

[0010] The unidirectional clutch mobile comprises, for example, a first body mounted to rotate freely and a second body mounted to rotate freely coaxially with the first body, the unidirectional clutch mobile being configured so that the first body and the second body are rotationally fixed when the first body or the second body is driven in a clutching direction of the unidirectional clutch mobile and are rotationally unfixed when the first body or the second body is driven in a disengagement direction of the unidirectional clutch mobile.

[0011] The first body is, for example, a gear wheel comprising internal teeth, and the second body is a pawl collaborating with the internal teeth of the gear wheel.

[0012] According to some embodiments of the invention, one of the moon phase display mechanism or the day of the week display mechanism is kinematically linked directly to the first body and the other of the moon phase display mechanism or the day of the week display mechanism is kinematically linked directly to the second body.

[0013] The moon phase display mechanism includes, for example, a moon disc for displaying the moon phases, the moon disc meshing with the first moving part.

[0014] The second mobile, for example, is fixed in rotation to a mobile displaying the day of the week.

[0015] Preferably, the mechanism for displaying the moon phases and the day of the week includes at least one setting mechanism configured to drive one of the moon phase display mechanisms or the day of the week display mechanisms without driving the other of the moon phase display mechanisms or the day of the week display mechanisms.

[0016] The goals mentioned above and other advantages are also achieved by a moon phase calendar comprising such a mechanism for displaying the phases of the moon and the day of the week and a twenty-four-hour wheel to advance the mechanism for displaying the phases of the moon and the day of the week in the direction of travel in normal operation.

[0017] The calendar includes, for example, a rocker activated by a finger fixed in rotation to the twenty-four-hour wheel to advance one of the moon phase display mechanism or the day of the week display by one step per day.

[0018] The goals mentioned above and other advantages are also achieved by a timepiece including such a moon phase calendar.

[0019] The invention will be better understood upon reading the description below, illustrated by the figures where: There figure 1 is a top view of a mechanism for displaying the phases of the moon and the day of the week according to one embodiment of the invention; The figure 2 is seen in transparency of the mechanism of the figure 1 ; There figure 3 is a bottom view of the mechanism of the figure 1 . There figure 4is a top view of a mechanism for displaying the phases of the moon and the day of the week according to another embodiment of the invention; The figure 5 is seen in transparency of the mechanism of the figure 4 ; There figure 6 is a bottom view of the mechanism of the figure 4 .

[0020] With reference to the figures, the moon phase and day of the week 1 display mechanism according to the invention comprises a moon phase display mechanism 2 and a day of the week display mechanism 3.

[0021] The moon phase display mechanism 2 includes a moon phase indicator for displaying the phases of the moon on an unrepresented dial of a timepiece, for example, on the dial of a wristwatch. The moon phase indicator is, for example, a moon disc 20 mounted to rotate and having at least one moon 21 on its upper face, allowing the moon to be displayed, through a suitably shaped aperture in the dial, as it appears during its revolution.

[0022] The day of week 3 display mechanism includes an indicator of the day of the week not shown, for example a rotating driven plate on which are inscribed the days of the week to be displayed successively through a window in the dial or a needle moving along a scale on the dial.

[0023] The moon phase display mechanism 2 and the day of the week display mechanism 3 are configured to be driven step by step, so that their respective indicators also advance step by step. In normal operation, the moon phase display mechanism 2 and the day of the week display mechanism advance one step per day.

[0024] According to the invention, the moon phase and day of the week display mechanism comprises a unidirectional clutch 4. The unidirectional clutch 4 comprises two bodies 40, 41, preferably mounted to rotate freely and kinematically linked to each other such that when one of the bodies 40, 41 is driven in a direction of engagement of the unidirectional clutch 4, it drives the other body 41, 40 in rotation, and when one of the bodies 40, 41 is driven in a direction of disengagement of the unidirectional clutch 4, it does not drive the other body 41, 40 in rotation. The two bodies 40, 41 of the unidirectional clutch 4 are, for example, coaxial, the two bodies 40, 41 being fixed in rotation in the engagement direction and unfixed in rotation in the disengagement direction.

