Regulating system for a horology movement comprising a device for stopping an oscillator

A regulating system for a horology movement comprising:

• a mechanical oscillator, oscillating around an axis of oscillation, comprising a balance coupled to a spring, each oscillation of said mechanical oscillator consisting of two successive vibrations characterised by the rotation of the balance in two successive and opposite directions of rotation;
• a stop device on the mechanical oscillator configured to lock the balance in a predetermined angular position for each of the two vibrations of the mechanical oscillator, in which the spring has non-zero potential energy;
• wherein the stop device comprises a retaining organ, secured to the balance, configured to engage with a stop click mounted so as to rotate freely at one end of a stop lever, said stop lever being mobile between an inactive position allowing free oscillation of the mechanical oscillator and an activated position in which the stop click is on the path of the retaining organ,
• said stop click being configured so that, when the stop lever is in the activated position, the stop click allows the retaining organ to move in the direction of rotation of the current vibration of the balance, when the stop device is activated, and to lock the rotation in the reverse direction of rotation of the balance in the next vibration, said stop click forming a stop to the movement of the retaining organ.