Horological module actuatable at isolated moments, comprising automatic locking means

A horological module (1) for a horological movement, comprising:

• 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 the mechanical device (10) is actuated;
• a barrel (3) for providing energy to the mechanical device (10), the mechanical device (10) including a geartrain (20) actuatable by the barrel (3);
• and
• automatic locking means (30) for automatically locking the mechanical device (10), the automatic locking means (30) comprising a rotary cam (4) and a movable body (7) cooperating with the rotary cam (4), the movable body (7) being able to move between a locking position, wherein the mechanical device (10) is in the idle state, and a retracted position, wherein the mechanical device (10) is in the operating state, wherein the rotary cam (4) is mounted to the barrel (3) such that an axis of rotation of the rotary cam (4) coincides with an axis of rotation of the barrel (3) and a rotation of the rotary cam (4) is integral with a rotation of the barrel (3).