Patent ID: 8477391

Claim:
An image reading apparatus, comprising: a reading unit having a reading surface configured to read a document; a document feeding unit including a document tray and a roller, configured to perform document feeding with respect to the reading surface, wherein the roller is capable of shifting between an initial position where the roller is apart from the document tray and a contact position where the roller contacts a one of documents stacked on the document tray, and the roller feeds the document at the contact position; and a control unit configured to execute positional initialization of the roller by shifting the roller to the initial position, the control unit having a first timer configured to start measuring a first elapsed time in response to a completion of document reading by the reading unit and a second timer configured to start measuring a second elapsed time in response to a completion of the positional initialization of the roller, wherein, the control unit executes the positional initialization of the roller when either when the first elapsed time exceeds a first predetermined time or when the second elapsed time exceeds a second predetermined time, and the control unit resets the second timer and makes the second timer start measuring again in response to the completion of the positional initialization, and in a case where document reading by the reading unit is performed before the first elapsed time exceeds the first predetermined time, the control unit resets the first timer and makes the first timer start measuring again in response to the completion of the document reading.