COPYRIGHT© 2001 CANON INC.
2000 2000 2000 2000
CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
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CHAPTER 2 OPERATION OVERVIEW
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.
F02-601-06
Tray B
Stack delivery roller
Light-emitting
cell (S4)
Non-sort
delivery roller
Paper
(Front)
Light-
receiving
cell (S4)
Tray A
Light-emitting
cell (S5)
Paper
(Front)
Light-
receiving
cell (S5)