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Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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This invention relates to a method for enhancing throughput of a 24-wire print head by emulation of 8-bit graphics.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
99% of the total text.
Page 1 of 1
Method for Printing in 8-bit Graphic Mode Utilizing a 24-Wire Print Head
This invention relates to a method for enhancing throughput of a 24-wire print
head by emulation of 8-bit graphics.
8-bit graphics is a graphics mode wherein data is sent to the printer a byte at
a time with each bit of the byte actuating one of eight wires on a print head. This
type graphic mode is used on 9-wire print heads.
For a 24-wire print head to emulate 8-bit graphics and a 9-wire print head, the
top twenty wires of the 24-wire print head which are equal in height to eight wires
of a 9-wire print head are used. This would normally render the bottom four
wires unused; however, they are used by the present method. The entire current
line is printed using the current line data and the top twenty wires.
Simultaneously, the top four dots of the next line are printed using the next line
data and the bottom four wires. Thus, these four dots do not have to be printed
when the next line becomes the current line, and the next line data is shifted up
by four dots. This shifting is done for each line, thus the third line will have eight
dots already printed when it becomes the current line, the fourth line will have
twelve dots printed and so on until the fifth line is completed at which time twenty
dots will be printed and the sixth line will be complete. The net result is that six
lines can be printed in the same time that five lines are printed, thereby
significantly enhancing throughput.