Method and apparatus for preventing print overruns by controllin

Details Method and apparatus for preventing print overruns by controllin Method and apparatus for preventing print overruns by controllin

1996-06-24

1998-07-14

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

395103, 395116, 358401, 358409, 358412, G06F 1500, H04N 100, H04N 136

Patent

active

057817073

ABSTRACT:
The printing speed of a page printer is modified relative to rasterization execution time (RET) for display commands that define images to be printed on each page strip of a page. The printer includes a variable frequency clock for producing a plurality of clock frequencies for modifying the printing speed. A processor compares the RET for each page strip with a threshold value. When a complex page strip is found whose RET exceeds the threshold, the variable frequency clock is appropriately controlled to generate a lower frequency clock signal to the print engine. The lower frequency signal causes the print engine to operate at a modified (slower) rate for a sufficient amount of time on any previously queued page strip(s) to provide an extended time frame for allowing the complex page strip to be rasterized. Printing speed is slowed, but rasterization time (clock speed) for the complex page strip is not slowed. Accordingly, display commands in the complex page strip are rasterized within the extended amount of time provided by the reduced print speed, thereby preventing a print overrun.

REFERENCES:
patent: 5129049 (1992-07-01), Cuzzo et al.
patent: 5239313 (1993-08-01), Marko et al.
patent: 5444827 (1995-08-01), Briggs et al.
patent: 5457483 (1995-10-01), Oikawa
patent: 5524186 (1996-06-01), Campbell

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