Juki M0-6000S, M0-6900G, M0-6900R, M0-6900J User Manual

a.JUKI®

Super-High-Speed Ovel1ock Machine High-Speed Ovel1ock Machine/ Safety Stitch Machine

M0-6000S

M0-6900G

High-Speed Variable Top

M0-6900R series

M0-6900J

ENGINEER'S MANUAL

·~:-·

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series

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series

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29355807

No.E350-01

PREFACE

This Engineer's Manual is written for the technical personnel who are responsible for the service and maintenance of the machine. The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detail. And this manual describes "Standard Adjustment", "Adjustment

of

Procedures", "Results

Manual.

It is advisable to use the relevant Instruction Manual and Parts List described below together with this Engineer's

Manual when carrying out the maintenance of these machines.

In addition, for the motor for the sewing machine with thread trimmer, refer to the separate Instruction Manual Engineer's Manual for the motor. And for the control panel, refer to the Instruction Manual for the control panel.

This manual gives the "Standard Adjustment" on the former page under which the most basic adjustment value

described, and from mechanical failures are described together with the

on

Improper Adjustment", and other important information which are not covered by the Instruction

or

is

the latter page "Results of Improper Adjustment" under which stitching errors and troubles arising

CIAdjustment

Procedures".

ii

ll

11

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MO·6900S MO-6700S

N

~

Instruction Manual 29351707 Parts List 29351806 29352408

Part No.

Part No. Part No. Part No. Part No.

29351707 29351707 29356409 29363009

MO·6900G

29352309 29356201

MO·6900R MO·6900J

29362803

CONTENTS

1. SPECIFICATIONS ....... _ ...•....•..•••.•.••••...•••..••••.••.••••••..•.••...••..•........•..•••.•..•••.••.•... 1

(1) MO-6700S SERIES ........................................................................................................... 1

(2) MO-6900S SERIES ........................................................................................................... 2

(3) MO-6900G SERIES

( 4) MO-6900R SERIES •.••.•••••••••••.••••.•••.••••••••.•••••.......•.•..••..•••...•.......•.•.•••.•.••..•...•..••.....•.•.•...• 4

(5) MO-6900J SERIES ............................................................................................................. 5

2. MODEL NUMBERING SYSTEM ..••.••.•••..••••...••...•.•••••••.•••.•..•.••.•...•..•...••.•...•..... 6

3. STANDARD ADJUSTMENT ....••.•.•.•..•••..•.••••.••••••....•......•..•.•••.••......•.•.••.••.....•.. 8

(1)

Adjusting

(2)

Positioning

(3)

Installing

(4)

Adjusting (Applicable

(5)

Adjusting

1)

Returning amount of the lower looper .................................................................................................... 12

2)

Clearance between the lower looper and the needle .............................................................................

(6)

Position

(7)

Positioning

(8)

Positioning

1) Height of the upper looper .................................................................................................

2) Longitudinal position

(9)

Adjusting

· (Applicable

1) Returning amount of the double chain looper .........................................................................................

2) Longitudinal motion {Avoid motion) ........................................................................................................

3) Clearance between the double chain looper and the needle ................................................................. 20

(10)

Adjusting

1) For 1-needle

2) For safely stitch machine ........................................................................................................................

(11)

Adjusting

(12)

Adjusting

(13)

Adjusting

(14)

Longitudinal

(15)

Adjusting

1) Adjusting the tilt of the presser foot ........................................................................................................

2) Adjusting the micro-lifting mechanism of the presser foot ......................................................................

(16)

Positioning

(17)

Positioning

1)

lower

2) Upper knife ............................................................................................................................................. 30

3) Overdging width ......................................................................................................................................

(18)

Resharpening

(19)

Position

1) Adjustment of the thread cam ............................................. : ................................................................... 32

2) Adjusting looper thread cam thread guides A and B and the looper thread cam nail ............................. 32

the

position

the

only

the

of

the

the the

the

only

the

or

the the the

the

knife ............................................................................................................................................. 30

of

the

•••••••..•••••••..•••••••...••••••..••••..••••.•••••.•.•••.•....•.••...•••••...•.•••••.•.•.•.•••.•.•.•••.•.

needle

length

lower

upper

double

height

2-needle overlock machine ........................................................................................... 22

tillt

position

the the

height

throat

of

the

of

to

MO-6.616S / MO-6916R, G, J

looper

looper upper upper

of

the upper looper ................................................................................................ 18

chain

to

M0-6~

height

of

the

differential presser

upper upper

of

the

thread

............................................................................................ 8

plate

............................................................................................ 8

needle Clamp .......................................................................

the

lower

._

..........................................................................................

looper looper

guide

holder

looper

...............................................................................

holder

series)

...........................................

............................................................................

........................................................................................

~

.................... 18

looper

16S/MO-6916R, G, J series) ............................................... 20

and

clearance

of

the

feed

dog

feed

of

the

feed

foot

.......................................................................................... 28

knife

arm

and

lower

knife

.......................................................................................... 32

cam

(Applicable

of

the

needle

dog

.........................................................................

guard

.............. ~ .......................... 22

................................................................................

ratio

........................................................................... 26

dog

.......................................................................

shaft

.......................................................................

knives,

and

only

available

to

MO-6~16~

overedge

series)

widths

........................

.............. 30

3

10 10

12

14

16

18

20

22

24 24

26

28

30

32

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(20)

(21)

(22)

(23)

(24)

(25}

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Adjusting Adjusting Adjusting

Adjusting Adjusting Position

1)

Orientation

2)

Setting the lubricating pin ....................................................................................................................... 40

(26)

Longitudinal (27) Vertical (28)

Adjusting

(29)

Locus Adjusting

(30)

(31)

Adjusting

(32)

Position

(33)

Adjusting Adjusting

(34)

(35)

Lifting

(36)

Height Lifting

(37} (38) Position

Adjusting

(39)

1)

Replacing· the parts with those exclusively designed

2)

Adjustment value .................................................................................................................................... 64 -

3} Important points

(40) Position

the throat plate support .............................................................................

the

feed mechanism

the

looper

the

cloth

the needle mechanism ............................................................................... 38

of

the

upper

of

the lubricating pin ............................................................................................................. 40

momentum

the

height

cut

of

the

longitudinal

the lateral

of

the

motion the feed the

top

amount

of

the presser (pedal operation) ..................................................................... 58

amount

of

the

soft

chain making mechanism .................................................................. 64

in

of

the

cover

chip

cover

looper

of

the

of

the

top

feed

position

of

bar

guides

feed

dog

of

the

top

of

the

top

thread

adjustment ............................................................................................................... 65

thread

guides

cover

.........................................................................................

................................................................................... 36

lubrication

of

the

top

feed

top

feed

dog

.................................................................................... 48

position

of

the

top

A and B ................................................................. ~ .•..

pressure .........................................................................

feed

dog

feed dog (when

and

presser .......................................................... 34

.............................................................

top

feed

dog

(Top feed amount) ...........................

dog

.................................................................... 44

dog

................................................................... 46

of

the

top

feed

dog

.......................................... 48

the

top

feed

dog

.................................................... 50

feed

dog

...............................................................

(when operating

the

presser

the

looper

thread

for

making soft chains ......................................... 64

thread take-ups

the

pedal) ••....••..••..••.......•..••.•

lifting

take-ups ................................ 62

lever

is

operated)

of

MO-6900G (J) ... 66

.••

34

36

40

42

52 54

56 56

60

4. ADDITIONAL INFORMATION AND PRECAUTIONS ..................................... 68

(1) Thread

1)

2)

(2) Upper looper· .................................................................................................................. 69

(3) Center-to-center distance

(4) Caution

1) Application

2) Precautions to

(5) Kinds

1)

2)

(6)

Inspection

5. ADJUSTMENT

(1) MO-60006. SERIES ........................................................................................................

tension

Strength of tension spring ....................................................................................................................... 68

Springs used

in

of

motor

Motor pulleys

Pat

No.

of

............................................................................................................... 68

for

each model. ................................................................................................................. 68

of

the

upper

assembly

of

sealant .............................................................................................................................

be

and

frame support plate bolt ......................................................................................................... 73

and replacement

OF

...................................................................................................... 69

taken with respect to the lubricating components ............................................... ~ ......

pulleys,

belts ........................................................................................................................... 72

belts

and frame

of

the

THE NEEDLE HEIGHT AND LOOPER TIMMI NG ........... 7 4

looper

support

cartridge

holder

filter

............................................... 69

plate

bolts

.................................... 72

..................................................... 73

69

71

74

6. TROUBLES AND CORRECTIVE MEASURES ............................................... 75

7. DIMENSIONS

(1) Semi-sunken

(2) Fully-suken

OF

TABLE

type

.................. u

••...••.••..••••....•.•..•.•.••••.•..•••.•..••••..••.••••••..•••.•••.••..••.•..

..........................................................................................................

........................................................................................

87

87 88

1

..

SPECIFICATIONS

(1) MO-6700S SERIES

No.

1

2

3

4

5 6

7

8

9

10

11

12

13

14

15

16

17

18

19 20

21

22

23

Model

Description

Stitch

Sewing Stitch Needle Overedging Differential Needle Needle Needle Presser Presser Stitch Upper Differential Weight

Lubrication

Lubricating

Needle Needle

Micro Motor

Item

type

F.

S.

speed

length

gauge

width

feed

bar

stroke

tilt

angfe

lifting

amount

foot

pressure

acfJUstlng

knife

feed

oil

cooler thread

presser

lifting

T.

ratio

method

adjustment

heat

remover

device

M0-67048 M0-67148

1-neecile

JISE13 (USA

Overlock

machine

standard : 504)

JISE24 (USA

. 0.8to4mm

-

1.6,

3.2,

4,

4.8

mm

Gathering

ORGAN

7.0mm

•

JUKI

1 = 2

DC X 27

By

lever

Gear-type

MACHINE

2P

400W

(Max.1 : 4),

(Standard)

with

550W

Specifications

2-needle

machine

standard:

7,000,pm

2,

2.4,

32,4,4.Bmm

Stretching

24.5mm

20·

6.5nm

49N

By

pushbutton

FlatknHe

micro

adjustment

28kg

automatic

OIL

18

Optional

Provided

(In

case

(in

case

of

Overlock

514)

3.2

mm

(DC

X 1

(5Kg)

lubrication

(Equivalent

as

standard

of

7,000

less

than

JISE13+D12 (USA

1 :

0.7

(Max.1 : 0.6)

can

be

used

medlanism

to

ISO

rpm)

7,000

rpm)

. M0-6716$

2-needle

machine

standard = 516)

1.5to4mm

2.

3.2,

4,

4.8,

as

well.)

7.0mm

VG

18)

Safety

4,

4.8

6.4

stitch

mm

111

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* JUKI MACHINE

No. : MML018900CA (900 m g )

Part

OIL

18 (Equivalent to ISO

VG

18)

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-

(2)

MO-6900S

SERIES

No.

10

..

1

2

3

4

5

6

7

8

9

11

12

13 14 15

16

17

18

19

20 21

22

23

Model Description

Stitch

type

Sewing

speed

Stitch

length

Needle

gauge Overedging Differential Needle

bar Needle

tilt Needle Presser

lifting

Presser

foot

Stitch

adjusting

Upper

knife

Differential

Weight

Lubrication Lubricatina Needle

cooler

Needle

thread

Micro

presser

Motor

Item

F.

S.

width

feed

stroke

angle

amount

pressure

feed

oil

lifting

T.

ratio

method

adjustment

heat

remover device

1-needle

JIS

E13

(USA

standard : 504)

1.6,

MD-69045

Over1ock

machine

8,500rpm

-

3.2,

4,

4.8

Gathering

ORGAN

7.0mm

" Provided Provided

0.8to4mm

mm

DC

By

JUKI

as as

2P

JIS

(USA

1 : 2

(Max.1 : 4),

X 27

(Standard)

lever

with

Gear-type

MACHINE

standard

Provided

550W

(In

400W

(In

Specifications

M0-6914$

2-neeclle

E24

(Exduding {Excluding

case

machine

standard:

2,

2.4,

3.2,

4, 4.8

Stretching

24.5mm 20·

6.5mm

49N

By

pushbutton

Flat

micro

adjustment

28kg

automatic

OIL

18

of

case

of

Over1ock

3.2

(DC

(5Kg)

knife

(Equivalent

as

not

less

514)

mm

X 1

can

lubrication

some

of

some

of

standard

less

than

2-needfe

JISE13+ (USA

8,000rpm

1 : 0.7

{Max.1 : 0.6)

be

used

mechanism

to

ISO

VG

subclass

subdass

7,000

rpm)

7,000

rpm)

MQ-69168

Safety

machine

D12

standard : 516)

1.5to4mm

2,

3.2.

4,

4.8

3.2,

4,

4.8,

as

weil.)

7.0mm

18) machines) machines)

6.4

stitch

mm

* JUKI MACHINE OIL

18

(Equivalent to ISO VG 18)

Part No. : MML018900CA (900 m

! )

-2-

(3) MO-6900G SERIES

·

No.

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16

17

18

19

20

21 22 23

Model

Description

Stitch

Sewing Stitch

Needle

Overeclging Differential

Needle

Needle Presser

Presser

Stitch

Upperknife Differential Weight

Lubrication

Llbricating Needle Needle Micro

Motor

Item

type

F.

S.

speed

length

gauge

width

feed

bar

stroke

tilt

angle

frfting

amount

foot

pressure

acfjUSting

feed

oil cooler thread

presser

T.

ratio

methcxJ

adjustment

heal

remover

lifting

device

M0-6904G

1-needle

JIS

E13

(USA

standard : 504)

2.5to5mm

4.8,

Gathering

Stretchirg

Specif

cations

M0-6914G

Overlock

machine

-

10mm 6.4mm 4.8,6.4mm

1:

1.75

(Max.1

:

3.8)

1 :

0.6

By

lever

*

JUKI

MACHINE Provided Provided

as

standard

as

standard

2-needle

JISE24

(USA

Gathering

Stretching

ORGAN

By

with

micro

Gear-type

OIL (Excluding (Excluding

Provided

Overlock

machine

standard : 514)

6,000rpm

2.5to4mm

2.6mm

1 : 2

(Max.1

:

1 :

0.7

(Max.1

28.8mm

20·

DO

XS

Max.Bmm

49N(5Kg)

pushbutton

Flat

knife

adjustment

28kg

automatic

2P400W

18

(Equivalent

some some

as

standard

lubrication

3.8)

:

0.6)

mechanism

to

ISO

of

subclass

of

subclass

M0-6916G

2-needle

machine JIS E13+ 012 (USA

standard:

2.5to5mm

4.8mm

Gathering

1 :

Stretching

1 :

VG

18) machines) machines}

Safety

1.75

{Max.1 : 3.8)

0.6

stitch

516)

·-

• JUKI MACHINE OIL 18 (Equivalent to ISO VG 18)

Part No. : MML018900CA (900 m 2 )

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(4)

MO-6900R

No.

Model

1

2

Feed Description

3

Stitch

4

Sewing

5

Stitch

6

Needle

7

Overedaina

8

Differential

9

Needle

10

Needle

11

Needle

12

Presser

13

Presser

14

Stitch

15

Upper

16

Vertica!

17

Lonaitudnal

18

Top

19

Differential

20

Weight

21

Lubrication

22

Lubricating

23

Needle

24

Needle

25

Micro

26

Motor

27

type

F.

speed

length

gauge

bar

tilt

angle

lifting foot

adjusting

knife

amount

feed

adjusting

cooler thread

presser

SERIES

Item

S.

T.

width

feed

ratio

stroke

amount

pressure

method

of

top

amount

of

type

feed

adjustment

oil

heat

remover

lifting

device

feed

top

feed

JIS (USA

dog

dog 1

Specifications

M0-6904R M0-6914R

Vertical

amount

1-needle

E13

Overlock

r:nachine

standard :

7,000

6,000

504) rpm

rpm

JIS

(USA

(longitudinal

0.8to4mm

2-needle

machine

E24

standard : 514)

amount

-

3.21 4,

4.8,

5.6

mm

Gathering

ORGAN

7.0mm 6.5mm

to

7.5

mm

Provided Provided

1 : 2

DC X 27

(deoending

By

lever

*

JUKJ

MACHINE

as

standard

as

standard

2P

55DW

2P

(Max.

