Abstract: Apparatus for driving a roller-shutter door comprises a driving plate, a planetary-gearset, a stationary housing, and adjustable control means. The adjustable control means is mounted in the stationary housing for cooperating with the driving plate as well as the planetary-gearset for controlling the actuation of a motor whereby a roller-shutter door can be moved to a predetermined limit position. More especially, the adjustable control means is disposed to extend from the stationary housing such that the adjustable control means can be manually adjusted from outside of the stationary housing.