an integral revolution clutch is provided wherein a motor rotates a drive pulley which continuously drives an idler pulley through a belt . a drive shaft is provided with a segment of a circle thereon connectable to the idler pulley by means of the belt . a spring means urges the segment into contact with the belt and a stop means normally prevents contact . when the stop means is deactivated , the segment is drawn between the belt and the pulley , causing the shaft on which the segment is located to make an integral number of revolutions until the stop means is restored . in a similar manner , power can be taken directly from the drive pulley .