Juki lk 1852 инструкция на русском

No. IV-19
1983.7
UUKI
LK-1850 SERIES
High-Speed 1-Needle Cylinder Bed Lockstitch
Bar Tacking Machines
ENGINEER'S MANUAL
19
k
TOKYO JOKI INOUSTRIAL CO., LTD
FOREIGN TRADE BUSINESS DIV.
From the library
of: Superior Sewing Machine & Supply LLC
PREFACE
This Engineer's Manual is written for technical personnel who are responsible for the service and
maintenance of the machine.
The Instruction Book for the machine intended for the maintenance personnel and operators at
a garment factory contains detailed operating instructions. This manual describes "Standard
Adjustment", "How to Adjust", "Effects of Adjustment", and various other information which
is not covered by the Instruction Book.
It is advisable to use the relevant Instruction Book and Parts Book together with this Engineer's
Manual when carrying out the maintenance of the machine.
From the library of: Superior Sewing Machine & Supply LLC
CONTENTS
1. SPECIFICATIONS
1
2. CAUTION IN RUNNING THE MACHINE BY HAND
2
3. STANDARD ADJUSTMENT FLOWCHART
@
4. STANDARD ADJUSTMENT
(1) Height of the needle bar
(2) Adjustment of the feed cam
(3) Position of the stop-motion hook
(4) Stop-motion timing
(5) Adjustment of the changing pulley pressing plate
(6) Adjustment of the starting leverstopper
(7) Adjustment of the safety plate
3
3
3
5
5
7
7
g
(8) Position of the workclamp foot
(9) Height of the work clamp foot
g
11
H
(10) Position of the wiper
(11) Adjustment ofthetension release bar
(12) Position ofthe shuttle race spring
13
13
1g
1g
1g
1g
(13) Adjustment ofthe timing between the needle and the shuttle
1) Timing ofthe needle bar
2) Timing ofthe shuttle
3) Clearance between the needle and the shuttle driver
4) Clearance between the needle and the point of the shuttle
1g
5) Clearance between the needle and the shuttle race
15
(14) Lateral position ofthe work clamp foot
(15) Adjustment of the auxiliary knife driving cam
(16) Position of the moving knife and the counter knife
(17) Height of the moving knife and the counter knife
(18) Tilt of the counter knife blade
(19)
(20)
(21)
(22)
iy
ig
19
Adjustment of the length of thread remaining on the needle
Adjustment of the thread take-up spring
Adjustment of the belt tension
Adjustment of the bobbin winder
2i
2i
23
23
5. OTHER PRECAUTIONS
(1)
(2)
(3)
(4)
25
Configuration of the shuttle race ring
How to remove the backlash ofthe shuttle driver shaft
How to remove the backlash of the main shaft
How to remove the backlash between the worm and the worm gear
25
25
25
27
(5) How to remove the backlash of the feed bracket
27
6. DISASSEMBLING & ASSEMBLING PROCEDURES AND PRECAUTIONS
(1) Disassembling the shuttle driver shaft
(2) Disassembling the main shaft
(3) Disassembling the speed reducer
(4) Disassembling the high speed pulley (asm)
(5) Disassembling the changing pulley
(6) Disassembling the low-speed pulley
(7) Assembling the pedal pressure decreasing unit
29
2g
29
31
•
33
33
33
35
7. PARTS TO BE FIXED WITH LOCKTITE
8. PARTS TO BE FILLED WITH GREASE
9. EXPENDABLE PARTS
(1) General Expendable Parts
(2) Expendable Parts To Be Replaced Infrequently
(3) Parts Likely To Be Lost Or Damaged During Repair
10. PARTS FOR SUBCLASS MACHINES
(1) Parts For Changing The Numberof Stitches
(2) Special Parts and Devices
(3) Modifying The Standard Machine To Subclass Machine
41
42
44
44
44
44
45
45
45
46
11,
TROUBLES AND CORRECTIVE MEASURES
From the library of: Superior Sewing Machine & Supply LLC
47
1. SPECIFICATIONS
Description
Standard
Subclass
Model
LK-1850
LK-1852-5
LK-1854-10
AppUcation
Laig(>size
bartacking
Large-size
bartacking
Attaching
belt loops
2300
2300
1800
1800
Sewing
speed
(spm)
Max.
(cotton thread)
Normal
(synthetic thread)
LK-1852-20
LK-185 2-30
LK-1854-40
LK-1854-6
LK-1852-3
LK-1854-4
LK-1852-1
LK-1854-11
Attaching
belt loops
Attaching
belt loops
Attaching
belt loops
Knit goods
bartacking
Knit goods
bartacking
Buttonhole
Buttonhole
Small-size
Small-size
bartacking
bartacking
bartacking
bartacking
2300
2300
2300
2300
2300
2300
2300
2300
2300
1800
1800
1800
1800
1800
1800
1800
1800
1800
LK-1852-2
2300
1800
1
Stitch diagram
'wmm
Number of stitches
Bartacking mdth (mm)
Bartacking length (mm)
Needle
lift of piesser foot (mm)
m
28
42
28
1.5 ~3
1.5-3
8-16
8~I6
21
0
6.5 ~ 14
(Standard 14)
42
28
28
42
0
0
0
6.5 ~ 14
13-25
(Standard 14)
21
(Standard 2.5)
18-35
(Standard 25)
DPx5
DPx5
DPx5
#14. #16
#14,#16
DPx5
DPx5
DPx5
#14. #16
#14,#16
#14.#16
#14. #16
Max. 17
Max. 17
Max. 17
Max. 17
Max. 17
Max. 17
WWWV^
21
28
1.3-3
1.5-3
(Standard 6.5)
(Standard 2.5)
(Standard 2.5)
1.5 -
TA
A
A
A
S
kwwi
bUUUUUVAl
riVVVVVV^
21
3
(Standard 2.5)
28
1.5-3
1.5-3
(Standard 2.5)
(Standrd 2.5)
4-8
4-8
4-8
(Standard 6.5)
4-8
(Standard 8)
(Standard 8)
4-8
(Standard 8)
(Standard 8)
4-8
(Standard 25)
"i V V V vx
28
1.3-3
21
A A A 4
DP X5 #11
DP X5 #11
Max. 17
Max. 17
DPx5
DPx 5
#14.#16
DPx 5
#14, #16
DPx 5
#14.#16
#14.#16
Max. 17
Max. 17
Max. 17
Max. 17
* The following specifications are common to both the standard and subclass models.
NeetOe bar stroke
Thread take-up
Shuttle race
41.2
(Cautions)
link-type thread take-up
1) A madiina for attaching belt loops is to be installed sideways.
Refer to the figure at right and the table drawing on the last page
Half-rotary shuttle race
(lubricated through oil wick)
Adjustment of bartacking
width & length
By feed regulator lever(fixed by nut)
Thread trimmingsystem
Thread spreader: Interlocked with main shaft,
machine.
Edge of table
2) See the following table for proper use of the feed plate and work
clamp foot according to belt loop length.
Feed plate
Thread trimmer: Interlocked with lifter
One-pedal system: Pedalpressure decreasing
LK-1854-10
Two-pedal system: For foot-treadle type P
(option)
Interlocked with lifter
Bobbin winder
Driven by belt
Drivingsystem
2-stage V belt speed reducingsystem
Part No. 13544408
LK-1852-20 (Standard)
Part No. 13543608
Part No. 13544408
LK-1852-30
Part No. 13545504
Part No. 13545603
LK-l 854-40 (Standard)
Part No. 13545504
Part No. 13545603
Part No. 13547005
Part No. 13547104
Motor
,
Starting pedal shaft |
Safety device
One-pedal double safety device
in Opening forbelt
/' [
'
Starting pedal lever J
(Viewed from table bottom)
LK-185440
(25 mm or more)
Fig. I
3) Motorpulleyand belt (Theasterisked parts are available on specialorders)
Frequency
Lubrication
Work damp foot
Part No. 13543608
unit (Standard)
Lifting system
Wiper
of this manual for installing the pedal shaft supplied with the
Sewing speed
Lubricating oil: Juki New Defrix Oil No. 2
System: By centralized oil wick and
grease filling
50 Hz
Motor pulley Part No.
Numerical mark
High-speedV belt
2300 spm
* 13531108 (For cotton thread)
50 - 2300
• MTJVM005000 (50")
2000 spm
* 13531207 (For cotton thread)
50 - 2000
* MTJVM004900 (49")
Motor
2()0W (single-or 3-phase)
1800 spm
50 - 1800
MTJVM004800 (48")
Weight (kg)
42.5
2300 spm
* 13531405 (For cotton thread)
60 - 2300
• MTJVM004900 (49")
2000 ispm
* 13531504 (For cotton thread)
60 - 2000
• MTJVM004800 (48")
60 Hz
13531306
From the library of: Superior Sewing Machine & Supply LLC
1800 spm
13531603
60
1800
MTJVM004700 (47")
Low-speed V belt
MTJVM004600
46"
MTJVM004600
46"
|
|
From the library of: Superior Sewing Machine & Supply LLC
3. STANDARD ADJUSTMENT FLOW CHART
Standard Adjustment Flow Chart
Adjustment of
stop-motion mechanism
Adjustment of
speed reducer
Adjusting of pedal
pressure decreasing unit
Adjustment of clamp
foot lifting mechanism
Adjustment of
bartacking functions
Other adjustments
Adjusting the lower deat
point of the needle bar
Removing the pedal
Adjusting the feed cam
pressure decreasing
unit
Positioning the
stop-motion hook
Adjusting the
stop-motion timing
Adjusting the
chan^ng pulley
pressing plate
Adjusting the starting
lever stopper
Installing the pedal
pressure decreasing
unit
Adjusting the
safety plate
Positioning the
work clamp foot
Adjusting the height
of the work clamp
t-
foot
Positioning the wiper
Adjusting the teiuion
release bar
Adjusting the shuttle
race spring
Adjusting the needle
and shuttle driver
Adjusting the right
and left work clamp
feet
Adjusting the auxiliary
knife driving cam
Adjusting the moving
and counter knives
Adjusting the length
of thread remaining
on the needle
Adjusting the tension
of the thread take-up
spring
Adjusting the belt
tension
(Note) The solid lines with arrows (
and the broken lines with arrows (
,) show standard adjustment
,
flow.
-•) represent the need for
U.
Adjusting the bartack
ing width and length
readjustment when independent adjustment has been made.
