Joseph S Guth

US Patent:

6526247, Feb 25, 2003

Filed:

May 15, 2001

Appl. No.:

09/855384

Inventors:

Eric C. Stelter - Pittsford NY
Joseph E. Guth - Holley NY
Matthias H. Regelsberger - Rochester NY
Edward M. Eck - Lima NY

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

G03G 1509

US Classification:

399267, 399276, 399275

Abstract:

The invention relates generally to processes for electrostatic image development, and setpoints that provide uniform image development. In particular, an apparatus and process having a magnetic brush that implements hard carriers and a rotating magnetic core within a shell is disclosed. The process implements one or more of the following optimum setpoints: a range of shell surface speeds that provide uniform toning density, a range of shell surface speeds that prevent toner plate-out, a skive spacing that minimizes sensitivity to variation, a magnetic core speed that minimizes sensitivity to variation, and an imaging member spacing that minimizes sensitivity to variation.

US Patent:

6532350, Mar 11, 2003

Filed:

Sep 29, 2000

Appl. No.:

09/676307

Inventors:

Kenneth P. Friedrich - Honeoye NY
Joseph E. Guth - Holley NY
Wunan Chang - Rochester NY
Eric C. Stelter - Pittsford NY

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

G03G 1500

US Classification:

399 88, 399336

Abstract:

A system and method for increasing the rate at which the printing of images and documents can take place, is provided. The document or image to be reproduced is positioned at an image capture location. To capture the image, the desired image is illuminated by lamps and ultimately transferred onto paper. The illumination device is driven by multiple energy sources that can be synchronized to charge and fire in an alternating manner to drive the illumination device at the desired rate.

US Patent:

6728503, Apr 27, 2004

Filed:

May 15, 2001

Appl. No.:

09/855985

Inventors:

Eric C. Stelter - Pittsford NY
Joseph E. Guth - Holley NY
Matthias H. Regelsberger - Rochester NY
Edward M. Eck - Lima NY
Ulrich Mutze - Bad Ditzenbach, DE

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

G03G 1509

US Classification:

399267, 430122

Abstract:

Apparatus and methods for electrographic image development, wherein the image development process is optimized by setting the average developer bulk flow velocity with reference to the imaging member velocity, for example, where the average developer bulk velocity is about the same as the imaging member velocity, or within preferred ranges, such as between about 40% to about 130% of the imaging member velocity.

US Patent:

6775505, Aug 10, 2004

Filed:

Jan 17, 2003

Appl. No.:

10/346748

Inventors:

Eric C. Stelter - Pittsford NY
Joseph E. Guth - Holley NY
Matthias H. Regelsberger - Rochester NY
Edward M. Eck - Lima NY

Assignee:

NexPress Digital LLC - Rochester NY

International Classification:

G03G 1509

US Classification:

399267, 399276, 399277, 399274

Abstract:

The invention relates generally to processes for electrostatic image development, and setpoints that provide uniform image development. In particular, an apparatus and process having a magnetic brush that implements a rotating magnetic core within a shell is disclosed. The process implements one or more of the following optimum setpoints: a range of shell surface speeds that provide uniform toning density, a range of shell surface speeds that prevent toner plate-out, a skive spacing that minimizes sensitivity to variation, a magnetic core speed that minimizes sensitivity to variation, and an imaging member spacing that minimizes sensitivity to variation.

US Patent:

6873805, Mar 29, 2005

Filed:

Jun 21, 2002

Appl. No.:

10/177736

Inventors:

Eric C. Stelter - Pittsford NY, US
Kenneth P. Friedrich - Honeoye NY, US
Joseph E. Guth - Holley NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G015/00
G03G015/08

US Classification:

399 58, 399 48, 399 49

Abstract:

A method and apparatus for replenishing toner based on the electric current used over time by the exposure subsystem. Toner take-out for each image is estimated by measuring the current used by the exposure system, subtracting the quiescent current, integrating over a page or frame, and multiplying by a predetermined value that indicates the amount of toner required by the image, based on the average current used for the exposure and other process parameters. These calculations are done either in hardware or in software. The replenishment system is used to add the correct amount of toner to the developer station to maintain the toner concentration at an approximately constant aim value.

US Patent:

6885833, Apr 26, 2005

Filed:

Jun 21, 2002

Appl. No.:

10/176956

Inventors:

Eric C. Stelter - Pittsford NY, US
Kenneth P. Friedrich - Honeoye NY, US
Joseph Guth - Holley NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G015/00

US Classification:

399 48, 399 49

Abstract:

A mechanism and process for detecting mottle or banding in a developed electrophotographic image. Within an electrophotographic reproduction apparatus , a photoconductor is used for receiving and developing a latent image. The photoconductor traverses a path that passes a charging station , an exposure station , a toning station , and a transfer station. Either a densitometer for measuring the density of the developed image on the photoconductor, or an electrometer or for detecting the voltage of the image on the photoconductor, detects mottle or banding on the developed image. The densitometer or electrometer or has an aperture small enough to detect mottle or banding with wavelengths perceptible by human eyes. A logic and control unit averages the image density or voltage measurements, calculates the variations of the measurements about the average and the periodicities of the measurements, and if the variations or periodicities indicate mottle or banding is present, changes the operation of one or more stations to reduce mottle or banding.

US Patent:

6946230, Sep 20, 2005

Filed:

Nov 13, 2001

Appl. No.:

10/054514

Inventors:

Eric C. Stelter - Pittsford NY, US
Joseph E. Guth - Holley NY, US
Ulrich Mutze - Bad Ditzenbach, DE

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

G03G009/00

US Classification:

4301104, 4301114, 43011141

Abstract:

Compositions and methods for electrographic image development, wherein the image development process employs a two-component developer that includes toner particles having a radius Rand magnetic carrier particles having a radius R, wherein Ris preferably less than about 5Rand is more preferably less than or equal to about 3R.

US Patent:

6959162, Oct 25, 2005

Filed:

Mar 30, 2004

Appl. No.:

10/812683

Inventors:

Eric C. Stelter - Pittsford NY, US
Joseph E. Guth - Holley NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G015/09

US Classification:

399267, 399 53, 399277, 4301114, 430122

Abstract:

Apparatus and methods for electrographic image development, wherein the image development process is optimized by subjecting the developer to magnetic field maxima, thereby imparting to the developer a velocity component in a direction perpendicular to the process direction, ensuring that the toner particles thus accelerated have sufficient kinetic energy to overcome the binding energy binding the toner particles to the carrier particles in the developer, and to be deposited on a receiver bearing an electrostatic latent image. The optimized image is developed to completion, where development to completion is characterized by a proportionality between the cube of the toner charge to mass ratio and a quantity consisting of the magnitude of the voltage of the toning shell minus the magnitude of the voltage of the toned image.