Juki LK-1850 User Manual
UUKI
LK-1850 SERIES
No.
1983.7
IV-19
High-Speed
ENGINEER'S
1-Needle
Bar
Tacking
Cylinder
Machines
MANUAL
Bed
Lockstitch
k
19
TOKYO
FOREIGN
JOKI
INOUSTRIAL
TRADE
BUSINESS
CO.,
DIV.
LTD
PREFACE
This Engineer's Manual is written
maintenance
The
Instruction
a
garment
Adjustment",
is
not
coveredbythe
It is advisabletouse
Manual
when
of
the
machine.
Book
for
factory
contains
"HowtoAdjust",
Instruction
the
carrying
out
the
machine
detailed
relevant
the
maintenanceofthe
for
technical personnel
intended
operating
"EffectsofAdjustment",
Book.
Instruction
for
the
instructions.
Book
and
machine.
who
are responsible for
the
service and
maintenance personnel and operators at
This
and
various
Parts Book
manual
together
other
describes
information
with
this Engineer's
"Standard
which
CONTENTS
1.
SPECIFICATIONS
2. CAUTION IN RUNNING THE MACHINE BY HAND 2
3.
STANDARD ADJUSTMENT
4.
STANDARD
(1)
Height
(2) Adjustment of the feed cam 3
(3) Position of the stop-motion hook 5
(4) Stop-motion timing 5
(5) Adjustment of the changing pulley pressingplate 7
(6) Adjustment of the starting leverstopper 7
(7) Adjustment of the safety plate g
(8)
Position
(9)
Height
(10)
Position
(11)
Adjustment
(12)
Positionofthe
(13)
Adjustmentofthe
1)
2)
3)
4)
5)
(14)
Lateral
(15)
Adjustmentofthe
(16)
Positionofthe
(17)
Height of
(18)
Tiltofthe
(19)
Adjustmentofthe
(20)
Adjustmentofthe
(21)
Adjustmentofthe
(22)
Adjustmentofthe
5.
OTHER
(1)
Configurationofthe
(2)
Howtoremove
(3)
Howtoremove
(4)
Howtoremove
(5) How to remove
6. DISASSEMBLING & ASSEMBLING
(1)
Disassembling
(2)
Disassembling
(3)
Disassembling
(4)
Disassembling
(5)
Disassembling
(6)
Disassembling
(7)
Assembling
7. PARTS TO BE FIXED
8. PARTS TO BE FILLED
9.
EXPENDABLE
(1)
General
(2) Expendable PartsTo Be
(3) Parts
10. PARTS FOR
(1) Parts For
(2)
Special
(3) Modifying The Standard
11,
TROUBLES
ADJUSTMENT
of the
needle
ofthe work
ofthe
work
ofthe
ofthe
Timingofthe
Timingofthe
Clearance
Clearance
Clearance
between
between
between
positionofthe
the
moving knife and
counter
PRECAUTIONS
the
the
the
the
the
the
the
PARTS
ExpendableParts
Likely
To Be LostOr
SUBCLASS
Changing
Partsand
AND
CORRECTIVE
wiper
shuttle
moving
the
the
the
the
pedal pressure decreasing unit
FLOWCHART
bar 3
clamp
foot g
clamp
foot
tension
timing
needle
release
race
between
bar
spring
bar
the
needle
and
the
shuttle
shuttle
the
needle
and
the
shuttle
driver
the
needle
and
the
pointofthe
the
needle
and
the
shuttle
work
clamp
foot
auxiliary knife driving
knife
and
the
the
knife
blade
lengthofthread
thread
take-up
belt
tension
bobbin
winder
shuttle
race
ring
backlashofthe
backlashofthe
backlash
backlash of
shuttle
main shaft
speed reducer
high speed pulley (asm)
changing pulley •
low-speed pulley
WITH
WITH
MACHINES
The Numberof Stitches
Devices
between
the
PROCEDURES
driver
shaft
LOCKTITE
GREASE
Replaced
Damaged
Machine
To Subclass
cam
counter
counter
knife
knife
remainingonthe
spring
shuttle
feed bracket
Infrequently
main
the
During
driver
shaft
worm
Repair
Machine
shuttle
race
needle
shaft
and
the
AND
PRECAUTIONS
worm
gear
MEASURES
41
42
44
44
44
44
45
45
45
46
47
@
11
H
13
13
1g
1g
1g
1g
1g
15
iy
ig
19
2i
2i
23
23
25
25
25
25
27
27
29
2g
29
31
33
33
33
35
1
3
1.
