JUKI LH-4128 User manual

ENGLISH
LH-4128, 4128-7
LH-4168-7, 4188-7
INSTRUCTION MANUAL

i
CONTENTS
1. SPECIFICATIONS........................................................................................................... 1
2. NAME OF EACH COMPONENT .................................................................................... 2
3. INSTALLATION............................................................................................................... 3
3-1. Installing the bottom cover.................................................................................................................................. 3
3-2. Opening and closing of the control box (SC-910) ............................................................................................. 4
3-3. Adjusting the height of the knee lifter ................................................................................................................ 5
3-4. Installation of thread stand.................................................................................................................................. 5
3-5. Caution when installing the panel ...................................................................................................................... 5
3-6. Connecting the cord............................................................................................................................................. 6
3-7. Managing the cord................................................................................................................................................ 8
3-8. Adjusting the knee lifter detection seat (asm.) ................................................................................................ 10
4. PREPARATION OF THE SEWING MACHINE ............................................................. 11
4-1. Lubrication .......................................................................................................................................................... 11
4-2. Cleaning the lter ............................................................................................................................................... 12
4-3. Adjusting the amount of oil in the hook .......................................................................................................... 13
4-4. Attaching the needles ........................................................................................................................................ 13
4-5. How to take out the bobbin case ...................................................................................................................... 14
4-6. Inserting a bobbin in a bobbin case ................................................................................................................. 14
4-7. Threading the machine head............................................................................................................................. 15
4-8. Thread tension.................................................................................................................................................... 16
4-9. Thread take-up spring........................................................................................................................................ 16
4-10. Adjusting the stitch length .............................................................................................................................. 17
4-11. Winding the bobbin thread .............................................................................................................................. 18
4-12. Adjusting the needle stop position................................................................................................................. 19
4-13. Pedal pressure and pedal stroke .................................................................................................................... 20
4-14. Adjustment of the pedal................................................................................................................................... 20
5. OPARATION OF THE SEWING MACHINE.................................................................. 21
5-1. Pedal operation................................................................................................................................................... 21
5-2. Hand lifter............................................................................................................................................................ 22
5-3. Adjusting the pressure of the presser foot ...................................................................................................... 22
5-4. Thread tension release changeover when using the knee lifter .................................................................... 23
5-5. Separately driven needle changeover switch (for LH-4168-7 and 4188-7).................................................... 24
5-6. One-touch reverse feed switch lever (for touch-back) ................................................................................... 25
6. MAINTENANCE............................................................................................................ 25
6-1. Changing procedure to bottom feed and the adjustment (LH-4128 without thread trimmer only)............. 25
6-2. Changing procedure to needle feed (for LH-4128 only) ................................................................................. 27
6-3. Adjusting the inner hook guide......................................................................................................................... 28
6-4. Needle-to-hook relation ..................................................................................................................................... 29
6-5. Adjusting the height and the inclination of the feed dog ............................................................................... 32
6-6. Adjusting the presser foot ................................................................................................................................. 32
6-7. Move (adjustment) of the hook shaft saddle when replacing the gauge ...................................................... 33
6-8. Adjusting the thread presser spring................................................................................................................. 33
6-9. Adjusting the position of the moving knife...................................................................................................... 34
6-10. Replacing the bobbin thread slack preventer spring (for LH-4168-7 and 4188-7) ...................................... 35
6-11. Adjusting the hook needle guard.................................................................................................................... 35
6-12. Stop of the needle bars and angle of corners for corners stitching (for LH-4168-7 and 4188-7) ............... 36
6-13. Caution when installing the gauge to the bed slide...................................................................................... 36
6-14. Position of the wiper ........................................................................................................................................ 37
6-15. Replenishing grease to the specied places (for LH-4168-7 and 4188-7)................................................... 37
6-16. Cleaning the inside of the needle bar bushing.............................................................................................. 39
7. STITCH-TO-ANGLE TABLE BY GAUGE (PITCH AND mm CONVERSION TABLE) ... 40
8. GAUGE SETS............................................................................................................... 41
9. TROUBLES AND CORRECTIVE MEASURES ............................................................ 46

