Epson Stylus Pro 7600 - UltraChrome Ink Service Manual - Page 110
Paper Size Detection Sequence Front Edge
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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) Revision A Front edge detection start Note "*1": Paper left upper detection position = Paper left edge position +27.5mm CR moves onto Fl_Box. (350CPS) CR moves to the paper left upper detection position. *1 While monitoring the edge sensor output, PF moves in the negative direction (picks up paper). (40CPS) PF stops if paper absence is detected. *2 "*2": PF maximum travel = -260mm (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) Paper absence detected No ? Yes 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. *3 CR moves to the paper right upper detection position. (350CPS) *4 "*3": PF moving target position = 1st nozzle position (0.00 mm) No change in sensor output even when this position has been passed is handled as an error. "*4": Paper right upper detection position = Paper right edge pos. -27.5mm "*5": In the figure below, the left upper 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) No Paper absence detected by edge sensor? Yes 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) *3 Solid Line: Paper Broken Line: Printable Area Paper presence detected No ? Yes While monitoring the edge sensor output, PF moves in the negative direction (picks up paper) (40CPS). PF stops if paper absence is detected. *2 Paper absence detected No ? Yes 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. *3 Detection position for right upper leading edge position Detection position for left upper leading edge position 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. *3 Edge sensor LED is turned off. Edge sensor LED is turned off. Return Error Figure 2-8. Paper Size Detection Sequence (Front Edge) Operating Principles Print Mechanism Components 110