[0025] According to the invention, the one-way clutch 4 kinematically connects the moon phase display mechanism 2 and the day-of-the-week display mechanism 3 such that, in normal operation, one of the moon phase display mechanisms 2 or the day-of-the-week display mechanism 3 drives the other of the day-of-the-week display mechanism 3 or the moon phase display mechanism 2 via the one-way clutch 4, which is then driven in its direction of engagement. One body 40 of the one-way clutch 4 meshes, for example, with a moving part of the moon phase display mechanism 2, for example, with the moon disc 20, and the other body 41 of the one-way clutch 4 is, for example, rotationally fixed or meshed with a moving part of the day-of-the-week display mechanism 3.

[0026] The moon phase and day of the week 1 display mechanism of the invention is thus configured to be driven in normal operation by a single drive unit, for example by a single finger 90 fixed in rotation to a twenty-four-hour wheel 9. In normal operation, the drive unit, for example the finger 90, drives in the direction of travel either the moon phase display mechanism 2 or the day of the week display mechanism 3, which in turn drives in the direction of travel the other of the day of the week display mechanism 3 or the moon phase display mechanism 2 by means of the unidirectional clutch unit 4.The unidirectional clutch mobile 4 also allows the moon phase display mechanism 2 and the day of the week display mechanism 3 to be separated when at least one of the two mechanisms 2, 3 is advanced in a direction corresponding to the disengagement direction of the unidirectional clutch mechanism 4.

[0027] According to the illustrated embodiments, the drive unit driving the moon phase and day-of-the-week display mechanism 1 of the invention is a finger 90 that completes one full rotation every twenty-four hours. The finger 90 is, for example, rotationally fixed to a twenty-four-hour wheel 9 of a clockwork movement (not shown). With each rotation, the finger 90 acts on the moon phase display mechanism 2 or on the day-of-the-week display mechanism 3 to advance it by one increment. The finger 90 acts, for example, on a moon star 5 of the moon phase display mechanism 2 or on a day star 6 of the day-of-the-week display mechanism 3, for example, via a drive lever 8.The action via the drive lever 8 allows the finger 90 to remotely act on the corresponding mechanism 2, 3, thus offsetting the display mechanism 2, 3 relative to the twenty-four-hour wheel 9 and offering greater flexibility in the arrangement of displays on a watch dial. The display mechanism 2, 3, advanced by one step by the finger 90, drives, via the unidirectional clutch 4, the other display mechanism 3, 2, which is also advanced by one step.

[0028] According to the form of execution illustrated by the figures 1 to 3 , finger 90, visible on the figures 2 And 3 , activates at each turn of the twenty-four-hour wheel 9 a drive lever 8 configured to advance one step at each activation a moon star 5, visible on the figures 2 And 3The Moon Star 5, for example, is a seven-pointed star. A Moon Jumper 50 cooperates in a known way with the points of the Moon Star 5 to index and maintain the position of the Moon Star 5 at the end of each step. The drive rocker 8 includes a beak 80 which, each time the drive rocker 8 is actuation by the finger 90, comes into contact with a branch of the moon star 5 and pushes it forward to advance the moon star 5 by one step, against the elastic force holding the moon jumper 50. A moon wheel 25 is rotationally fixed to the moon star 5 and meshes with the moon disk 20 to advance it by one step for each step of the moon star 5. The moon wheel 25 meshes, for example, with a peripheral toothing 22 of the moon disk 20. After advancing the moon star 5 by one step, the drive rocker 8 returns to its rest position and the beak 80 is moved away from the moon star 5.In normal operation, the moon star 5 advances one step every twenty-four hours, thereby advancing the moon wheel 25 and the moon disc 20 by one step every twenty-four hours. Other mechanisms are conceivable within the scope of the invention for driving the moon wheel 25 and / or the moon star 5 by one step per day. Other configurations of the moon phase indicator are also possible within the scope of the invention, for example, a moon disc featuring two or three moons.

[0029] According to the form of execution illustrated by the figures 1 to 3 , the moon phase display mechanism 2 drives the day of the week display mechanism 3 in normal operation via the one-way clutch mobile 4, so that when the moon phase display mechanism 2 is advanced one step by finger 90, the day of the week display mechanism 3 is also advanced one step.

