A timepiece including at least analogue time display device, and an AM-PM display device for displaying day-night information in the dial of the timepiece. The AM-PM display device includes at least two apertures made in the dial of the watch, a rotating display disc bearing at least one first series of inscriptions corresponding to the day and at least one second series of inscriptions corresponding to the night, these two display series being disposed on at least two concentric circles, and a drive mechanism arranged so as to automatically and alternately bring the first series of inscriptions inside a first aperture and the second series of inscriptions inside a second aperture by rotating the display disc.

A timepiece including at least analogue time display device, and an AM-PM display device for displaying day-night information in the dial of the timepiece. The AM-PM display device includes at least two apertures made in the dial of the watch, a rotating display disc bearing at least one first series of inscriptions corresponding to the day and at least one second series of inscriptions corresponding to the night, these two display series being disposed on at least two concentric circles, and a drive mechanism arranged so as to automatically and alternately bring the first series of inscriptions inside a first aperture and the second series of inscriptions inside a second aperture by rotating the display disc.

A device for controlling at least two electronic and/or mechanical functions of a portable object of small dimensions includes a control stem that is axially movable between at least a first and a second position. The control stem is provided at a first end with an actuation member, and is provided towards a second end with a position indexing plate arranged to cooperate with an elastic member in order to match each of the first and second positions of the control stem with one of the mechanical or electronic functions.

A device for controlling at least two electronic and/or mechanical functions of a portable object of small dimensions includes a control stem that is axially movable between at least a first and a second position. The control stem is provided at a first end with an actuation member, and is provided towards a second end with a position indexing plate arranged to cooperate with an elastic member in order to match each of the first and second positions of the control stem with one of the mechanical or electronic functions.

A timepiece movement includes a movement case, a drive mechanism, a time mechanism driven by the drive mechanism, a day mechanism, and a day adjustment mechanism. The day mechanism is driven by the time mechanism through a frictional engagement therebetween. Once a torque generated by the day adjustment mechanism overcomes the frictional engagement, the day mechanism is permitted to be driven by the day adjustment mechanism. Therefore, an indicated day of the timepiece movement can be adjusted without pulling out of a day adjustment knob or an actuating shaft of the day adjustment mechanism.

A timepiece movement includes a movement case, a drive mechanism, a time mechanism driven by the drive mechanism, a day mechanism, and a day adjustment mechanism. The day mechanism is driven by the time mechanism through a frictional engagement therebetween. Once a torque generated by the day adjustment mechanism overcomes the frictional engagement, the day mechanism is permitted to be driven by the day adjustment mechanism. Therefore, an indicated day of the timepiece movement can be adjusted without pulling out of a day adjustment knob or an actuating shaft of the day adjustment mechanism.

The invention relates to a correction device for a timepiece, comprising a differential gear having a first inlet, a second inlet and an outlet, wherein: the first inlet is arranged to be driven by a timepiece movement; the second inlet is kinematically linked with a corrector gear extending from a control member and comprising a clutch for establishing and interrupting the kinematic link between said control member and said second inlet; the outlet is arranged to drive a display device of said timepiece movement, the angular position of said outlet being defined on the basis of the angular position of said first inlet as well as on that of said second inlet, wherein said correction device further comprises a memory cam desmodromically linked with said second inlet, in that said memory cam experiences a return force provided by a resilient member tending to maintain said memory cam in at least one predetermined angular position when said kinematic link between said control member and said second inlet is interrupted, said resilient member also being arranged to allow a rotation of said second inlet under the control of said control member when said kinematic link is established during the use of the correction device, and in that said correction device is arranged so that the incidence of the rotation of the second inlet during a correction on the angular position of the outlet is removed when said memory cam is located in said at least one predetermined angular position.

The invention relates to a correction device for a timepiece, comprising a differential gear having a first inlet, a second inlet and an outlet, wherein: the first inlet is arranged to be driven by a timepiece movement; the second inlet is kinematically linked with a corrector gear extending from a control member and comprising a clutch for establishing and interrupting the kinematic link between said control member and said second inlet; the outlet is arranged to drive a display device of said timepiece movement, the angular position of said outlet being defined on the basis of the angular position of said first inlet as well as on that of said second inlet, wherein said correction device further comprises a memory cam desmodromically linked with said second inlet, in that said memory cam experiences a return force provided by a resilient member tending to maintain said memory cam in at least one predetermined angular position when said kinematic link between said control member and said second inlet is interrupted, said resilient member also being arranged to allow a rotation of said second inlet under the control of said control member when said kinematic link is established during the use of the correction device, and in that said correction device is arranged so that the incidence of the rotation of the second inlet during a correction on the angular position of the outlet is removed when said memory cam is located in said at least one predetermined angular position.

A drive device for a display element for displaying a quantity associated with time or derived from time, includes a cam that is pivoted about a first axis and designed to drive the movement of the display element, the cam having a peak, a lever that is pivoted about a second axis, and a spring that is designed to return the lever into contact with the cam, wherein an angle () is formed, in a plane perpendicular to the first and second axes, between (i) a straight line passing through (a) the contact point between the peak, in particular the point is farthest from the first axis, and the lever, and (b) the first axis, and (ii) a straight line passing through the first axis (A3) and the second axis, the angle () is less than or equal to 70.

Timepiece calendar device (100) including a first display disk (1) for displaying dates having a first face (11) bearing date indications (10) and mobile about an axis (A), and a second display disk (2) for displaying days having a second face (21) bearing day indications (20) and mobile about the axis (A), the first and second disks being such that the first and second faces are coplanar, the second face being disposed around the first face.