A quad roll sheet curl control apparatus uses elastomer first and second
rolls forming first and second nips with third and fourth rolls. The
first and second rolls have compressible surfaces, while the third and
fourth roll surfaces are formed of a substantially uncompressible
material. A pivotable gate member in operating relationship with the
first and second nips directs sheets to either the first or the second
nip whereby the desired decurling orientation is achieved for the sheet
by either the elastomer first roll or the elastomer second roll.
Switching nips and curl to be induced does not require drive reversal as
previous decurler arrangements do. The degree of decurling can be
adjusted with at least one cam in communication with at least one of the
first and second rolls.