Ricoh D131 Service Manual page 1506

2.3 PAPER FOLDING
2.3.1 FLEX-NIP FOLDING
This machine uses the flex-nip method to fold paper.
In this method of folding a stopper fence
size of the paper and the type of fold to be done. A sheet of paper
stopper and stops. However, the upstream rollers continue to rotate. This causes the paper
to bulge and flex toward the nip of the rotating fold rollers on the left. When the paper
reaches the rotating rollers it feeds into the nip. The rollers catch the paper, pull it into the nip,
and form the fold.
In this machine:
There are three fold stoppers placed at strategic positions in the fold path.
Not all the stoppers are used for folding. Only the stoppers needed for the type of
folding are used.
When two or more sheets are fed together, a fold assist plate
toward the rotating fold rollers. The fold plate is used only when more than one sheet of
paper is fed at a time. Up to three sheets can be fed.
SM
is raised or lowered to the correct height for the
pushes the flexed paper
113
Paper Folding
descends, hits the
D454/D615