The invention is directed to a power driven hair clipper (HSM), comprising a drive mechanism provided in a housing (1) and a clipper head (S) equipped with a clipper comb (3) and a clipper blade (4, 82) and mounted on said housing (1) for pivotal motion about a pivot axis (Z), wherein the clipper comb (3) is in cooperating relationship with two clipper blades (4, 82), each being adapted to be coupled with a drive member (12) of the drive mechanism according to the pivot position of the clipper head (S) relative to the housing (1).