HP Enterprise 500 manual 51Paper-feeder multiple feed prevention

Paper-feeder multiple feed prevention

The paper-feeder uses a separation roller to prevent multiple sheets of paper from entering the printer. The separation roller prevents multiple feeds of paper by allowing the paper-feeder separation roller to rotate in the same direction as the paper-feeder feed roller 1. The paper-feeder separation roller is equipped with the torque limiter. If multiple sheets of paper are picked up, the torque limiter takes control of the paper-feeder separation roller, and pushes the extra sheets back to the paper-feeder cassette. That way, only the top sheet is fed to the printer.

Figure 1-51Paper-feeder multiple feed prevention

No-load

Normal feed

Multiple-feed

Rotational force for paper-feeder separation roller: Pushes back the media into the paper-feeder cassette

Rotational force for paper-feeder feed roller 1: Feeds media into the printer

Rotational force for paper-feeder separation roller: Pushes back the media into the paper-feeder cassette

Rotational force for paper-feeder feed roller 1: Feeds media into the printer

The low friction force between the sheets weakens the rotational force from the paper-feeder feed roller 1.

The paper-feeder separation roller rotates by its own rotational force and removes the extra sheet.

ENWW Optional paper feeder 67