JUKI MO-735N User manual

MO-735N
2-Needle,2/3/4/5-Thread Overlock + Cover Stitch Sewing Machine
IMPORTANT:
Read all safety regulations carefully and under-stand
them before using your sewing machine. Retain this in-
struction manual for future reference.
INSTRUCTION MANUAL
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
machine. 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 o󰀨 “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 o󰀨 “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 supply cord is damaged, it must be replaced by the manufacturer, its service agent or sim-
ilarly qualied persons in order to avoid a hazard.
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 warning
which is not speci-
ed
There is a risk of
electrical shock
There is a risk
of re
There is a risk of
injury to hands,
etc.
Prohibited matter
which is not speci-
ed
Disassembly/
alteration is pro-
hibited
Do not place
ngers under
the needle
Do not pour oil,
etc.
Generally required
behavior
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 di󰀨erent 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 o󰀨 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 / Using the machine ·······7-8
• Attaching the foot control································7
• Waste collector ············································7
• Thread stand ···············································8
• Placing the spool holder for the chain thread ······8
• Thread / cones / spools··································9
Using the machine
• Power/light switch·········································9
• Raising the upper knife ··································9
• Two step presser foot lifter with integrated front
foot lift······················································10
• Changing the presser foot ···························· 10
• Looper cover ············································· 11
• Cloth plate ················································ 11
• Handwheel················································ 11
• Inserting the needles ··································· 12
Needle and thread·········································13
Adjustments and settings
• Stitch length ··············································14
• Cutting width ·············································14
• Di󰀨erential feed·········································· 15
• Gathering··················································16
• Upper looper converter ································ 16
• Roll hemming ············································17
Settings, practical sewing
• Presser foot pressure ·································· 17
• Sewing in tape ··········································· 18
• Thread breakage during sewing····················· 18
• Unpicking seams ········································18
Threading preparations / tips ···························19
Stitch chart·············································· 20-21
Threading 4/3 Thread OL
• Upper looper ·············································22
• Lower looper ·············································23
• Right-hand needle ······································24
• Left-hand needle ········································25
Threading, Chain stitch and OL ··················· 26-28
Contents
Trial sewing, thread tension ·····························29
Thread tension ········································ 29-30
Cover/chain stitch functions·····························31
Cover/chain stitch functions and
general operating instructions ····················· 32-33
Threading 4 thread cover stitch
• Threading cover stitch looper ························34
• Cover stitch R needle ·································· 35
• Cover stitch C needle ·································· 36
• Cover stitch L needle··································· 37
Threading 3 thread cover stitch (wide) ···············38
Threading 3 thread cover stitch (narrow) ············39
Threading chain stitch ····································40
Sewing test and tension adjustment ··················41
Tension adjustments ······································42
Practical Sewing-Cover stitch
• Securing the seam end, cover stitch ···············43
• Unpicking seams ········································43
• Stitch plate with seam guide lines ·················· 43
• Simple hem ···············································44
• Flat joining seam ········································ 44
• Edges with elastic······································· 45
• Binding·····················································45
Top stitching seams /ribbing/yokes····················46
Practical Sewing-Chain stitch
• Gathering with chain stitch···························· 46
• Binding·····················································46
Maintenance
• Changing the upper knife ····························· 47
• Changing the lower knife······························ 47
• Cleaning and lubricating······························· 47
Trouble shooting guide ···································48
Technical data ··············································49
Optional Accessories ·····································50
4

View with looper cover open
Details of the machine
Selection lever for overlocking or roll hemming
Lower knife
Cutting width adjusting dial
Lower looper auto threader
Lower looper
Upper looper
Threading diagram
Slit type looper threading system
Lower knife setscrew
Looper cover with built in knife guard
Looper cover opening indent
Cloth plate
LED light
Thread take-up cover
Presser foot pressure regulating knob
Left needle thread tension dial
Right needle thread tension dial
Upper looper thread tension dial
Lower looper thread tension dial
Retractable support rod
Thread guide support
Foam pad
Anti-vibration cone
Thread stand
Stitch length adjustment dial
Di󰀨erential feed adjustment dial
Handwheel
Side cover
Matching up marks
Machine socket
Power/Light switch
Knife guard
Open thread guide
Spool holder pin
Thread cutter
Presser foot lifter
Stitch plate
Presser foot
Upper knife
Needle clamp
Details of the machine
CAUTION :
Be sure to turn o󰀨 the power switch
before opening the looper cover.
5

