Konica Minolta BIZHUB 750 Service Manual page 71

Theory of Operation Ver1.0 Aug.2005
B. Separation mechanism
The separation roller [4] is driven in the direction opposite [2] to the paper conveyance [10] through the torque
limiter [1]. However, it is pressed against the feed roller [8] by the working pressure generated by the pressure [9]
of the spring [3] and the torque of the torque limiter. This working pressure of the feed roller, the separation roller
and the torque limiter becomes a limit torque for the double feed prevention of paper.
When no paper is conveyed or when only one sheet of paper is convey between the separation roller and the
feed roller, the frictional force is greater than the limit torque and the separation roller is driven by the feed roller
to be rotated [5].
When 2 or more sheets of paper are conveyed between the separation roller and the feed roller, the limit torque
is greater than the frictional force of these sheets of paper and the separation roller rotates in the reverse direc-
tion [2] to push back the lower paper [7] in contact with the separation roller in the direction [6] of the tray, thus
separating the paper. And, the separation clutch is provided on the same shaft of the torque limiter, and to
reduce the load of the torque limiter on the paper feed motor (M1), it turns ON only when paper is being fed.
[7]
[1] Torque limiter
[2] Rotation in the direction for separation
[3] Spring
[4] Separation roller
[5] Driven for rotation
[8]
[6] [5]
[4]
[3]
14. PAPER FEED SECTION (trays 1 and 2)
[9] [10]
[2] [1]
[6] To the tray
[7] 2nd sheet of paper
[8] Feed roller
[9] Pressure
[10] Paper conveyance direction
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