[0030] According to the form of execution illustrated by the figures 1 to 3 The unidirectional clutch assembly 4 comprises a toothed wheel 40 and a pawl 41 mounted to rotate coaxially with each other. The toothed wheel 40 meshes with the teeth 22 of the lunar disc 20, and the pawl 41, visible on the figure 1 , is fixed in rotation to a wheel of the 36 days of the display of the day of the week 3, partially visible on the figure 3The gear 40 comprises internal teeth, and the pawl 41 cooperates with the internal teeth of the gear 40 to rotationally lock the gear 36 and the gear 40 when the gear 40 or the gear 36 is rotated in a direction corresponding to the engagement direction of the one-way clutch assembly 4, and to rotationally unlock the gear 36 and the gear 40 when the gear 40 or the gear 36 is rotated in the direction corresponding to the disengagement direction. The operation and construction of such a one-way clutch assembly 4 are described, for example, in international application WO 2021 / 094889 A1 filed by the applicant, the contents of which are incorporated herein by reference.Other types of unidirectional clutch mobiles are however conceivable within the framework of the invention for the normal operating drive of the day of the week display mechanism 3 by the moon phase display mechanism 2.

[0031] According to the form of execution illustrated by the figures 1 to 3By way of illustration, but in no way limiting, the day display mechanism 3 is a retrograde mechanism. The day display mechanism 3 comprises the day wheel 36 which meshes with a toothed sector 33 on the axis of which the day-of-the-week indicator (not shown) is preferably fixed. The day-of-the-week indicator is, for example, a hand designed to move along a scale on a clock face on which the days of the week are inscribed, or a sector of a disc on which the days of the week are inscribed to be displayed successively through an aperture on a clock face.

[0032] Sector 33 and the 36-day wheel are configured to form a retrograde mechanism. Every seven steps of the 36-day wheel, sector 33 disengages from the wheel and returns, via a rapid return movement, to a starting position where the indicator shows the first day of the week, for example, Monday. In this position, sector 33 is ready to re-engage with the 36-day wheel at the next step. At the next step, sector 33 advances one step so that the indicator shows the second day of the week, for example, Tuesday. This continues until the last day of the week, for example, Sunday.

[0033] A day pinion 34, fixed in rotation to the sector 33, engages with a return rake 35, allowing the mechanism to be tensioned by the force of a spring 37. During the step of the day wheel 36 corresponding to the transition from the last day of the week to the first day of the following week, the sector 33 returns almost instantaneously in the opposite direction to its starting position under the effect of the elastic force of the spring 37, thus bringing the indicator back to the position corresponding to the display of the first day of the week.

[0034] Other types of day-of-the-week display mechanisms are however conceivable within the framework of the invention, for example jumping mechanisms indicating the day of the week on a circular scale and / or using a disc bearing the days of the week and making a complete turn per week, the day-of-the-week indicator then being, for example, directly rotationally attached to the ratchet 41 or rotationally attached to a wheel meshing with the day wheel 36.

[0035] According to the form of execution illustrated by the figures 1 to 3 The day display mechanism for week 3 preferably includes a seven-pointed star for 6 days, visible on the figure 3The 6-day star rotates in tandem with the 36-day wheel. In normal operation, the 6-day star advances one step per day, completing a full rotation in seven steps. A 60-day jumper interacts with the arms of the 6-day star in a known manner to index and maintain the star's position at the end of each step. The position of the 6-day star determines the position of the 36-day wheel, and consequently, the position of the day-of-the-week indicator. Therefore, the position of the 6-day star at the end of each of the seven steps results in the day-of-the-week indicator displaying a different day of the week.Preferably, the gear ratio between the moon disk 20 and the gear wheel 40 is the inverse of the gear ratio between the moon wheel 25 and the moon disk 20, so that when the moon star 5 is rotated by a step corresponding to one-seventh of a turn, the day star 6 also rotates by a step corresponding to one-seventh of a turn.

[0036] According to another method of execution illustrated by the figures 4 to 6 , finger 90, visible on the Figures 5 And 6 , activates with each rotation of the twenty-four-hour wheel 9 a drive lever 8 configured to advance one step with each activation of the day of the week display mechanism 3. With each activation by finger 90, the drive lever 8 advances one step of the day star 6 of the day of the week display mechanism, visible on the Figures 5 And 6According to the embodiment illustrated by way of example, the drive rocker 8 comprises two articulated parts, enabling the drive rocker 8 to activate the day star 6 located at a distance from finger 90 with a relatively small movement. The day star 6 is preferably a seven-pointed star. The drive rocker 8 includes a beak 80 which, each time the drive rocker 8 is actuation by finger 90, contacts one point of the day star 6 and pushes it forward to advance the day star 6 by one step. In normal operation, the day star 6, and consequently the day-of-week-3 display mechanism, advances one step per day.

