Lloyd A Williams

US Patent:

6374075, Apr 16, 2002

Filed:

Apr 28, 2000

Appl. No.:

09/559734

Inventors:

Lawrence R. Benedict - Fairport NY
Joannes N. M. DeJong - Suffern NY
Vittorio R. Castelli - Yorktown Heights NY
Lloyd A. Williams - Mahopac NY
Vincent M. Williams - Palmyra NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

399395, 399394

Abstract:

A copy machine having a high accuracy sheet registration system for precise placement of images on each copy sheet. The copy machine includes sensors with charge coupled devices (CCDs) that detect the sheet positions in two dimensions within the machine, and detect sheet arrival times at various positions with the machine. Using this detected information, the copy machine employs a multi-stage process to bring the sheet into contact with a color image moving on a photoreceptor belt, in synchronism with the position and speed of the image on the belt. The copy machine also monitors its own condition and makes predictions about needed preventive maintenance, to instruct personnel to service the machine before the machine fails.

US Patent:

6400913, Jun 4, 2002

Filed:

Dec 14, 2000

Appl. No.:

09/736986

Inventors:

Joannes N. M. de Jong - Suffem NY
Lloyd A. Williams - Mahopac NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1516

US Classification:

399 66, 318 9, 399 75, 399307

Abstract:

Apparatus and method for controlling picture quality in a transfuse xerographic machine has independent velocity control of image transfer and transfuse belts or rollers when they are disengaged from each other and a common velocity control when they are engaged with each other. The machine can be a monochrome or color copier or printer. Various rollers can be the drive and/or the encoder rollers.

US Patent:

6412907, Jul 2, 2002

Filed:

Jan 24, 2001

Appl. No.:

09/768707

Inventors:

Vittorio Castelli - Yorktown Heights NY
Joannes N. M. deJong - Suffern NY
Lloyd A. Williams - Mahopac NY
Barry Wolf - Yorktown Heights NY
Harold M. Anderson - Rancho Palo Verdes CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

A41J 3407

US Classification:

347 37, 347 19

Abstract:

An apparatus and method are provided for the use of an optical sensor to determine the position of a printing device relative to a piece of paper or a paper-handling surface. The optical sensor reads marks to detect movement and/or direction of movement or spacing of imprints on the paper. Benefits include swath stitching calibration, color to color registration, producing printing device alignment data and generating information for printing device firing signals. The present invention is applicable to a wide field of printing technologies, including, but not limited to, acoustic ink printing, thermal ink jet printing, piezo ink jet printing, ionographic printing and a variety of other printing technologies involving the need for positioning a printing device relative to a piece of paper.

US Patent:

6456309, Sep 24, 2002

Filed:

Jul 26, 2000

Appl. No.:

09/626465

Inventors:

Elias Panides - Whitestone NY
Joannes N. M. deJong - Suffern NY
Lloyd A. Williams - Mahopac NY
Vittorio Castelli - Yorktown Heights NY
Barry M. Wolf - Yorktown Heights NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 2385

US Classification:

347116, 347235

Abstract:

Color electrophotographic printers having latent image positions synchronized with start-of-scan signals. A laser source projects a laser beam onto a multifaceted rotating polygon that sweeps that beam in a scan line across a moving photoreceptor. A start-of-scan detector produces start-of-scan signals when the laser beam is in position to write a scan line. A belt sensor produces belt signals when indicia on the photoreceptor passes a reference position. A controller receives the belt signals and the start-of-scan and then adjusts the photoreceptors rotational velocity such that the belt signals are an integral multiple of the start-of-scan signals. To reduce the impact of drive roller eccentricities on belt signal to start-of-scan signal timing, the perimeters of photoreceptor roller elements are sub-multiples of the photoreceptor length.

US Patent:

6533268, Mar 18, 2003

Filed:

Jul 27, 2001

Appl. No.:

09/916993

Inventors:

Lloyd A. Williams - Mahopac NY
Joannes N. M. deJong - Suffern NY
Matthew Dondiego - West Milford NJ
Michael J. Savino - Tappan NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B65H 702

US Classification:

271228

Abstract:

A sheet registration system, especially for printers, with a lower cost and lower mass-movement system for both sheet deskewing and transverse registration repositioning of the sheets in the same integral system, especially for higher speed printing. Only one main drive motor can drive both of the two spaced apart sheet feeding nips, together with a much lower power, and lower cost, deskewing differential drive system for providing the relative differential angular movement of the two spaced sheet feeding nips to achieve the desired amount of sheet deskewing movement, without interrupting the forward feeding movement of the sheet. Also disclosed are extensive further reductions in the component mass of the lateral translation movement for lateral sheet registration.

US Patent:

6575458, Jun 10, 2003

Filed:

Jul 27, 2001

Appl. No.:

09/916994

Inventors:

Lloyd A. Williams - Mahopac NY
Joannes N. M. deJong - Suffern NY
Matthew Dondiego - West Milford NJ
Michael J. Savino - Tappan NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B65H 702

US Classification:

271228

Abstract:

A sheet registration system, especially for printers, with a lower cost and lower mass system for sheets deskewing, and optionally also compatibly providing transverse registration repositioning of the sheets. Mechanisms are disclosed which need only one main drive motor to drive both of the two spaced apart sheet feeding nips, together with a much lower power, and lower cost, deskewing differential drive system for providing the relative differential angular movement of the two spaced sheet feeding nips to achieve the desired amount of sheet deskewing movement, without interrupting the forward feeding movement of the sheet.

US Patent:

6594460, Jul 15, 2003

Filed:

Sep 10, 2002

Appl. No.:

10/241230

Inventors:

Lloyd A. Williams - Mahopac NY
Vittorio Castelli - Yorktown Heights NY
Joannes N. M. deJong - Hopewell Junction NY
Elias Panides - Whitestone NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

399165, 19881003, 198814, 399162

Abstract:

In a printing system in which a rotatable print image bearing belt is mounted on at least one axial belt roller, and the belt must be maintained in a desired substantially consistent lateral registration to maintain image quality, the lateral misregistration of the belt is sensed and a low and substantially constant lateral positional corrective force is applied to the belt in response to the sensing of the lateral misregistration in one of the two directions axial of the axial belt roller for at least one complete rotation of the rotatable print image bearing belt, the low and substantially constant transverse corrective force having a force level sufficient to provide the desired substantially consistent lateral registration of the print image bearing belt.

US Patent:

6725101, Apr 20, 2004

Filed:

Dec 13, 2000

Appl. No.:

09/736520

Inventors:

Rene E. Sanchez - Berkeley CA
Joannes N. M. de Jong - Suffern NY
Lloyd A. Williams - Mahopac NY
Vincent M. Williams - Palmyra NY
Daniel W. Costanza - Webster NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G05B 1302

US Classification:

700 45, 700261

Abstract:

A non-linear control (NLC) system for controlling performance of a device. The NLC system comprises a controller system and a first feedback compensator connected to the controller. The first feedback compensator compensates for linear error performance of the device; the second feedback compensator compensates for non-linear error performance of the device.