Star Micronics LC-8521, Technical Manual

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4. Mechanism
4-1. Print Head Mechanism
4-1-1. Character Mechanism
The wiring arrangement of the guide section on the print head styles is depicted in Fig. 2-4. Odd- and even-numbered wires
are arranged it two columns. This is a result of the necessity for laying adjacent dots on top of one another.
Fig. 2-4 Wiring Arrangement
4-1-2. Print Wire Drive Operation
The print head consists of 24 needle wires and 24 print solenoids. The following explains how each needle wire
operates during printing.
(1)
When the print solenoid is energized, the clapper is attracted by the iron core and the needle wire is driven toward
the platen.
(2) This needle wire hits the platen via the ink ribbon and paper. A single dot is printed on the paper.
(3) When the print solenoid is de-energized, the needle wire is returned to its original position by rebound energy and
spring and clapper holder (leaf spring) force.
Fig. 2-5 Outline of Print Head Mechanism