Patent ID: 6975053
Filing Date: 2005-12-13
Classification: H02K

Abstract:
1. A rotator driving device that drives first and second rotators, comprising: a motor that supplies a rotational drive force to the first rotator; and a drive branching unit that branches the rotational drive force, the branched rotational drive force being used for driving the second rotator, wherein the drive branching unit has a main rotating member and a slave rotating member fixed inside a drive pulley which is configured to drive the second rotator via a belt, the main and slave rotating members rotating in a common direction, the main rotating member is set coaxial with the first rotator and rotates as the first rotator rotates, the main rotating member has an outer surface with a first plurality of alternating north and south poles set in the direction of rotation of the first rotator, the slave rotating member has a second plurality of alternating north and south poles set in the direction of rotation of the driving pulley along an inner surface of the drive pulley, all of the first plurality of alternating north and south poles of the main rotating member are set facing with all of the second plurality of alternating north and south poles of the slave rotating member, and the slave rotating member rotates together with the main rotating member owing to a magnetic action exerted between the first and second plurality of alternating north and south poles.