Patent ID: 8382090

Claim:
A post-processing system comprising: an image forming section that forms an image on a sheet; a post-processing section that performs post-processing on sheets with images formed thereon, including a collecting device for setting the sheets in a bunch form, a sheet transport device for carrying the sheet with the image formed in the image forming section to the collecting device, a post-processing device for performing the post-processing on a bunch of sheets, and a stack device for holding the bunch of sheets subjected to the post-processing; and a control section that controls the image forming section and the post-processing section, including a mode selecting device for alternatively selecting an automatic post-processing mode in which the post-processing section performs the post-processing on the bunch of sheets comprising the sheets with images formed in the image forming section and set in the collecting device by the sheet transport device, or a mixing post-processing mode in which the post-processing section performs the post-processing on a bunch of mixed sheets comprising the sheets sent to the collecting device from the image forming section by the sheet transport device and a sheet manually set in the collecting device from an outside, and an operating device for outputting a set finish signal when manually setting the sheet in the collecting device is finished, wherein the control section is configured to perform the post-processing on the bunch of sheets in the post-processing device on a condition that, in the automatic post-processing mode, a print job finish signal is output from the image forming section when image formation is finished, or a condition that, in the mixing post-processing mode, after the image formation is suspended in the image forming section, a sheet is manually set in the collecting device, and after completion of the manually setting the sheet, the set finish signal is output from the operating device.