Adjusting the bobbin
thread winder
From the library of: Superior @Sewing Machine & Supply LLC
4. STANDARD ADJUSTMENT
Standard Adjustment
(1) Height of the needle bar
The upper marker line engraved 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 making any other adjustment.
Needle bar
Needle bar bushing (lower)
&>—
E3
Upper marker line
Fig. 4
Fig. 3
(2) Adjustment of the feed cam
Adjustment should be made so that the
feed is completed when the needle point
is 7 to 10 mm (9/32" ~ 25/64") above
the throat plate surface.
(It is advisable to make this adjustment
during lateral feed).
^ ~ 10%
(9/32" ~ 25/64")
Fig. 5
3From the library of: Superior-Sewing
Machine & Supply LLC
How to Adjust
Effects of Adjustment
1) Turn the driving pulley by hand until the needle bar reaches the
lowest point of its stroke.
2) Remove the rubber plug from the face plate.
• Improper adjustment will cause
stitch skipping or thread breakage.
3) Loosen setscrew (T), and move the needle barup or down to
make the adjustment.
4) After adjustment, securely tighten setscrew (T) .
Loosen nut (T) and then camguide pin
. This will allow feed
cam (3) to be moved in the direction of rotation for adjustment.
• When the feed cam is turned in direction A, the feed timing
advances.
• When the feed cam is turned in direction B, the feed timing is
delayed.
When it is adjusted to 7 mm
(9/32") or so, well-tensed
stitches will result.
When it is adjusted to 10 mm
(25/64") or so, protrusion of
the first stitch needle thread
onto the material surface will
be prevented when sewing with
a synthetic thread.
%
®
Fig. 6
(Caution)
Perform this adjustment first after the adjustment of the height of
the needle bar. Make sure to readjust stop-motion regulating cam
whenever the feed cam has been adjusted.
-4From the library of: Superior Sewing
Machine & Supply LLC
Standard Adjustment
(Note)
Strictly follow the order of adjustment for (3) through (6) shown below.
(3) Position of the stop-motion hook
Perfonn adjustment so that a 3 mm (1/8") clearance is provided between the stop-motion hook and the
stop-motion cam when the machine runs at a low speed.
Knife driving
cam
0.7 ~ 1. 2 %
Stop-motion
regulating cam
Stop-motion hook
3/64")
'3
Stop-motion regulating
Stop-motion cam
'Wl
,Knife driving
cam roller
cam roller
%
Driving plate
Thread trimmer
returning roller
Fig, 7
0-0. 5% (1/64")
Fig. 8
Fig. 9
(4) Stop-motion timing
Perform adjustment to make the stop-motion regulating cam roller drop from the low-speed point of the
stop-motion regulatingcam onto the stop motion point at the moment the top surface of the stop-motion
hook aligns with the center of the screw No. 1 on the stop-motion cam at the last stitch asshown in Fig.
12.
Stop-motion regulating cam roller
Screw No. 1
Stop-motion hook
Stop-motion cam
£
Fig. 12
Stop-motion regulating cam
Fig. 13
5 From the library of: Superior-Sewing
Machine & Supply LLC
How to Adjust
Effects of Adjustment
1) Turn the main shaftby hand to obtainthe stateshown in Fig. 7.
(low-speed running)
2) Remove the spring (2) and spring (D .
3) Loosen screw (T), and perform adjustment to allow a 3 mm (1/8")
clearance between the stop-motion hook and the knife driving
cam.
If the clearanceis adjusted to
3 mm (1/8") or less;
A neutral state will result when
the machine runs at low speed,
causing the machine to idle and
stop. Further, the clearance of
0.7 to 1.2 mm (45/64") ~
(Caution)
When tightening screw (l), be careful not to cause excessive axial
sticking.
(3/64") between the knife
driving cam and the knife driving
cam roller will go at the time of
low-speedmachine running with
resultant striking noises. Also the
stop-motion cam will interfere
with the stop-motion hook at the
time of stop motion. (Fig. 8)
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 also lead to inadequate torque
at the start of high-speed running
with consequent reduction in
sewing speed.
Also, the thread trimmer returning
roller will interfere with the driv
Fig. 10
Fig. 11
Loosen three setscrews (D , and make adjustment within the slot.
ing plate, resulting in thread
trimming failure, (clearance : 0
to 0.5 mm (1/64")) (Fig. 9)
• If later than screw No. 1;
The brake will not work, and
therefore a great stop-motion
shock will result.
Also, it may cause the machine
to stop at the first starting stitch.
• If earlier than screw No. 1;
The brake will work excessively,
causing a stop motion failure.
If the timing is extremely too
early, the stop motion will be
engaged one stitch earlier,
producing an abnormal sound.
-6
From the library of: Superior Sewing
Machine & Supply LLC
Standard Adjustment
(5) Adjustment of the changing pulley pressing plate.
Theclearance A should be equal to clearance B at the time of stop motion. (A = B= 0.4 mm(l/64"))
(0.007")
0 2%
.
Changing
pulley
j
Low-speed pulley
fKTT
r
Changing pulley
B
High-speed pulley
pressing plate
0.4'
^
0.4% (1/64")
Fig. 14
Fig. 15
(6) Adjustment of the starting lever stopper
Bring the starting lever into contact with the stopper screw and make adjustment so that the starting lever,
when pulled, will stop at the moment the clearance between the stop-motion hook and the stop-motion
cam reaches 3 mm (1/8") (refer to the previous clause (3)).
Stop-inotion cam
Starting lever
3% (1/8") I /
Stop-motion hook-
tn
To be in contact with
stopper screw
Fig. 16
Fig. 17
7From the library of: Superior-Sewing
Machine & Supply LLC
How to Adjust
Effects of Adjustment
1) Place the stop-motion hook in the stop-motion position.
If A si larger than 0.4 mm (1/64")
2) Loosen nut (T) and then screw Q) .
while B is smaller than 0.4;
3) Securely tighten screw (3).
until equalclearances are provided
4) Gradually tightenscrew
at A and B. (A = B = 0.4 mm (1/64"))
Heat may be generated due to
the contact between low-speed
pulley and the changing pulley,
or low-to-high speed changing
feed timing may not synchronize
with the motion of the needle
bar, often causing the machine
to idle and stop.
Also, the machine may fail to
reach the high sewing speed.
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
cam becomes 3 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 time of starting.
If the adjusted value is smaller
than 3 mm (1/8"), there will be
no allowance in the slot of the
starting lever when the machine
runs at high speed, causing the
lever to bind.
8From the library of: Superior -Sewing
Machine & Supply LLC
Standard Adjustment
(7) Adjustment of the safety plate
Adjust the safety plate and the work clamp foot lever so that a lateral clearance of 0.2 to 0.5 mm
(0.007" ~ 0.019")is provided for A,anda longitudinal clearance of 1.5 to 2.5 mm (1/16" ~
3/32") for B.
Work clamp foot lifting lever
@
Safety plate
!S!
Down
Fig. 19
Fig. 18
(8) Position of the work clamp foot
Tum the main shaft by hand and perform adjustment to equalize the both clearances A between the needle
and the work clamp feet in the longitudinal feed.
Also make equal the both clearances B between the feed plates and the work clamp feet.
Feed bracket
Work clamp foot
Feed plate
B
B
Fig. 20
9From the library of: Superior-Sewing
Machine & Supply LLC
How to Adjust
Loosen setscrew (T) to make adjustment.
After adjustment, securely tighten the setscrew.
Effects of Adjustment
If the clearance A is extremely
small, the work clamp foot will
not go up.
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 clearance B is zero, the
machine can not be started.
If the clearance A is too large,
the wiper and the thread trimmer
will be actuated before stop
motion, causing the wiper to
interfere with the needle, or the
thread trimmer to cut the needle
thread to remain on the needle
too short with consequent slip
page of the thread from the needle
at stitching start.
1) Loosen screw 0 and make adjustment of the work clamp
foot within the slot in the feed bracket.
2) Loosen screw 0 and adjust the position of the feed plate
by the slot in the feed plate.
If the two clearances A are not
equal, either work clamp foot
may interfere with the needle,
leading to needle breakage during
longitudinal feed.
0From the library of: Superior- 1Sewing
Machine & Supply LLC
Standard Adjustment
(9) Height of the 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 maximum lift of the workclamp feet is 17 mm(43/64").
L-shaped wrench
j/r^
r
A
1 7
Fig. 21
(10) Position of the 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 needle is in stationary state at the time of stop motion.)
o
1.5 (1/16")
j
;!
•czi
1
Height of the work clamp feet
Fig. 22
From the library of: Superior-11
Sewing
Machine & Supply LLC
How to Adjust
Effects of Adjustment
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 not levelled, perform
further adjustment using screw @ .
If the work clamp feet are too
high, they will interfere with the
wiper when the wiper is actuated.
If screws @ aretoo low, the
feed bracket will interfere with
the lowering shaft. (Point A)
Adjust the position of
If the clearance is smaller than
the wiper by screw (T) .
1.5 nun (1/16");
To move the
up and down, and turn
The wiper will interfere with the
needle point, resulting in needle
breakage or scratches on the
pulley (3) by hand.
needle.
Be sure to bring the
stop-motion cam into
If the clearance is much larger
contact with A of the
clamp screw will hit the wiper
when the needle bar goes down.
wiper,
move starting lever (2)
stop-motion hook as
shown in Fig. 24 when
making this adjustment.
than 1.5 mm (1/16"), the needle
Fig. 23
Stop-motion hook
stop-motion cam
Fig. 24
12From the library of: Superior-Sewing
Machine & Supply LLC
Standard Adjustment
(11) Adjustment of the tension release bar
Tension release bar (3) should project 4 mm (5/32") from thesurface of supporter
with the work
clamp feet up when the machine stops.
L-shapedwrench
"g"
Tension lever
Fig. 25
(12) Position of the shuttle race spring
The shuttle race spring should beevenly positioned laterally with respect to theneedle entry point, and it
should be positioned longitudinally so that the rear edge of the needle aUgns withcorner A asshown below.
(Note)
Presence of any scrathes on area B may cause breakage of the bobbin thread. Grind and smooth out
scratches If any.
Fig. 26
13 From the library of: Superior- Sewing
Machine & Supply LLC
How to Adjust
Effects of Adjustment
With the machine in stationary state, remove the top cover
If the projection of the tension
and the face cover, and loosen screw (T) to make adjustment
release bar is smaller than 4 mm
with the work clamp feet up.
