Epson Stylus Pro 5000, Service Manual, Page: 58 / 780

Stylus Pro5000 Chapter2 Operating Principles
Rev.A
2-19
[Explaining the operation(Con.)]
Once the transmission gear is engaged with the PG driven gear, PG driven
gear is rotated counterclockwise by the forward rotation of PF motor, and
PG mechanism starts its operation. (See figure 2-20) The figure 2-22 shows
the gear train condition, when the platen gap becomes big(wider).
Up
Down
No gear teeth
Middle Transmission Gear
Figure 2-22. Gear Train Condition when PG is wider(big)
[Explaining the operation]
When the PG driven(clutch) gear starts rotating right direction, each lever
with gear located on both sides of the transmission gear, changes the
condition. Also, as it is shown in the figure2-22, since the some portions of
gear teeth are removed on the surface of the driving gear and on the lever
with gear on the right side, the rotation by the PF motor can not be
transmitted more than necessary. Since the PG driven gear itself is the
clutch gear applied with static friction torque, even the motive power tries to
go to the other areas except for the area of controlling PG(2.1mm) and
small PG(1.2mm), the PG driven gear loses its clutch and can not transmit
the power.