Xerox Corporation

Mark A Scheuer

Daniel W MacDonald

Eric Michael Gross

Patricia Joanne Donaldson

Edward W Smith, Jr

John Buranicz

Eric Scott Hamby

Paul A Garsin

Carl B Hurwitch

Robin E Berman

Mark Petrush

Joseph W Ward

Prasad P Padmanabhan

Kip L Jugle

James A Winters

Anthony L Paolini

Yao Rong Wang

Fred F Hubble, Iii

Lingappa K Mestha

William H Hollenbaugh, Jr

John J Ianni

Richard L Forbes, Ii

Joseph A Mastrandrea

Kenneth S Palumbo

Nicholas M Soures

David G Wilcox

Debbie S Wickham

Julia A Kohlmeier

Jeffrey McEwen

Mark Steven Amico

David Mark Kerxhalli

Michael D Borton

Moritz Patrick Wagner

Alan J Werner, Jr

Douglas A Lundy

Cyril G Edmunds

Sohail A Dianat

David Michael Thompson

Meera Sampath

Wayne D Drinkwater

Christian O Abreu

Thomas M Baretsky

Douglas A Kreckel

James W Stevens

Fan Shi

John M Scharr

Ashok V Godambe

Charles P Coleman

Steven Robert LeRoy

Anne Fitzpatrick

Steven L Aurand

Irwin Wagman

Wenjin Zhou

Dawn Marie Kelsch

Wayne A Morganti

Peter J McGuire

G Peter Floridio

Rod Stair

Anthony J Paolini

Clement J Nagley

Dale E Seeley

According to embodiments illustrated herein, there is provided a black toner having a resin, an optional additive, and at least two or more colored pigments, and the at least two or more colored pigments are selected from the group consisting of a blue pigment, a green pigment, a red pigment, a magenta pigment, a cyan pigment, a yellow pigment, a white pigment, and mixtures thereof, and the black toner has a colorimetric value L* of about less than 30.

Methods for making customized black toners

A kit used in TC measurement in the field includes a sandwich of 3 screens used for filtration of carrier beads from toner particles within a container. An upper 400 mesh screen has die-cut holes around its edges to allow removal of any beads trapped between the upper screen and a middle 500 mesh screen. A bottom screen of coarse 20 mesh material is used for strength to support the other screens. When a vacuum source connected to a bottom portion of the container is turned ON, the carrier beads approach the screens in the center of the container. The recirculating airflow carries the carrier beads away from the upper screen at the edges. Thus, with the upper screen being die-cut with openings around its edges, these openings allow the trapped beads to return to the inner chamber of the container for removal during cleaning.

Screen configuration for use in a toner concentration field measurement tool

A method of changing a color developer in a developer housing of xerographic marking system are disclosed, and may include supplying a chart divided into a plurality of color family sections or quadrants, selecting a new color to be installed in a developer housing corresponding to the color family section, purging old toner from the developer housing until a concentration of old toner is reduced to about 0.1% to 6.0% from its nominal concentration, installing a container of a new color developer in the developer housing, and running the marking system until the required concentration of the new color developer is attained.

Method by which an infinite number of colors may be used with a finite number of CCUs

According to embodiments illustrated herein, there is provided a black toner having a resin, an optional additive, and at least two or more colored pigments, and the at least two or more colored pigments are selected from the group consisting of a blue pigment, a green pigment, a red pigment, a magenta pigment, a cyan pigment, a yellow pigment, a white pigment, and mixtures thereof, and the black toner has a calorimetric value L* of about less than 30.

A tool used in the TC measurement in the field includes a venturi shaped container that when connected to vacuum pressure from a portable vacuum cleaner takes advantage of cyclone separator functionality to assist in separation of fine toner from carrier beads with the toner being caught in the vacuum cleaner and the carrier beads being caught by a plurality of screens covering an opening in the bottom of the container.

Toner concentration field measurement tool

A method and system for a color xerographic machine determines a lower bound for the ROS power levels so that color defects are not produced by light attenuation from one or more layers of toner particles on a latent image. The method computes a minimum ROS power level for the photoreceptor at its maximum and minimum charge levels. The minimum ROS power level is the level at which the discharge voltage does not drop beyond a maximum discharge voltage difference. The difference is related to a toner particle density that affects color reproduction. The minimum ROS power levels for the minimum and maximum photoreceptor charge levels are used to compute a functional relationship for minimum ROS power levels at other photoreceptor charge levels. Thereafter, the minimum ROS power level function may be used to compute minimum ROS power levels for other photoreceptor charge levels. The computed minimum ROS power levels may be used to control the power levels used during color reproduction performed by the machine.

