JUKI MO-114DN User manual

2-Needle, 2/3/4-Thread Overlock Sewing Machine
INSTRUCTION MANUAL
MO-114DN/104DN
IMPORTANT:
Read all safety regulations carefully and under-
stand them before using your sewing machine.
Retain this instruction manual for future reference.
MO-114DN
MO-104DN
EN

“IMPORTANT SAFETY INSTRUCTIONS”
When using an electrical appliance, basic safety precautions should always be followed, including
the following: Read all instructions before using this sewing machine.
“DANGER ____ To reduce the risk of electric shock:”
1. The appliance should never be left unattended when plugged in.
2.
Always unplug this appliance from the electric outlet immediately after using and before cleaning.
“WARNING ____ To reduce the risk of burns, re, electric shock, or injury to persons:”
1. Do not use the appliance as a toy. Caution is advised when the appliance is used by children, or
near children. This sewing machine can be used by children aged from 8 years and above and
persons with reduced physical, sensory or mental capabilities or lack of experience and knowl-
edge if they have been given supervision or instruction concerning use of the sewing machine
in a safe way and understand the hazards involved. Children shall not play with the sewing ma-
chine. Cleaning and user maintenance shall not be made by children without supervision.
2. Use this appliance only for its intended use as described in this manual. Use only attachments
recommended by the manufacturer as contained in this manual.
3. Never operate this appliance if it has a damaged cord or plug, if it is not working properly, if it
has been dropped or damaged, or dropped into water. Return the appliance to the nearest au-
thorized dealer or service center for examination, repair, electrical or mechanical adjustment.
4. Never operate the appliance with any air openings blocked. Keep ventilation openings of the
sewing machine and foot control free from the accumulation of lint, dust, and loose cloth.
5.
Keep ngers away from all moving parts. Special care is required around the sewing machine needle.
6. Always use the proper stitch plate. The wrong plate can cause the needle to break.
7. Do not use bent needles.
8. Do not pull or push fabric while stitching. It may deect the needle causing it to break.
9. Do not carry out sewing with a marking pin stuck in the material since doing so can cause knife/
needle breakage. In addition, do not attempt to cut anything other than fabric and thread with
the upper/lower knives.
10. Switch the sewing machine off “O” when making any adjustments in the needle area, such as
threading needle, changing needle, threading looper, or changing presser foot and the like.
11. Always unplug the machine from the electrical outlet when removing covers, when covers are
opened to thread the loopers, when lubricating or when making any other user servicing adjust-
ments mentioned in the instruction manual.
12. Never drop or insert any object into any opening.
13. Do not use outdoors.
14.
Do not operate where aerosol (spray) products are being used or where oxygen is being administered.
15. To disconnect, turn all controls to the off “O” position, then remove plug from outlet.
16. Do not unplug by pulling on cord. To unplug, grasp the plug, not the cord.
17. Basically, the machine should be disconnected from the electricity supply when not in use.
18. If the power cord of this appliance is damaged, it must be replaced with a special cord by your
nearest authorized dealer or service center.
19. (Except USA/Canada) This machine is provided with double insulation.
Use only identical replacement parts. See instructions for servicing Double-Insulated machine.
“SERVICING DOUBLE-INSULATED PRODUCTS
(Except USA / Canada)”
In a double-insulated product, two systems of insulation are provided instead of grounding. No
grounding means is provided on a double-insulated product nor should a means for grounding be
added to the product. Servicing a double-insulated product requires extreme care and knowledge
of the system and should only be done by qualied service personnel. Replacement parts for a
double-insulated product must be identical to those parts in the product. A double-insulated product
is marked with the words DOUBLE INSULATION or DOUBLE INSULATED.
The symbol may also be marked on the product.
“SAVE THESE INSTRUCTIONS”
“This overlock sewing machine is intended for household use only.”
1

