Xerox Phaser 6280 Service Manual page 87

Phaser 6280 Color Laser Printer Service Manual
Tray 1 Multiple Sheet Feed Prevention
The sheets loaded in Tray 1 (MPT) are occasionally stuck together at the
edges, which can cause a multiple sheet feed or a jam. Normally, when only
one sheet is fed, both the Feed Roller and Retard Roller rotate to allow the
sheet to pass.
Torque Limiter
Retard Roller
However, when two sheets are fed concurrently, only the Feed Roller rotates.
The Retard Roller is coupled to a friction clutch that prevents the roller from
rotating due to the extra force from feeding two sheets; this process allows the
upper sheet to pass by as the lower sheet is stopped by the friction with the
Retard Roller at rest.
The Retard Roller is pushed toward the Feed Roller by spring pressure, and
controlled by the Torque Limiter (Friction Clutch Retard) with which it is
coupled.
Torque Limiter
Retard Roller
Theory of Operation
Tray 1 (MPT) Feed Roller
Retard Roller
Single Feed
s6280-071
Tray 1 (MPT) Feed Roller
Retard Roller
Multiple Feed
s6280-072
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