REV.-A
PRINCIPLES OF OPERATION
2.3.6 Printhead
This section describes printhead operation.
2.3.6.1 Printhead Printing Operation
Dot-wire operation during printing is as follows: when the head-driving coil for a dot wire is energized, the
actuating plate (which is engaged to one end of the dot wire) is attracted to the iron core, and drives the
dot wire toward the platen. The dot wire forcefully pushes both ribbon and paper against the platen to print
a dot in the paper.
When the head-driving coil is de-energized, the actuating plate spring causes the actuating plate to return
to its initial position. After striking the platen, the dot wire also returns to its initial position, partly in response
to the impact energy, and partly as
a
result of the wire-resetting spring. The dot wire then remains engaged
to the actuating plate until it is driven again. Figure 2-62 illustrates the printhead printing operation.
Platen
Dot Wire
Ribbon Mask
Wire Resetting
Spring
Paper
Actuating Plate Spring
Figure 2-62. Printhead Printing Operation
2.3.6.2 Printhead Specifications
Printhead specifications are as follows:
Solenoids
Wire Diameter
Pin Arrangement
Drive Voltage
Coil Resistance
24 solenoids
0.20 mm
12 x 2, staggered
24 VDC ± 10%
19.1 ± 1.0 ohms at 77° F (25° C)
LQ-510
2-55
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