Patent ID: 9188960
Filing Date: 2015-11-17
Classification: G04C

Abstract:
1. A mechanism for driving one or more hands and/or at least one date disc of an electromechanical watch, the mechanism comprising, mounted on a plate or a frame of the mechanism: an electric motor, a set of gear wheels connected to the electric motor to move the hand or hands and/or the date disc forward or backward on each actuation of the electric motor, and a locking device for locking at least one wheel of the set of gear wheels, said locking device comprising a stud fixed to the plate or the frame of the mechanism of the electromechanical watch, wherein the locking device includes a piezoelectric actuator or an electro-active polymer element or a shape memory element arranged for locking via a bolt at least one of the wheels of the set of gear wheels between each actuation of the electric motor, while allowing the set of gear wheels connected to said electric motor to move the hands and/or the date disc forward or backward on each actuation of the electric motor, and wherein the bolt is guided in a through aperture of the stud of the locking device fixed to the plate or the frame of the mechanism of the electromechanical watch.