Gear-~,pe

400W

1 :

(Standard)

49N

By

3.5to8.5mm

on

the

~ifications

with

micro

OIL

(Exduding

(Excluding

Provided

(In

case

(In

case

3.2.4nm

4),

24.5mm

pushbutton

Rat

By

automatic

18

of

top

feed

Over1ock

of

top

of

top

2mm

Stretching

20·

(DC

X 1

(5Kg)

knife

lever

adjustment

29kg

lubrication

(Equivalent

some

as

standard

not

less

of

less than

dog

feed

less

feed

6

1 :

0.7

can

be

of

the

mechanism

to

ISO

of

subclass

of

subclass

than

7,0CYJ

7,000

M0-6916R

2-needle

machine

JISE13+D12

{USA

standard : 516)

than

6 rrm)

to

8.5

mm)

1.5to4mm 32,4.Bmm

3.2,

4,

4.8,

(Max.1 : 0.6)

used

as

well.)

5.5mm

respective

VG

18) machines) machines)

machines)

rpm)

Safety

6.4

stitch

mm

• JUKI MACHINE OIL

18

(Equivalent to ISO

Part No. : MML018900CA (900 m

f )

VG

18)

-4-

(5) MO-6900J SERIES

No.

Model

1

Feed type

2

Description

3

Stitch

4

Sewing

5

Stitch

6

Needle

7

Overedging

8

Differential

9

Needle

10

Needle

11

Needle

12

Presser

13

Presser

14

Stitch

15

Upper

16

Vertical

17

Longitudinal

18

Top

19

20

21

22

23

24

25

26

27

feed Differential Weight Lubrication Lubricating

Needle Needle Micro Motor

* JUKI MACHINE OIL

Part No. : MML018900CA (900 m £ )

Item

type

F.

S.

speed

length

gauge

width

feed

bar

stroke

tilt

angle

lifting

amount

foot

pressure

acfJUsting

knife

amount

adjusting

feed

oil cooler thread

presser

lifting

T.

ratio

method

of

top

feed

of

top

type

adjustment

heat

remover

device

18

doa

feed

dog

(Equivalent

1-needle

JIS

E13

(USA

standard:

2.5to5mm

Gathering

Stretching

2.7

to

ISO

.

Specifications

M0-6904J

Vertical

Orerlock

machine

504)

-

4.8mm 6.4mm

1 :

1.75

(Max.1 : 3.8)

1 :

0.6

to

7.0

mm

(depending

By

lever

Gear-type

*

JUKI

MACHINE

Provided

VG

18)

as

standard

as

standard

M0-6914J

amount

2-needle

machine

JISE24

(USA

standard:

6,000rpm

2.5to4mm 2.5to5mm

2.6mm

Gathering

Stretching

with

1 : 2

1:

28.8mm

ORGAN

Max.8mm

49N

By

pushbutton

Square

3.5to8.5mm

on

the

specifications

By

micro

29kg

automatic

OIL

18 (Exduding (Excluding

Provided

2P400W

0.7

20·

lever

adjustment

as

of

top

feed

Overlock

514)

(Max.1 : 3.8)

(Max.1 : 0.6)

DOX5

(5Kg)

knife

lubrication

(Equivalent

some

of

some

of

standard

dog

2-needle

JIS (USA

Gathering

Stretching

of

the

respective

mechanism

to

ISO

VG subclass subclass

M0-6916J

Safety

machine

E13+ 012

standard : 516}

4.8mm

4.8,6.4mm 1:

1.75

1 :

0.6

machines)

18} machines) machines)

stitch

(Max.1:

3.8)

I

-5-

I!

l,

I,

11

I

i

ii

11

.I

l

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!j

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2.

MO-6000 SERIES MODEL NUMBERING SYSTEM

1 2 3 4 5 6 7 8 9 10

~I

1

11

II

I

ll

I

~

I

11

·I

11

ri!

i

I

11:

M06666DDD6666/D666-DO6

4

7 · 6700 series

9 6900 series

7

s

G

*

A

*

,I

* 6900only

MODEL

Machine

J

Basic

Standard

Extra

Variable

Variable extra

code

specification

heavy-weight

NUMBERING

code

materials

top

feed

type

top

feed

type

for

materials

SYSTEM

11

12 13 14 15 16 17 18 19 20

5. 6 Seam

03

04

05

12 14

16

43

45

code

Splicing

1-needle

For

blind 2-neeclle 2-needle

2-needle

3-needle 2-needle

3-threa~ hemmong 4-thread

4-thread

S.thread

6-thread double

chainstitch

overtock

(505)

mock

safety overtock safety

stitch

safety

stitch

(504)

(514)

(516)

stitch

(512)

21

22

8

0

B C 2.4mm,

D

E

F

1 4.8 mm+ 2.0

Needle

gauge

1-needle

2.0mm

26

mm

heavy-weight

materials)

32mm

4.0mm

4.8mm

(for

code

extra-

mm

11

I

9

Overedging

1.6mm

A

D

3.2mm

4.0mm

E

4.8mm

F

6.4mm

H

10.0mm

M

18.0mm

N

12

Application

Classification

and

process

0

Standard

1

For

blind

2

Forgathering

4

For attaching

5

For

binding

6

For

binding

Splicing•

D

E Car mattress

F

Soft

chain

width

code

based

stitching

tape

code

on

tape

type

1 O

4

5

6

7

of

operation

Feed

2-row

1-row 3-row 4-row

dog code

11

Material

code

Classification

1

2 Light-weight

-----

3

4

-

5

------

6

7

based

Extra

light-weight

weight

materials

weight

materials Medium-weight weight

materials

Heavy-weight to extra heavy-weight

on

materials

to

medium-

to

to be used

light- For light-weight materials

shirts

or

the

Knit

wear

only

General

fabrics

heavy-

Knit wear the

fike Medium·weight to heavy-weight materials

For

such

heavy-weight

Heavy-weight

materials

mattress,

etc.

Uke

only

materials

such

as

denim materials

such

as

sweater or

or

for

jeans,

the

as

like

car

•

In

case

of

the

splicing,

13th

figure

is

(1).

-6-

13

Special

classification

specification

0

Standard

6

Feed

7

Upper

F

For

swim

H

Upper

M

For

zipper

1

For

splicing

15

to

18

Device

G0'2/O141 G39/Q141

L121

S159

S161

S162 N077

machine

dog

code of

machine,

other

than

gauge

provided

looper

high

suits

looper

extra

and

attachment

Presser

fo(?Vtape Presser foot (for sharp curve)/tape guide for attaching Blind

hemming

Swing

type stitch} Swing

type ruffler stitch) Swing

type

Four-fold

structure

set

w~h a lip

throw

type

high

throw

code

guide

tape

ruler

ruffler

(pedal-intertocking

ruffler

(Manual

binder

type

for

(Manual

and

attaching

lever

tape

type

lever type for safety

type

for

safety

over1ock)

I

J

l

j

I

11

lj

I,

\

I

i

I

II

·1

20

A

21

22

•

The

Machine

Standard (Common

Accessory

A

Fa

B

ForJE

G

For

Machine

0

Fully-sunken

Semi-sunken

general

head code

machine

code

general

China

head

export

head

to

all

specifications)

export

*

code

type

s~ification is for

Hong

The

numberings

and

after

Kong,

Apnl

U.SA,

after-..!'

1,

2002.

Japan and

(hyphen)

They

are

Singapore.

of

19th

not

described

figure

on

will

the

be

used

catalogue

on

or

the

fike.

~

j:

11

I

11

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ij

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.. 7 -

I

3.

STANDARD

ADJUSTMENT

Standard Adjustment

i'

!

1·

I

(1) Adjusting

When the needle(s) is in the highest position, the needle height from the throat plate surface should be as shown below.

11

z,z

.,[!~zzma

C2'Z2222Z]n

I

j

I:

I'

I

the

6~046

··-

~

1

,inJ,a

66146

66166

n

needle height

1-needle/

2-needle

: left

10.5

11.3

11

:0

11.3

10.5 9.1

11.3

10.5

11.3 13

10.5

11.3

9.8

14.4

15.4

14.1

for

MO-

30-

SD

~

:I

n ::i.,

CD

g:

R

~

Cl)

:II,"

Cl)

MO-

fl)

::,

MO-

Cl)

3 Cl)

I»

e:

MO-

n

a,

2:o

MO-

:,

<

CD

Cl>

::i.

0

MO· 6614S (R)

0

':,t:

MO-

en

MO-

3

e.

II>

a,

MO- 6Li 16S(R)-A.6.L'l

g.~

-·

en

MO- 6943R -6.D.6

i~

MO- 66.43S

::r

MO-

MO· 6903G

:i5:

0

MO· 6904GCJl-OF6

0,

CD

MO-

0

p

MO-

<-

MO-

The adjustment

Model

6l!.04S(R)

6604S

6/\05S

6.6.125 SD.12S

Sb

6b

Sil

6/\45S

6905G 6914G(Jl-CH6 6916G(J)-F

-l!.66

-D.D.D.

-606

-D.D.D.

-CE4

14S (R)

-8~6

-B66

16S(R)-D.D.b

16S(R)-b.66

-61::J.{:j,

-D.b.l:l

-ON6

·OM6

.0.6

·l!..60

-Lib.6

SOM

·66H

-66.H 11.3 507

SOF

-40H

-3c7

-20H

40H

-.t.60

-l!..6H

-60H

-b.l::,7

·6.D.H

-360

-3D1 15.4

-700

-760

-700

of

needle height overlock machine should be made in reference to the left needle.

(Unit: mm)

2-needle : right

-

9.4

9.9

-

9.9

-

12.6

-

the

2-needle

. -

I

I·

1;

ii

I

.I

I!

i

I

(2) Positioning the throat plate

The

needle entry point should be such that the distances listed below are provided between the

needle slot edge of

Over1ock

Double·chainstitch side B

Note that

for

M0-6~

side

A

"A:=1.8"

16S (R)

"A=1.6" and "8=1.3" for

the

throat plate and the center of needle.

1.3

1.0

and

"8=1.5"'

-n6.6-60H,

M0-69~6G,

(Unit:

J

mm)

I

-8-

A

Adjustment Procedures

Results of Improper Adiustment

1) Take off the upper cover, loosen setscrew 8. of needle driving

forked crank

down to adjust the needle height.

O and move needle driving forked crank O up

or

o Any other needle height than

specified here the action of the lower looper. the timing for.catching the upper looper thread, etc.

will badly affect

(Caution) Do not fully loosen the setscrew 8 of the needle

driving forked crank If the needle driving forked

laterally when setscrew and

until

it

settles

forked crank

1} Loosen setscrews 8 of throat plate base O and move throat

plate base

at

8 back and forth to adjust dimension A or

0.

crank

has

got

out

of

its

setscrew was loosened, fully loosen the

turn

pulley

to

allow the forked crank

by

itself. Then tighten the setscrew

that

position.

position

to

tum

to

fix

the

B.

of

o Improper lateral position

needle driving forked crank cause seizure, play, troubles.

o Improperly positioned throat

plate breakage, needles will the throat plate,

will

cause contact

the

will

or

other

needle

of

the

or

other troubles.

-9-

,11

!I

:-1

;ii

Standard Adjustment

II

I

1l

Ii

I

'I

!1

'I

11

~

'!i

I

(3) Installing position of the needle clamp

Needle clamp connecting stud O should fit with the bottom end of needle bar 8

0.5mm.

Oto 0.5 mm

Butt the needle clamp with the

end

of

the

bottom

needle bar.

0

or

spaced within o to

( 4)

Adjusting (Applicable

The center-to-center distance should be 26 mm. At this time, the clearance between the end surface of the arm and the neck of the ball should be

3.5mm.

the

only

length

to

M0-6~

26mm

of

the

lower

looper

16S

/ M0-6916R,

holder

G, J series)

-10

-

Adjustment Procedures

Results of Improper Adjustment

1) Loosen setscrew O and adjust, by slightly turning needle clamp

8.

the clearance provided between the right-hand side needle

and the lower looper (for 2-needle overlock machine) and the

clearance provided between the needle hole

and the needle (for safety stitch machine).

in

the throat plate

o

If

the

clearance betw~en the needle and looper is excessive, the needle thread will time of tucking.

o

If

the

between

looper is insufficient, the needle

will break or the looper blade

point will be damaged causing thread breakage.

be

clearance

the needle and

provided

likely to skip at the

provided

the

1) Loosen setscrew O of the lower looper holder from the rear of

the frame. Since it is difficult to accurately measure the center-to-center distance. perform adjustment to provide a 3.5 mm distance between the end surface of the arm and the neck of the ball as illustrated.

o Increasing the center-to-center

distance stroke of the duble chain looper or

lower looper, and decreasing the stroke.

will

distance

give a smaller

will give

larger

II

ll

·I'

I

-11

-

·1

I

Standard Adjustment

(5) Adjusting the

1) Returning amount

lower

looper

of

the lower looper

The distance between the blade point

looper

lower

and the

center

of the needle

should be as follows when the lower looper is at the extreme left of its stroke.

of

the

.:.::

8

~

(D

>

C:

o:c

Cl>

u

-

"'

ie

Cl>

c;=

.:.::

8

ii

(D

> C

o·-

..92

'g

je

C

(\I

~

<D

.:

C

~~

QI

"'

-e

t8

,.

•

C,

Og

:E

a,

U)

6604S{R)

MO-

SD.OSS

MO·

6604S{R)-

MO-

6604S

6

MO-

'°'

14S(R) •

MO-

6614S(R) -806

MO-

66125

MO-

6612S

6616S(A)

MO·

MO- 6.t).16S(R)

MO·

6616S(R) MO- 6943R MO-

6643S

MO-

6903G

MO-

6904G(J)

MO-

6905G

MO- 6914G(J)

MO-

6916G(J)

Model

OAS

·OA4

006

OF4

OF6

OH4 0D4

•

OF6

B04 to BE4

B06

BE7

-CE4

·DF6

-66.0.

BE4

-00/.\ F66

·F66

-666

-6.6.6

-ON6

·OF6

-OM6

-CHS

-F66

156

·210

to

OE4

3t).~ 3t).O

500

SOM

toOE4

46H

.

50H

-3lH

to

BES

20H

to

BFS

4uH

·40H

50F

507 2.2

360

500

46.H

.

56H

-60H

-6.67

-.ti.6.H

-301 1.4

-700

-760

-700

(Unit: mm)

Dimension8

4.0

3.7

3.8

4.0

3.7

3.8

2.8

3.8

3.5

1.3

..

3.3

3.5

-

2) Clearance between the lower looper and the needle

The clearance should be O to 0. 1 mm.

0to0.1

mm

J

- 12 -

Adjustment Procedures

Results of Improper Adjustment

1) Returning amount

CD

Loosen setscrew • of lower looper support arm 8 lower looper 8 to make adjustment of the returning amount.

(Referential information)

1. Radius 8 of lower looper 8 will

looper is inserted into lower looper support arm O until it contacts with stopper pin O and then is fixed.

2. The rocking angle

(M0-66665,

The rocking angle of the lower looper will

(M0-6966G,

R)

J)

of

the lower looper

be

66.9

of

the lower looper will

and

mm

when the lower

be

2s·.

be

32·.

adjust

o Excessive return of the lower

looper skipping when filament thread is used.

o Insufficient return of the lower

looper tends to cause needle

thread

spun thread is used.

tends

stitch

to

cause· stitch

skipping

when

2) Clearance between the lower looper and

MO-6700S Series

CD

Loosen setscrew 8 of lower looper support arm O to the extent that it is temporarily tightened. Now, make the adjustment by

moving lower looper support arm 8 back and forth.

MO-6900S,

CD

Loosen setscrew 8 of lower looper support arm 8 to the extent

that it position of the looper using fine adjustment screw O.

R,

G,

J Series.

is

temporarily tightened. Then finely adjust the longitudinal

the

needle

® Turn fine adjustment screw 8 clockwise to move lower looper

G away from the needle.

Tum the screw counterclockwise to move lower looper 8 closer to

it.

-13-

o Excessive clearance will often

cause skipping.

o Insufficient clearance will cause

needle contact of the looper with needle, the blade point of the looper.

leading

breakage

needle

breakage

or

thread

due

produce scratches on

to

needle

or

other troubles.

thread

stitch

to

the the

Standard Adjustment

(6) Position

Vertical position : To

be

in

close contact with

Laternal position

To

be

pressed

gauge

8.

Q)

c::

MO·

S.604S(R)

£

co

6.605S

E

~

8

'C

MO-

66.04S(A)-OF6

~

a,

'g

a,

M0-6.l!:.045

~

6614

a,

MO·

C

:c

0

t'G

MQ.

