Baum 2020 Instruction Manual page 44

On a buckle folder, the sheet is laid flat on a register table and then enters the fold pan assembly
where it comes to a stop against the stationary fold plate stop. A series of buckles then forms throughout
the sheet. The buckles whithin the fold pan are kept very small by the narrow channel design. The
buckles at the end of the fold pan, however, will be larger. The fold pans and fold rollers are configured
such that the large buckle will always form downward, where it can be grabbed by the fold rollers and
compressed into a fold.
Look at the figure below. You can see that fold pans #1 and #3 are angled upwards. Because of this
and the configuration of the fold rollers, sheets fed into the #1 and #3 fold pans will always be folded up
(i.e. so that the “up” surface of the sheet is folded into contact with itself).
Likewise, because foldpans #2 and #4 are angled down, sheets fed into them will be down-folds; the
“down” surface of the sheet will be folded into contact with itself.
SHEET
STOP
TP10243-1
DEFLECTOR
CLOSED
4
5
DEFLECTOR
CLOSED
Fold Pan
#1
#2
#3
#4
PAGE 44
DEFLECTOR
OPEN
1
MAIN
2
DRIVE
3
SHEET
STOP
Fold
UP
DOWN
UP
DOWN
DEFLECTOR
OPEN