| 摘要 |
PROBLEM TO BE SOLVED: To form an image stable in density by providing a recording means for recording the changes in the lapse of time of various kinds of environments, detected with first and second detecting means and a control means for controlling a transferring condition with a transfer means and an attracting condition with an attracting means based on the record by the recording means. SOLUTION: A CPU 14 controls the outputs of a transfer charger HV power source 212, a pretransfer charger HV power source 131 and an attracting charger HV power source 213, in accordance with the values of absolute temperatures detected by an environmental sensor 15 for detecting the absolute temp. in the vicinity of a developing unit and an environmental sensor 18 for detecting the absolute temp. in the vicinity of a paper feeding cassette, respectively. In other words, a current is always supplied to the environmental sensors 15 and 18 and the results of the detections of the absolute temperatures are written in a RAM 13 at intervals of one hour. The CPU 14 controls the attracting and transferring conditions of the recording paper, based on the written record. Thus, the states of toner and the recording paper can be recognized and an excellent transfer can be performed. |
