Chapter 2 Standards And Adjustments; Image Adjustments; 1Image Parallelism Adjustment - Canon iR1018 Series Portable Manual

Chapter 2 Standards and
Adjustments

2.1 Image Adjustments

2.1.1 Image parallelism adjustment
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
1) Create a test chart, load it in the ADF, and make a copy of it.
10mm
(feeding direction)
10mm
2) Compare the lines at the end of the test chart with those on the copy for
parallelism. Measure dimensions A and B at the end of the copy and
adjust the amount of skew (the range shown in the table) to within the
spec.
Standard: A-B within ±1.7 mm
Test Sheet
(feeding direction)
<Adjustment method>
This machine allows parallelism between the leading and trailing edges of
the image to be adjusted by changing the positions where the front and rear
springs of the registration unit are hooked.
There are five types of spring hooking positions. (One step = Approx. 0.6
mm)
Settings Spring positions at
the back of host
machine
1 +1
2 +1
3 0
4 -1
5 -1
MEMO:
Parallelism varies depending on the difference in the spring pressure be-
tween the front and rear springs.
For example, the spring position "0"at the back of the host machine and the
spring position "-1"at the front of the host machine are not shown in this doc-
ument because they are the same as the spring position "+1"at the back of the
host machine and the spring position "0t the front of the host machine respec-
tively.
Test Sheet
10mm
F-2-1
A
Rear side
B
Front side
F-2-2
T-2-1
Spring positions at
the front of host
machine
-1
0
0
0
1
0014-5881
-1
0
+1
1) Check the current hooking positions of the left and right springs of the
registration roller. Change the spring hooking positions in reference to the
table below. (They are adjustable in five steps. One step = Approx. 0.6
mm)
Correction of image A
(The A-side extends.)
Correction of image B
(The B-side extends.)
-If the A-side image (at the front of the host machine) is short (shrunken), re-
duce the setting value.
(feeding direction)
-If the B-side image (at the back of the host machine) is short (shrunken), in-
crease the setting value.
(feeding direction)
-1
0
+1
Rear
Front
F-2-3
T-2-2
Settings Spring Spring positions
positions at at the front of
the back of host machine
host machine
1 +1 -1
2 +1
3 0
4 -1
5 -1
F-2-4
F-2-5
Chapter 2
0
0
0
1
A
B
A
B
3