Squeegee Pressure Balance Adjustment - Riso RZ3xx Series Technical Manual

2. Squeegee Pressure Balance Adjustment

Checks and adjustment
(1) Create a master using Test chart No.14 and make prints. Check the left and right of the prints to compare
the print density and confirm that the density is even between the two sides.
(2) Also check the squeegee pressure by pushing the drum body by fingers against the pressure roller. The
gap between the drum body and the squeegee roller by the feel of the fingers should be equal throughout
the length of the print drum. The gap should be within the following range, and if not, make an adjustment.
* 0.2mm plus/minus 0.05mm (0.15 to 0.25mm) for A3/Ledger drums.
* 0.3mm plus/minus 0.05mm (0.25 to 0.35mm) for B4/Legal/A4/Letter drums.
< Adjustment in the FRONT >
(3) Remove the print drum from the machine, pull out the ink bottle and remove following components.
- Drum cover
- Drum handle
- Drum handle lever
(4) Loosen the three securing screws (indicated by the arrow marks on the photograph) on the squeegee
side frame-F found through the holes on the drum front frame assembly.
(5) Also from the hole on the drum front frame assembly, using a flat-head screwdriver, rotate the squeegee-
gap cam until correct gap is obtained between the squeegee roller and drum body.
(6) Tighten the three securing screws on the on the squeegee side frame-F to finish the adjustment on the
front side of the print drum.
- the adjusting procedure for the rear side of the print drum continues on the next page -
< FRONT >
Drum front frame assembly
RISO Inc. Technical Communications
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Squeegee gap cam
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CHAPTER 8: PRINT DRUM SECTION
Squeegee gap cam
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