Cassette paper-presence detection
The cassette media-presence sensor detects whether paper is in the cassette.
Figure 5-34 Paper-level-detection mechanism
Multifeed prevention
In the cassette, a separation roller prevents multiple sheets of paper from entering the paper path. The
cassette pickup roller drives the separation roller through a sheet of paper.
The low friction force between the sheets weakens the driving force from the cassette pickup roller.
Because some braking force is applied to the cassette separation roller, the weak rotational force of the
pickup roller is not enough to rotate the separation roller. Therefore, the separation roller holds back
any multiple-fed sheets, and one sheet of media is fed into the printer.
Figure 5-35 Multifeed prevention
Cassette pickup
roller
Media
Lifting plate
Cassette
separation
roller
Normal feed
Multiple feed
Separation roller does not rotate
ENWW Pickup, feed, and delivery system 155
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