Patent ID: 8783979
Filing Date: 2014-07-22
Classification: B41J

Abstract:
1. An image forming apparatus, comprising: a plurality of paper feed units configured to draw and feed, one by one, print media stacked on a paper feed table with sheet sizes different from one another; a printing unit configured to print a print medium fed by the paper feed units, based on a received print job including one of a first print job or a second print job, the first print job not including a double-sided printing request of a set of print media of a plurality of sheet sizes, the second print job including a double-sided printing request of a set of print media of a plurality of sheet sizes; a resist unit configured to transfer print medium fed from the plurality of paper feed units to the printing unit at a predetermined timing; a circulating path configured to transfer print medium printed by the printing unit at a transfer speed, the transfer speed in the first print job being determined for each sheet size; a reversal unit configured to reverse print medium transferred on the circulating path and then transfer the reversed print medium to the resist unit; a transfer schedule setting unit configured to set, when the received print job is the second print job, a transfer schedule for the set of the print media of the plurality of sheet sizes; and a control unit configured to start feeding or transfer from any one of the plurality of paper feed units or the reversal unit to the resist unit based on the set transfer schedule, wherein the transfer schedule setting unit is configured to set the transfer schedule so that before a last print medium of a first sheet size reversed by the reversal unit is transferred to the resist unit, the print medium of a second sheet size different from the first sheet size that follows the print medium of the first sheet size is fed from any one of the plurality of paper feed units to the resist unit, and wherein the transfer schedule setting unit is configured to set the transfer schedule so that: