Patent ID: 7651081

Claim:
A post-processor connectable to an image forming device for forming an image on a recording sheet, comprising: a special sheet feeding tray to mount a set of a plurality of different kinds of special sheets that are disposed in a predetermined order; a conveying unit that ejects a recording sheet fed out from the image forming device to an ejection tray, and feeds a special sheet from the special sheet feeding tray and ejects the special sheet to the ejection tray, according to information inputted from the image forming device, the information indicating an insertion position of each special sheet; a jam detecting unit which detects occurrence of a jam in the post-processor; and a control unit that, when occurrence of a jam is detected by the jam detecting unit and if one or more special sheets having been fed are present in the post-processor, obtains a quantity of the one or more special sheets, and performs control, after the jam being released, to eject a special sheet or sheets as unnecessary up to one that is on the special sheet feeding tray and disposed preceding a special sheet that is of the same kind as a most front one that was present in the post-processor at the time of the occurrence of the jam.