Xerox Corporation

Paul Windsor Morehouse, Jr

Michael D Thompson

Weizhong Zhao

Chu-Heng Liu

John F Knapp

John Stephen Facci

Henry R Till

Rachael L McGrath

Shu Chang

Rasin Moser

John Chinnici

Terry D Seim

Timothy J Fuller

Richard P N Veregin

David H Pan

Michael Jon Levy

Bing R Hsieh

Gary Allen Denton

Thomas Acquaviva

Ian D Morrison

Samuel Kaplan

Vladislav Skorokhod

Jing Zhou

Ajay Kumar

Constance J Thornton

Deepak R Maniar

Ralph A Mosher

Edward Blair Caruthers

William M Prest, Jr

Dusan G Lysy

Michael A Butler

John Gary Shaw

Christine J Tarnawskyj

Raymond W Stover

Thomas C Dombroski

Edward B Caruthers, Jr

Anthony M Wallace

Keith Allan Nau

Jennifer R Wagner

Diane Marie Foley

Stewart W Volkers

Mary L McStravick

Christopher M Pattison

David Antwone Reed

Rodney B Proulx

Anita C VanLaeken

Jackie B Parker

Joseph M Antonio

Hirotsugu Oba

Mary L Mc Stravick

Shigang S Qui

Cory Joseph Winters

Rachael L Mc Grath

Song Feng Mo

John M Simpson, Iii

Maria N V Mc Dougall

Scott W Wolff

Allen T Retzlaff

Mary B Schlitzer

A printer receives print jobs and identifies at least one parameter associated with a print job to select a pressure level for at least one ink reservoir and at least one firing signal waveform for operating a printhead in the printer. The selected pressure and waveform enable optimal image quality for existing conditions identified from the print jobs performed by the printer.

Method and apparatus for controlling jetting performance in an inkjet printer

A device for metering developer material to a predefined developer material bed height on a donor member, including a trim bar being mounted a predefined spacing from the donor member; and a magnetic member positioned adjacent and along the length of the trim bar, the magnetic member coacting with the trim bar to obtain the predefined developer material bed height on the donor member.

Trimming system for stabilizing image quality for high performance magnetic brush development

A method () and apparatus () that detects carrier particles () in an electrophotographic device is disclosed. The apparatus may include an image carrying member (). The image carrying member may have a first side () and have a second side () opposite from the first side. The image carrying member may be configured to operate in a direction of motion (). The image carrying member may also be configured to transport an image on the first side. The apparatus may also include a magnet () coupled to the second side of the image carrying member. The magnet may have a length (). The length of the magnet may be at an angle () of greater than zero and less than 90 degrees to the direction of motion of the image carrying member. The magnet may be configured to attract toner carrier particles transported on the image carrying member. The apparatus may also include a first sensor () coupled in proximity to the first side of the image carrying member and coupled in proximity to the magnet. The first sensor may be configured to sense the toner carrier particles attracted by the magnet. The first sensor may also be configured to output a first signal corresponding to the sensed toner carrier particles.

Apparatus and method for detecting carrier particles in an electrophotographic device

To generate a toner cloud in a development system, a first potential is applied to a donor roll for a first pulse time to project toner from the donor roll toward a photoreceptor; a second potential is applied to the donor roll for a second pulse time to slow the speed at which the toner is projected toward the photoreceptor; a third potential is applied to the donor roll for a third pulse time to hold toner between the donor roll and the photoreceptor; and a fourth potential is applied to the donor roll for a fourth pulse time to urge undeveloped toner to the surface of the donor roll. Voltages may also be applied for selectivity removing toner from a donor roll.

Systems and methods for momentum controlled scavengeless jumping development in electrophotographic marking devices

A development station that improves toner halftone dot development over a wide range of environmental conditions includes a developer housing for retaining semi-conductive carrier particles and toner particles, a first magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the first magnetic roll, a second magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the second magnetic roll, an environmental sensor for generating an environmental condition signal, a variable voltage supply coupled to the first magnetic roll and the second magnetic roll, and a control circuit for adjusting an output level for the variable voltage supply.

Environmental controls for operation of an electrostatographic developer unit having multiple magnetic brush rolls

A developer includes black toner particles and carrier particles, the black toner particles including at least one binder, at least one black colorant and one or more external additives, wherein the toner particles comprise from about 7 to about 15 pph of the developer, and wherein the toner particles exhibit a triboelectric charge of from about &#x2212;25 to about &#x2212;50 &#x3bc;C/g at toner particle concentrations of about 7 to about 15 pph of the developer. The developer is ideally suited for use in a high speed (greater than 100 prints per minute) semiconductive magnetic brush development apparatus. Preferably, the black toner particles include a styrene acrylate binder, and the external additives include from about 1.3 to about 2.1% by weight of the toner particles of a first silica having an average particle size of from about 35 to about 45 nm, from about 0.5 to about 1.0% by weight of the toner particles of a second silica having an average particle size of from about 135 to about 160 nm, and from about 0.2 to about 0.5% by weight of the toner particles of a titania having an average particle size of from about 35 to about 45 nm, with an external additive toner surface area coverage of from about 25 to about 45%.