SPECIFICATIONS
Description
Model
AppUcation
Sewing
speed
(spm)
Max.
(cotton thread)
Normal
(synthetic thread)
Stitch diagram
Numberofstitches
Bartacking
mdth
(mm)
Bartacking length (mm)
Needle
lift
of piesserfoot (mm)
* The following specifications are
NeetOe
bar
stroke
Thread take-up
Shuttle
race
Adjustmentof bartacking
width & length
Thread trimmingsystem
Liftingsystem
Wiper
Bobbin
winder
Drivingsystem
Safety device
Lubrication
Motor
Weight(kg)
Standard
LK-1850
Laig(>size
bartacking
2300
1800
LK-1852-5
Large-size
bartacking
2300
1800
LK-1854-10
Attaching
belt
'wmm
42
1.5
~3
8~I6
DPx5
#14.
#16
Max.
17
commontoboth
41.2
link-type thread take-up
Half-rotary shuttle race
(lubricatedthroughoilwick)
Byfeedregulator lever(fixed by nut)
Threadspreader: Interlocked with main shaft,
Thread
trimmer:
One-pedal
Two-pedal
system: Pedal
system:
Interlocked
Driven by belt
2-stage
Vbelt speed reducingsystem
One-pedaldouble safety device
Lubricating oil: Juki New Defrix Oil No. 2
System: By centralized oil wick and
greasefilling
2()0W
(single-or 3-phase)
42.5
28
1.5-3
8-16
DPx5
#14,#16
Max.
17
the
standard
Interlocked
pressure
unit (Standard)
Forfoot-treadle type P
(option)
with
lifter
and
6.5~14
(Standard
#14.
subclass
with
decreasing
2300
1800
DPx5
Max.
lifter
loops
21
0
#16
17
models.
14)
LK-1852-20
Attaching
belt
2300
1800
28
0
6.5
~ 14
(Standard
DPx5
#14,#16
Max.
Subclass
LK-185
loops
28
17
14)
Attaching
belt loops
2300
1800
28
0
13-25
(Standard
DPx5
#14.#16
Max.
2-30
17
25)
LK-1854-40
Attaching
belt
loops
2300
1800
1
42
42
0
18-35
(Standard
DPx5
#14.
Max.
#16
LK-1854-6
Knit
goods
bartacking
2300
1800
21
1.3-3
(Standard
2.5)
25)
17
4-8
(Standard
DP X5
Max.
6.5)
#11
17
(Cautions)
1) A
madiina
for attaching belt loops is to be installed
Refer to the figure at right and the table drawing on the last page
of this manual for installing the pedal shaft supplied with the
machine.
2) See the
3) Motorpulleyand belt (Theasterisked partsare
clamp
foot
LK-1854-10
following
table for proper use of the feed plate and work
according to belt loop length.
LK-1852-20 (Standard)
LK-1852-30
LK-l 854-40 (Standard)
LK-185440
(25 mm or more)
Frequency Sewingspeed
2300 spm *
50
Hz
2000 spm
1800 spm
2300 spm
60
Hz
2000 ispm
1800
spm
Part
Part
Part
Part
Part
*
*
*
Feed plate
No.
13543608
No.
13543608
No.
13545504
No.
13545504
No.
13547005
Motorpulley
13531108
13531207
13531306
13531405
13531504
13531603
(For
(For
(For
(For
Part
cotton
cotton
cotton
cotton
Work
Part
Part
Part
Part
Part
available
No.
thread)
thread)
thread)
thread)
LK-1852-3
Knit
goods
bartacking
2300
1800
28
1.3-3
(Standard
2.5)
4-8
(Standard
6.5)
DP X5
#11
Max.
17
sideways.
damp
foot
No.
13544408
No.
13544408
No.
13545603
No.
13545603
No.
