Image formation control method and image forming apparatus

An image formation control method for controlling an image forming apparatus including:

• a roll paper supply device configured to roll out roll paper and cut a rolled-out portion of the roll paper to produce a first sheet of a specific size, and convey the first sheet toward a print position;
• a cut sheet supply device configured to convey a second sheet of the specific size accommodated in an accommodating portion toward the print position;
• and a printing device configured to execute a print process of forming an image on the first sheet or the second sheet at the print position, the image formation control method comprising:
• when continuous print processing in which the print process is repeated a plurality of times is executed,
• determining, by a control device, whether or not the roll paper supply device is in a specific state in which the roll paper supply device has conveyed the first sheet to a specific position, for each of the print processes;
• causing, by the control device, the roll paper supply device to execute a process of conveying the first sheet toward the print position when it is determined that the roll paper supply device is in the specific state, for each of the print processes;
• and
• causing, by the control device, the cut sheet supply device to execute a process of conveying the second sheet toward the print position when it is determined that the roll sheet supply device is not in the specific state, for each of the print processes.