Master Feeding Adjustments - Riso RN SERIES Technical Manual

CHAPTER 13. MASTER MAKING SECTION

MASTER FEEDING ADJUSTMENTS

2. Master Feeding Adjustments
1) Master cut position adjustment
This adjustment sets the master cutting timing (print drum stop position for cutting).
Checks and procedure
(1) Adjust if the tail end of the master mounted on the print drum is either too long or too short.
(2) Run test mode No. 284 to adjust.
Setting range: -100 to +100 (-10.0° to +10.0°)
Setting units: 1 (0.1°)
Default:
Increasing the settings increases the length of each master.
2) Master clamp range adjustment
Adjust the master clamp range when it is mounted.
Checks and procedure
(1) Make a normal and confidential master, and then
check the length of the master protruding from the
Clamp magnet plate.
If the amount protruding is within 2 mm ±2 mm, it is
normal. If it is outside this range, adjust as shown
below.
(2) Run test mode No. 283 and adjust.
Setting range: -100 to +100 (-10.0 mm to +10.0
mm)
Setting units: 1 (0.1 mm)
Default:
Increasing the settings increases the amount of
protrusion.
Note:
The relative positioning of already-made masters wound onto the print drum will change if the
clamp range is adjusted. The master scanning start position must therefore be readjusted, and it
must also be confirmed that the Vertical printing position adjustment is correct.
3) Master making image elongation/
shrinkage adjustment
Adjust the Write pulse motor speed for master making.
Checks and procedure
(1) Run test mode No. 051 Test print (mesh), and
produce an actual print.
Printing is correct if the length of three blocks
horizontally is the same as that for four blocks
vertically. (Check by folding paper and illuminating
from behind.) If it is not correct, adjust as shown
below.
(2) Run test mode No. 287 and adjust.
Setting range: -50 to +50 (-5.0% to +5.0%)
Setting units: 1 (0.1%)
Default:
Increasing the settings elongates the image.
Note:
The vertical printing position must be readjusted after
adjusting the elongation/shrinkage.
0 (±0°)
0 (±0 mm)
0 (±0%)
13 – 20
RN (Version 1.0)
Clamp magnet plate
Master
2 ± 2
m m