The invention relates to a device including: a movable element (1) comprising teeth (11; 11i, i, 11i+1, 11i+2, 11i+3, 11i+4); a driving element (2) for engaging with the teeth (11; 11i, 11i+1, 11i+2, 11i+3, 11i+4) of the movable element (1) so as to set the movable element (1) in motion in a direction of movement; an actuator element (3) capable of generating an alternating movement so as to move the driving element (2) according to at least two phases, i.e. a driving phase, during which the driving element (2) is engaged with a tooth (11; 11i, 11i+1, 11i+2, 11i+3, 11i+4) of the movable element (1), and a return phase without driving, during which the driving element (2) is shifted with respect to the movable element (1); and a first indexing element (4), which includes a first indexing finger (41) to be positioned between two teeth (11; 11i, 11i+1, 11i+2, 11i+3, 11i+4) of the movable element (1), and which is connected to the actuator element (3) in order to move the driving element (2) and the first indexing finger (41) simultaneously.