Plate-Up Function Of The Paper Tray - Brother HL-4040CN Service Reference Manual

3.2.1 Plate-up Function of the Paper Tray

The plate of the paper tray is pushed up by the force exerted by the motor not by springs so as
to keep paper-feeding performance constant irrespective of the quantity of papers remaining in
the tray. This paragraph provides an overview of this function.
At the time of inserting the paper tray into the main body of the product, the plate is kept
lowered. When the paper feed/belt cleaner motor is operated under such condition, a driving
force is transmitted to the lift gear Z42M75 by way of several gears. The force is also
transmitted to the plate-up plate to push up the plate.
Plate
When the plate is pushed up, the T1 lift arm goes down and the hook B is released. The PP
gear clutch cam off the hook B rotates to push down the rib of the hook A. Subsequently, the
ratchet of the hook A for the clutch gear deviates from the gear and the plate-up plate stops its
push-up function.
T1 lift arm
Plate
Lift gear Z42M75
Plate-up plate
Fig. Ref2-5
PP gear clutch cam
Hook B
Plate-up plate
Fig. Ref2-6
Ref. 2-5
Hook A
Clutch gear
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