Timepiece with universal hours comprising a date correction mechanism

Abstract

The present invention relates to a universal timepiece (10) comprising a city disc (12), a twenty-four-hour disc (14), an hour indicator, a disc support (18) rotatably secured to the city disc (12), a driving member (16) rotatably secured to the twenty-four-hour disc (14) and arranged to be rotated at a rate of one revolution in twenty-four hours, a time zone correction mechanism intended to actuate the rotation of the city disc (12), the twenty-four-hour disc (14) and the hour indicator at each time zone correction, and a date display. The date display comprises an indication support (45) comprising date indications, a date indicator (48), and a date correction mechanism comprising a trigger system (60).This is arranged to induce each day a first movement of the date indicator (48) relative to the indication support (45) in one direction. The date correction mechanism further comprises an actuating element (20) integral with the disc support (18) to induce a second movement of the date indicator (48) relative to the indication support (45) in an opposite direction when a time zone correction causes the date to move back.

Description

Technical field

[0001] The present invention relates to a world time timepiece comprising a date correction mechanism. The correction mechanism makes it possible to correct the date according to the selected time zone. State of the art

[0002] World time timepieces can simultaneously indicate the local time where the user is located and in other time zones. By convention, the Earth is divided into twenty-four time zones. The first time zone is centered on the Greenwich Meridian and is generally referred to by the abbreviation UTC or UTC 0. Local time in London, called Greenwich Mean Time (GMT),is used as a reference for calculating time around the world. Time is one hour ahead or one hour behind when moving from one time zone to another depending on whether you are moving east or west. For example, for the time in Switzerland, its difference from London is 1 hour, so Switzerland is at GMT+1. The twenty-four time zones therefore extend along the circumference of the Earth between UTC + 12 and UTC -11 (in winter time).

[0003] This type of timepiece comprises a disc on which are indicated within twenty-four 15° sectors the names of twenty-four cities, each corresponding to a different time zone. For example, London is inscribed within a 15° sector of the disc and Geneva GMT+1 is inscribed within an adjacent sector. In general, this disc has a sector diametrically opposite the Greenwich sector and in which the city of Auckland is indicated (UTC +12). A sector adjacent to that of the city of Auckland indicates Midway (UTC -11). The meridian separating these two time zones implies a change of date. When crossing this meridian from Midway to Auckland, the date must be advanced by one day, while when crossing in the opposite direction, the date must be set back by one day.

[0004] There is, however, a special case between 11 p.m. and midnight for the time zone corresponding to Auckland where the date must remain unchanged when moving to the time zone corresponding to Midway. Indeed, moving to midnight causes the date to move forward by one day, while moving from Auckland to Midway causes the date to move back by one day.

[0005] Generally speaking, a universal timepiece does not have a date display or the date display is only linked to local time since the correction of the date in order to address the above-mentioned problem is complex to achieve, in particular the simultaneous and contradictory action on a date star in the above-mentioned particular case.

[0006] EP2790069, however, offers a timepiece with twenty-four time zones and equipped with a date display mechanism capable of modifying the date according to all possible time zone changes. This mechanism allows, in particular, to subtract a day from the date when a time zone change occurs between Auckland and Midway before 11 p.m., and to leave the date unchanged when a time zone change occurs between Auckland and Midway between 11 p.m. and midnight Auckland time.

[0007] For this purpose, the date display mechanism according to EP2790069 comprises a synchronization mechanism kinematically connected to the date mechanism and to a time zone mechanism. This synchronization mechanism comprises a differential gear configured in particular so that an output wheel of the differential, depending on the combination of the inputs, can perform one of the following operations: setting the date back by one day, advancing the date by one day, the date remaining unchanged. In particular, the simultaneous rotation of an input star by one step and of a satellite wheel by one step leaves an output wheel, carrying the date hand in this case, immobile for a change of time zone between Auckland and Midway occurring between 11 p.m. and midnight Auckland time.

[0008] The differential gear chain mentioned above, however, has the disadvantage of causing play, requiring the addition of an additional jumper, designed to be activated at the same time as the main jumper. However, the use of these jumpers significantly increases the consumption of the timepiece. Brief summary of the invention

[0009] An aim of the present invention is therefore to propose a universal timepiece equipped with a date mechanism whose consumption is significantly lower than the aforementioned mechanism.