Danger warn-
ing which is
not specied
There is a
risk of elec-
trical shock
There is a
risk of re
There is a
risk of injury
to hands, etc.
Prohibited
matter which
is not speci-
ed
Disassem-
bly/alteration
is prohibited
Do not
place n-
gers under
the needle
Do not pour
oil, etc.
Generally re-
quired behav-
ior
Disconnect
the power
plug
Congratulations on your purchase of a JUKI sewing machine.
Please be sure to read safety precautions in “To use the sewing machine safely” in the Instruction
Manual before use to fully understand the functions and operating procedures of the sewing
machine so as to use the sewing machine for a long time.
After you have read the Instruction Manual, please be sure to keep it together with the warranty so
that you can read it whenever necessary.
To use the sewing machine safely
Marks and pictographs included in the Instruction Manual and shown on the sewing machine are
used so as to ensure safe operation of the sewing machine and to prevent possible risk of injury to
the user and other people.
Warning marks are used for different purposes as described below.
WARNING Indicates that there is a possible risk of death or serious injury if this mark is
ignored and the sewing machine is used in a wrong manner.
CAUTION
Indicates the operation, etc. which can cause a possible risk of personal injury
and/or physical damage if this mark is ignored and the sewing machine is used in
a wrong manner.
Pictographs mean the following:
2

●Donotwipethesewingmachinewithsolvent
suchasthinner.
 Whenthesewing
machineissoiled,puta
smallquantityofneutral
detergentonapieceof
softclothandcarefully
wipeoffthesewing
machinewithit.
●Besuretousethesewingmachineinthe
temperaturerangefrom5ºCto40ºC.
 Ifthetemperatureisexcessivelylow,the
machinecanfailtooperatenormally.
WARNING
Forthecombinationofthematerialandthethreadandneedle,inparticular,refertotheexplanation
tablein“Replacementoftheneedle”.
Iftheneedleorthreaddoesnotmatchthematerialusedsuchasinthecasethatanextraheavy-
weightmaterial(e.g.,denim)issewnwithathinneedle(#11orhigher),theneedlecanbreakresult-
inginanunexpectedpersonalinjury.
Other precautions
●Donotputthesewingmachineunderthe
directsunlightorinahumidplace.
Beawarethatthefollowingstatecantakeplacesincethesewingmachineincorporatessemi-con-
ductorelectronicpartsandpreciseelectroniccircuits.
*Theoperatingtemperatureofthesewingmachineisbetween5ºCand40ºC.Donotusethe
sewingmachineunderthedirectsunlight,neartheburningthingssuchasastoveandcandle,or
inahumidplace.Bysodoing,thetemperatureintheinteriorportionofthesewingmachinecan
riseorthecoatingofthepowercordcanmelt,causingreorelectricalshock.
LEDlight
・
RatedVoltage:9V
・
Maximumpowerconsumption:1.3W
3

Safety instructions ·································· 1-3
Contents··················································4
Details of the machine····························· 5,6
• Accessories···········································6
Preparing the machine ·······························7
• Foot control ···········································7
• Thread stand ·········································8
• Thread, cones, spools ·····························8
Using the machine
• Main switch ···········································8
• Presser foot lifter ····································8
• Changing the presser foot ························9
• Looper cover ·········································9
• Cloth plate ············································9
• Handwheel·········································· 10
• Raising the upper knife ·························· 10
• Inserting the needles ····························· 11
• Needles and machine···························· 11
Threading
• Preparation ········································· 12
• Upper and lower looper ·····················13-15
• Right and left needles························16,17
Trial sewing
• Sewing test ········································· 18
• Thread tension····································· 19
• Adjusting tensions································· 19
Contents
Adjustments and settings
• Stitch length ········································ 20
• Cutting width ······································· 20
• Differential feed···································· 21
• Gathering············································ 22
• Upper looper converter ·························· 23
• Roll hemming ······································ 23
• Presser foot pressure ···························· 24
Practical sewing
• Thread breakage ·································· 24
• Unpicking seams ·································· 24
Stitch chart············································· 25
Maintenance
• Replacing the knives ····························· 26
• Cleaning and lubricating························· 26
Trouble shooting guide ····························· 27
Technical data ········································ 28
Optional accessories································ 29
4

Details of the machine
1. Presser foot lifter
2. Stitch plate
3. Presser foot
4. Upper knife
5. Needle clamp
Details of the machine
MO-114DN
MO-104DN
Details of the machine
1. Looper cover with built in knife guard
2. Looper cover opening indent
3. Cloth plate
4. LED light
5. Thread take-up cover
6. Foot pressure adjusting screw
7. Left needle thread tension lever
8. Right needle thread tension lever
9. Upper looper thread tension lever
10. Lower looper thread tension lever
11. Retractable support rod
12. Thread guide support
13. Open thread guide
14. Spool holder pin
15. Foam pad
16. Anti-vibration cone
17. Thread stand
18. Stitch length adjustment dial (MO-114DN)
19. Differential feed adjustment dial (MO-114DN)
20. Handwheel
21. Rear cover
22. Machine socket
23. Power/Light switch
24. Differential feed adjustment knob (MO-104DN)
24
12
23
22
20
2119
18
17
16
14
15
3
5
6
789
10
11
12 13
4
12
23
22
20
21
17
16
14
15
5
6
789
10
11
12 13
3
4
5

