2-Needle,3/4-Thread Overlock Sewing Machine

MO-50e/51e
Instruction Manual

IMPORTANT:
Read all safety regulations carefully and
understand them before using your sewing
machine.
Retain this instruction manual for future reference.

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 110V~240V/15W.

20. Close cover before operating machine.

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 Contents

1. Safety regulations
Replace bulb with same type rated 15Watts. 5. Contents
7. Details of the machine
Use foot controller 7. - Details of the machine
9. Preparing the machine
4C-315A221 Foot controller (100v) Japan 9. - Accessories
9. - Accessory Box
4C-316B22 Foot controller (115v) U.S.A. 9. - Looper cover
4C-326C22 Foot controller (220v) South Africa 9. - Waste collector
4C-316C24 Foot controller (220v) Argentina 11. - Attaching the foot control
4C-316C26 Foot controller (220v) Korea 11. - Sewing speed
11. - Assembling the thread stand
4C-316C28 Foot controller (220v) the Middle East
11. - Thread cones
4C-326G22 Foot controller (230v) Europe 11. - Power/ light switch
4C-326C25 Foot controller (240v) U.K.
4C-326C23 Foot controller (240v) Australia 13. Using the machine
13. - Handwheel
13. - Presser foot lifter
13. - Changing the presser foot
15. - Inserting needles
15. - To lower the upper knife

17. Threading
17. - Threading/ Preparation
17. - Upper looper (Blue)
19. - Lower looper (Red)
21. - Right needle (Green)
23. - Left needle (Yellow)
23. - After threading
25. Trial sewing, thread tension
25. - Sewing test
25. - Check your trial run

27. Adjusting the thread tension

27. - Adjusting the thread tension

29. Adjustments and settings

29. - Stitch length
29. - Cutting width

31. Differential feed*

31. - Differential feed*
31. - Gathering*

33. Practical sewing

- 3 thread overlock
- 3 thread rolled hem
- Unpicking seams

35. Maintenance
- Changing light bulb
- Cleaging and lubricating

37. Trouble shooting guide

41. Technical data
2

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 Details of the machine

8
7 22 Details of the machine
9
21 1 Looper cover
10 12 2 Looper cover opening indent
3 Knife guard
11 4 Cloth plate
20 5 Stitch plate
6 Presser foot
19
7 Upper looper tension dial
18 8 Lower looper tension dial
4
24 9 Right needle tension dial
10 Left needle tension dial
16 11 Thread take up cover
12 Thread guide plate
13 Accessory box
17
14 Bulb cover
1 15 Power / light switch
15
16 Handwheel
17 Machine socket
2 18 Thread stand
19 Anti-vibration cone
20 Spool holder pin
21 Retractable support rod
22 Open thread guide
23 Presser foot lifter
24 Stitch length dial
25 Differential feed dial
14

23 3
6
4
25

13
5

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 Preparing the machine

Accessories
1 2 3

1 Screwdriver
2 Tweezers
3 Cleaning brush
4 Set of needles ELX705
4 5 6 5 Net
6 Spool caps
7 Waste collector
8 Hexagon wrench
9 Upper knife
8 9 10 Oiler

Accessory Box
All standard accessories are stored
in the box. Pull out to open.
Push in to close.

Looper cover
To open, push to the right with your thumb
in the indent and tilt towards you.
To close push it up and the cover engages
automatically.

Waste collector
Fabric waste will be collected as you sew.
Push the waste collector under the front of the
machine and slightly to the left towards the cloth
plate cover.

Cloth plate cover

To open push the lever up.

To close push the cover up to the
right, it snaps into position
automatically.

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 Preparing the machine

B
Attaching the foot control
Plug foot control into machine socket (A)
and then into main socket (B).

Sewing speed
The sewing speed can be adjusted by
increasing or decreasing the pressure
on the foot control (C).

Assembling the thread stand

Raise the support rod fully, turning slightly
until the positioning catches engage.

