Passive indexing of a movable element having teeth

A device comprising:

• a mobile element (1) comprising teeth (11;
• 11i;
• 11i+1, 11i+2, 11i+3, 11i+4) and intended to be set in motion;
• a drive element (2) intended to engage with the teeth (11;
• 11i, 11i+1, 11i+2, 11i+3, 11i+4) of the mobile element (1) to set in motion the mobile element (1) in a direction of displacement;
• an actuator element (3) connected to the drive element (2) capable of generating alternative motion to shift the drive element (2) in at least two phases, a driving phase and a return phase,
• during the driving phase, the drive element (2) is engaged with at least one tooth (11;
• 11i, 11i+1, 11i+2, 11i+3, 11i+4) of the mobile element (1) to push or pull the mobile element (1), during the return phase without driving, the drive element (2) is offset relative to the mobile element (1) to be engaged with at least one other tooth (11;
• 11i, 11i+1, 11i+2, 11i+3, 11i+4) of the mobile element (1),
• a first indexing element (4) comprising a first indexing finger (41) intended to be positioned intermittently in a space between two teeth (11;
• 11i, 11i+2, 11i+3, 11i+4) of the mobile element (1) to prevent uncontrolled displacement by the drive element in the direction of displacement of the mobile element (1) or in the opposite direction;
• and
• characterised in that the first indexing element (4) is connected to the actuator element (3) such that the actuator element (3) simultaneously shifts the drive element (2) and the first indexing finger (41).