Patent ID: 7603072

Claim:
An image forming apparatus, comprising: a first supply section which supplies a first-type special sheet of a first special sheet group, the first special sheet group including first special sheet sets, each set of which containing a plurality of different kind of first-type special sheets arranged in a predetermined order; a second supply section which supplies a second-type special sheet of a second special sheet group, the second-type special sheet of the second special sheet group being to be inserted between first-type special sheets of the first special sheet group, the second special sheet group including second special sheet sets, each set of which contains a plurality of different kind of second-type special sheets arranged in a predetermined order; a stacking section which stacks the first-type special sheet supplied by the first supply section and the second-type special sheet supplied by the second supply section; a conveyance section which conveys at least one second-type special sheet of the second special sheet group so as to be inserted between two first-type special sheets supplied by the first supply section on the stacking section; and a control section which controls the second supply section and the conveyance section so that a rest of second-type special sheets which belong to the same set as a second-type special sheet having been last supplied by the second supply section is supplied by the second supply section and is ejected to a sheet ejection destination other than the stacking section before a second-type special sheet of the second special sheet group is inserted after the latter sheet of the two first-type special sheets supplied by the first supply section.