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Serial matrix printers use a moving printhead with pins to form single
characters sequentially along the printed line. Unlike serial matrix printers,
the P9212 is a line matrix printer. Line matrix printers divide every printable
line into horizontal dot rows, then print a dot row of the entire line at every
lateral sweep of the shuttle.
During each sweep of the shuttle, hammers are activated to print dots at the
required positions in the dot row. When the shuttle reaches the end of a
sweep, it reverses direction, the paper advances one dot row, and the
hammers print the next row of dots as the shuttle sweeps in the opposite
direction, as shown in Figure B–2.
After a line of characters is printed, the paper advances to the first dot row of
the next print line. This creates a number of blank rows between lines of
characters, depending on the print mode and line spacing you selected.
Row
One
Text
Line
10
*
**
Line Matrix Printing
Direction of Shuttle Movement
Dot
Start
1
2
3
4
5
6
7
8
*
9
* *
11
Number of rows is determined by line spacing.
n
1
2
This row is used only for lowercase descenders.
This row is used for underlining and lowercase descenders.
Figure B–2. Line Matrix Printing
Paper
Feed
Direction
B–3
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