Lexmark International, Inc.

Bhaskar Gopalanarayanan

Ronald Lloyd Roe

Johnny Dale Massie, Ii

Kelly Ann Killeen

Bradley Leonard Beach

Donald Wayne Stafford

James Joseph Semler

Ligia Aura Bejat

David Starling MacMillan

Gerald Lee Fish

Jason Edward Gordon

Jing X Sun

Michael Craig Leemhuis

Gregory Lawrence Ream

Robert Watson McAlpine

Benjamin Alan Askren

Jarrett Clark Gayne

Ronald Willard Baker

Philip Jerome Heink

John William Kietzman

Terence E Franey

Hrishikesh Pramod Gogate

Mark Duane Foster

Matthew Joe Russell

Scott Richard Castle

Jean Marie Massie

Sean David Smith

Claudia Alexandra Marin

Robert Francis Soto

Johnathan Lee Barnes

Jenny Marie Berens

Leea Danielle Haarz

Charles Jerome Cheek

Jeremy Lavern Daum

Vernon Wayne Ulrich

Sudha Chopra

Kevin Scott Kennedy

Scott Alan Searls

Jonathan Lee Barnes

Jamie Piotrowski

Jeannette Quinn Bracken

Liam Ruan De Paor

Todd Joseph Svoboda

Jane Elece Barcelo

Chao Li

Richard Nicholas Schrantz, Jr

A method for making a developer roll by molding a metal shaft with a conductive or semi-conductive soft rubber forming a rubber core and a coating deposited on the soft rubber core wherein the coating has a conductive agent. The outer surface of the soft rubber core is modified to form an &#x2014;OH rich surface layer before the coating is deposited onto the outer surface of the rubber core to chemically bond therein.

Developer rolls having a tuned resistivity method for making

The present disclosure relates to controlling a performance characteristic of an image forming device component having a surface which may include removal of a portion of the surface to expose a plurality of voids and a surface between the voids. The surface between the voids may have a surface roughness Ra in the range of 0.1 to 5.0 microns and the relationship SA/(SA+SA) is equal to 1-50%, where SAis the surface area of the voids and SAis the remaining surface area of the component. The performance characteristic may include the control of toner mass conveyed and/or toner filming and/or the amount of residual toner removed from a photoconductive surface.

Toner mass control by surface roughness and voids

An endless electrophotographic member, such as a developer roller, which indicates an improved resistance to nip banding. The improvement to nip banding may be provided by the use of an organic salt within a roller surface region. The roller may provide, at a nip location, a resistive surface layer having an electrical resistance that avoids the development of nip banding and relatively dark regions on printed media.

Electrophotographic roller with resistance to nip banding

Developer roll having a conductive or semi-conductive soft rubber core and a coating deposited in the soft rubber core wherein the coating has a conductive agent. The outer surface of the soft rubber core is modified before the coating is deposited onto the outer surface of the soft rubber core. Methods for making the same.

Developer rolls having a tuned resistivity

The present disclosure relates to an image forming device component that includes an elastomeric material having a surface and a triboelectric charging material that may be exposed on the elastomeric material surface. The triboelectric material may be exposed by a finishing process that results in removal of a portion of the material leaving voids in the surface. The surface may have a surface roughness in the range of about 0.1 to 5.0 Ra. The component may include a developer roller in an electrophotograhic printer and may provide contact electrification to a given toner during a printing operation.

Image forming apparatus component with triboelectric properties

Rolls having a polyurethane elastomer formed from a polyurethane mixture, wherein the polyurethane mixture comprises polydiene, tri-functional polyol curative, an additional graft polymer curative having a molecular weight of at least about 800 and comprising diol, polyol, diamine, polyamine or a combination thereof, conductive modifier, antioxidant, and hydrolytic stabilizer. Methods of forming such rolls include casting the polyurethane mixture, followed by curing, then demolding, grinding to desired dimensions and baking such that the outer layer of the cured roll is oxidized.

Polyurethane rolls and methods of manufacturing

The present invention relates generally to image forming equipment, e.g. a laser printer of the type which includes a photoconductive (PC) drum and an associated charge roller. The invention is disclosed in exemplary embodiment as a laser printer incorporating a cleaner element with an electrical potential to sufficiently charge contamination particles on the PC drum to electrically repel from a charged surface, such as the charge roller.

Apparatus and method of reducing charge roller contamination

The invention is directed to rolls comprising a polyurethane elastomer formed from a polyurethane mixture comprising, inter alia, at least one graft polyacrylate curative, and processes for manufacturing such rolls. The roll is suitable for employment in image forming devices, for example in electrophotographic print applications.

Polyurethane rolls with graft polyacrylate curatives

Polyurethane elastomers are formed from first and second graft curatives, each graft curative having a molecular weight of at least about 800, wherein the first and second graft curatives are substantially immiscible with one another, and wherein the polyurethane elastomer exhibits a hardness of less than about 40 Shore A according to ASTM D2240-86 and a compression set of less than about 8% according to ASTM D395-89, method B, at a temperature of about 70&#xb0; C. for about 22 hours. Rolls are manufactured using such polyurethane elastomers, particularly rolls that are suitable for use in image forming devices, such as electrophotographic print applications.

Polyurethane elastomers with combination of curatives

A toner layer regulating system for an electrophotographic image forming apparatus includes a toner carrier; a toner regulating member supported in cantilevered fashion against the toner carrier so as to form a toner nip therebetween comprising a flexible metallic substrate having a coating covering at least an area forming the nip; wherein the coating comprises at least a matrix of a base polymer and a plurality of fine particles having a particle size of 0.1 microns to thirty microns; wherein the coating has a thickness of approximately one hundred fifty microns or less; wherein the coating has a surface roughness in the range of 0.15 to 1.5 microns Ra and in the range of 1 to 15 microns Rz. A carrier stratum may be disposed between the coating and the substrate, and the coating may be single layer or have a plurality of layers.

Electrophotographic toner regulating member with polymer coating having surface roughness modified by fine particles

An apparatus for ink-jet printing including an ink-jet print head to jet ink, a coating solid, and a coating holder to support the coating solid, wherein the coating holder transfers a portion of the coating solid onto a medium to form a coating solid layer. The coating holder and coating solid may be combined in a removable cartridge. In addition, the medium may be an intermediate transfer medium, a media support medium, a transfer medium, or media, such as paper. A method for inkjet printing also includes applying a coating solid to a medium to form a layer of the coating solid, in a solid form, having predetermined thickness, and applying ink to the medium. The layer of coating solid may interact with the applied ink to destabilize colorant in the ink.

Apparatus and method for printing using a coating solid

Growing community of inventors

Lexington, KY, United States of America

Bhaskar Gopalanarayanan