| 摘要 |
In a thermal fixing device for an image forming apparatus, when a heat roller starts to be heated, a warm-up time matching the instantaneous roller temperature can be set and controlled with accuracy. The interval between the start of a paper after the start of a recording operation and the arrival of the paper at the fixing device is available for the elevation of the roller temperature to a fixable temperature. A period of time necessary for the roller temperature to reach a temperature at which the recording operation can be started is corrected on the basis of the instantaneous ambient temperature. The device therefore reduces the waiting time up to the time when the surface of the heat roller reaches a fixable temperature, and can control the surface of the heat roller to a stable fixable temperature.
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