Brother International LK3-B430 Service Manual - Page 5

Chanem

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CMEcHANEM ,.* NEEDL BAR, THREAD TAKE-UP LEVER, LOWER SHAFT, SHUTTLE MECHANISMS 0 0 A 0 9 0 0- - 0- - - 0 (1) Needle Bar and Thread Take-up Lever Mechanism I. When pulle 0 turns in the arrow direction. its rotating motion is conveyed to counter weight Q which is connected to upper shaft 0. 2. Needle bar crank 0 is attached to counter weight 0 so that needle bar clamp 0 is moved up and down via needle bar crank rod 0. 3. Needle bar O. which is gripped by needle bar clamp 0. is guided by needle bar bushing U 0. needle bar bushing D 0 and needle bar guide slide block m to smoothly run up and down. (2) Lower Shaft and Shuttle Mechanism moves 4. When pulley O turns in the arrow direction. crank rode up and down via the crank part ® of the upper e. shaft. 5. The louer end of crank rod ® is connected to rock gear and rocks about rock gear shaft (1). ® e 6. Rock cear s engages lower shaft gear ® which is fixed to lower shaft O. and turns lower shaft one half of a turn. Similarly. its motion is cons eyed to driver attached to the tip of lower shaft to drive shuttle one half of a turn. -3-

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cHANEM
,.*
CME
NEEDL
BAR,
THREAD
TAKE-UP
LEVER,
LOWER
SHAFT,
SHUTTLE
MECHANISMS
0
0
9
0-
—
—
0
0
0-
—
A
0
(1)
Needle
Bar
and
Thread
Take-up
Lever
Mechanism
I
.
When
pulle
0
turns
in
the
arrow
direction.
its
rotating
motion
is
conveyed
to
counter
weight
Q
which
is
connected
to
upper
shaft
0.
2.
Needle
bar
crank
0
is
attached
to
counter
weight
0
so
that
needle
bar
clamp
0
is
moved
up
and
down
via
needle
bar
crank
rod
0.
3.
Needle
bar
O.
which
is
gripped
by
needle
bar
clamp
0.
is
guided
by
needle
bar
bushing
U
0.
needle
bar
bushing
D
0
and
needle
bar
guide
slide
block
m
to
smoothly
run
up
and
down.
(2)
Lower
Shaft
and
Shuttle
Mechanism
4.
When
pulley
O
turns
in
the
arrow
direction.
crank
rode
moves
up
and
down
via
the
crank
part
®
of
the
upper
shaft.
5.
The
louer
end
of
crank
rod
®
is
connected
to
rock
gear
e.
and
rocks
about
rock
gear
shaft
(1).
6.
Rock
cear
s
engages
lower
shaft
gear
®
which
is
fixed
to
lower
shaft
O.
and
turns
lower
shaft
one
half
of
a
turn.
Similarly.
its
motion
is
cons
eyed
to
driver
®
attached
to
the
tip
of
lower
shaft
to
drive
shuttle
e
one
half
of
a
turn.
—3—