| 摘要 |
An image reading apparatus, including: an image reading portion; a tray; a first regulation member movable in a width direction on the tray; a second regulation member movable in association with the first regulation member; a first and a second rotating portions rotated by the sheet on the tray; and a sensor portion configured to generate a signal based on rotations of the first and second rotating portions, wherein the first rotating portion is located between the first regulation member and the second regulation member which regulate both edges of a sheet having a minimum width; and the second rotating portion is located between the other edge of a sheet having a smaller width and the first regulation member when sheets having different widths are supported on the tray with each one edge being aligned with the first regulation member. |
