Brother International LK3-B430 Service Manual - Page 9

Brother International LK3-B430 Manual

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THREAD TRIMMER MECHANISM 0• (I) 0 00 0 • i r O- (?) ID 0 1. When power cam 0 rotates one half of a turn in the arrow direction. roller 0 in contact with the cam part® of power cam 0 Oushed down so that the motionisconveyed via thread trimminglink to camlever 0 through driving shaft 0 as fulcrum. 2. Cam lever 0 conveys the motion to connecting rod via cam lever shaft 0 as fulcrum to forcibly return movable knife 0 via thread trimming arm B 0. which is connected to thread trimming arm A 0. to a specific e position. 3. When roller rides on the periphery of knife came. roller holders gets under roller m to hold roller m there till 4 stitches before the final stitch. 4. When cam lever claw 0 drops from the periphery of knife cam (1) one half into its recess. movable knife (r) scoops an upper thread loop up and stop before the needle hole: and when work clamp lifter roller shaft a) disengages from start lever claw S. power cam 0 rotates one half of a turn and movable knife m cuts the thread. -7-

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THREAD
TRIMMER
MECHANISM
0
0
0
0
•
i
r
0•
(I)
O
—
ID
(?)
1.
When
power
cam
0
rotates
one
half
of
a
turn
in
the
arrow
direction.
roller
0
in
contact
with
the
cam
part®
of
power
cam
0
Oushed
down
so
that
the
motion
is
conveyed
via
thread
trimming
link
to
cam
lever
0
through
driving
shaft
0
as
fulcrum.
2.
Cam
lever
0
conveys
the
motion
to
connecting
rod
via
cam
lever
shaft
0
as
fulcrum
to
forcibly
return
movable
knife
0
via
thread
trimming
arm
B
0.
which
is
connected
to
thread
trimming
arm
A
0.
to
a
specific
position.
3.
When
roller
e
rides
on
the
periphery
of
knife
came.
roller
holders
gets
under
roller
m
to
hold
roller
m
there
till
4
stitches
before
the
final
stitch.
4.
When
cam
lever
claw
0
drops
from
the
periphery
of
knife
cam
(1)
one
half
into
its
recess.
movable
knife
(r)
scoops
an
upper
thread
loop
up
and
stop
before
the
needle
hole:
and
when
work
clamp
lifter
roller
shaft
a)
disengages
from
start
lever
claw
S.
power
cam
0
rotates
one
half
of
a
turn
and
movable
knife
m
cuts
the
thread.
—7—