Ricoh B234 - Page 902

IMAGE TRANSFER AND PAPER SEPARATION
B234/B235/B236/D101/D102/D103 6-140 SM
After the image transfer is
completed, the charge on the
transfer belt holds the paper to the
transfer belt. After separating the
paper from the transfer belt, the
transfer belt is discharged by the
transfer belt drive roller [A].
The transfer power pack [B] inside
the transfer belt unit monitors the
current (I
1 and I2) fed back from
the drive rollers at each end of the
transfer belt to adjust the transfer
current.
The power pack then adjusts “I
t” to
keep the current through the drum (I3)
constant, even if the paper,
environmental conditions, or transfer
belt surface resistance change.
The varistor [C] keeps the voltage at
the cleaning bias roller [D] constant.
To apply a higher current to the
transfer belt without a higher voltage,
the bias brush [E] has been
incorporated near the nip between
drum and belt. This ensures that
enough transfer current is applied for
this machine, which has a higher copy
volume.
B234D980.WMF
B234D503.WMF
[A]
[C]
[D]
[E]
[B]