Image forming apparatus

An image forming apparatus comprising:

• a supplying unit configured to supply a continuous recording material;
• an image forming unit configured to form an image on the recording material supplied from the supplying unit;
• a fixing unit configured to fix the image formed on the recording material by the image forming unit;
• a collecting unit configured to collect the recording material having passed through the fixing unit;
• a detecting device configured to detect a change in tension of the recording material running between the image forming unit and the fixing unit;
• a tension adjusting device configured to adjust the tension acting on the recording material such that the change in the tension of the recording material falls within a permissible range if the change in the tension of the recording material that is detected by the detecting device exceeds the predetermined permissible range;
• and
• a torque limiting member configured to prevent a torque acting on the fixing unit from exceeding an upper limit,
• wherein the tension adjusting device adjusts the recording-material-transporting speed in at least the fixing unit unless the torque limiting member is activated, and the tension adjusting device adjusts the recording-material-transporting speed in the collecting unit if the torque limiting member is activated.