Drum
C274 4-38 SM
Normally the doctor roller gap is not adjusted or changed. It tends to be difficult to
change in the field. If the gap is too narrow, an uneven image may appear on the
prints. If it is too wide, too much ink will be applied to the drum screens, resulting in
ink leakage from the drum.
Wipe off the ink around the ink roller beforehand. (Use SP3-6.)
Remove the drum
Remove the Ink roller unit
1. Make sure that a 0.07 mm gap gauge goes through the gap [A] between the ink and
doctor rollers, and that a 0.09 mm gap gauge does not.
The gap should be checked at both ends of the doctor roller. Insert a gap
gauge at each end of the roller. The gap tends to be larger for the center.
While the gap gauge is inserted, hold the doctor and ink rollers with your
fingers in order to stop the rollers from rotating.
While the gap gauge is inserted, hold the end of the gap gauge.
2. If the gap is out of the standard, loosen the screw [B] and adjust the gap by turning the
cam bushing [C] for the front and for the rear.
Make sure to repeat the adjustment for both ends of the rollers.
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