Patent ID: 8585033

Claim:
A sheet post-processing apparatus comprising: a carry-in portion that carries a sheet from an image forming apparatus capable of forming an image on the sheet; a guide portion that guides a sheet bundle including the sheet carried from the carry-in portion to a processing position; a command input unit that accepts input of a manual execution command; a post-processing unit that performs a predetermined post-process on the sheet bundle disposed at the processing position based on the manual execution command entered through the command input unit; a guide controller that is connected to the image forming apparatus in a signal-receivable manner to receive sheet size information in an image formation period of the image forming apparatus and to control driving of the guide portion to change a guide size based on the received sheet size information so as to match the guide size with sheet bundles having different sheet sizes; and a plurality of ejected sheet trays for sheet ejection, wherein, in the case where the image forming apparatus includes a selection input unit for allowing selecting whether or not controlling of driving of the guide portion is to be performed together with setting for an image formation, when selection is made through the selection input unit to perform the controlling of driving, the guide controller controls the driving of the guide portion based on the sheet size information in the image formation period, wherein the selection input unit is configured such that any one of the ejected sheet trays for sheet ejection can be selected, wherein selecting of the controlling of the driving is selecting of an ejected sheet tray for sheet ejection performed through the selection input unit, and wherein, in the case where a predetermined ejected sheet tray is selected through the selection input unit, the guide controller controls the driving of the guide portion based on the sheet size information of the image formation period.