Black toner and developer

An apparatus for removing charged particles from a surface, the surface being capable of movement, including: a conductive brush in contact with the surface, the conductive brush having a first region thereof having a first polarity and a second region having a second polarity; the conductive brush includes a core and conductive fibers attached thereto, the core being electrically segmented into the first region and the second region.

Dual polarity electrostatic brush cleaner

An apparatus and process for applying an electrical charge to a photoreceptor wherein a bias charge roll member is situated in contact or in close proximity with a surface of a member to be charged such as a photoreceptor. The bias charge roll member is supplied with an electrical bias having a variable voltage waveform onto which a DC bias is superimposed. The amount of DC bias is selected to set the signal voltage such that a minimally acceptable amount of AC corona is created sufficient for uniform photoreceptor charging while avoiding unnecessary excessive positive corona that causes excessive photoreceptor wear.

Bias charge roller with optimally induced AC corona

An apparatus and process for applying an electrical charge to a photoreceptor wherein a bias charge roll member is situated in contact or in close proximity with a surface of member to be charged such as a photoreceptor. The bias charge roll member is supplied with an electrical bias having a rectified AC waveform onto which a DC bias is superimposed after the waveform has been rectified. The result is the ability to raise the voltage potential of the photoreceptor with less pulse voltage and, more particularly, to increase the voltage potential of the photoreceptor along as if only DC voltage were applied far above what is possible in the prior art. Among the advantages of the invention is the ability to minimize photoreceptor wear at higher levels of photoreceptor charge since the DC-offset bias enables the second Paschen threshold to be avoided for higher levels of the photoreceptor charge.

Intermittent DC bias charge roll with DC offset voltage

A system and method of applying a controlled amount of fluid to a moveable image carrying member of an electrographic printing system using a liquid toner before an image is transferred to a substrate. The amount of fluid applied may be controlled by a re-wet roller, located between the toner station and the transfer station, whose distance from the moveable image carrying member is varied along with the rotational speed and direction of the re-wet roller, according to either the roughness and porosity of the substrate or the print quality of the substrate. Alternatively, the fluid may be directly applied just to image areas of the moveable image carrying member to improve print quality.

Image preparation system for transfer to substrates

A method and apparatus for determining the properties of roughness and thickness of a substrate to be processed through a machine, and correspondingly adjusting those machine parameters that are affected and which can be optimized based on varying levels of these substrate properties.

Electrostatic process control based upon both the roughness and the thickness of a substrate

The present invention provides an apparatus for forming a uniform layer of liquid developer which apparatus includes, for example, a coater for depositing liquid developer on a first movable substrate to form a first toner layer; a second movable substrate for contacting the first toner layer on the first substrate to form a uniformly thin second toner layer on the first substrate, wherein the directional movement of the first movable substrate surface is contrary to the directional movement of the second movable substrate surface, and wherein at least one of the first substrate surface and the second substrate surface conforms to an opposing surface; and a photoactive member for receipt and formation of latent image thereon and for receipt of a toner layer for development of the latent image by the toner layer.

Method and apparatus for forming a uniform layer of liquid developer

An imaging system for effecting electrostatic printing of an image, wherein the imaging system includes at least one contact electrostatic printing engine operable in a novel fashion upon a copy substrate, for imaging and development of an electrostatic latent image representative of the image, and subsequently transfers the developed image to the copy substrate. A toner cake delivery apparatus provides a thin, uniform toner cake layer of high solids content to a suitable receiving member for subsequent pressure contact with the surface of a latent image bearing imaging member such that a developed image is created by separating and selectively transferring portions of the toner cake layer in correspondence with the image and non-image regions of the latent image.

Method and apparatus for delivery of high solids content toner cake in a

A method and apparatus for improving the quality of an image that has been developed by a liquid carrier is disclosed. Generally speaking, the invention is a blotter roll which includes an absorbing layer wrapped around a non-permeable rigid core. A vacuum system communicates with the exterior surface of the blotter roll to remove the excess fluid from the blotter roll and transport it out of the printing system.

Function-separated vacuum-assisted blotter for liquid development image

A liquid developer composition including: a resin, a colorant, a liquid carrier vehicle, and a cake inducing agent.

Liquid developers and processes thereof

Growing community of inventors

Webster, NY, United States of America

Paul Windsor Morehouse, Jr