Accessories
View with cloth plate open
Needle set 130/705H (SCHMETZ)
Small screwdriver Tweezers
Upper looper converter
Needle threader
Brush/needle inserter
Chain-looper auto-threader
Chain-looper thread tension dial
Threading diagram for chain-looper thread
Cover/chain stitch
extension plate
Spool holder
Electronic foot control
Nets
Oiler Large screwdriver
Spool caps
Dust cover
Accessory bag
Cover stitch
presser foot
Lower knife
Waste collector
Details of the machine
Needle set JL×2 (3×No.80)
6

Preparing the machine / Using the machine
Attaching the foot control
Plug foot control into the machine socket (A) and then into 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.
A
B
Waste collector
Clip the waste collector into the opening on the looper cover. It
catches the cut-off fabric as you sew, keeping your working area
neat and tidy.
CAUTION :
Be sure to turn OFF the power switch before plugging/un-
plugging the controller.
7

Preparing the machine / Using the machine
Thread stand
Push the support rod firmly into the socket on the back of the ma-
chine.
Raise the support rod (C) fully, turning slightly until the position
catches engage. Position the thread guide (D) on the thread stand
so that the arrow is to the front.
Placing the spool holder for the chain thread
Lift the foam pad (A), slide the guide tabs (C) of the spool holder (B)
into the guide of the upper side of the spool holder from left to right
into position (E) and press until tab (D) clicks into the underside of
rib. (F)
CD
DC
A
B
FE
DC
FE
8

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
upside 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 net
If the threads slip and get twisted,
cover the looper spools with the
net supplied in the accessory bag.
Preparing the machine / Using the machine
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
Raising the upper knife
Switch the machine o󰀨 (power switch ”O”)
• Turn the handwheel towards you until the 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 is in the position illustrated (G).
E
F
G
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.
9

Using the machine
Two step presser foot lifter with integrated front foot lift
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).
When the foot is raised A and B, the front of the foot is automatically lifted.
Note:
When the presser foot is raised, all the tensions are released making it easier
to thread the machine.
Changing the presser foot
Switch the machine o󰀨 (power switch”O”)
• Raise the presser foot.
• Turn handwheel towards you until needles are fully raised. Match the match-
ing up marks on handwheel and side cover.
Press the catch (C) to release the presser foot from the clamp. Raise the press-
er foot shank 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.
(E) Standard foot
(F) Cover stitch presser foot
Adjusting the presser foot (G)
When making seams on swim, gymwear or similar material, this with the cover-
stitch, shift the lever to the rear, presser foot pressure on L.
For normal use shift the lever to the front side.
C
D
A
B
EF
G
WARNING :
When using the extra lift (B), do not run the machine or turn the hand-
wheel.
10

Looper cover
To open, press to the right with your thumb in the indent provided and
tilt the cover towards you. To close push it up and press lightly to the
right.
The cover engages automatically.
Safety switch: The machine does not run when the looper cover is
opened.
Cloth plate
Opening and closing the cloth plate
Opening: Push the cloth plate to the left.
Closing: Push the cloth plate to the right.
Safety switch: The machine does not run when the cloth plate is
opened.
Handwheel
The handwheel turns forward, i.e. in the same direction as on a
household sewing machine.
Using the machine
CAUTION :
For safety, the power is automatically cut o󰀨 when you open
the looper cover or the cloth plate.
CAUTION :
For safety, the power is automatically cut o󰀨 when you open
the looper cover or the cloth plate.
11

Using the machine
Inserting the needles
Needles can be inserted quickly and easily with the practical needle
inserter (A).
Switch the machine o󰀨 (power switch ”O”)
Disconnect machine from electricity supply.
Turn handwheel towards you until needles are fully raised. Match the
matching up marks on handwheel and side cover.
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 left-hand
needle in the same way and tighten both setscrews (C).
A
C
B
12

