Power Transmission Mechanism; Structure Of The Gear Train; Color - Brother FAX1170 Service Manual

2.3

Power Transmission Mechanism

The equipment has a single drive motor whose power transmission route can be switched by
the planetary gear systems and the solenoid. This switching allows the equipment to func-
tion in four operation modes (scanning, paper feeding/ejecting, recording, and copying
modes). For the details about the planetary gear systems, refer to Subsection 2.3.2.
2.3.1

Structure of the gear train

At the left side of the equipment, the rotational torque of the motor on the main frame is
transmitted to the gears on the main frame and then to the gears on the platen frame. These
gears drive the document feeding/ejecting related rollers, paper feeding/ejecting related roll-
ers, and the platen.
If the platen gear ("a" in the figure below) on the left end of the platen shaft rotates, the gear
33RB ("b") on the right end also rotates. This way, the rotational torque is transmitted to the
gears on the right side of the equipment.
At the right side of the equipment, the rotational torque is further transmitted via the friction
torque transmission ASSY to the ribbon drive gear ("e") which drives the ribbon take-up gear
in the ribbon cartridge.
Right side
c (Gear 20/40)
b (Gear 33RB)
Left side
T (Paper feed roller gear, Gear 55)
Platen frame
S (Planet gear
34 of Arm P
ASSY)
R (Sun gear
39/24)
Main frame
Q (Gear 33)
d (Gear 18)
(Gears 18/41)
V
U
O (Gear 39)
Y (Planet gear 44 of
P (Gear 18)
Arm C ASSY)
B (Sun gear 20/90)
Gear Train
W (Clutch gear ASSY)
X (Paper ejection roller gear, Gear 40)
a (Platen gear, Gear 23)
N (Sun gear
36/27)
A (Motor gear)
L (Planet gear 20A of Arm A ASSY)
III – 5
e (Gear 46 of Friction torque
transmission ASSY)
Main frame
Platen frame
e (Ribbon drive gear, Gear 24)
Z (Gear 33/45)
M (Gear 39)
C (Planet gear 20B of Arm B ASSY)
D (Gear 33)
F (Separation roller gear)
I (White pressure
roller gear)
E (Gear
G H J
20/40)
(Gears 14/20)
Clutch lever
: Gears on the main frame
: Gears on the platen frame
(Front)
K (Document
ejection roller
gear)