Abstract: A horological module (1) for a horological movement, for example an automaton or a ringing mechanism. The horological module (1) includes a plate (2) and a mechanical device (10) able to pass from an idle state, wherein the mechanical device (10) is immobile with respect to the plate (2), to an operating state, wherein at least a part of the mechanical device (10) is able to move with respect to the plate (2) when it is actuated. A barrel (3) provides energy to the mechanical device (10) and a gear train (20) is actuated by the barrel (3). A regulator regulates the speed of the mechanical device (10) and there is provided an element (30) for automatically locking the mechanical device (10), configured to lock the regulator to put the mechanical device (10) in the idle state.