| 摘要 |
A temperature control operation for a fixing device is performed based on a vertical synchronous signal Vsync periodically outputted in association with a cycling motion of an intermediate transfer belt. Furthermore, the temperature control operation provides a constant time difference Deltat 1 between a leading edge of the vertical synchronous signal Vsync and a start of energization of a heater. Therefore, a period of the vertical synchronous signal Vsync coincides with a period of the temperature control operation corresponding to each vertical synchronous signal Vsync. In addition, a constant time period is provided between the start of energization and an actual arrival of a recording medium at a nip and hence, the temperature of a heating roller can be maintained at an optimum level during the passage of the recording medium through the nip.
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