Vance M Stephens

US Patent:

6655679, Dec 2, 2003

Filed:

Jan 31, 2002

Appl. No.:

10/062996

Inventors:

Peter Boucher - Vancouver WA
Vance M. Stephens - Brush Prairie WA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B65H 306

US Classification:

271119, 271 1009, 271 1012, 271242, 271 901, 271 911, 271 913

Abstract:

Apparatus for advancing media through a hardcopy device includes a cylindrical guide wheel having a first radius mounted on a shaft having an axis transverse to a media feed path axis. A guide surface is spaced apart from the guide wheel and defines a media feed path between the guide wheel and the guide surface. A drive wheel having an extended portion that is concentric with the guide wheel, and which has a greater radius than the first radius is fixed to the shaft. A pinch roller communicates with the media feed path.

US Patent:

6682190, Jan 27, 2004

Filed:

Apr 24, 2002

Appl. No.:

10/132782

Inventors:

Steve O Rasmussen - Vancouver WA
Robert M. Yraceburu - Camas WA
Steven P Downing - Camas WA
Stuart D. Spencer - Vancouver WA
Jason S. Belbey - Vancouver WA
Vance M Stephens - Brush Prairie WA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B41J 201

US Classification:

347104, 347101

Abstract:

In an inkjet printing apparatus an inkjet printhead ejects ink into a print-zone. A drive shaft, located upstream of the printhead, has a longitudinal axis, a first radius over a central length, and a second radius less than the first radius at a first recess and a second recess. Each recess is peripheral to the central length. A plurality of pinch devices stabilize the media against the drive shaft. A first guide and a second guide, spaced from the longitudinal axis, are aligned with and extend into the first recess and second recess.

US Patent:

6733110, May 11, 2004

Filed:

Mar 10, 2003

Appl. No.:

10/384960

Inventors:

David W. Pinkernell - Washougal WA
Steve O. Rasmussen - Vancouver WA
Vance M. Stephens - Brush Prairie WA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B41J 215

US Classification:

347 40, 347155

Abstract:

A printing mechanism comprises a print engine that prints an image on a first side of a photographic print media, a laminator that laminates the first side of said photographic print media having said image printed thereon, and a duplexer that returns said photographic print media to said print engine for printing on a second side of said photographic print media.

US Patent:

6783206, Aug 31, 2004

Filed:

Nov 15, 2002

Appl. No.:

10/295142

Inventors:

Victor Bruhn - Vancouver WA
Vance Stephens - Brush Prairie WA
Jim Beehler - Brush Prairie WA
Robert M. Yraceburu - Camas WA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B41J 2165

US Classification:

347 34, 347104

Abstract:

A vacuum platen assembly for a fluid-ejection device of one embodiment of the invention is disclosed includes a platen that has a number of vacuum holes. Each of at least one of the vacuum holes has sidewalls with anti-clog profiles at least substantially prevent collection of media debris and aerosol on the sidewalls.

US Patent:

6789890, Sep 14, 2004

Filed:

Jun 27, 2002

Appl. No.:

10/183827

Inventors:

Victor H. Bruhn - Vancouver WA
Vance M. Stephens - Brush Prairie WA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B41J 201

US Classification:

347104

Abstract:

A holddown for a hard copy device comprises a member having a surface and plural vacuum zones. Each of the vacuum zones defines a cavity in the surface having at least one port therethrough, and each cavity is defined by a sidewall circumscribing the cavity. At least one of the cavities has sidewall with a first section at a first height relative to the surface and a second section at a second height relative to the surface.

US Patent:

6808259, Oct 26, 2004

Filed:

Jan 31, 2002

Appl. No.:

10/066111

Inventors:

Steve O. Rasmussen - Vancouver WA
Robert M. Yraceburu - Camas WA
Steven P. Downing - Camas WA
Stuart D. Spencer - Vancouver WA
Jason S. Belbey - Vancouver WA
Vance M. Stephens - Brush Prairie WA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B41J 201

US Classification:

347104, 101232, 101477, 400642, 400656, 400645, 4006451, 271188, 399406

Abstract:

In an inkjet printing apparatus an inkjet printhead has a plurality of inkjet nozzles which eject ink onto media located within a print-zone. A drive shaft is located upstream of the printhead and is incrementally rotated to advance the media. The drive shaft has a longitudinal axis, a first radius over a central length and a second radius less than the first radius at a first recess and a second recess, each said recess being peripheral to the central length. A plurality of pinch devices stabilize the media against the drive shaft. A first guide is aligned with the first recess and is spaced from an axis of the drive shaft by a first distance which is less than the first radius. A second guide is aligned with the second recess and is spaced from the axis by a second distance less than the first radius.

US Patent:

7456995, Nov 25, 2008

Filed:

May 30, 2001

Appl. No.:

09/870878

Inventors:

Vance M Stephens - Brush Prairie WA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06K 15/02
G06K 15/00
G06K 9/36
G06K 9/32
H04N 1/00

US Classification:

358 12, 358 112, 358437, 382289, 382293, 382295, 382296, 382298

Abstract:

Techniques for printing an image on a print medium. Information regarding the actual size of the medium, or the actual placement of the medium at a print zone, is used to shift the image to properly align the image on the medium. The image can be shifted digitally, or by movement of the medium relative to the printing element.

US Patent:

RE40775, Jun 23, 2009

Filed:

Oct 23, 2002

Appl. No.:

10/279709

Inventors:

Dan Arquilevich - Portland OR, US
Steve O. Rasmussen - Vancouver WA, US
Vance M. Stephens - Brush Prairie WA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B41J 11/00
B41J 11/42
B41J 11/46

US Classification:

358 18

Abstract:

A difference in feed roller diameter from one printer to another causes a media to advance by a different amount for a given rotation of a drive shaft to which the feed roller is coupled. Such variation in advance distance is a linefeed error. Mean linefeed error is determined and corrected by printing a test plot having several areas. Each area is formed of the same image pattern, but is printed at a different linefeed error adjustment to compensate for mean linefeed error. The different adjustments are prescribed and span a typical compensation range for a given print engine model. The different adjustment factors cause banding to occur in some areas. The user picks one of the test pattern areas which has the highest print quality (i. e. , least or no banding). The linefeed adjustment factor corresponding to such area is used for normal printing.