Abstract: The invention relates to a drive mechanism (30) especially for a window wiping device (1) with an elliptical wiping motion, said device comprising a primary actuating axle (20), a rotary support (40), a fixed toothed wheel (50), at least one central toothed wheel (60), an output toothed wheel (70), and a secondary actuating axle (50), the toothed wheels (50, 60, 70) being engaged with each other and forming a two-stage gear system. The invention is characterised in that the rotary support (40) comprises two supporting elements (41, 42) that respectively carry the two stages of the gear system, and in that the two supporting elements (41, 42) can be arranged in relation to each other following at least two separate angular positions in which the toothed wheels (50, 60, 70) are effectively engaged.