Print Head Mechanism - Casio MD-910 Technical Manual

2-3-3 Print head mechanism

This printer has two print heads arranged at intervals on the left and right, so that the left half and
the right half of the register paper can be printed simultaneously as it is moved from left to right.
One movement causes the upper part of one line to be printed and the next movement causes the
lower part of the line to be printed. Therefore, two print head movements complete printing of one
line. The print heads, however, print the register paper only when they move from left to right.
(1) Printing control
Each print head has four printing so-
lenoids and each solenoid is turned
ON/OFF according to the printing data
and the corresponding printing pins
are activated to form character dots.
This printer, however, does not have
a serial/parallel conversion circuit.
Therefore, ON (L level)/OFF (H level)
signals are directly provided to the
eight data lines for each printing sole-
noid.
Printing timing is controlled by the DP
signal which is detected by the dot
pulse sensor and is treated as a clock
pulse and the RP signal which is de-
tected by the reset pulse sensor and
is treated as a starting point.
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