Xerox Corporation

Gerald M Fletcher

Edward L Schlueter, Jr

Joseph C Mammino

John S Berkes

Nancy Y Jia

Donald S Sypula

Kock-Yee Law

Peter John Knausdorf

Ihor W Tarnawskyj

James F Smith

Steven Robert Moore

Palghat Srinivas Ramesh

Robert M Ferguson

Lucille M Sharf

Eric Scott Hamby

Martin A Abkowitz

Christopher Auguste Dirubio

Joannes N M De Jong

Bryan James Roof

Delmer G Parker

Michael D Thompson

Kathleen M McGrane

Frank J Bonsignore

Donald J Robertson

Timothy J Fuller

John F Yanus

Damodar M Pai

Aaron Michael Burry

Peter Paul

Markus Rudolf Silvestri

Robert Michael Lofthus

James Edward Williams

Dennis A Abramsohn

David G Anderson

T Edwin Freeman

Bruce J Parks

Ralph A Mosher

Theodore Lovallo

Charles Anthony Radulski

Christian O Abreu

Antonio DeCrescentis

Paul J Brach

Brendan W Kunzmann

Shy-Shung Hwang

Kim S Buell

Allen W Denham

Gail J Levy

Santokh Singh Badesha

Bruce Earl Thayer

Paul Michael Fromm

Howard A Mizes

Dan A Hays

Roger Gaylord Leighton

Michael F Zona

Eliud Robles Flores

Youti Kuo

Robert Arnold Gross

Martin Krucinski

Rachael L McGrath

Shu Chang

David Keneth Ahl

Elliott A Eklund

Eliud Robles-Flores

Kenneth W Pietrowski

Jerry Floyd Adams

Paul J DeGruchy

Donald S Stanton

Robert M Jacobs

Nancy Beth Goodman

John Thomas Buzzelli

Raymond W Stover

Edward B Caruthers, Jr

Douglas A McKeown

Shyshung S Hwang

Frederick E Knier, Jr

William M Allen

John F O'Brien

Mark Stevens

Narendra S Goel

Christopher A Dirubio

Fei Xiao

Alfred J Claflin

Eugene J Fina

Shawn R Rowan

Robert J Mead

Edwin A Urbanek

Joannes Nm De Jong

Francis C McDowell

Anne-Claire K Markle

Alexander Wende

Johannes N M De Jong

Ramesh S Palghat

Methods and devices for creating an electrostatic force. An electrostatic platen device includes a continuous conductive layer; a first dielectric layer provided on a first surface of the continuous conductive layer; and a second dielectric layer provided on a second surface of the continuous conductive layer opposite to the first surface of the conductive layer. A power source is electrically coupled to the continuous conductive layer to generate an electric tacking field.

Electrostatic platen for conductive pet film printing

Embodiments described herein are directed to a system for reducing electrostatic fields underneath print heads in a direct marking printing system. The system includes: one or more print heads for depositing ink onto a media substrate; a media transport for moving the media substrate along a media path past the one or more print heads; a conductive platen contacting the media transport belt; an electrostatic field reducer that includes an alternating current charge device positioned upstream of the one or more print heads; and one or apertures with electrically isolated biased electrodes separated by an opening that is in registration with the ink deposition areas of the one or more print heads. The media transport includes a media transport belt and, when the media is on the transport belt it has an electrostatic field, which can cause printing defects. The electrostatic field reducer and electrodes reduce the electrostatic field on the surface of the media and thereby reduce printing defects.

Active biased electrodes for reducing electrostatic fields underneath print heads in an electrostatic media transport

Embodiments described herein are directed to a system for reducing electrostatic fields underneath print heads in a direct marking printing system. The system includes: one or more print heads for depositing ink onto a media substrate; a media transport for moving the media substrate along a media path past the one or more print heads; a conductive platen contacting the media transport belt; and an electrostatic field reducer that includes an alternating current corona device positioned upstream of the one or more print heads. The media transport includes a media transport belt and, when the media substrate is on the transport belt it has an electrostatic field, which can cause printing defects. The electrostatic field reducer reduces the electrostatic field on the surface of the media substrate and thereby reduces printing defects.

System and method for reducing electrostatic fields underneath print heads in an electrostatic media transport

A semi-conductive media transport is used with an ink jet printing system. A belt is held flat and slides across a conductive platen, causing electrostatic charges on the belt. The belt is made semi-conductive to prevent charge buildup. The belt has an effective surface resistivity between a lower limit to preclude a buildup of electrostatic charges, and an upper limit to enable electrostatic tacking of the media to the belt. The resistivity limits vary depending upon belt velocity, thickness, material, belt and media dielectric constant, and slot width. A pair of charged nip rollers tacks the media substrate to the belt. An AC corotron is disposed above the belt to establish a net neutral charge state on the media substrate and the belt. Platen slots directly below the ink jet print heads will maintain the net neutral charge state on the media substrate and the belt.

Semi-conductive media transport for electrostatic tacking of media

When tacking print media to a print media transport belt in a printer, a tack module having a pair of nips is employed to control charge migration in across the print media in order to tolerate lead edge curl while ensuring uniform printing. An upstream nip is formed by a first bias transfer roll and a first backup roll, and a downstream nip is formed by a second bias transfer roll and a second backup roll. The respective backup rolls are offset slightly upstream of the respective bias transfer rolls. Charge of opposite polarities is applied to the first backup roll and the second bias transfer roll to facilitate taking of the print media to the print media transport belt.