13547104
on specialorders)
Numerical
m A A A 4
"i V V V vx
(Standard
(Standard
50-2300
50-2000
50-1800
60-2300
60-2000
60
1800
LK-1854-4
Buttonhole
bartacking
2300
1800
21
1.5-3
4-8
DPx5
#14.#16
Max.
mark
WWWV^
2.5)
(Standard
8)
17
Starting
(Viewed
from
High-speedV belt
• MTJVM005000
* MTJVM004900
MTJVM004800
•
MTJVM004900
•
MTJVM004800
MTJVM004700
LK-1852-1
Buttonhole
bartacking
2300
1800
28
1.5
4-8
(Standard
DPx
#14,
Max.
pedal
table
- 3
#16
5
17
2.5)
8)
Edge of
shaft
Starting
bottom)
(50")
(49")
(48")
(49")
(48")
(47")
LK-1854-11
Small-size
bartacking
2300
1800
21
TA
A A A S
kwwi
21
1.5-3
(Standard
4-8
(Standard
DPx
#14.#16
Max.
table
Motor
,
|
pedal
Fig. I
Low-speed V
MTJVM004600
MTJVM004600
2.5)
8)
5
17
in
Opening
/'
[ ' |
lever
46"
46"
LK-1852-2
Small-size
bartacking
2300
1800
bUUUUUVAl
riVVVVVV^
28
1.5-3
(Standrd
2.5)
4-8
(Standard
8)
DPx
5
#14.#16
Max.
17
forbelt
J |
belt
3.
STANDARD
Adjustment
stop-motion
Positioning the
stop-motion
Adjusting
stop-motion
Adjusting the
safety plate
(Note)
ADJUSTMENT
FLOW
CHART
Standard Adjustment Flow Chart
of
mechanism
hook
the
timing
The
solid
and the broken lines with arrows ( -•) represent the need for
readjustment
Adjusting
chan^ng pulley
pressing
Adjusting
lever stopper
lines
with
when
Adjustment
speed reducer
arrows
independent
of
the
plate
the
starting
( , ,
adjustment
Adjustingofpedal
pressure decreasing
Removing the pedal
pressure
unit
Installing the pedal
pressure decreasing
unit
) show
standard
has
decreasing
adjustment flow.
been
made.
Adjustmentofclamp
unit
foot lifting mechanism
Positioning the
work
Adjusting the height
of
the
foot
clamp
work
foot
clamp
Adjustment
bartacking functions
Adjusting the lower deat
pointofthe
Adjusting the feed cam
Adjusting the
race
spring
Adjusting
the
and
shuttle
driver
Adjusting the right
and left work clamp
feet
Adjusting
the
knife driving cam
Adjusting the moving
and
counter
Adjusting the
of thread remaining
on
the
needle
Adjusting
the
of the thread take-up
spring
Adjusting the
U.
ing width and length
needle
shuttle
needle
auxiliary
knives
length
tension
bartack
of
bar
Other
adjustments
t-
Positioning
Adjusting
release
Adjusting the belt
tension
Adjusting the bobbin
thread
bar
winder
the
the
wiper
teiuion
@
4.
STANDARD
ADJUSTMENT
(1) Heightofthe
Standard
needle bar
Adjustment
The upper marker lineengraved on the needle bar should be flush with the bottom end of the lower
needle bar bushing when the needle bar is at the lowest point of its stroke.
(Note) Perform this
adjustment
first
before
Needle
Needle
Upper
making
bar
bar
marker
any
bushing
line
other
(lower)
adjustment.
&>—
E3
Fig. 3
(2)
Adjustmentofthe
Adjustment should be made so
feed cam
that
the
feed is completed when the needle point
is 7 to 10 mm
the
throat
(9/32"~25/64")
plate surface.
above
(It is advisable to make this adjustment
during lateral feed). ^ ~ 10%
(9/32"~25/64")
Fig. 4
Fig. 5
-3-
HowtoAdjust
EffectsofAdjustment
1) Turn the drivingpulley by hand until the needle bar reaches the
lowest point of its stroke.
2) Remove the rubber plug from the face plate.
3)
Loosen
make the adjustment.
4)
After
setscrew
adjustment,
(T),and
securely
move
tighten
the
needle
setscrew
barupor
(T)
.
down
to
• Improper adjustment willcause
stitch skipping or thread breakage.
