Brother Intelli FAX-2820, Service Manual

Page: 51 / 321

Confidential 3 - 6
3.2.4.2 Push-up function of paper tray
In order to improve the transfer function of the paper tray, the pressure plate in the paper tray is
lifted up by the motor.
(1) The pressure plate comes down while the recording paper tray is inserted into the machine.
When the main motor rotates, it drives through some gears to actuate the gear 45 arm/FR.
The driving force that 45 arm/FR received is to be transferred to gear 13 center P/R, it then
drives through some gears to gear 17. The gear 17 actuates the up plate gear of the recording
paper tray to push up the pressure plate.
(2) When the pressure plate is pushed up, the paper placed on the pressure plate is contacted with
the pick up roller holder ASSY so that the pick up roller holder ASSY is pushed up.
(3) When the pick up roller holder ASSY is pushed up more, one end of the link lever assembled
on the pick up roller holder ASSY is pushed up. Since the center of the link lever is held as a
fulcrum, the other end of the link lever comes down.
(4) The other end of the link lever is contacted with the hook B and hook C so that the hook B is
pushed down when the link lever comes down.
(5) When the hook B is pushed down, the catch of the hook B is released from the lock of the
sector cam.
(6) The sector cam is rotated by approximately three quarters when the catch of the hook B is
released.
(7) Then, the sector cam is stopped rotating by the catch of the hook C. (The hook B and hook C
is connected with the spring. When the hook B is pushed down, the hook C is also pushed
down, and the catch of the hook C is released from the lock of the sector cam.)
(8) When the sector cam is fixed at the position of the catch of the hook C, the hook A is lifted
up by the sector cam.
(9) The inside gear of the gear 13 center P/R, which has been fixed, is released.
(10) When the inside gear of the gear 13 center P/R is released, the central gear of the gear 13
center P/R is stopped rotating. Then, the gear pushing up the pressure plate in the paper tray
is stopped so that the pressure plate is stopped lifting up.
The gear 13 center P/R consists of the three gears, and power of the main motor is added onto the
outside gear. When the inside gear is fixed while the main motor power being added, the central
gear is started rotating. When the fixed inside gear is released, the central gear is stopped, and the
inside gear is rotated.