Juki LH-512, LH-515 Instruction Manual
No.OO
BE5150SOBOA
CONTENTS
I.
GENERAL DESCRIPTION
l.
Remarkable features
2.
Specifications
II. INSTALLATION AND
l.
Installation............................................................................................................... 3
2.
Motor pulley and belt
3.
Preparation for operation
III.
HOW
TO OPERATE THE MACHINE
I. Lubrication.............................................................................................................. 5
2.
Lubrication
3.
Attaching the needles
4.
Twist
of
5.
Passing the needle thread
6.
Passing the bobbin thread
7.
Adjusting the thread tension
8. Adjusting the stitch length
9.
Reverse feed (LH-515)
IV.
HOW
TO ADJUST THE MACHINE
l.
Timing
2.
Adjusting
3.
Movement
4.
Adjusting
the blade
5.
Detaching and attaching the sewing hook
6.
Adjusting the height of feed dog
7.
Adjusting the needle bar frame
8.
Adjusting the maximum stitch length (LH-515)
9.
Replacing the timing belt
10. Adjusting the position
V.
HOW
TO OBTAIN IDEAL SEWING CONDITIONS
Standard sewing conditions
Troubles and corrective measures
.........................................................................................................
OPERATION
.......................................................................................
.................................................................................
of
the sewing hook
.......................................................................................
thread
......................................................................................................
........................................................................................
of
the bobbin case opening motion
the
bobbin case opening mechanism
of
the needle and the sewing hook
the
clearance between the needle and
point
of
sewing hook
of
.....................................................................
.................................................................................
.................................................................................
...........................................................................
..............................................................................
.............................................
.......................................
..........................................
...............................................................
................................................
..................................................................
.....................................................................
.......................................
.................................................................................
the timing belt
....................................................................................
........................................................................
...................................................
2
3
4
6
6
6
7
8
8
10
I 0
11
11
12
13
14
14
15
16
16
17
18
19
I.
GENERAL DESCRIPTION
JUKI Model LH-512
machine with a sewing speed
JUKI Model LH-515
machine equipped with reverse feed mechanism, which
high speed operations
at excellent durability.
1.
REMARKABLE FEATURES
is
a high speed, 2-needle, needle feed, lockstitch industrial sewing
of
4,200
s.p.m.
is
a high speed, 2-needle, needle feed, lockstitch industrial sewing
is
designed for withstanding
up
to
the
maximum sewing speed
of
3,500
s.p.m. and for aiming
o Link type thread take·up
This
type
of
industrial sewing machine has usually been designed
on
the
principle of a slide
sewing speed and durability. By overcomming such technical problems,
Model LH-515 has successfully been designed
take-up mechanism which has sufficient durability
type
thread take-up, although it was
to
employ
without
the
puckering
o Feed mechanism
This model employs a push
For
needle bearings.
high speed operation, a durable and seizure-free material is used
block
type
feed driving mechanism.
the
button
purpose
type
lead cam regulating system and also
of
preventing any abrasion
o Lubrication system
The lubricating oil y.rhich
pump
located on
driving shaft saddles, pushed
also
is
delivered
face plate
take-up lever shaft.
All
other
bearing metals are made
lubrication.
to
is
constantly
the
is
fed from
hook
driving shaft
up
the
thread take-up lever shaft.
lubricated through
the
to
the
oil sight window
of
special sintered alloy which does
oil reservoir by means
is
distributed
the
oil wicks connected
to
the
on
the
The
inside mechanism
o Bobbin case opening mechanism
The
bobbin
achieve one
the
conventional models
the
improvement extends
running noise.
case opening mechanism
motion
while
of
the
which
the
sewing
the
life-time
of
the
Model LH-515
hook
rotates twice, being different from
mechanism achieves
of
the
sewing
is
two
hook
o Hook shaft bearings
High speed feature and durability
precision needle bearings in
and right.
the
of
upper
this model
bushings
of
is
assured
hook
shafts
to
be operated
not
sufficient in
JUKI
link
type
thread
the
fabrics.
or
seizure during a
for
the
of
the
plunger
left and right
machine arm and
to
so designed as
motions. Thus,
and minimizes
by
employing
on
the
the
not
both
hook
of
thread
slide
the
need
to
the
left
-1-'-
2.
SPECIFICATIONS
LH·515
Sewing
type
.......................... 2-needle, lockstitch, needle feed, with reverse feed
(by
mechanism
feed control lever).