Loosen
nut
(T)
andthen cam
guide
pin .
This
will
allow
feed
cam (3) to be movedin the direction of rotation for adjustment.
• When the feed cam is turned in direction A, the feed timing
advances.
• When the feed cam is
delayed.
turned
in direction B, the feed timing is
%
(Caution)
Perform this adjustment first after
the
needle bar. Make suretoreadjust
whenever
the
feed
cam
has
been
®
the
adjustment of
stop-motion
adjusted.
Fig.
6
the
height of
regulating cam
Whenit is adjusted to 7 mm
(9/32")
stitches
Whenit is adjusted to 10 mm
(25/64") or so, protrusion of
the
onto
be prevented when sewing
a synthetic thread.
or so, well-tensed
will
result.
first
stitch
needle
the
material
thread
surface
will
with
-4-
(Note)
Strictly follow
the
orderofadjustment
Standard
Adjustment
for (3) through (6) shown below.
(3) Positionofthe
stop-motion
hook
Perfonn adjustment so that a 3 mm (1/8") clearanceis provided between the stop-motion hook and the
stop-motion cam when the machine runs at a low speed.
Knife
driving
Stop-motion
regulating
Stop-motion
cam
cam
roller
regulating
Stop-motion
hook
'Wl
cam
'3
0.7
~ 1. 2 %
Stop-motion
,Knife driving
cam
%
Driving
plate
Thread
trimmer
Fig, 7
0-0.
Fig. 9
5%
returning
(1/64")
roller
Fig. 8
3/64")
cam
roller
(4) Stop-motion timing
Performadjustment to make the stop-motion regulating cam rollerdrop from the low-speed point of the
stop-motion regulatingcamonto the stop motion point at the moment the top surface of the stop-motion
hook
aligns
withthe centerofthe
12.
Screw
No.
1
Stop-motion hook Stop-motion cam
screw
No.
1on the
stop-motion
cam
at the laststitchas
Stop-motion
showninFig.
regulating
cam
£
Fig. 12
Stop-motion
Fig. 13
regulating
roller
cam
-5
-
1)
Turn
the
main
(low-speed running)
2)
Remove
3)
Loosen
clearance
cam.
(Caution)
When
sticking.
the
screw
between
tightening
Fig. 10
HowtoAdjust
shaftbyhandto obtainthestate
spring
(2)
and
spring
(D .
(T),
and
perform
adjustmenttoallowa3mm
thestop-motion hook andthe
screw
(l),becareful
not to
showninFig.
cause
Fig. 11
knife
driving
excessive
(1/8")
axial
7.
EffectsofAdjustment
If the clearanceis adjusted to
3 mm (1/8") or less;
A
neutral
the machine runs at low speed,
causing the machine to idle and
stop.
state
Further,
will
result
when
the clearance
of
0.7 to 1.2 mm(45/64") ~
(3/64")
drivingcam and the knife driving
cam roller willgo at the time of
low-speedmachine running with
resultant striking noises. Also the
stop-motion
with the stop-motion
time of stop motion. (Fig. 8)
between the knife
cam
will interfere
hook
at the
If the clearanceis adjusted to
3 mm
(1/8")
or more;
The pressure of spring will
become too high when the machine
mns at high speed, often causing
the machine to idle and stop. It
may alsolead to inadequate torque
at the start of high-speedrunning
with consequent reduction in
sewing speed.
Also,the thread trimmer returning
roller
will
interfere
ing plate, resulting in thread
trimming failure, (clearance : 0
to 0.5 mm
(1/64"))
with
(Fig. 9)
the
driv
Loosen
three
setscrews
(D,
and
make
adjustment
within
the
slot.
• If later than screw No. 1;
The brake will
therefore a great stop-motion
shock
will
Also, it may cause
to stop at the first starting stitch.
• If earlier than screw No. 1;
The brake will work excessively,
causing a
If the timing is extremely
early, the stop motion will be
engaged one stitch earlier,
producing an abnormal sound.
result.
stop
not
work,
the
motion
machine
failure.
and
too
-6
Standard
Adjustment
(5) Adjustment of
The
clearanceAshouldbeequaltoclearance
(0.007")
0 2%
High-speed
pulley
the
changing pulley pressing plate.