[0010] This aim is achieved in particular by means of a universal timepiece comprising a city disc, a twenty-four-hour disc, an hour indicator, a disc support integral in rotation with the city disc, a driving member integral in rotation with the twenty-four-hour disc and arranged to be driven in rotation at the rate of one revolution in twenty-four hours, a time zone correction mechanism intended to actuate in rotation the city disc, the twenty-four-hour disc and the hour indicator at each time zone correction, and a date display. The date display comprises an indication support comprising date indications, a date indicator, and a date correction mechanism comprising a trigger system. This is arranged to induce each day a first movement of the date indicator relative to the indication support in one direction.The date correction mechanism further comprises an actuating element secured to the disc support to induce a second movement of the date indicator relative to the indication support in an opposite direction when a time zone correction causes the date to move back.

[0011] In one embodiment, the date indicator or the indication support is kinematically connected to a date star. The trigger system is configured to actuate the date star in rotation in a first direction in order to induce said first movement. The actuating element of the disc support is arranged to indirectly actuate the date star in rotation in a second direction opposite to the first direction in order to induce said second movement.

[0012] In one embodiment, the indication support is in the form of a date disc. The date indicator or the date disc is rotatably secured to a date crown meshing with a date wheel secured to the date star.

[0013] In one embodiment, the date correction mechanism further comprises a correction wheel engaged with the date wheel and a correction star rotatably secured to the correction wheel. The actuating element is arranged to be able to engage a tooth of the correction star to induce said second movement.

[0014] In one embodiment, the trigger system comprises a twenty-four-hour wheel arranged to complete one revolution in twenty-four hours, a cam secured to the twenty-four-hour wheel, a lever arranged to cooperate with the cam to perform one jump per day and a finger to drive the date star in the first direction with each jump of the lever. The finger is movably mounted on the lever to be disengaged from the date star when the date star is rotated in the second direction by the actuating element.

[0015] In one embodiment, the trigger system further comprises a drive member pivotally mounted on the rocker and comprising the finger.

[0016] In one embodiment, the drive member comprises a follower arranged to move in a groove along a closed path. The groove comprises a first portion acting on the follower to pivot the drive member on the lever so that the finger can engage a tooth of the date star with each jump of the lever.

[0017] In one embodiment, the groove includes a second portion acting on the follower to pivot the drive member on the lever so that the finger is clear of the date star from the end of the lever's jump until the next jump.

[0018] In one embodiment, the time zone correction mechanism comprises a first lever arranged to actuate in rotation the driving member of the twenty-four-hour disc and the hour indicator, and a second lever arranged to actuate in rotation the support of the city disc. The two levers are arranged to cooperate with a control member moving in a first direction and then in a second opposite direction in order to return to its initial position so that one of the levers can actuate one of said support and said driving member when the control member is actuated in the first direction and in that the other of the levers can actuate the other of said support and said driving member when the control member moves in the second direction.

[0019] In one embodiment, the two rockers are connected to each other by a connecting member.

[0020] In one embodiment, the city disc support is in the form of a first ring arranged to be actuated in rotation by one of the two rockers. The driving member is in the form of a second ring arranged to be actuated in rotation by the other of the two rockers.

[0021] In one embodiment, the second crown is engaged with a driving wheel arranged to be actuated in rotation by said other of the two rockers.

[0022] In one embodiment, the second crown is furthermore kinematically connected to a wheel of a drive train. This wheel is integral with a five-toothed star cooperating with a jumper so that the rotational actuation of the driving wheel drives the twenty-four-hour crown by one twenty-fourth of a turn and the hour indicator by one twelfth of a turn. Brief description of the figures

[0023] Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which: there Figure 1 illustrates a top view of part of the movement of the timepiece with a partial representation of the date disc, the city discs and the twenty-four-hour disc; Figures 2a to 2c illustrate top views of an operational sequence of the time zone correction mechanism during a one-way stroke of the control member; Figures 3a to 3c illustrate top views of an operational sequence of the time zone correction mechanism during the opposite direction of travel of the control member, and Figures 4a to 4f illustrate an operational sequence of the date trigger mechanism at the passage of midnight. Detailed description of the embodiments of the invention

[0024] The timepiece according to the invention illustrated by the figures may in particular be a wristwatch or a table clock comprising a mechanism for displaying universal times and time zones known to those skilled in the art and described for example in CH693191. The timepiece also comprises a mechanism for displaying and correcting the date which will be described later and which allows the date to be triggered when a change of time zone causes a change of date at the passage of midnight.