(5/32"); The tension discs will be
left released during machine
operation. If the projection is
much smallerthan 4 mm (5/32"),
tension release bar (3) will come
off 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 not be released.
If the projection of the tension
release bar is larger than 4 mm;
The end of tension release bar (3)
will hit the face cover when the
work clamp feet go up, producing
a loud noise. Also, the thread
will not be released at the time
of thread trimming, and as a
result, the needle thread will be
cut extremely short.
Remove the feed bracket, feed plate and throat plate, then
perform adjustment using screw (T) .
Lateral or longitudinal deviation
of the shuttle race spring will
(Note)
cause the needle thread to bite
The lateral position of the shuttle race spring is affected also
into the shuttle race.
by the locking position of setscrew (^.
If the shuttle race spring is
positioned excessively in the
rear, the moving knife may fail to
catch the needle thread.
Fig. 27
14From the library of: Superior -Sewing
Machine & Supply LLC
Standard Adjustment
(13) Adjustment of the timing between the needle and the shuttle
1) Timing of the needle bar
The needle bar goesup from the lowest point of its stroke until the lower marker line engraved on the
needle bar is flush with the bottom end of the needle bar bushing (lower). (Fig. 28)
2) Timing of the shuttle
When the state is as described in the above 1), the center of the needle coincides with the point of the
shuttle at A. (Fig. 29)
3) Clearance between the needle and the shuttle driver
When the state is as described in the above 2), there should be no clearance between the needle and the
shuttle driver. (Fig. 30)
4) Clearance between the needle and the point of the shuttle
When the state is as described in 2), the clearance B between the needle and the point of the shuttle
should be 0.05 to 0.1 mm (0.001" ~ 0.004")- (Fig- 31)
5) Clearance between the needle arid the shuttle race
The clearance between the side face of the needle and the shuttle race should be 7.5 mm(19/64"). (Fig. 32)
1) Timing of the needle bar
2) Timing of the shuttle
Shuttle
Needle bar
Needle bar bushing (lower)
'0
Fig. 29
Lower marker line
Fig. 28
0.3-0.5%
(0.011"-0.019")
3) Clearance between the needle and
4) Clearance between the needle and
the point of the shuttle
the shuttle driver
Shuttle driver
Fig. 30
CD
5) Clearance between the needle
0.0 5-0.1%
(0.001"-0.003")
© (D
and the shuttle race
Fig. 31
7.5 % (19/64")
Shuttle race
Fig. 32
15From the library of: Superior Sewing
Machine & Supply LLC
How to Adjust
Effects of Adjustment
1) Referring to Standard Adjustment (1) Height of the needle bar,
1) and 2) Slightly reduce the height
of the needle bar (upper marker
make the lower marker line engraved on the needle bar flush
with the bottom end of the bushing.
line) for floppy material, and on
the contrary, slightly increase the
height for heavy-weight material
to adjust the timing of the
2) and 3) Loosen setscrew 0 of the shuttle driver, and adjust
the rotational and longitudinal directions of the shuttle driver.
(Caution)
Ensure to turn the shuttle in the arrowed direction as shown in
shuttle.
Fig. 29 when adjusting the timing of the shuttle.
4) Loosen setscrew (4) of the shuttle race, and turn eccentric
(For prevention of stitch skipping)
3) If the clearance is more than 0
shaft (D to make adjustment.
5) Loosen setscrew 0 to perform adjustment.
mm, the needle will be bent in
the direction of the shuttle point,
Enough care should be exercised when performing the
adjustment described in 4), namely the adjustment of the
clearance between the needle and the point of the shuttle.
causing scratches on the shuttle
point and the needle. On the
contrary, however, excessive
contact between the needle and
(Note)
The clearance in the rotational direction between the shuttle
and the shuttle driver should be 0.3 mm to 0.5 mm (0.011
the shuttle driver may cause
stitch skipping.
4) If the clearance is greater than
0.019") as shown in Fig. 29.
0.05 to 0.1 mm (0.001 ~ 0.003"),
Strike points C or D for adjustment.
After adjustment, check that point C is evenly spaced
vertically with respect to the shuttle.
stitch skipping will occur. If it is
smaller than the specifled values,
the needle strikes the shuttle point
and scratches occur, leading to
thread breakage or fine splits of
thread.
5) If the clearance is smaller than
7.5 mm (19/64") the needle
thread will not be fully spread,
often causing the needle thread
to bite into the shuttle.
•
If the clearance between the
shuttle drive and the shuttle is
greater than 0.3 to 0.5 mm
(0.011" ~ 0.019"), the shuttle
Fig. 33
noise will be louder. On the
contrary, if the clearance is not
enough, poorly tensed stitches
will result when sewing with a
thick thread.
16From the library of: Superior-Sewing
Machine & Supply LLC
Standard Adjustment
(14) Lateral position of the work clamp foot
The center of the work clamp foot should lie at the 26th stitch for 42-stitch large size bartacking, and at
the 18th stitch for 28-stitch large size bartacking.
26th stitch
(for 42-stitch large size
bartacking)
18th stitch
(for 28-stitch large size
bartacking)
Fig. 34
Fig. 35
(15) Adjustment of the auxiliary knife driving cam
The clearance between the end of the auxiliary knife driving cam and roller (D should be 0.3 to 0.5 mm
(0.0H"~ 0.019") when roller © fits in the recess of theknife driving cam.
Knife driving cam
Auxiliary knife driving cam
Changing pulley
Roller (2)
<S)
Roller @
0.3-0.5 % (0.0110.019")
(D
Fig. 36
7From the library of: Superior- 1Sewing
Machine & Supply LLC
How to Adjust
Loosen locknut (T) of the feed cam roller shaft,and move the roller
shaft in the arrowed directions for adjustment.
To conect slight deviation, loosen the lateral feed adjusting nut and
push the work clamp foot to the right or left to perform adjustment.
Effects of Adjustment
• Improperly positioned center of
the work clamp foot would cause
the needle to hit the work clamp
foot, leading to breakage of the
needle.
1) Push down the starting lever, and manually turn the driving
pulley to lower the work clamp foot.
2) Further push down the starting lever, and turn the changing
pulley in the arrowed direction until roller
fits in the recess
of the knife driving cam.
3) Loosen the setscrews,and make adjustment so that a clearance
of 0.3 to 0.5 mm (0.011"~ 0.019") is provided between the
end of the auxiliary knife driving cam and roller (3) when
roller
fits in the recess of the knife driving cam.
If the clearance is extremely
large, the thread trimming timing
will be delayed, resulting in
thread trimming failure.
If no clearance is allowed between
the end of the auxiliary knife
driving cam and roller (3), thread
trimming action will be inter
rupted at the time of thread
spreading with resultant thread
trimming failure.
18From the library of: Superior- Sewing
Machine & Supply LLC
Standard Adjustment
(16) Position of the moving knife and the counter knife
Position of the counter knife
Position of the moving knife
The clearance between the counter knife and the needle hole guide
should be 0.5 mm (0.019")The needle hole in the needle hole guide should meet the hole in the
moving knife at the time of stop motion (before the work clamp foot
goes up).
Counter knife
0.5%
(1/2")
Needle hole
guide
Moving knife
Moving knife link
Fig. 37
(17) Height of the moving knife and the counter knife
Moving knife :
Engagement of the needlehole guide with the moving knife blade
0.15 mm(0.005")
Counter knife : Difference between the needle hole guide and the counterknife blade in height
0.1 to 0.15 mm (0.003"~0.005")
Counter knife Moving knife
0.1-0.1 5%
(0.003"-0.005'
ylT' ) Tv (0.005")
f
r-w
1 u.i •
m
® Needle hole Throatplate
guide
Fig. 38
(18) Tilt of the counter knife blade
The counter knife blade surface should be tilted by 0.2 mm to evenly cut the two threads (needle thread
and bobbin thread).
Counter knife

0.5% -T
®
©
-r-0.2%
(1/2") t
t (0.007")
Fig. 39
9From the library of: Superior- 1Sewing
Machine & Supply LLC
How to Adjust
Effects of Adjustment
1) Positioning the counter knife
If the clearance is smaller than
Loosen setscrew (T), and adjust the position ofthe counter
knife.
2) Positioning the moving knife
0.5 mm (0.019"), the thread will
be trimmed by the blade point
of the counter knife when the
Loosen setscrew @ , and adjust the position of the moving
moving knife pulls the threads
and therefore the needle and
knife.
bobbin threads will be trimmed
too short.
(Note)
The normal operation of the knives Is such that the moving
knife passes by the Inside of the needle hole guide as shown
by A.
If the clearance is greater than
0.5 mm (0.019"), the thread
remaining on the fabric after
thread trimming will be longer.
If the moving knife is deflected
to the counter knife, the thread
trimmer will be actuated at the
time of stop motion, or the thread
spreader will fail to work properly,
resulting in thread trimming
failure.
If the moving knife is spaced too
much from the counter knife, the
thread trimming mechanism will
stick, causing thread trimming
failure, or the needle will strike
the moving knife, leading to
needle breakage.
1) Adjusting the height of the moving knife
Adjust the height of the movingknife according to the thickness
of washer (3) of Fig. 37. If proper adjustment of the moving
knife cannot be obtained, select and use one of the following
parts.
Insufficient difference in level
(specified value: 0.25 to 0.3 mm)
(0.009"~ 0.011") between the
moving knife and the counter knife
will lead to thread trimming failure.
Excessive difference in level
. Description
Thickness
B242328000A
Moving knife washer
B242328000B
Moving knife washer
0.5 m/m
B242328000C
Moving knife washer
0.6 m/m
(specified value: 0.1 to 0.15 mm)
(0.0030.005") between the
needle hole guide and the counter
knife will cause the blade point of
B242328000D
Moving knife washer
0.7 m/m
the counter knife to trim the
Part No.
0.4 m/m
2) Adjusting the height of the counter knife
Wrench portion @ using a screwdriver or thelike to make
adjustment.
threads when the moving knife
pulls the threads, and as a result,
the needle and bobbin threads
will be trimmed too short.
Shave side © if the thread onside (g) is not trimmed, or shave
side © if the thread on side © isnot trimmed.
(0.007"), the thread on side ©
(Caution)
will not be trimmed.
If the tilt is smaller than 0.2 mm
Make sure to form either side Into an angle smaller than 90
If the tilt is larger than 0.2 mm
degree when shaving sides © or ©.
