BE078130B0A
MODEL
LBH-781-782-783-784
Before
operating
your
JUKI
Lock
stitch
Machine,
please
read
this
In
struction
Book
carefully
in
order
to
operite
it in
the
correct
and
efficient
HIGH
SPEED
SINGLE
NEEDLE
LOCKSTITCH
STRIAGHX
BUTTON
HOLING
SEWING
MACHINE
Instruction
Book
CAUTION
IN
OPERATION
SPECIFICATIONS
1.
The
machine
should
rotate
counterclockwise
as
observed
from
the
pulley.
Take
care
not
to
rotate
the
machine in
the
opposite
direction.
2. Never start the machine before filling the machine base
with
lubricating
oil.
3.
Remove
the
bobbin
case
and
the
needle
thread
from
the
machine before performing
the
trial
operation.
4. Clean up
the
sewing'
hook
and
the
bobbin
thread
trimmer
every
day
after
sewing
work.
Also
check
the
level
of
the
lubricating
oil.
Application
Sewing
speed
Buttonhole
length
Bar-tack
width
Needle
Presser
lift
Lubricating oil
1.
MOTOR
PULLEY
AND
V
BELT
1. Motors
of
300W, 4-pole are used for single-phase or three-phase
operation.
(If
a 250W
motor
has to be used, operate the machine
at
3,100
s.p.m.
or
less.)
2.
M-type
V
belts
are
used.
3. Refer to the following table for the motor pulleys, V belt length,
and
sewing speed.
Sewing speed
Frequency
Motor
pulley Part No.
3,600
s.p.m.
B7262-781-000
B7263-781-000
3,400
s.p.m.
B725
6-781-000
B7257-781-000
B725
3-781-000
High speed
Vbelt
44
inch
43
inch
44
inch
42
inch
43
inch
Low
speed
Vbelt
42
inch
42
inch
43
inch
42
inch
42
inch
LBH-781
LBH-782 LBH-783 LBH-784
Buttonholing
for
ordinary
cloth,
knit,
etc.
Max.
3,600
s.p.m.
6.4~19.0mni
6.4~25.4mm
6.4~31.7mm
12.7~38.0m
(l/4"~3/4")
(1/4"~1")
,i®/4"-l-l/4")
(l/2"-I-l/2
mrATn''\
-S.Omin
(3/32"~3/l
6")
DPx5
#11~#14
12mm
{15/32")
JUKI
New
Defrix
Oil
No.
1
i
3,100
s.p.m.
B7254-781-000
42
inch
2,900
s.p.m.
B7258-781-000
B7259-781-000
42
inch
42
inch
42
inch
* How
to
install
motor
pulley
Place
motor
pulley 0
into
the
motor
shaft so
that
flat part © of the
motor
shaft aligns with first
setscrew o
Then
securely
tighten
setscrews
0
and
41
inch
(V
belt
Part No.: MTJ-VMOODDOO, V
belt
length)
*
How
to
install
V
belt
1. Mount high-speed V belt O oti accelerating pulley 0 and the largediameters of the motor pulley.
2. Mount low-speed V belt 0 on low-speed pulley 0 and the smalldiameters of the motor pulley.
3. By moving
the
motor
from
side to side, adjust
the
tension
of
V belts 0 and 0 so
that
they
give an approx. 10 mm slack
when
their
middle
portions
are
pushed
lightly
by
hand.
4. Move
the
motor
pulley
back
and
forth
to align V belts 0 and
0.
42
inch
i
Motor
pulley
From the library of: Superior Sewing Machine & Supply LLC
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