JUKI MO-1000 Manuale utente

MO-1000 Series

SERVICE MANUAL

No.00

40138732

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

CONTENTS

1SPECIFICATIONS............................................................................ 1

2NAME OF EACH COMPONENT ..................................................... 2

1. Appearance ............................................................................................................... 2

2. Inside of the cover.................................................................................................... 3

3STANDARD ADJUSTMENT / DISASSEMBLY AND ASSEMBLY... 4

1. Removing order of covers....................................................................................... 4

2. Installation of the throat plate ................................................................................. 8

3. Height of the needle bar......................................................................................... 10

4. Position of the feed dog......................................................................................... 12

5. Adjusting the stroke of the sub feed dog............................................................. 14

6. Height of the feed dog............................................................................................ 16

7. Feed dog timing...................................................................................................... 18

8. Position of the balance weights and the cams.................................................... 20

9. Projecting amount of the upper looper ................................................................ 22

10. Radius of the lower looper .................................................................................... 24

11. Adjustment of the loop lift ..................................................................................... 26

12. Timing between upper and lower looper.............................................................. 28

13. Installation of the needle guards .......................................................................... 30

14. Adjusting the looper thread take-up..................................................................... 32

15. Height and lateral position of the presser foot.................................................... 34

16. Adjusting the oating of the disk of the thread tension controller ................... 36

17. Adjusting the tension of the thread tension controller....................................... 38

18. Position of the needle thread take-up thread guide............................................ 40

19. Tension of the belt.................................................................................................. 42

20. Adjusting the needle bar connection guide of the needle threader .................. 44

21. Adjusting the needle threader hook ..................................................................... 46

22. Adjusting the looper threader timing ................................................................... 48

23. Adjusting the pump unit ........................................................................................ 50

24. Position of the lower knife..................................................................................... 52

25. Engagement of the upper knife with the lower knife .......................................... 54

To avoid the risk of re, electric shock, injury to persons or damage to components,

especially keep the following:

• When disassembling, assembling or adjusting the sewing machine, remove the power plug.

• When assembling, be careful about the electrical cord being caught with other components,

damage to the covered parts of the cord or miswiring.

• When replacing the part(s), use the genuine part(s).

WARNING :

26. Adjusting the timing of the upper knife................................................................ 56

27. Adjusting the thread sliding segment .................................................................. 58

28. Adjusting the safety switch ................................................................................... 60

29. Position of the cloth plate...................................................................................... 62

4CIRCUIT DIAGRAM....................................................................... 64

5MAINTENANCE ............................................................................. 66

1. Lubrication.............................................................................................................. 66

2. Grease application ................................................................................................. 66

3. Looper threader...................................................................................................... 66

6TROUBLES AND CORRECTIVE MEASURES ............................. 67

–1 –

No. Items Description

1 Model name 2-Needle, 2/3/4-Thread Overlock Sewing Machine (with differential feed

adjusting)

2 Stitch choice 2 needles, 4 thread overlock

2 needles, 3 thread overlock

1 needle, 3 thread overlock

1 needle, 2 thread overlock

3 Sewing speed Up to 1,500 sti/min Rating 1,350±150 sti/min

4 Needle gauge Overlocking: 2.2 mm

5 Overedge width 2 needles, 4 thread: 5.0 to 9.0 mm

1 needle, 3 thread (right hand needle): 3.0 to 7.0 mm

1 needle, 3 thread (left hand needle): 5.0 to 9.0 mm

Roll hemming: 2.0 mm

Knife width 2.5 to 6.5 mm

6 Thread sliding segment (*1) It is in synchronism with the lower knife from scale marks "2.5" to "5" of

the knife adjusting knob.

The amount of travel of the thread sliding segment can be nely adjust-

ed with the MTC knob.

