| 摘要 |
PROBLEM TO BE SOLVED: To make toner concentration the same in the developing device of a cartridge where at least a photoreceptor drum and a developing device are integrally constituted even when the toner concentration in the developing device of the new cartridge after exchange is different from that in the developing device of the cartridge before exchange in the case of exchanging the cartridge. SOLUTION: As to this image forming device, the photoreceptor drum, the electrifying device and the developing device of each image forming part are integrally constituted as cartridges 51a, 52a, 53a and 54a respectively, and can be attachably/detachably attached to a device main body A. Even when the toner concentration in the developing device of the new cartridge after exchange is different from that in the developing device of the cartridge before exchange in the case of exchanging the optional cartridge out of the cartridges 51a, 52a, 53a and 54a, operability in the case of inserting the cartridge is improved and the toner concentration is kept constant to obtain a high-quality image by controlling so that the toner concentration in both developing devices may be the same by a controller provided in the device main body A. |