E

6614

~

8

'C

a,

MO-

MO·

6612S

6.6.12S

>

0

Q)

=o

a,

Q)

C

"'

of

the upper looper g~ide

the

frame

:

against

the

upper

looper

0

Frame

(Unit: mm)

Model

OAS

-OA4 006

OF4

OH4

004

·OF6

BD4toBE4

S(R)·sos

S(R}-806

BE7

-CE4

·DF6

lo

OE4

to0E4

to

BEG

to BF6

15A

-210

3.6A 360

-500

SOM

4AH

50H

-3.6.7

20H

0

4.llH

-40H

507

0

SOF

Dimension

a-i

~-3

@~

[f]

!...;6

,~

~7

ffil

guide

Ci)

surface.

support

surface

Upper

looper

guide support gauge

MO-

a,

C

:E

0

co

MO·

E

..c:;

g

MO·

~

?:-

.S!

co

Cl)

MO.

MO·

MO.

MO-

""')

cj

MO• 6905G

0

CJ)

CD

6

MO· 6914G(J)

::E

MO- 6916G(J)

&St

13131909

11

11545100

Modef

6.6.16S{R)

6/\16S(R)

6A16S{R)

6943R

6.6.43S

6903G

6904G(J) -OF6

-6.Ab.

BE4

-00.6.

F.6..6.

-F.6.6

-61.).A

.,6_1.),,6,

-ON6

-OM6

-CHS

-f66

(Unit: mm)

~7

5.8

13132006

~

12375606

(Unit:

