Patent ID: 8542416

Claim:
An image processing apparatus capable of reading an image recorded on a first surface and a second surface of a sheet, the image processing apparatus comprising: a U-turn conveying path comprising: a first conveying path formed in a substantially plate shape; a second conveying path disposed below the first conveying path; and a curved conveying path disposed between the first conveying path and the second conveying path, an upper cover configured to rotate between a closed position where the first conveying path is partly covered and an open position where the first conveying path is exposed, wherein at least the first conveying path is exposed when the upper cover is in the open position; a first image reading section disposed below the first conveying path and configured to read the image recorded on the first surface of the sheet conveyed along the first conveying path; a second image reading section disposed below the second conveying path and configured to read the image recorded on the second surface of the sheet conveyed along the second conveying path; a first conveying roller positioned upstream of the first conveying path in a conveying direction and configured to nip and convey the sheet to the first conveying path; a second conveying roller positioned at a boundary between the first conveying path and the curved conveying path and configured to nip and convey the sheet to the curved conveying path, wherein the second conveying roller unnips the sheet when the upper cover is in the open position; a third conveying roller positioned downstream of the curved conveying path in the conveying direction and configured to nip and convey the sheet to the second conveying roller; a fourth conveying roller positioned downstream of the second conveying path in the conveying direction and configured to discharge the sheet from the second conveying path; and a control unit configured to control to stop conveying the sheet when a back edge of the sheet passes the first conveying roller in the case where a length of the sheet in the conveying direction is less than a first distance between the first conveying roller and the third conveying roller along the conveying direction and to stop conveying the sheet after conveying the sheet in the conveying direction until the back edge of the sheet passes the third conveying roller in the case where the length of the sheet in the conveying direction is greater than the first distance and is less than a second distance between the third conveying roller and the fourth conveying roller along the conveying direction.