Patent ID: 8113510

Claim:
A sheet processing apparatus that processes sheets transported in a predetermined transport direction and stacked on a processing tray, the sheet processing apparatus comprising: a sheet moving device configured to be brought into contact with an upper surface of a sheet stacked on the processing tray and to be moved in a width direction intersecting with the predetermined transport direction to move the sheet in the width direction; an alignment member against which a side edge of the sheet moved in the width direction by the sheet moving device is brought into abutment, to align the sheet; a guide member configured to hold down the sheet from above at a predetermined position between the sheet moving device and the alignment member when the sheet moving device is in contact with the upper surface of the sheet; and a regulating member configured to regulate a movement of the guide member in the width direction by abutting against the guide member, wherein the guide member is moved integrally with the sheet moving device when the sheet moving device is moved in the width direction, wherein the guide member is configured to slide in the width direction with respect to the sheet moving device, and wherein, when the sheet moving device is moved in the width direction integrally with the guide member, and the guide member abuts against the regulating member, the guide member is maintained at a position in which the guide member abuts against the regulating member until the sheet moving device causes the sheet abut against the alignment member to align the sheet.