Matthew T Shepherd

US Patent:

6435641, Aug 20, 2002

Filed:

Aug 30, 2000

Appl. No.:

09/651698

Inventors:

Victor Tung - Vancouver WA
Pierre Joseph Kaiser - Vancouver WA
Matthew A. Shepherd - Vancouver WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 2938

US Classification:

347 16, 347104, 400706

Abstract:

An embodiment of a media movement apparatus is used to detect an edge of a unit of media in a media path in an inkjet printer using an optical sensor. When the inkjet printer is operating in a mode in which units of media are continuously moved into the media path, a mechanical sensor will not reliably allow detection of the leading edge of a unit of media. Determining the location of the leading edge of the unit of media is done to correctly place an image on the unit of the media. After ejecting the previous unit of the media into an output tray, the current unit of the media is moved backward in the media path while measuring the output of an optical sensor. If the edge is detected while moving backward, the current unit of the media is moved to the input side of a print zone. If the edge is not detected and the optical sensor indicates the presence of media, a media jam is indicated. If the edge is not detected and the optical sensor indicates the absence of media, the current unit of the media is moved forward while measuring the output of the optical sensor to detect the edge.

US Patent:

6471426, Oct 29, 2002

Filed:

Jan 5, 2000

Appl. No.:

09/477648

Inventors:

Matthew A Shepherd - Vancouver WA
Junji Yamamoto - San Diego CA
Daniel S Kline - Encinitas CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 1930

US Classification:

400323, 400319, 400336, 400354

Abstract:

A print carriage assembly for an ink jet printer. The print carriage assembly includes a print carriage slidably supported on a printer slider rod, and a sub-carriage that is separate from the printer carriage and slidably supported on the printer slider rod for pushing the printer carriage.

US Patent:

6616260, Sep 9, 2003

Filed:

May 25, 2001

Appl. No.:

09/866040

Inventors:

John M Skene - Lake Oswego OR
Matthew A Shepherd - Vancouver WA
Garrard Hume - Corvallis OR

Assignee:

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

International Classification:

B41J 2175

US Classification:

347 19

Abstract:

A system and method for detecting an error in data received from a memory of a replaceable printer component includes providing a first parity bit associated with a first data item. The first data item and the first parity bit are stored in the memory. The printer includes a plurality of electrically conductive lines. The memory includes a plurality of bits. At least one of the electrically conductive lines is associated with each bit. The first data item and the first parity bit are read from the memory. An electrical test of at least one of the electrically conductive lines is performed. An error in the first data item is identified based on the first parity bit read from the memory and the electrical test.

US Patent:

6692169, Feb 17, 2004

Filed:

Jun 25, 2002

Appl. No.:

10/179129

Inventors:

Matthew A Shepherd - Vancouver WA
Junji Yamamoto - San Diego CA
Daniel S Kline - Encinitas CA

Assignee:

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

International Classification:

B41J 1930

US Classification:

400323, 400354, 4003307, 4003325, 400335, 400352, 400319, 400336, 400353, 347 86, 347104

Abstract:

A print carriage assembly for an ink jet printer. The print carriage assembly includes a print carriage slidably supported on a printer slider rod, and a sub-carriage that is separate from the printer carriage and slidably supported on the printer slider rod for pushing the printer carriage.

US Patent:

6769757, Aug 3, 2004

Filed:

Mar 10, 2003

Appl. No.:

10/384942

Inventors:

John M Skene - Lake Oswego OR
Matthew A Shepherd - Vancouver WA
Garrard Hume - Corvallis OR

Assignee:

Hewlett-Packard Development Company, LP - Houston TX

International Classification:

B41J 2175

US Classification:

347 19

Abstract:

A replaceable printer component having an integral memory for use in a printing system includes a semiconductor die and a plurality of circuits formed on the semiconductor die. Each circuit is associated with and indicates the state of a bit in the memory. The memory stores a plurality of functional bits that must match values expected by the printing system for proper operation of the printing system. The memory stores a plurality of informational bits that are not critical to proper operation of the printing system. A large percentage of the circuits associated with the functional bits are positioned substantially near a center of the semiconductor die.

US Patent:

6789870, Sep 14, 2004

Filed:

May 24, 2002

Appl. No.:

10/154714

Inventors:

Arthur H. Barnes - Battle Ground WA
Matthew A. Shepherd - Vancouver WA

Assignee:

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

International Classification:

B41J 29393

US Classification:

347 19, 347 7, 347 14, 347 23, 347 41, 347 24

Abstract:

A method and system for calibrating a device having a first fluid source that ejects a first drop quantity and a second fluid source that ejects a second drop quantity by, for example, printing a pattern having a first portion and a second portion; obtaining a relationship between the first drop quantity and the second drop quantity from the pattern; and adjusting data used to determine quantities of fluid to eject from the first or second fluid sources based on the relationship between the first and second drop quantities. Other embodiments of the invention are directed to a calibration apparatus and system.

US Patent:

6948790, Sep 27, 2005

Filed:

Jul 10, 2003

Appl. No.:

10/616803

Inventors:

Matthew A. Shepherd - Vancouver WA, US
Jason M. Quintana - Brush Prairie WA, US
Marc Yousey - Portland OR, US
Dawn Beachnau Hood - Portland OR, US

Assignee:

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

International Classification:

B41J029/38
B41B001/00

US Classification:

347 12, 358 12

Abstract:

Systems, methods and devices are provided for non-uniform resolutions in printing. In one embodiment, a printing method includes receiving a print job. The method further includes performing the print job. Performing the print job includes printing non-uniform resolutions per raster in a contiguous block of rasters.

US Patent:

6948797, Sep 27, 2005

Filed:

Jul 10, 2003

Appl. No.:

10/616618

Inventors:

Matthew A. Shepherd - Vancouver WA, US
Marc Yousey - Portland OR, US
Jason M. Quintana - Brush Prairie WA, US
Dawn Beachnau Hood - Portland OR, US

International Classification:

B41J002/145

US Classification:

347 41

Abstract:

Systems, methods and devices are provided for non-uniform passes per raster printing. In one embodiment, a printing method includes receiving a print job. The method further includes performing the print job. Performing the print job includes printing non-uniform passes per raster in a contiguous vertical block of rasters.