Application ........................... Light and medium heavy weight materials. (Men's
shirts cuffs, front flies, attaching pockets
uniforms, felling trousers, attaching tapes
to
working
to
materials and sewing side face and waist inside
men's jackets, etc.)
Sewing speed ......................... Max.
Thread take-up ...................... Link
Needle bar stroke ..................
Needles .................................
Presser lifting amount ...........
3,500 s.p.m.
type
thread take-up
33.4mm
DP
DP
( 1-5/ 16")
x 7, No.I I,
x 5, No.I I,
7mm(9/32")
No.l4,
No.l4,
No.l6
No.l6
or
by hand lifter, 10mm(25/64")
by
lifter.
Feed mechanism ...................
Stitch length ......................... Max.
Stitch
length regulator .......... Feed eccentric adjustment system (by push
Needle gauge .........................
Bottom
4mm(5/32")
11
3/32
, 1/8
3/8",
l/2",
1-3/8",
feed and needle feed.
11
11
,5/32
,
3/16",
5/8",
3/4",
7/8",
1-l/2''
7/32",
I",
1/4",
1-l/8",
button).
9/32",
l-l/4",
Sewing hook ........................ Horizontally arranged automatic lubricating hooks for
high speed operation.
Lubrication system .............. Automatic lubricating system
by
means
of
pump and lead pump.
Driving
Table .................................. Table for model
motor
...................... 3-phase 400W
0/2HP)
LH-5
clutch mtor.
l 5
tricot
of
knee
5/16",
plunger
LH-512
Sewing type ........................ 2-needle, needle feed, lock stitch
Sewing speed .......................
other
(All
specifications are same
Up
to
4,200
as
LH-515)
s.p.m.
-2-
II.
INSTALLATION AND OPERATION
1.
INSTALLATION
The
following procedure will simplify
(1) Hinges
First
of
all,
you
must fix
the
accessory
Make suitable recessions on
width
their
positions
(2) Setting
The oil reservoir must
supported by 4 corners
---
rubber
and thickness
with
the
oil reservoir
hinges.
of
such
2 pieces
be
thereon
~
set
~~F~
~
Hmark
Fig.
-~
1
your
installation works;
the
machine head
the
table using a round
rubber
hinges tightly fit
of
nails.
in
the
opening prepared on
as
shown in
1.
2.
3.
4.
5.
(Note) Knee press rod bearing
the
Nail
corners
opening
Similarly, nail
the
side).
Place
felts.
Insert rubber cushions
Put
cushions.
onto
the
table
or
straight chisel so
them
and nail
the
illustration.
4mm
thick felts
of
the
near side
(operator's
6mm
two
corners
the
the
round felts over
CD
should be installed as
in
the
of
oil reservoir on
figure.
by
means
the
hinges on
table so
on
of
side).
thick
the
far side (hinge
top
into
4 corners.
the
that
the
that
it
the
two
the
table
felts on
of
these
rubber
bracket
shown
of
is
~I
2.
MOTOR PULLEY AND BELT
Use a 3-phase
Following tab!e shows the relationship between
machine
50
Hz
with
400
W motor. The belt
the
dimension
Rotation
of
machine
4,200 s.p.m.
4,000 s.p.m.
3,800 s.p.m.
3,400 s.p.m.
3,000
s.p.m.
of
is
M-type V belt.
the
motor
Part No.
MTKMTK-P0095000
MTK-PV090000
MTK-PV080000
MTK-PV070000
-3-
the
number
pulley (effective diameter).
of
motor
pulley
PV 1
00000
· 100
of
Effective dia.
of
motor
95
90
80
70
rotation
pulley
rp
rp
rp
rp
rp
of
the
Rotation
of
machine
4,200
s.p.m.
4,
000
s.
p.m.
60Hz
(Note)
3.
PREPARATION
(I)
(2)
For
of
For
In the meantime, the machine will warm
Fill the oil reservoir with lubricating
oil
up
"H",
take
out
of
the accessory box and place
under
the
to
absorb noise and dust.
Those machines which are
for the first time
after
a long period
must apply 2
through
Fig.2.
3,800
s.p.m.
3,400 s.p.m.
3,000
s.p.m.
the first one
less than
LH-515, operate
to
hook
the oil holes
3,800
FOR
the level marked
an
urethane
driving
after
or 3 drops
month,
s.p.m.