Dimension(B

360

500

46H

-

SOH

-60H

-D.D.7

-6D.H

-301

-700

-1.6.0

-700

E@

~y

r,s.s

[iliJ

~

i

[iJ

~~~

ff:

u~

mm)

3

-14-

Adjustment Procedures

1)

Fit

upper looper guide support gauge 8 over gauge fixing pin

0 which has been driven in frame 8 and secure the gauge

with

an

O ring.

Then position the gauge taking the marker dot engraved on

or the chamfering direction as reference.

2)

When installin upper looper guide support 81 press the gauge close contact with the frame guide surface, then tighten the

screws.

(Caution) Refer to "4- (4) -1) -

various sealants.

while keeping the upper looper guide support into

(J)

Various sealants" for the

it

against

Results of Improper Adjustment

o If the upper looper guide has

improperly positioned it

will

cause

it

disturbed path

looper

skipping.

o If the upper looper guide has

been inaccurately positioned

laterally. skipping, looper.

oil

with

resultant

it

will

or

contact with the

vertically,

leakage

of

the

cause stitch

or upper stitch

-15-

Standard Adjustment

(7) Positioning the upper looper holder

The distance between the bottom surf ace of the frame and the upper end of the upper looper holder

8 should be as shown below when the upper looper holder O is at the highest point of its stroke.

(Unit:

53mm

t

0

l

Bottom surface

llt(tllfl(llltltl((l/1

of

frame

•

-~

1

8

'C

CS)

{:;

~

m

J

CS)

~

u

~

.g

a,

>

0

Cl>

=a

G)

Cl>

~

(\I

GI

C

:c

u

as

E

.c

.B

",ID

en

2:-

.S!

a,

(/)

Cl>

-~

GI

Ill

-,_

(!J

0 0

en

C0

6

:E

MO-

MO·

MO-

,-.

MO-

Model

OAS

SLl.04S(R) 6Ll.05S

M04S(A)·

6.!i.04S

6614S(R)·

6.ll.125

6ll.12S

66.16S(R)-6/\l\

6Ll.16S(R)-

6616S{R)

6943R

6643S

6903G

6904G(J)-OF6

6905G

6914G(J)-CH6

6916G(J)·FD.6

-OA4 006

OF4 OF6

OH4 004

•

OF6

B04 B06toBE6 BO~ BE7 4.ll.H

-CE4

-DFG

·F

-D.bD.

-D.66

-ON6

-OM6

BE4

006 Fll.D.

D.6

to

OE4

toOE4

loBE4

to

BF

. -

Li.

156

·210 3All. 3ll.O

-500

SOM

46H

50H

·3ll.7

20H

•

·40H

507

-

SOF

3l:.O 500

4.ll.H

5Ll.H

-60H

·6.D.7

-6.ti.H

-301

-700

·1/:J.O

-700

Dimension&

45.0

462

482

47.3

48.4

46.8

46.9

46.2

48.2

4B.4

47.3

48.4

512

50.7

51.7

49.3

48.B

mm)

--

-

-16-

Adjustment Procedures

1) Loosen the setscrew of upper looper ball arm O and setscrew

0 of the upper looper holder.

2)

Adjust the clearances between upper looper bracket 8 and

Oto

upper looper holder and tighten setscrew (Make sure that the upper looper holder smoothly moves together with upper looper shaft

3)

Then determine dimension O from the bottom surface of the frame to the top surface of upper looper holder pin tightening the setscrew of upper looper ball arm

(Caution) Replace upper looper holder 8 according to the

needle gauge size.

approximately 0.2

O of the upper looper holder.

O.)

mm

respectively,

8.

8 before

Results of Improper Adjustment

o Inaccurately positioned upper

looper

excessive

upper looper, resulting in stitch

skipping,

(Caution) To adiust the upper

looper

dimension Remember that the projecting

amount and the

upper

eventually

adjusted.

dimensions upper looper.

holder

or

ball

looper

will

projection

other troubles.

arm,

O

as

height of the

be

So,

confirm

related to

cause

of

the

take

standard.

should

properly

the

l'I

:1

!I

II

I

l'

11

I

-17-

I

II;.

'

~

F

Standard Adjustment

II

I

I!

ii

I

i

j

I

j

II

'1·

ii

!

t

l

(8) Positioning

the

upper looper

1) Height of the upper looper

The

distance between

when

the

upper looper

2) Longitudinal position

G)

The clearance between the upper

and lower loopers

when

they cross with

® The clearance

and

the needle should

the

is

of

the upper looper

should

between

throat

plate

surface

at

the

each

extreme

be

0.1

other.

left

to 0.2

the upper looper 8

be

o to

0.2

mm.

of

mm

and

its

the

travel.

"g

"im

is

a>

ti

'g~

Q)

:r

~

u

0

"C

Q)

l>

~

Q)

-

alE

Q)

C

"'

--

Cl>

C

:E

u

t'O

E

.c

j:1

--=

C/l

~

tU

Cl)

0

c:J

·c:

CD

VJ

~

0

O>

co

6

~

blade

11)

u

co

point

of

the

Model

MO-

6804S(R)-L\L\L\

MO-

6604S

-L\l::.l::.

MO-

6/\05S

-!:l.66

MO-

Bli

MO- 6614S(R)-8E

MO-

~

MO· 6616S(R)

MO-

6943R

MO-

6643S

MO-

6903G

MO-

6904G{J)

6905G

MO·

MO· 6914G(J) -CHS

MO-

6916G(J} -FL\6

B04

145

lR)·sos

BO6

6612S

6L\12S -DF6

6616S(R)

16S(A) -

-CE4

-666

BE4

D06

F6A

-F

b.6

-/\~6

·L\L\6

-ON6

-OF6

-OM6

looper

to8E4

to

BES

to

BF.6.

7

should

660

-6.66

SOM

-l::.l::.H

-6illi

·307 20H

4!::.H

-40H

507

50F

-L\60

4/\H

5~H

-60H

·L\L\7

·L\L\H

-3D1

•700

·760

-700

be

as

{Unit:

Dimension

11.0

11.3

10.3

11.0

11.B

11.0

11.3

12.8

10.3

11.0

13.6

13.7

12.0

12.9

13.7

follows

mm)

Ci)

0.1

to 0.2mm

7

Lower looper

•

-18-

~

__

---

:s:

l

Adjustment

1)

Height of the upper looper

CD

Set a hexagon screwdriver onto setscrew 8

looper bracket

O to adjust height

Procedures

f).

at

the

end

of

upper

@ When adjusting the height, pay attention also to the clearance

produced between the upper looper and the lower looper at the time of their crossing.

Results

o

o On the contrary, if the upper

of

Improper Adjustment

If

the upper looper has been positioned excessive clearance will produced between the upper looper and the needle. result, the upper looper thread

will

fail to catch the

thread,

occurs.

looper has been positioned too low, the needle point

looper, breakage. Also the looper will touch other component when the presser foot goes up .

too

and

stitch

causing

high,

As

needle

skipping

will

hit the

needle

an

be

the

......

··

2)

Longitudinal position of the upper looper

CD

Loosen setscrew 8 at the top end of upper looper bracket O to move upper looper O clearance of lower looper at the time to 0.2

0.1

to 0.2 mm between the upper looper and the

mm

between upper looper O and the needle.

back

or

forth for positioning the

of

their.

crossing or the clearance of O

-19-

o Excessive clearance

stitch skipping.

o Insufficient clearance will cause

. the upper looper to come in

contact with the lower looper.

will cause

Standard Adjustment

(9)

Adjusting

the

double

chain

looper

(Applicable only to M0-6.616S/6916R, G, J series)

1) Returning amount of the double chain looper

The

distance between the needle center

to 2 mm

when

the_

looper

is

at the extreme left of

and

the

blade point of

its

travel.

the

double

chain

looper should

be

1.5

M0-691

2) Longitudinal motion (Avoid motion)

The

3.0

mm

3.5

mm

Note : The avoid

SG,

J

series

standard minor

(M0-6~ (M0-691

16S, R).

BG,

motion

axis

of

the

elliptical motion

J).

should be adjusted in accordance

M0-661651 R

should

be

series

:

Marller

with

•

(63.4mm)

Needle No.

__

,.,---------\

(\.

I

l-~

3) Clearance between the double chain looper and the needle

The

clearance should be

0.05

to

0.1

o.os

mm.

to

o.

1 mm

-20-

~j

Marker Hole 8

Adjustment Procedures

Results

of

Improper Adjustment

1) Returning amount of the double

chain

looper

(D Loosen setscrew 8 of double chain lopper driving arm O to

make this adjustment.

@ Radius

63.4 mm when

(I

of the double chain looper driving arm 8 will be

it

is lowered until it comes

in

contact with stopper

pint,.

@ For M0-6916G,J type machines,

the tilt to

2)

Longitudinal motion (Avoid motion)

(i)

Open the cover of the adjusting hole

loosen setscrew the adjustment by turning the rod back and forth.

Marker:

Marker

1.6 mm.

0,

and put a

This

side

.....

Minimum (for standard

.

: Far

side

· . .

.....

Maxunum

(for

ttuck

radius®

02

rod

to

thin

needles)

will be 63.2 mm.

8.

Adjust

on

the rear of the frame.

in the hole. Now, make

needle)

e }

As

observed

from

C)

this side

o Excessive return

chain looper will cause frequent

stitch skipping when filament

is

thread

used.

of

the double

o Insufficient return of the double

chain

looper

will

cause frequent thread stitch skipping when spun thread is used.

o

If

the avoid motion is too large, triangle stitch skipping occur.

will often

Bad needle

-----~entry

Good needle

entry

a

3)

Clearance

(i) Temporarily tighten setscrew

and finely adjust the longitudinal position of the double chain looper. Adjust the clearance to

M0-6916S,R series only

between

the double

chain

looper

fJ

in the double chain looper,

0.05 to

0.1

mm.

and

the needle

® Turn fine adjustment screw O clockwise to move the double

chain looper away from the needle. Turn

it counterclockwise to move the double chain looper closer

to

it.

o Insufficient avoid

cause the needle point to hit the looper, producing scratches on the needle point or looper.

motion

will

o Excessive clearance will cause

frequent needle thread stitch

skipping.

'.:>

Insufficient clearance will cause

looper

to leading to needle breakage scratches point breakage.

to

hit the

on

the looper blade

with consequent thread

needle,

or

-21

-

Standard Adjustment

(1

O)

Adjusting the height and clearance of

1) For 1-needle or 2-needle overlock machine

Make

needle guard e lightly come

mm)

when the blade point of the lower looper reaches the needle center.

The clearance between needle guard

point of its stroke.

The

height of needle guard

CD

is 1

in

contact with the top end

Ci)

and the needle

mm

from the throat plate bottom surface.

the

needle guard

is

0.1

of

needle (bend needle

mm

when the needle is

by

o to 0.05

at

the lowest

Needle guard Q

(Traveling needle guard)

2) For safely stitch machine

The

safely stitch machine

positioned in the same manner

The needle guard

Cl

should be positioned 5

has

four needle guards,

as

those for the overlock machine.

Needle

Throat

plate

•

e,

CD,

(9

and

{i).

The

needle guards e

mm

below the throat plate bottom surface.

guard

@)

and

1

mm

6)

are

Throat

plate

==-~--===~_;r-~;=::_J_

-22

5mm

-

Adjustment Procedures

1)

For

1-needle

CD

Adjust needle guard e with setscrews O

so

that

by

Oto

reaches the needle center.

®

To

adjust needle setscrews 8 in to

adjust

@

Adjust

bottom

or

2-needle

it

lightly comes

0.05 mm) when the blade point of the lower looper the

clearance

when

the

needle

the

clearance

the

height

of

surface

w~h

overlock

in

contact

provided bar

is

at

needle

guard

to

0.1

mm.

needle

guard

setscrew 8 in

machine

with

between

the

IONest

support

CD

the

the needle

needle

point

and

to 1 mm

needle

in

the needle guard

(bend

needle

guard

CD

and

of

its

stroke,

loosen

tum

needle

guard

from

the

throat

guard.

the

CD

plate

Results

o

o A clearance left between the

o

of

Improper Adjustment

Excessively the needle guard

needles

or

stitch

needle

will

cause

come

leading breakage, If

the thread resultant stitch skipping. Also, double causing double chain stitch

dose

contact

will

lead

to

needle

skipping.

guard

6'

and

the

looper

blade

in

contact

with

to

needle or blade point

or

other

troubles.

needle

guard

CD

loops

will

be

damaged

chain

loops

will

between

e and the

bend

the

needles

point

to

the

needles,

is

too

high,

with

be

affected,

skipping.

o

If

the

needle

guard

t)

is

too

low,

the needle cooling felt will be lowered, effect guard.

o

Excessive needle cause shake. clearance guards to catch the needles between the on

resulting

of

the cooling

guard@)and

stitch

On

them,

needle

the

needles.

in

clearance

skipping

the

contrmy,

will

cause

leading

guards

and

deteriorated

and

needle

between

the needJe

due

to

needle-

insufficient

the

needle

to

wear

scratches

the will

on

2)

For

safety

stitch

machine

clearance provided between needle guard so

that it lightly comes

by

o to 0.05

®

Adjust

8

in

the

@

Adjust needle

(Caution) Check again the clearance

guard guard&.

the

needle

the

to

CD

0.1

and

installing

mm).

guard.

clearance

mm

the needle after

height

provided

with

in

contact

of

needle

setscrews

with guard

between

O.

adjusting

provided

Ci

and

the needle

the

needle (bend needle

(9

to 5 mm

needle

the

with

guard

(!)

between

height of needle

setscrew

and

the

needle

o

If

the

needle

guard

(tis

too

high,

the

needle thread loops will be damaged, occur. points

o If the clearance between the

needle is

too blade the

needles, of the needles, causing the breakage

blade

No

clearance cause close wear scratches

o

Excessive

the needle guard

needles due to insufficient needle

between

the

needle

on

the

and

stitch skipping

If

it

is

too

low,

will

be

crushed.

guard 8 and

large,

the

double

pcint

will

come

causing

of

the

needles

point.

left

between

them

tooome

contact

with

each

on

the needle guard on

the

needles

clearance

will

cause

needle

clearance

guards

to

catch

them,

leading

guards

needles.

the

needle

the

needles

chain

In

contact

the

breakage

or

them

in

excessively

other,

will

left

between

CD

and the

stitch

skipping

shake,

wiU

cause

the

needles

to wear

and

scratches

boper

with

looper

will

and

occur.

and

the

on

-23-

Standard Adjustment

(11) Adjusting the height

The height of main feed dog O from the top surface of the throat plate O should it is

at its highest posion.

Needle A

8

entry

I

'

of

the feed dog

Model

MO-6.600S Series

MO-6904G Series MO-6914G Series MO-6916G Series

•

Auxiliary feed dog 8 is 0.5 mm lower than main feed dog &.

-05mm

• •

be

as follows when

(Unit: mm)

Dimension A

-

1.0

1.3

1.2

1.1

(12) Adjusting the

Tilt

of

the

feed dogs when

have

come

up

most.

Model

MO-6.t!:.0OS

M0-6904G Series

MO-6914G Series MO-6916G Series

Series

tillt

of

the feed dog

the

•

Dimension

1.0

1.3 (1.5)

1.2

-

1.1

feed dogs

Front up

(Unit:

A

DimensionB

(1.2)

(1.4)

(1.3)

mm)

When

the

feed dog

the throat plate

Top surface

thethr\pla~

of

iuts

out

the

top

Feed dog

leveled.

N\MI\

surface

is

of

-24-

AdJustment Procedures

1)

Adjust the height of main feed dog 8 to dimension A with o setscrew

2)

Adjust the height of differential feed dog 8 with setscrew O so that there is no difference and differential feed dog

3) Adjust the height of auxiliary feed dog that it is 0.5

0.

8.

mm

lower than main feed dog

in

level between main feed dog 8

8 with setscrew O so

8.

Results of Improper Adjustment

If

the feed dogs are too high, the needles will be deflected and broken weight materials. The feed dogs will when materials. frequently occur.

o If the feed dogs are too low,

insufficient

result

o If the auxiliary feed dog is too

high, chain-off thread often jammed.

o

If differential feed dog are set at different differential feeding action will be hindered.

when sewing heavy-

tend

to

suffer

the

sewing

main

light-weight

Puckering

feed

heights,

scratches

will

power

will

dog

proper

will

and

be

1) Use the tilt of the feed dog when it

reference plate when

2) Feed setscrew

When the marker line is set at middle

..... The feed dog will be flat.

When the marker line is set at bottom

..... The feed dog will be tilted with its front

When the marker line is set

..... The feed dog will be tilted with its front down.

(Caution) The marker line should be used just as the reference

since it slightly differs with that of each machine the disparity of the components.

Confirm the accurate

and

adjust so that the feed dog is flush with the throat

the

feed dog juts out the throat plate.

bar

shaft O consists of an eccentric shaft. Loosen

t)

to

perform adjustment.

direction).

tilt

of

at

top

the

is

in its highest position as a

up

(in the arrowed

due

feed dog

by

observing the

feed dog itself.

c When tilted with the front

Good material catching will be obtained.

o When tilted with the front down

Uneven feed and puckering

be effectively prevented.

to

up

will

-25-

Standard Adjustment

(13) Adjusting

the

MO-6000S, R Serlse

Center

of

nut

Lower

marker

line

(Standard)

Gathering:

Stretching:

1: 2

1:

MO-69000, J Serise

Halfway

between

upper

marker line

and lower

line

marker

differential feed ratio

{Max,

Gathering:

0.7

Stretching: 1 :0.6

marker line

at its highest

position

stretching)

1:1:s

Washer

(Max, gathering)

Gathering:

Stretching:

Pin at its lowest

1: 4

1 : 1.3

•

(M06904G (J}, M06916G (J))

Gathering: 1: 1.

Stretching: 1:

75

0.6

(14) Longitudinal position

When

the

feed

pitch

is

maximized

the

front

and

rear

ends

of

the

respectively.

(M0-6914G (J))

Gathering:

Stretching: 1 :0. 7

of

the feed dog

and

the

feed

dog,

and

E

U)

d

E

&.n

d

1 :2.0

differential

feed

the throat plate

ratio

should

is

also

maximized,

be

spaced

the

clearanc.es

approximately

0.5

of

mm

-26

-

Adjustment

Procedures

Results

of

Improper Adjustment

lll

11

1) Remove cover O on the rear of the frame and loosen main

feed pin and nut

2) Move main feed pin 8

feed ratio.

3) Adjust so that the lower engraved marker line on main feed

rocker 8 aligns with the center of nut

4)

When adjusting the maximum stretching, adjust main feed pin

8.

up

or

down to adjust the differential

8.

(Standard)

8 to the highest position.

5) When adjusting the maximum gathering, adjust main feed pin

8 to the lowest position.

6) After performing adjustment, tighten the main feed pin and nut

0,

and install cover

O.

II

11

I~

Iii

j

I.

•I

·I

1) Remove the cover on the rear of the frame, loosen main teed

. '

..

·

bracket clamping clamping screw the front and rear ends of the feed dogs and the slots throat plates to approximately 0.5 mm. Then tighten main feed bracket clamping screw

clamping screw O and differential feed bracket

screw

O and ~ifferential feed bracket

0,

and adjust the clearances provided between

8.

in

the

o

If

the

clearance between the throat plate and the feed dog is too small, they will come

in

contact with each other when the sewing machine runs at high speed.

provided

-27-

i•

i

I

!· !

Standard Adjustment

II

I:

1;

l!

1

11

II,

ri

'!

l

jl

I

1·

1.

I,

!

I

(15) Adjusting the presser foot

1)

Adjusting

The

pressure,

the

presser

and

tilt

of

the presser foot

foot

should

the

presser

be

positioned

foot

sole

0

Throat plate

so

that

comes

the

in

cont~ct

X

feed

dogs

evenly

go

with

down

the

under

throat

the

specified

plate

surface.

X

presser

foot

2) Adjusting

the

micro-lifting mechanism of the presser foot

-28

-

Adjustment Procedures

Results of Improper Adjustment

1) Adjusting the tilt of the presser foot

CD

Turn the handwheel and place the feed dog where

the

feed

dog

does

not

jut out the

plate.

®

Loosen comes tighten setscrew

(Reference) Accurate adjustment can be made by using two

pieces

In addition, even contact of the presser foot with the throat

plate top surface is achieved rather easily the screw while pushing the right side of the presser foot.

setscrew O and adjust

in

contact evenly

with

the

O.

of

thin paper to check for even drawing-out tension.

top

so

that

throat plate

in

the position

surface of

the

presser fopot sole

top

the

surface.

by tightening

throat

Then

o

Uneven

straight power, or puckering.

contact

material

will result

feed,

weak

in

bad

feed

2)

Adjusting the micro-lifting mechanism of the presser foot

G)

When

moving

fine adjustment screw O.

presser lifting lever 8 just a little, perform

it

with

-··

29

-

11

Standard Adjustment

I

II

11

·I

I

(16) Positioning· the upper knife arm shaft

The upper knife shaft should at

its highest position.

M0-6616S(R)-F

.66-60H : 35 mm

be

positioned

34

mm above the top surface of the throat plate when it is

(17) Positioning the upper and lower knives, and available overedge widths

1)

Lower knife

2)

Upper

knife

3)

Overedging

Overedging width can

width

be

adjusted from 1.6 to 6.4 mm.

-30-

Adjustment Procedures

Results of Improper Adjustment

1) Remove the upper cover, loosen setscrew 8 in upper knife

driving arm from the top surface

(Caution)

knife shaft 8 is subjected to high load.

0,

and tum upper knife shaft

of

the throat plate

Be

sure to fully tighten the setscrew since upper

Oto

adjust the position

to

34 mm.

Improperly

o

knife contact with the frame. If it is moved with the position the

upper proper knives prohibiting sharp cutting of the knives.

positioned

arm

shaft will

knife

engagement

will

be

come

unchanged,

disturbed,

upper

of

the

in

of

1) Lower knife

(j)

Adjust the vertical position that the blade top aligns with the top surface of the throat plate.

of

the lower knife by screw 8 so

® Tighten screw 8 after bringing the upper knife to its lowest

position of its stroke.

2)

Upper knife

(j) Adjust the position of the upper knife

engagement with the lower knife is 0.5

knife is in the lowest position of its stroke.

(Caution) Adjust the lateral position of the lower knife

8.

Adjust the lateral position

8.

After performing adjustment, be sure to fix the knife.

Otherwise, the durability of the knife will be affected.

3) Overedging width

G)

Adjust the overedging width in the following Laterally position the upper knife before loosening screw Tighten screw under

adjustment procedure to obtain desired overedging width.

the

8 when the upper knife has settled by itself

pressure

applied

by

screw 8 so that the

to

1 mm when the upper

by

of

the upper knife by screw

way

;

by'

the

spring.

Repeat

screw

&.

this

o The lower knife. if positioned too

high,

will

catch

materials cause no contact of the presser foot with the throat surface.

o If the lower knife is positioned

too low, the cutting width changed caught by the lower knife.

o The upper knife,

high, will fail to cut materials.

o Unsharp cutting or abnormal

wear

unless the lower knife is laterally positioned and fixed at a position

where

under the upper knife spring.

or

on

the

it

has settled

materials

if

positioned too

knives will result

plate

will

by

or

top

be be

itself

-31

-

Standard Adjustment

(18) Resharpening

(19)

Position

1) Adjustment

of

the

of

the knife

Lower knife gauge

Part

No.

11996907

10Yf'

thread cam

(Applicable

•

only

to

M0-66166

Level

series)

M0-6.6.16.6. series

2) Adjusting looper thread cam thread guides A and B

and

the looper thread cam nail

-32-

Adjustment Procedures

Results of Improper Adjustment

1) When the knives have become dull, fully resharpen lower knife

0 until the contact mark of it disappears.

2)

When the upper knife has become dull, replace it with a new one. {This is

knife.)

1) Adjusting the thread cam

CD

Adjust the position of the thread cam the needles at their upper dead point so that the straight section of the thread cam is leveled.

CV

Laterally position the thread cam so that the looper thread cam nail is located

[How

to

check for proper positioning]

Check that the thread needle tip begins to plate by

o to 1 mm.

because

at

the

upper

the center

cam

come

of

the thread cam groove.

releases the looper thread when the

out of the bottom surface

knife is a serrated carbide

by

its setscrew G with

of

the throat

o

If

the 1

o·

angle of the lower knife is exceeded, knife will be deteriorated, often resulting in blade chipping.

o

If

the angle is smaller

the knife will be dull.

o If the 55• angle is not observed,

the knife may catch materials.

o

If

the timing

is

too early, the needle point will

fail

to resulting skipping.

o If the timing

is too late, puckering and loose looper results.

the durability of the

of

the thread

enter

a thread triangle,

in

looper thread stitch

of

the

thread cam

thread

stitches

than

10·,

cam

will

Thread

Throat plate

' I

~~m

2) Adjusting the looper thread cam thread guides A and B and the looper thread cam nail

G)

Install

looper

thread cam thread guides A 8 and B 8 at the

of

center

the slots with setscrews A 8 and B

@ Install looper thread cam nail 8 with setscrew 8 so that the

straight section of the forked portion is leveled.

C,.

o If the chain looper thread guide

away

is moved take-up looper thread will decrease. In this case, puckering there by impairing the feeling of the finished product.

amount

from you,

of

the

may

the

lower

result

-33-

Standard Adjustment

(20) Adjusting

(21) Adjusting

the

throat plate support

the

feed mechanism cover presser

the

looper cover

should

smoothly

with

upper

close

without

knife O in

coming

its

lowest

in

contact

position

i

I,

ii

I

l

!

I

(22) Adjusting

o

The

looper cover

closing looper cover 8

I

II

Frame

I

-34-

I

of

with

its

upper

troke.

knife O when

slowly

lj

Adjustment Procedures

1) Loosen setscrews should

not

contact with throat plate

1) Loosen setscrew 8 and press feed mechanism cover presser

O and adjust so that throat plate support 8

come in single-sided contact but come in uniform

8 using setscrews

O.

8 in the direction of arrow.

2) Press feed mechanism cover 8 and tighten setscrew O so

that the feed mechanism cover should not rise.

Results of Improper Adjustment

o If the throat plate support comes

in single sided contact with the

or

throat plate contact with it, the throat plate will vibrate severely.

o If the feed mechanism cover is

not fully pressed and the cover rises, oil leakage will

does not come in

be

caused.

I

!

I

11

ii

·.I

I

11

(Caution) Check

that

it

should not rise.

1) Close looper

cover guide plate brought to a position where the cover smoothly closes.

2) Move looper cover guide plate with looper cover receiving bracket

by tightening setscrew

that

feed mechanism cover O is pressed

cover

8,

loosen setscrew

8,

and move looper

8 back and forth until the looper cover is

8 until it slightly comes in contact

C,.

Now, fix the guide plate

9.

so

ii

.I

I

-35-

I

Standard Adjustment

(23) Adjusting the cloth chip cover

o

When

cloth chip cover 8

In

addition,

the

cloth

chip

is

pressed

cover

should

away

not

from

come

you,

in

contact

it

should

with

not

rattle.

upper

knife 8 and

lower

looper

8 .

(Located Inside)

•

0

-36-

Adjustment Procedures

1) Loosen setscrew O and temporarily tighten the setscrew with

cloth chip cover stopper O raised.

2) Loosen setscrews 8 in the cloth chip cover, and adjust the

longitudinal position of cloth chip cover

3)

Loosen setscrew O in the cloth chip cover stopper again, and press cloth chip cover stopper

slightly comes in contact with looper cover setscrew

4)

Finally, confirm that cloth chip neither upper knife 8 nor lower looper

0.

C,

cover•

O.

downward until the stopper

8.

Now, tighten

comes in contact with

8.

Results

of

Improper Adjustment

i

I

ii

I,

11

t

I

-37-

'1-,

11

,1:

I,

Standard

Adjustment

(24) Adjusting

1. Disassembling

the

needle mechanism

2.

Adjustment

;----

•

-38-

Adjustment

Procedures

1. Disassembling

1) Remove top cover 8 and side cover

2)

If

packing

also remove packing

3)

Remove needle front plug

4) Loosen setscrew needle lubricating pin

5) Remove needle bar upper bushing cap screw

setscrew

6) Fitting needle drive pin 8

the pin until it can be drawn out.

t)

of the top cover has been adhered on the frame,

0.

CD.

(I

of needle lubricating pin 8 and remove

8.

41

in

the needle drive pin.

in

the hole on the frame side, thrust

O.

(I

and loosen

Results

of

Improper Adjustment

2.

Adjustment

1)

1;3ring

needle bar O to the lower dead point.

2) Adjust oil wick e in needle drive pin 8

flush with the chamfered plane of the pin. (If oil wick O sinks inside the chamfered plane as the concave, oil will not be fed smoothly.)

3) Install needle lubricating

above.

4) Adjust with setscrew ti)

lubricating pin 8 and needle drive connecting link O is mm. (It is convenient to use a like.)

8 in place with its oil inlet O faced

so

that the clearance between needle

0.1

so

that it should be

mm clearance gauge

or

0.1 the

o If the oil wick is installed in the

needle drive connecting link pin inside the pin as the concave, oil will not lubricated properly

resulting in seizure.

o If

the

clearance between the needle lubricating pin

and

the

connecting link is too small, the

related components will come

contact with each other.

o

If

the

clearance between the needle lubricating pin

and

the connecting link wll not be fed properly resulting in seizure.

o If

the

oil inlet

upward,

resulting in seizure.

oil

provided

needle

provided

needle is

too large, oil

does

will

not

be

drive

in

drive

face

fed

-39

-

!II

I

l

i

!

l

ii

'I

I·

Standard Adjustment

(25) Position of the upper looper lubricating pin

' I

j

'

I·

1) Orientation

Oil

inlet 8 of upper looper lubricating

2) Setting the lubricating pin

The clearance provided between upper looper lubricating

be

0.15

of

the lubricating pin

mm.

pin 8 should

face

upward.

pin 8 and

upper looper bracket 8 should

0

'.1

I

·;

0.15

mm

clearance

-40-

II

Adjustment Procedures

1)

Orientation of

CD

When upper looper lubricating pin O is set with oil inlet 8 faced upward, lubricating hole O is in the lower section as observed from this side.

2)

Setting

CD

Remove the oil reservoir, loosen the setscrew and adjust the clearance provided between upper looper lubricating pin and upper looper bracket 8 to 0.15 mm using a clearance gauge

the

lubricating pin

or

lubricating pin

0.1

the like.

O

5mm

Results

o If the oil

o

of

Improper Adjusbnent

inlet

does not face upward, resulting in seizure.

If

the between lubricating pin and the upper looper bracket is too small, the related components will come contact with each other.

If

the between lubricating pin and the upper looper bracket is too large, oil will seizure.

oil

clearance

the

clearance

the

not be

will

upper

fed

not

be

provided

looper

provided

looper

resulting

fed

in

I

i

I

-41

-

(26)

Longitudinal

momentum

StaAdard Adjustment

of

the

top

feed

dog

(Top feed amount)

Longitudinal momentum

(top

feed

Longitudinal

Standard

M0-6916R-F

MO-6900J

amount)

momentum

~6-6L\H

Increases

of

the

top

feed

(top

Max.

dog

feed

7.5mm 7mm

7mm

Decreases

is possible

amount)

Min.

1mm

2.5mm

2.7mm

up

to

7.5

mm.

(Caution) Motion of

longitudinal momentum (top feed amount)

the

position

the

top feed is

of

top

not

feed lever

interlocked with the motion

of

the

top

feed

8.

-42-

of

the bottom feed. The

is

determined only by

Adjustment Procedures

1)

Changing the longitudinal

of

the top feed

G)

Loosen top feed lock nut

direction of the arrow mark to adjust the stroke.

dog

® When top feed fine adjustment screw 8

to slightly move top feed lever

2) Changing the maximum momentum

CD

Loosen setscrew O and lower the stopper to increase the maximum momentum and raise the stopper to decrease

in

momentum

Ct

and move top feed lever 8

(top feed amount)

in

the

Is

used, it Is possible

8.

the differe~tial feed adjustment stopper

it.

® After the adjustment, securely tighten setscrew 8 in the

differential adjustment stopper.

3)

Changing the minimum momentum

CD

Loosen setscrew • in the differential feed adjustment stopper and lower the stopper to increase the minimum momentum and

raise the stopper to decrease

it.

® After the adjustment, securely tighten setscrew 8 in the

differential adjustment stopper.

Results

o If the min. stroke

o

of

Improper Adjustment

is

decreased

mm

to 1 mounted inside the machine head may come among therefore necessary to set the min. stroke to 1 mm or more.

If

to 2.5 mm stitch machines of 50H type, the come looper necessary to set the min. stroke to aforementioned machines.

or less, the components

In

contact with

one

another.

the min. stroke is decreased

or

less

for

safety

or

top

feed

dog

in

contact with the upper

holder. It is therefore

2.5

mm

or

more

for

types

It

is

60H

may

the

of

-43-

Standard Adjustment

(27) Vertical momentum of the top feed dog

Relation between the position

of

vertical adjustment pin

and the vertical momentum

Vertical

Adjusting position

Striking

to

end of groove.

Marker

line position A

Marker line position B 6.5mm

1

to

1.5

mm

on

1his

side

from

striking

to

end

of

groove

* In

case

of adjusting

adjustment screw

the

8,

check that the pin does

momentum

3.5mm

5.0mm

8.5mm

position

of

not come in contact with upper knife support, needle clamp, etc. Then securely tighten vertical adjustment screw

8.

0

Application Light

weight

materia!

Light·

to

medium·weight Medium· Extra heavy·weight materials

to

heavy.weight materials

vertical

Striking

materials

to

top

end

of groove

Marker line

position

Marker line position e

1

to

1.5

striking

mm

to

A

top

on

this

end

side

of

groove

from

Vertical adjustment arm

Assembling position

Move

exhaust

to

the

right

(Screw

: left

of

locus cut

slot

side

of

ove

crew : right

mm

support

slot)

__..

locus

base

and exhaust slot support

8

cut

base 8 to

side

of

the left.

slot)

Check that the locus cut screw is adjusted to the position (almost the center) of the aforementioned

dimension of the vertical adjustment arm support section.

-44-

Adjustment Procedures

Results

of

Improper Adjustment

1) Remove the top cover, locus cut base 8 and exhaust slot

support&.

nut

2} Loosen vertical adjustment

8 to a proper position.

3} After the adjustment. stop locus cut base

support 8 at the position

O and move vertical adjustment

8 and exhaust slot

as

shown in the figure.

o When the position of vertical

adjustment pin 8 is changed, the vertical momentum of top feed dog changes.

o When vertical adjustment

is moved toward the top end of vertical adjustment arm, momentum is decreased and when it is moved to momentum is increased.

o When the vertical momentum is

increased, jumping occurs and noise may occur at high speed. In this case, tighten the upper

the

root,

f)

-45-

Standard Adjustment

(28) Adjusting

Adjusting

It is standard that the top

the throat plate when the top feed dog

It

is possible

the

height of the top feed dog

the

position

to

adjust the position to approximately 1.0 mm above

of

lowest point

feed

dog is 1.0 mm (safety stitch machine : 0.8 mm) from the top surface of

of

the

top

feed

is

in the lowest point of its stroke.

dog

or

below the standard adjustment.

(Reference) The standard of the height of the bottom feed dog (main and differential feed dogs)

is 0.8 mm from feed dog

the

top surface

is

in

the highest point

of

the throat plate and flush with

of

its stroke.

it

when the bottom

o

Adjusting

M0-6904R

MO-6914A

MO-6916A

MO-6943A

MO-6904J MO-6914J

M0-6916.J

top/bottom feed dogs

Model name

0~

-306

500

SOM

1.:.b.b.,.

-,Mb... M.6.

~~

-301~

6.6.D.

-SOH

b.6.6

-60H

166

-'J07

OF6

-700

CHS

-700

FH6

-700

of

various models

Top feed dog height a

1.0

0.8

1.0

1.5

0.8

1.5 1.3

1.4

1.3

of

the subclasses

Bottom feed dog height b

0.8

1.0

0.8

1.3

0.8

12

1.1

(Unit:

mm)

-46-

. I

Adjustment Procedures

Results of Improper Adjustment

r

.I

1) Loosen setscrew 8

in

the

top

feed dog and move top feed dog

8 up or down to adjust the height.

(Caution) 1. Perform the adjustment

standard top feed pressure is applied.

2.

Top

feed dog 8 is removed and personal

injuries screwdriver and securely fix setscrew 8 in

the top

may

occur. Use a

feed dog.

in

the state that the

rather

large-sized

o When top feed

higher than

Sewing materials is possible.

However, a clearance

provided bottom feed dogs, and partial shirring performance of lightweight materials or feed force

is decreased.

o

When

top

lower

than

Partial shirring performance

feed

force

dog

the

standard

of

heavy-weight

between

feed

dog

the

standard

is

increased.

Is installed

top and

is

installed

However, when overlapping

amount of top and bottom feed dogs is excessively increased, feed

dog

defect is apt

Besides, sound may become higher.

o

In

case

of

sewing

to

heavy-weight

materials

It

is

possible to sew even when

vertical stroke is increased.

Refer

momentum

to

a(27)

of the top feed

Vertical

I

is

or

occur.

dog~.

-47-

Standard Adjustment

(29) Locus cut of the top feed dog

Locus

cut

dog

actually

top

feed

By

this

can

be obtained weight is

less

The

locus

mechanism

feeds

dog

motion.

mechanism,

ones

such

for

light-weight materials.

cut

mechanism

makes

longer the

cloth

by

leveling

the

effect of prevention

when

sewing materials thicker than medium-

as

knitted

does

fabrics

not

the

or

the

work

section

lower

like

in

where

side

of

the

of

irregular stitches

although

the

state

the

of

delivery.

the

locus

effect

feed

of

Locus of

Cloth

Set

feed

the

dog

standard

(30) Adjusting

Range

of

effective feed

of

cut

amount

the

longitudinal position

to approximately

A

0.5

of

mm.

the

top

feed dog

0

Clearance between top top

feed

strokeO Clearance between feed

dog

Model name

MO

-6916R-F66

MO

-6943R

All

models of

excludilg

is

maximum,

8 travels

aforementioned

to

-50H

F.66

60H

-1

D6

-307

M0-6900R,

top

the

feed

front

and

J

models

dog 8

and

is

as

shown

dog 8 and

end

= dimension A

the groove

in

the

list

of

presser

below.

groove of presser 8

(Unit:

dimension A

0.8

1.0

0.5

-48-

mm)

8,

when

top

Top

feed

arm

c

Adjustment Procedures

Results

of

Improper Adjustment

1) Remove the top cover.

2)

Turn the handwheel to bring the top feed dog point of its stroke.

3) Loosen locus cut screw nut O and tighten locus cut screw

Then the top feed dog rises.

4)

When a proper cut amount

nut 8 so that locus cut screw 8 does not turn.

5) Loosen the setscrew in the top dog to the position where

(Caution}

1.

When the

machine

2.

When

a forced load

Use

1

mm.

is

obtained, tighten locus cut screw

feed

it

bites cloth.

using

the

machine with locus cut, use

at

a speed

the

cut

amount

Is

applied

the

machine with locus

dog and lower the top feed

of

exceeds 1

to

5,500 rpm

mm

to

the

mechanism.

cut

of

the Io·west

or

less.

or

more,

less than

9.

o

The

lifted

amount lowest point in the step 3) is the cut

amount. In this state, clearance bottom teeth large as the cut portion and feed force is decreased. Be sure to adjust the biting amount of cloth

by lowering the top feed dog in

the step 5).

between

is

increased

from

top

the

and

as

l

I

ii

!

!1

i

;I

!!

I

1) Remove the

feed arm C

2) The tightening torqueses of clamping screw O

arm C after the adjustment is

(Caution) 1.

top

cover and loosen clamping screw O in the top

to

adjust the position.

BON.

Do

not

completely loosen clamping

0 in

the

top feed

2.

If

clamping screw O in the

loosened and has moved to completely and

tighten

naturally.

arm

C.

top

the

loosen

it

it,

turn

the

at the position where

in

the top feed

screw

feed arm C is

right

or

left,

handwheel

it

comes

o When dimension A

top feed dog O comes in contact with

presser occurs. Besides, excessively improper, the top feed dog may come in contact with

frame. performing the adjustment.

the

other

components in the

Be

is

improper,

0,

and

dimension

careful

noise

is

when

!

I

-49

I

·-

I

ij

i

Standard Adjustment

(31) Adjusting

Clearance between top feed

a =

a·

(0.2

b = b' (0.2 mm)

the

mm)

lateral position

dog

8 and presser • is 0.2 mm.

_,..,._......,-

•

--

___

-,1.

______________

of

the

top

~-;;=;=;::===R==t==t=

