Patent ID: 8306462

Claim:
A rotor rotating apparatus comprising: a first rotor that rotates; a second rotor supported rotatably at the first rotor and so as to revolve around an axis of the first rotor with rotation of the first rotor; a drive unit that generates drive force for rotating the second rotor; a transmission member configured to move along a direction of a rotation axis of the second rotor between a transmission position at which the transmission member transmits the drive force from the drive unit to the second rotor and a non-transmission position at which the transmission member idles: and a guide member that moves the transmission member to the transmission position when the first rotor is in a first rotation position, and moves the transmission member to the non-transmission position by rotation of the first rotor from the first rotation position, wherein the guide member moves the transmission member to the transmission position using elastic force of an elastic member when the first rotor is in the first rotation position, and moves the transmission member to the non-transmission position against the elastic force of the elastic member by rotation of the first rotor from the rotation position.