Thread cones
The anti-vibration cone should be used with the
wider edge to the bottom on the spool holder
pin when sewing with cones.
When using household spools remove the
anti-vibration cones.
Place spool on spool holder pins and push
the spool caps on.
If threads slip and get twisted, cover the spools
with the nets supplied in the accessory box.

OFF Power/light switch

O The power switch is conveniently placed on the
ON handwheel side of the machine.
I
"I" - ON
"O"-OFF

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 Using the machine

Handwheel
The handwheel turns counterclockwise.

Presser foot lifter

To raise the presser foot, raise the lever
on the rear of the machine until it engages.

Changing the presser foot

-Switch the machine off " O ".

A -Raise the presser foot.
Press the catch (A) to release the presser
foot from the clamp.
Raise the presser foot lifter to the highest
position and remove the presser foot sole
to the left.
To attach the presser foot sole, place it under
the shaft. The groove in the shaft should line
up exactly with the presser foot pin.
Lower the shank and the presser foot will
engage automatically.

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 Using the machine

Inserting needles
- Switch the machine off " O ".
Disconnect machine from electricity supply.
- Turn the handwheel until needles are fully
raised.
- Lower the presser foot.
- Use the hexagon wrench to loosen the
needle setscrew. Remove needle.
- Insert the needle flat side towards the back,
as far as possible into the needle clamp.
Tighten the screw.
- The left needle is set higher than the right
needle.

Raising the upper knife

- Turn the handwheel to raise the needles.
- Open the looper cover.
- Press the upper knife holder to the right.
Turn the knob clockwise until the knife
engages.
- Close the looper cover.

To lower the upper knife:

- Turn the knob anti-clockwise.
The knife snaps automatically into its
lower position. Close the looper cover.

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 Threading

4 3 1 2

Threading / Preparation
- Disconnect machine from
electricity supply.
- Support rod with thread guide
must be fully raised.
- Open the looper cover and the
cloth plate cover.
- Turn the handwheel towards you
until needles are fully raised.

- Thread the machine in the correct

sequence.

Upper looper (Blue)

- Place the spool on the spool
holder pin.
- Bring thread up from back to front
through guide (1).
- Pull the thread under the
guider (2) up to go around the
pre-tension (3).
- Thread guide (4,5,6).
- Thread looper eye (7).

6
1
4

2
7

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 Threading

Lower looper (red)

- Place the spool on the

spool holder pin.
- Bring thread up from back to front
through guide (1).
- Pull the thread under the
protector (2) and pass under the
guider up to go around the
pre-tension (3).
- Thread guide (4,5,6).
- Turn the balance wheel
toward you until the lower
looper extending out
5-10mm from the needle
plate edge.
- Pull the thread
5~10mm
with tweezers to pass the
1
lower looper hole (A).
- Draw the thread with your left
hand tightly.
- Use your finger to push the
automatic threader (B) up to the
topmost, and then thread goes
through the lower looper ( C )
automatically.
2 A

6 C

4
5 B

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 Threading

Right needle (Green)

- Place the spool on the

spool holder pin.
- Bring thread up through
guide (1).
- Pull the thread under the
protector (2) and pass under the
guider up to go around the
pre-tension (3)
- Thread guide (4,5).
- Thread right needle eye (6)
- Place thread under presser foot.

1 5

10

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 Threading

Left needle (Yellow)

- Place the spool on the

spool holder pin.
- Bring thread up through guide (1).
- Pull the thread under the
protector (2) and pass under the
guider up to go around the
pre-tension (3).
- Thread guide (4,5).
- Thread left needle eye (6)
- Place thread under presser foot.

After threading

1 5 When threading is complete, lower

the presser foot and 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 eye and remove
surplus thread from below. Thread
2
the looper and then re-thread the
needles.

11

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 Trial sewing, thread tension

Sewing test

After threading make a trial run.

Always use a double layer of fabric
in order to be able to check the
stitch formation and thread tension
properly.

- Switch the machine on "I".

- Set all tension dials to 3.
- 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 (4") long thread
chain.
- Cut the thread chain and remove
work.

