Lexmark International, Inc.

Todd Lucas Janes

Donald Wayne Stafford

Peter E Wallin

Alexander D Meade

Ronald Lloyd Roe

Johnny Dale Massie, Ii

Jean Marie Massie

Pramod K Sharma

David Daniel Dreyfuss

Bradley Leonard Beach

Ashok Murthy

Benjamin Keith Newman

Alan Stirling Campbell

Jeanne Marie Saldanha-Singh

Chris Anthony Burdette

Jerry Wayne Calia

Joan Marie Massie

A toner cartridge has a comminuator that prevents the buildup of toner behind the doctor blade that meters the toner delivered to the developer roller for later image development and printing. The comminuator is mounted to, and for movement with, an agitator adjacent to an exit port of the toner hopper. A paddle that rotates within the toner hopper contacts the agitator and generates joint movement of the agitator and comminuator. The comminuator comprises a plurality of spaced blades held by a coupler mounted to the agitator. Alternatively, the comminuator comprises a wire mounted in opposing connectors mounted to the agitator.

Toner cartridge with pre-doctoring comminuator

An electrophotographic developer roller with a highly resistive layer over a conductive core is made by mixing polyurethane and ferric chloride. After curing, the roller is soaked in hydrogen peroxide to oxidize the outer surface. The oxidized surface layer is electrically resistive. An excellent developer roller is achieved at low production cost.

Polyurethane roller with oxide surface layer

An electrophotographic developer roller is made by casting urethane prepolymer mixed with a butadiene, a trifunctional curative and ferric chloride powder. After curing, the roller is baked, which oxidizes the outer surface. The oxidized surface layer is electrically resistive, which is desirable in a developer roller. An excellent developer roller is achieved at low production cost.

Process of making a polyurethane roller with high surface resistance

Polyurethane roller with high surface resistance

In imaging apparatus (1) a contact heater (9) applies heat and electrical bias to a toner image on an intermediate accumulator (5). The bias is of polarity to repel the toner. The toner image is coalesced such that additional heating may be reduced or eliminated at the transfer to paper (7) by pressure roller (11).

Color imaging with contact transfer heating station

A printer or other imaging apparatus (1) in which two or more images in registration are transferred from a photoconductor (3) to an intermediate transfer drum (5). The transfer drum has very stable resistivity, which is achieved by the body of the drum being cesium iodide filled polyurethane.

High stability color imaging by transfer roller

An electrophotographic printer employs a intermediate transfer roller of a copolymer of urethane and silicone carbinol. Transfer efficiency is excellent over a period normally coinciding with the full life of a printer or other imaging device.

Polymeric toner transfer member material

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Lexington, KY, United States of America

Todd Lucas Janes