Patent ID: 8913309

Claim:
An image reading apparatus comprising: an image reading portion configured to read an image formed on a sheet; a supporting portion on which a plurality of sheets, of which images are to be read by the image reading portion, are to be supported; a separation and feed portion configured to separate the plurality of the sheets supported on the supporting portion into each sheet, and to feed the sheet to a sheet conveying path configured to guide the sheet to the image reading portion; a first regulation member and a second regulation member provided on both sides of the plurality of sheets supported on the supporting portion in a width direction orthogonal to a feed direction of the plurality of sheets; a rotating member to be rotated by being pushed by at least one sheet of the plurality of sheets supported on the supporting portion, the rotating member including a first portion to be contacted with the at least one sheet and a second portion to be contacted with the at least one sheet; and a sensor portion configured to generate a signal in accordance with a rotation of the rotating member, wherein the first portion is provided so that a position of the first portion in the width direction is located between the first regulation member and the second regulation member when both edges of a sheet having a feedable minimum width are supported on the supporting portion, and the second portion is provided so that, when sheets having different widths are supported on the supporting portion with each having one edge being aligned with the first regulation member and another edge of a sheet having a smaller width than the sheets supported on the supporting portion is located on a side of the first regulation member with respect to the first portion, a position of the second portion in the width direction is located between the other edge of the sheet having the smaller width supported on the supporting portion and the first regulation member.