~~~--

feed dog

l=-===~==I=

t===::i1::::t===t::b'

a

a'

b

Top

feed arm C

(Caution) 1. Adjust the position only when there ls a concrete problem that presser 8 and

feed dog 8 come

clearances are excessively different from each other and trouble occurs, etc.

2. When the adjustment value ls improper, there the components occurs, a bad influence Is given to the durability machine

of

or

the

space. So, be careful.

in

contact

the like since the

with

each

other

and noise occurs, the

is

the possibility that contact among

top

feed mechanism is strictly assembled because

left

of

the sewing

and

top

right

-50

-

Adjustment Procedures

Ii

Results of Improper Adjustment

1)

Loosen the setscrew in the feed bar guide B. Refer to "(33) Adjusting the feed bar guides A and

2) Remove the top cover and loosen setscrew O

arm

C. Refer to (30) Adjusting the longitudinal position of the top feed dog.

3) Loosen the setscrews in thrust collars 8 located

sides of the horizontal shaft and move the set of horizontal shaft, top feed position in the thrust direction (direction you desire to adjust the position). Then fix two thrust collars

(Reference) When loosening the setscrews in thrust collars

8,

do not simultaneously loosen the two setscrews. First,

loosen thrust collar 8 on the side fix

it

at the predetermined position. In the state

it

in the direction, check that contact at the lateral position

or at the top feed mechanism does not occur. After the checking, move and aforementioned procedure can perform good adjustment.

4)

Tighten

aforementioned order and perform the adjustment.

the

respective

bar

and top feed dog to

.fix

the remaining thrust collar

setscrews

the

Oat

of

moving direction and

by

B".

in

the top feed

on

the both

predetermined

the position.

of

pressing

e.

The

reversing

the

o

Excessive directions of cloth base side and

handwheel side produces

contact of top feed bar with the

respective sections of top feed mechanism.

(Fully

torque, engagement, the time of adjustment.)

check

move

the

in

change

or

noise at

both

the

of

I

ll

j

I

~

'I

~

I

~

11

r

-51

-

Standard Adjustment

(32) Position of the motion

Adjusting the position of

Loosen

the

o Intermediate constant (standard)

the setscrew in horizontal ann A O

position of the motion

the

of

motion

the

o Intermediate constant

When the pitch

of

the

top

o Rear constant

When

the pitch of

position of the

o Front constant

When

the

pitch

position of the top feed

top

of

the

feed

the

top

feed

dog

feed

dog

of

the top feed dog

of

the

top

and

top

feed dog.

o Rear constant

feed

dog

is

increased,

dog

is increased, locus extends

is

constant.

dog

is

increased, locus extends

is

constant.

feed

move

dog

the

position

the

top feed dog extends

to

of

horizontal

o Front

the front while the

the

rear while

arm

constant

to

the front

the

A O

to

change

and

rear.

most

retarded

most advanced

i

I!

Position of the motion

of the

top

feed dog

changes

the installing angle of arm

by

changing

f!f

horizontal

A 8 and horizontal

armB9.

--52

Horizontal should

-

not

feed

~

sway

link 8

to

the

right or left.

Adjustment Procedures

Results

of

Improper Adjustment

o Intermediate constant

1) Make horizontal arm

turn

the handwheel

where it is desired to

2)

At the position, tighten horizontal the

top feed dog does not move even when the top

is

moved.

3) Loosen horizontal arm C 8 at the position where the top feed

dog

does not come of the presser even when the pitch of the top feed dog is maximized. Then adjust the position of the horizontal shaft.

AO

in

the state of temporary tightening,

and

adjust the top feed dog

be

constant.

arm

in

contact with

the

to

the position

A 8 at the position where

feed

lever

front or

rear

of

the

groove

o Rear constant

1) Make horizontal arm A O

turn the handwheel and adjust the top feed dog to the most retarded position.

2) At the position, tighten horizontal

the top feed

is

moved.

3) Loosen horizontal arm C O

dog does not of the presser even when the pitch of the top feed dog is maximized. Then adjust the position of the horizontal shaft.

dog

does not move even when the top

come

o Front constant

1)

Make horizontal arm A O turn the handwheel and adjust the top feed dog to the most advanced position.

2)

At

the position, tighten horizontal arm A O at the position where

the top feed is

moved.

3)

Loosen horizontal dog

does not come of the presser even when the pitch maximized. Then adjust the position of the horizontal shaft.

(Caution)

dog

does not move even when the top

arm

1.

Never loosen

keeps the .thrust

2.

Set horizontal ann CO

horizontal feed link 8 lightly moves without

play.

3.

Provide a clearance of 0.5 between

the presser when the

in

the state of temporary tightening,

arm

A O

at

the position where

feed

at

the position where the top feed

in

contact with the front or rear of the groove

in

the state of temporary tightening,

feed

C 8 at the position where the

in

contact

the

with

the front or rear

of

the top feed dog is

horizontal

of

the horizontal drive shaft.

top

feed

arm

to

the position where

dog

and

pitch

is

top

of

the

groove

B8

since

mm

or more

the groove

maximized.

lever

feed

of

o At the time of rear constant, the

lowest point of the is

apt

to

be

lowered increasing the top feed stroke (clearance between top feed and

bottom increased) for partial shirring. Use the top feed dog with constant or front constant.

and

feed

there

o When the top feed dog is set to

front constant, biting of cloth at the start of sewing However, a few loading is apt to ~cur

at the overlapped section

of

knit tab ric

it

o If the play between horizontal

arm

C 8

and

horizontal feed link

0

is

large, the return of the top

feed

adjusting lever and a forcible load the components.

top

feed dog

when

dogs

is

no

effect

Intermediate

Is

improved.

is

worsened

is

applied to

/

11

l

f

1·

11

I·.

I

-53-

I

Standard Adjustment

(32) Position of the motion of the top feed dog

1.

The

position

intermediate constant for other models at the time of delivery so that the best locus suitable to the purpose of use can

2.

Intermediate constant position at the time of delivery

The

position to the position where the top feed dog does not move even when the top feed lever is moved at the position where the timing is advanced

of

motion is adjusted to rear constant for 50H and 60H series and MO-6900J, and

be

obtained.

of

motion of the top feed dog other than that of 50H, 60H and MO-6900J is adjusted

by

19· from the upper dead point

Upper

dead

point

of

needle.

of needle

to

11

,j

I

I'

(33) Adjusting the feed bar guides A and B

I

~

11

·1

I

11

~

11

I

lj

I!

I

When the play removed by adjusting the feed bar guides A and

of

the

top

feed dog in the lateral direction is excessively increased, the play can be

Hole on this side

Oil

Upper

ofneedle

B.

pan

dead

side

point

II

1,

I

i

I

1!

-54

-

Adjustment

Procedures

Results

of

Improper

Adjustment

o Standard of the position where timing is advanced

the upper dead point of the needle

1) Timing is advanced by approximately point of the needle at the position where the hole in the periphery

of the handwheen faces just under.

21

• from the upper dead

by

19·from

1)

Remove top cover, locus cut base, exhaust slot support, and adjusting arm spring.

2) Loosen top presser adjusting screw screw nut in the lateral direction of top feed dog

3)

Remove the needle thread tank, loosen setscrew O in the feed bar guide B and temporarily tighten feed bar guide B 8 so that top feed bar 8 is put between feed bar guides B 8 and A C,.

4) Move top feed dog 8 up or down and adjust so that top feed

dog 8 comes down by its weight and that the play in the lateral direction of top feed dog 8 is kept down to a minimum.

