Multiple-feed prevention
The product uses a separation roller to prevent multiple sheets of media from entering the product. The
paper separation roller follows the rotational direction of the pickup roller because it does not have its own
driving force.
●
Normal-feed: The separation roller is driven by the pickup roller through a sheet of print media. That is,
the separation roller rotates in the media feed direction.
●
Multiple-feed: The low friction force between the sheets weakens the rotational force from the pickup
roller. The separation roller is limited in its rotational force and it does not rotate with such a weak
driving force from the pickup roller. Since the separation roller does not rotate, the multiple sheets do
not feed into the product.
The following figure illustrates the mechanism of the multiple-feed prevention.
Figure 1-21 Multiple-feed prevention
26 Chapter 1 Theory of operation ENWW
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