Muratec MFX-2500 Field Engineering Manual page 390

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6.5.1.6.3 Paper Take-Up Retry Control
To minimize the occurrence of paper misfeed due to a slippery Paper Take-Up Roll, Separa-tor Clutch
BCL is energized a second time if a sheet of paper fails to reach Registration Sensor RSEN within a given
period of time after BCL has first been energized.
The control timing is as follows.
A paper misfeed results if the sheet of paper does not reach the Registration Sensor even after three
paper take-up sequences.
6.5.1.6.4 Paper Separating Mechanism
The paper separating mechanism employs a system with a torque limiter that is fitted to the Separator Roll
shaft and stops the Separator Roll when there is a change in friction between the Feed and Separator
Rolls.
<Normal Feeding>
Feed roll
Paper
Separator roll
Driven or stationary
<Double Feeding>
Feed roll
1st sheet of paper
2nd sheet of paper
Separator roll
Stationary
When only one sheet of paper is fed, the friction coefficient on the
top side of the paper is equal to
that on the underside. Driven by the Feed Roll, the paper drives the
Separator Roll. This causes the paper to be sent to the Vertical
Transport Section.
The friction coefficient varies for different ambient conditions and
types of paper being used, which often causes the Separator Roll to
be stationary.
Since the friction coefficient between the under-side of the second
sheet of paper and Separator Roll is greater than that between the
first and second sheets of paper, the Separator Roll is not driven
and holds the second sheet of paper at the nip, allowing only the
first sheet of paper to be fed to the Vertical Transport Section.
6-36
Large Capacity Cassette