PAPER FEED
10 August, 2001
2-48
2.8.4 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 shown in the diagram. The main
pressure spring [K] 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 lift sensor [F]. Then the lift motor
stops. The pressure of the feed roller on the paper is now too high, so the lift motor
reverses a certain time (200 ms or 600 ms), depending on the paper size, to
reduce this pressure. For smaller paper, it reverses the larger amount (600 ms) to
reduce the pressure more.
NOTE:
The relationship between the bottom plate pressure adjustment, paper size
thresholds, and the related SP modes is explained in “Bottom Plate
Pressure Adjustment for Paper Size”.
B027D521.WMF
B027D522.WMF
[A]
[B]
[D]
[C]
[D]
[B]
[A]
[I]
[J]
[E]
[C]
[E]
[H]
[K]
[G]
[F]