| 摘要 |
PURPOSE:To prevent disturbance of a toner image and mixing of wrong color toner particles and to reproduce a stable sharp color image by decreasing magnetic force exerted on the toner particles with the progress of plural image forming cycles. CONSTITUTION:An image-forming drum 1 having a photosensitive layer on the surface rotates in the arrow direction, its surface is uniformly electrostatically charged with a charger 2, imagewise exposure 3A to the first color is made, the obtained electrostatic image is developed with a developing device 4A to form the first color toner image, the drum 1 is destaticized with a destaticizer 7, and returned to the initial position. Similar processes are repeated from then, and when the fourth color toner image is formed with a developing device 4D, the superposed toner images are transferred to a recording paper P. Movement of the toner particles to the drum 1 is executed easily, and superposition of each color toner image can be carried out stably on the drum 1 by setting the magnetic force exerted on the toner particles on a developer carrying body 41 provided with magnets 42 in its inside so as to weaken in the later developing devices with the progress of image forming cycles. |
