Paper Left/Right Edge Detection During Printing; Paper Width Detection Timing - Epson Stylus Pro 4400 Service Manual
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EPSON Stylus Pro 4400/4450/4800/4880/4880C
PAPER WIDTH DETECTION
When paper is fed, the paper and platen are scanned and the change points of
the detected reflective light levels (paper present level <=> paper absent level)
are confirmed as the paper edges. The diagrams below show scan/detection
timing.
2nd job
1st job
ASF
Roll Paper
ASF
Borderless Print
Borderless Print
Borderless Print
ON/OFF
OFF
ON
Figure 2-52. Paper Width Detection Timing
Operating Principles
At paper set
At paper feed
At printing complete
Manual insertion
Printer Mechanism Components
PAPER LEFT/RIGHT EDGE DETECTION DURING PRINTING
This is performed during borderless printing. For borderless printing of the
conventional printers, the data have been enlarged so that the data would run
out of the left/right edges by 3mm in printing. This printer detects the paper
edges with every pass, and by making immediate adjustments, the amount
forced out is reduced to 1.1mm from the paper edge and the quantity of
scattered ink is reduced. By executing every pass detection, printing can be
performed while following skew of the paper when the paper has skewed
(within the manufacturer's permitted range for skew), and the amount forced
out is maintained at a fixed level. However, in order to prevent forcing out from
absorption materials used for borderless printing, the printing is performed by
maintaining a fixed quantity for one side.
Absorption Material
Figure 2-53. Paper Left/Right Edge Detection During Printing
Revision C
1.1mm
1.1mm
147
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