Disclosed is a timepiece mechanism which has a mobile including a tooth of a first type and a tooth of a second type, and a pawl that is intended to move the mobile by at least one step on each actuation and has a travel that is liable to move the mobile by two steps on each actuation. This timepiece mechanism has a correction mobile designed to define different paths of the pawl, depending on the state thereof, the pawl and the correction mobile being designed such that, on each actuation of the pawl: the pawl moves the mobile by one step; and the pawl moves the mobile by an additional step only when the correction mobile is in a predefined state and the tooth of the second type is situated along the travel of the pawl.

System (1) for a watch calendar, the system comprising a first wheel (3); a first finger (5b) for driving the first wheel; a tooth (31b) for driving the first wheel, the tooth being movably mounted on the first wheel (3) between a retracted position and a driving position; and a desmodromic system (2, 4) comprising a cam (2) and a cam follower (4), the desmodromic system being arranged in such a way that at least a first position of the cam defines a first position of the follower permitting the retraction of the tooth, and that at least a second position of the cam defines a second position of the follower preventing the retraction of the tooth.

A timepiece calendar system (100) including: a date mobile (1); a first device (3) for indexing the position of the date mobile; a second device (4) for indexing the position of the date mobile; an element (70, 3b, 4b, 40) for activating and deactivating at least one of the first and second indexing devices, the indexing of the date mobile by one or the other of the first and second indexing devices being mutually exclusive.

A correction mechanism for a timepiece date display mechanism, arranged to change the angular position of a display wheel set comprised in such a date display mechanism, this correction mechanism includes, on the one hand, a control wheel set arranged to be controlled by user action and/or by a timepiece mechanism, and on the other hand, an output wheel set arranged to cooperate with such a display wheel set; this correction mechanism includes a free wheel mechanism which is arranged to disengage the output wheel set from the control wheel set in a first relative direction of rotation, and to engage the output wheel set with the control wheel set in a second relative direction of rotation opposite to the first relative direction of rotation.

A date display device with an annual calendar function comprises the following elements: a drive wheel (8) which is coupled to a mechanical movement, a driving device which is driven by the drive wheel (8), a date wheel (4) which periodically interacts with the driving device and is driven by this and a month wheel (5) which is periodically interacts with the date wheel, as well as a month cam disc (6) which is connected to the month wheel. The driving device comprises a driver (8.1) and a rotation axis (8.3), wherein the driver moves on a path about the rotation axis (8.3) of the driving device and the rotation axis adopts at least two different positions relative to the date wheel (4), wherein in a first position, the driving device advances the date wheel by a single unit and in a second position by a plurality of units and wherein the adopted position depends on the number of days of the month concerned.

A calendar mechanism including date-discs, a date program unit, a drive unit that drives the date program unit and a drive member for actuating the drive unit. The date-discs include a first lower units disc and a second upper units disc, and a third lower tens disc and a fourth upper tens disc. The date program unit includes date program wheel sets for actuating the date-discs and arranged to mesh selectively with the date-discs so that the last day of the month is displayed with the third lower tens disc and the first upper units disc, and the first day of the following month is displayed with the fourth upper tens disc and the second upper units disc, the change of date between two consecutive months occurring via a single jump of the fourth upper tens disc and of the second upper units disc, regardless of the month. The mechanism may include a month wheel set and a leap-year adjustment mechanism arranged to cooperate with the drive unit, the drive unit being a month program wheel.

A calendar mechanism (1) for a timepiece, said calendar mechanism (1) being suitable for indicating a piece of information having a period that varies according to at least a first cycle and a second cycle, said mechanism (1) comprising, inter alia, a system (13) for actuating said lever (9), the actuating system (13) comprising a first feeler-spindle (21a) intended to come into contact with the first cam (15) and a second feeler-spindle (23a) intended to come into contact with the second cam (17), said feeler-spindles (21a, 23a) being kinematically linked with each other and the actuating system (13) being arranged to move said lever (9) from the inactive position of same to the active position of same under the control of each of said cams (15, 17).

The present invention relates to a timepiece comprising an at least annual date mechanism (1) which comprises a month-management cam (2), a large lever (4) arranged to cooperate with said month-management cam, a date-indicating mechanism, a month-indicating mechanism, and at least one mechanism for independent correction of the date or month comprising at least one date-correcting or month-correcting member, respectively, arranged to cooperate with said date-indicating or month-indicating mechanism, respectively. The date-correcting or month-correcting mechanism, respectively, comprises a date-correcting cam (50) or a month-correcting cam (22), respectively, mounted so as to be freely rotatable, a date-correcting or month-correcting stem, respectively, which can be rotated in order to rotate the date-correcting cam (50) or the month-correcting cam (22), respectively, said date-correcting cam (50) or month-correcting cam (22), respectively, being arranged so as to, during rotation thereof, drive the large lever (4) in order to isolate said large lever (4) at least from the month-management cam (2) before the date or month is corrected, respectively, and to drive the actuation of the date-correcting or month-correcting member, respectively, in order to subsequently correct the date or month, respectively, the rotation of the date-correcting or month-correcting cam, respectively, being controlled solely by rotation of the date-correcting or month-correcting stem, respectively.

A horology calendar system (100; 200) comprising: a date display member (10) including an opening (10a); and a month display member (30) arranged in such a way as to display an indication of the month in the opening (10a), notably when the opening (10a) is visible to a user of the calendar system and/or when the calendar system is indicating the first day of a given month.

A calendar mechanism including date-discs, a date programme unit, a drive unit that drives the date programme unit and a drive member for actuating the drive unit. The date-discs include a first lower units disc and a second upper units disc, and a third lower tens disc and a fourth upper tens disc. The date programme unit includes date programme wheel sets for actuating the date-discs and arranged to mesh selectively with the date-discs so that the last day of the month is displayed with the third lower tens disc and the first upper units disc, and the first day of the following month is displayed with the fourth upper tens disc and the second upper units disc, the change of date between two consecutive months occurring via a single jump of the fourth upper tens disc and of the second upper units disc, regardless of the month. The mechanism may include a month wheel set and a leap-year adjustment mechanism arranged to cooperate with the drive unit, the drive unit being a month programme wheel.