Image forming apparatus with process-cartridges

Details Image forming apparatus with process-cartridges Image forming apparatus with process-cartridges

Filed on

1989-06-14

Date issued

1991-05-21

Examiner

Braun, Fred L.

Patent Class

Photocopying

SubClass

Contact printing

SubSubClass

Light boxes

Other Related Categories

355245, 355260, G03G 1506, G03G 2100

Type

Patent

Status

active

Patent number

050179624

Description

ABSTRACT:
An apparatus for the formation of images which includes two process-cartridges, one of which is a photosensitive cartridge including a photosensitive drum, a charger, a cleaning device, and the like, and the other of which is a developing cartridge including a developing device, a toner storage container, and a used toner collecting container; the developing cartridge being separated into a first cartridge including the developing device alone and a second cartridge including the toner storage container and the used toner collecting container, where the lifetime of the photosensitive cartridge is a first integer times the lifetime of the first cartridge, and the lifetime of the first cartridge is a second integer times the lifetime of the second cartridge, where each of the first and second integers is greater than one.

REFERENCES:
patent: 4089601 (1978-05-01), Navone
patent: 4607939 (1986-08-01), Saito
patent: 4660960 (1987-04-01), Fukunaga et al.
patent: 4821063 (1989-04-01), Kaneshige
patent: 4849791 (1989-07-01), Hagihara et al.

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