Structure for preventing paper double feeding by using the hybrid retard
In the case of the reverse retard separation structure, the paper that has passed through
the Nip can be returned to its original position, so the separation performance is
excellent. However, the Pick-up Roller Unit has to be up/down on every page, which is
why it is noisy and vulnerable to durability.
The present invention operates in a semi-retard separation structure during normal
operation (normal output), and when a multi-feed is detected, reverse operation is
performed to realize only the advantages of the two structures.
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INC, HP, "HYBRID PAPER SEPARATION STRUCTURE", Technical Disclosure Commons, (September 01, 2020)