| 摘要 |
A rotation speed of a heating roller 39 a and a pressure roller 39 b is variably controlled by a CPU 542 based on a sheet size to be printed, a direction the sheet is to be passed, and a number of sheets to be printed. Specifically, variable control of the rotation speeds of the heating roller 39 a and the pressure roller 39 b by the CPU 542 is based on an occurrence of a pass-through area 39 b 1 and a non-pass-though area 39 b 2 by a sheet of recording paper with respect to a roller lengthwise direction (axial direction) of a position at which the sheet of recording paper passes between the heating roller 39 a and the pressure roller 39 b, and controlled based on a thermal expansion coefficient of a roller diameter of the non-pass-though area 39 b 2 of the pressure roller 39 b. |
