Xerox Versant 4100 Press Manual page 12

Multiple envelopes are reaching the feed roller at once
If the envelope feeder is feeding more than one envelope at a time, the printer will usually separate
the envelopes and feed one at a time into the printer. However, if the feeder is set up properly, the
feeder should be feeding only one envelope will be fed at a time.
Multifeed
CORRECTIVE ACTION: When the envelope feeder is feeding more than one envelope at a time, it
typically means that the separator needs adjustment.
The separator is a removable friction retard assembly in the center of the feeder that enables the
feeder to "peel off" an envelope from the bottom of the stack when the belts move (see below).
3-2
O‐rings
Xerox Customized Envelope Feeder – Problem Solving Guide