Epson 3800 Service Manual - Page 49

EPSON Stylus Pro 3800/3800C/3850 Revision A 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 antislip tab, and the tabs go down. Hopper ASF Motor 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. Hopper Hopper Actuating Cam LD Roller Standby Raising 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. Paper Hopper LD Roller Paper Anti-slipTab Lever LD Roller Shaft Figure 2-20. Lowering the Paper Anti-slip Tab Separation Pad Retard Roller Figure 2-22. Picking-up Paper OPERATING PRINCIPLES Paper Feed Mechanism 49