Method of switching trays for feeding inter sheets in image forming apparatus

An image forming apparatus comprising:

• a receiving unit configured to receive a print job;
• an image forming unit configured to form an image on a sheet in accordance with the print job received by the receiving unit;
• a conveyance unit configured to convey the sheet outputted from the image forming unit;
• a discharge unit configured to discharge the sheet conveyed by the conveyance unit;
• an inserter which is provided downstream of the image forming unit in a sheet conveyance direction and has a plurality of feed trays, and is configured to feed inter sheets placed on each of the feed trays toward the conveyance unit;
• an operation unit configured to receive a setting of one of a first mode for permitting automatic switching of the plurality of feed trays and a second mode for prohibiting automatic switching of the plurality of feed trays;
• and
• a control unit configured to control the inserter to feed an inter sheet from a feed tray designated by the print job received by the receiving unit,
• wherein in a case where an inter sheet on the designated feed tray during the execution of the print job has run out, and when the setting received via the operation unit is for the first mode, the control unit switches a feed source from the designated feed tray to another feed tray on which an inter sheet of the same size has been placed and continues the execution of the print job, and when the setting received via the operation unit is for the second mode, interrupts the execution of the print job without switching the feed source from the designated feed tray to another feed tray, and
• in a case where a plurality of feed trays are designated as a feed source for feeding an inter sheet in the print job, the control unit interrupts the execution of the print job without switching the feed source from the feed tray in which the inter sheet has run out to another feed tray even if the setting received via the operation unit is for the first mode.