Ricoh JP735 Service Manual download pdf (Page 72)

DRUM

C252 3-28 SM

3.9.5 DOCTOR ROLLER GAP ADJUSTMENT

Purpose: To control the ink thickness around the ink roller.

Standard: A 0.07mm gauge passes, but a 0.09mm gauge does not.

Tools: Thickness gauge

CAUTION

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.

NOTE:

1) 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.

2) While the gap gauge is inserted, hold the doctor and ink rollers with

your fingers in order to stop the rollers from rotating.

3) 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.

NOTE: Make sure to repeat the adjustment for both ends of the rollers.

C252R913.WMF

[A]

[B]

[C]

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Ricoh JP735 Service Manual Page 72