Details of the machine
View with looper cover open
1. Selection lever for overlocking or rollhemming
2. Lower knife
3. Lower looper auto threader (MO-114DN)
4. Lower knife set screw
5. Lower looper
6. Upper looper
View with cloth plate open
1. Cutting width adjustment knob
2. Stitch length adjustment knob (MO-104DN)
3. Differential feed adjustment knob (MO-104DN)
Accessories
1. Electronic foot control
2. Upper looper converter *
3. Spool caps
4. Tweezers
5. Cleaning brush/Needle inserter
6. Nets
7. Looper threader **
8. Needle set 130/705H
9. Small screwdriver
10. Oiler
11. Accessory bag
12. Dust cover
* Optional for MO-104DN
** Only for MO-104DN
6
1
2
5
4
3
Caution
Be sure to turn off the power
switch before opening the looper
cover.
6

Attaching the foot control
Plug foot control into the machine socket (A) and then into the main
socket (B). The foot control regulates the sewing speed. The sewing
speed can be adjusted by increasing or decreasing the pressure on
the foot control.
“WARNING”
This appliance has a polarised plug (one blade wider than the oth-
er). To reduce the risk of electrical shock, this plug is intended to t
into a polarised main socket only one way. If the plug does not t
fully in the polarised main socket, reverse the plug. If it still does not
t, contact a qualied electrician to install the proper polarised main
socket. Do not modify the plug in any way. (for USA, Canada only).
* Use only the foot control model YC-482 (USA, Canada), YC-483N
(220-240V).
Polarized power
supply socket
Polarized For UL, CSA
CAUTION:
Be sure to turn OFF the power switch before plugging/unplug-
ging the controller.
Preparing the machine
Thread stand
Push the support rod rmly into the socket on the back of the
machine. Raise the support rod (C) fully, turning slightly until the po-
sition catches engage. Position the thread guide (D) on the thread
stand so that the arrow is to the front.
7

Thread / cones / spools
The anti-vibration cone should
be used with the wider edge at
the bottom on the spool holder
pin when sewing with cones.
Large spools
If large industrial spools are used,
position the anti-vibration cone up-
side down on the spool holder pin,
i.e. with the wider edge at the top.
Household spools
Remove the anti-vibration
cones. Place spools on spool
holder pins and push the spool
caps on with the rounded side
downwards.
Thread nets
If the threads slip and gets twist-
ed, cover the spools of upper and
lower looper with the nets supplied
in the accessory bag.
Using the machine
Power/light switch
The power/light switch is conveniently placed on the handwheel side of
the machine in front of the socket.
O = Off
I = On with light
Two step presser foot
To raise the presser foot, lift the presser foot lever on the rear of the
machine, until it engages (A). It can be raised again to the maximum
height and held in this position to provide more space between presser
foot and stitch plate.(B).
Note: When the presser foot is raised, all the tensions are released
making it easier to thread the machine.
“WARNING”
When using the extra lift (B), do not run the machine or turn the hand-
wheel.
Preparing the machine
CAUTION:
Perform these following steps when you are not using your sewing
machine.
1. Be sure to turn OFF the power switch.
2. Be sure to remove the power plug from the wall outlet.
3. Do not place a thing on the foot controller.
8

Using the machine
Changing the presser foot
• Switch the machine off (Power switch to “0”).
• Raise the presser foot.
• Turn the handwheel towards you until needles are fully raised.
Press the catch (C) to release the presser foot from the clamp. Raise
the presser foot to the highest position (B) and remove the presser
foot to the left. To attach the presser foot, place it under the shaft. The
groove in the shaft should line up exactly with the presser foot pin (D).
Lower the shank and the presser foot will engage automatically.
Looper cover
To open the looper cover press the indent to the right with your thumb
and lower the cover towards you. To close, push it up and press lightly
to the right. The cover engages automatically.
CAUTION: Moving parts - to reduce the risk of injury, switch ma-
chine off (“O”). Before servicing and when opening
looper cover and cloth plate. Close before using!
Cloth plate cover
Opening and closing the cloth plate:
Opening: Push the cloth plate to the left.
Closing: Push the cloth plate to the right.
CAUTION: Moving parts - to reduce the risk of injury, switch ma-
chine off (“O”). Before servicing and when opening
looper cover and cloth plate. Close before using!
9