(0.007") the thread on side ©
will not be trimmed.
JZL-O,
2
Acute angle
20From the library of: Superior -Sewing
Machine & Supply LLC
Standard Adjustment
(19) Adjustment of the length of the remaining needle thread
The lengthof the thread remaining on the needle after thread trimming shouldbe 35 to 40 mm (1-3/8'
1-37/64") from the needle eye.
In case of a synthetic thread, the remainingneedle thread should be longer than that of cotton thread.
Tension controller No. 1
N
Fig. 40
(20) Adjustment of the thread take-up spring
Stroke :
Should be adjusted so that the thread take-up spring moves approx. 8 mm (5/16") from
the horizontal of the L-shaped thread guide.
Tension : Make adjustment while checking the stitch performance.
(The proper tension is such that the thread take-up spring moves for the full stroke in actual
sewing operation.)
Thread take-up spring
a
Fig. 41
From the library of: Superior-21
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How to Adjust
Perform adjustment by the tension controller No. 1.
• As the tension controller No. 1 is turned in direction A, the
length of the remainingneedle thread will be reduced.
• As the tension controller No. 1 is turned in direction B, the
length will be increased.
(Caution)
Take care not to make the thread release timing too late for
Effects of Adjustment
Insufficient length of the remain
ing thread will cause the thread
to slip off the needle at sewing
start.
If the remaining thread is too
long, the needle thread will
protrude onto the material, or
thread trimming, otherwise the needle thread will be trimmed
clumsy wrong side of material
too short.
will result.
Refer to Standard Adjustment (11).
1) Adjusting the stroke.
If the stroke is greater than 8 mm
Loosening setscrew (T), insert a screwdriver into tension
controller No. 2 (2)to tum it for adjustment.
(5/16"), the thread remaining on
2) Adjusting the tension
First securely tighten the setscrew, then insert a screwdriver
into tension controller No. 2
to turn it for adjustment.
the thread will slip off the needle
at sewing start.
the needle will be too short, and
From the library of: Superior-Sewing
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22-
Standard Adjustment
(21) Adjustment of the belt tension
Both the high-speed belt and low-speed belt shouldslackabout 10 mm (25/64") when the middle
of the belts (the point shown by arrow) is pushed by a finger under an approx. 1 kg pressure.
Driving pulley
i
Idler puller
Motor pulley
Fig. 42
Fig. 43
(22) Adjustment of the bobbin winder
The clearance between the bobbin windingwheel and the V belt should be about 3 mm (1/8") when
the wheel is not winding a bobbin.
Brake
1
(D
Fig. 44
3% (1/8")
Vbelt
/
Winding belt support.
, Bobbin presser boss
0
:±]
_ r j III—i
Fig. 45
Fig. 46
From the library of: Superior-23
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Machine & Supply LLC
How to Adjust
Effects of Adjustment
1) Adjusting the high-speed belt tension
Adjust the tension of the high-speed belt first.
Loosen fixing screw (l) and nut
Excessive tension of the high
speed belt will prevent smooth
, and move up or down
the motor mounting base to make adjustment. When proper
belt tension has been obtained, tighten the screw and nut.
2) Adjusting the low-speed belt tension
Loosen screws Q) in the holes (three) of the driving pulley,
mn of the high-speed pulley with
consequent reduction in high
speed operation.
Inadequate tension will increase
idling vibration, and prevent the
and move the idlerpulley to the right and left to make adjustment.
When proper belt tensionhas been obtained, tighten the three
machine from reachinghigh speed,
screws.
stop.
1) Adjust the position of the V belt by moving the motor or the
motor pulley.
2) Perform adjustment byscrew @ so that the winding belt support
comes in light contact with the edge of the belt while a bobbin is
being wound.
causing the machine to idle and
If the clearance allowed is smaller
than 3 mm (1/8"), the belt will
touch the winding wheel and
wear out.
If the belt support fails to come
in light contact with the belt, the
winding speed will be low.
To be in light contact
3) If a bobbin is wound unevenly, loosen screw 0 and bend the
bobbin winder to the right or left.
M
Bend to the left.
Bend to the right.
4) To adjust the amount of thread to be wound round a bobbin,
loosen nut (2) and move back or forth the bobbin presser boss
to make adjustment.
24From the library of: Superior- Sewing
Machine & Supply LLC
5. OTHER PRECAUTIONS
Precautions
(1) Configuration of the shuttle race ring
If the shuttle point has been found worn out
severely, remove the shuttle race ring and check
whether the hatched portion on the rear side
measures 0.2 mm (0.007") x 8 mm (5/16").
8% (5/16")
0.2%
* n
r
(0.007")
Fig. 47
(2) How to remove the backlash of the shuttle driver shaft
Shuttle driver shaft
1 ^-t
Gear connection ^
Fig. 48
(3) How to remove the backlash of the main shaft
Screwdriver
0
Thrust collar
Fig. 49
5From the library of: Superior- 2Sewing
Machine & Supply LLC
Procedures
Remarks
If the hatched portion does not measure 0.2 mm (0.007") x
8 mm (5/16"), correct it usingan oil stone.
Removing the axial backlash
Loosen two setscrews (T) of the thrust collar, and tighten them
while pushing the shuttle driver shaft in the direction of arrow.
Removing the rotational backlash
Replace the gear connection by an appropriate one selected
among the followings.
o 13508353
Shuttle driver shaft gear connection (Y)
o 13509054
o 13509153
o 13509252
o 13509351
(0.2 smallerin dia.)
Shuttle driver shaft gear connection (Z)
(0.1 smallerin dia.)
Shuttle driver shaft gear connection (A)
(Standard)
Shuttle driver shaft gear connection (B)
(0.1 larger in dia.)
Shuttle driver shaft gear connection (C)
(0.2 larger in dia.)
• Tighten thrust setscrews (T) and
while twisting the crank
in the direction of arrow using a screwdriver or the like.
Setscrew (T) isthe first setscrew. Tighten it so thatit fits to
•
An axial backlash on the main
shaft would adversely affect the
speed reducer and the feed timing.
the fiat part of the main shaft.
• The proper play is 0.01 to 0.04 mm. (0.0003"~ 0.0015").
(Note)
Make sure to check the timing of the feed cam and the stopmotion cam after removing the backlash.
6From the library of: Superior- 2Sewing
Machine & Supply LLC
Precautions
(4) How to remove the backlash between the worm and worm gear.
Worm gear
Cam shaft
(D
Crank rod
Worm
Fig. 50
(5) How to remove the backlash of the feed bracket
Backlash of the feed cam roller (Fig. 74) or feed slide block (Figs. 73 and 74) would lead to lateral or
longitudinal backlash of the feed bracket.
27From the library of: Superior -Sewing
Machine & Supply LLC
Remarks
Procedure
1) Remove the top cover.
An excessive backlash would
2) Loosen four screws (T) •
adversely affect the feed timing.
3) Holding the cam shaft, turn the worm in the direction of arrow
with care taken not to disturb the timing between the main
shaft and the cam shaft. This will make the worm advance
toward the rear bushing of the main shaft, removing the
If no backlash is allowed, the
worm will get hot, and the main
shaft torque will increase, causing
stop motion failure or idling stop.
backlash.
4) After removing the backlash, securely tighten four screws (X).
(Note)
If the timing between the main shaft and the cam shaft has
been disturbed, readjust the stop motion timing and the feed
cam.
1) Replace the feed cam roller by one of the followings.
B250228000A
Feed cam roller
(69 5
B250228000B
Feed cam roller
09.5
B250228000C
Feed cam roller
09.5 _o.So5
+0.005
2) Replace the feed slide block by one of the followings.
13516604
Feed slide block
13516703
Feed slide block
13516802
Feed slide block
12
°
-0.009
+0.009
0
+0.018
+0.009
From the library of: Superior-Sewing
Machine & Supply LLC
28-
6. DISASSEMBLING & ASSEMBLING PROCEDURES AND PRECAUTIONS
Disassembling & Assembling Procedures
(1) Disassembling the shuttle driver shaft
1) Remove the pedal pressure
decreasing unit.
2) Loosen setscrew (T) , and
Thrust collar
remove the shuttle driver.
3) Loosen the two setscrews of
Shuttle driver
the thrust collar.
4) Loosen and remove the setscrew of the stop-motion
regulating arm B, and take
out the stop-motion regulat
ing arm B down from the
shaft. (See Fig. 72)
5) Draw out the shuttle driver
Fig. 51
shaft to the rear.
* Assemble them by reversing the above disassembling procedure
(2) Disassembling the main shaft
1) Remove the speed reducer.
2) Remove the needle.
3) Remove the stop-motion lever.
4) Loosen two setscrews (Dof
the counterweight and four
setscrews
DO
of the worm.
5) Loosen two setscrews (5) of
the crank rod, and remove
the crank rod cover.
6) Loosen and remove two set-
screws @ of the
thrust
collar.
7) Loosen and remove setscrew
0
of the main shaft rear
bushing.
8) Remove the thread take-up spring ( (3) in Fig. 11),and position the knife driving cam arm so that it
does not interfere with the rear end of the bushing.
9) Apply asbrass bar to point A, tap it to draw out the main shaft together with rear bushing (2).
* Assemble them by reversing the above disassembling procedure.
From the library of: Superior-29
Sewing Machine & Supply LLC
Precautions in disassembly
• When drawing out the shuttle driver shaft, never remove the
dowel pin from the shuttle driver shaft gear, or else the shuttle
drivershaft needle bearingwill be damaged.
Precautions in Assembly
• When reassembling the same
gears, put the mating faces of
the gears to their original
position to prevent loud gear
noise.
a
Dowel pm
• Be sure to use a soft metal such as a brass bar when tapping
point A.
At this time, remember to tap it gradually.
To assemble the main shaft, place
a covering piece on the end of
knife driving cam ©, and tap
it gradually using a brass bar or
the like to drive in the rear
bushing of the main shaft.
Securely fit the end of setscrew
© into the long groove of the
rear bushing of the main shaft,
and fit it.
From the library of: Superior-Sewing
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30-
Disassembling & Assembling Procedures
(3) Disassembling the speed reducer
1) Remove the presser plate of the changing pulley. (Fig. 15)
2) Loosen setscrews (D toremove ball bracket (2) .
3) Loosen setscrews (|) to remove washers @ and mounting disc (s) .
4) Remove low-speed pulley ®, adjusting shim (5) and pulley spacer (8) .
