Ricoh D131 Service Manual page 1503

Details
Bypass Junction Gate
This is the bypass junction gate at its home position.
When FM1 (Z-fold) or FM6 (Gate Fold) is selected, the bypass junction gate raises and
allows paper to pass to folder unit 2.
For fold modes other than FM1, FM6 the bypass junction gate remains at it default position.
Paper passes over the top of the bypass junction gate and into the bypass paper path.
D454/D615 110 SM