The seed grains are held against gravitation in recesses on the seed drum by a guide plate (64) whereby the seed outlet channel is provided at the end of the guide plate. This channel (65) can be arranged both inside and outside the seed drum. The seed outlet channel can be formed inside the drum as partially inclined collecting rail into which the seed grains drop. A torque transfer device has wheels of different diameter attachable jointly or separately on drum axle.