5)

When does not come down by its weight even after adjusting feed bar guide B 81 loosen setscrew 8 in the feed bar guide A and adjust feed bar guide A the lateral position of top feed bar C, feed dog O drops naturally when moving it up

C,,

release top presser pressure, and check the play

jar

is produced at top feed dog • and the top feed dog

C,

at the same time. At this time, adjust

0,

top presser adjusting

8.

to

the position where top

or

down several

times.

6)

Securely tighten the respective setscrews and check that there is

neither play

7) Return adjusting base and top cover to their home places. Refer

to

(Caution)

When

and top feed barC,, jumping Adjust down

by

nor

jar.

arm

spring, exhaust slot support, locus cut

"(27) Vertical stroke of the top feed dog".

jar

occurs

between

the

top

feed

dog

its

weight as mentioned above.

feed

of

top feed dog 8

to

such

an

bar

guide

extent

will

A 8

and

be caused.

that

It

B

8,

comes

o

When

the

play

in

the direction occurs, the top feed dog comes in contact with the presser and noise occurs is apt to be put

o

On

occurs between fedd bar guides

A

Cl

0,

phenomenon of top feed dog will be caused.

of

top

feed

dog

or

feed dog defect

on

cloth.

the contrary, when torque

and B

8,

and top feed bar

inducement of the jumping

lateral

0

f)

-55

-

Standard

Adjustment

(34) Adjusting

1.

Standard

tightened, sound becomes quiet and lower pressure. Besides, when using the top amount of the

2.

Dimensions listed

vertical amount of top

Accordingly, when using the machine decreasing the sewing speed, use it with rather large value (top feed dog pressure dimensions A

the

top feed dog pressure

<Standard height

Dimension A

MO-6900R

MO-6900J

is

the position where the top feed dog stops jumping and,

is

feed

dog

making low the top

top

feed dog or decrease the sewing speed.

in

the list are slightly increased values that

feed

dog and sewing speed are

in

the list.

24to25mm

20.5

to

21.5mm

20.5

to

21.5mm

stabilized when gradually tightening the screw

feed

dog

can

in

the most strict combination

by

decreasing the vertical amount of the top feed dog or

of

top presser adjusting screw>

Vertical

amount

top

feed

Less

than

6.Sto8.5mm

8.5mm

when

pressure, decrease the vertical

be guaranteed

of

Max.

dog

6.5mm

sewing 7,000rpm 7,000rpm

6,000rpm

further the screw

even

in

is

from

when

the list.

low)

speed

is

the

than

(35) Lifting amount

The height

the lowest point of

of

the top feed

of

the top feed dog (when operating the pedal)

dog

the

needle bar and

from the

top

the

surface

top

feed

of

the

dog goes

In

case

throat plate when

up

to

the highest point is 9 ± 0.5

of MO-6900J, the height

the

pedal is depressed at

is

10.5 ±

0.5

mm.

-56

-

Adjustment Procedures

'I

I

Results of Improper Adjustment

Loosen top presser adjusting screw nut

presser adjusting screw

and feed force top presser adjusting screw nut

(Caution) When the top feed dog jumps and noise becomes

large during using the sewing machine, tighten top presser adjusting screw 8 until noise becomes small. When the

machine

large, a forcible load is applied to other section. careful.

is

is used for many hours while noise is excessively

8.

the top feed dog pressure is increased

increased. After the adjustment, be sure to tighten

8.

0.

when tightening top

So,

be

o When top feed dog pressure is

excessively low

Top

feed

dog

jumps

and

noise becomes large. Feed force is decreased.

o When top feed dog pressure is

excessively high Feed dog defect is put on some

materials. Unnecessary load is applied to

the

sewing

the worse by it. Noise level is increased.

machine

machine is influenced for

and

the

I

II

11

1)

Loosen lifter B stopper nut O and

to adjust the lifting amount.

2)

After the adjustment, tighten lifter B stopper nut O.

Play

between the top end

presser lifting

feed

dog is brought to the lowest point (needle bar is at highest point). (Top end arm 8 by 0.5

arm

8 should

of

the screw should be separated from presser lifting

to

1 mm when pulling the lifter B with finger.)

turn

litter 8 stopper screw 8

of

lifter B stopper screw 8 and

be

0.5 to 1 mm when

the

top

o When the lifting

top feed dog is excessively

contact occurs between vertical

shaft

and occurs sewing machine.

when

lifter

amount

B,

and

operating

of the

high,

noise

the

o When the lifting amount of the

top feed dog is excessively low, when entering cloth of

sewing

materials, cloth

to

be

entered

dog.

at

the start

heavy-weight

may

be

not able

at

the

top

feed

11

I

II

11

Ii

I

- 57

--

Standard Adjustment

(36) Height of

Height of the presser from

the

presser

the

top surface

(pedal

operation)

of

the

throat

MO

MO -6914R

MO -6916R

MO -6943R MO -6914R MO -6914R

Whole

plate

-6904R

when

the presser goes

Model

-0.6.4

0.6.6 064

-8.6.4 -307

8.6.6

-

-064

0.66

FF6 -300

F.6.6

-106 -307

-866

-.6..6..6.-4.6.H

M0-6900J

-300

-500

-307

-300

-SOH

-60H

-337

uo

to the

highest

Height

of

presser A (Max.)

5.5±0.2

5±02

5±0.2

(Unit:

7_~

6.5_~

7_~

6.5_~

8_~

point

mm)

·-

Level

(Caution) When height A of the presser is adjusted

connection with it,

changed. Check the

presser referring

the

adjustment value

the

lifting amount

to

"(35) Lifting amount

of

the

of

top

pedal)"

-58-

•

at

the time of operating the pedal, in

the

lifting amount of the top feed dog is

feed

dog

after adjusting the height

of

the

top

feed dog (when operating the

of

Adjustment Procedures

1}

In

the state that the presser pressure is applied, loosen presser

tu

ming lock nut O and adjust the height with presser lifter turning

setscrew 8

operating the presser lifting pedal. At

this time, check that there

upper looper, needle clamp, top feed dog, etc.

(Caution) Adjust

between pedal

is

with

presser lifter turning setscrew 8

so

that the height in the list is obtained when

the

height

presser arm O

pressed

and

so

and

presser

is

no contact of the presser with

that

there

is

a slight clearance

presser

lifting

arm

stopper 8 when

arm O comes

and

stops.

in

contact

Results of Improper Adjustment

o When the height of the presser

is excessively low, entering taking hard.

o When the height of the presser

is excessively high, there is the possibility comes in looper, needle clamp, etc.

out of

that

contact

cloth

the

becomes

with

or

presser

upper

o Adjust the height

thrust arm 8

1) Removing the thrust play of the presser shaft, temporarily tighten thrust arm clamping screw Lower the presser by 1 presser arm

2} Next,

3)

in

the state of the aforementioned 1 ), fix presser lifter

arm

t)

with thrust arm clamping screw 8 so that presser lifter

arm

t)

Is

level and there is no clearance at section A.

Adjust

aforementioned lifter B stopper screw 8 and nut the height of the presser with presser lifter turning setscrew 8 and nut

the

C,

by

the procedure below even when presser

is

removed.

to

O.

lifting

amount

so that the height

8.

3 mm from the throat plate with

of

the top

in

the list is obtained.

feed

dog

0.

and adjust

with the

I

,I

,.:111

!I

I

-

59

-

Standard Adjustment

(37) Lifting amount

It is the standard that the height from the top surface of the throat plate is 9 ± 0.5 mm when presser

lifting lev highest point. MO-6900J : 10.5 ± 0.5

er

0 is pressed at the lowest point

of

the top feed dog (when

mm

the

presser lifting lever is operated)

of

the needle bar and top feed dog O goes up to the

-

60

-

Adjustment Procedures

Results of Improper Adjustment

1) Remove cloth base side cover

2)

Bring the needle bar to the lowest point of its stroke and keep

top feed dog 8 at the height of 9 ± 0.5 mm (M0-6900J : 10.5 ±

0.5 mm) from the top surface of the throat plate.

(Insert

the

s~cer

between the throat plate and top feed dog

3)

Loosen clamping screw 8 of lifter A

4) Press presser lifting lever O until

it.

In

this state, turn lifter A O and strike the pin section to the

eaves section of top feed square block C,. Then tighten clamping screw 8 of lifter A

(Caution) In the state that presser lifting lever

check that

ther_e

is a clearance between the pin

8 and the eaves section of top feed square block

5)

Return top feed cover G and cloth base side cover 8 to their home positions.

f)

and top feed cover

8.

it

will go no further and tum

0.

8.

f)

is returned,

of

0.

0.)

lifter A

o When the lifting amount of top

feed dog O contact of top feed square block

is

excessively high,

8 with the pin section of liter A 0

occurs operation wrong with the machine.

o When the lifting amount of top

feed dog 8 is excessively low, cloth

or hard to be removed at the thick section section

at

the

time

and

something

the presser becomes

such

as

overlapped

or

the like.

of

is

I

ii

'I

'1

I

I I

I

!

i

I

!

I

.I

I

1!

I

-

61

-

I I

i

I

i

I

(38)

Position

M0-6A04S

thread

guide

The

thread

hole

the

In

portion

the

position

noodle

~

and the hooked take-up are hole

in

-~--

of

the

(R)

Needle thread

B take-up

the

needle thread

of the needle thread

where

thread

guide

thread

guide

2/3

of

the

can

be

Standard

guides

Needle thread guide

of

The thread holo

and take--up are In

and

Needlo thread take-up 2·need1e machine

z..,,eedle machine

the

hooked

=~~·

Adjustment

the looper thread take-ups

M0-6M4S(R)

In

the

needle thread

portion

of

the

position

nees:ead:lde

~

lever

of

the needle thread

where 2/3

guide of

the

can

be

M0-6616S

Needlo thread take-

up

guide

hooked

are

In

the

of

hole

in

the

needle

of

the

position

chalnstitch

The thread

and

the take·up hole

om=~

The thread hole In the double-chalnstltch needle thread

portion in the needle thread

(R}

e

Needle

double·

machine

portion

)

machine

in

the

needle thread guide

ol

the

position

thread

guide

and

needle thread

where

the

guide

can be

needle thread

where 2/3

guide

the

tak~up

entire

observed.

thread

of

tho

can

hooked

are

hole

be

In

(Caution) The needle thread take-up shall be positioned at the lower dead point.

Symbol

A

D C D

E

F

G

H

I

J

K

L

M N

0

p

Upper looper thread

guide {middle)

F

H

Looper

thread

take-up (left)

MO-6.::,04S

General

thread

15.8

3.4

(R}

(Standard)

woolly

thread

-

22

65

17.5

43.5

26.5

38

15

6.5

29

27 11

-

•-

-

41

-

21

...

.

J

M0-6.:..14S

(Standard)

General

thread thread

-

.

-

- -

-

38

12 15 10

-

23

-

. .

Upper looper

(R)

Woolly

-

.

-

throad

Upper

I

MO-6.:.165

(Standard)

General

thread

·-

1.8

21.5

30.5

-

- -

-

34

12

6.5

27.5

20

-

16

guide (upper)

looper thread guldo (right}

Lower

thread guide

Lower

looper

thread take.up

-

M0-6..::.16S (R)

(50H,

OOH)

General

thread

-

2.6

2.3

24.5

(R)

Woolly

thread

- -

-

36

15 12

-

- -

--

-

·-

-

34

~-

19

-

12.B

looper

General

thread

40.5

M~,:05S(R)

(Hemming)

Woolly thread

-

3.4

-

--

24

38

12 24 29 24

12

-

42

-

34

-

(Unit:

mm)

M0-6~045

General

-

(Soft

(R}

chain)

thread

13.5

2.1

-

--

-

43.5

26.5

43.5

14

-

26.5

19

9.5

-

-62-

Adjustment Proc~dures

Results of Improper Adjustment

I I

1) Perform the adjustment by the setscrews. Position of the needle

thread guide O and needle thread take important decisive factor· when making soft chains since the needle thread take-up amount is increased in this case. So,

carefully position these parts.

Large

0

2)

Set distance I a little smaller when using synthetic thread which tends to form stitches swelling

out of the cloth edge. A smaller I is effective for preventing stitcli skipping.

3) Distance J

and lower looper threads.

Set this distance larger for wooly thread, and set it smaller for thin thread which is likely to cause stitch skipping.

4)

It is desirable to set distance K l~rger for stretchy threads such as wooly thread.

5) Set distance L a little larger when making blind hemming soft

chain stitches.

6) Set distance N a little smaller for blind hemming chain stitches.

7) Set distance O larger if stitch skipping occurs due to looper thread slack. Set stitches when wooly thread

·is

it

smaller for better appearance and touch of produced

Lower

looper

Upper

~Small

---~

or

the like

related to the vertical knotting point of the upper

Is

used.

Needl~hread

looper

@

up

8 lever is a very

take-up

Upper

amount

I

or

looper

slack

Swell

making soft

out

o Distance@

When

tightness stitches will be obtained.

When set larger, loose needle thread stitches

o Distance

influence on stitch formation,

however, these contact parts.

o DistanceJ

When set larger, the amount of the upper looper thread will be increased. When set smaller, the amount of the upper looper thread will be decreased.

o Distance K

When set larger, the amount of the upper looper thread will be increased.

When set smaller, the amount

of the upper looper thread will be decreased.

o

Distancel When set larger, the amount the upper looper thread will be increased. When set smaller, the amount of the upper looper thread will be decreased.

o Distance N

When set larger, the amount of the upper looper threa~ will be increased. When set smaller, the amount of the upper looper thread will be decreased. ·

o Distance I

When set larger, the amount of the threads will be increased. When set smaller, the amount of threads

o DistanceO

When set larger. the amount of the threads will be decreased. When set smaller, the amount

of the upper and lower looper

threads

set

smaller,

of

needle

will

E,

F and H exert least

improper

distances

between

upper

and

the upper and lower looper

will

be decreased.

upper

and

will

be increased.

result.

setting

will

the

lower

better

thread

cause

moving

looper

I

of

-63-

ll

1,

Standard Adjustment

(39) Adjusting soft chain making mechanism

1) Replacing the parts

8 Needle thread presser

with

those exclusively designed for making soft chains

p1ate

C ....... 12112504

8 Driving cam .................................... 12112603

8 Needle thread presser spring B .•... 12112702

· 8 Throat plate .................................... {only

0D4·3O0 ......................................... R4200J6OO0A

2)

Adjustment value

CD

Needle thread guide and needle thread take-up lever

Adjust

the

needle thread guide

is

In

the lowest dead point

3,l

fo35/

to

increase the

of

its stroke.

Needle thread takeup amount when the

needle

bar

lowest dead point

·

mrn

for

1-needle

overlock machine)

needle

is

in its

thread

feeding

2.5

f)

amount

f03,n,n

when

the

needle

Needle thread take-

up

amount

needle

/ lowest

bar

dead

when

is

in

point

bar

the

its

I

ii

1·

.I

(04 1-needle overlock machine)

® Adjust the rising amount

Adjust the rising amount driving cam 8 to the right and left

Rising amount : 0.6 to 1 mm {max.)

of

needle thread presser plate

of

needle thread presser plate C 8

•

within

the slot.

-64-

(16 Safely stitch machine)

C.

to

0.6 to 1 mm {max.)

by

moving

~

3)

Important points in adjustment

CD

Increase the thread take-up amount of the needle thread take-up lever. Refer to

the

adjustment values related to the needle thread guide and needle thread take-up lever.

® Reduce the feed of the looper threads. (Mainly lower looper thread)

Set J,

K,

Land

M for

the

soft chain distances.

Fine adjustment of J and M is required to produce even stitches.

(3)

Adjsut the thread tension while checking the appearance

1)

Minimize the needle thread tension

as

far

as

satisfactory tightness of needle thread stitches

obtained.

2) Increase the upper looper thread tension

as

much as possible.

following.

1) Increase the upper looper thread tension.

2)

Further increase distances J

3) Further increase the upper looper thread tension.

4)

Increase the lower looper thread tension to a maximum

thread stitches is maintained.

5) Increase the thread take-up amount. If the needle thread

thread tension.

@ Fine adjustment for producing stitches with better appearance

1) If the knotting point varies at high or low sewing speed, slightly reduce

lower looper thread tension.

2) If a

knot

is

made

at

a high point, increase J and

3) If the needle thread

is

thread tension.

®

Pay

attention

1) Minimize the needle thread tension as far as satisfactory tightness of needle thread stitches is

to

the following

obtained.

2) The knot of upper

3) Minimize

4) For a safety stitch machine, adjust the soft chain making mechanism

thread

Upper

looper

thread

guide (middle)

the

is

produced during double-chain stitching and overlocking.

and

lower looper thread tension as far

Upper looper

G K

17

5

and

K.