– 1 –
1. SPECIFICATIONS
*13,500 sti/min when the stitch length exceeds 4 mm.
*2S : Standard, F : Foundation, G : Jeans
Model name LH-4128
LH-4128-7
(with automatic
thread trimmer)
LH-4168-7
(with automatic
thread trimmer
incorporating corner
stitching)
LH-4188-7
(with automatic
thread trimmer
incorporating corner
stitching)
Application For light-, medium-
and heavy-weight materials
For medium- and
heavy-weight
materials
Specication type *2S, F, G S, G G
Hook Standard hook Large hook
Thread trimmer Not provided Provided
Separately
driven needle bar
mechanism
Not provided Provided
Max. sewing speed 4,000 sti/min *13,200 sti/min
Needle DP x 5 #9 to #16 (For S type), DP x 5 #9 to #11 (For F type), DP x 5 #16 to #22 (G type)
Gauge size 1/8" to 1-1/2"
3.2 to 38.1 mm
5/32" to 1-1/4"
4 to 31.8 mm
5/32" to 1"
4 to 25.4 mm
5/32" to 1"
4 to 25.4 mm
Lift of presser foot 12 mm by knee lifter, 5.5 mm by hand lifter lever, 9 mm by knee lifter with wiper
Lubrication New Defrix Oil No. 1
Noise
• LH-4128 / 4128-7
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 83.5 dB ; (Includes KpA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 4000 sti/min.
- Sound power level (LWA);
A-weighted value of 88.0 dB ; (Includes KWA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 4000 sti/min.
• LH-4168-7
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 78.0 dB ; (Includes KpA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 3200 sti/min.
• LH-4188-7
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 84.5 dB ; (Includes KpA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 3200 sti/min.
- Sound power level (LWA) ;
A-weighted value of 89.0 dB ; (Includes KWA = 2.5 dB) ; according to ISO 10821- C.6.2 -ISO
11204 GR2 at 3200 sti/min.

– 2 –
2. NAME OF EACH COMPONENT
1Separately driven needle
changeover switch
2Thread take-up cover
3Finger guard
4Thread tension controller
5Control box
6Pedal
7Knee lifter lever
8Power switch
9Hand switch
!0 Operation panel
!1 Bobbin winder
!2 Thread stand
!3 Oil supply opening
!4 Reverse feed control lever
! Hand lifter lever
!2
!3
!4
8
6
7
5
!0
!1
91
4
3
2
!

– 3 –
3. INSTALLATION
3-1. Installing the bottom cover
1) The bottom cover should rest on the four
corners of the machine table groove.
23.5 mm 19.5 mm
4) Fit hinge 6to the machine main body with
screws.
Fit the machine head to table rubber hinges
7and place it on head cushions 8on the
four corners.
2) Fix two head support rubber seats 1on the
front side Ato the protruding section of the
machine table using nails 2. Fix two machine
head cushion seats 3on hinge side Busing
a rubber-based adhesive, Then place bottom
cover 4 on the xed seats.
3) Remove air vent cap 5attached to the
machine bed. (Be sure to attach cap 5when
transporting the machine head in the state
that the machine head is removed from the
machine table.)
If the sewing machine is operated
without removing air vent cap 5,
oil leakage from gear box portion
Cmay occur.
1
3
1
3
5
C
6
4
8
7
1
2
4
3
AB

– 4 –
3-2. Opening and closing of the control box (SC-910)
When opening and closing the control box, move
the knee lifter components 2to the position
where screw hole 1can be observed and perform
the work.
For the connection of the cords and setting of the
control box, refer to the Instruction Manual for
SC-910 together with this Instruction Manual.
1
2
5) In case the AK-device is not provided, attach
head support rod 9to the machine table.
6
7
9
6) Place urethane lter !0 on A. Then put sheet-
metal (ne-mesh sheet) type lter !1 on the
urethane lter.
Place sheet-metal (ne-mesh sheet) type
lter !2 on B.
Remove inlet port for circulation !3 xed on
the right hook driving shaft saddle. Remove
cap !4 from the end of the inlet port. Then,
securely insert the inlet port into lter ! until
it will go no further.
If inlet port for circulation !3 is not
fully inserted into lter !, a faulty
circulation can occur.
!3
AB
!0 !
!1
!4
!2

