| 摘要 |
PURPOSE:To increase the number of continuous copies with small size by controlling respective heaters so as to change the ON/OFF states and duty ratios of respective heaters based on the surface temp. state of a fixing roller and transferring electric power for a paper non-feeding part to a paper feeding part. CONSTITUTION:The titled device is provided with a 1st heater 4 arranged in the paper feeding width area of a small-size sheet 3 in a fixing roller 2, 2nd heaters 6a, 6b arranged on the difference parts between the paper feeding width areas of the small-size sheet 3 and a large-size sheet 5 and a temp. detecting means 7 for detecting the fixing roller surface temp. of the 1st heater 4. When a detecting temp. based upon the means 7 is less than a previously set reference temp. at the time of feeding the small-size sheet 3, current is supplied to the 1st and 2nd heaters 4, 6a, 6b at a prescribed duty ratio by means of a control means.
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