Image reading apparatus and image forming apparatus

An image reading apparatus comprising:

• a supporting portion on which a sheet is to be supported;
• a supplying portion configured to supply the sheet supported on the supporting portion;
• an image reading portion configured to read an image of the sheet supplied by the supplying portion;
• a first regulation member provided so as to be movable in a width direction orthogonal to a feed direction of the sheet, the first regulation member configured to regulate one side edge of the sheet supported on the supporting portion in the width direction;
• a second regulation member provided so as to be opposed to the first regulation member in the width direction, the second regulation member configured (i) to move in association with the first regulation member so that a midpoint between the first regulation member and the second regulation member in the width direction is located at a predetermined position, and (ii) to regulate another side edge of the sheet supported on the supporting portion in the width direction;
• and
• a sheet detecting portion configured to detect whether or not a sheet is present in a first position and a second position on the supporting portion,
• wherein the first position is set to be located between the first regulation member and the second regulation member when both side edges of a sheet having a feedable minimum width are supported on the supporting portion, and in a position within a sheet width of the sheet having the feedable minimum width from the first regulation member located on a side of the predetermined position with respect to the second position.

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, and configured to move in the width direction;
• a first rotating portion to be rotated by being pushed by at least one sheet of the plurality of sheets supported on the supporting portion;
• a second rotating portion to be rotated by being pushed by at least one sheet of the plurality of sheets supported on the supporting portion;
• a first sensor portion configured to generate a signal in accordance with a rotation of the first rotating portion;
• and
• a second sensor portion configured to generate a signal in accordance with a rotation of the second rotating portion,
• wherein the first rotating portion is provided so that a position of the first rotating 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 rotating 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 rotating portion, a position of the second rotating 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.