Ricoh FT4460, Service Manual, Page: 116 / 413

28 February 1989
9.4 PAPER LIFT MECHANISM (1st Feed Station)
When the cassette [A] is inserted into the copier, the cassette actuator pin [B]
is pushed down by the cassette. The lift motor unit then mechanically pivots
clockwise at point [C] so that the lift gear [D] engages with the sector gear
[E].
Simultaneously, the paper size actuator plate [F] actuates the paper size
switches [G]. The I/O control PCB then detects that a cassette has been in-
serted and turns on the lift motor [H]. The lift motor raises the bottom plate [I]
until the top sheet pushes up the pick-up roller [J].
When the paper pushes up the pick-up roller, the lift sensor [K] is actuated
(OFF) and the l/O control PCB turns off the lift motor.
As paper is fed into the copier, the level of the paper stack gets lower. If the
level becomes too low, the lift sensor is de-actuated (ON) and the l/O control
PCB energizes the lift motor until the top sheet raises the pick-up roller to ac-
tuate the lift sensor again. This ensures that the paper is always at the correct
feed height.
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