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DFX-8500
Rev. B
2-
4
2.1.1 Printhead Mechanism
The printhead is a charge-type, impact dot printhead. Figure 2-4 shows its operation. The dot wire is attached
to the actuating spring at point A. It is pulled back (left in the figure) by magnetic force when power is applied
and during standby. The magnetic force holds back the actuating spring. When current flows through the coil,
a counter-magnetic field is induced in the coil. Then, the actuating spring ejects the dot wire forward against
the ink ribbon, printing a dot on the paper.
Actuating Spring
Mask Holder (Cutting)
Platen Assembly
Ribbon
Dot Wire
Printhead Drive Coil
Iron Core
GND
+35 VDC
Figure 2-4. Printhead Mechanism