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)

Iron Core

Actuating Spring

Mask Holder (Cutting)

Iron Core

Printhead Drive Coil

Figure 2-4. Printhead Mechanism

Printhead Drive Coil

Ribbon

Ribbon

Platen Assembly

Figure 2-4. Printhead Mechanism

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