The coupling device for a timepiece (400) includes a first part (41;41;41), a second part (42;42;42) mobile relative to the first part about a first axis (A1;A1;A1), at least one blocking element (43;43;43), and a control element (45;45;45) movably mounted on one of the parts to move between a deactivation first configuration (C1) and an activation second configuration (C2), the device being unidirectional or a freewheel in its activation second configuration (C2), the at least one blocking element (43;43;43), the first part (41;41;41), and the second part (42;42;42) being configured and/or adapted so as to connect the first and second parts by obstacle or by wedging, the at least one blocking element (43;43;43) being adapted and/or configured so that, in the first configuration (C1) it enables free relative movement of the first and second parts during rotation in a first direction and in a second direction opposite the first direction, and in the second configuration (C2) it enables coupling of the first and second parts during loading of one or the other in the first direction and free relative movement between the parts during rotation in the second direction.

A repeater including an hours piece mounted to rotate between a rest position and a reading position; a device for regulating the angular speed of the hours piece, which includes a rotor and a system for braking the rotor; and a transmission gear train between the hours piece and the rotor, this gear train including a disengageable primary mobile able to adopt two configurations: a) an engaged configuration in which the primary mobile couples the hours piece to the rotor while the hours piece is moved from its reading position to its rest position; b) a disengaged configuration in which the primary mobile decouples the rotor from the hours piece as soon as the latter is stopped in the rest position.

Drive device (100), notably for a horology calendar system (200), the drive device comprising a drive mobile (10) for driving an element (4) that is to be driven, notably a calendar element, the drive mobile being intended to be mounted so that it can rotate about an axis (A1) and comprising (a) a support (11); (b) a first flank (f11) for driving the element that is to be driven; and (c) a second flank (f12) arranged in such a way as to receive an action to retract the drive mobile, notably extending orthoradially or substantially orthoradially with respect to the axis (A1); the mobile comprising a slide link (111, 121; 11, 120; 110, 120) connecting the second flank to the support.

System (10) including (i) a pawl device (110) for a first wheel (6) of a first part (301) of a drivetrain (300) for winding a mainspring (7); (ii) a clutch device (120) for engaging a second part (302) of a drivetrain (300) for winding the mainsprin (7) with the first part (301) of the drivetrain (300) for winding the mainspring (7); and (iii) a coupling device (130) for coupling the pawl device and the clutch device, particularly a device (130) for coupling the states of operation of the pawl device and of the clutch device.

A system (90) for driving and holding in position a mobile unit (50) for displaying time or time derivative information includes a device (80) for driving a mobile unit (50) including a driving cam (13) and a driving lever (30) provided to drive a driving member (23), a device (40) for holding a mobile unit (50) in position, a device (70) for activating and deactivating the position-holding device (40) including a deactivation cam (22), and a device (12, 21) for mechanically coupling or synchronizing the driving cam (13) and the deactivation cam (22). In one embodiment, the driving cam and the deactivation cam have separate rotation axes and are linked by a gear mechanism. In another embodiment, the driving cam and the deactivation cam are coaxial.

Disclosed is a unidirectional clutch wheel assembly that includes a first wheel, a second wheel coaxial with the first wheel and including an inner toothing, a rigid drive member rotationally fixed with respect to the first wheel and at least one rigid pawl connected to the rigid drive member by an elastic strip. The rigid pawl is locked against the inner toothing by the rigid drive member to rotationally fix the first and second wheels to each other when the first wheel or the second wheel is rotationally driven in a direction corresponding to coupling. The inner toothing has asymmetrical teeth. The rigid pawl is arranged, in its position locked against the inner toothing, to be in point contact, in top plan view, with two consecutive teeth of the inner toothing and with the rigid drive member.