7 Stitch length 1.0 to 4.0 mm (Standard 2.5 mm)

8 Differential feed 1：0.7 to 2

9 Needle bar stroke 29.4 mm

10 Presser foot height 4.8 mm to 5.0 mm

11 Feed dog height 1.3 mm (This side end of the sub feed dog P = 2.5 mm; differential feed

ratio: 1:1)

12 Needle system (Japan) ORGAN needle HA×1 # 11 (Standard) to # 14

Needle system (Overseas) SCHMETZ (130/705H 15X1H) # 80

13 Number of needles Max. 2

14 Number of threads to be used Max. 4

15 Needle threader Operated by the manual lever

16 Looper threader Automatic threading by the air pump

17 Air pump Piston pump driven by the motor

Motor: DC 12V

18 Liquid crystal display (*2) Display section: 63.0 mm (W) × 17.5 mm (H)

19 Power switch Rocker switch

20 Light LED 5V x 2

21 Motor 100V : 100 to 120W

110/120V : 100 to 120W

220 to 240V : 100 to 130W

22 Foot control No-heat method (semi-conductor control type)

23 Driving system Timing belt drive

24 Machine size 330 mm (W) × 280 mm (D) × 310 mm (H)

25 Machine weight 9 kg

1SPECIFICATIONS

M/ML

* 1: Only for ML type

* 2: Only for M/ML types

–2 –

Open thread guide

Thread guide support

Retractable support rod

■View with looper cover open

Lower looper thread tension dial

Upper looper thread tension dial

Right needle thread tension dial

Left needle thread tension dial

Thread take-up cover

Main Power/Light switch

Thread stand

Stitch length adjustment dial

Differential feed adjustment dial

Front cover

Cloth plate

Handwheel

Machine socket

Looper cover with built in

knife guard

Looper cover opening indent

Thread cutter

Presser foot lifter

Stitch plate

Needle clamp

Upper knife

Presser foot

Automatic needle threader

LCD screen *1

Top cover

Spool holder pin

Anti - vibration cone

Foam pad

Upper knife changeover knob

Overlocking width

adjusting knob *2

Upper looper

Lower looper

Threading hole

Lower knife

Upper knife xing screw

Cutting width adjusting dial

Selection lever for overlocking

or roll hemming

Air-control pushbutton

Threading changeover

lever

2NAME OF EACH COMPONENT

Presser foot pressure

regulating knob

Caution: Be sure to turn off the power switch

before opening the looper cover.

1. Appearance

M/ML

* 1: Only for ML type

* 2: Only for M/ML types

–3 –

Safety switch

Looper threading

mechanism

Knife

Needle threading mechanism

Microprocessor PCB *1 Power PCB

Air pump motor

Motor

2. Inside of the cover

Safety switch

Front face

Rear face

–4 –

1. Removing order of covers

1-1. The top cover

○ Pushing the arrowed section in the gure by both

hands (i.e., removing the projections of the front

cover from the holes in the top cover), draw this

side upward.

○If it is not easy to detach the rear projection from

the corresponding hole, detach it with a screw-

driver or the like.

In the case the rear projection cannot be easily

removed since its left side comes in contact with

the presser spring regulating knob, detach the

presser spring regulator knob rst. Then, the rear

projection will be detached smoothly.

1-2. The looper cover

○Loosen and remove the set-

screws 1.

STANDARD ADJUSTMENT / DISASSEMBLY AND ASSEMBLY

Draw upward

Push

Screwdriver or

the like

Projection

Hole

Presser foot pressure

regulating knob

–5 –

1-3. The base plate

If the sewing machine is tilted away from you, the sewing machine

will not be stabilized since the rear cover has a rounded surface.

It is recommended to place the sewing machine with the cloth plate

down on the table.

○Loosen and remove the setscrews 1.

○ The projections of the base plate are tted in the holes in the

front and rear covers. Push up the base plate to remove the

projections from the holes.

1-4. The rear cover

○Raise the presser bar lifting lever.

○Loosen and remove the setscrews 1.

○Remove the rear cover.

Caution: If you remove the rear cover forcibly

by moving it to the right and left, the

claws between the rear cover and the

front cover can break.

Raise the presser

bar lifting lever.

Push the

base plate

–6 –

1-5. The front cover

○ Turn the pulley to retract the looper to the position indicated in the gure A.

Caution: Be sure to retract the looper without exceptions. Be aware that the 2/3 thread changeover

lever can break if the looper is not retracted.

○Remove two connectors 1(CN3 and CN4) of LED lamp from the power PCB. Cut the cable clip band.

○Loosen and remove the setscrews 2.

○Remove looper threading lever screw 3to remove the lever.

○Remove the setscrews 4and 5.

○While keeping needle threader shaft 6held pressed, remove

it from the left side of the cover.

○Remove the looper threading section.

【ML type】

Caution: At this time, be aware that LCD panel cable 7is

connected to the PCB on the right side.

Rear side of the

sewing machine

Cable clip band

Push

Avoid interference

with Front Cover

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