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Appendix C
TECHNICAL SERVICES DEPARTMENT
JM44 SHA/JM54SHA Nip Adjustment Procedure
1. Checking Roller Parallelism:
C
ut two 2”x4” strips of paper or cardstock of the same thickness. Raise the upper roller and
insert the stri
ps of paper between the upper and lower rollers about 2” from each end. Lower
the upper roller until it just contacts one of the strips of paper. There should be resistance
while pulling the paper out from between the roller but it should not turn the roller. Check the
strip of paper on the other end of the roller and it should have the exact same resistance
while sliding it in and out of the roller. If the resistance is less on one side than the other, the
rollers should be adjusted.
2. To make this adjustment, keep the strips of paper in the nip
between the rollers 2” from
each end. The necessary adjustments are made on the left end to avoid altering the
pressure and height sensors on the right end. (The hand wheel and end panels must be
removed to access the following adjustment points. Once the end panels are removed, the
hand wheel can then be reinstalled to complete the procedure.) Lower the upper roller until
it touches the strip on the right side of the machine. There should be resistance while pulling
the strip, but the roller should not turn. Compare the amount of resistance on the left, using
the same effort to pull the left strip of paper.
3. Locate the cross bar that goes across the top of the machine between the cabinets with
a plate on each end that has 4 set screws on each plate and 2 mounting bolts coming from
the inside of the cabinet. On the left side, loosen the four set screws in the plate (accessible
from the outside) and the two mounting bolts (accessible from the inside). Inside the left end
case you will see the two gears that raise and lower the upper roller at the top of the vertical
height adjusting shaft. Slide the bar and plate toward the front of the machine disengaging
the two gears. Adjust the roller height using the vertical height adjusting shaft which turns the
larger (driven) gear. Rotate the shaft in the direction that will raise or lower the left end of
the roller to achieve the same resistance on the left paper strip as the strip on the right side.
When the correct height is achieved, slide the cross bar and plate toward the rear of the
machine to reengage the gears. Do not jam them together with force, but leave enough play
for smooth operation. Tighten the two plate mounting bolts and then turn the four set screws
until they are just snug. Double check the gap between the rollers with the paper strips.
Raise and lower the roller to make sure the hand wheel raises and lowers the roller