[0037] According to the form of execution illustrated by the figures 4 to 6By way of illustration, but in no way limiting, the day display mechanism for 3 days is a retrograde mechanism. The day display mechanism for 3 days comprises a snail 38 and a day rake 39. The snail 38 is rotationally fixed to the day star 6 and preferably comprises seven steps, each step corresponding to a day of the week. The day rake 39 comprises a feeler 390 designed to be kept in contact with the steps of the snail 38 in order to read the information concerning the day of the week to be displayed from the snail. The day rake 39 meshes with a day pinion 34, on the shaft of which, for example, the day-of-the-week indicator (not shown) is fixed. The position of the day rake 39, which is determined by the snail 38, thus determines the position of the day-of-the-week indicator.The day of the week indicator is, for example, a hand intended to travel along a scale on a clock face on which the days of the week are inscribed, or a sector of a disc on which the days of the week are inscribed to be displayed successively through a window on a clock face.

[0038] As is known, the snail 38 and the day rake 39 form a retrograde mechanism. Every seven steps of the snail 38, the feeler 390 moves from the highest to the lowest rung of the snail 38, so that the day rake 39 returns, by a rapid return movement, to a starting position in which the day-of-the-week indicator shows the first day of the week, for example, Monday. In the next step, the feeler moves from the lowest rung of the snail 38 to the second rung, so that the day-of-the-week indicator shows or displays the second day of the week, for example, Tuesday. And so on until the last day of the week, for example, Sunday. Preferably, a return rake 35 meshes with the pinion of the days 34 in order to tension the mechanism and thus keep the feeler 390 in contact with the snail 38 under the effect of the elastic return force of a spring 37 acting on the return rake 35.During the step of the day wheel 36 corresponding to the transition from the last day of the week to the first day of the following week, the day rake 39 returns almost instantaneously in the opposite direction to its starting position under the effect of the elastic force of the spring 37, thus bringing the day of the week indicator back into the position corresponding to the display of the first day of the week.

[0039] Other types of mechanisms for displaying the day of the week are, however, conceivable, for example a retrograde display mechanism such as the one described in relation to the execution mode illustrated by the figures 1 to 3 , or a jumping mechanism indicating the day of the week for example on a circular scale and / or using a disc bearing the days of the week and making a complete rotation per week, the indicator of the day of the week then being for example coaxial and fixed in rotation with the star of the days 6.

[0040] The moon phase display mechanism 2 includes a moon disc 20 on which at least one moon 21 is depicted to display, through a suitably shaped aperture, the moon as it appears during its revolution. The moon disc 20 preferably includes teeth 22, for example peripheral teeth, to allow it to rotate about its axis.

[0041] According to the invention, the moon phase display mechanism 2 is driven by the day of the week display mechanism 3 via a one-way clutch 4. According to the embodiment illustrated by the figures 4 to 6The unidirectional clutch mobile 4 comprises a toothed wheel 40, and a pawl 41 mounted movably in rotation coaxially with the toothed wheel 40. The pawl 41 cooperates with an internal tooth of the toothed wheel 40 to form a notched clutch: when the force required to drive the pawl 41 or the toothed wheel 40 in rotation by the other of the toothed wheel 40 or the pawl 41 is less than the force required to move the pawl 41 from one notch to the next notch, that is to say, to move the pawl 41 from one groove of the internal tooth of the toothed wheel 40 to the next groove, the toothed wheel 40 and the pawl 41 are rotationally locked together. When the force required for rotational drive is greater than the force required to move from one notch to the next, the pawl 41 moves from one notch to the next and the toothed wheel 40 and the pawl 41 are separated in rotation.The notched clutch formed by the toothed wheel 40 and the pawl 41 is configured so that the force required to move the pawl 41 from one notch to the next is greater than the force required to drive the moon phase display mechanism 2 by the day of the week display mechanism 3 during normal operation. The pawl 41 is rotationally fixed with the day star 6 and the toothed wheel 40 meshes with the moon disc 20. Thus, during normal operation, when the day star 6 is advanced one step in the direction of travel of the mechanism 1 of the invention, the moon disc 20 is also advanced one step.

