Brother International FAX-170 Service Manual - Page 19

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2.3.2 Description of planetary gear system The planetary gear train consists of the sun gear 18/82, two planet gears 20, arm A, and arm B, as shown below. Motor gear Stopper of arm A Sun gear 18/82 Planet gear 20A Planet gear 20B Arm B Arm A Planetary Gear System If the motor rotates, the sun gear 18/82 rotates so that the rotational torque is transmitted to the engagement between the sun gear and the planet gears 20. Since the arms and planet gears are so designed that the moment of the arms is less than that of the planet gears, the arms turn around the center shaft in the same direction as the sun gear 18/82. If the planet gear(s) becomes engaged with any other gear so that the arm cannot turn any more, the rotational torque of the sun gear 18/82 is transmitted to that planet gear. Accordingly, the planet gear starts rotation in the opposite direction of the sun gear 18/82.

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2.3.2
Description
of
planetary
gear
system
The
planetary
gear
train
consists
of
the
sun
gear
18/82,
two
planet
gears
20,
arm
A,
and
arm
B,
as
shown
below.
Motor
gear
Planet
gear
20B
Stopper
of
arm
A
Sun
gear
18/82
Planet
gear
20A
Arm
A
Arm
B
Planetary
Gear
System
If
the
motor
rotates,
the
sun
gear
18/82
rotates
so
that
the
rotational
torque
is
transmitted
to
the
engagement
between
the
sun
gear
and
the
planet
gears
20.
Since
the
arms
and
planet
gears
are
so
designed
that
the
moment
of
the
arms
is
less
than
that
of
the
planet
gears,
the
arms
turn
around
the
center
shaft
in
the
same
direction
as
the
sun
gear
18/82.
If
the
planet
gear(s)
becomes
engaged
with
any
other
gear
so
that
the
arm
cannot
turn
any
more,
the
rotational
torque
of
the
sun
gear
18/82
is
transmitted
to
that
planet
gear.
Accord-
ingly,
the
planet
gear
starts
rotation
in
the
opposite
direction
of
the
sun
gear
18/82.