Patent ID: 8804211

Claim:
An image reading apparatus comprising: a reading unit configured to read a document on a platen; a feeding mechanism configured to convey a document when reading a document that is conveyed onto the platen in which the reading unit is fixed at a predetermined position; a moving mechanism configured to move the reading unit when reading a document that is placed on the platen in which the reading unit is moved within a reading region that is separated from the predetermined position; a driving source that is shared by the moving mechanism and the feeding mechanism; a biasing mechanism that includes an elastic member and is configured to move the reading unit to the predetermined position by a biasing force of the elastic member in a case where the reading unit is moved from the reading region out of the reading region by the moving mechanism; a transmission element configured to be displaced by the movement of the reading unit, and to switch between transmission of the drive force of the driving source to the moving mechanism and transmission of the drive force of the driving source to the feeding mechanism; and, a disengaging mechanism configured to disengage the reading unit that is in the predetermined position to the reading region from the predetermined position by the drive force of the driving source.