| 摘要 |
PURPOSE:To apply a pressure on a fixing roller only in the case of being needed and to prevent a paper and a fixing device from being pressurized more than needed by utilizing ultrasonic vibration in order to press fixing a powder image. CONSTITUTION:The above device is provided with the fixing roller 10, a pressing roller 20 which is arranged opposite to the fixing roller 10, a rotary driving mechanism 30 for rotating the fixing roller 10 and the pressing roller 20 and ultrasonic wave generators 40 and 41 which are fixed on the fixing roller 10. And the paper 50 on which the powder image is placed is transferred between the fixing roller 10 and the pressing roller 20, and then, the ultrasonic wave is generated by the ultrasonic wave generators 40 and 41 so as to fix the powder image on the paper 50. The generation and stop of the ultrasonic wave can be electrically controlled in the ultrasonic generators 40 and 41 in such a way, so that the ultrasonic wave can be generated in accordance with image information only in the case of being needed.
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