Patent ID: 8096543

Claim:
A post-processing apparatus which is connectable to an image forming apparatus that forms an image on a paper sheet, the post-processing apparatus comprising: a first conveyance section which superposes a plurality of paper sheets conveyed from the image forming apparatus, and which is provided with a conveyance path for conveying the plurality of superposed paper sheets toward a downstream side; a second conveyance section which conveys the plurality of paper sheets conveyed from the image forming apparatus, sheet by sheet toward the downstream side; a switching section which switches to convey the plurality of paper sheets either to the first conveyance section or to the second conveyance section; a punch processing section which: (i) is provided at the downstream side of the first and second conveyance sections, (ii) temporarily stops the plurality of paper sheets conveyed from the first or the second conveyance section on a conveyance path, and (iii) executes punch processing to form punch holes in the plurality of paper sheets; and a control section which controls the switching section and the punch processing section, wherein when it is determined, based on basis weight information or thickness information of the paper sheet, that the punch processing is not executable at the punch processing section on the plurality of superposed paper sheets, the control section controls the switching section and the punch processing section to convey the plurality of paper sheets into the second conveyance section, and to execute the punch processing sheet by sheet on the plurality of paper sheets.