Check your trial run

2

1 Upper looper thread (blue)

2 Lower looper thread (red)
3 Right needle thread (green)
4 4 Left needle thread (yellow)

Perfect stitch formation is when

3
both looper threads meet at the
1 fabric edge. The needle threads
form straight stitches for a stretchy
and durable seam.

Thread tension adjustments may

be required depending on the type
of fabric and thread being used.

12

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 Adjusting the thread
tension

Adjusting the thread tension

The left needle thread forms

loops on the underside:
Tighten the left needle thread
tension (yellow).

The right needle thread forms

loops on the underside:
Tighten the right needle thread
tension (green).

The looper loops are formed on

the underside:
Tighten the upper looper tension
(blue), or loosen the lower looper
tension (red).

The looper loops are formed on

the upper side:
Tighten the lower looper
tension (red), or loosen the upper
looper tension (blue).

13

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 Adjustments and settings

Stitch length

- The stitch length can be adjusted

from 1 to 4 mm.

3
N
2 - Higher number = longer stitch,
lower number = shorter stitch.
- Basic stitch length = N.

Cutting width
- The cutting width should be
adjusted according to the type of
fabric being sewn. Check the seam
each time and adjust the cutting
width accordingly.

Adjusting the cutting width:

- Open cloth plate cover

- Turn cutting width dial:
- Clockwise to move knife to the left
(for heavier fabrics).
lever
- Counter-clockwise to move the
knife to the right (for lighter fabrics).

How to use the needle plate

Switch the lever to select the

regular or rolled hem and narrow
hem sewing. “N" for regular sewing.
"R" for rolled and narrow hem
lever sewing.

14

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 Differential feed*

Differential feed*

8
7
6 5 4
3 There are two feed dogs: one front and one

2
rear. The two feed dogs move independently

1
N and the distance each feed dog travels
1
2
5
4
3 during one complete movement can be
adjusted.

Stretching effect
To stretch the fabric select a number
from N to 5 in the
section " ".
This prevents fine nylon jerseys or
closely woven fabrics from
puckering.

Pushing effect
To prevent waving or to gather
select a number from N to 8 in the
section " ".
This prevents waving or fluting in
knits or puckers in fine woven
fabrics. It also can be used to
gather single layers of fine woven
fabric.

Note:
When sewing without differential
feed the dial should be on
position N.

Gathering*
Use the differential feed to gather
a single layer of fabric. For example
sleeve heads, yokes, lace edging
or frills.

Adjustment:
Stitch: 4-thread overlock
Differential
feed: 8
Stitch length: 3-4
Thread tension: 3-5

15

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 Practical sewing

3 thread overlock

For a 3-5 mm wide 3 thread

overlock, remove the left needle.
Thread both loopers and then
the right needle.

For a 5-7 mm wide 3 thread

overlock, remove the right
needle.
Thread both loopers and then
the left needle.

3 thread roll hem

Switch the lever to "R". See

page 14.

Note:
the tensions may need to be
adjusted depending on the type
of fabric or thread being used.

Setting:

Stitch: 3 thread roll hem

Needle: right
Tensions:
Needle: 3-5
Upper looper 4-6
Lower looper 6-8
Stitch length 1.5-2
Differential feed N (depending on fabric)

Unpicking seams
Cut the loops with sharp
scissors.
Pull the needle thread and the
stitches will come undone.

16

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 Changing light bulb

 - Switch the machine off "O" and

 OFF disconnect it from electricity supply
O by removing the mains plug.
ON
- Loosen the bulb cover setscrew (A)
I and remove the bulb cover.
- Unscrew the bulb and replace it with
a new one.
- Attach bulb cover and re-tighten the
setscrew.

