Printronix P9012, Руководство по обслуживанию

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2–3 Principles of Operation
Matrix Printing
The Dot Matrix
In order to generate characters from dots, the dots must be arranged properly.
The imaginary grid on which the dots are positioned is referred to as the
matrix.
When in the data processing print mode, for spacing of six lines per inch
there are 12 dot rows from the top of one character line to the top of the next
(Figure 2–1 and Figure 2–2). With spacing of eight lines per inch there are
nine dot rows per character line, for nine lines per inch there are eight dot
rows per character line, and for spacing of ten lines per inch there are seven
dot rows per character line.
Elongated characters can be generated by printing each row twice, except for
the first and last (Figure 2–3).
1 12 COLUMN NO.
0.10
0.00835
FIRST ROW AND
COLUMN OF NEXT
CHARACTER
FIRST ROW AND
COLUMN OF NEXT
CHARACTER LINE
(AT 6 LPI)
0.01389
0.02
LOWEST
DESCENDER
DOT LINE
”
”
”
”
Figure 2–1. Defining the Dot Matrix