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ADF feed system
The ADF has built-in duplexing capability for scanning two-sided documents. Pages from the original
document enter the ADF from the ADF input tray. A separation roller and separation pad work together
to separate the top sheet from the stack. The page passes through a set of registration rollers and two
sets of feed rollers that advance the page. A set of delivery rollers delivers the page to the ADF output
bin. A bin-full sensor detects when the ADF output bin is full and stops the feed mechanism until the bin
is emptied.
Read Motor
Feed Motor
Carriage
Motor
Registration sensor
Registration roller
Feed roller
Read sensor
Scanning position
Delivery tray
Exit sensor
Bin full sensor
glass
Optical unit
Separation pad
Delivery roller
ADF input tray
Pickup roller
Cover open sensor
Empty sensor
Separation roller
Figure 4-4 ADF paper path and sensors
32 Chapter 4 Theory of operation ENWW