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2. PTS Sensor (Print Timing Signal Sensor)
The PTS sensor consists of the PTS sensor board assembly and the sensor board on the timing belt motor shaft.
The signal is Low when the slit of the sensor board appears. (lt is an open collector output.)
3. Paper Sensor
The paper sensor consists of the reed switch attached to paper sensor board and the permanent magnet attached
to the paper sensor lever. The permanent magnet approaches the reed switch and the signal passes when there is
no paper.
4. Sensor Circuit
To+5V
HP signal
Reed switch
~
Paper sensor
o------o~
~
PTS signal
~Permanent
magnet
ToGND
• Printing Mechanism
The main elements of the printing mechanism are print head unit, carriage, timing belt, timing belt motor and
platen. The print head unit on the carriage is moved to the right and left by the timing belt on shafts A and B of the
carriage guide. The timing belt is driven by the timing belt motor through the belt driving pulley and belt driving
pulley.
Printing performs when the dot wire springs out toward the platen due to the flow of c1,.1rrent in the head driving
coil. The current flows when the PTS signal is generated by the belt motor rotation.
~--------------------~$
Carriage drive signal
HP signal
~--------------2~.5~4~m-m~(-1/-10_"_)--------------~$f
H d
d
.
f
-
ea
nve coi I signal
~
C
0.4ms
---=-----
PTS signal
Dot wire tip
--~~-
1. Principle of Carriage Movement
The carriage is moved to the right and left by the drive of the timing belt motor with the timing belt inserted in
the
carriage.
Carriage
Junction
Right
Timing belt
-21-
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