5) Loosen setscrew A and then setscrew B 0 (tapered screw) to remove low-speed pulley shaft (Q)
6) Remove changing pulley 0 and low-speed pulley spring © •
7) Loosen setscrew
, then loosen and remove setscrew (large) O (tapered screw) to remove high
speed pulley 0 .
* Assemble the unit by reversing the above disassembling procedure.
Fig. 53
From the library of: Superior-31
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Precautions in Disassembly
Note that setscrew B
is a tapered screws.
Low-speed pulley shaft O can be removed only by
loosening the screw, however, it is advisable to remove
the screw for easier assembly.
Precautions in Assembly
1) Attach d) sothattapered
screw O enters tapered hole
®.
2) Apply grease to the low-speed
pulley springs before attaching
them to (© .
3) Attach (Q) sothat tapered
screw 0 enters tapered hole
(g) in the main shaft. At this
time, be careful not to cause
springs 0
to interfere with
the flatheaded screws of the
changing pulley, and also not to
twist the pulley springs.
(Caution)
Take care not to overtighten 0
otherwise It would be difficult to
remove It later. (35 kg-cm)
Screw
4) The clearances between low-speed
pulley ®, changing pulley © ,
and high-speed pulley 0 should
be about 0.4 mm (0.015") each.
(Tieck that a contraction of about
1 mm is obtained when the part
shown by an arrow in the figure
below is pushed forcibly (0.2 mm
(0.007") -»• 0 mm). Perform this
adjustment by increasing or
decreasing the number of adjusting
shims (2) (0.1 mm (0.003")in
thickness).
* As the number of the adjusting
shims is increased, the clearances
will grow larger.
0.2 % (0.007")
uftfU
mmn
WA]
1 %C0.039")
mm Push here
JMLI
32From the library of: Superior Sewing
Machine & Supply LLC
Disassembling & Assembling Procedures
(4) Disassembling the high-speed pulley (asm)
1) By removing bearing snap ring (D first, then pulley spacer
and adjusting shim (D , high-speed
pulley (2) can be removed together with ball bearing snap ring 0, washer 0 and ball bearing 0
(Ball bearing 0 has been force-fitted.)
2) Remove preload spring 0 and pulley spacer 0 .
3) Loosen three screws O and © of the high-speed
cluth, and high-speed clutch @ can be removed
from stop-motion cam 0) .
4) Stop-motion cam pawl
and safety stopper
spring O can be removed by drawing out
stop-motion cam pin (0) .
(Stop-motion cam pin 0 is force-fitted.)
* Assemble the high-speed pulley (asm) by
reversing the above disassembling procedure.
<D
(5) Disassembling the changing pulley
1) Loosen and remove setscrew 0 ofthe changing
pulley.
2) Changing pulley shaft 0 comes offchanging
pulley (2).
Fig. 55
(6) Disassembling the low-speed pulley
1) Remove ball bearing snap ring 0 and then washer
2) Low-speed pulley @ and ball bearing @ are
force-fitted.
0
Fig. 56
From the library of: Superior-33
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Precautions in Disassembly
Precautions in Assembly
When taking ball bearing ® out from high-speed pulley (2),
remove snap ring {4) and washer (D, then push the inner
1) Apply grease to stop-motion cam
pin 16 before force-fitting it.
2) Apply a thin coat of grease to
ring in the direction of arrow.
surface ® of thestop-motion
cam.
3) Adjust the clearance between
high-speed clutch
and high
speed pulley (2) by increasing or
decreasing the number of adjusting
shim (D (0.1 mm (0.003") in
thickness).
* As the number of the adjusting
shims is increased, the clearance
will grow smaller.
4) To install ball bearing ®, apply
Adjusting shim
a thin coat of grease to the inner
ring, and push the outer ring to
force-fit it into the pulley. At this
time, take care not to produce
scratches on the end surface of
the high-speed pulley.
5) Of the three setscrews for the high
speed clutch, one setscrew O is
0.2 ±0.05-H
(0.007" ±0.002")
shorter than the rest. Use this
shorter screw for (§) stop-motion
cam O •
• Carefully remove setscrews (T) since they are fixed by
lock tite.
Apply lock tite to three setscrews
©.
When force-fitting the ball bearing,
take care not to produce any
scratches on the end surface of
the low-speed pulley.
4From the library of: Superior- 3Sewing
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Disassembling & Assembling Procedures
(7) Assembling the pedal pressure decreasing unit
1) Attach reverse rotation preventing latch @ and spring (D to mounting base 0 by hinge screw 0,
fix them by nut (5) .
2) Drive lowering shaft collar B 0) intoinput shaft 0) .
3) Fit clutch spring (5) onto pressure decreasing clutch latch 0 so that the end ofthe spring comes in
contact with the pin of the clutch latch.
4) Attaching screw 0 to thrust collar ® for sleeve, set them onto inner sleeve 0) . Then install them
so that the groove of the inner sleeve fits to the pin of the pressure decreasing clutch latch.
5) Apply Esso Temprex N3 to outer sleeve Cj) . and attach it sothatthe stopper pin of the outer sleeve
comes in contact with theend of clutch spring (j).
6) Apply Esso Temprex N3 to input shaft O , then attach needle bearings © and (Q) , and collar A O
to the input shaft.
7) Attach input shaft O to ball bearing @ , and fix it by snap ring © •
8) Attach outer sleeve guide ring (© to outer sleeve (Q) , then install the assembly including O
through (0 and the assembly comprising 0 through 0 .
O
From the library of: Superior-35
Sewing
Machine & Supply LLC
Precuations in Assembly
Precautions in Disassembly
1) Pay attention to the attaching direction when attaching the
reverse rotation preventing latch, spring, and hinge screw.
Use locktite to fix nut (?).
2) When driving collar B (01 into input shaft (Q) , make their
end surfaces flush with each other.
Flush
3) The clutch springshould be screwed onto the pressure
decreasingclutch latch so that the end of the spring comes
in contact with the stopper pin. However, be careful not to
screw the spring onto the latch excessively, otherwise the
spring will be deformed.
Apply Esso Temprex N3 to the circumference of the screw.
Pay attention to the orientation of the spring.
4)
• To remove the clutch spring,
draw it out while wrenching
point ® using a small screw
driver or the like. Do not
forcibly pull out the spring, or
the spring would be deformed.
Groove of the inner sleeve
Fin
End of the spring
5)
Bring the pin into contact with the end of the spring, and turn
the outer sleeve in the direction of arrow to attach it to the
inner sleeve.
36From the library of: Superior-Sewing
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Disassembling & Assembling Procedures
9) Install input shaft @ assembly to pressure decreasing unit frame, (from the direction of arrow A)
10) Attach idler mounting plate (3) to pressure decreasing unitframe (T) by setscrew (3).
11) Inserting pressure decreasing shaft
from direction B(shown byarrow), drive in dowel pin (^,
aligning the tapered hole of the shaft
with the tapered hole of the pressure
decreasing clutch latch (Fig. 57, ©).
12) Tighten setscrew (J).
13) Attach spring suspension
to work clamp foot lifting lever link (T).
14) Attach upper and lower work clamp foot lifting levers (D to work clamp foot lifting lever link ®
by hinge screw (3) .
15) Using setscrew A ® and setscrew B (5) , attach lever latch A ® and lever latch B @ to work
clamp foot lifting levers (§), respectively.
(D
®
Fig. 59
37From the library of: Superior Sewing
Machine & Supply LLC
Precuations in Assembly
6) When installing the input shaft to the pressure decreasing unit
frame, take care not to pinch reverse rotation preventing latch
Precuations in Disassembly
When taking out the dowel pin,
be careful not to hit it reversely,
or else the head would be crashed
and the dowel pin would not come
out.
7) The dowel pin is tapered, and therefore do not drive it in
reversely.
To draw out pressure decreasing
shaft (5), draw out the dowel
pin, loosen setscrew ® , and
tap the shaft from direction A.
8) Use lock tite to fix setscrews A 0 and B 0.
9) Apply grease to the partsof hinge screw (3) and spring
suspension 0 onto which the spring ishooked.
8From the library of: Superior- 3Sewing
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Disassembling & Assembling Procedures
16) Using hinge screw (3) and eccentric pin 0, attach work clamp foot lifting lever (asm) (2) topressure
decreasing unit frame 0 .
17) Fix eccentric pin 0 by setscrew 0.
18) Inserting stopper screw 0 into pressure decreasing unit frame 0 ,fix itusing nut 0 .
19) Attach tension spring (8) to the work clamp foot lifting lever.
20) Tighten sleeve thrust collar screw ((8) of Fig. 57).
©
@
Fig. 60
39From the library of: Superior -Sewing
Machine & Supply LLC
Precuations in Assembly
10)
11)
Precuations in Disassembly
Apply grease to hinge screw (3) and eccentric pin (§).
Make adjustment byeccentric pin (J) so that the end of
reverse rotation preventing latch
comes in contact
with the pressure decreasing clutch latch ((6) of Fig. 57)
by 1/4 to 3/4 when latch A of work clamp foot lifting
lever @ touches the stopper ofouter sleeve ( (Q) of
Fig. 57).
Reverse rotation
Outer sleeve
preventing latch
Pressure decreasing
clutch latch
In contact by
1/4 to 3/4
12) When the clutch spring ( ^ ofFig. 57) has been replaced
and the adjustment has been considerably disturbed,
replace the clutch springor cut the springend on the
pressure decreasing clutch latch ( ® ofFig. 57).
The reverse rotation preventinglatch should come in
contact with the pressure decreasing clutch by 1/4 to
3/4 at the point shown below.
Outer sleeve
13)
The clearance between outer sleeve ( O or Fig. 57)
andlatch A of work clamp foot lifting lever (g) should
be 0.5 mm (0.019").
Adjust the clearance by stopper screw ©.
I— Stopper screw
0.5% f
(0.019")
14) Fix the screw of the pressure decreasing sleeve collar in a
position where it does not touch points A when the outer
sleeve is turned with latch A of work clamp foot lifting
lever
in contact with the circumference of the outer
sleeve.
Screw
From the library of: Superior- 4Sewing
Machine & Supply LLC
0-
7. PARTS TO BE FIXED WITH LOCKTIGHT
Since a great number of starts andstops areexpected in operating thismachine, the screws that are likely to
loosen have been fixed with lock tite.
Accordingly, whenever these parts havebeen disassembled, clean them with thinner and dry well before
applying lock tite to them for reassembly.
