Brother International LK3-B430 Service Manual - Page 8

Brother International LK3-B430 Manual

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FEED MECHANISM ® •0 0 0 0-' (1) Tack Width Mechanism 1. When upper shafts turns in the arrow direction, worm wheel 0 which is connected to vertical shaft 0 rotates in the arrow direction. Change gear W 0 in mesh with the lower end of vertical shaft 0 comes into mesh with • change gear C 0 which is engaged with feed cam 0 so that feed cam 0 rotates similarly in the arrow direction. 2. Roller 0 fits in the groove of feed cam 0 to convey the rocking motion to tack width feed lever 0. Tack width regulator lever 0. which is connected to tack width feed lever 0. similarly rocks. 3. Tack width lever m is connected to tack width regulator lever 0 with nut m so that it moves feed guides back and forth about tack width lever shafts as fulcrum. (2) Tack Length/ Mechanism 4. Roller 0 fits in the groove on the underside of feed cam 0 to convey the rocking'motion to back length feed Q ® lever about tack length feed lever shaft as fulcrum. ® 0 5. Tack length regulator lever is connected to tack length feed lever with nut Q so that it rocks tack length lever Q. Similarly, slide block • fits into the slot of feed guide 0 to move feed guide sidewise. 6. The combination of the motions mentioned in Paragraphs 3 and 5 produces a sewing pattern. r, • - 6 -

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FEED
MECHANISM
®
•
0
0
0
0—'
(1)
Tack
Width
Mechanism
1.
When
upper
shafts
turns
in
the
arrow
direction,
worm
wheel
0
which
is
connected
to
vertical
shaft
0
rotates
in
the
arrow
direction.
Change
gear
W
0
in
mesh
with
the
lower
end
of
vertical
shaft
0
comes
into
mesh
with
•
change
gear
C
0
which
is
engaged
with
feed
cam
0
so
that
feed
cam
0
rotates
similarly
in
the
arrow
direction.
2.
Roller
0
fits
in
the
groove
of
feed
cam
0
to
convey
the
rocking
motion
to
tack
width
feed
lever
0.
Tack
width
regulator
lever
0.
which
is
connected
to
tack
width
feed
lever
0.
similarly
rocks.
3.
Tack
width
lever
m
is
connected
to
tack
width
regulator
lever
0
with
nut
m
so
that
it
moves
feed
guides
back
and
forth
about
tack
width
lever
shafts
as
fulcrum.
(2)
Tack
Length
/
Mechanism
4.
Roller
0
fits
in
the
groove
on
the
underside
of
feed
cam
0
to
convey
the
rocking'motion
to
back
length
feed
lever
Q
about
tack
length
feed
lever
shaft
®
as
fulcrum.
5.
Tack
length
regulator
lever
®
is
connected
to
tack
length
feed
lever
0
with
nut
Q
so
that
it
rocks
tack
length
lever
Q.
Similarly,
slide
block
•
fits
into
the
slot
of
feed
guide
0
to
move
feed
guide
sidewise.
6.
The
combination
of
the
motions
mentioned
in
Paragraphs
3
and
5
produces
a
sewing
pattern.
r,
•
—
6
—