Patent ID: 7924475

Claim:
An image reading apparatus comprising: a first feed path connected to a inlet from an outlet via a scanning position; a second feed path whose one end is connected to the first feed path at a connecting position on a feed-direction downstream side of the scan point; a detection unit that detects a presence or absence of a document; a feed system provided at least on the first feed path; an image scanning unit that scans an image of a document fed by the feed system at the scanning position; a switching unit that is provided at the connecting position and that switches a document feed path to either the second feed path or to an outlet; a drive source that is controlled so as to be rotary-drivable in both forward and backward directions and that applies a drive force to at least the feed system and the switching unit; a drive force transmission unit that transmits a drive force to switch the document feed path to the document discharge path side from the drive source to the switching unit based on a one-direction rotation of the drive source, transmits a drive force to switch the document feed path to the second feed path side from the drive source to the switching unit based on an other-direction rotation of the drive source, and transmits a document-feed-direction drive force irrespective of the rotation direction of the drive source; a control unit that has a first mode that feeds a document from the first feed path to the document discharge portion by rotating the drive source in one direction and a second mode that feeds a document from the first feed path to the second feed path by rotating the drive source in the other direction, and switches a current mode from the second mode to the first mode by controlling the rotation direction of the drive source based on a detection result by the detection unit during the document fed in the second mode; and an image modification unit that modifies the image read by the image read unit based on drive loss information acquired with regard to a drive loss of the drive force transmission unit occurring at a time of switching the current feed mode by the control unit.