DETAILED DESCRIPTIONS
B834 28 SM
2.4 REMAINING PAPER DETECTION
[A] Paper Height Sensor Actuator
[B] 4th Paper Height Sensor 4
[C] 4th Paper Height Sensor 3
[D] 4th Paper Height Sensor 2
[E] 4th Paper Height Sensor 1 (Near End)
Each tray has four paper height sensors. The illustration above shows the paper
height sensors in the 4th tray. This arrangement is duplicated in the 5th and 6th
trays.
The amount of paper remaining in the tray is detected by the three paper height
photo-interrupter sensors on the left rail as the bottom plate rises. Five states,
determined by the position of the actuator [A] are possible.
1. With the actuator [A] below paper height sensor 4 [B], no sensor is actuated
and the display indicates 100%.
2. When the actuator passes paper height sensor 4 [B] , the display indicates 70%
of the paper supply remaining.
3. When the actuator passes paper height sensor 3 [C], the display indicates 30%
of the paper supply remaining.
4. When the actuator passes paper height sensor 2 [D], the display indicates 10%
of the paper supply remaining.
NOTE: When the actuator enters the gap of the near end sensor [E], the
machine signals near end.
Finally, when the last sheet feeds, the paper end sensor signals that the tray is
empty.
B834D109.WMF
[A]
[B]
[C]
[E]
[D]
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