Epson Stylus Pro 5000 Service Manual page 46

Stylus Pro 5000
Once the carriage hits the flag, the transmission and PG driver gears
disengage. When the PF motor turns counterclockwise, the transmission
gear meshes with and drives the PG driver gear. Figure 2-21 shows the
gear train when the platen gap is small, before the PG driver gear rotates.
Rear Carriage Guide Shaft
Powder Coated Roller
Driver Gear
(High precision gear)
Figure 2-21. Small Platen Gap
Front Carriage Guide Shaft
PG Driver Gear
Once the transmission gear engages the PG driver gear, the PF motor
drives the PG driver gear. (See Figure 2-20.) Figure 2-22 shows the gear
train when the platen gap is wide.
Middle Transmission Gear
Down
Figure 2-22. Large Platen Gap
When the PG driver (clutch) gear starts turning, the transmission gear
turns, altering the positions of the gears shown in figures 2-21 and 2-22.
Some gears have smooth edges without teeth. If the PG driver gear tries
to drive these gears too far, the PG driver gear slips and disengages. This
keeps the platen gap between 1.2 and 2.1 mm.
Chapter 2 Operating Principles
Up
No gear teeth
2-14