Konica Minolta DF-502, Service Manual, Page: 13 / 52

Theory of Operation Ver. 1.0 Apr. 2005 2. Automatic Document Feeder (DF-502)
7
DF-502
Composition/Operation
2.4 Document Separating Mechanism
• The coefficient of friction between the Take-Up Roller and Separation Roller is effectively
used to prevent double feed of paper.
When one sheet of paper is
taken up
Since the friction coefficient on the top side of the paper is equal to that
on the underside of the paper, the Separation Roller is turned by the
Take-up Roller. This feeds the paper forward.
When two or more sheets of
paper are taken up
The friction coefficient between the sheets of paper is smaller than that
between the paper and Separation Roller. This stops the Separation
Roller, allowing only the first sheet of paper to be transported by the
Take-up Roller.
Separation Roller
4688M006AA
Take-Up Roller
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