If it is difficult to remove a screw fixed with lock tite, heat it with a torch lamp or the like.
The parts using lock tite that are usually disassembled are as shown below.
(3) Changing pulley
(2) Stop-motion lever
(1) Stop-motion lever shaft
• End of stop link rod
• End of the lever shaft
• Setscrews
Setscrews of changing pulley
Screw on the stop-motion
lever stud
Fig. 63
^—Stop-motion spring adjusting nut(large)
Fig. 61
i-motion spring adjusting nut (small)
Fig. 62
(4) Throat plate
• Knife driving lever stud
(5) Work clamp foot lifting lever
• Work clamp foot lifting lever latch
Setscrew(B)
(6) Shuttle driver shaft gear
• Gear dowel pin
Work clamp foot lifting
/
lever latch (A)
Dowel pin
Work clamp foot lifting
Setscrew®
Knife driving lever stud
Fig. 64
Fig. 66
[email protected]
Fig. 65
(Caution)
Lock tite is used for many hinge screws. Be very careful not to allow lock tite to stick to their shafts, or
else the functions of the parts may be damaged.
From the library of: Superior-41
Sewing
Machine & Supply LLC
8. PARTS TO BE FILLED WITH GREASE
(1) Refill grease once every other year or when the parts filled with grease have been disassembled.
(2) Grease to be used
Lithium-based grease
Description
Maker
Esso
Lithen 2,
Shell
Clvania
Use Esso Temprex N3 for the pedal
pressure decreasing unit components,
(supplied with the machine)
Beacon 2,
(3) Parts to be filled with grease
If a grease pump is not available, use a plastic oiler or an injector with its needle removed.
1) Main shaft components
2) Pedal pressure decreasing unit compoments
Hinge screw
Bushing (rear)
.411
1
Hinge screw
Inside of the pressure,
decreasing shaft
(Temprex N3)
•©
Bushing (middle)
Fig. 67
3) Speed reducer
4) Feed bracket components
Ball
Inside of the
main shaft
Inner ring of the bearing
Low-speed pulley springs
Sliding part of the changing pulley
Fig. 69
Fig. 70
2From the library of: Superior- 4Sewing
Machine & Supply LLC
6) Lowering lever and stop-motion connecting
5) Stop-motion lever components
lever components
Hinge screw of
lowering lever
Stop-motion hook
Inside of grease box
Stop-motion lever j
Hinge screws of stop-motion
connecting lever
leaf spring
Lowering roller
Inside of stop-motion(1^
lever shaft
Setscrew of
stop-motion
regulating arm (B)
Fig. 71
7) Longitudinal and lateral feed components
Inside of the regulating arm shaft
Fig. 72
Feed regulator shaft
Lateral feed slide block
Groove in feed plate
Pivot stud
Groove in lateral feed
regulator
I
Longitudinal feed slide block
Groove in longitudinal
feed driving arm
Feed cam roller
Longitudinal feed
driving arm stud
Lateral feed regulator stud
Fig. 74
Lateral feed driving arm shaft
Fig. 73
8) Knife driving cam components
Knife driving cam roller
Auxiliary knife driving roller
Lowering link lever pin
Fig. 75
From the library of: Superior-43
Sewing
Machine & Supply LLC
9. EXPENDABLE PARTS
(1) General expendable parts
Part No.
Description
Caution in installation
Needle
B1818280000
Shuttle
B24222800A0
Moving knife
Check that the clearance of 0.3(0.011") to 0.5 mm (0.019") is provided
between the shuttle and the shuttle driver. If not, correct it in
accordance with the pertinent "Standard Adjustment".
Select a proper washer for the moving
knife and perform adjustment so that
the moving knife blade engages with
the needle hole guide by 0.15 mm (0.005")
rs^
o
"
o
° 6.
B2424280000
Counter knife
Perform adjustment to provide a 0.1 (0.003")
to 0.15 mm (0.005") difference in level
between the counter knife blade and
m
—
7
> lo
to
o
) fo S
the needle hole guide.
"
o
o
oci
B2426280000
Needle hole guide
B3112761000
Thread take-up spring
B2303280000
Tension release pin
Replace this part if its needle hole has been scratched or grown
bigger in diameter. Whenever installing a new needle hole guide,
check the height of the moving and counter knives.
(2) Expendable parts to be replaced infrequently
Description
Caution in installation
13503750
High-speed clutch disc
Refer to 6. Disassembling/assembling procedures for replacement.
13504402
Changing pulley
Part No.
13504709
Low-speed pulley
B1215280000
Stop-motion cam latch
B1217280000
Stop-motion cam latch
driving spring
13520309
(Changing pulley pressing
plate
Replace this part when the portion in contact with the ball has been
depressed, scarcely providing no tilt.
13520408
Driving plate
Replace this part when point A has worn out
and the moving knife is allowed to move in
low-speed operation, producing tapping
sound.
f
13522206
13523808
)|
cam roller
Whenever replacing the roller, the snap ring RC0470611KP should
be also replaced with a new one.
Qutch spring
Refer to 6. Disassembling/assembling grocedures for replacement.
Stop-motion regulating
(3) Parts likely to be lost or damaged during repair
Part No.
B2549280000
Description
Balls (seven) for feed
bracket
SS1060210TP
Needle hole guide
setscrews (two)
B1253980000
Stop-motion ball
Caution in installation
Apply grease to these balls to prevent them from falling when
installing them.
Apply grease to the ball before installing it.
44From the library of: Superior Sewing
Machine & Supply LLC
10. PARTS FOR SUBCLASS MACHINES
(1) Parts for changing the number of stitches
Model
Worm gear
Worm
Stop-motion regulating cam
28
13510904
13510805
13538301
14
13510904
13510805
13539002
36
13511100
13511001
13538400
42
13510409
13510300
13522008
21
13510409
13510300
13539200
No. of stitches
LK-1852
LK-1853
LK-1854
(2) Special parts and devices
Application
For lifting the work
clamp foot by 2
pedals
For using two
pedals with a
Description
Foot-treadle type
Part No.
13545959
Remarks
How to install
lifter (for P)
Belt cover for P
13546809
machine table for
Pedal shaft (asm)
13547658
attaching belt loops
for P
Slot groove
Lowering lever
Lowering roller
Removing the pedal pressure decreasing unit, fit
the slot in the lowering lever on the backof the
lifter onto the lowering roller, and fix it using
three setscrews.
For long needle
(DPx 17,DIx3)
Needle bar
Needle bar thread
guide
For thick needle
(#19 or more)
D2101L7AM00
Shuttle
D1818282N00
Shuttle race ring
(for #23 needle)
D1817282N00
Needle hole guide
B242628000B
Needle hole guide
(with boss)
D2426L7AM00
Thread take-up
spring
D3112L4BB00
Tension spring
No. 2
For making shuttle
rotation angle
greater (for sewing
D1405L7AM00
Wiper
(without boss)
For thick thread
D1401L7VV00
Large oscillating
rock shaft
B3129053000
D1805MLBH00
canvas shoes)
For higher tension
of pressure spring
Spring
13519004
From the library of: Superior-45
Sewing
Machine & Supply LLC
(3) Modifying the standard machine to subclass machine (Follow the arrows shown below for modification.)
Modification within the same number of stitches
Modification within the same number of stitches
Parts to be replaced
Modification in which the number of stitches is changed
but with division
Parts to be replaced
Remarks
Feed cam
Parts to be replaced
Remarks
Feed cam
Remarks
Feed cam
Feed plage
Feed plate
Feed plate
Work clamp foot
(right)
Work clamp foot
Work clamp foot
(right)
Work clamp foot
Work clamp foot
(right)
aeft)
Oeft)
Stop-motion
regulating cam
Work clamp foot
(left)
Comes in two
Refer to the
types for same
paragraph cover
ing the stop-
number of
stitches with or
without division
motion reflating
Stop-motion
regulating cam
cam.
Exclusive cams
Refer to the
are available,
depending on
paragraph cover
ing the stop-
number of
stitches
cam.
Replace accord
ing to number of
Worm
stitches.
motion reflating
Refer to the
paragraphs cover
ing the worm and
worm gear.
Worm gear
Replace accord
ing to number
of stitches.
Refer to the
paragraphs cover
ing the worm and
worm gear.
0
Modified to subclass machine
Modification in which bartacking size is also changed
Condition ; Change from
standard machine
Bartacking size :
40mm
(lateral feed) x
20mm
(longitudinal feed)
Description
Feed pressing plate
Part No.
13519103
Modification in which the count of needle is also changed
Description
Needle hole guide
Shuttle race ring
Needle bar
Needle bm: thread
guide
Part No.
Count of needle
D2426282C00
#11 DPx5
B2426280000
#14 ~ #18 DP X5
B242628000B
#19 or more DP x 5
B1817280000
#ll'-#18DPx5
D1817282N00
#19 or more DP x 5
B1401L7W00
B1405L7VV00
DPxl7
#19 or more
DPx 17
# 19 or more
Remarks
Standard
Standard
For extra heavy
weight material
(canton flannel)
10 plies or more
From the library of: Superior Sewing Machine & Supply LLC
11. TROUBLES AND CORRECTIVE MEASURES
Trouble
Cause (1)
1. Tlie machine stops in the idling area
between losv-specd and high-speed
operation. (The machine stops at the
second or third stitch (idling area)
Cause (2)
Corrective measures
1-1) The pressing plate has been positioned
1 Correct the position of tlie prctsine plate. (Rcfci lo Standard Adjustment (5).)
improperly.
1 -2) Tlie starting lever is pulled down
excessivelyto the high-speed idling
after it is started.
2) - A Tlic starting lever stopper has been
Correct the position of the .startingicvetstopper. (Refer to Standard
positioned improperly.
Adjustment (6).)
1 -3) The clearance between the clutch and
Reduce the number of the adjusting shims. (Referto Disassembling &
Assembling Procedures.)
thepulley istoo large.
—I 1-4) The safely place has stuck.
4)-A Tlie .safetyplate has stuck against the
Correctthe clearance between the safety plateand the workclampfoot
pedal pressure decreasing unit.
—
lifting lever. (Refer to Standard Adjustment (7).)
1-5) The tension of the high-speed or
Collect the tension of the belt. (Refer lo Standaril Adjustment(21).)
losv-spced beltLs not high enough.
I 6) The stop-motion hook h-asbeen
positioned improperly.
