| 摘要 |
PURPOSE:To prevent dew condensation and high humidity troubles, by controlling 2 groups of heaters with a control system provided with a humidity detector and 2 temperature detectors to adjust humidity in a copier. CONSTITUTION:Humidity detector 11 with reference humidity set to H1 and 2 temperature detectors with referance temperatures set to T1 and T2 are provided in a copier, and when the temperature in the copier is lower than T1, heaters 12 and 13 of group 1, and heater 14 of group 2 are both runned. When the temperature is highter than T1 and lower than T2 and the humidity in the copier is higher than H1, only heater 14 is runned to prevent dew formation on fixing roller 6 or the like of optical system 8, solidification of a developer, jamming and wrinkling of copy paper due to moisture absorption, transfer efficiency deterioration, or other troubles. |
