Tray Drive Mechanism - Ricoh FT7770 Service Manual

3. Tray Drive Mechanism

Drive from a reversible ac motor is transmitted through a timing belt and a
worm gear to the drive pulley shaft.
them. These beads are inserted in slots at the ends of the tray support rods;
so, when the wire pulley turns (clockwise, rear view), the beads on the
wires drive the tray support rods and the tray moves upward.
velocity of the option tray motor is about 2.4 times faster than copier
trays, the option tray overshoots while moving to the up position. To stop
the tray at the proper position, a sensor (overrun sensor) is provided at the
upper position of the tray lift sensor.
lift sensor actuates, and then overrun sensor is actuated by the motor
inertia. The motor starts again in opposite direction until the overrun
sensor de-actuates.
To lower the tray, the pulley turns counterclockwise until the tray down
sensor turns off.
Related Service Call Conditions: See FIELD MANUAL for detail.
SC 25: Option Tray Failure
So the tray stops at the proper position.
8-7
The tray wires have metal beads on
The tray motor rotates until the tray
30
April, '89
Since the