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

15. BYPASS SECTION

15.3 Operation

15.3.1

Up/down control

A. Up drive operation
The lift plate [4] is of the construction in which it is pushed up by the spring [5] provided on the lower section.
However, while in the stand-by condition, it is hold down by the cam [3] provided on the lift drive shaft [6]. And
the ON/OFF of the gear [7] of the lift drive shaft is controlled by the stopper [1] that is driven by the pick-up sole-
noid /BP (SD1) [2]. When the feed motor (M9) is turned ON by a print start signal, SD1 turns ON a specified
period of time after that. In this way, the stopper is released and the driving force of M9 is transmitted to the lift
drive shaft. When the cam that holds down the lift plate is released by the rotation of the lift drive shaft, the lift
plate is brought up by the force of the spring. When the lift sensor (PS23) [8] is turned ON by the rotation of the
lift drive shaft, SD1 turns OFF to stop the up drive of the lift plate. This up drive operation causes paper loaded in
the tray to come in contact with the feed roller to allow paper to be fed.
[6]
[1] Stopper
[2] Pick-up solenoid /BP (SD1)
[3] Cam
[4] Lift plate
B. Down drive operation
When the vertical conveyance sensor (PS2) detects the leading edge of paper and turns ON, the pick-up sole-
noid /BP (SD1) turns ON a specified period of time after that and turns OFF a specified period of time after the lift
sensor (PS23) turns OFF. In this way, the cam of the lift drive shaft presses down the lift tray to be placed in the
stand-by condition.
52
[5] [4] [3]
Theory of Operation Ver1.0 Feb.2006
[7]
[2]
[5] Spring
[6] Lift drive shaft
[7] Gear
[8] Lift sensor (PS23)
[8] [6]
[1]
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