HP (Hewlett-Packard) CF081A#BGJ Benutzerhandbuch

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.

  Multifeed prevention

Cassette pickup
roller

Media

Lifting plate

Cassette 
separation
roller

Normal feed

Multiple feed

Separation roller does not rotate

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Chapter 1   Theory of operation

ENWW