Patent ID: 7658379

Claim:
A sheet conveyance apparatus comprising: a reference member disposed in a sheet conveyance direction so as to align a side of a sheet along the reference member; a pair of first skew rollers configured to obliquely convey the sheet toward the reference member by a nip portion of the first skew rollers; a pair of second skew rollers positioned on an upstream side of the first skew rollers and farther from the reference member than the first skew rollers, at a position corresponding to a central position of the sheet in a direction perpendicular to the sheet conveyance direction, and configured to obliquely convey the sheet toward the reference member by a nip portion of the second skew rollers; a contact/separation mechanism configured to bring the pair of the second skew rollers into contact to form the nip portion so as to convey the sheet or separate to release the nip portion; a first adjustment unit configured to adjust a distance between the second skew rollers and the reference member in the direction perpendicular to the sheet conveyance direction, wherein the first adjustment unit moves the second skew rollers to a predetermined position, which corresponds to a central position of the sheet in the direction perpendicular to the sheet conveyance direction, according to the size of a conveyed sheet; and a control unit configured to control the contact/separation mechanism to cause the second skew rollers to form the nip portion from a separated state at a timing when the sheet, which is not nipped by the second skew rollers and is being conveyed in the sheet conveyance direction, reaches the first skew rollers.