Ricoh D131 Service Manual page 1480

Front and Rear
The terms "Front" and "Rear" are critical to understanding how paper is skewing during
folding. These terms are defined relative to the positioning of the paper in the paper path as
it feeds and exits.
"High" means the distance from the nip of the fold roller to the stopper is too far on one
end of the fence.
"Low" means the distance from the nip of the fold roller to the stopper is too short.
Two examples are shown below.
Example 1: High (Stopper Too Far From The Nip)
The black arrow shows the direction of paper feed from right to left. When the skew sheet is
opened the Front edge is longer than the Rear edge.
SM 87
Skew Adjustment
D454/D615