Abstract: Date system for a horological movement comprising a tens disc (2) connected to a star wheel (4) driven by a first drive device (12), and a units disc (1) driven by a second drive device (13). The said drive devices (12, 13) are connected to a rocker (9) which works with cams (10, 11) connected to a driving runner (5), which effects one rotation per month. These cams (10, 11) are provided with a tooth (20) and a notch (21) which keep the first drive device (12) in the disengaged position until the tooth (20) and the notch (21) actuate the said rocker (9) in order to engage and disengage the respective drive devices (12, 13) in such a way as to move the display from the 31st to the 1st of the month without an error of one day between the date indicated and the actual date.

Abstract: Date system for a horological movement comprising a tens disc (2) connected to a star wheel (4) driven by a first drive device (12), and a units disc (1) driven by a second drive device (13). The said drive devices (12, 13) are connected to a rocker (9) which works with cams (10, 11) connected to a driving runner (5), which effects one rotation per month. These cams (10, 11) are provided with a tooth (20) and a notch (21) which keep the first drive device (12) in the disengaged position until the tooth (20) and the notch (21) actuate the said rocker (9) in order to engage and disengage the respective drive devices (12, 13) in such a way as to move the display from the 31st to the 1st of the month without an error of one day between the date indicated and the actual date.

Abstract: An electrical switch suitable for a miniature apparatus such as a wristwatch comprises a resilient contact plate which is mounted on a member capable of rotating about an axis. The contact plate has two arms which extend radially from a rigid or mounted central portion. The outer ends of the arms are supported on a contact member, the arms being elastically deformed by the action of the contact forces. The two arms have different lengths and they are weakened in a different manner by apertures at their mounting location. Consequently, it is possible to achieve ideal compensation for the couples produced by the contact forces. In addition, an ideal deformation of the arms of the contact plate is obtained, as well as a well-defined position for the bearing points of the contacts.

Abstract: The correction device of the invention makes it possible to activate, in the same axial position of the crown, two different modes of correction of the data displayed by the watch, it being possible to make those corrections in both directions, depending on the direction of rotation of the crown.The second correction mode is activated only after a reversal of direction of the correction made according to the first mode.This device contains, notably, memory means 11, 12, associated with each direction of rotation of the crown, and selection means 21, 31, 22, 32, for choosing the mode and the direction of correction activated in accordance with the direction of rotation of the crown, on the one hand, and a possible reversal of that direction, on the other.