Paper Width Determination (Left And Right Edge Detection) - Epson Stylus Pro 9000 - Print Engine Service Manual

EPSON Stylus Pro 9000
PAPER WIDTH DETERMINATION (LEFT AND RIGHT EDGE
DETECTION)
Before printing, the printer sets the platen gap and then flushes the printheads
to make sure no ink smears the paper. The printer then detects the left and
right edges of the paper. Note how "left" and "right" are defined below:
Right Paper Edge
To detect the left and right edges, the printer performs the following steps:
Table 2-5. Left and Right Edge Detection
Purpose Step
The carriage moves just to the inside of where the left edge
To make sure
1
should be, if the paper is loaded correctly.
paper is
loaded
The Paper Width Sensor checks for paper. If paper is
2
correctly
detected, go to step 3; otherwise report "Reload Paper" error.
To establish
The printer registers the sensor's "paper present" (ON) signal
sensor signal 3
level.
level
The carriage moves just to the outside of where the left edge
To make sure
4
should be, if the paper is loaded correctly.
paper is
loaded
The Paper Width Sensor checks for paper. If paper is not
5
correctly
detected, go to step 6; otherwise report "Reload Paper" error.
To establish
The printer registers the sensor's "no paper" (OFF) signal
sensor signal 6
level.
level
Technical Overview
Left Paper Edge
Printable Area
Action
Table 2-5. Left and Right Edge Detection (continued)
Purpose Step
To determine
The carriage moves to the left paper edge and registers its
position of left 7
position.
edge
8 The carriage moves to the right edge of the paper.
The Paper Width Sensor checks for paper. If paper is not
To determine
9 detected, go to step 10; otherwise, report "Reload Paper"
position of
error.
right edge
The printer registers the position of the right edge of the
10
paper.
11 The carriage returns to the left paper edge.
To verify left The Paper Width Sensor checks for paper. If paper is not
edge position 12 detected, go to step 13; otherwise, report "Reload Paper"
and determine error.
paper width
The printer verifies the edge position and registers the
13
distance from one edge of the paper to the other.
Action
31