Xerox Phaser 6121MFP Service Manual page 97

Phaser 6121MFP Service Manual
ADF Pick Operation
1. The media feed sensor detects media loaded in the document feeder.
2. The document stopper establishes the leading edge position of the document.
The stopper is lowered in the standby state and raised when the document is
taken up and fed in.
3. The document stopper is raised and lowered in synchronism with the raising
and lowering motion of the pick-up roller.
4. The pick-up roller and media feed roller turn to take up and feed the original
properly.
5. The pick-up roller transports the original up to the media feed roller.
6. The ADF Transport Motor drives the pick-up roller and media feed roller
through a gear train.
Double feeding of paper is prevented using coefficient of friction between the feed
roller and separator pad.
Paper Feed Roller
Single sheet feeding The coefficient of friction on the front side of the paper fed
between the media feed roller and separator pad is equal to that on the backside
of the paper. This allows the media feed roller to transport the paper.
Multiple sheet feeding The coefficient of friction between the paper and
separator pad is greater than that between sheets of paper. This ensures that only
the first sheet of paper is transported by the media feed roller.
Separator Pad
Theory of Operation
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