– 5 –
3-3. Adjusting the height of the knee lifter
1) The standard height of the presser foot lifted using the knee lifter is 12 mm.
2) You can adjust the presser foot lift up to 13 mm using knee lifter adjust screw 1.
Do not operate the sewing machine in the state that the presser foot 3is lifted by
12 mm or more since the needle bar 2comes in contact with the presser foot 3.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
1
2
3
3-4. Installation of thread stand
Assemble the thread stand, set it up on the machine table using the installation hole in the table and
tighten nut 1gently. When you use power supplied by the overhead power line, pass the power supply
cord through hollow spool rest rod 2.
1
3-5. Caution when installing the panel
Use washers, toothed lock washers, and screws
1mounted on the machine head when installing
the panel.
The screws attached to the panel
may damage the screw holes since
the pitch of the screws is different
from that of the machine head.
1
2

– 6 –
4) Connect 14P code 1coming from the
machine head to connector 7(CN46).
5) Connect 4P connector coming from the
machine head 4to connector 8(CN31).
6) Connect 4P connector 3(safty switch
connector) coming from the machine head to
connector 9(CN48).
7) Connect 7P connector 2coming from the
machine head to connector !0 (CN30).
8) Connect connector 5coming from the
machine head to connector !1 (CN38, CN39).
(Connect 8P connector to CN38 and in case
of 9Pconnector, connect to CN39.)
9) When the optional AK125 device is attached,
connect 2P connector !9 coming from the AK
device to connector @0 (CN40).
Be sure to securely insert the
respective connectors after
checking the inserting directions
since all connectors have the
inserting directions. (When using a
type with lock, insert the connectors
until they go to the lock.)
The sewing machine is not actuated
unless the connectors are inserted
properly. In addition, not only the
problem of error warning or the
like occurs, but also the sewing
machine and the control box are
damaged.
1) Pass the cords 1of the thread trimming
solenoid, reverse-stitching solenoid, etc.,
and the cords of the synchronizer 2, safety
switch 3, machine head 4P connector 4,
motor signal 5, motor output 6through hole
A in the table to route them down under the
machine table.
2) Loosen setscrew !2 in front cover !.
3) Pressing the side of front cover ! in the
direction of the arrow, open the front cover
toward you.
Be sure to open / close the front
cover with your hands.
(1) LH-4128,4128-7,4168-7,4188-7
52
1
4
3
6
A
3-6. Connecting the cord
!
!2
5
4
9
!0
!1
2
3
7
!9
@0
8
1
$

– 7 –
6) Remove setscrew $0 located on the left-hand
side of the power switch, and place the point
of earth cord (asm.) $3 coming from knee
lifter detecting sensor plate (asm.) $2 to the
setscrew. Then tighten the setscrew.
When the earth cord has not been
connected, malfunction will be
caused.
7) Connect knee lifter detection sensor
connector $4 to connector $ (CN32).
(2) 4168-7,4188-7
In addition to “3-6. (1)”, connect the cords below.
1) Pass separately driven needle changeover switch cord @1, separately driven needle solenoid cord
@2 and separately driven needle sensor cord @3 through hole A in the table to route them down
under the machine table.
2) Connect 10P connector @1 coming from the machine head to connector @4 (CN125).
3) Connect 8P connector @2 coming from the machine head to connector @ (CN129).
4) Connect 6P connector @3 coming from the machine head to connector @6 (CN128).
5) Remove the cord extending from #2 (COM) from #0 (BNC) and connect it to #1 (LH).
$2
$0
$3
$4
#1
#2
@1
@2
@3
#0
@6
@
@4
Optional unit A

