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4.2.2
Space Mechanism and Operation
Spacing and carriage return are performed by driving the
carriage, which is guided by two guide shafts mounted parallel
to the platen, by a pulse motor.
The space mechanism is composed of the following.
la) Pulse motor with synchro belt pulley
(b) Synchro belt
(c) Two guide shafts
(d)
Carriage
le) Home sensor
(f) Home sensor plate
(1)
Spacing operation (See Fig. 4-2.)
The carriage with the print head mounted on it moves
parallel to the platen along the upper and lower guide
shafts, and one end of the carriage frame is fixed to the
synchro belt.
As the pulse motor turns clockwise, the carriage assembly
is driven from left to right.
The spacing mechanism is so designed that, when the pulse
motor turns 2 steps (15
0 ) ,
the carriage moves 2.54 rom
(1/10 inch).
(2)
Carriage return operation
When the carriage return (CR) code is received, the pulse
motor is driven counterclockwise by the signal from the
control circuit.
The carriage moves from right to left
until the home sensor plate enters the opening in the home
sensor.
The home sensor consists of a LED photodiode pair.
When
the home sensor plate enters the sensor, the light is
interrupted and a signal is generated to stop the motor.
When the pulse motor stops, the carriage stays at the
start position until the next print line is ready to be
printed.
35
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