OPERATION
foam sheet
shaft
setting
of
disuse,
j)
as shown in
Part
No. of
motor
MTK-PV085000
MTK-P0080000
MTK-PV075000
MTK-P0065000
MTK-
PV060000
operate
the
machine with less than
with
it
saddles
operated
up
or
you
of
oil
the
3,000
Fig.
Effective dia.
of
motor
pulley
85 ¢
80 ¢
¢
75
¢
65
¢
60
s.p.m.
2
pulley
LH-512 machine with a speed
up
appropriately.
(3)
Provide
lubricating oil will be circulated slowly
(4)
Precaution
o If
the oil gauge, verify the following points:
(a)
(b)
o When the oil has reached the
machine.
Be
your
machine with
you
have
to
If
the volume
If
the
plunger
(If
the plunger has
the
lubricating oil will
position
sure
to
of
verify
an
idle
wait for 10 seconds
of
oil
is
too
short,
pump
is
normally running.
not
been aligned with the groove on the
not
be delivered pl·operly. In such a case, correct the
the bushing on the
"L"
that
the oil is completely filled
run
after
pushing
to
the
oil gauge
or
more until
hook
driving shaft accordingly.)
mark
of
you
the
oil reservoir,
up
to
up
the
within
observe
the
"H"
presser
2 ~ 3 seconds.
foot,
the
lubricating oil in
hook
driving shaft,
stop
running the
mark.
and
the
-4-
Ill.
HOW TO OPERATE THE MACHINE
1.
LUBRICATION
The
amount
plate mechanism has normally been ad-
justed at
necessary, you may adjust it
the
adjusting screw shown in
The stable
supplied
from
through
Check the following points:
(I)
2 oil wicks
The
(2)
screwed in
(3)
The
surfaces
(4)
To
Hold a piece of rough paper facing
blot
seconds, repeat this intermittent test for 2 minutes and judge the amount of oil
from the blot on
the optimum distribution
(5) The lubricating oil must come up in the oil gauge within 3 seconds after
machine has been started
of
oil
to
lubricate
our
factory before shipment.
amount
to
. the face plate mechanism
the
thread take-up lever shaft
the
oil wicks.
oil adjusting screw (Fig.3) located under the machine bed should have been
tips
of
of
check the amount
it
with
of
oil
(3c/>)
must be passed through
by
3 or 4 turns.
oil wicks sheathed with aluminium pipe are very slightly touching the
the needle crank rod and
splashed
the
the
face
If
by
turning
the
Fig.3.
is
constantly
Fig.
3
the
thread take-up lever shaft.
the
needle bar.
of
oil:
to
the mechanism
oiL
Run the machine for 5 seconds and then stop it for 5
paper under
of
to
the
bright sunlight or artificial light. Fig.5 shows
oil spots on the test paper.
run.
as
shown
in
Fig.4 so
as
to
the
• •
Fig.
4
Fig.
5
-5-
2.
LUBRICATION TO THE SEWING
HOOK
The
amount
ing
hook
adjusting screws
of
is
increased
oil
to
<D
lubricate
by
in
tightening the
Fig.6 and de-
creased by loosening them.
ATTACHING THE NEEDLES
3.
(I)
DP
x 5
or
DP
x 7 needles must be
used for this model.
(2) Insert 2 needles fully
clamp in such a manner
into
as
their long grooves face with each
the
clamp screws.
rT
<f)
<D
...
I
"''I
,,.J
i•"
,~
...
,
:
.....
,
)/
: I
'
'
!'C
Y.
: H
I I :
I '
I 1
I
I
I
Fig.
of
threads
·~
7
than
can
r
4.
TWIST OF THREADS (Fig.8)
We
recommend you
Z-twist thread (right twist)
thicker threads
twist
Needle size Thread size
No.I I
No.l4
No.16
No.l8
to
use a S-twist (left twist) thread ® for the left needle and a
® for the right needle. If not, loosely twisted threads or
No.30 may be frequently broken
be used for
the
sew-
the needle
to make
other
the
bobbin thread.
as
shown
No.80
No.60
No.40
No.30
in
Fig. 7 and securely tighten with
Sewing material
to
No.lOO
to
No.80
to
No.60
to
No.20
at
Calico
weight, broad
Calico, Gabardine
of
light weight
Woolen fabric,
Gabardine
Vinyl-leather
the left hand needle. Either
of
--
light
cloth
®
Fig.
8
- 6
--
Loading...