A transmission couples the main drive of an electrostatographic development system to a toner dispensing roll and a spring-loaded striker of a toner dispenser for the development system. The transmission typically includes a Geneva wheel for periodically actuating a lever arm which is coupled by a one-way clutch to a drive shaft for the toner dispenser. That drive shaft suitably is, in turn, mated with a slot at the outer end of the dispensing roll by an enlarged flat or key which functions to alternately cock and release the striker as the dispensing roll is being rotated.