6) A An c.xcessive clearance i.sprovided
Correctly positionthe stop-motion hook. (Refct to Standurd AdjuMmcnt (3).I
lietwecn the stop-motion hook and
the .stop-motion cam when the machine
runs at low speed.
7)-A In want of grease
Supply grease through the hole in the main shaft. (See "Parts to be rUlcd
with grease".)
I 8) The idling area is reached when the
8) -A The stop-rootion timing is wrong.
Correctthe Mop-motion timing. (Refctto StandardAdjustment (4).)
needle penetrates material.
I 9) Tile machine torque is abnormally
large.
19) A The worm has no backlash.
H TIic crank rod ha.< .ituck.
9) C Tlic feed cim roller .sticks against the
feedcamgroove.
2. The machine docs not run at higli
speed.
(Change between low-speed and
high-speed is not made, and therefore
the machine does not run at normal
sewing speed.)
2 -1) The pressing plate has been po.sitioned
1 Provide the worm with aproper backlash. (Refer toOther Precautions (4).)
]
II Move the orcilbting rock shaft laterally to correct the sticking.
Replace the feed cam roller with a proper one. (Refer to Other Precautions
(5).)
Correctly positionthe pressing plate. (Referto Standard Adjustment IS).)
improperly.
2- 2) The clearance between the clutch and
Correct the position of the pressing plate and the starting leverstopper.
the pulley is not correct.
(Refer to Standard Adjustment (5)and(6).)
2-3) The machine torque is too large.
1 Remove slicking ofthe main shaft, shuttle driver shaft, etc.
2 4) Belt tension is not high enough.
2-5) The clutch slips.
J
Correct Iwit tension. (Refer to Standard Adjustment (21).)
5)- A The clutch ha.s worn.
Increase or decrease the number of adjusting shims. (Referto Disassembling
Procedures.) If this docs not correct the trouble, replace the clutch.
5) B Tlie clutch has grease on its surface.
3. Tliemachinekeepson runningand
Gcan the clutch surface.
3 -1) The stop-motion lever has stuck.
Supply grease to the stop-motion lever.
3-2) The pressingplate has worn or is in
Replace the pressing plateor applygrcaaie to the pressing plate.
does not stop in continuous sewing.
want ofgrease.
From the library of: Superior Sewing Machine & Supply LLC
47
Cause (1)
Trouble
4. Tlic clutch gets hot.
(The clutch gets hot during idling.)
Cause (2)
Corrective measures
41) The pressing plate has been positioned
improperly.
Correctly position the pressing plate.
(Refer to Standard Adjustment (5).)
4 -2) The high-speed pressing plate has worn
Replace the pressing plate.
out.
4-3) Tlie clearance between the higli-speed
Increasethe number of the adjustingshims. (Refer to Disassembling &
and low-speed tapered clutches is less
Assembling Procedures.)
than 0.8 mm
4-4) The clearance at the high-speed flat
Decreasethe number of the adjusting shims. (Refer to Disassembling &
clutch is much smaller than 0.2 mm
Assembling Procedures.)
4 -5) The inner ting of the high-speed
bearing is in want of grease.
S. Abnormal sound is heard.
Apply grease to the inner ring.
5 1) The bearing has worn out or
1 Replace the bearing. (Refer toDisassembling &Assembling Procedures.)
|
1 Provide the worm with aproper back-lach. (Refer to Other Precautions (4).)
|
scratched.
6. The stop motion is not engage.
(The machine stops without entering
-] 6-1) Tlie machine torque is large.
|
—| l)-A The worm has no back-lash
the stop motion.)
]
—I Check each part for proper adjustment to eliminate such excessive torque.
1) ' B Excessive torque due to maladjustment
of the parts.
6-2) The stop-motion is too early, and the
stop motion is engaged one stitch
]
Correct the stop-motion timing. (Refer to Standard Adjustment (4).)
earlier.
7. The slop motion is engaged during
liigli-speed operation.
7 -1) The changing pulley deflects much.
|-
Replace the part.
7-2) Tlie stop-motion timing is too late.
Correct the stop-motion timing. (Refer to Standard Adjustment (4).)
7-3) The high-speed clutch has grease on
Gean the clutch surface.
its surface.
7•-4) The pressing plate has been positioned
Correct the position of the pressing plate. (Refer to Standard Adjustment
improperly.
8. Titc work clamp fool will not go up.
(The work clamp foot will not rise
-| 8-I) niebelt slips.
(5).)
[-
—
1)-A The tension of the low-speed belt is not
Correct the belt tension. (Refer to Standard Adjustment (21).)
high enough.
even though the motor runs.)
i) - B The height of the work clamp foot is
Correct the height of the work clamp foot. (Refer to Standard Adjustment
OTong.
(9).)
1)-C Tlie work clamp foot comes in contact
Correct the position of the wiper. (Refer to Standard Adjustment (10).)
with the wiper.
8- 2) The safety plate sticks!"
Correct the clearance between the safety plate and the work clamp foot
lifting lever. (Refer to Standard Adjustment (7).)
8-3) Failure with the pedal pressure
decreasingunit.
3)-A The reverse rotation preventing latch
Correct the length of the clutch spring or the eccentric shaft, or replace the
clutch spring. (Refer to Disassembling& AssemblingProcedures.)
does not engage with the pressure
decreasing clutch latch properly.
3)-B The stopper .screwof the pressure
Correctly adjust the stopper screw. (Refer to Disassembling & Assembling
decreasing unit frame has been
Procedures.)
adjusting improperly.
3)-C The clutch spring has worn out.
3)-D The input shaft has worn out.
'
"]
|
1 Replace the clutch spring. (Refer to Disassembling &Assembling Procedures.)
1 Replace the input shaft. (Refer to Disassembling &Assembling Procedures.)
From the library of: Superior Sewing Machine & Supply LLC
-48-
|
Cause (1)
Tk'ouble
9. The work clamp foot will not go down.
-| 9-1) Tlie safety plate sticks.
C^use (2)
Corrective measures
[
Correct the clearance between the safety plate and the work clamp fool
Uftinglever. (Refer to Standard Adjustment (7).)
(The work clamp foot will not dcitccnd
even though the motor runa.)
9-2) The tension release bar hits other part.
10. The starting lever will not move even
when the pedal is depressed.
)-
2)- A The tension release bar hits the face
plate.
Correctly adjust the tension release bar. (Refer to Standard Adjustment (11).)
2) A The safety plate has been adjusted
Correct the clearance between the safety plate and the work clamp foot
lifting lever. (Refer to Standard Adjustment (7|.)
10-l)The stop-motion regulating arm sticks.
10 ' 2)The work clamp fool comes down.
but the pedal cannot be dcpresitcd
Remove the axial sticking. (Refer to Standard Adjustment (3).)
improperly.
to the machinestarting position.
2)-B The starting lever stopper has been
adjusted improperly.
Properly adjust the starting lever stopper. (Refer to Standard Adjustment
(6).)
10 3)Thc starting lever stopper has been
Correctly adjust the starting lever stopper. (Refer to Standard Adjustment
maladjusted.
11. Abnormal sound (cimttcring) is heard
grom the pedal pressure decreasing
(6).)
I)The clutch spring is wearing out
(chattering).
Supply grease to the clutch spring.
unit.
— II 2ITIic clutch spring slips, (chattering)
-j 2) AThe clutch spring has worn out.
|
11 - 3) The reverse rotation preventing latch
~| 3)-A The clutch spring has worn out.
[——| Replace the clutch spring. (Refer to Disassembling &A.sseinbling Procedures.)
engages with the pressure decreasing
clutch latch improperly.
(chattering)
Correct the eccentric sluft or the length of the elulch spring.
(Refer to Disassembling & As.sembling Procedurc.s.)
—I II •4)Thc ball bearinghasscratches.
12. The thread slips off the needle.
(The thread slips off the needle at
12 I) Stitch skipping at the first stitch.
the rir.st, .second or third stitch
before any stitch is formed.)
—{ Replace the bearing.
1)—A The timing between the needle and
the shuttle is wrong.
is not long enough.
~|
Correct the timing and the clearance between them. (Refer to Standard
Adjustment (13).)
—I 1)-B The feed timing iswrong.
12 2) The thread remaining on the needle
1 Replace the clutch spring. (Refer to Disas-scmbliiig &Assembling ftocedures.) ]
Correct the timing of the feed cam. (Refer to Standard Adjustment (2).)
2) -A The tension controller No. 1 has been
Correct the tension of the tension controller No. I. (Refer to Standard
Adjustment (19).)
adjusted improperly.
Correctly adjust the tension release bar. (Refer to Standard Adjustment
2)-6 The tension release bar has been
maladjusted.
(11).)
2)- C The stroke of the thread take-up
spring has been maladjusted.
Correct the stroke of the thread take-up spring. (Refer to Standard
2)- D Tire difference in level between the
Correct the height of the moving knife and the counter knife. (Refer to
Standard Adjustment (17).)
Adjustment (20).)
counter knife and the moving knife
is not correct.
12 -3)Tlic bobbin thread is not long
enough.
3) - A The difference in level between the
Correct the height of the moving knife and the counter knife. (Refer to
Standard Adjustment (17).)
counter knife and tlic moving knife
is not correct.
—I 3)-B The shuttle race spring has scratches.
3)-C The bobbin thread tension is too
)
1 Remove the scratches.
|
Correct the bobbin thread tension.
high.
12 4) The bobbin thread protrudes due to
Replace the bobbin case and the bobbin with tho.se exclusively used for
racingof the bobbin.
LK-1850.
From the library of: Superior Sewing Machine & Supply LLC
49-
[
Cause (2)
Cause (1)
Trouble
13. Needle btcakage
13-1) The clearance between the shuttle
Corrective measures
Correct the clearance between the needle and the shuttle driver.
(Refer to Standard Adjustment (13).)
driver needle guard and the needle
is not correct.
-| Correct the feed cam timing. (Refer toStandard Adjustment (2).)
—I 13 -2) The feed timing isnot correet.
—I 13-3) The needle hole guide has scratches.
[-
Remove the scratches, orreplace the needle hole guide.
13-4) The needle hits the work cbmp
(8).)
foot.
-5) The needle hits the moving knife.
!4. Stitch skipping
|
Correct the position of the work clamp foot. (Refer to Standard Adjustment
—I Properly position the moving knife. (Refer to Standard Adjustment (I6)~
}-
14 -I) Tlie timing between the needle and
die shuttle is wrong.