Changing
fKTT
.
j
pulley
Low-speed
Bat the
pulley
time
ofstop
motion.
r\
B
^
0.4%
Fig. 14 Fig. 15
0.4'
(1/64")
(A=B=0.4mm(l/64"))
Changing
pressing
pulley
plate
(6)
Adjustmentofthe
starting lever
stopper
Bring the starting lever into contact with the stopper screw and make adjustment so that the starting lever,
hook
when pulled, will stop at the moment the clearance between the stop-motion
and the stop-motion
cam reaches3 mm (1/8") (refer to the previous clause(3)).
(1/8")
Stop-inotion
I /
Tobein
stopper
contact
screw
with
Starting
lever
Stop-motion
hook-
3%
tn
Fig. 16
Fig. 17
cam
-7-
HowtoAdjust
1)
Place
the stop-motion hook in the stop-motion position.
2)
Loosen
3)
Securely
Gradually
4)
nut
tighten
tighten
(T)
and
screw
screw
then
screw
(3).
untilequal
at A and B. (A = B= 0.4 mm (1/64"))
Q).
clearances
are
provided
EffectsofAdjustment
If A si larger than 0.4 mm
while B is smaller
Heat may be generated due to
than
the contact between low-speed
(1/64")
0.4;
pulley and the changing pulley,
or low-to-highspeed changing
feed timing may
with
the
motionofthe
bar, often causing the machine
to idle and stop.
Also, the machine may fail to
not
synchronize
needle
reach the high sewingspeed.
If
A is
smaller
than
0.4
mm
(1/64") while B is large than 0.4;
An inadequate torque may be
caused in low-speed operation, or
heat may generated due to the
contact between the changing
pulley and the high-speed pulley.
If A + B + C is larger than the
specified value;
The machine may stop at the time
when the sewing speed is changed
from low speed to high speed in
sewing extra heavy-weight material
or
the
like.
Push down the starting lever and make adjustment so that the
starting lever comes in contact with the stopper screw when the
clearance between the stop-motion
hook
and the stop-motion
cambecomes3 mm (1/8")(refer to (3) Position of the stop-motion
hook), then lock it using the nut.
If the adjusted value is larger than
3 mm (1/8"), the machine will be
put into idling state and stop at
the timeofstarting.
If the adjusted value is smaller
than 3 mm (1/8"), there will be
no
allowanceinthe
starting lever when the machine
runs at high speed, causing the
levertobind.
slotofthe
-8-
(7)
Adjustmentofthe
Adjust
the
(0.007"
3/32")
for B.
Safety
plate
safety
plate
~ 0.019")is
safety
andthe
provided
Work
Standard
plate
work
clamp
forA,anda
clamp
foot
Adjustment
foot
lever
longitudinal
lifting
lever
sothat a
lateral
clearanceof1.5
Down
clearance
to 2.5
@
!S!
of0.2 to 0.5
mm
(1/16"~
mm
Fig. 18
(8) Positionofthe
work
clamp
foot
Fig. 19
Tum the main shaft by hand and perform adjustment to equalize the both clearancesA between the needle
and the work clamp feet in the longitudinal feed.
Alsomake equal the both clearancesB between the feed plates and the work clamp feet.
Feed
bracket
Work
clamp
Feed
plate
foot
B B
Fig. 20
-9-
HowtoAdjust
EffectsofAdjustment
Loosen
setscrew
(T)tomake
adjustment.
After adjustment, securely tighten the setscrew.
If the clearance A is extremely
small, the work clamp foot will
notgoup.
If
the
clearance
B is
smaller
than
the specified value, the safety
plate and the work clamp foot
lifting lever will interfere with
each other, causing a stop motion
failure.
If
the
machine
clearance B is
can
zero,
notbestarted.
the
If the clearance Ais too large,
the wiper and the thread trimmer
willbe actuated before stop
motion, causing the wiper to
interfere
thread
threadtoremainonthe
with
the
needle,orthe
trimmertocut
the
needle
needle
too short with consequent slip
pageofthe thread from the needle
at stitching start.
