| 摘要 |
PURPOSE:To reduce the fluctuation of toner concn. and that of the characteristic of a magnetic carrier and to form an image of superior quality by adjusting the amount of travel of a residual developer and the refilling amount of an unused developer corresponding to detected developer concn. housed in a developing means. CONSTITUTION:The transfer operations of the unused developer in a developer cartridge 10a and the residual developer in a developer reclaimer 12 released to a developing device 5 can be detected with the detection signal of a developer concn. detector. Then, the amount of transfer to be transferred from a developer returning means 11a to the developing device 5 and the amount of refilling of the unused developer to be refilled from a refilling device to the developing device 5 are adjusted corresponding to the detected developer concn. At this time, the image realized as an actual image with the developing device 5 is transferred to a subject to be transferred with a transfer device 6, and a cleaning device 8 eliminates the residual developer. In such a way, the developer concn. in the developing device 5 can be stabilized, and the fluctuation of the characteristic of the magnetic carrier can be reduced, which forms the image of superior quality. |
