Patent ID: 8141862

Claim:
A sheet post-processing apparatus comprising: an open-close door arranged to be capable of being opened and closed; a stapler which executes a staple processing to a bundle of sheets; a staple jam detection section which detects a staple jam where a staple is not properly punched out from the stapler; a stapler moving section which moves the stapler to an access position disposed close to the open-close door; a stacker which holds the bundle of sheets to be stapled; a sheet sensor which detects at least whether a sheet exist on the stacker; and a controller which controls the stapler moving section, wherein when the staple jam detection section detects a staple jam and the sheet sensor detects that there is no sheet on the stacker, the controller controls to operate the stapler moving section to move the stapler from a home position to the access position, and wherein, when the staple jam detection section detects the staple jam and the sheet sensor detects the sheet on the stacker, the controller prevents the stapler from moving to the access position.