1)
Loosen
foot
2)
Loosen
screw0and
within
the
screw0and
slotinthe
by the slot in the feed plate.
make
adjustmentofthe
feed
bracket.
adjust
the
position
ofthe
work
feed
clamp
plate
If
the
two
clearancesAare
not
equal, either work clamp foot
may
interfere
with
the
needle,
leading to needle breakage during
longitudinal feed.
-10-
Standard
Adjustment
(9) Heightofthe
work
clamp
feet
Remove the top cover, and adjust the height of the work clamp feet by the screw located at the center of
the
frame.
The
L-shaped
maximum
wrench
lift ofthe work
clamp
feetis 17mm(43/64").
j/r^
r\
1 7
A
Fig. 21
(10) Positionofthe
wiper
The clearance between the wiper and the needle should be 1.5 mm (1/16") or more at the time
when the wiper passes by the needle point.
(The needleis in stationary state at the time of stop motion.)
o
1.5
(1/16")
j
;!
1
•czi
Fig. 22
-11
Height of
-
the
work
clamp
feet
HowtoAdjust
EffectsofAdjustment
Stop the machine with the work clamp feet up, and loosen screw
(D to
make
adjustment.
If the right and left work clamp feet are
further
adjustment
using
screw
@ .
not
levelled, perform
If the work clamp feet are too
high, they will interfere with the
wiper when the wiper is actuated.
If
screws
feed
bracket
@ aretoo
will
low,
interfere
the
with
the loweringshaft. (Point A)
Adjust the position of
the
wiperbyscrew
To move the wiper,
move
starting
up and down, and
pulley
(3) by
Be sure to bring the
stop-motion cam
contact
stop-motion
shown in Fig. 24 when
making this adjustment.
withAof
lever
hand.
hook
(T)
(2)
turn
into
the
.
as
Stop-motion
Fig. 23
hook stop-motion
cam
If
the
clearanceissmaller
than
1.5nun (1/16");
The wiper will interfere
needle point, resulting in needle
breakage or scratches on the
needle.
If the clearance is
much
with
larger
the
than 1.5 mm(1/16"), the needle
clamp screw will hit the wiper
when
the
needle bar goes down.
Fig. 24
-12-
(11)
Adjustmentofthe
tension
Standard
release
Adjustment
bar
Tension
clamp feet up when the machine stops.
release
bar
(3)
should
L-shapedwrench
project4mm
(5/32")
Fig. 25
from
the
surfaceofsupporter
"g"
Tension
with
lever
the
work
(12) Position of the shuttle race spring
The
shuttle
shouldbepositioned
(Note)
Presence of any scrathes on area B may cause breakage of the bobbin thread. Grind and smooth
scratchesIfany.
race
spring
shouldbeevenly
longitudinally
positioned
sothat the
laterally
rear
edge
Fig. 26
with
ofthe
respect
needle
to the
aUgns
with
needle
corner
entry
Aas
point,
shown
out
and
below.
it
-
13
-
HowtoAdjust
EffectsofAdjustment
Withthe machine in stationary state, remove the top cover
and
the
face
cover,
and
loosen
screw
(T)tomake
adjustment
with the work clamp feet up.
If the projection of the tension
release
barissmaller
than4mm
(5/32"); The tension discswill be
left released during machine
operation. If the projection is
muchsmallerthan 4 mm (5/32"),
tension
off
release
bar (3) will come
supporter when the work
clamp feet begins to go up and
consequently the work clamp
feet fail to go up. Also, the
tension
discs
will
notbereleased.
If the projection of the tension
release bar is larger than 4 mm;
The end of tension
will
hit
the
face
cover
release
when
bar(3)
the
work clamp feet go up, producing
a
loud
noise. Also,
will
notbereleasedatthe
the
thread
time
of thread trimming, and as a
result,
the
needle
thread
will be
cut
extremely short.
Removethe feed bracket, feed plate and throat plate, then
perform
(Note)
The
bythe
adjustment
lateral
locking
using
positionofthe
positionofsetscrew
screw
shuttle
Fig. 27
(T)
.
race spring is
(^.
affected
also
Lateral or longitudinal deviation
of the shuttle race spring will
cause
the
needle
threadtobite
into
the
shuttle
race.
If the shuttle race spring is
positioned excessively in the
rear, the moving knife may fail to
catch
the
needle
thread.
-14-
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