| 摘要 |
PURPOSE:To facilitate the duration of the waiting time and thus ensure an effective use of the time, by providing the display means which detects the temperature at the fixed position of a fixing device and then varies the state of display according to the detected temperature. CONSTITUTION:The output of the temperature detection element Th of the heat roller is connected to the positive input terminals of the comparators C1-C5 each via the amplifier A. At the same time, the partial pressure voltage V1-V5 of each constant voltage VCC are supplied to the negative input terminals each. Then the output is turned to H when the output voltage of the amplifier A becomes higher than the reference voltage V1-V5 each. The reference voltage V1 is set so that the lamp L1 glows when the electric conduction is started to the heater H. The voltage V2 shows the voltage at the moment when the temperature T1 is detected. Thus the lamps L2 and L1 are turned on and off each when the detected temperature becomes higher than the temperature T1. After this, the lamps L2-L4 are turned on and off in the same way, and the last lamp L4 is turned off when the detected temperature reaches T1. At the same time, the display WAIT is also turned off. |
