The invention relates to a drive device for intermittent driving of a conveyor(1) that partly surrounds a drum (3) rotatable around a centre axis (0). Thedrive device comprises drive member (5, 6) and motion transmission member (3,7, 8, 9). According to the invention, the drive member is (5, 6) arranged toexecute a reciprocating motion. The motion transmission member (3, 7, 8, 9),in the motion of the drive member (5, 6) in a first direction, is arranged toimpart the drum (3) a rotary motion in a first rotary direction and impart theconveyor a motion. Further, the motion transmission member (3, 7, 8, 9), inthe motion of the drive member (5, 6) in a second direction, is arranged toimpart the drum (3) a rotary motion in a second rotary direction in such a waythat the conveyor (1) is at rest. The invention also relates to acorresponding method.