Media tacking to media transport using a media tacking belt

Embodiments described herein are directed to a system for reducing electrostatic fields underneath print heads in a direct marking printing system. The system includes: one or more print heads for depositing ink onto a media substrate; a media transport for moving the media substrate along a media path past the one or more print heads; a conductive platen contacting the media transport belt; an electrostatic field reducer that includes an alternating current charge device positioned upstream of the one or more print heads; and one or electrically isolated biased electrodes in registration with the ink deposition areas of the one or more print heads. The media transport includes a media transport belt and, when the media is on the transport belt it has an electrostatic field, which can cause printing defects. The electrostatic field reducer and electrodes reduce the electrostatic field on the surface of the media and thereby reduce printing defects.

A system and method for adjusting an electrostatic field in a print zone of an inkjet printer. The printer includes an electrostatic tacking device to hold a sheet of recording media to a transport belt moving through the print zone for imaging with one or more inkjet printheads. A sensor determines the electrostatic field before the print zone and adjusts the electrostatic field with a corotron disposed after the tacking device and before the print zone. Reduction of the electrostatic field in the print zone can reduce imaging errors resulting from electrostatic fields.

System and method for adjusting an electrostatic field in an inkjet printer

A toner image transfer assembly has a tacking assembly, an image transfer assembly, and a media transport assembly. The tacking assembly senses critical properties of media while electrostatically tacking media to a transport device. The tacking assembly forwards data corresponding to the sensed electrical properties to the image transfer assembly so that the image transfer assembly anticipates the electrical properties of an approaching media type.

Apparatus, method and system for feedforward of sheet electrostatic tacking parameters to image transfer subsystem in image transfer apparatus

System and methods may calibrate an AC rms voltage applied to a coronode of a charging device to achieve a predefined operating current at a target value of DC shield voltage. The target value of DC shield voltage may be set to be substantially below an over-voltage condition. System and methods may use a calibration routine that may determine a minimum AC voltage required to achieve the target value of DC shield voltage. Systems and methods may alternatively, or additionally, sense current and adjust the applied voltage to obtain a target current.

Calibration apparatus and method for charging unit of image forming device

The magnitude and polarity of the voltage on the fuser roll surface is controlled by either electronic charge application means or by applying charge control agents to the fuser. For negative toner, the fuser roll voltage must also be negative (and visa versa). This will repel the negative toner at the entrance to the fuser nip, prevent the toner from transferring to the fuser roll at the entrance of the fuser nip and preclude the formation of NVO and consequently prevent MOC.

Charge control for fuser roll to prevent print history related marks on copy

Provided herein is a system for using a cleaning web in an electrostatic printing process to provide a uniform and thin wax layer on the fuser roll and thereby minimize print history effects, reduce triboelectric voltages on the fuser roll and provide uniform and improved release of the toner from the fuser roll. The application of this beneficial thin film to the fuser roll is accomplished by impregnating the cleaning web with a wax material that is substantially the same as the wax material in the toner used in the system. This impregnated wax, therefore, has the same release and triboelectric properties as the wax in the toner and therefore will not attract residual toner but will rather repel it.

System to prevent print history on a fuser roll

A printing system includes first and second marking devices for applying images to print media. A primary fusing device is associated with each of the first and second marking devices for applying a primary fusing treatment to the images applied to print media by the first and second marking devices. A secondary fusing module receives printed media from the first and second marking devices, the secondary fusing module including first and second secondary fusing devices which selectively apply a further fusing treatment to the images applied to the printed media.

Printing system

A printing system includes first and second marking devices for applying images to print media. A first primary fusing device is associated with the first marking device for applying a primary fusing treatment to the images applied to print media by the first marking device. A second primary fusing device is associated with the second marking device for applying a primary fusing treatment to the images applied to print media by the second marking device. At least one secondary fusing device receives printed media from the first and second marking devices. The secondary fusing device selectively applies a further fusing treatment to at least a portion of the images applied to the printed media to increase a uniformity of an appearance characteristic between printed images generated by the first marking device and the second marking device.

Printing system with primary and secondary fusing devices

Disclosed is a method and apparatus for sensing residual toner mass after transfer of a xerographic image, to facilitate the identification and characterization of different types of transfer defects. The technique employed utilizes a nominal residual mass signature, measured at the start of a job, in conjunction with subsequent residual mass signature, where the calculated difference between the nominal and subsequent signatures is used to indicate transfer defects and changes in transfer efficiency.

Method and apparatus for sensing and controlling residual mass on customer images

A glossing subsystem is provided that receives duplexed output media that has been selectively marked on a first side and a second side. The glossing subsystem includes: a first glossing unit that selectively provides a first gloss level to a first side of the duplexed output media; and, a second glossing unit that selectively provides a second gloss level to a second side of the duplexed output media.

Multi-unit glossing subsystem for a printing device

Growing community of inventors

Pittsford, NY, United States of America

Gerald M Fletcher