Needle and thread
Thread/decorative threads
Sewing and special overlock threads are manufactured in a wide variety of types, weights and combination of fibres. It
is worth investing in good quality threads for perfect sewing results. Decorative threads specially made for overlockers
(available on cones) are also becoming widely available. We recommend following the basic guidelines when using
special threads on your overlocker:
- Purchase threads on cones or spools which are produced exclusively for overlocking.
- When using normal spools, use the spool caps (in accessory bag).
- Only use decorative threads in the loopers. The thread must move easily and without resistance through the thread
guides and looper eyes.
- The thicker the thread, the longer the stitch length (3-4).
- The thicker the thread, the looser the tensions
- Sew slowly when using decorative threads. Pull the thread chain gently to the rear when starting to sew.
Always test sew decorative threads before starting to sew your work.
Thread, needle, application table
Thread Needles Where Application
All purpose overlock thread 120/2 (polyester) 70-90 Needles and looper
threads For all overlock and cover stitch work.
Polyester-continuous filaments Loopers only Neatening edges
Woolly nylon Loopers only Soft seams in knits,rolled hems.
Spun Polyester 80-90 Needles, and looper
threads Seams in all fabrics.
Embroidery/darning and decorative threads 70-90 Loopers only Neatening edges,rolled hems and cover stitch
applications.
Needles
Needles must be in perfect condition. Problems can occur
if needles:
A are bent.
B are damaged or blunt.
C have hooked points.
BC
Needle and thread
The needle size used depends on the thread. The needles should be in accordance with thread used. When sewing,
the thread is fed through the long groove in the needle. If the needle is too fine, the thread does not fit into the groove
and stitches will be skipped. Use needles No. 70 - 90.
* It is recommended to use JL×2 needle, especially when sewing thick materials, over-lapped section, etc, with over-
lock machine.
A
13

Stitch length
It can be adjusted while sewing.
The stitch length is infinitely variable from 1-4mm. Most overlock
work is done with a basic setting of 2.5mm.
Cutting width
Switch the machine o󰀨 (power switch ”O”)
Disconnect machine from electricity supply.
• Raise the upper knife.
• Turn cutting width adjustment dial in the desired direction.
• Lower upper knife.
Knife position:
1 = 4-6 mm seam width
2 = 5-7 mm seam width
3 = 6-8 mm seam width
4 = 7-9 mm seam width
5 = 8-10 mm seam width
The position of the lower knife determines the width of the seam.
Reduce the cutting width if the edges of fine fabric curl up when be-
ing sewn (A).
Increase the cutting width if the loops seem to be too loose (B).
A B
Adjustments and settings
14

Adjustments and settings
Di󰀨erential feed
There are two feed dogs one front (C) and one rear (D). The two feed dogs
move independently and the distance each feed dog travels during one
complete movement can be adjusted. The differential feed prevents fluting
or waving in knitted or stretch fabrics and movements between the layers
of fabric. It also ensures pucker-free seams in smooth fabric such as nylon
or closely woven fabric.
Perfectly flat seams in knits or stretch fabrics.
The distance travelled by the front feed dog should be greater than that of
the rear feed dog. The front feed dog, therefore, feeds an amount of fabric
which the rear feed dog can take up behind the needle without stretching
the fabric. (E)
Pucker - free seams in nylon or closely woven fabrics.
The distance travelled by the rear feed dog should be greater than that of
the front feed dog. The front feed dog, therefore, holds the fabric back so
that the rear feed dog can take it up behind the needle without any pucker-
ing. (F)
Adjusting the differential feed
The differential feed can be adjusted by simply turning the differential feed
adjustment dial in the direction desired. Always make a trial run. The differ-
ential feed is infinitely variable and can be adjusted while sewing.
DC
F
E
0.7
1.5
G
I
H
J
Adjusting the di󰀨erential feed
Simply turn the dial in the direction desired for fully variable adjustment
while sewing. Test sew.
Effect Fabric
2Wave-free seams
(G)
Thick wool knits, hand knitted articles, very stretchy
fabrics
1.5 Wave-free seams
(H)
Cotton, silk, synthetic jersey, sweatshirt fabrics and fine
knits
N Normal feed (I) Woven fabrics
0.7 No puckering (J) Fine nylon jersey, closely woven fabrics, lining fabric
satin, poplin
15

