Automatic Document Feeder; Original Setting And Size Sensors; Feeding And Separation; Transmission And Ejection - Panasonic DP-8020E Service Manual

6.2.

Automatic Document Feeder

The ADF (Automatic Document Feeder) automatically feeds paper into the unit, one original at a time.
Its main features are:
1. Place originals Face-Up
2. Correct Order Stacking (Collation Mode)
3. Paper Feed Mechanism with Pre Feed Roller
The following is the ADF Mechanical operation description.
6.2.1. Automatic Document Feeder
1. Initialization
The ADF begins its operation with the Eject phase in order to feed and eject any originals stuck inside
the ADF. The ADF Motor starts rotating Feed Roller (2010), Exit 1 Roller (1812) and Ejecting the
Original, after a few seconds the Clutch (2324) reverses the rotation direction raising the Original
Stopper to its standby position.

2. Original Setting and Size Sensors

Place the original(s) face up on the ADF until the leading edge stops against the Original Stopper.
Adjust the Original Front and Rear Guides (1711 & 1714) to center the original on the ADF. The
Original Stopper prevents originals from skewing and multiple feeding. The Photo Sensor (131) for
Original Detection detects the presence of Originals on the ADF when the original(s) actuate NP
Actuator (2008) on the Lower Paper Feed Guide (2002). The two Sensors mounted on the SNS PC
Board (2832) which is installed in the Original Upper and Lower Trays (1712, 1706) are actuated by the
Original Front/Rear Guides, their position determines the original's width and 2 Photo Sensors (131) for
Original Length detect the length of the original.

3. Feeding and Separation

When the Start button is pressed, the Clutch (2324) starts to rotate and uppers the Original Stopper,
causing the Pre Feed Roller (2018) to apply a downwards pressure against the originals. After a few
seconds, the Clutch (2324) reverses the direction of rotation and the Pre Feed Roller is raised upwards
along with the Original Stopper. The upper original is fed to the Paper Feed Roller (2001), and the
Separation Rubber (2024) prevents multiple feeding.

4. Transmission and Ejection

The original is fed into the Feed Roller (2010) and when the original actuates the Photo Sensor (131)
for Read Point and Eject, the Paper Feed Roller (2001) stops rotating. The Photo Sensor (131) for
Read Point and Eject detects the scanning position and the Feed Roller (2010) transports the original
while scanning. The Exit 1 Roller (1812) feeds and ejects the original out of the ADF. If there are
additional originals on the ADF, the next one is fed into the feeder.
5. Final Operation
After ejecting the last original on the ADF, the Clutch reverses the direction of rotation raising the
Original Stopper to its standby position.
Ver. 1.0
304
DP-8020E/8020P/8016P
SEP 2006