Browse Prior Art Database

Original Publication Date: 1995-Aug-31
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal


Many electrostatographic printing machines include a replaceable toner cartridge for permitting a customer to replace the toner cartridge at the end of its service life. Replaceable toner cartridges generally include an electrical contact for enabling communication with the machine controller to indicate that the toner cartridge is, in fact, situated within the machine housing or to provide a signal that the toner supply is low. Although a customer replaceable toner cartridge feature provides convenience for the customer, this feature also tends to exacerbate toner contamination problems within the developer cavity. Toner contamination can be caused by toner particles escaping from the developer housing when the toner cartridge is removed, toner becoming airborne due to improper mating between the developer housing and the toner cartridge, or improper installation of the toner cartridge by the customer, among other factors. Contamination due to airborne toner particles results in nonuniform exposure, increased background, and generally unacceptable copy quality, as well as unscheduled maintenance and repair by skilled service technicians.