Xerox Corporation

Amy L Stamp

William H Hollenbaugh, Jr

Scott M Silence

Roger N Ciccarelli

Thomas R Pickering

Padam K Angra

Merrilee A Galloway

Susan J Lafica

Samuel Kaplan

Denise R Bayley

Alexander N Klymachyov

K Derek Henderson

Michael J Duggan

Gerardo Leute

John S Walters

Dongming Li

Bernard Grushkin

Samir Kumar

Juan A Morales-Tirado

Dara Nanette Lubin

Timothy L Lincoln

Hui Chang

Edward J Gutman

Robert Bruce Anderson, Jr

Lewis S Smith

John G Ruhland

Dwight J Tshudy

Dennis A Mattison, Jr

Kenneth Derek Henderson

Robin L Sheppard

Timothy J Key

William T Delelys

Richard J Muller

Juan M Tirado

A carrier bead collection assembly in a xerographic printer is disclosed. The carrier bead collection assembly may include a tray defining a cavity for retention of carrier beads, wherein the tray is located below a slot in a media transport surface in the xerographic printer and is removable so that it may be cleaned, and a magnet that is disposed beneath the tray, wherein the magnet attracts carrier beads that reside on the media transport surface such that as a result of the attraction, the carrier beads come to rest in the tray.

Carrier bead collection assembly for a xerographic printer

An apparatus comprised of a charging component, a development component, a transport component, a photoconductive component, and a fusing component, and wherein the development component contains a toner comprising at least one binder in an optional amount of from about 85 to about 99 percent by weight, at least one colorant in an optional amount of from about 0.5 to about 15 percent by weight, and calcium stearate in an optional amount of from about 0.05 to about 2 percent by weight and wherein following triboelectric contact with carrier particles, the toner has a charge Q measured in femtocoulombs per particle diameter D measured in microns (Q/D) of from about &#x2212;0.1 to about &#x2212;1 fC/&#x3bc;m with a variation during development of from about 0 to about 0.25 fC/&#x3bc;m and wherein the distribution is substantially unimodal and possesses a peak width of from about 0.1 fC/&#x3bc;m to about 0.5 fC/&#x3bc;m and the toner possesses a charge to mass M, as measured in grams, ratio (Q/M) of from about &#x2212;25 to about &#x2212;70 &#x3bc;C/gram with variation of Q/M during development of from about 0 to about 15 &#x3bc;C/gram.

Toners and developers

A toner comprised of resin, colorant and calcium stearate.

A toner for particular use in devices utilizing hybrid scavengeless development includes toner particles of at least one binder, at least one colorant, and optionally one or more additives, the toner exhibiting a charge per particle diameter (Q/D) of from &minus;0.1 to &minus;1.0 fC/&mgr;m with a variation during development of from 0 to 0.25 fC/&mgr;m and the distribution is substantially unimodal and possesses a peak width of less than 0.5 fC/&mgr;m, and the toner has a triboelectric charge of from &minus;25 to &minus;70 &mgr;C/g with a variation during development of from 0 to 15 &mgr;C/g following triboelectric contact with carrier particles. Use of a toner with such properties in a hybrid scavengeless development apparatus enables images to be achieved with properties similar to that achieved in offset lithography.

Toner and developer providing offset lithography print quality

A method of forming a toner having controlled properties for use in a developer composition finding particular use in a hybrid scavengeless development scheme includes feeding at least one binder and at least one colorant into a mixing device at a feed ratio, upon exit of the mixture from the mixing device, monitoring one or more properties of the mixture with at least one monitoring device, wherein if the monitoring indicates that the one or more properties being monitored is out of specification, removing the monitored mixture from the method and adjusting the feed ratio by adjusting the feeding of the at least one binder or of the at least one colorant, thereby retaining in-specification mixture in the method. The in-specification toner is ground, optionally together with a portion of one or more external additives, classified, and mixed with one or more external additives to obtain the toner having controlled properties.

Detection of the presence and amount of an external surface additive such as silica upon the surface of a toner is accomplished by treating the external surface additive with a fluorescent material and exposing the toner to ultraviolet light. This permits accurate quality control over the amount of the external surface additive required for the toner. The toner thus includes a binder resin and a colorant, and at least one external surface additive upon the surface of the toner, wherein the at least one external surface additive contains a fluorescent material. The fluorescent material may be a fluorescein dye.

Fluorescent treated external surface additives for toner

A replenisher material of toner particles and carrier particles, wherein a replenisher ratio of the toner particles to the carrier particles in the replenisher is determined as a function of at least one property of the developer and at least one operational property of an apparatus for developing an electrostatic latent image recorded on an image receiving member, and wherein the apparatus includes a housing defining a chamber having a supply of developer comprised of toner particles and carrier particles therein, a donor member spaced from the image receiving member and adapted to transport toner particles of the developer from the chamber to a development zone adjacent the image receiving member, at least one wire positioned in the development zone between the image receiving member and the donor member, a voltage supply for electrically biasing the at least one wire during a developing operation with a current to detach toner particles from the donor member, forming a cloud of toner particles in the development zone, and developing the latent image with toner particles from the cloud, and at least one dispenser for dispensing replenisher comprised of toner particles and carrier particles into the chamber, wherein a replenisher ratio of the toner particles to the carrier particles in the replenisher is determined as a function of at least one property of the developer and at least one operational property of the apparatus. The replenisher ratio is preferably determined as a function of the tribo stability of the developer in a non-replenishment mode of the apparatus and/or as a function of the conductivity of the developer in a non-replenishment mode of the apparatus.

Method of replenishing developer in a hybrid scavengeless development system

A developer of a mixture of carrier particles and toner particles containing at least one binder, at least one colorant, and optionally one or more additives, has a triboelectric value of from 35 to 60 &mgr;C/g, a charge distribution (Q/D) of from &minus;0.5 to &minus;1.0 fC/&mgr;m and the distribution is substantially unimodal and possesses a peak width of less than 0.5 fC/&mgr;m, preferably less than 0.3 fC/&mgr;m, and a conductivity of the developer ranges from 1&times;10,to 10&times;10,mho/cm as measured at 30 V. The carrier particles of the developer preferably have an average particle diameter of 65 to 90 microns and a size distribution wherein 2.0% or less of a total number of carrier particles have a size less than 38 micrometers. The ratio of carrier volume median diameter to toner volume median diameter is about 10:1. The developer finds particular use in devices utilizing hybrid scavengeless development. Use of a developer with such properties in a hybrid scavengeless development apparatus enables images to be achieved with properties similar to that achieved in offset lithography.

A process including: blending carrier particles in a fluidized bed jet mill and continuously separating fine particles formed therein from the resulting blended carrier particles.

Carrier composition and processes thereof

A toner comprised of resin, colorant and a surface additive mixture comprised of two coated silicas, and a coated metal oxide.

Toner and developer compositions

Growing community of inventors

Rochester, NY, United States of America

Amy L Stamp