Ricoh PCU10, Service Training Manual

Page: 173 / 195

2.16.2 Tray drive mechanism
Raising and lowering of the LCT bottom plate is done by
the tray motor, a dc servomotor. The drive train is
illustrated in the diagram.
Paper end detection
The paper end sensor (a reflective photosensor) detects
the paper end. When paper ends, the LCT bottom plate
is lowered.
Upper and lower limit detection
The upper limit sensor detects the upper limit of the tray
and the lower limit sensor detects the lower limit. This is
the same as the mechanism used in the main body tray.
The lower limit sensor is activated when the bracket of
the paper end sensor interrupts the lower limit sensor,
and the motor stops.
Overrun switches are provided for the upper and lower
limits. When the upper limit feeler is lifted by the paper,
the upper overrun switch is turned ON. Then, the motor
stops.
When the right bottom plate support shaft turns the
lower overrun switch ON, the motor stops.
Tray drive chain
Paper end sensor
Upper limit sensor
Tray drive chain (rear)
Worm gear
Worm gear shaft
Tray motor
Timing belt
Pulley (50T)
Sprocket (14T)
Gear (27Z)
LCT
bottom
plate
End sensor bracket
Left bottom plate
support shaft
Paper
end
sensor
Upper limit feeler
Upper overrun switch
Tray motor
Worm gear shaft
Pulse generator disk
Paper volume sensor
Lower overrun switch
Lower limit sensor
Right bottom plate
support shaft
1 July 1994 Large Capacity Tray
2-137