Patent ID: 8861050

Claim:
An image reading apparatus comprising: a reading unit configured to read an image of a document; a feeding unit configured to feed the document; a carriage configured to be moved in a predetermined direction while holding the reading unit; a motor; a motor-side transmission gear configured to transmit power supplied from the motor; a feeding unit-side transmission gear configured to transmit the power to the feeding unit when executing a feeding reading of the reading unit reading the image of the document which is fed by the feeding unit; a carriage-side transmission gear configured to transmit the power to the carriage when executing a moving reading of the reading unit reading the image of the document while moving the carriage; a switching gear configured to switch between a meshing state of meshing with the feeding unit-side transmission gear at a feeding unit-side position where the switching gear couples the motor-side transmission gear and the feeding unit-side transmission gear when executing the feeding reading and a meshing state of meshing with the carriage-side transmission gear at a carriage-side position where the switching gear couples the motor-side transmission gear and the carriage-side transmission gear when executing the moving reading; a restraint member configured to apply, to the switching gear, a restraint force for restraining the switching of the switching gear when executing the moving reading or the feeding reading; and a motor control unit configured, in a case when switching the switching gear which is restrained from switching by the restraint member between the carriage-side position and the feeding unit-side position, to execute a large torque control of controlling the motor to generate a switching torque which is larger than a moving reading torque to be generated by the motor at a time of document reading when executing the moving reading and which causes the switching gear to switch against the restraint force of the restraint member.