Image forming system and control method of the system

A method of controlling an image forming system, wherein

• the image forming system comprises:
• an image forming device that is disposed at a first conveyance path and forms an image on a recording medium that is a continuous sheet or a long sheet;
• a first conveyor that conveys the recording medium on the first conveyance path in a conveyance direction;
• an image reading device that reads the image on the recording medium at a second conveyance path on a downstream side of the first conveyance path in the conveyance direction;
• and
• a second conveyor that conveys the recording medium on the second conveyance path,
• the method comprising:
• controlling a speed of a first drive source of the first conveyor;
• and
• controlling and maintaining a torque of a second drive source of the second conveyor to be a target torque.