Patent ID: 7721867

Claim:
A rotation output device, comprising: an output conveyance mechanism including a rotation driving member for outputting a rotation driving force and a rotation output member for outputting a rotation force in response to the driving of the rotation driving member, wherein the rotation driving member and the rotation output member are coaxially connected to each other so as to convey the rotation force, and wherein the rotation force is conveyed with a predetermined play angle such that the rotation force is not conveyed in a relative rotation direction within the predetermined play angle; a lock mechanism including a fixing member with teeth, wherein the fixing member is located on an outer circumferential surface of the rotation output member, a movable lock member with teeth and projecting pins for locking a rotation conveyed from the rotation output member when the movable lock member enters into a pressed state by being pressed toward the fixing member by the rotation output member, wherein the rotation output member and the fixing member are provided to face each other and, in an unlocked state, are provided to be separated by a predetermined distance in a radial direction; a lock operation member operable to press the movable lock member toward the fixing member by the rotation conveyed from the rotation output member to enter a locked state; a release member capable of releasing the pressed state of the movable lock member by the rotation conveyed from the rotation driving member and thus capable of releasing the locked state; and retaining means provided between the movable lock member and the fixing member and including guide holes engageable with the projecting pins, wherein the retaining means are operable to retain the position of the movable lock member in the rotation direction when receiving the rotation from the rotation output member.