Ricoh B889 Manual page 23

Fan Fold
Plate Motor (F)
Then the fan fold motor changes direction, and the fan fold rollers
move the paper back.
Fan fold plate motor (F) turns on. This lowers fan fold plate (F).
The plate pushes the paper between the fan fold rollers (R). This
makes the first fold.
Slide 23
The fan fold motor always turns both sets of fan fold rollers. It changes
direction to feed the paper either to the front or to the rear.
Folding - 3/8
23
B889 - Fan Fold Unit
Fan Fold
Plate (F)
Fan Fold
Rollers (R)