40496501TH Draft Version 34
2.2 Mechanical Operation
2.2.1 Printhead mechanism and operation (See Figure 2-13)
The printhead is a spring charged 18-pin (dual 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.
Figure2-20 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)Armature assembly (Wire, Armature, Spring, Yoke, Spacer)
(c)Magnet assembly (Magnet, core, coil, Yoke)
(d)Printed circuit board
(19/120 inches)
(3/120 inches)
(2/120 inches x4)
(2/120 inches x4)
(1/72 inches +0.005)
(1/72 inches +0.005) x 8
(2/120 inches)
(2/120 inches)
#18 #17
#2 #1
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