Correct the timing and clearance between them. (Refer to Standard
Adjustment (13).)
—I Replace orproperly attach the needle.
14-2) Tltc needle is bent or has been
|
attached improperly, or the needle
point is blunt.
—I Correct the feed cam timing. (Refer to Standard Adjustment (2).)
—I 14 3) The feed timing isnot correct.
14-4) The clearance between the shuttle
Correct the clearance between the needle and the shuttle driver.
(Refer to Standard Adjustment (13).)
driver needle guard and the needle
is not correct.
15. Thread breakage
15
I)
1) A Scratch on point A (due to needle
Scratches on the shuttle.
strikingthe shuttle)
1)-B Scratch on point B (produced when
the needle bends or breaks)
1)-C Scratch on point C (The shuttle has
been scratched at the needle when
removed.)
1)-D Scratch on point D
Smooth out the shuttle point with an oil stone, then burnish using a blue
polisliing sand bar or the like. Correct the clearance between the needle and
tlic shuttle. (Refer to Standard Adjustment (13).)
Smooth it out svith an oil stone, then burnish using a blue polislting sand bar
or the like.
Smooth it out with an oil stone, then burnish using a blue polishing sand bar
or the like.
Smooth it out with an oil stone, then burnish using a blue polishing sand bar
or the like.
2)-A The shuttle race spring has been
positioned improperly.
15-2) Tlie thread bites into the shuttle.
2)-B The shuttle blade point A has been
rounded. (———f^"
—
(12).)
Replace the shuttle.
2)'-C Tile shuttle race has positioned
improperly.
Correct the position of the shuttle race. (Refer to Standard Adjustment
2)~D The needle thread tension Lsnot high
enough.
Correct the needle thread tension.
—I IS 3) if ile shuttle driver has scratehes.
(13).)
1 Remove the scratches. ~]
15 -4) The clearance between the shuttle
Correct the clearance between the shuttle driver and the shuttle.
(Refer to Standard Adjustment (13).)
driver and the shuttle is not correct.
—I IS-5) The needle hole guide has scratches.
Correct the position of the shuttle race spring. (Refer to Standard Adju.stmcnt
"{-
-| Remove the scratches, orreplace the needle hole guide.
From the library of: Superior Sewing Machine & Supply LLC
50
|
Cause (1)
Trouble
Cause (2)
Corrective measures
Replace or properly attach the needle.
15 6) Tlie needle has scratches, or has been
bent or attached improperly.
—I Properly position the work clump foot. (Refer toStandard Adjustment (8).)
15-7) The work clamp foot has been
positioned improperly.
15- 8) The stroke of the thread take-up has
been maladjusted.
8)-A The stroke of the thread take-up
spring is too large.
Correct the stroke. (Refer to Standard Adjustment (30).)
8) B The tension of the thread take-up
Correct the tension of the thread take-up spring. (Refer to Standard
Adjustment (30).)
spring is too higli.
—I 15-9) The needle thread tension is too higli. "|—
—I 15-10) Die shuttle does not rotate properly.
Correct the needle thread tension.
10)-A There arc Hbrous wastes on the .shuttle
 Remove the .shuttle, and remove the fibioiis wastes. |
race racing surface.
10)-B Poor lubrication
16. Thread brcak.^ at time of thread
Irimminj:.
(normal thread trimming is not dime
at the last stitch, and cilhci needle
thread or Ixibbin tJiread is cut.)
16 1) The tension release timing is not
|
1) -A Thread is tiimmcd before thread
) Lubiieatc the shuttle .rssembly,
~|
Correctly adjust the tension release bat. (Refer to Standard Adjustment (11).)
tension is released.
correct.
--| 16 3) Tlie moving knife has scratches.
Using a blue polishing sand Ikii or the like, burnish the moving knife with
attention paid to the blade.
-| 16 3) Tlie shuttle race spring has .scratche.s.
16 ~4)
[—
The height of the counter knife is not
Remove the scratches.
4)-A The thread is cut by the projection of
the moving knife before it is trimmed
by the moving knife.
correct.
16 5) The thread path of the bottom
surface of the needle hole guide
5) A The thread is cut by the needle hole
guide.
Correct the height of the moving and counter knives. (Refer to Standard
Adjustment (17).)
Smooth out the thread path using a blue polishing sand bur or the like, or
replace the needle hole guide.
is not smooth.
16 -6) Tlie thread spreading timing of the
Properly position the auxiliary knife driving cam and the moving knife.
moving knife is bad.
(Refer to Standard Adjustment (15) and (16).)
16 7) Tlie needle thread tension is too high.
) 7. Thread trimming failure (Ttte needle
17 I) The knives are blunt.
[
thread or bobbin thread is not
|—
Correct the needle thread tension.
1> A The moving knife or the counter knife
I Replace the moving knife or counter knife.
|
have worn out.
trimmed, or the needle thread is
trimmed extremely lung or short
upon completion of bartacking.)
1)-B The moving knife does not engage with
the counter knife propcily.
Collect the height of the moving and counter knives. (Refer to Standard
Adjustment (17).)
I) -C Tltc moving knife has an improper
Tltc backlash should be 0.05 (0.001") to 0.1 mm (0.003") at the end of the
moving knife. Replace the hinge screw or the moving knife.
vertical backlash.
I )-D The tilt of the eountci knife is not
correct.
17 3) ribrous wastes remain in the cylinder
«m cap.
3)- A The portion A of llic moving knife has
a buir. (Thread is trimmed in improper
shape
).
Correct the till of the blade point of the counter knife. (Refer to Standard
Adjustment (18).)
Buriiush file moving knife using a blue polisliiiig .sand bar or the like with care
taken to the hladc, or replace the moving knife.
and thread
waste
remains.)
From the library of: Superior Sewing Machine & Supply LLC
-51 -
Cause (1)
Trouble
Cause (2)
Corrective measures
2)-B The shuttle race spring has a scratch.
(Thread is trimmed in improper
shape
, and thread waste
~r
Remove the scratch.
remains).
17 3) The moving knife docs not spread the
3)-A The moving knife has been positioned
improperly.
threads.
Correctly position the moving knife. (Refer to Standard Adjustment (16).)
—I 3)-B The moving knife has awrong path.
Replace the moving knifeor the throat plate. (Refer to StandardAdjustment
(16).)
—] 3)-C Stop-motion failure.
|
Refer to6 ofTroubles and Corrective Measures.
3) D The shuttle race spring has been
positioned improperly.
-| 17-4) The last stitch isskipped. |—
(12).)
4) A The timing between the needle and
Correct the timing and clearance between the needle and the shuttle.
(Refer to Standard Adjustment (131.)
the shuttle is bad.
18. Inrcrior stitch tishtncs.s
-| 18 1) The feed timing is bad.
[
Correct the position of the shuttle race spring. (Refer to Standard Adjustment
]
Correct the feed cam timing. (Refer to Standard Adjustment (2).)
18-2) The tension controller No. 2 has been
2) A The needle thread tension is not high
enough.
maladjusted.
--L
Increase the tension.
1 Correctly install the tension controller No. 2
18- 3) Tlie tension controller No. 2 Is
|
released.
18-4) The needle thread stitches intersect
with each other as illustrated below.
19. Stitching failure in bartacking with
19 -1) Thread breaks due toheat generated.
a synthetic thread
Orient the needle to the left by 5 to 10 degree.
vwvw
|—•—| 1) A The sewing speed is too high
L[
1) -B The needle is too thick.
Replace the motor pulley with one for synthetic thread.
[
>—[ Replace it with athinner needle or SUPl-lR needle for synthetic thread.
Use sillcone lubricant.
—I 19-2) Tliread is split finely.
|
12) AThe thread paths are not smooth. [-
Burnish the thread path of each part using a blue polishing sand bar or the
like.
- 19 3) Tire starting stitch is loose.
|
3)-A flic feed timing is bad.
Correct the feed cam timing. (Refer to Standard Adjustment (2).)
(Adjust it to 10 mm (35/64") or so.)
From the library of: Superior Sewing Machine & Supply LLC
-52-
]
Model LK-1850 Series Dimensions of table (Forstandard)
Table part No. 13534102
I200<471)
800 (31 i )
2 (A ) Full
(2 r
Full periphery
(1J )
periphery
30(1 A)
172 (62 )
130 (B 4 •)
Four leg mounting holes
(Make these holes at time setup.)
20
108(4 1)
(C)
(c) hole
4—8.5(2 )hole
26' 1A 'Spot facing depth 5.5i» 
30 (1 A • hole
(Make thishole onlywhenP type
is used.)
72(28 )
30 <1 A) hole
51'? A )spot facing depth 5 (a
Funnel stopper
' mounting hole
(Make this hole at
time of setup)
3—8 '• A )hole
Mounting hole for oil drain funnel
564
i?7a
(Makethis holeat timeof setup)
(4U)
sod ft '
10(8)
(Note) Alldimensions are in millimeter. (Notscale)
From the library of: Superior Sewing Machine & Supply LLC
Table part No. 13545207
For Sewing Machine for Attaching Belt Loops
12 00 (471 )
>Full
SlOCil!; )
1 40_ j
2(.^ )Full
peripheryX^ ' (il")
periphery
30.s'-'
I
P
'
v17(2)bore
Four leg mounting holes
30(1.'. )hole
(Make these holes at time setup.)
(Make this hole only when
4—8.5(« )bore
ru
P type is used.)
26'. 1ispot facing depth 5 5(; i
Top
30(1
(3!
ibore
of
Table
)
51 (?.. (spot facing depth 5(i;
Mounting hole for oil drain funnel
(Make this hole at time of setup).)^
(S )
20(!! )
20
3—8( '. ihole
20
(C )
oa)
90(32)
Funnel stopper mounting hole
;
(2in
20 3 )
(Make this hole at time of setup.)
246
o:;)
171.
2(.'.)
L
k
(i)
•0(2)
-4 -
(Note) All dlmsnsions are millimeter. (Not scale)
From the library of: Superior Sewing Machine & Supply LLC
c
r.
TOKYO JDKI INOOSTRiAL CO.. LTO
Address
23-3. Kabuki-cho'1-chome. Shinjuku-ku,
Tokyo 160,Japan
Cable
Telex
Phone
JUKI TOKYO
J22967, 232-2301
03 (205)1188,1189,1190
JULY 1983 Printed in Japan(T)
From the library of: Superior Sewing Machine & Supply
LLC