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CF5001 Ver.1.0 Sep. 2003 PAPER FEED TRAY /1 TO /3
2-41
II UNIT EXPLANATION
8.2.2 Up/down plate control
The up/down plate in the paper feed tray is driven by the wire.
When the paper feed tray /1 is set to the main body, the tray up drive motor /1 (M40) of the main body
starts to rotate. As a result, the wire is wound around the drive pulley and the up/down plate goes up.
When the tray upper limit sensor /1 (PS30) detects the upper limit of paper, the M40 turns off. When the
amount of paper gets reduced as a result of the passage of paper, a no paper detection is made by the
PS30. At this time, the M40 keeps on until the PS30 detects the upper limit of paper again. Accordingly,
paper is lifted up to the fixed level at all times.
When the paper feed tray /1 is pulled out, the coupling is released from the drive section and the up/down
plate goes down by its own weight.
8.2.3 Remaining paper detection control
The amount of remaining paper is detected by the remaining paper sensor /1 (PS32). As the amount of
paper in the tray is getting reduced, the actuator provided at the front of the tray rotates gradually. The
PS32 turns on and off each time a slit in the actuator passes through. The main body control section
counts the number of on/off's of the PS9 after the installation of the tray to detect the amount of remaining
paper in 4 steps.
The detection of no paper is made by the no paper sensor /1 (PS31).
No. of the slit counts Remaining paper in the tray Indication of remaining amount
on the operation board
0 100 to 75 % 4 lit
1 75 to 50 % 3 lit
2 50 to 25 % 2 lit
3 25 to 0 % 1 lit
[1] Rotational direction when the up/down plate goes up [4] Slit 2
[2] Remaining paper sensor /1 (PS32) [5] Slit 3
[3] Slit 1 [6] Actuator
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