Epson Stylus Pro 5000 Service Manual page 48

Stylus Pro5000
[Outline of Paper Gear Train]
Power source is Pump/ASF motor. Also, refer to section 2.1.1.6 Lifter Gear
Train Mechanism for the transmission of motive power. Figure 2-9 shows
important gear train of 5mm down mechanism.
Return Spring
Stopper Lever
Figure 2-9. 5mm Mechanism Gear Train
[Explaining the operation]
Like lifter gear train mechanism explained in the section 2.1.1.6, the motive
power from pump/ASF motor is transmitted to the transmission gear for
driving the lifter. At the moment which the paper is loaded by the rotation of
Paper Load Roller, only One-way Roller moves away from the lifter
transmission gear.
Rev. A
Clutch Gear for
Lifter Transmission Gear
5mm Down
One-way
Roller
Even when One-way Roller release the gear train, since the stopper lever
of clutch gear is stopping rotation of clutch gear forcefully, the clutch gear
does not rotate in reverse completely and only the gear shown in the figure
2-9, whose upper clutch gear is removed, rotates in reverse(left rotation)
by the power of the return spring located inside.
Only the range that this return spring located in the clutch gear rotates in
reverse enables the lifter to go down 5mm. The movement that only this
One-way Roller releases is performed by rotating the paper return
transmission cam with 2-step clutch gear, which is the transmission gear
for rotating the paper load roller.
Cam pushes the pin and
One-way Roller goes up.
Paper Return
Transmission Cam
Figure 2-10. Controlling One-way Roller Up and Down
Chapter2 Operating Principles
Pin for controlling
One-way Roller up and down
2-11