<p>The device has a locking finger (8) that entirely locks rotation of a toothed wheel (7) when the finger is engaged in one of set of teeth of the toothed wheel. Another finger is arranged between a set of stop members (10, 11). A space between the stop members limits an angular travel of the toothed wheel when the latter finger is engaged in one of teeth of the toothed wheel. The locking finger is controlled by an electrostatic or hydraulic actuator. The locking finger is formed in a notched shape. An independent claim is also included for a method for locking and unitary incrementation of a drive module.</p>