I.

likely to break, decrease the thread take-up amount

lower looper threads should be made near the upper edge of a material.

as

even stitches are maintained.

thread

guide

(upper)

14 Upper looper thread guide (right)

and

touch of the stitches produced.

if

it

is

not satisfied, proceed with the

as

far as good tightness

is

poorly tensed, increase the needle

and

touch

L,

and increase the

and

lower the needle

so

that uniform chain-off

of

needle

is

Soft chain stitches

Standard stitches

~

Lower

When the chain-off

thread is pulled.

When the chain-off

thread

is

pulled.

Lower looper

thread

looper thread

c:::>

-65-

guide

The value given

is

the

safety stitch machine. (Unit : mm)

tako-up

~saess:

~lftf'li"trw'll"'I

OiO\tmll!U~rna:

Looper

loosened and stretch well

//

:ti

in

( ) parentheses

adjustment

The looper thread loosens

value

for

the

thread should not be

Standard

Adjustment

(40) Position

of

the

M0-6904G (J)

The thread hole

guide and the hooked portion

needle position where 1/2 to

in

the needle thread guide cannot be

observed.

thread

in

the needle thread

take-up

the

thread guides and the looper thread take-ups

of

the

are

in

the

entire hole

M0-6914G (J)

Needle thread take-up 2-needle machine

Needle thread

guide

of

2-needle machine

The

thread

guide

portion

of

up are In the

the

entire hole in

guide"~

of

hole

in

the

and

the needle thread take-

position

the

needle

the

hooked

where 1/2

needle thread

The

thread portion

up

to

the entire hole In the needle thread guide

M0-691

Needle

thread

chainstitch machine

thread

hole

guide

of

the

are

in

the position where

cannot

be observed.

SG

take-up

in

and

needle

of

MO-6900G(J}

(J)

of

double·

the

needle

the

hooked

thread

take-

1./2

to

(Caution)

M0-6903G

'1-sia""

The

needle

14,8mm

Needle thread take-up

thread

M0-6905G

take-up shall

be

positioned

Needle

thread

take-up

st\

at

the

~

lower

dead

point.

-66-

MO-6904G (J), 6914G (J), 6916G (J)

M0-6903G

(Caution) The

and the looper thread take-up (left) shall

be positioned of

u_pper

the

MO-6905G

looper thread-take.up (right)

at

the extreme right

upper

looper.

point

lll

Ii

'I

i

l

I

·,l

I

i

11

Ii

I

'-I'

C

Position M0-6904G(J)-OF6-700 MQ-6914G(J)·CH6-700

A

B

C

D

E

F

G

H

I

J

K 17

70

22

48 18

43

22

11 27

23

18

....

...

-

...

-

,._

-

M0-6916G(J)-F

-

~6-

700

M0-6905G-OM6-7

65

20

46

-

22

18 16

26

20

10

-

~O

(Unit:

mm)

M0-6903G-ON6-3D1

-

52

-

13 31

-

27

-67-

4.

ADDITIONAL

(1) Thread tension

INFORMATION

AND

PRECAUTIONS

1) Strength of tension

Pan

No.

11550100 11550209 13137807

13138508

13138805

B3121804000

Color

Purple

Green

Yellow

2) Springs used

Mo M0-6604S(R) series

MO-6P..05S MO-M

MO·M MO-6616S(R)-6L":.~·66.6.(4~6 or MO-6.6.16S(R)-6fa'\-506 MO-6D. MO-6643S(R) series M0-66455

MO-6903G-ON6-3D 1 Blue MO-6904G(J)·0F6M0-6905G-0M6-7

MO-6914G(J)-CH6· 700 MO-6916G(J)·FM-700

series

12S

series

14S(R) series

16S(R)-6D.ll.-60H Green

series

60

spring

Natural length Operating

(mm)

19.5mm

19.5

mm

Red

Blue

Gray

for

700

19.5mm

17.8mm

17.3mm

13.8mm

each model.

lower)

length

11.5

11.5mm

11.5

9.8mm

9.3mm

5.8mm

e

Needle

Red

Yellow Red Red

Red

Purple Yellow

Purple Green

(mm)

mm

thread

Yellow

Yellow Red Red

Red

-

Red

Weight required spring to working length

8.92±0.49N (910 ± 50

6.27±0.49N (640 ± 50 g)

4.21±0.49N (430 ± 50

3.14±0.34N (320 ±

1.4 7±0.20N ( 150

1.47:t0.20N (150 ± 20

Double-chainstitch

needle·

thread

to

compress

:t

Upper

-

Yellow

Red

Green Blue

Yellow

Red

-

Yellow

g}

g)

35

g)

20 g)

g)

looper Lower looper

thread Yellow

Blue

Yellow Blue

Blue

Yellow Blue

Blue

thread

Yellow

Yellow Yellow Yellow

-

Yellow Yellow Yellow

Yellow

Purple

Blue

-

Blue Red

Red Red

(2) Upper looper

Use a proper upper looper in accordance with the needle No. When ordering, refer to the Parts List. The

numbers shown in D frame in the table below are engraved markers.

parentheses are the kinds of the needles. Parts Nos. with

Model

6604S(R)

6D.16S(R)

6~

14S(R) series ·1211

6903G-ON6·3D1 6904G(J)·OF6-700 6905G-OM6-7 6914G(J).CH66916G(J)·F66-700

an

asterisk• are factory·installed on the standard machine heads at the time of delivery.

Needle

{kind)

#11

No.

#14

Nos.engraved

series

series 1199

·11aa

1217

upper looper

[1Cl

C!L]

OD

on

#9

#14 #16 #18 #21

O[J

#16 (00x5) #21

(0Ox5)

#24

(DCx1)

#18 (OOxS)

#21

(00x5)

-68

-

60

700

!1201481

!123835!

i

123837! !123836! !123835!

In

addition, the letters in ( )

(3) Center-to-center distance of the upper looper holder

The center-to-center distance of upper looper holder O.

MO-_ 6604S(R)

MOSS

MO-

6604S(R)

MO-

•

(Caution) * (asterisk) marks are exclusive for

to the MO-6900G(J). They are not

common

to

the MO-6000S(R)

series.

6612S

MO· 6612S

rvD-

6~14S(A)

MO-

6616S(R)

MO·

6616S{R)-

MO- 6943R

MO-

6M3S

MO-

6903G -ON6

MO-

6904G(J) -OF6

MO-

6905G

MO-

6914G(J) -CH6

MO-

6916G

Model

-t::.6.b

-Ab.6

-004

·OMS

(J)

OF6

-CE4

-D66

-~

~

BE4

0D6

-Mb.

-~

FH6

-

FF6

to

-666.

-A~O

OE4

-D.66

-61:..6

FFt::.-

-

4ti.H

.

50H

-40H

-1.:..li.O

4

61-1

561-l

-6D.7

-40H

-3D1

-700 700 7E0

-700

(Unit:

Center-to-center

distance

38

39

38 39

39

38

39

39 39

•39

37.5

•39

37.5

mm)

C)

( 4) Caution in assembly

1) Application of sealant

G) Setscrew of the throat plate base (B) retainer 8 (JUKI seal)

Apply the sealant only to

® Bottom surface

Apply the sealant to the bottom frame surface.

of

@ After assembling the front edge of the

sealant to the gap of the contact surface between the frame and the upper looper guide support O

(

Offlffl

section in the illustration).

Be

careful

sealant

Apply

the

right setscrew.

the upper looper guide support 8 (Three-bond 1104)

not

to

allow the

to

run

to

the

rear.

the

sealant

bottom surface.

to

surface

of

the upper looper guide support

upper

looper guide support e (Three-bond 1212), apply the

~1~~e

'y~

•7

c,_(~

8,

Apply

the

bottom surface.

Apply

only

to

_,

the right

setscrew

which contacts with the

sealant

to

the

-69-

©

®

Portion

Apply

(4

Oil

Apply

of

the

sealant to

pcs.)

shield plate assembly

the

sealant to

Vh"

//4'-"""~~-'L..ol::..L-<:'-441~...:.;._-

the

setscrews

the

of

the

oil

shield

(JUKI

inside of

dust-proof

case

setscrew O

seal)

the

oil shield plate

Apply

the

hatched parts.

rubber

the

sealant to

case

{1

8.

{JUKI

pc.)

and

seal)

the

dust-proof rubber case 8 setscrews

.::·.:

® Portion

Apply

the

top

Apply

Apply the sealant

plate and the

Be

careful

of

the sealant to

oil shield rubber support plate , surface of

the

sealant

top surface

that

the sealant should not overflow on

the

feed

mechanism cover (Three-bond 1212)

the

feed bar presser.

to

the

of

the oil

shield plate.

to

the

oil

top

surface

the side

of

Inside contact surface

the

rear face of the

the

top

shield rubber support

of

the oil shield case.

the oil shield

rubber.

feed

mechanism cover, the

surface of

the

Feed

cover (rear

top

oil shield case,

mechanism

face)

Ughtly face

of

and the top surface presser.

surface

apply the sealant

the feed mechanism cover

and

the hatched

0 0

of

the oil

of

shield parts

on

0 O

to

the rear

the feed bar

plate,

the

-70-

(J)

Various sealants

Maker's

Three Bond Three Bond Three Bond

JUKI exclusive part Nos. of the above 3 kinds of the sealants are not set.

2) Precautions

Feed

bar

o

Be

careful of the orientation of the oil shield rubber 8 and the dust-proof rubber 8 .

name

to

be

taken with respect to the lubricating components

components

•

Part

No.

11040 *

1104

1212

*:

It is commonly called "JUKI

X X

sear.

X

g

D

* Assembling

result in oil leakage. So, be careful.

o Assemble the feed bar presser 0 and the dust-proof rubber case @ so that their top faces are flush

with the frame plane on which the feed mechanism cover is installed.

o

Do

not loosen the screws in feed bar presser 8 unless it is necessary. The clearance between the feed

bar presser and the feed bar and the contact with each other are important.

n

as

shown

1T

in

the

illustration will

-71

Do not loosen the screws.

I

i

-

JI

!I

1,1!

,j

(5)

1)

Motor

Kinds

of

pulleys

MO-6.600S(R)

Sewing

speed

of

sewing machine

(rpm)

8500

8000 150 (145) 7500 7000

6500 120 (115)

6000 5500

5000

4500

4000

MO-6900G(J)

Sewing speed sewing machine

(rpm}

6000

5500 5000

4500 4000

•

Use Use

motor pulleys,

and

belts

Outside

d'iameter

ol

motor pulley

mm

(Etreclive

diameter

mm)

160

(155)

140

(135)

130

(125)

110 (105) 914 (36)

100

(95)

90

(85)

85(80) '889

75

(70)

of

Outside

diameter

of

motor pulley of motor pulley

mm

(Effective

diameter

mm)

125

(120)

115 (110)

105 (100)

95

(90) 914 (36)

85

(80)

a motor of 3/4 a motor of 1/2

belts

and

frame

50Hz

V-belt

Semi-sunken

type

mm

1016

1016 (40)

965(38)

965 (38)

965(38)

914 (36)

889(35) 762(30)

864(34)

50

Semi-sunken Fully-sunken type

mm

965

940 914

889 (35)

HP

(550

HP

(400 W) when the sewing machine runs

Fully-sunken

{inch)

type

nm

(inch)

(40)

(35}

Hz

(inch)

(38) 864 (34)

(37) (36)

W)

914(36)

864

(34) 125 (120)

864 (34) 120

864(34} 813 (32) 100 813{32)

813

(32)

762(30) 70 762 (30) 60 (55)

V-belt

type

mm

(inch)

838(33)

838 '33}

813(32)

787

(31)

when the sewing machine runs at 7,000 rpm

support

Outside

diameter

of motor pulley

mm

(Effective

diamctermm)

135

(130)

(115)

110 (105)

(95)

95(90)

85 (80)

BO

(75)

(65)

Outside diameter

mm

(Effective

diameter

mm)

105

(100)

95 {90}

85(80)

80(75)

70(65)

plate

bolts

60Hz

V-belt

Semi-sunken Fully-sunken

type

mm

(inch)

type

mm

(inch)

965(38)

965

(38}

965(38) 813 t32}

914

(36}

914

(36)

889(35)

889 (35) 762

864(34)

60

Hz

Semi-sunken Fully-sunken

type

mm

(inch)

914(36)

889(35)

889

(35) 787

at

a speed lower than 7,000 rpm.

V-belt

type

864

(34)

813

(32)

813(32)

813 (32)

762

(30)

762 {30)

762(30)

~(29)

mm

838

(33)

813(321

787(31)

787

(31)

or

higher speed.

(inch)

(Caution) If a

motor

of

less

than

400W

is

used,

and the sewing speed may not increase

cases.

• Part No.

* Part No.

of

motor pulley

MTKPOxxxOOO

If

the outside diameter of the motor pulley is 150 mm,

(Enter the effective diameter to

..... So, the part No. will be MTKP0145000.

If

the

outside diameter of the motor pulley is 90 mm, the effective pulley will

. ... . So,

the

part No. will be MTKP0085000.

of

belt

MT

JVMOOxxOO

If the belt length is 1 O 16

..... So,

the If the belt length

..... So,

the

(Enter a number that shows the belt length to

mm

( 40 inches), enter "40"

part No. will be MTJVM004000.

is

889 mm (35 inches). enter "35" to

part No. will be

MT

JVM003500.

in

the

low tenperature

or

the sewing machine

"xxx.")

the

to

"xx."

effective pulley

"xx,")

"xx."

area,

viscosity

may

will

be

085 .

fail

145

of

to

.

oil

increases

run

in

some

-72-

2)

Pat

No. of

frame

support plate bolt

CD

Semi-sunken type Support plate bolt (A) Locknut

Washer

Spring washer

CID

Fully-sunken type Support plate bolt (C) Support plate bolt (D) 13155205 x2 Locknut NS6240630SE Washer Spring washer

13155007 NS6240630SE WP1002036SE WS1002560KR

13155106

WP1002036SE WS1002560KR

x4 x4 x4

X4

x2

x12

x4

ii'

·1

II

11

':

I

!1

I

Difference of support plate bolts Entire length under the neck and length of threaded part

Support plate bolt (A) Support plate Support plate bolt (D)

Support plate

E E

en

co

bolt

(C)

(A)

(A),

(C) and (D)

Entire length Length

69

..

137 149 119

Support plate bolt (C)

E

......

E

C')

E

,....

-

C

-

(6) Inspection and replacement of the cartridge filter

1. When the sewing machine is used for many hours, cartridge filter

0

may

be

clogged with dust.

When

this state continues, oil is not fed through cartridge filter O

and abnormal worn-out

caused.

• Normally, and

2. Inspecting/replacing procedure

1)

First, remove drain

2)

Remove setscrews 8

above.

(Caution)

the oil amount indicating

3)

Remove clogged with dust, clean

4) Insert cartridge filter O

setscrews

" Part No.

be

sure

clean

or

replace it.

screw&.

When

upper cover 9

and

inspect

8.

of

cartridge filter : 11843208

(Unit:

mm)

of

threaded part

39

·-

107

Support plate

E

en

E

~

E

-

en

T'"

-

or

seizure of the sewing machine will be

to

check cartridge filter O every 6 months,

and

remove upper

is

moved

rod

or

the fitter

cartridge

it

in

filter

8.

or

replace

place and install

it

bolt

(0)

cover

8 toward right

in

the lateral direction,

may

be damaged.

If

cartridge

with a new one.

upper

filter

cover

G with

O is

-73

·

II

',!

ii

·1·

:,

11

,l

1,1

p

,

i'I

'

~

: '

p

d

q

!

1·

)

'I'

I

~

1

'

1

;

if

; !

,.·

I I

li

i.

Ii

;I

1!1

I

i:

!:

I·

1=

I

-·

~.

'.

6. TROUBLES AND CORRECTIVE MEASURES

Trouble

Case (1)

Case(2)

Check and Corrective

measures

Page

I

c,f

I

1. Needle

thread

breakage

Threading

Thread path

Needle guard

Needle

Needle heat

Thread Thread tension

Double

thread

OeHecuve

double chain-off thread

chain stitch) Threading

hooking

(only for double

(on1y

chain

for

stitch)

double

The

thread

Is

thread

needle

are

needle

the

thread

drawing

it

to

the

thread

entangled wllh

head

has

been

burrs

or

plate,

stltr.h

guide,

hits

the

prodUced

Is

too

thin for

thread

to

is

weak

positioned

up

of

the

again.

clause

referring to defective double chain-

Is

entangleo with

been

incorrecuy

machine

Scratches,

the

throat looper, needle thread take-up, needle thread presser spring,

The

edges

The

The needle gets very hot, depending on materials, number of plies causes

The The thread tension Is

The double chain looper or tower looper has been Improperly plate.