– 8 –
[Connection of the connector for CP panel]
Exclusive connectors are prepared for connection
of the connector for CP-160.
Paying attention to the orientation of the
connector, connect it to connector !4 located on
the circuit board. After connecting, securely lock
the connector.
[Connecting for IP panel]
The connector for connecting IP-100 and IP-110
are prepared.
When connecting, insert the connector until it is
locked to
@3
.
2) After inserting the connector, put all cords
together with cable clip band !3 located on
the side of the box. At this time, bundle the
cords (connector CN46) of thread trimming
solenoid, reverse feed solenoid, etc., AK
cord (connector CN40) and motor signal cord
(connector CN39) to wire saddle @, bundle
detector cord (connector CN30) above wire
saddle @, knee lifter detection sensor cord
(connector CN32) between wire saddles @
and @6 and other cords to wire saddle @6.
1. Fix the cord clamp and the
cable clip band following the
attaching procedure.
2. When removing the connector,
remove it from the wire saddle
and remove it while pressing
the hook of the cable clip band.
1) Fix all cables coming from the machine head
with cable clip band Battached to tie-mount
A.
A
B
1. Fix the cable clip band following the attaching procedure as shown in the gure.
2. To remove the cable clip band, push the cable clip band until it comes off while pressing
the hook of the band following the removing procedure as shown in the gure.
How to x cable clip band !3
Pull
How to remove cable clip band
Pushing the hook portion, push the band to remove it.
Pull Push
Push Push the hook.
3-7. Managing the cord
!4
@3
@
!3
@6

– 9 –
5) Connect motor output cord 6to connector !6
located on the side of the box.
6) Connect connector 4P !7 of the power switch
to connector !8.
Route the motor output cord from
the front face of the box.
3) Close front cover ! while paying attention to
pinching of the wire.
Lightly press portion Band insert front cover
! with “click”.
4) After that, x it with the screw !2.
7) Make sure that the power switch is turned
OFF and insert power supply cord @1 coming
from the power switch into the power plug
socket. (Illustration is for the japanese
specication 100V type.)
1. Top end of power supply cord
varies in accordance with
destination or supply voltage.
Check again the supply voltage
and the voltage designated on
the control box when installing
the switch.
2. Prepare the power switch
conformed to the safety
standard.
3. Be sure to connect the ground
wire (green / yellow).
6
!6
!7
!8
@1
!
B
!2

– 10 –
1) Turn ON the power.
2) Press knee pad plate 7and lift the presser
foot by 5 mm from the top surface of throat
plate.
3) Turn knee lifter detection seat (asm.) 4in the
direction of the arrow and x it at the position
where LED of knee lifter detection sensor 3
starts lighting with setscrew !3. At this time,
align the edge of detection seat (asm.) 4
with that of knee lifter detection sensor 3.
When the edges of knee lifter
detection sensor 3and knee
lifter detection seat (asm.) 4are
not aligned, detection trouble will
be caused.
4) Conrm that LED goes out when knee pad
plate 7is released.
It is adjusted so that the knee
lifting motion is detected when
presser foot is lifted by 5 mm.
When using it with the lift amount
of less than 5 mm, reduce the
standard adjustment value and
re-adjust according to step 3).
5) When the magnet of knee lifter detection seat
(asm.) 4comes near the detection section
(+ mark section) of knee lifter detection
sensor 3, it detects that knee lifting has been
performed and LED lights up.
3-8. Adjusting the knee lifter detection seat (asm.)
4
!3
7
3
4
3
3
To align
edges
Conditions : LED starts lighting at presser
foot lift of 5 mm. LED
Detection section
Magnet LED
* For explanation, the gure above omits knee pad
plate and the like.

– 11 –
• When lling the oil tank with the oil initially, make sure that the oil amount
indicating rod works. When it does not work at this time, make it work by tilting the
sewing machine once.
• When you use a new sewing machine or a sewing machine after an extended period
of disuse, use the sewing machine after performing break-in at 3,000 sti/min or less.
• For the oil for hook lubrication, purchase JUKI New Defrix Oil No. 1 (Part No. :
MDFRX1600C0).
• Be sure to lubricate clean oil.
Fill the oil tank with oil for hook lubrication before
operating the sewing machine.
1) Remove oil hole cap 1 and ll the oil tank
with JUKI New Defrix Oil No. 1 using the oiler
supplied with the machine.
2) Fill the oil tank with the oil until the top end
of oil amount indicating rod 3aligns with
the upper engraved marker line of oil amont
indicating window 2.
If the oil is lled excessively, it will leak from
the air vent hole in the oil tank or proper
lubrication will be not performed. So, be
careful.
3) When you operate the sewing machine, rell
oil if the top end of oil amount indicating rod
3comes down to the lower engraved marker
line of oil amount indicating window 2.
WARNING :
1. Do not connect the power plug until the lubrication has been completed so as to prevent
accidents due to abrupt start of the sewing machine,
2. To prevent the occurrence of an inammation or rash, immediately wash the related portions if
oil adheres to your eyes or other parts of your body.
3. If oil is mistakenly swallowed, diarrhea or vomitting may occur. Put oil in a place where children
cannot reach.
3
2
2
1
Upper engraved
marker line
Lower engraved
marker line
4. PREPARATION OF THE SEWING MACHINE
4-1. Lubrication
When bringing the machine into use, the oil quantity in the oil tank will decrease
until the circulation lter is lled with oil. When the top of the oil quantity indicating
bar goes down under the lower engraved marker line, add oil again so that the
indicating bar rests in the range between the upper and lower engraved marker
lines.

