Brother International LK3-B431 MKII Instruction Manual - Page 40

Adjustments

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10 . STANDARD ADJUSTMENTS 10-3 . Adjusting the driver needle guard Needle center line Tip 0 Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw 0 and turn the eccentric shaft 0 to adjust so that the driver needle guard 0 contacts the needle. If the needle contact pressure is too great, skipped stitches may occur. On the other hand, if the driver needle guard Ois not touching the needle, the tip of the inner rotary hook will obstruct the needle, resulting in an excessively high amount of friction. 10-4 . Adjusting the needle clearance 0.01 - 0.08mm V Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw 0 and turn the eccentric shaft 0 to adjust so that the clearance between the needle and the rotary hook is 0.01 - 0.08 mm. 10-5 . Adjusting the shuttle race thread guide ( 0 0 0 Install the shuttle race thread guide 0 by pushing it in the direction of the arrow so that the needle groove is aligned with the center of the needle plate hole. NOTE: If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or catching of the thread may occur. 33 LK3-B430E-, B431E-, B432E-, B433E- Mark II

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10
.
STANDARD
ADJUSTMENTS
10-3
.
Adjusting
the
driver
needle
guard
Needle
center
line
Tip
0
Turn
the
machine
pulley
to
align
the
tip
of
the
rotary
hook
with
the
needle
center
line.
Then
loosen
the
set
screw
0
and
turn
the
eccentric
shaft
0
to
adjust
so
that
the
driver
needle
guard
0
contacts
the
needle.
If
the
needle
contact
pressure
is
too
great,
skipped
stitches
may
occur.
On
the
other
hand,
if
the
driver
needle
guard
Ois
not
touching
the
needle,
the
tip
of
the
inner
rotary
hook
will
obstruct
the
needle,
resulting
in
an
excessively
high
amount
of
friction.
10-4
.
Adjusting
the
needle
clearance
0.01
-
0.08mm
V
Turn
the
machine
pulley
to
align
the
tip
of
the
rotary
hook
with
the
needle
center
line.
Then
loosen
the
set
screw
0
and
turn
the
eccentric
shaft
0
to
adjust
so
that
the
clearance
between
the
needle
and
the
rotary
hook
is
0.01
-
0.08
mm.
10-5
.
Adjusting
the
shuttle
race
thread
guide
0
0
(
0
Install
the
shuttle
race
thread
guide
0
by
pushing
it
in
the
direction
of
the
arrow
so
that
the
needle
groove
is
aligned
with
the
center
of
the
needle
plate
hole.
NOTE:
If
the
shuttle
race
thread
guide
is
in
the
wrong
position,
thread
breakages,
soiled
thread
or
catching
of
the
thread
may
occur.
33
LK3-B430E-,
B431E-, B432E-,
B433E-
Mark
II