Detecting Topmost Sheet Of Paper In Tray - Canon SADDLE FINISHER K3 Service Manual

6.1.5 Detecting topmost sheet of paper in tray

Tray A and tray B are equipped with sensors that detect the height of the topmost sheet of
paper in the tray. The light-emitting sensors are tray paper sensor A and tray paper sensor
B. The light-receiving sensors are tray A paper sensor A and tray B paper sensor B. The
light-receiving sensors comprise three light-receiving cells.
The lowest cell is used to position the tray when there is no paper in it. The sensor output
changes when either of the upper two cells is blocked. By detecting with either of these two
cells, the tray can be held in the correct position, even if the trailing edge of the stacked pa-
per is curled up, due to contact with the stacking wall.
Paper
Paper
COPYRIGHT© 2001 CANON INC.
Light-emitting
cell (S5)
Tray A
Light-emitting
cell (S4)
F02-601-06
2000 2000 2000 2000 CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
CHAPTER 2 OPERATION OVERVIEW
delivery roller
Light-
receiving
cell (S5)
Stack delivery roller
Light-
receiving
cell (S4)
Tray B
Non-sort
(Front)
(Front)
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