[0042] According to the form of execution illustrated by the figures 4 to 6The unidirectional clutch mechanism 4 also includes a jumper for the days 46 cooperating with the arms of the star wheel 6 to index and maintain the position of the star wheel 6 at the end of each step. The jumper for the days 46 is further configured to prevent the star wheel 6 from rotating in the opposite direction to the direction of travel, acting like a ratchet. Thus, when the moon disc 20 is rotated in the opposite direction to the direction of travel, the rotation of the star wheel 6 is blocked by the jumper for the days 46, and the ratchet 41 is disengaged from the toothed wheel 40. The unidirectional clutch mechanism 4 is therefore configured to lock the ratchet 41 and the toothed wheel 40 in rotation in one direction of engagement, and to disengage them in rotation in a direction of disengagement. Other embodiments of the unidirectional clutch mechanism are, however, conceivable within the scope of the invention.For example, it is conceivable to brake in the disengagement direction a mobile other than the day star 6, which would also be rotationally fixed to the pawl 41 or the toothed wheel 40, or even to prevent its rotation, in order to cause the disengagement of the notched clutch formed by the pawl 41 and the toothed wheel 40. It is also conceivable to use a unidirectional clutch mobile 4 as described with reference to the embodiment illustrated by the. figures 1 to 3 .

[0043] According to the form of execution illustrated by the figures 4 to 6, the day of the week 3 display mechanism drives the moon phase 2 display mechanism in the direction of travel via the unidirectional clutch mobile 4 which is then actuated in the clutch direction, so that in normal operation when the day of the week 3 display mechanism is advanced by one step by finger 90, the moon phase 2 display mechanism is also advanced by one step.

[0044] An advantage of using a unidirectional clutch mobile 4 according to the invention to kinematically link the day of the week display mechanism 3 and the moon phase display mechanism 2 is that it allows the step-by-step drive of the two display mechanisms 2, 3 using a single drive mobile while allowing independent adjustment of the two displays, the drive in normal operation being in the clutch direction of the unidirectional clutch mobile 4 and the independent adjustment of one of the two display mechanisms 2, 3 being done using at least one adjustment mobile in the disengagement direction of the unidirectional clutch mobile 4.

[0045] According to the embodiment illustrated by the figures 1 to 3The moon phase and day-of-the-week display mechanism 1 comprises two correctors 72 and 73 in the form of two rocker arms acting respectively on the moon star 5 and the day star 6. The correctors 72 and 73 are, for example, each actuated by a push button (not shown) accessible from outside the watch case. The moon phase corrector 72 acts, for example, on the drive rocker arm 8, which in turn acts on the moon star 5, so that each time the moon phase corrector 72 is activated, the drive rocker arm 8 is activated and the moon star 5 is advanced one step in the direction corresponding to the direction of travel of the mechanism 1 of the invention during normal operation.When the moon phase display mechanism 2 is advanced one step in the direction of travel, it also advances the day-of-the-week display mechanism 3 by one step via the unidirectional clutch 4, which operates in the clutch direction. The moon phase corrector 72 thus allows the simultaneous adjustment of both displays. The day-of-the-week corrector 73 acts directly on the day star 6, advancing it one step in the direction of travel with each activation. The rotation of the day star 6 in the direction of travel induces the rotation of the pawl 41 in the disengagement direction of the unidirectional clutch, so that the unidirectional clutch 4 does not then drive the moon phase display mechanism 2. The day-of-the-week corrector 73 thus allows only the day-of-the-week display to be adjusted.

[0046] According to the embodiment illustrated by the figures 4 to 6The adjustment of the moon phase and day-of-the-week display mechanism 1 is achieved using an adjustment wheel 7 that meshes with the moon disc 20, preferably with the peripheral teeth 22 of the moon disc 20. The adjustment wheel 7 is, for example, operated by means of a winding stem (not shown) of the timepiece. When the adjustment wheel 7 is turned in a first direction of adjustment, it drives the moon disc 20 in the direction corresponding to the normal operating direction of the mechanism 1 of the invention. In this direction, since the rotation of the day star 6 is not blocked by the day jumper 46, the day display mechanism 3 is driven step by step by the rotation of the moon disc, via the unidirectional clutch 4. When the adjustment wheel is turned in a second direction of adjustment opposite to the first, the moon disc 20 rotates in the opposite direction to the normal operating direction.With the rotation of the day star 6 blocked in the opposite direction to the direction of travel by the day jumper 46, the unidirectional clutch 4 disengages and the day-of-the-week display 3 is not advanced by the adjusting wheel 7. The moon phase display mechanism 2 can thus be adjusted independently of the day-of-the-week display mechanism 3. In a preferred embodiment, the internal teeth of the gear 40 have twice as many teeth as the number of steps required to complete a full rotation in normal operation. In the illustrated embodiment, the internal teeth of the gear 40 have fourteen teeth, so that the pawl 41 and the gear 40 can assume fourteen stable relative positions. This allows for fine adjustment of the moon phase display 2 relative to the day-of-the-week display in half-step increments.According to one variant, the internal teeth of the toothed wheel 40 are replaced by a cylindrical wall and the pawl 41 is pressed against this cylindrical wall, thus forming a friction arm without notches between the first and second body of the unidirectional clutch mobile, which would allow even more precise adjustment of the moon phase display mechanism relative to the day of the week display mechanism.