[0025] In reference to the Figure 1, the universal timepiece 10 conventionally comprises a first disc 12 called the city disc 12 on which the name of twenty-four cities is inscribed. Each city corresponds to one of the twenty-four time zones. For simplification, only GMT indications of the type GMT-4, GMT-5, GMT-4 have been shown corresponding to different time zones specific to different cities. A second disc 14, called the twenty-four-hour disc 14, is arranged inside the city disc and has a numbering from 1 to 24 (only the numbers 7 and 8 are shown) so that the incrementation of the numbers is carried out in a clockwise direction to allow the time to be read opposite each city.

[0026] The twenty-four-hour disc 14 is kinematically connected to the hour wheel carrying the hour hand of the time display mechanism of the timepiece so as to rotate continuously in the counterclockwise direction at the rate of one revolution in twenty-four hours. For this purpose, the twenty-four-hour disc 14 is secured to a driving member 16 arranged to be rotated by the movement at the rate of one revolution in twenty-four hours.

[0027] The time displayed by the hour and minute hands of a conventional world time timepiece corresponds to the current time of the city on the city disc 12 located at 12 o'clock relative to the dial of the timepiece. This time is referred to in this application as "local time". To read the time in another time zone, it is sufficient to find the inscription of the city corresponding to this other time zone and read the number on the twenty-four-hour disc 14 located opposite this city.

[0028] The timepiece 10 further comprises a date display mechanism. This notably comprises an annular disc 45 and a date indicator in the form, for example, of an aperture 48. The disc 45 is arranged around the city disc 12 and comprises the numbering from 1 to 31 of the days of the month. According to the illustrated embodiment, the date disc 45 is fixed while the aperture 48 is integral with a crown 46 meshing with a date wheel 50, the latter being integral with a date star 52. It will be understood that the date disc may be integral with the crown while the aperture may be fixed, for example in the form of an opening in the dial, according to a more conventional date display.

[0029] According to another embodiment, the date star could comprise 31 teeth and carry a date hand. In this case, the dial could include the numbering from 1 to 31 of the days of the month arranged for example along an annular zone on the dial concentric with the rotation axis of the date hand. The presence of a date disc is therefore not an essential characteristic of the date display mechanism.

[0030] Generally speaking, the mechanism for displaying universal times and time zones allows the user to change the time zone and display the time corresponding to this new time zone by a time zone correction mechanism. This mechanism includes a control member (not shown), for example a pusher that can be manually operated by the user a number of times necessary to bring the city of the new time zone and indicated on the city disc 12 to 12 o'clock relative to the dial of the timepiece. This new time zone typically corresponds to the local time where the user is located.

[0031] Conventionally, the time zone correction mechanism is intended to rotate the 12 city disc and the 14 twenty-four hour disc counterclockwise for each time zone correction. The hour hand is typically kinematically connected to the 14 twenty-four hour disc so as to be driven to make a one-hour jump clockwise for each time zone correction.

[0032] For this purpose, the city disc 12 is secured to a disc support 18. This is in the form of a first crown 18 comprising a series of twenty-four teeth 19 distributed regularly over its external circumference. The twenty-four hour disc 14 is secured to a second crown 16 arranged inside the first crown 18 coaxially therewith. The second crown 16 comprises external teeth engaged with a wheel 22 of a motor train via two return wheels 26, 28.

[0033] According to the lower part of the Figure 1, the time zone correction mechanism comprises a first lever 34 arranged to actuate in counterclockwise rotation the crown 16 integral in rotation with the twenty-four hour disc 14, and a second lever 40 arranged to actuate in counterclockwise rotation the crown 18 integral with the city disc 12. More particularly, the first lever 34 is mounted to pivot around the axis A and comprises a part 38 actuable by the user by the control member such as a pusher via a lever (not illustrated).

