Epson DFX-5000+, Service Manual

Page: 57 / 223

Operating Principles
The CR motor is equipped with an encoder unit which generates pulses. The
encoder belt has equally pitched slits and is mounted under the timing belt. A
photo interrupter (encoder) surrounds the encoder belt and converts the carriage
movement into a pulse train.
Left Head Damper
Holder
Paper Width Sensor
Rear CR Guide Shaft
Front CR Guide Shaft
Carriage
CR Timing Belt
Figure 2-5. Carriage Mechanism
Platen Gap Adjustment Mechanism
Figure 2-6 shows the platen gap adjustment mechanism. The front and rear
carriage guide shafts supporting the carriage have a vertical section. The rotation
PG motor is transmitted to the rear carriage guide shaft through the gears.
Counterclockwise rotation motor expands the platen gap and clockwise
rotation reduces it.
The encoder plate with equally pitched slits is attached coaxially to the motor
axis. When the motor rotates, the PG sensor detects it and outputs the pulses.
Each pulse corresponds to detection of a 0.015 mm resolution (horizontal
distance). The system range is 0 to 0.7 mm.
EPSON Service Manual
2-5