Magnetic toner use in a non-contact cleanerless system

Details Magnetic toner use in a non-contact cleanerless system Magnetic toner use in a non-contact cleanerless system

2002-10-25

2003-09-16

Lee, Susan S. Y. (Department: 2852)

Electrophotography

Having particular structure

Remanufacturing

Reexamination Certificate

active

06621996

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to laser printers.
BACKGROUND
A conventional technology, laser printer toner cartridge typically uses a statically charged organic photoconductive (OPC) drum that changes charge where it is exposed to light. The drum typically has an evenly distributed negative charge until a laser draws an image or text on it. Those areas of the drum on which the image or text are drawn are now neutrally or positively charged.
A developer roller picks up toner from a toner hopper in the cartridge. The toner contains magnetic particles that are typically negatively charged. As the photoconductive drum rotates past the developer roller, the negative toner particles are attracted and move to the neutral or positive image on the photoconductive drum. The photoconductive drum then transfers the toner particles now moved to the positively charged image on to a negatively charged print media where they are fused in place. A cleaning blade removes the remaining toner particles from the photoconductive drum and places them in a waste hopper. The charges on the surface of the photoconductive drum are then returned to an evenly distributed negative state by contact with a primary charge roller. Newer technology toner cartridges do not use a cleaning blade or waste hopper for removing excess toner from the photoconductive drum. These types of cartridges are typically referred to in the art as noncontact cleanerless cartridges.
SUMMARY
The present invention encompasses a method for converting a cleanerless toner cartridge to a conventional toner cartridge. The method comprises removing an injection charging roller from an injection charging roller area in the cartridge. A primary charge roller is added in place of the injection charging roller. A cleaning blade is added such that the cleaning blade is close enough to an organic photoconductive drum in the cartridge to remove toner material into the injection charging roller area. The cleanerless toner that has conductive particles is replaced with toner that has magnetic particles.
Further embodiments of the invention include methods and apparatus of varying scope.


REFERENCES:
patent: 5870654 (1999-02-01), Sato et al.
patent: 6041209 (2000-03-01), Murata
patent: 6144824 (2000-11-01), Hashimoto et al.
patent: 6400919 (2002-06-01), Inoue et al.
patent: 6493526 (2002-12-01), Sato

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