Epson Stylus Pro 4400 - Automatic Bi-D Adjustment; Rough Adjustment Pattern

EPSON Stylus Pro 4400/4450/4800/4880/4880C Revision C
Operating Principles Printer Mechanism Components 149
AUTOMATIC BI-D ADJUSTMENT
A pattern for adjustment is printed, the pattern is scanned and acceptable
values are calculated from the collected values, and then adjustment is
automatically executed. Two types of patterns are printed during adjustment: a
rough adjustment pattern for detecting the approximate correction position and
a fine adjustment pattern for detecting the exact adjustment position.
Figure 2-56. Bi-D Adjustment Patterns
 Rough Adjustment Pattern
This is a pattern for calculating the approximate correction position before
scanning the fine adjustment pattern to be explained later. This pattern uses
only matte black and is printed in a 51 block adjustment pattern shifted by
1/720 in the main scan direction as a standard for ruled line blocks. Detection
light quantity is also maximized to further increase the paper margin area
where sections have the most overlapping standard line blocks and adjustment
line blocks. The maximized position for this detection light quantity becomes
the set adjustment position for the rough adjustment pattern.
NOTE: About the Diagram
In the explanation above uses color classifications for standard
line blocks and the adjustment line blocks, but actuality this is only
1 color, matte black.
Figure 2-57. Rough Adjustment Pattern_1
Figure 2-58. Rough Adjustment Pattern_2
Rough Adjustment Pattern
Fine
Adjustment
Pattern
1 Pass
2 Pass
Printing direction
Standard Lines
Block Pattern
Adjustment Lines
Block Pattern
Rough
Adjustment
Pattern
Printing direction
Standard Lines Block
Matching Overlap: Medium Overlap: Small
Adjustment Lines Block