Epson Stylus Pro 7600 Service Manual page 110

EPSON Stylus Pro 7600/9600
Paper size detection sequence (front edge)
Conditions:
For execution of this processing, the paper level threshold value must be
known. (Execute this processing after detection of the right and left edges.)
Error display:
Set the paper correctly
When the paper width detection function is turned off, use the paper size front
position as the user paper setting position. (On the assumption that detection
is not made by the edge sensors)
Operating Principles
Front edge detection start
CR moves onto Fl_Box. (350CPS)
CR moves to the paper left upper detection position. *
While monitoring the edge sensor output, PF moves in the
negative direction (picks up paper). (40CPS)
PF stops if paper absence is detected. *
Paper absence detected
While monitoring the edge sensor output, PF moves in the
positive direction (gets paper off). (5CPS) The position where
paper presence is detected is judged to be the left front edge
position of the paper. *
CR moves to the paper right upper detection position.
No
Paper absence detected by
While monitoring the edge sensor output, PF moves in the
positive direction (gets paper off) (40CPS). PF stops if paper
presence is detected. (Prevention of skew at leading edge) *
Paper presence detected
While monitoring the edge sensor output, PF moves in the
negative direction (picks up paper) (40CPS).
PF stops if paper absence is detected. *
Paper absence detected
While monitoring the edge sensor output, PF moves in the
positive direction (gets paper off) (40CPS). The position
where paper absence is detected is judged to be the right front
edge position of the paper. *
The paper left front edge position and the right front edge
position are compared and the one in the positive direction
(upper one) is judged to be the paper size front position. *
Edge sensor LED is turned off.
Figure 2-8. Paper Size Detection Sequence (Front Edge)
Print Mechanism Components
Note "*1": Paper left upper detection position =
"*2": PF maximum travel = –260mm
1
2
"*3": PF moving target position = 1st
No
?
Yes
"*4": Paper right upper detection position =
"*5": In the figure below, the left upper
3
(350CPS) * 4
edge sensor?
Yes
3
No
?
Yes
2
No
?
Yes
3
3
Edge sensor LED is turned off.
Return
Revision A
Paper left edge position +27.5mm
(Self-diagnostics mode –340mm)
No change in sensor output even
when this travel has been exceeded is
handled as an error.
Stylus Pro 9600: 1260.5mm + 7.0mm
(Reserved width)
Stylus Pro 7600: 752.5mm + 7.0mm
(Reserved width)
nozzle position (0.00 mm)
No change in sensor output even
when this position has been passed is
handled as an error.
Paper right edge pos. –27.5mm
leading edge is handled as the paper
size front position. (On the
assumption that the paper front edge
is not correctly perpendicular to the
paper feed direction)
Solid Line: Paper
Broken Line: Printable
Area
Detection
position for left
Detection upper leading
position for edge position
right upper
leading edge
position
Error
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