Epson 3800 - Stylus Pro Color Inkjet Printer, Service Manual

Page: 49 / 286

EPSON Stylus Pro 3800/3800C/3850 Revision A
OPERATING PRINCIPLES Paper Feed Mechanism 49
2.6.2 Paper Loading Mechanism
ASF (AUTO SHEET FEEDER)
The ASF, whose driving source is an ASF motor, consists of a LD roller, LD roller
shaft, ASF sensor, hopper, and paper anti-slip tab. The cams on both ends of the LD
roller shaft activate the hopper and the paper anti-slip tab. The ASF sensor (photo
interrupter sensor) controls the rotational position of the LD roller shaft by detecting
the light-shielding plate installed on the shaft. Paper loading operation from the ASF is
described below:
1. Start of the paper loading operation
The ASF motor moves to rotate the LD roller shaft.
2. Feeding paper to the paper loading position
2-1. The LD roller shaft rotates to release the lever that presses the paper anti-
slip tab, and the tabs go down.
Figure 2-20. Lowering the Paper Anti-slip Tab
2-2. The LD roller shaft rotates to release the hopper actuating the cam that
presses the hopper, and the hopper moves up by the tension of the spring.
Figure 2-21. Raising the Hopper
3. Picking-up paper
The LD roller shaft rotates to feed a single sheet of paper into the printer with a LD
roller.
Figure 2-22. Picking-up Paper
LD Roller Shaft
ASF Motor
Hopper
Paper Anti-slipTab
Lever
Hopper Actuating Cam
Hopper
Standby Raising
LD Roller
LD Roller
Retard Roller
Hopper
Paper
Separation Pad