Image forming apparatus

An image forming apparatus comprising:

• a sheet tray configured to accommodate a sheet;
• a print engine configured to form a toner image on the sheet;
• a conveyor configured to convey the sheet from the sheet tray toward the print engine;
• a fuser configured to fix the toner image on the sheet, the fuser including a fixing rotator and a heater configured to heat the fixing rotator;
• a temperature sensor configured to detect a temperature of the fuser;
• and
• a controller configured to perform:
• starting heating of the fixing rotator by the heater;
• starting rotation of the fixing rotator;
• determining whether an initial temperature is higher than or equal to a first temperature, the initial temperature being a detection temperature of the temperature sensor when a print instruction is received;
• in response to determining that the initial temperature is lower than the first temperature, setting a particular period to a first period;
• in response to determining that the initial temperature is higher than or equal to the first temperature, setting the particular period to a second period longer than the first period;
• and
• selecting one conveyance mode from a plurality of conveyance modes, the plurality of conveyance modes having different timings to start conveyance of the sheet by the conveyor, the selecting one conveyance mode including a first selection process of selecting the one conveyance mode based on a detection temperature of the temperature sensor from a first time point at which the rotation of the fixing rotator is started to a second time point at which the particular period elapses from the first time point,
• wherein the controller is configured to execute the first selection process based on a temperature difference between the detection temperature at the first time point and a highest temperature of the detection temperature during the particular period.