Duplo DB-250, Service Manual

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56
A2 - Nipping Plates Spine Adjustment
One side round and one side square
LL
≠
RL RR
≠
LR
OR OR
You have to adjust the nipping plates.
Push each side of nipping plate to find which side is loosing or too tight. Then
slightly loosen all the nipping plate adjustment screws on each plate. Then use the
nipping plate screws to do the fine adjustment until both sides have the same tension
that can be pushing smoothly. Then use the “MOTOR 2” of “TEST2” to hold the
inner pages to check if both nipping plates can evenly hold the inner pages without
off the centerline as shown below. Having verified the nipping plate position, you
can tighten the nipping plates. Make some books to see if the spine has been
improved on both sides.
Nipping plate adjustment screws
Centerline
Nipping plate adjustment screws