Adjustments and settings
Gathering
Using the differential feed, a single layer of fabric can be gathered before sewing it
to the garment. For example, sleeve heads and lower edges,yokes, lace edging or
frills.
Adjustment:
• Stitch: 4-thread overlock
• Differential feed: 2
• Stitch length: 3-4
• Cutting width: 2-3
Increase the needle thread tension (6-8) for a tighter gather.
A
B
Upper looper converter
Use the upper looper converter to sew stitches with one looper thread, such as
2-thread roll hem, 2-thread flatlock and overlock.
• Turn the handwheel to lower the needles.
Switch the machine o󰀨 (power switch ”O”)
• Open the looper cover.
• Attach the converter (stored in looper cover) to the upper looper arm (A). Insert
the wire hook into the upper looper eye (B) from back to front.
The upper looper has now been converted, i.e., it no longer carries thread but it
diverts the lower looper thread so that loops are formed.
16

Adjustments and settings
Settings, practical sewing
Roll hemming
• Turn the handwheel towards you until the needles are fully raised.
• For roll hemming, pull the selection lever to the front marking on the stitch
plate, furthest from the presser foot (C).
• For overlocking, push the selection lever to the rear marking on the stitch
plate, nearest to the presser foot (D).
The roll hemmer is fully integrated in the machine. The edge of the fabric
will be automatically rolled over, producing a very narrow, fine seam or hem.
Roll hemming is ideal for finishing edges on all fine fabrics, such as evening
clothes, lingerie, scarves, frills and also for curtains and napkins.
The presser foot pressure is factory adjusted to a medium setting. Should you
wish to adjust it, simply turn the knob in the direction desired:
Presser foot pressure
The presser foot pressure is factory adjusted to a medium setting.
Should you wish to adjust it, simply turn the knob in the direction desired:
Position of knob for normal pressure (M) = Medium.
More pressure: for thick or stiff fabrics such as denim, tweed, firm linen (H) =
High.
Less pressure: for light-weight or sheer fabrics and knits (L) = Low.
C
D
17

Sewing in tape
The standard presser foot is equipped with a tape guide. A tape can be
sewn into the shoulder or side seams of garments made from knits or
stretch fabrics to prevent stretching.
• Turn handwheel towards you until needles are fully raised. Match the
matching up marks on handwheel and side cover.
• Raise the presser foot.
• Lay the tape under the presser foot and slide it carefully into the tape
slot.
• Lower the presser foot.
• Sew a few stitches on the tape.
• Loosen the setscrew (A) and adjust the tape guide to suit the width of the
tape (B).
• Re-tighten setscrew.
• Raise the tip of the presser foot and place work underneath. Sew.
Settings, practical sewing
Thread breakage during sewing
Sew off immediately at an angle and remove the work. Re-thread. If the
lower looper thread has broken, cut off both needle threads at the needles
and remove surplus thread from below. First thread the looper and then the
needles. Start sewing again about 2 - 3 cm in front of the break.
2-3 cm
Unpicking seams
Using sharp scissors, cut the loops (C).Pull the needle thread (D) and the
stitches will come undone.
C
D
C
D
A
B
18

• Support rod with thread guide must be fully raised.
• Open the looper cover.
• Turn the handwheel towards you until the needles are fully raised.
Match the matching up marks on handwheel and side cover.
• 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 (lay-in threading)
The thread guides on the top of the machine are color coded and simple to
thread.
Hold the thread with both hands and slip into the appropriate guide from back
to front in the direction of the arrow and pull gently.
Needle-/looper threader
Insert thread into threader. Push the rigid end of the threader from front to the
back through the looper or needle eye and pull completely through the eye.
Re-threading or changing threads
If spools are empty or you want to change the thread, it is not necessary to rethread the machine. Simply cut off the
threads above the cones or spools, replace them and knot new thread on to the existing thread. Cut the threads off at
the needles. Raise the presser foot, pull the threads through and rethread the needles. Pull the looper threads through
using the existing thread chain. Some thick decorative threads cannot be pulled through the looper eyes. Lower the
presser foot. Select the stitch of your choice and test sew.
Threading preparations / tips
Switch the machine o󰀨 (power switch ”O”)
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