A If voltage indicated on the electrical

rating plate of your machine is 100V,
ask for light bulb conforming to
following specification.
-Edison type (screw type):
100V, 12W
Glass shape: T-20
If voltage indicated on the electrical Lamp cap: E12
rating plate of your machine is Overall length: 48mm
220-240V, ask for light bulb conforming If voltage indicated on the electrical
to following specification. rating plate of your machine is
-Edison type (screw type): 110-120V, ask for light bulb conforming
220 ~240V, 15W to following specification.
Glass shape: T-22 -Edison type (screw type):
Lamp cap: E14
Overall length: 56mm 110 ~120V, 15W
Glass shape: T-20
Note: Lamp cap: E12
Overall length: 48mm
Always use 110V/230V/240V/
15W bulbs. Bulbs are available
from your local dealer.

Cleaning and lubricating

- Disconnect machine from electricity
supply.
During sewing dust and fluff collect in
and on the machine. This should be
removed regularly.
Your overlocker requires very little
lubrication but if used frequently,
lubricate the points illustrated (B) with
a drop of oil.

17

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 Trouble shooting guide

Thread breaks Thread tension is too tight Reduce thread tension. 13

for thread used.
The machine is not threaded Check the threading. 8
correctly.
Needles are incorrectly Insert needles fully into needle 9/10
inserted. clamp with flat side to the back. 7

Needles break Needles are bent, blunt or the Replace the needles. 7
points are damaged. Insert needles fully into 7
Needles not inserted needle clamp with flat side
correctly. to the back.
Fabric was pulled while sewing. Guide fabric gently with both 12
hands.

Skipped stitches Needles are bent or blunt. Replace the needles.

Wrong needles used. Use system ELx705 7
needles.

Poor stitch formation Thread is not wound correctly Check threading. 8

round tension dials. 9/10

Seams flute or ware (knits) Differential feed is set incorrectly. Adjust differential feed 15
Fabric was pulled while sewing. between N and 8 " "

Seams pucker Differential feed is set incorrectly. Adjust differential feed 15

between N and 5 " "

Fabric edges curl Too much fabric in the stitch Reduce cutting width, knife 14
formation. to the left.

Thread loops are loose Too little fabric in the stitch Increase the cutting width, 14
formation. knife to the right.

Machine does not sew Cord not plugged in correctly. Check plug. 5
Main switch not on. Switch machine on " 1 ".

18

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 Technical data

Stitch types: Handwheel:

- 2 needles, 4 thread overlock with integrated rotates counter-clockwise
safety seam Sewing speed:
- 1 needle. 3-thread overlock, 3 thread rollhem. up to 1300 s.p.m.
Needle system: Weight:
ELX705 7.4kg
Seam width: Dimensions:
3-7mm 292Wx295Dx290H mm
Stitch length:
1-4mm
Presser foot lift:
max. 6mm

Standard accessory:
Dust cover

Special accessories:

Blind stitch foot

Elasticator foot

Shirring foot

Bead/sequin foot

Cording foot

Taping foot

Special accessories are

available from your dealer

19

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 The product in this manual fulfil the demands in below norms:

72/23 EEC
89/336 EEC
89/392 EEC

Please pay attention on the needle area: The needle area can not be completely protected, as a
totally protection will spoil the fundamental function of the overlock machine.

Great caution should be shown when working in the needle area. It is recommended to discon-
nect the overlock machine by remove plug from outlet when changing needle, bulb or when
other work in the needle area is required.

The right to change in construction and specification reserved.

20

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 RECYCLING

Do not dispose of electrical appliances as unsorted municipal waste. Use separate collection
facilities.

Contact your local government for information regarding the collection systems available.

If electrical appliances are disposed of in landfills or dumps, hazardous substances can leak
into the groundwater and get into the food chain, damaging your health and well-being.

When replacing old appliances with new one, the retailer is legally obligated to take back
your old appliance for disposal at least for free of charge.

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 JUKI CORPORATION
2-11-1, Tsurumaki,
Tama-shi, Tokyo 206-8551, JAPAN
PHON: (81)42-357-2341
FAX: (81)42-357-2379
Copyright © 2012 JUKI CORPORATION.
All rights reserved throughout the world.
40131848 E1P16
000912
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