Stacker; Roller Caliper Quick Set Up Guide; Jam Detector - Challenge MEDALIST 820 Instructions And Parts Manual

Roller calipers on the Medallist 870 feature quick set
up calipers. Calipers adjust the space or tension be-
tween rollers to provide the proper grip on the paper
for clean crisp folds. Each time the paper is folded, the
thickness increases. To compensate for this, the cali-
pers on both sides of the machine have strips of paper
inserted. The correct number of paper strips to be
placed into the calipers corresponds to the tail end of
Fold Type #1 Caliper
Letter
"Z"
Half
Double
Parallel

Stacker

The stacker consists of a table, belts, wheels, stacker
springs, and a delivery tray. The stacker accumulates
Lower
Stacker
Knob
Wheels
folded stock for easy removal and stocking. The springs
and stacker wheels keep the delivered sheets from
opening up, interleaving and creating paper jams.
Set up:
1. Set the stacker wheels back from the slitter shaft the
width of the folded sheet plus an additional 1/4".
2. The wheels should be placed towards the center
of the folded piece to stop it in position as it is ejected
from the slitter assembly.
3. Center stacker belts under stacker wheels.
16

Roller Caliper Quick Set Up Guide

#2 Caliper
1 1
1 1
1 2
1 2
Stacker
Springs
(fig. 28)
the sheet which will be the minimum thickness of the
stock passing between the rollers. Use 3/4" wide, cut
strips of the same material being folded. (Torn or folded
strips will give improper settings.) Make sure that the
calipers on both sides of the machine are set up with
exactly the same number of paper strips. The chart
below gives the set ups for calipers and plates for sev-
eral common folds.
#3 Caliper #1 Plate
3 open
3 open
2 open
4 open
4. Position the stacker springs on the slitter shaft tie
bar. They should be positioned towards the outside of
the sheet to hold the edges of the folded piece down,
(fig. 28). The springs may be bent for best operation.
5. Depending on the stock and the type of fold, best
stacking performance may be had by using just the
springs or the stacker wheels only. Fine tune these
adjustments as you run your job.
6. Loosen lower knob to adjust stacker wheels from
side to side.

Jam Detector

As standard equipment, all Medalist folders come
equipped with a delivery area jam detector, (fig. 29).
This device senses jams at the feed table and immedi-
ately stops the folder until the jam is removed and the
machine is restarted. The jam detector is mounted on
the center of the tie bar and looks similar to a third
stacker spring, it may be bent for best operation.
#2 Plate
open
open
closed
open
Jam Detector
(fig. 29)
F.669-D/820-870/Jan 98