Patent ID: 8820732

Claim:
An image forming apparatus comprising: a first sheet storage unit configured to store a plurality of sets of first sheets, each set including a plurality of the first sheets; a second sheet storage unit configured to store a plurality of sets of the first sheets, each set including a plurality of the first sheets; another sheet storage unit configured to store second sheets; an inserting unit configured to insert at least a part of the first sheets of a set fed from the first sheet storage unit into the second sheets fed from the another sheet storage unit to produce first printed sheets, and following the first printed sheets, insert at least a part of the first sheets of a set fed from the second sheet storage unit into the second sheets fed from the another sheet storage unit to produce second printed sheets; and a discharge control unit configured to control to discharge surplus first sheets among the sets in the first sheet storage unit and surplus first sheets among the sets in the second sheet storage unit after the second printed sheets have been produced.