[0034] This first lever further comprises an arm 36 whose end is configured to cooperate with a wolf-toothed wheel 32, under the effect of a spring (not shown). The latter is mounted coaxially and integrally with a driving wheel 30 engaged with the crown 16. The second lever 40 is mounted to pivot about the axis B and comprises a finger 42 arranged to engage between two teeth 19 of the first crown 18 and to push against one of these teeth in order to actuate the rotation of the city disc 12 in the counterclockwise direction. The two levers 34, 40 are connected to each other by a connecting member 44.

[0035] It will be understood, according to the description of the operational sequence of the time zone correction mechanism which will be made later with reference to the Figures 2a to 2c , And 3a to 3c, that this mechanism allows the twenty-four hour disc 14 and the city disc 12 to be actuated in a counterclockwise direction sequentially. The actuation of the twenty-four hour disc 14 and the city disc 12 occurs in fact respectively during the "back and forth" movement of the control member, for example a push button, when it is actuated.

[0036] It will also be noted that wheel 22 of the driving train is integral with a five-toothed star 24 cooperating with a jumper 77. The gear ratio between wheel 22, the two intermediate wheels 26, 28 and the teeth of crown 16 has also been determined so that the rotational actuation of driving wheel 30 by first lever 34 can drive twenty-four-hour crown 16 by one twenty-fourth of a turn. In other words, star 24 ensures an indexed position of twenty-four-hour disc 14 at each time zone change. It will also be understood that second lever 40 allows crown 18 to be rotated at any time by one twenty-fourth of a turn in the counterclockwise direction to bring the city corresponding to the new time zone and inscribed on city disc 12 at 12 o'clock relative to the dial of the timepiece.

[0037] In order for the date mechanism to be able to display the date specific to the selected time zone at all times while overcoming the disadvantages of the prior art, the timepiece 10 comprises a date correction mechanism comprising, on the one hand, a trigger system 60 kinematically linked to the crown 16 supporting the twenty-four-hour disc 14 and arranged to change the date every day at midnight, and on the other hand, an actuating element 20 secured to the crown 18 supporting the city disc 12.

[0038] This actuating element may be in the form, for example, of a finger 20 whose end is beyond the end of the teeth 19 of the crown 18. According to the example illustrated, this finger 20 is intended to engage a correction star 58 secured to a correction wheel 56 meshing with the date wheel 50 each time the correction of the time zone causes a change from Auckland to Midway, causing the date to be set back by one day.

[0039] The trigger system 60 is configured to actuate the date star 52 and the date wheel 50 of the date display mechanism in rotation in the clockwise direction in order to increment the date by one unit during the "go" of the control member while the date star 52 is actuated in a counterclockwise direction by the action of the finger 20 on the correction star 58 of the correction wheel 56 during the "come" of the control member when a time zone correction results in a date change. The sequential actuation of the date star 52 by one step in the clockwise and counterclockwise directions during the back-and-forth movement of the control member makes it possible in particular to leave the date unchanged during a time zone change between Auckland and Midway occurring between 11 p.m. and midnight Auckland time.

[0040] In reference to the Figure 4a, the trigger system 60 comprises for this purpose a twenty-four hour wheel 62 arranged to make one revolution in twenty-four hours and kinematically connected to the crown secured to the twenty-four hour disc, a snail-shaped cam 64 secured to the twenty-four hour wheel 62, a lever 66 arranged to cooperate with the cam 64 via a feeler 68 and a lever spring (not shown) acting on the lever 66. The latter is thus configured to make one jump per day. A drive member 70 is pivotally mounted on the lever and comprises a finger 72 to drive the date star 52 in the clockwise direction with each jump of the lever.

[0041] Since time zone correction can occur at any time, it is essential that the trigger system 60 activates star 52 at midnight clockwise instantly while remaining clear the rest of the time to allow for a correction of the reverse date when a change of time zone causes the date to go back.