– 12 –
■ Cleaning the plunger lter
1) Loosen setscrew 2to remove it from the
bed.
2) Loosen pipe stopper 3, and remove tube 4
and joint 5.
3) After removing dust adhered to the net section
of joint 5, return the lter to its home position.
4-2. Cleaning the lter
To ensure longer service life of your machine, be sure to periodically (approximately
once every three months) clean up the above-stated lter section (urethane lter
A, circulation lter B, plunger lter C and plunger lter 2 D). When the lter is
clogged, lubrication trouble will occur and break-down will be caused.
In addition, when the oil becomes dirty, replace the oil gathered in the oil tank 1
and the under cover.
Circulation
Circulation
Lubrication to hook
Lubrication
1
C
B
A
D
Plunger
3
4
2
3
55
4

– 13 –
4-3. Adjusting the amount of oil in the hook
Adjust the amount oil using adjusting screw 1. Turn screw 1clockwise to increase the amount of oil
in the hook or counterclockwise to decrease it. Measure the amount of oil in ve seconds. When the
amount of oil is excessively decreased, break-down will be caused. So, be careful.
4-4. Attaching the needles
Oil splashes
Oil amount
decreases
Oil amount
increases
LH-4168-7, 4188-7
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
LH-4128, 4128-7
Switch "off" the motor.
Use DPx5 needles.
1) Turn the handwheel until the needle bar has
come up to the highest point of its stroke.
2) Loosen needle clamp screws 2and pick up
two needles 1in the way that their grooves
3are facing outwards.
3) Insert the needles into the needle clamp as
far as they will go.
4) Tighten needle clamp screws 2 rmly.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
1
2
3
2
1
3
1
2
2
1
1

– 14 –
4-5. How to take out the bobbin case
1) Lift latch 1and take out the bobbin case and
the bobbin together.
2) Hold the bobbin case by latch raised, put
it into the shaft in the hook correctly and
release the latch.
4-6. Inserting a bobbin in a bobbin case
[LH-4168-7 and 4188-7]
1) Set a bobbin to the bobbin case so that the
bobbin turns in the direction of arrow mark A.
2) Pass the thread through thread slit 1in the
bobbin case and draw the thread and pull
the thread so that it passes under the tension
spring.
3) Pass thread through another thread slit 2
then, pass it through thread slit 3on the
bobbin case from the inside.
4) Put the thread on bobbin threads slack
preventer spring 4.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
LH-4128, 4128-7
LH-4168-7, 4188-7
[LH-4128 and 4128-7]
1) Set a bobbin to the bobbin case so that the
bobbin turns in the direction of arrow mark A.
2) Pass the thread through thread slit 1in the
hook and draw the thread and pull it so that it
passes under the tension spring.
A
A
1
2
4
3
1
1

– 15 –
4-7. Threading the machine head
Thread the machine head following the order as illustrated in the gure.
Pass the left-hand needle thread, toward the machine head, in the order of 1to !. Pass the right-hand
needle thread in the order of Ato P.
Be careful of threading of needle clamp thread guides (!4, O).
Figure A for thin lament thread of #60 or less
Figure B for thick lament thread and polyester spun thread of #50 or more
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
Intermediate
thread guide
Fig A Fig B G type
!1 - L
!2 - M
!3 - N
!4
K
!0
O
P
A1
2
B
!
43
D
C
G
9
E
H
6
7
J
8- I
5F
LH-4188-7

