Eastman-kodak Company

Nexpress Solutions, Inc.

Other

Heidelberger Druckmaschinen Ag

Timothy Gilbert Armstrong

Christopher Stephen Garcia

W Charles Kasiske

D Steven Kepner

Matthias Hermann Regelsberger

James R Carey

Thomas K Hilbert

Arthur S Kroll

Jerry Eugene Livadas

Michael E Jacobs

John F Crichton

Scott Thomas Slattery

Frank A Shuster

Donald Steven Hensel

Jason Morgan

Gary Edwin Nichols

Thomas Samuel Albrecht

Daniel Francis Vespone

Cathlyn Y Yu

Patricia D Reuschle

Raymond Rossborough

Francisco Luiz Ziegelmuller

John R Thompson

Richard George Allen

Carl R Bothner

Richard A Weitzel

James C Maher

Clyde M Creveling

Wunan Chang

Michelle Wise

Susan Pike Farnand

Thomas Kurt Hilbert

Michelle Dawn Wise

A method and system for printing documents with one or more embedded security features is provided. Security features are embedded in the document by co-printing magnetic and non-magnetic toner on a receiver before fixation by a fixing station. The combination of magnetic and non-magnetic toners in the image results in image elements that easily show alteration or are undetectable by visual means.

Secure document printing method and system

The invention relates generally to apparatus for electrostatic image development and, in particular, apparatus that implement a magnetic brush with a drum photoconductor. According to an aspect of the invention, a method and apparatus for developing an electrostatic image are provided implementing a drum photoconductor and a magnetic brush contacting the drum photoconductor. The magnetic brush includes a mixture of toner and hard magnetic carriers.

Electrostatic image developing method and apparatus using a drum photoconductor and hard magnetic carriers

A magnetic brush development station includes, a housing forming a reservoir for developer materials. A plurality of augers are located in the housing for mixing developer material. A development roller is mounted within the housing for delivering developer material from the reservoir to a development zone. The development roller includes a core magnet inside a shell, having relative rotation. The core magnet extends less than the entire length of the development roller such that a developer nap on the shell does not extend to the respective ends. A metering skive controls the quantity of developer material delivered from the reservoir. A metering skive is positioned parallel to a longitudinal axis of the development roller at a location upstream in the direction of shell rotation prior to the development zone. A magnetic seal is located in association with the skive at each end to substantially prevent leakage of developer material.

Development station for a reproduction apparatus

A magnetic brush development station with a housing forming a reservoir for developer material has a plurality of augers located in the housing for mixing developer material. A drive for the plurality of augers includes an assembly having a body extending through the development station housing. A plurality of bearings are positioned in the body with a spacer between the plurality of bearings. A rotatable shaft is connected between the plurality of augers and an auger drive member. A seal for the rotatable shaft has a lip formed of a material which is able to stretch sufficiently to maintain sealing contact with the shaft while the shaft is being rotated by the auger drive member.

A magnetic brush development station for a reproduction apparatus. The magnetic brush development station includes a housing forming, at least in part, a reservoir for developer material. The reservoir has a pressure equalization seal. A mechanism is associated with the housing for readily moving the housing relative to the reproduction apparatus. Another mechanism selectively readily replenishes and/or empties at least one component of developer material with respect to the reservoir. A plurality of augers are located in the housing for mixing developer material within the reservoir. A drive for the augers, extending through the housing, has a seal therefor. A development roller, mounted within the housing, delivers developer material from the reservoir to a development zone. The development roller includes a core magnet inside a shell such that the core magnet and the shell having relative rotation. The core magnet extends less than the entire length of the development roller such that the developer nap on the shell does not extend to the end of the development roller. A metering skive, extending the length of the development roller, controls the quantity of developer material delivered from the reservoir portion of the housing to the development zone. The metering skive is positioned parallel to the longitudinal axis of the development roller at a location upstream in the direction of shell rotation prior to the development zone. Further, a magnetic seal is located in association with the skive at each end of the development roller. The magnetic field of the magnetic seal is sufficient to substantially prevent leakage of developer material from the ends of the development roller.

A development station for an electrostatographic reproduction apparatus wherein pigmented marking particles from a particulate material mixture of pigmented marking particles and magnetic carrier particles are utilized to develop latent image charge patterns on a dielectric member. The development station has a housing adapted to be located adjacent to a dielectric member. The housing defines a reservoir for a particulate material mixture, and an opening facing such dielectric member. A mixer for mixing particulate material, a magnetic brush for applying pigmented marking particles from such particulate material mixture to a latent image charge pattern to develop such charge pattern, and a transport for transporting such particulate material from the mixer to the magnetic brush are located within the housing. A device is provided for collecting contaminating airborne particulate material contamination. The contamination collecting device includes an elongated tube, located externally of the housing. The tube defines an opening communicating through the wall of the tube with the interior thereof. Passages are defined by the housing between the magnetic brush and the mixer, communicating with the opening of the tube, and a vacuum is supplied to the interior of the tube to substantially prevent contamination of the reproduction apparatus and its environment.

Contamination control device for an electrostatographic development

A mechanism for cleaning the toning roller of a development station for a reproduction apparatus, the toning roller serving to apply marking particles to a latent image to develop such image. The cleaning mechanism comprises including an elongated polyurethane blade having a lead edge. The elongated polyurethane blade is mounted such that the lead edge contacts such toning roller at an angle to a plane tangent to such toning roller, the angle when measured between the plane and the blade adjacent to the cleaned side of the toning roller being in the range of approximately 10.degree.-30.degree..

Cleaning mechanism for the toning roller of an electro-statographic

Scavenging apparatus for removing substantially all unwanted particles from the image and non-image areas of an electrostatographic imaging member without appreciable adverse effects on the desired image remaining thereon, includes an alternating pole magnetic roller for rotatably creating a fast changing magnetic field, a stationary ac biased shell for enclosing the magnetic roller and for creating a low, but fast changing electrostatic field, and a low vacuum system. This apparatus combines the effects of such magnetic and electrostatic fields with those of the low vacuum system to gently loosen and effectively remove unwanted particles from the imaging member, without resort to relatively strong electrostatic field and vacuum values that are likely to adversely affect the desired loose toner image still on the imaging member.

Scavenging apparatus

Disclosed is apparatus for scavenging charged particles (e.g. triboelectrically carrier particles) from an electrographic recording element. Such apparatus comprises a conductive grid positioned in close proximity to the path of the recording element, and biasing means for electrically biasing the grid so as to attract the charged particles from the recording element yet prevent them from depositing on, and thereby contaminating, the grid.

Biased scavenging grid for electrographic apparatus

An electrographic apparatus, of the type employing a brush-type developer applicator which contacts one side of a flexible electrostatic image-bearing web, has (1) a web feed-path constructed in a predetermined configuration and (2) the applicator predeterminedly positioned relative to the feed-path defining elements, such that the flexible image-bearing web is allowed to move freely toward and away from the developer applicator in response to the varying contours of the applicator.

Self-compensating photoconductor web

Growing community of inventors

Rochester, NY, United States of America

Timothy Gilbert Armstrong