Using the machine
Handwheel
The handwheel turns forward, i. e. in the same direction as on a house-
hold sewing machine.
G
Raising the upper knife
• Switch the machine off (Power switch to “0”).
• Disconnect machine from electricity supply.
• Turn the handwheel towards you until needles are fully raised.
• Open the looper cover.
Press the upper knife holder (E) to the right. Turn the knob clockwise (F)
until the knife engages into position as illustrated (G).
10

Inserting needles
Needles can be inserted quickly and easily with the practical cleaning
brush and needle inserter (A).
• Switch the machine off (Power switch to “0”).
• Disconnect machine from electricity supply.Turn the handwheel to-
wards you until needles are fully raised.
• Lower the presser foot.
Using the small screwdriver, loosen the needle setscrews and remove
the needles (B). Place the right hand needle, flat side towards the
back, into the hole of the needle inserter and insert the needle as far
as possible into the needle clamp. Tighten the setscrew lightly and then
insert the lefthand needle in the same way and tighten both setscrews
(C).
Using the machine
Needle and machine
Your overlock machine is equipped with needle system 130/705 H
(household sewing machine needles). These should be purchased
when replacement needles are required. Use needles no. 70 - 90 on
your machine.
11

Using the machine, Threading
Preparation / Tips
• Switch the machine off (Power switch to “0”).
• Disconnect machine from electricity supply.
• Support rod with thread guide must be fully raised.
• Open looper cover and cloth plate.
• Turn the handwheel towards you until the needles are fully raised.
• Raise the upper knife.
• Raise the presser foot. The tension is automatically released.
Thread the machine carefully and in the correct sequence.
Invaluable threading aids simplify threading:
• Colored threading illustration
• Color coded thread path on the machine
• Threading accessories
First thread guide on the Machine
Take the thread with both hands and lay it in the groove.
Press the thread down into the 1st guide on the machine until
it clicks into place.
12

Threading
1. Upper looper thread, blue markings
Place the spool on the spool holder pin as illustrated.
(1) Bring the thread up from the spool and lay it from
back to front into the guide (second from right).
(2) Take the thread with both hands and lay it in the
groove. Press the thread down into the 1st guide on
the machine until it clicks into place.
(3) Slip the thread through the groove.
(4,5,6,7,8) Thread the guides, blue markings.
(9) Turn the handwheel until the upper looper is in the po-
sition as illustrated. Thread the looper eye.
(10) Lift the presser foot, place thread underneath and
lower the presser foot.
Note:
Do not thread the upper looper when sewing with the up-
per looper converter.
MO-114DN
MO-104DN
13

Threading
2. Lower looper thread, red markings
Place the spool on the spool holder pin as illustrated.
(1) Bring the thread up from the spool and lay it from
back to front into the guide (right one).
(2) Take the thread with both hands and lay it in the
groove Press the thread down into the 1st guide on
the machine until it clicks into place.
(3) Slip the thread through the groove.
(4,5,6,7) Thread the guides.
(8) Turn the handwheel to bring the looper to its left most
position. Make a thread loop with your right hand. Use
the looper threader to catch the thread loop from the
left and insert the loop from back to front into the slit
on the lower looper. Pull and hold the thread to the
right. Turn the handwheel to bring the looper to the
right side.
(9) Thread the lower looper eye.
(10) Place the thread under the presser foot.
Note:
If the lower looper has to be re-threaded, cut both needle
threads off at the needle and remove surplus thread from
below. Thread the lower looper and then re-thread the
needles.
MO-104DN
14

Threading
2. Lower looper thread, red markings
Place the spool on the spool holder pin as illustrated.
(1) Bring the thread up from the spool and lay it from the
back to the front into the guide (right one).
(2) Take the thread with both hands and lay it in the
groove. Press the thread down into the 1st guide on
the machine until it clicks into place.
(3) Slip the thread through the groove.
(4,5,6) Thread the guides.
(7) Press the lever of the auto threader down.
(8,9) Thread the guide and then the slit on the threader.
Push the auto threader lever up to return it to its
normal position.
(10) Thread the lower looper eye and place the thread un-
derneath the presser foot.
Note:
If the lower looper has to be re-threaded, cut both needle
threads off at the needle and remove surplus thread from
below. Thread the lower looper and then re-thread the
needles.
MO-114DN
15

