2.1.2.2 Motors
This printer has the following motors:
Carriage motor (step motor)
Paper-feed motor (step motor)
REV.-A
Carriage Motor
The carriage motor is used to move the carriage right and left along the platen. This unit employs a
4-phase, 48-step motor using either 1-2
or 2-2
Phase
excitation.
An
open-loop
system
is
Used
for
control.
Paper-Feed Motor
Paper feed is also driven by a 4-phase 48-step motor operating with 2-2 phase excitation. Each phase
switch causes the paper to advance by advanced 1/2 16“ for each phase switch. The gate array controls
the motor through an open loop.
2.1.2.3
Printhead
Figure 2-9 shows the dot-wire operation.
When the head-driving coil is energizecl, the dot wire is pushed out. The dot wire strikes the ribbon,
causing the ribbon to impact the paper, thereby printing a dot.
Dot
/Ribbon
Platen
‘Core
Figure 2-9.
Printhead
2-7
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