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This method is utilized to increase the print speed and throughput of a printer operating in near letter quality or NLQ print mode.
English (United States)
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Method for Increasing Speed of NLQ Printing
This method is utilized to increase the print speed and throughput of a printer
operating in near letter quality or NLQ print mode.
NLQ printing is typically used with a 9-wire print head and is implemented by
storing two passes of a NLQ font. Printing is done at a reduced speed to increase
horizontal pel density and at half a dot paper movement between passes to
increase vertical pel density.
The present method enhances the horizontal lines on the first pass at half
speed and enhances the vertical and diagonal lines during the second pass.
Since the second pass does not affect the horizontal characters, a signal is sent
to the printer to do the second pass at a higher speed. By doing the second pass
faster, the burst speed of printing can be increased by 25% and throughput
enhanced due to this increase in speed.
Vertical enhancement can create adjacent horizontal dots, but this is not
usually noticeable. If there is a noticeable problem, the characters which cause
this are identified and a signal is sent to do those specific characters at reduced
speed. This is done even if a mix of the characters were included on the same