Threading
3. Right-hand needle, green markings
• Switch the machine off (Power switch to “0”).
Place the spool on the spool holder pin as illustrated.
(1) Bring the thread up from the spool and lay it from
back to front into the guide (second from left)
(2) Take the thread with both hands and lay it in the
groove. Press the thread down into the 1st guide on
the machine until it clicks into place.
(3) Slip the thread through the groove.
(4,5) Take the thread under the thread guide plate to the
left and through the take up.
(6) Thread the guide.
(7) Thread the guide on the needle clamp.
(8) Turn the handwheel towards you until the needles
are fully raised. Thread the right hand needle front to
back.
(9) Place the thread under the presser foot.
Note:
If the lower looper has to be re-threaded, cut both needle
threads off at the needle and remove surplus thread from
below. Thread the lower looper and then re-thread the
needles.
16

Threading
4. Left-hand needle, yellow markings
• Switch the machine off (Power switch to “0”).
Place the spool on the spool holder pin as illustrated.
(1) Bring the thread up from the spool and lay it from
back to front into the guide (left one).
(2) Take the thread with both hands and lay it in the
groove. Press the thread down into the 1st guide on
the machine until it clicks into place.
(3) Slip the thread through the groove.
(4,5) Take the thread under the thread guide plate to the
left and through the take up.
(6) Thread the guide.
(7) Thread the guide on the needle clamp.
(8) Turn the handwheel towards you until the needles are
fully raised. Thread the left hand needle front to back.
(9) Place the thread under the presser foot.
When threading is complete, lower the upper knife, close
the looper cover and cloth plate.
Note:
If the lower looper has to be re-threaded, cut both needle
threads off at the needle and remove surplus thread from
below. Thread the looper and then re-thread the needles.
17

Trial sewing, Thread tension
Sewing test
After threading make a trail run. Always use a double layer of
fabric to properly check the stitch formation and thread ten-
sion.
• Switch the machine on (“I”).
• Set all tensions to 4.
• Stitch length, differential, cutting width (see adjustment &
settings).
• Lower the upper knife.
• Lower the presser foot.
• Raise the front of the presser foot slightly with your thumb
and position the fabric under the foot just up to the knife.
Sew.
• At the end of the seam continue sewing a 8cm (3”) long
thread chain (A). Cut threads.
• When using thread such as cordonet or similar, pull out the
thread chain (B) carefully by hand as it might catch in the
stitch plate.
Check your trial run
1. Upper looper thread (blue).
2. Lower looper thread (red).
3. Right- hand needle thread (green).
4. Left- hand needle thread (yellow).
Perfect stitch formation is when both looper threads meet at
the fabric edge. The needle threads form straight stitches for
a stretchy and durable seam.
18

Trial sewing, Thread tension
Thread tension
Thread tension should be adjusted to suit the various types of work.
The ideal thread tension for most fabrics and threads is between 3 and 5.
However this can vary quite considerably when special threads such
as filament, woolly nylon, buttonhole twist (cordonet), pearl yarn or
decorative threads are used. Infinitely variable adjustments can be
made from 1-9. Move the lever upwards for more tension, move the le-
ver downwards for less tension.
A
B
C
D
E
F
Adjusting the thread tension
Lower or raise the tension levers by only half or one number, then test
sew again and check the result.
• The loops are formed on the underside:
Tighten the upper looper thread tension, (blue) or loosen the lower
looper thread tension, red (A).
• The loops are formed on the upper- side:
Tighten the lower looper thread tension, (red) or loosen the upper
looper thread tension, blue (B).
• The right- hand needle thread forms loops on the underside:
Tighten the right- hand needle thread tension, green (C).
• The left- hand needle forms loops on the underside:
Tighten the left- hand needle thread tension, yellow (D).
• The edge of the fabric curls up, tension for both looper threads is too
tight:
Loosen upper and lower looper thread tension, blue and red (E).
• The fabric puckers during sewing:
Loosen the right- or left-hand needle thread tension, green or yellow
(F).
19