Claims

1. Mechanism for displaying the phases of the moon and the day of the week (1) intended to be driven step by step by a clockwork movement of a timepiece, the mechanism for displaying the phases of the moon and the day of the week (1) comprising a moon phase display mechanism (2), a day of the week display mechanism (3) and a one-way clutch mobile (4) kinematically linking the moon phase display mechanism (2) and the day of the week display mechanism (3) such that when, in normal operation, one of the moon phase display mechanisms (2) or the day of the week display mechanism (3) is advanced by one step in a direction of travel it drives the other of the day of the week display mechanism (3) or the moon phase display mechanism (2) via the one-way clutch mobile (4) to advance it by one step,and that when at least one of the moon phase display mechanism (2) or the day of the week display mechanism (3) is advanced by one step in at least one direction, it does not cause the other of the day of the week display mechanism (3) or the moon phase display mechanism (2) to advance.

2. Mechanism for displaying the phases of the moon and the day of the week (1) according to the preceding claim, comprising a seven-pointed star intended to be driven step by step by a clockwork movement of a timepiece and to drive step by step one of the moon phase display mechanism (2) or the day of the week display mechanism (3).

3. Mechanism for displaying the phases of the moon and the day of the week (1) according to any one of the preceding claims, the one-way clutch mobile (4) comprising a first body (40) mounted movably in rotation and a second body (41) mounted movably in rotation coaxially with the first body (40), the one-way clutch mobile (4) being configured such that the first body (40) and the second body (41) are rotationally joined when the first body (40) or the second body (41) is driven in a clutching direction of the one-way clutch mobile (4) and are rotationally separated when the first body (40) or the second body (41) is driven in a disengagement direction of the one-way clutch mobile (4).

4. Mechanism for displaying the phases of the moon and the day of the week (1) according to the preceding claim, the first body being a toothed wheel (40) comprising an internal toothing and the second body being a ratchet (41) collaborating with the internal toothing of the toothed wheel (40).

5. Mechanism for displaying the phases of the moon and the day of the week (1) according to any one of claims 3 and 4, one of the moon phase display mechanism (2) or of the day of the week display mechanism (3) being kinematically linked directly to the first body (40) and the other of the moon phase display mechanism (2) or of the day of the week display mechanism (3) being kinematically linked directly to the second body (41).

6. Mechanism for displaying the phases of the moon and the day of the week (1) according to the preceding claim, the moon phase display mechanism (2) comprising a moon disc (20) for displaying the phases of the moon, the moon disc (20) meshing with the first moving part (40).

7. Mechanism for displaying the phases of the moon and the day of the week (1) according to one of claims 5 and 6, the second moving part (41) being rotationally fixed to a moving part of the display of the day of the week (3).

8. Mechanism for displaying the phases of the moon and the day of the week (1) according to any one of the preceding claims, comprising at least one adjusting mobile (73, 7) configured to drive one of the moon phase display mechanism (2) or the day of the week display mechanism (3) without driving the other of the moon phase display mechanism (2) or the day of the week display mechanism (3).

9. Moon phase calendar comprising a mechanism (1) according to any one of the preceding claims and a twenty-four hour wheel (9) for advancing the mechanism (1) in the direction of travel in normal operation.

10. Moon phase calendar according to the preceding claim, comprising a rocker (8) activated by a finger (90) fixed in rotation to the twenty-four hour wheel to advance one of the moon phase display mechanism (2) or the day of the week display (3) by one step per day.

11. Timepiece comprising a date display according to one of claims 9 and 10.

Images