Patent ID: 8837017

Claim:
An image reading apparatus, comprising: a stacking unit in which documents are stacked; a regulating unit configured to regulate an edge of the document in a width direction orthogonal to a conveyance direction of the document stacked in the stacking unit; a separation-feeding unit configured to separate and feed the document stacked in the stacking unit; a reading unit configured to read an image of the document fed by the separation-feeding unit; a leading edge detecting unit configured to detect a leading edge of the document fed by the separation-feeding unit; a setting unit configured to set a mixture of different widths that a plurality of documents stacked in the stacking unit are different in size in the width direction; and a control unit configured to suspend an operation of the separation-feeding unit in feeding operation in a case where the control unit determines that an inclined amount of the leading edge of the fed document based on a signal from the leading edge detecting unit is larger than a setting value, and to set, in a case where a mixture of different widths is set to the setting unit, the setting value larger in comparison with a case where a mixture of different widths is not set.