Paper Lift Mechanism - Ricoh D158 Service Manual

Paper Lift Mechanism

2.3 PAPER LIFT MECHANISM
The paper size switch detects when the tray is pushed in.
When the paper tray is pushed into the machine, the pin [A] for the lift motor pressure shaft
engages the lift motor coupling [B] and the pin [C] for the bottom plate lift shaft in the tray engages
the bottom plate pressure lever coupling [D]. The pin [E] on the rear of the tray pushes the lock
lever so that the lift motor can lift the bottom plate pressure lever.
The lift motor turns on, and turns clockwise as viewed on the diagram. The main pressure spring
[H] pulls the bottom plate pressure lever, and this lifts the tray bottom plate.
When the top of the stack touches the feed roller, the motor cannot pull up the plate any more, so
it pulls the actuator [G] into the tray lift sensor [F].
The pressure of the feed roller on the paper is now too high, so the lift motor reverses to reduce
this pressure. It reverses for 300 ms or 600 ms, depending on the paper size. For smaller paper, it
reverses the larger amount (600 ms) to reduce the pressure more.
When the paper tray is pulled out, the pins [A, C] disengage from the couplings [B, D], and the
bottom plate drops. To make it easier to push the tray in, the lift motor rotates backwards 1.7
seconds to return the bottom plate pressure lever coupling [D] to the original position.
SM 15 D699