Platen Gap Adjustment Mechanism - Epson DFX-8500 Service Manual

DFX-8500

PLATEN GAP ADJUSTMENT MECHANISM

Figure 2-6 shows the platen gap adjustment mechanism. The front and rear carriage guide shafts supporting
the carriage are eccentrically mounted. The rotation of the platen gap motor is transmitted to the rear
carriage guide shaft through the gear train. Counterclockwise rotation of the motor expands the platen gap,
and clockwise rotation reduces it.
The encoder plate has equally spaced slits and turns on the motor axis. When the motor rotates, the platen
gap sensor detects these slits and sends out pulses. Each pulse corresponds to a platen gap change of
0.0025 mm. The platen gap can range from 0.35 to 0.84 mm.
Ribbon Mask Holder
Platen Roller Gear
Platen Gap
Motor
2-6
Platen
Platen Roller Transmission Gear
Platen Gap Sensor
Platen Gap Encoder Plate
Figure 2-6. Platen Gap Adjustment Mechanism
Printhead
Rear Carriage Guide Shaft
CW
CCW