2.2Mechanical Operation

2.2.1Printhead Mechanism and Operation (See Figure 2-2.)

The printhead is a spring charged 9-pin driving head using a permanent magnet. It is attached to the carriage, which moves in parallel with the platen. Electrically, this unit is connected to the control circuits through the control board.

Figure 2-2 Arrangement of the head pins

View from the tip of the printhead

(1)The printhead configuration:

The printhead is composed of the following parts:

(a)Wire guide

(b)Spring assembly (Wire, Armature, Spring, Yoke, Spacer)

(c)Magnet assembly (Magnet, core, coil, Yoke)

(d)Printed circuit board

(e)Fin

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Oki 3320, 3321 specifications Mechanical Operation