| 摘要 |
PURPOSE:To prevent reduction in an image density in the initial stage of the operation of a developing device and to properly control a toner concentration in a developer by setting the triboelectrifying quantity of toner as an initial motion developer more than that of replenished toner. CONSTITUTION:The developing device is composed of a developer tank 1, developing roller 2, toner housing hopper 3, sleeve 4, permanent magnetic member 5, doctor blade 6, mixing roller 7, and a cartridge 8. At this time, the triboelectrifying quantity of the toner as the initial motion developer is set larger than that of the replenished toner, by 2-5muc/g in an absolute value. Thus, the reduction in the image density in the initial stage of the operation of the developing device, is prevented, the toner concentration in the developer can be properly controlled, and a high quality image having a high image density can be obtained. |
