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A 24-wire matrix printer has a single draft font to print drafts in four pitches, namely, 10, 12, 15, and 17.1.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
53% of the total text.
Page 1 of 2
24-Wire Matrix Printer Using a Single Draft 10-pitch Font For Draft Modes in
a Plurality of Pitches
A 24-wire matrix printer has a single draft font to print drafts in four pitches,
namely, 10, 12, 15, and 17.1.
A 24-wire printhead of a matrix printer is designed to operate at one natural
frequency (or its harmonics) so that each print wire reaches its maximum speed.
The printhead must be operated at the same frequency to obtain a constant
impact force of the print wire-to-platen which is important to print quality.
This operation of the printhead at one natural frequency defines horizontal
resolution of the font of each print mode. For example, in the letter quality mode,
the print speed is 9 inches per second (ips) and the horizontal resolution is 360
dots per inch (dpi) with a restriction of no two consecutive pels being "on." When
operating in a draft mode at a print speed of 27 ips, the horizontal resolution must
be 120 dpi with the same restriction of no two consecutive pels being "on."
This restriction of no two consecutive pels being "on" significantly reduces the
number of vertical columns available for use to design graphic characters. For
1/120 inch resolution vertical columns, the table shows there would be only three
vertical columns effectively available for 17.1 pitch and four vertical columns
effectively available for 15 pitch since consecutive pels can not be "on." Neither
is enough to design a graphic character. Accordingly, by having the horizontal
resolution at 180 dpi, the table shows five effective vertical columns are provided
for 17.1 pitch. Print...