| 摘要 |
PURPOSE:To provide an electrophotographic image forming device in which a drum cartridge and developer cartridges are removable and the replacement time of a photoreceptor drum can surely be controlled. CONSTITUTION:In an electrophotographic image forming device, wherein both a drum cartridge 10 provided with a photoreceptor drum 1 and developer cartrigde 20 enclosing a developer 6 can be independently installed and removed, the drum cartridge 10 is provided with recessed portions 11-i (i=1 to (n)) by the same number as that (n) of developer cartridges 20 used within the longevity of the photoreceptor drum 1, and the developer cartridges 20-k provided by the number (m) are each provided with a projecting portion 21-k which is fitted into only the specific one 11-k((k) is a specific value from 1 to (n)) of the recessed portions 11-i when the cartridges are normally installed, and the projecting portions 21-i differ in the projecting position and are provided with a replacement time reporting means 200 so provided as to be easily removable from each developer cartridge 20-i. |
