| 摘要 |
PURPOSE:To prevent deterioration of quality by warning of the lowering of discharge efficiency than a set value, if it occurs, and inhibiting successive copying over the predetermined quantity of copies. CONSTITUTION:The surface potential of a photosensitive body 1 electrostatically charged with a corona charger 3 is detected with a potential sensor 15 to estimate the discharge efficiency of the corona discharge wire 31. When the efficiency drops below a set value, a signal is sent to a display circuit 16 from a control circuit 14 to display warning to an operator, and a successive copying quantity regulating circuit 18 is actuated to inhibit successive copying over the predetermined quantity. |