[0042] For this purpose, the drive member 70 is configured to be released from the date star 52 when the date wheel 50 is rotated counterclockwise, by means of the correction wheel 56 driven by the action of the finger 20 on the star 58, as illustrated by the Figure 1, when a time zone correction causes the date to be set back. The drive member 70 comprises a follower 74 arranged to move in a groove 76 along a closed path. The groove comprises a first portion 76a, acting on the follower 74 to pivot the drive member 70 on the lever 66 so that the finger 72 can engage a tooth of the date star 52 at each jump of the lever. The groove 76 comprises a second portion 76b acting on the follower 74 of the pawl 70 to pivot the latter on the lever so that the finger 72 is disengaged from the date star 50 at all times when the lever 66 cooperates with the cam 64 after the jump of the lever until its next jump.

[0043] In order to avoid a malfunction of the date correction in the event that the change of time zone resulting in a change of date occurs when the trigger system 60 actuates the star 52, the first and second levers 32, 40 of the time zone correction mechanism are arranged to actuate in rotation in turn the crown 16 connected to the twenty-four hour disc 14 and the crown 18 connected to the city disc 14.

[0044] More specifically, according to the operational sequence illustrated by the Figures 2a to 2c , And 3a to 3c, when changing time zones, the first lever 34 of the time zone correction mechanism will first actuate the crown 16 in rotation in the counterclockwise direction, thus driving the twenty-four hour disc 14 via the wolf tooth wheel 32 and the driving wheel 30, then the second lever 40 of the correction mechanism will actuate the crown 18 in rotation in the counterclockwise direction, thus driving the city disc 12.

[0045] At each time zone correction, the actuation of the twenty-four hour discs 14 and the city discs 12 is therefore done sequentially. For example, the control member of the time zone correction mechanism may be in the form of a pusher. When the user presses the pusher, it will move the first lever 34 during its travel in a first direction so as to actuate the twenty-four hour disc 14 by one twenty-fourth of a turn in the counterclockwise direction. The pusher will then actuate the city disc 12 by one twenty-fourth of a turn in the counterclockwise direction when the pusher moves in the opposite direction to return to its rest position under the action of return means (not shown).

[0046] More particularly, with reference to the Figure 2a, the part 38 of the first rocker 34 is actuated downwards by the user by means of the control member, which causes the rocker 34 to pivot around its axis A in order to engage the distal part of the arm 36 in the teeth of the wolf-toothed wheel 32. At this moment, the finger 42 of the second rocker 40 rests on a tooth 19 of the crown 18 supporting the city disc 12. When the control member continues its travel according to the Figures 2b and 2c , the arm 36 of the rocker 34 rotates the wolf-toothed wheel 32 in order to drive the crown 16 via the driving wheel 30.

[0047] As explained previously, crown 16 also being engaged with wheel 22 secured to five-tooth star 24, crown 16 is indexed in increments of 15° or one twenty-fourth of a turn by each action on the control member. This allows a shift per full hour, regardless of the position of the hour hand (depending on the minute displayed).

[0048] The two levers 36, 40 being connected to each other by the connecting member 44, the movement of the first lever 34 makes it possible to release the finger 42 of the second lever 40 from one of the teeth 19 of the crown 18 supporting the city disc 12 and to position this finger 42 so that it can engage an adjacent tooth 19 of the crown 18 supporting the city disc 12.

[0049] Referring to the Figures 3a to 3c, once it reaches the end of its travel, the control member moves in the opposite direction to reach its rest position. The control member being connected to the actuable part 38 of the first lever 34, the latter pivots around the axis A in the counterclockwise direction in order, on the one hand, to disengage the arm 36 of this lever from the wolf-toothed wheel 32 and, on the other hand, to pivot the second lever 40 around its axis B in the clockwise direction by means of the connecting member 44 to engage the finger 42 against a tooth 19. During the movement of the control member into its rest position, the finger 42 pushes against the tooth 19 in order to actuate the rotation of the crown 18 by one twenty-fourth of a turn in the counterclockwise direction and the city disc 12 in the same way to bring the city corresponding to the new time zone to 12 o'clock relative to the dial of the timepiece.

