Minolta Di 620 Manual page 110

<Paper Take-Up Interval Control>
The Paper Feed Roll and Separator Roll may sometimes fail to separate the subse-
quent sheet of paper properly and the leading edge of that paper may be ahead of
the Feed and Separator Rolls inside the copier. If the paper take-up sequence for
that paper is started in this condition, the distance between the preceding and the
current sheet of paper will be shorter than normal, resulting in a misfeed.
If the time it takes the paper to block (
take-up clutch has been energized is shorter than a predetermined time, the paper
take-up clutch is temporarily deenergized; after a given period of time, it is ener-
gized again to provide a good interval between two paper take-ups. This is called
the paper take-up interval control.
<Double Feed Control>
Even if the Paper Take-Up Roll takes up two sheets of paper at one time, the double
feed control uses the second sheet of paper for the next copy cycle without causing
a paper misfeed. It eliminates a paper misfeed that would otherwise result when
two sheets of paper are taken up at once.
Is the second sheet of paper is stationary blocking the paper take-up sensor when
the trailing edge of the first sheet of paper moves past the vertical transport sensor
(unblocked), the copier determines that it is a double feed condition and provides
double feed control.
If, however, the second sheet of paper has reached the Vertical Transport Roller,
the double feed control is not provided since the paper is fed further into the copier
by the Vertical Transport Roller. This could result in a paper misfeed or the second
sheet of paper being fed through the copier with the first one.
Vertical Transport Sensor 1 Detection Point
1st Drawer Paper Take-Up Sensor Detection Point
Vertical Transport Sensor 2 Detection Point
2nd Drawer Paper Take-Up Sensor Detection Point
) the paper take-up sensor after the paper
L
(Double Feed Paper Leading Edge Position)
Double Feed Control
Not Provided
Provided
Not Provided
Provided
1161M014AA
M-91
Take-up from 1st Drawer
Take-up from 2nd Drawer