Paper Thickness Detection Pattern; Displacement Of Paper Thickness Detection Pattern - Epson Stylus Pro 4400 Service Manual

EPSON Stylus Pro 4400/4450/4800/4880/4880C

Paper Thickness Detection Pattern

Print Specification
Head speed 240 cps
Pattern height 64 dots
Dot size VSD2 Large
Color Black
Print direction Uni-D
Pattern interval Upper patterns: Equal intervals
Lower patterns: Centered on base position for gap
Others When printing starts from the edge of a media, media is
forwarded 90 mm for roll paper and 50 mm for sheets
before printing.
Relations between numbers in print pattern and paper thickness
Numbers in print pattern 1
Paper thickness (mm) 0.1
1 2 3 4 5 6
Figure 1-22. Paper Thickness Detection Pattern
Product Description
adjustment value, and displaced by an
equal distance left and right. Details are
described in next clause.
2 3 ... ...
0.2 0.3 ... ...
7 8 9 10 11 12 13 14 15 16
A4 width
9.0mm (64dot)
feeding
10mm
Displacement of lower pattern
If the displacement in the gap adjustment value with a change of
0.1mm in paper thickness is assumed to be xx microns, the following
applies.
Figure 1-23. Displacement of Paper Thickness Detection Pattern
Note: AB : Gap adjustment value with paper thickness +0.1mm
15
AC: Current gap adjustment value
1.5 AD: Gap adjustment value with paper thickness -0.1mm
A fixed displacement is assumed with changes in paper thickness.
X = AC – AB = AD – AC
X reference value is 14.40 µm with 240CPS, VSD2.
This adjustment value is saved into NVRAM and can be changed.
Example: If paper thickness is 0.2mm for gap adjustment.
Pattern Displacement of bottom
number pattern relative to top pattern
1
2
3
4
5
6
7
8
Operating Panel
Head
If paper thickness is +0.1mm for
gap adjustment.
Paper thickness for gap
adjustment.
If paper thickness is -0.1mm for
gap adjustment.
A B C D
Pattern Displacement of bottom
number pattern relative to top pattern
+2X 9
+1X 10
±0
11
–1X 12
–2X 13
–3X 14
–4X 15
–5X
Revision C
–6X
–7X
–8X
–9X
–10X
–11X
–12X
78