Patent ID: 8666286
Filing Date: 2014-03-04
Classification: H04N

Abstract:
1. An image reading device comprising: a carriage configured to reciprocate between a first end and a second end in a moving direction to read a document sheet; a motor configured to supply a driving force to move one of the carriage and a movable member other than the carriage; an input gear configured to rotate upon receiving the driving force from the motor; an output gear configured to output a rotational force toward the carriage; a planetary gear configured to rotate in engagement with the input gear, the planetary gear being supported to be swingable around a rotational center axis of the input gear between a position where the planetary gear engages with the output gear and a position where the planetary gear is separated from the output gear; an intermediate gear movable between an engagement position where the intermediate gear engages with the output gear and a separated position where the intermediate gear is separated from the output gear, the intermediate gear being configured to, when being in the engagement position, engage with the planetary gear, reverse a rotational direction of the driving force transmitted to the planetary gear, and transmit the driving force to the output gear; a displacement mechanism configured to apply an urging force to urge the intermediate gear toward the engagement position and move the intermediate gear in response to movement of the carriage; and a controller configured to control the motor, wherein, when the carriage is moved from the first end to the second end in the moving direction, the displacement mechanism moves the intermediate gear from the engagement position to the separated position in response to the movement of the carriage, and the controller controls the motor to rotate in a first direction so as to transmit the driving force from the motor to the output gear via the input gear and the planetary gear, and wherein, when the carriage reaches the second end in the moving direction, the controller controls the motor to: