| 摘要 |
PROBLEM TO BE SOLVED: To correctly grasp the life of a photoreceptor and to appropriately prevent fog and sticking of magnetic particles, in an image forming device employing a contact electrification system and a cleaner-less process. SOLUTION: In the image forming device provided with a function for electrifying the surface of the rotary photoreceptor drum 1 by injecting charges into the surface of the rotary photoreceptor drum 1 by a magnetic brush contact electrifier 2, device an image forming operation is stopped when the conditions (d×n×n>4,500,000,000, wherein d is average image proportion and n is the sum of inserted sheets) are satisfied and then message for urging to replace the photoreceptor is displayed. |
