Patent ID: 8172713

Claim:
A rotation output device, comprising: a rotation input body configured to input a rotation driving force and having an arc-shaped groove; a rotation output body located coaxially with the rotation input body and configured to receive a driving force from the rotation input body with a predetermined play angle and to output a rotation force; a fixing member provided around an outer circumferential surface of the rotation output body and restricted from rotating; a guide holding plate fixed to the rotation output body and configured to rotate integrally with the rotation output body; a relative rotation means fixed to the rotation output body and configured to rotate the guide holding plate with respect to the rotation input body, wherein the relative rotation means includes an elastic spring arm with a hook protruding radially outward and being engageable with the arc-shaped groove, wherein the hook engages the arc-shaped groove when the rotating input body ceases rotation, and remains flexed inward and disengaged from the arc-shaped groove while the rotating input body inputs a driving force; a movement locking plate that is held by the guide holding plate, wherein the movement locking plate is configured to be urged radially outward and to fixedly engage the fixing member; a lock operation groove provided in the guide holding plate and configured to release the movement locking plate radially outward to fixedly engage the movement locking plate with the fixing member; and a release operation groove provided in the rotation input body and configured to guide the movement locking plate radially inward and to release the movement locking plate from the fixed engagement with the fixing member by the rotation of the rotation input body; wherein the relative rotation means is configured to relatively rotate the guide holding plate upon stoppage of the rotation driving of the rotation input body.