Dell 3130cn - Color Laser Printer, Service Manual

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Chapter 6 Principles of Operation
Version 3 2008.05.30
3.1.3 Multiple Sheet Feed Prevention
The sheets set in a tray or cassette are occasionally stuck together along the edges. The stuck
sheets cause a multiple sheet feed or a jam. The sheets are fed by the Nudger Roll to a position
between the Feed Roll and the Separator Roll. Normally, when only one sheet is fed, both the Feed
Roll and Separator Roll rotate to allow the sheet to pass. However, when two sheets are fed
concurrently, only the Feed Roll rotates and the Separator Roll is locked thereby allowing the upper
sheet to pass by being separated from the lower sheet that is stopped by the friction with the
Separator Roll at rest.
The Separator Roll is being pushed toward the Feed Roll by spring pressure, and controlled by the
torque limiter (Clutch Assy Friction) with which it is coupled.
3.1.4 Reference diagram