Operation; Up/Down Control - Konica Minolta bizhub 500 Service Manual

14. PAPER FEED SECTION (Tray 1/2)

14.3 Operation

14.3.1

Up/down control

A. Up drive operation
The lift drive shaft [3] is rotated by the paper lift motors /1 (M7) [6] and /2 (M8) [7]. The lift drive shaft is provided
with the lift arm [1] and the lift plate [2] is pushed up when the lift drive shaft rotates. In this way, the up drive
operation of the lift plate is conducted.
B. Down drive operation
Pulling out the tray disengages the coupling [8] of the paper lift motors /1 (M7) and /2 (M8) from the lift drive
shaft. In this way, the driving force of M7 or M8 that holds the lift plate at the upper position is released and the
lift plate goes down by its own weight.
[6] [7]
[4] [5]
[1] Lift arm
[2] Lift plate
[3] Lift drive shaft
[4] Tray set sensor /1 (PS8)
[5] Tray set sensor /2 (PS14)
C. Operation timing
When the tray is set, the tray set sensors /1 (PS8) and /2 (PS14) turn ON. In this way, the paper lift motors /1
(M7) and /2 (M8) turn ON to raise the lift plate. When the lift plate goes up and the upper most paper that is
loaded turns ON the upper limit sensors /1 (PS6) and /2 (PS13), M7 and M8 turn OFF to stop the up drive oper-
ation.
When the paper feed operation causes PS6 and PS13 to turn OFF from ON while in the print operation, M7 and
M8 turn ON again to raise the lift plate. In this way, when PS6 and PS13 turn ON again, M7 and M8 turn OFF to
stop the up drive operation.
42
[8]
[3]
[6]
[7]
[8]
[9]
[10]
Theory of Operation Ver1.0 Feb.2006
[9][10]
[1]
[2]
Paper lift motor /1 (M7)
Paper lift motor /2 (M8)
Coupling
Upper limit sensor /1 (PS6)
Upper limit sensor /2 (PS13)
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