HP Enterprise 500 manual 37Multifeed prevention

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 1-37Multifeed prevention

	Cassette pickup
	roller
Cassette	Media
separation	Lifting plate
roller

Separation roller does not rotate

Normal feed Multiple feed

48 Chapter 1 Theory of operation ENWW