| 摘要 |
An image forming apparatus is provided which is capable of processing a paper of a narrow width having a high using frequency at high speed by changing the feeding speed of the paper in accordance with the width of the paper. In the image forming apparatus 100 of the present invention, even with the use of a wide paper in a fixing process, the temperature at the end portions of a heating roller 7 does not rise to a high temperature beyond an allowable range, and hence the processing of image formation can be performed at high speed. In case of a narrow paper having a low using frequency, as the paper feeding speed increases, the temperature at the end portions of the heating roller is liable to rise excessively beyond the allowable range, and hence the narrow paper is fed at low speed even with a decreased efficiency based on the using frequency being low, thus preventing damage to the heating roller, etc. On the other hand, however, in case of a narrow paper having a high using frequency, when the paper feeding speed is increased, there occurs a danger that the end portions of the heating roller become a high temperature beyond the allowable range, but emphasis is placed on the high using frequency to perform high-speed processing of image formation while permitting the temperature control on the heating roller to be carried out by a fixing temperature control device 10, 20 and 25.
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