[0050] Thus, when the control member of the time zone correction mechanism is actuated by the user between 11 p.m. and midnight to indicate the time zone corresponding to Midway, during the first movement of the lever 34, the trigger system 60 will actuate the date wheel 50 clockwise by its action on the date star 52, then, during the second movement of the lever 34, the finger 20 of the crown 18 actuates the date wheel 50 counterclockwise by its action on the correction star 58. The date thus remains unchanged when moving to the time zone corresponding to Midway. Indeed, the passage to midnight causes the date to be advanced by one day while the passage from Auckland to Midway causes the date to be set back by one day.

[0051] The figures Figures 4a to 4f illustrate an operational sequence of the date correction mechanism.

[0052] According to the Figure 4a, the finger 72 of the pawl 70 is disengaged from the star 52 of the date wheel. The user can make a change of time zone resulting in a change of date since the star can be driven at this instant in the counterclockwise direction. It will be noted that the state of the trigger system 60 corresponds to a local time close to midnight since the feeler 68 of the lever 66 is located at the top of the cam 64. At this instant, the follower 74 of the pawl 70 is located upstream of the first rectilinear segment 76a of the groove 76.

[0053] When the state of the trigger system 60 corresponds to midnight, local time, under the action of the rocker spring, the rocker 66 drops from the top of the cam until the feeler 68 comes into contact with the beginning of a transition portion of the cam as illustrated by the Figures 4b and 4c. This movement sequence is carried out instantaneously, that is to say in a few milliseconds. During this sequence, the follower 74 moves along the first portion 76a of the groove, which makes it possible to orient the drive member 70 so that the finger 72 can engage a tooth of the date star 52.

[0054] This star comprising seven teeth and cooperating with the jumper 54, each instantaneous jump of the lever 66 drives the date star 52 and the date wheel 50 into rotation by one seventh of a turn. The gear ratio between the date wheel 50 and the date crown 46 has been determined so that the date indicator 45 is driven by one thirty-first of a turn with each jump of the date star 52.

[0055] Once the jump is made, cam 64 will gradually arm trigger system 60 over twenty-four hours. As illustrated by the figures 4e, 4f And 4a, the follower 74 moves, during this period of time, along a portion 76b of the groove making it possible to orient the drive member 70 so that the finger 72 is always clear of the date star 52 in order to allow at any time a correction of the time zone resulting in a date setback, or even a setting correction

[0056] Various modifications may be made to the timepiece without departing from the scope of the invention defined by the appended claims. For example, according to an alternative embodiment, the system for triggering the date correction mechanism may comprise a pawl having two predefined positions, i.e. an engaged position to be able to actuate the date star and a position disengaged from this star. This pawl may be controlled by engagement and disengagement stops, in addition to a jumper spring or a bistable blade, keeping the pawl in the engaged position when the lever falls and in the disengaged position when the lever rises.

[0057] According to another non-illustrated embodiment, the triggering system of the date correction mechanism may comprise a finger arranged to be armed for 24 hours, then released instantly to move directly to a rest position located outside the toothing of the date star. An example of this type of mechanism is disclosed in CH707439B1. Reference list

[0058] Timepiece 10 City disc 12 Twenty-four-hour disc 14 Driving member 16 (e.g. crown) Disc support 18 Teeth 19 Actuating element 20 Driving train 22 Star 24 First intermediate wheel 26 Second intermediate wheel 28 Driving wheel 30 Wolf-tooth wheel 32 First lever 34 Pivot shaft A Arm 36 Actuable part 38 Second lever 40 Pivot shaft B Finger 42 Connecting member 44 Date display mechanism Indication support 45 Date crown 46 Date indicator (e.g. Window 48) Date wheel 50 Date star 52 Jumper 54 Correction wheel 56 Correction star 58 Trigger system 60 Twenty-four-hour wheel 62 Cam 64 Lever 66 Feeler 68 Drive member 70 Finger 72 Follower 74 (eg pin) Groove 76 First portion 76a Second portion 76b Jumper 77

