Christopher L Knapp

US Patent:

59601663, Sep 28, 1999

Filed:

Oct 1, 1993

Appl. No.:

8/131056

Inventors:

John Knox Brown - Lexington KY
Cuong Manh Hoang - Lexington KY
Christopher Lawrence Knapp - Lexington KY
John Neil Wellman - Lexington KY

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G06K 1500

US Classification:

395114

Abstract:

A high speed printing system including a host computer, a printer controller and a print engine. The printing system can operate in a normal mode where a high level page description language is used to convey page information from the host computer to the printer controller. The system further permits rasterization of a page to be printed at the host computer and the downloading of rasterized page data to the printer controller in a form that the data can be directly serialized to the print engine.

US Patent:

60233435, Feb 8, 2000

Filed:

Aug 29, 1997

Appl. No.:

8/921294

Inventors:

Cuong Manh Hoang - Lexington KY
Christopher Lawrence Knapp - Lexington KY

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

B41B 1500
H04N 121

US Classification:

358 116

Abstract:

An improved printer is provided that uses a hard disk drive resident in the printer to temporarily store some of the page data of print jobs received by this printer. Since disk access time is relatively slow as compared to access time of random access memory (RAM), only a minimal amount of pages are initially stored on the hard disk drive while the remaining pages of a print job continue to be stored in RAM, such that the pages on the hard disk drive are interleaved with those stored in RAM. Once the pages are stored on the hard disk drive, some of the areas of RAM where they previously resided are released, which allows the printer to free up some of its RAM. In a preferred embodiment of the present invention, only every fourth page is initially stored on the hard disk drive, which effectively spreads out the effects of the slower disk access time across several pages as they are printed. The page data that is stored on the hard disk drive will be divided into tiled "blocks" of print data, so that the individual blocks can be stored in non-contiguous locations within the printer's main memory system of RAM, and later stored on the hard disk drive. If a page of data is to be stored on the hard disk drive, some "empty" space in RAM large enough to hold all of the blocks of data that are being stored on the hard disk drive for this page is reserved in RAM, so that later the blocks that have been stored on the hard disk drive can be retrieved from that drive and will have an immediate place to go in the printer's RAM, which allows the printer to maintain its overall rated printing speed in more situations.