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 5-49 Paper-feeder multiple feed prevention
No-load 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
Normal 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
Multiple-feed 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.
172 Chapter 5 Theory of operation ENWW
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