REV.-A
2.2.1 Printhead
P-~,
*
*,.
The printhead is an electromagnetic induction 9-pin serial dot head. Nine dot wires are driven
individually to print a dot pattern on the paper, positioned between the platen and ribbon, by hitting
the ink ribbon against the paper and the platen. Print data expanded on the PEGX board is converted
into dot-image data for one vertical row, and output to the
printhead by the printhead drive circuit. A
character is printed by serially printing the dot patterns for each vertical row in the horizontal direction
as the carriage moves. Figure 2-3 shows the
printhead mechanism
Platen
Dot
Wire
Ribbon
Mask
W~re
Reaettmg
Spring
Stopper
Paper
Actuating Plate Spring
Figure 2-3. Printhead Mechanism
2-4
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