System and method for controlling the lower power bound for a raster output scanner in a color xerographic printer

A system and method for determining a color separation registration error in a multi-color printing system are provided. The system and method provide for instructing first and second color separations to mark a substrate with first and second fine-periodic-patch images to determine color separation registration error(s). The system and method further provide for determining whether at least an about half-period color separation registration error exists between the first and second color separations.

System and method for determining and correcting color separation registration errors in a multi-color printing system

An enhanced toner area coverage (ETAC) sensor may be calibrated to adjust for changes in LED intensity by determining a functional relationship between specular developed mass per unit area (DMA) values and diffuse readings obtained from the sensor. Specular and diffuse readings are obtained from an ETAC sensor that senses reflected light from toner patches generated with incrementally increasing densities on the photoreceptor belt. The specular readings in a particular range and their corresponding diffuse readings are selected for the calibration computations. Reflected ratios are computed from the specular readings and used to determine specular DMAs. The specular DMAs and selected diffuse readings define a set of points for which a functional relationship is determined.

Method and system for calibrating a reflection infrared densitometer in a digital image reproduction machine

A method for maintaining developer material within in a predefined state through the scheduling of increased toner throughput coordinated among multiple developer housings. The method monitors developer material health at each developer station within a plurality of developer stations to detect unhealthy developer material. If unhealthy developer material is detected in at least one of developer stations, a toner purge state is identified for each of the remaining developer stations. Based on the toner purge states, a toner purge is performed.

Method for controlling the state of developer material

A method for operating a printing machine to maintain developer material within in a predefined state by monitoring the state of materials in a developer and automatically scheduling corrective action before print quality becomes significantly impacted. The corrective action can include forcing an increase in toner usage by periodically generating and developing images having high toner density.

Material state management via automatic toner purge

An impending fault of a component operated within a closed-loop control system can be detected. The close-loop control system is disabled. An actuator of the closed-loop control system is operated at one or more test values. A sensor reading of the actuator is taken while that actuator is operated at the one or more test values. A warning is generated if an impending fault condition is detected. An impending fault condition may be detected if the component operates at a value exceeding a maximum defined operating value, if the component operates at a value below a minimum defined operating value, or if an operating range that is narrower than a defined full operating range for the component is detected.

Systems and methods for detecting impending faults within closed-loop control systems

Systems and methods for measuring and setting grid voltages in an image forming device may include setting a first charging device of a first image forming station to a first voltage level and setting a second charging device of the first image forming station to be off; charging a charge-retentive surface with the first charging device set at the first voltage level; measuring and the charge imparted to the charge-retentive surface by the first charging device; storing the measured charge value. Systems and methods may further include repeating the setting, charging, measuring and storing steps for the first charging device for at least one additional voltage level; and determining at least one parameter of the first charging device based on the stored measured charge values for the first charging device for each voltage level.

Systems and methods for in situ setting charge voltages in a dual recharge system

An actual tone reproduction curve of an electrophotographic system is controlled at several points to coincide with a target tone reproduction curve. The several points are referred to as level 2 control points. The level 2 control points are dynamically selected to, for example, minimize an aspect of error between the actual tone reproduction curve and the target tone reproduction curve. Test patches are generated in association with target test patch densities. Actual test patch densities are measured. An approximation of the actual tone reproduction curve is fit to the measured data. New level 2 control points are selected to minimize an aspect of deviation or error between the actual tone reproduction curve and the target tone reproduction curve. A system operative to dynamically select the level 2 control points includes means for selecting optimum level 2 control points.

Dynamic control patches for better TRC control

A method for determining a sensor field of view with respect to a test patch and aligning the test patch with the sensor field of view. The apparatus and method according to this invention additionally allows for utilizing the results of the determined field of view to aid in controlling the various system parameters of the image printing system.

Detecting the location of a sensors field of view

Method and apparatus for controlling amplifier gain, e.g., as used in ESV of a xerographic copier, has a light source, e.g., an LED, optically coupled to a gain control light dependent resistor (LDR). The LDR can be in a negative feedback loop around an amplifier. There is a voltage sensing probe located near the photoreceptor belt of the copier and coupled to an input of the amplifier.

Automatic gain control for electrostatic voltmeters

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Williamson, NY, United States of America

Mark A Scheuer