Patent ID: 7869105
Filing Date: 2011-01-11
Classification: H04N

Abstract:
1. A transmission, comprising: a sun gear forwardly and reversely rotatable by a driving force transmitted from a driving source; a rotary member provided to be forwardly and reversely rotatable about a same rotation axis as a rotation axis of the sun gear, and having a projecting portion projecting radially outwardly at a predetermined position thereof; a clutch configured to cause the rotary member to be forwardly rotated by a forward rotation of the sun gear and reversely rotated by a reverse rotation of the sun gear, and not to cause the rotary member to be reversely rotated when a load having a predetermined torque is applied to the rotary member, a planetary gear which is rotatably supported by the rotary member, meshed with the sun gear, revolved around the sun gear by a rotation of the rotary member, and rotated by a rotation of the sun gear in a case in which the rotation of the rotary member is inhibited; a transmission gear which is meshed with the planetary gear and rotated by a rotation thereof, when the planetary gear is positioned at a predetermined revolution position thereof; a stopper configured to inhibit the rotary member from being reversely rotated at a first rotation position thereof in which the planetary gear is positioned at the predetermined revolution position; a switch including a switch lever which the projecting portion contacts when the rotary member is rotated, and being configured to detect, by utilizing a swinging of the switch lever, a second rotation position of the rotary member based on which the rotation of the rotary member is changed from a forward rotation thereof to a reverse rotation thereof, the switch being configured to permit the swinging of the switch lever caused by the projecting portion when the rotary member is forwardly rotated and to restrict the swinging of the switch lever caused by the projecting portion when the rotary member is reversely rotated; and a saving mechanism which saves the switch lever from being forcedly swung by the projecting portion when the rotary member is reversely rotated.