PAPER FEED
10 August, 2001
2-50
2.8.6 PAPER HEIGHT DETECTION
The amount of paper in the tray is detected by the combination of on/off signals
from two paper height sensors [A] and [B].
The paper amount is displayed on the
LCD.
When the amount of paper decreases, the bottom plate pressure lever [C] moves
the actuator up.
The following combination of sensor signals is sent to the copier.
Amount of Paper
Paper Height Sensor 1 Paper Height Sensor 2
Near End
OFF
ON
30%
ON
ON
70%
ON
OFF
100%
OFF
OFF
When the tray contains paper of a small width, the paper feed pressure may
become too low when the thickness of the remaining stack of paper has
decreased. The lift motor rotates forward 400 ms after the sensor detects a certain
amount of paper remaining in the tray to increase paper feed pressure, simulating
the pressure generated by a full tray.
NOTE:
The relationship between the bottom plate re-adjustment timing, paper size
threshold, and the related SP modes is explained in “Bottom Plate
Pressure Adjustment for Paper Size”.
B027D522.WMF
[C]
[C]
[B]
[A]