Image forming apparatus and image forming method with temperature control

An image forming method, comprising:

• controlling, with a heater controller, a temperature of a heater heating a fixing roller that is configured to convey a sheet by rotation and to fix a recording material formed on the sheet to the sheet, wherein controlling the temperature of the heater comprises:
• determining, with a temperature determination part, whether or not an operation mode is executable based upon a fixing part temperature,
• wherein controlling the temperature of the heater by the heater controller is based upon the operation mode;
• and
• controlling, with a roller controller, a rotation speed of the fixing roller based upon a determination result of the temperature determination part;
• and
• increasing the rotation speed of the fixing roller to a value higher than a rotation speed in a case in which a fixing part temperature does not satisfy a predetermined condition when the fixing part temperature indicating a temperature of the fixing roller satisfies a predetermined condition indicating that the fixing roller is not suitable for an operation.

A method for applying two or more types of toners in a printing device, the method comprising:

• heating a fixing roller to a first temperature, the first temperature sufficient to affect a first type of toner;
• rotating the fixing roller at a first speed at the first temperature to affect the first type of toner;
• and
• cooling the fixing roller to a second temperature sufficient to affect a second type of toner by increasing a rotation speed of the fixing roller from the first speed to a second speed.