Ricoh PRIPORT VT 2000 Series Service Manual page 123

28 February '91
5.7 PAPER TABLE UP/DOWN MECHANISM
The paper table is raised and lowered by the paper table drive motor [A].
The paper end sensor [B] is actuated when the paper is set on the paper ta-
ble. When the Print Start key is pressed, the paper table drive motor starts
turning clockwise (X direction) and the worm gear [C] also turns. The worm
wheel [D] turns clockwise and the gears [E] on the both sides turn to raise
the racks [F].
As the paper table rises, the paper pushes against the paper feed rollers
[G]; thereby, raising the lever [H] which is mounted on the feed roller cover.
This activates the paper table height sensor [I] (the phototransistor senses
the light from the photocoupler, which up to now was cut off by the lever),
causing the paper table motor to turn OFF and stop raising the paper table.
As printing proceeds and the paper level runs down, the lever [H] cuts off
the light of photocoupler and the paper table motor turns clockwise until the
phototransistor is reactivated. As a result, the top of the paper stack is con-
stantly kept at the correct height.
When no paper is present, the paper end sensor is not activated and the pa-
per table motor turns counterclockwise (Y direction) to lower the paper ta-
ble. The paper table is lowered until the actuator [J] interrupts the lower limit
sensor [K].
When a misfeed occurs, the paper table motor turns counterclockwise
(Y direction) for one second, slightly lowering the paper table.
NOTE: The VT2100/VT2130/VT2150 use a photo interrupter sensor instead
of a photo reflective sensor [B].
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