| 摘要 |
PURPOSE: To obtain a stable gradation and a required sufficient image density, without providing a special time by executing a preparation process through the use of a warming-up time until the temperature of a fixing unit rises. CONSTITUTION: The fixing unit 37 is provided with upper and lower rollers as a pair of fixing rotary bodies and a heater 37D, the ambient temperature of them is detected by a temperature sensor 37C and transmitted to a CPU 90 and it controls the heater 37D to hold the temperature at the tolerance level of a prescribed temp. being the stable control temp. with the detection signal. Then, each correction is performed according to the program previously set when power is supplied, in order of the initialization of process data corresponding to temperature, humidity and the number of copies, the adjustment of laser power, the state preparation of photoreceptor drum and developer, toner concentration control and the storage of maximum density and gradation correcting curves. |