Claims

1. Timepiece (10) with universal times comprising a city disc (12), a twenty-four-hour disc (14), an hour indicator, a disc support (18) integral in rotation with the city disc (12), a driving member (16) integral in rotation with the twenty-four-hour disc (14) and arranged to be driven in rotation at the rate of one revolution in twenty-four hours, a time zone correction mechanism intended to actuate in rotation the city disc (12), the twenty-four-hour disc (14) and the hour indicator at each time zone correction, and a date display, the date display comprising an indication support (45) comprising date indications, a date indicator (48),and a date correction mechanism comprising a trigger system (60) arranged to induce each day a first movement of the date indicator (48) relative to the indication support (45) in one direction, the date correction mechanism further comprising an actuating element (20) secured to the disc support (18) to induce a second movement of the date indicator (48) relative to the indication support (45) in an opposite direction when a time zone correction causes the date to move back., 2. Timepiece (10) according to claim 1, wherein the date indicator (48) or the indication support (45) is kinematically connected to a date star (52), the trigger system (60) being configured to actuate the date star (52) in rotation in a first direction in order to induce said first movement, the actuating element (20) of the disc support (18) being arranged to actuate the date star (52) in rotation, indirectly, in a second direction opposite to the first direction in order to induce said second movement.

3. Timepiece (10) according to the preceding claim, in which the indication support is in the form of a date disc (45), the date indicator (48) or the date disc (45) being integral in rotation with a date crown (46) engaged with a date wheel (50) integral with the date star (52).

4. Timepiece according to the preceding claim, in which the date correction mechanism further comprises a correction wheel (56) engaged with the date wheel (50), and a correction star (58) integral in rotation with the correction wheel (56), the actuating element (20) being arranged to be able to engage a tooth of the correction star (58) to induce said second movement.

5. Timepiece (10) according to one of claims 2 to 4, wherein the trigger system (60) comprises a twenty-four-hour wheel (62) arranged to complete one revolution in twenty-four hours, a cam (64) secured to the twenty-four-hour wheel (62), a lever (66) arranged to cooperate with the cam (64) in order to perform one jump per day and a finger (72) for driving the date star (52) in the first direction at each jump of the lever, the finger (72) being movably mounted on the lever to be disengaged from the date star (52) when the date star (50) is actuated in rotation in the second direction by the actuating element (20).

6. Timepiece (10) according to the preceding claim, in which the trigger system (60) further comprises a drive member (70) pivotally mounted on the lever (66) and comprising the finger (72).

7. Timepiece (10) according to the preceding claim, in which the drive member (70) comprises a follower (74) arranged to move in a groove (76) along a closed trajectory, the groove comprising a first portion (76a) acting on the follower (74) to pivot the drive member (70) on the lever (66) so that the finger (62) can engage a tooth of the date star (50) with each jump of the lever.

8. Timepiece (10) according to the preceding claim, in which the groove comprises a second portion (76b) acting on the follower (74) to pivot the drive member (70) on the lever so that the finger (62) is released from the date star (50) from the end of the jump of the lever until the next jump.

9. Timepiece (10) according to one of the preceding claims, wherein the time zone correction mechanism comprises a first lever (34) arranged to actuate in rotation the driving member (16) of the twenty-four-hour disc (14) and the hour indicator, and a second lever (40) arranged to actuate in rotation the support (18) of the city disc (12), the two levers (34, 40) being arranged to cooperate with a control member moving in a first direction then in a second opposite direction in order to return to its initial position so that one of the levers (34, 40) can actuate one of said support (18) and said driving member (16) when the control member is actuated in the first direction and in that the other of the levers (34, 40) can actuate the other of said support (18) and said driving member (16). when the control member moves in the second direction.

10. Timepiece (10) according to the preceding claim, in which the two levers (34, 40) are connected to each other by a connecting member (44).

11. Timepiece (10) according to claim 9 or 10, wherein the city disc support (12) is in the form of a first crown (18) arranged to be actuated in rotation by one of the two levers (34, 40), the driving member (16) being in the form of a second crown (16) arranged to be actuated in rotation by the other of the two levers (34, 40).

12. Timepiece (10) according to the preceding claim, in which the second crown (16) is engaged with a driving wheel (30) arranged to be actuated in rotation by said other of the two levers (34, 40).

13. Timepiece (10) according to the preceding claim, in which the second crown (16) is furthermore kinematically connected to a wheel (22) of a driving train, said wheel (22) being integral with a five-toothed star cooperating with a jumper (77) so that the rotational actuation of the driving wheel (30) drives the twenty-four-hour crown (16) by one twenty-fourth of a turn and the hour indicator by one twelfth of a turn.

Images