Xerox Phaser 6180MFP Service Manual page 135

Theory of Operation
Tray 3 Multiple Sheet Feed Prevention
The sheets loaded in Tray 3 are occasionally stuck together along the edges,
which can cause a multiple sheet feed or a jam. The Nudger Roller feeds the
sheets to a position between the Feed Roller and the Retard Roller. Normally,
when only one sheet is fed, both the Feed Roller and Retard Roller rotate to
allow the sheet to pass.
Feed Roller (Takeaway Roller) Single Feed
Feed Roller (Nudger Roller)
Retard Roller (Separator)
Friction Clutch
Retard Roller (Separator)
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Phaser 6180MFP Multifunction Printer Service Manual 2-53