– 16 –
1) Stroke of thread take-up spring 1on the right is adjustable by moving thread tension No. 2 asm.
3to the left or right after loosening thread tension No. 2 setscrew 2.
2) Stroke of thread take-up spring 4on the left is adjustable by moving thread tension No. 2 asm. 6
to the left or right after loosening thread tension No. 2 setscrew 5.
3) Move thread tension No. 2 asm. 3and 6to the right to increase or to the left to decrease the
stroke of the thread take-up spring.
When adjusting the stroke of thread take-up springs 1and 4, thread release pins
7and 8should not come in contact with disk release plate 9.
In addition, make sure that thread tension disks !1 and !2 securely rise when hand
lifter lever !0 is turned in the direction of the arrow.
4-9. Thread take-up spring
(1) When you want to change the stroke of the thread take-up spring
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
To turn
1) Needle thread tension
Turn thread tension nut No. 2 1clockwise to
increase or counterclockwise to reduce the
needle thread tension.
4-8. Thread tension
2) Bobbin thread tension
Turn tension adjusting screw 2clockwise to
increase or counterclockwise to reduce the
bobbin thread tension.
1
2
7
8
9
!1
!2
!0
2
3
4
6
1
5

– 17 –
(2) When you want to change the tension of the thread take-up spring
1) Tension of thread take-up spring 1on the
right is adjustable by turning spring stud !3 to
the right to increase or to the left to reduce.
2) Tension of thread take-up spring 4on the left
is adjustable by turning spring stud !4 to the
right to increase or to the left to reduce.
Turn stitch dial 1counterclockwise (clockwise)
to set the value on the dial corresponding to a
desired stitch length to the marker dot 3engraved
on the machine arm.
When it is hard to turn stitch dial 1, turn it while
slightly depressing reverse feed control lever 2.
• Reverse feed operation
1) Depress reverse feed control lever 2.
2) Reverse stitches are made as long as you
keep depressing the lever.
3) Release lever, and the machine will run forward.
4-10. Adjusting the stitch length
1
2
3
!3
!4 1
4

– 18 –
1. When winding the bobbin thread, start the winding in the state that the thread
between the bobbin and thread tension disk 7is tense.
2. When winding the bobbin thread in the state that sewing is not performed, remove the
needle thread from the thread path of thread take-up and remove the bobbin from the hook.
3. There is the possibility that the thread pulled out from the thread stand is
loosened due to the inuence (direction) of the wind and may be entangled in the
handwheel. Be careful of the direction of the wind.
6) In case that the bobbin thread is not wound
evenly on the bobbin, loosen the nut 6and
turn the bobbin thread tension to adjust the
height of the thread tension disk 7.
• It is the standard that the center of the bobbin is
as high as the center of the thread tension disk.
• Move the position of the thread tension
disk 7to the direction of D as shown in the
figure on the left when the winding amount
of the bobbin thread on the lower part of the
bobbin is excessive and to the direction of E
as shown in the figure on the left when the
winding amount of the bobbin thread on the
upper part of the bobbin is excessive.
After the adjustment, tighten the nut 6.
7) To adjust the tension of the bobbin winder,
turn the thread tension nut 8.
D
E
7
7
7
6
8
1) Insert the bobbin deep into the bobbin winder
spindle 1until it will go no further.
2) Pass the bobbin thread pulled out from the
thread tension controller located on the right
side of the thread stand as shown in the
figure and wind clockwise the end of the
bobbin thread on the bobbin several times.
(In case of the aluminum bobbin, after winding
clockwise the end of the bobbin thread, wind
counterclockwise the thread coming from the
bobbin thread tension several times to wind
the bobbin thread with ease.)
3) Press the bobbin winder trip latch 2in the
direction of A and start the sewing machine.
The bobbin rotates in the direction of C and
the bobbin thread is wound up. The bobbin
winder spindle 1automatically as soon as
the winding is nished.
4) Remove the bobbin and cut the bobbin thread
with the thread cut retainer 3.
5) To adjust the winding amount of the bobbin
thread, loosen setscrew 4and move bobbin
winder trip latch 2to the direction of A or B.
Then tighten setscrew 4.
To the direction of A : Decrease
To the direction of B : Increase
4-11. Winding the bobbin thread
B
A
3
1
2
4
C