Brother International LK3-B431 MKII Instruction Manual - Page 33

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7-6-1. Guide to maximum sewing speed Use 8 layers of denim 12 layers of denim Ordinary materials knitted materials Max. sewing speed(rpm) 2,700 2,300 2,700 2,500 7. CORRECT USE NOTE: The thread may break due to heat under some sewing conditions. If this happens, reduce the sewing speed, or use the liquid cooling tank (option). Use 8 layers of denim Ordinary materials Max. sewing speed(rpm) 2,500 2,500 7-6-2 . Lower thread tension / weaker stronger o Adjust the thread tension to the weakest possible ten- sion by turning the thread tension nut until the bobbin case will not drop by its own weight while the thread end coming out of the bobbin case is held. 7-6-3 . Upper thread tension r 0 e---ek ....... StronWeak-. - t °Stronger Weaker Turn the tension nut O(main tension) to adjust the tension as appropriate for the material being sewn. Furthermore, turn the thread nut e(sub-tension) to adjust the remaining length of upper thread to 35 - 40 mm, when the thread take-up lever is not used. LK3-B430E-, 8431E-, B432E-, 8433E- Mark II 26

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7.
CORRECT
USE
7-6-1.
Guide
to
maximum
sewing
speed
<Standard
hook>
Use
Max.
sewing
speed(rpm)
8
layers
of
denim
2,700
12
layers
of
denim
2,300
Ordinary
materials
2,700
knitted
materials
2,500
<Large
hook>
Use
Max.
sewing
speed(rpm)
8
layers
of
denim
2,500
Ordinary
materials
2,500
7-6-2
.
Lower
thread
tension
/
weaker
stronger
7-6-3
.
Upper
thread
tension
r
0
t
e
----
ek
.......
Weak-
S
tron
.
-
-
°Stronger
Weaker
NOTE:
The
thread
may
break
due
to
heat
under
some
sewing
conditions.
If
this
happens,
reduce
the
sewing
speed,
or
use
the
liquid
cooling
tank
(option).
Adjust
the
thread
tension
to
the
weakest
possible
ten-
sion
by
turning
the
thread
tension
nut
o
until
the
bob-
bin
case
will
not
drop
by
its
own
weight
while
the
thread
end
coming
out
of
the
bobbin
case
is
held.
Turn
the
tension
nut
O(main
tension)
to
adjust
the
tension
as
appropriate
for
the
material
being
sewn.
Furthermore,
turn
the
thread
nut
e(sub-tension)
to
ad-
just
the
remaining
length
of
upper
thread
to
35
-
40
mm,
when
the
thread
take-up
lever
is
not
used.
LK3-B430E-,
8431E-,
B432E-,
8433E-
Mark
II
26