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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, 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, and the paper advances one dot row. The hammers print the
next row of dots as the shuttle sweeps in the opposite direction, as shown in
Figure 73, unless unidirectional printing is chosen.
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.
Dot
Row
Character
Line
10
11
12
Figure 73. Line Matrix Printing
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InfoPrint 6500-V User's Manual
Direction of shuttle movement
Start
1
2
3
4
5
6
7
8
9
*
* *
Space
1
2
1 Hammer
Print Span
* Used for lowercase descender only
** Used for underline and lowercase descender
Paper
Advances
Paper
Advances
1 Hammer
Print Span
Paper
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