Poor to

catch

Refer off

thread.

The looper has

the

incorrectly threaded.

rust

on

the

pawts

tongue,

lower

or

tension

discs

needle

guard

on

them,

causing

the

thread.

and

bum

and break.

because

or

Its poor quality.

too

high.

and

strikes the

needle

thread

the

threaded.

thread guide,

or

looper,

intensely, and sharp

thread

sewing speed, and

feed

causes the looper

threacJ

or

needle

holes of

double

chain

causes friction.

breakage.

the

type of

dog or throat

guide, or the

the

Refer

to

the threading diagram.

Remove

such scratches. burrs,

path

finishing.

which

Replace the needle end needle guard if they

Replace

Use needle cooler. Use an S-point needle synthetic thread.

Replace the

Reduce the thread tension. Check whether the needle thread take-up guide and needle thread guide are positioned too high, causing such excessive thread tension.

Properly position the double chain looper

Increase the thread cam. Properly position the double chainstilch thread

Refer

Replace

have

been

defonned, causing thread breakage.

the needle by a proper one.

a thinner

needle.

Reduce the sewing speed.

thread

by

needle

thread tension. Properly position

guide.

to

lhe treading diagram.

etc.

major components such

one with good quality.

and

pel'1orm

as

have

or

needle for

or

lower looper.

thread

looper,

wom,

Use

the

22

12,20

32

Trouble

z.

Looper

thread

breakage

I

~

I

,__

______________

I

3.

Needle

breakage

-'

J-

Thread

Adjustment

Thread

Position

Double stitch)

Needle

-I

Needle

-f

Upper

, Contact

path

of

the

looper

tension

of

the

thread

chain

looper avoid

heat

entry

looper position

with

the looper

Case

guides

(1)

thread

(only

take-up

lor

double

Case(2)

Scratches, stllch tongue, looper, looper thread take-up, thread guide,

The

Improperly positioned, causing excessive thread

tension.

The

The The

taking balance Is disturbed, resulting in

breakage.

chain

The causing

The it needle

The the

The

.

The

I

breakage.

' double chain looper for

burrs,

rust,

etc,

on

the

paw

or

tension

discs

causes

friction.

looper thread

looper

thread

upper

double

the

needle

comes

stop.

needle

upper

needle strikes the looper, resulting

thread

is

looper

chain

gels

In

entry

strikes looper

weak

thread

hol,

contacl

take-up

tension

because

thread

looper

breakage.

and

with

has

not

the

throat

juts

out

or thread guide

is

too

high.

of

its

guitle

Is

too

strikes

the

looper

the

hot

needle at

been

correctly

plate

too

much

or presser loot.

of

poor

high,

needle

thread

or It

the

throat

has

quality.

and

the

at

the

breaks

the

adjusted,

Is

too

low.

in

plate,

been

thread

back,

when

time

of

and

needle~

I

Remove

path

have

Refer

Reduce other looper

Replace Refer

Correct so

Refer needle

Correct

Reier Re-position

with needle.

Check and Corrective measures

such

scratches,

finishing.

Replace

been

deformed,

lo

the

pertinent Standard

the

tension while checking

thread.

the

thread

to

the

pertinent Standard

the

longitudinal

as

not

to

cause

to

the

clause relating lo the needle heat causing

thread

breakage.

the

needle

to

the

tooper

the needle. Adjust the longitudinal motion of the

burrs,

etc.

or

Adjustment.

with

good Adjustment.

of

it

does

contact

other

the

and

the

double

not of

loopers

causing thread

by

one

motion

the

looper to strike

entry.

Standard Adjustment.

so

that

the

carry out

components

breakage.

tension

quality.

chain

the

needle.

come

in

its

back

with the

thread

balance

looper

contact

Page

which

62

20

8

18

to the next page

··.·•··

Trouble

4.

The

needle point Is crushed. (Double

stitch needle)

I

5. Overlocklng needle thread stitches are

:::j

skipped.

The

loops.

lower

looper

·

falls

Right

to

aide

catch

From the previous

chain

needle

thread

Wrong

side

Case (1)

page

r-----------------,

Needle

guards

Needle

No. Thread tension Height

or

the

feed

dog

or nnedle

Needle

guard

Contact

with

the

looper

Lower looper

Adjustment of Needle

Needle

the

loopers.

thread presser

guards

A

needle

guard

the

needle Tho The Tne feed dog Is

causing the needle breakage.

The

needle

Is

not

Tho

motion

The

blade

needle

1

The

clearance

The duration thread

The

needle

DC

x 1

Incorrect

the

needle. If a needle guard

crushed

has

point

to

needle

is

too

lhln

threAd

tension

too

guard C Is

correct.

tilt of

the

looper Is not correct. The longitudinal

of

the

looper

point

has

thread

loops.

or

the

In

which the presser holds the needle

Is

not

correct,

is

bent

Is

used.

height

or

clearance

with

consequent

Case(2)

been

Improperly

strike

for

is

too

high,

to

deflect wilh resultant needle

too

Is

nol

defective

amount

and

or

lfllJroperly oriented. A needle or

positioned,

It.

the

materials.

high.

or

the needle Is

low,

or

its

longitudinal

correct.

shape

and

of

retum

unstable

loop result.

prohibits

Is

too high, loops are

slltch skipping.

causing

too

position

does

not

Is

not correct.

correct guide for

low,

catch

Check and Corrective measures

Refer

to

the

pertinent Standard Adjustment.

Replace

the

needle

with a thicker one.

Reduce

the

thread

tension.

Refer

to

the

Increase the height clearance between

Check

the

of the looper,

looper and needle when the looper reaches Its most retracted position.

Replace

the

Refer

to

the

Refer

to

the pertinent Standard Adjustment.

Replace

the needle. Use a DC

Refer

to

the

of

the

needle guard (C). Check the

the

needle

and

needle guard.

tilt

of

the

looper.

Correct

and

increase

lower

looper.

relevant

Standard Adjustment.

bent

needle. Correctly orient

x J27

needle

pertinent Standard Adjustment.

the

clearance between the

for a stretchy thread.

longitudinal motion

and

attach

the

Page

22

8,24

22

20

12

22

to lhe next page

Trouble

Case (1)

Case(2)

Check

and

Corrective

measures

Page

6.

Lower

The

upper

looper

thread.

stitches

doea

Right.side

are

not

From the previous page

skipped.

catch

the

lower

Wrong

aide

.-------------------,

Height of

needle

Needle

heal

Positioning of

needle

Threading

Upper looper

Lower looper

. Adjustment

Thread

thread

of

amount

the

guide

the

needle

loopers

thread

take-up

guide

and

The

needle

pick

up

loops

Stitch

skipping

needle

heat.

They

are positioned too lake-up takes loops.

The

thread

The

reading

The

thread

Threading The

blade

loops.

The

looper The

looper, upper

Too thread.

point

clearance

are

not

leed

amount

or

clearance

and

lower

much

has

incorrect

even

too

has

not

between

correct.

lower looper thread

heigh!

if

the

looper

occurs

before

high,

much thread, producing

been

entangled

bot

been

correctly done.

been

entangled

been

done

has a bad

shape,

the

needle

of

the

lower

looper,

produced

loopers

Is

not

and

does

nol properly

has

a correct

return.

the

thread

breaks

due

and the needle thread

with a thread

correctly.

and

at

time

correct.

Is

fails

the

back

height

of

crossing

fed,

giving slack ol

10

of

too

guide.

catch

of

the

Refer lo

the

Adjustment.

to

Refer

to

the

clause

relating

to

with

the

thread

lhe

badly

guide (increase

due

to

needle

heat.

Refer

to

the

small

See

Refer

the

Replace

lower

upper of

Replace

Refer

the

Slightly lower the looper thread take-up (left) (reduclion in the

Slightly in

dimension Lower L), thread.

pertinent Standard Adjustment.

the

threading diagram.

to

the

threading diagram.

the

upper

looper

the

lower looper having a deformed

to

the

relevant Standard Adjuslment.

distance J),

amount of

and

or

slightly reduce distance I

thread.

raise

the looper thread take-up (right)

0)

to

lhe

decrease distance N to reduce the amount of

decrease

lower looper

needle

thread

deformed

amount of

breakage

blade

tip.

to

decrease

(Increase

thread.

in

distance

8, 12

62

point.

12,18

62

7.

Upper

The needle does

thread.

Lower looper

-~

Upper

I

......

~

I

a.

Double

The

thread

looer

thread

looper

chain

double

Joopa.

Needle

Trouble

thread

stitches

not

take the

Right side Wrong

slitches

are

chain

looper

tails

Viewed from the

are

upper

skipped.

to

catch

skipped.

looper

needle

side

Threading

Needle

height

Needle

Adjustment of

Amount

of

thread

Needle height

Needle

Double

chain

the

looper

Case

upper

(1)

looper.

The

thread

Threading The

needle,

catch

the

upper

The

needle

The

height upper looper needle.

The

clearance upper looper is

Excess!ve

of

thread.

II

the

needle

when

the

return

The

needle

' A

DC

x1

needle

The

lower part

and

the

blade

Case(2)

has

been

has

not

been done

If

positioned

looper

Is

bani or

of

lhe

blade

unable

to

between

not

correct.

upper looper

Need!:

k::?'"

is

not

correct,

or

the

is

bent or

is

used.

of

the

blade

point

fells

entangled

too

thread.

crushed,

point

Is

properly

the

needle

thread

slHch

chain

looper

attached

point

loops.

wllh a thread guide.

correctly. high or low,

in

not

pass

Is

Slack

skipping

wllh

Its

point.

correct,

the

thread

and

the

fed,

producing slack

of

thread

occurs

Is

correct.

wrong

orientation.

has

been deformed,

may

making

back

fail to

the

to

the

of

the

even

Check and Corrective measures

See

the

threading

diagram.

Refer lo lhe related Standard Adjustment

Replace

the

needle.

At

this

time,

be

reduce

the

enough,

recess

sure to eliminate

distance I

the

amount

amount of

Increase it.

configuration).

cause

for

such

needle

bend or needle point

Refer

to

the relevant Standard Adjustment.

Sllghtly lower In

distance J), or sllghtly

the

Make the uppor looper thread guide {right) (shprter

decrease

Slightly raise In

dimension O) to decrease

If

the

Refer

Replace the bent needle. (Remove the cause for the needle a

DC

Replace

the

looper thread take-up (left) (reduction

amount

of

thread.

in

distance K). to

the

thread tension is

to

the

pertinent Standard Adjustment.

bend.) Correct the orientation of the needle.

x27

needle

the

double

reduce

looper thread take-up (right) (increase

not

(with

a better

chain

looper.

crush.

to

decrease

or

thread

the

thread.

.

Use

Page

8

8,

18

62

/

Two stitches

are

skipped.

to

the

9.

Triangle

are

The

needle

looper

double

skipped.

falls

Ulreed.

Needle

Trouble

From the previous page

chain looper thread stitches

to

catch

the

double

chain

Viewed

from

side

le

ekfpped.

the

One

wrong

stitch

AdJustment Thread tension

Needle guards

Needle

The

Double

Adjustment ol looper

Thread

Thread tension

Threading

of looper

heat

needle poinl

chain looper

cam

timing

Is

Case

crushed.

(1}

Clearance

The

good loops.

A

clearance

The depending and

The

shoner. The

thread Excessive

this stilch skipping. Tho thread

thread triangle.

The lower thread not

The

erroneously.

or

returning

thread

tension

needle

guard

is

too

thread

breaks

on

the type of materials, number of plies,

sewing

speed.

needle

point

thread hole

does

not

rerum

cam

to

slack before the needle enters a thread

stretched.

area

around the thread cam has threaded

Case(2)

amount

is

not

is

too

high,

preventing formation of

is

too

high,

and

big,

due

has

In

the tip has worn,

reach

or longitudinal motion

timing

tension

loops

causing the needle to

to

heat

generated

been

crushed

the

needle

as

is

too

early, causing

Is

very low,

correct.

are

and

shown

will

and

crushed.

shake.

on

the

needle,

got thicker

the

at

right.

often cause

the

the thread

The

and

looper

Check and Corrective measures

Refer

to

the related Standard

Reduce

the tension. However, be careful not to reduce

the

tension too much, othrewlse

Reier

to

the

relevant Standard Adjustment.

Use

a thinner needle. Reduce the

the

coolant

if

necessary.

Refer

to

tho clause relating

Replace

tho double

Reier to tho pertinent Standard Adjustment.

Reier

to

the

pertinent Standard Adjuslmll!nt.

is

Increase

the

thread lenslon a little.

Correct the threading.

chain

to

looper.

Adjustment.

unstable

loops

sewing

speed.

the needle point

wm

result.

Check

crush.

Page

20

22

20

32

10.

Triangle

double

are

skipped.

The

needle

on

stitch

falls to

the

double

skipping

loop the

~/

k

~•

Trouble

chain

needle

thread

stitches

catch

the

needle

chain

shown

Defectively

looper,

below.

inter1aced

thread

resulting

loop

In

Neadleth'1

needle

thread

lo

the

adjacent

axtendu

stitch.

Double

chain

looper

Adjustment

Thread Stitch

Needle

Double-chain stitch

tension

length

guard

of

looper

Case (1)

needle

thread

guide.

The plate,

The

the The The

A

needle

loops.

The

to

tense

chain

or

return

loop.

needle sUtch

needle

looper

has

length

guaro

the

bad

is

not

thread

Is

thread

thread.

Case(2)

Is

too

shapo.

enough,

tension

Is

as

small

too

high,

guide

high

causing

is

Installed

is

and

too

as

too

close

lhe

low.

1.5

mm

catches

loo

to

needle

or

Jess.

needle

high,

the

and

throat

to

miss

thread

it

Check and Corrective measures

Correct

the

height

of

the

chain

until it

cones

Into

chain

looper

Refer

10

Slightly increase Slightly increase the

Adjustment of loopers for producing chain-off thread without

materials

materials. Refer

10

fails

Refer

to

having a bad

the

Standard

the

requires

Standard

looper by

the

stopper.

shape.

AdjustmenL

needle

thread

Stitch

length.

higher accuracy lhan that with

Adjustment.

pushing

tension.

It

Replace

down

the

Page

20

32

22

62

11.

Overlocking

Provided when sewing operation was done with

(

materials

that set

chain-on

no

on

thread

chain-off trouble

the

machine.

Is

bad.

occurred

]

Position of

Feed

Adjustment

·

Thread

dog

lension

the

of

throat

looper

plate

The lhroat plate has been improperly positioned longitudinally,

·

main off

thread.

The

The chain-off

(Lower Adjustment ol loopers

without The

The

balance

feed

auxmary auxiliary

thread.

than

materials

thread

needle

with

and

dog

and

feed

the

tension thread

other

chain-off throat

dog

The

main

requires

is

tension

thread

plate,

has

scratch.

Is

too

auxlllary

feed

dog

for

producing higher

too

low.

is

tension

thread

causing

high,

feed

t,y

too

high,

gets

in

between

defective

and

Interferes

dog

is

too

more

than

chaln-oll thread

accuracy.

causing

Chain-

with

low.

o.s

mm)

damaged

lhe

Correctly

position

Repair

or

replace

Refer

lo lhe pertinent

Re1er

to

the

SlighUy

increase

Check

whether thread guide excessive

needle

the

throat plate.

the

auxlliary

feed

dog.

Standard

Adjuslment.

Adjustment.

the

tension.

the

needle

thread

take-up

Is

posllioned too high with consequent

thread

tension.

And

guide

ii

so, correct

or

needle

it.

24

12

62

Trouble

Case

(1)

Case(2)

Check and Corrective

measures

Page

~

I

12. thread.

Problems

with double chain stitch

chain-off

Adjustment of loopers

Needle Guard

Position of

Throat plate

Presser foot

M11ln

Double

Thread tension

feed

hooking

the

dog

throat

plate

Adjustment without

The needle

The the

Tho the

of

the

loopers

for

materials requires higher accuracy.

guard

needle

comes

needle

hole

In

lateral position of

teed

dogs

Is

wrong,

producing

(C)

is

too

high, damaging

Into contact

the

throat

plate.

the

throat plate with

causing chain-off to drop

j

A dent exists

the

The

the thre11d.

The cuts chaln•olf thread.

The Insufficient return threading.

If the feed pllch Is too small. the

advanced. The

to

excessive

Both too

on

needle hole

the

and

=:,Oc::::c

rear

pressure foot is indented

presser foot sole,

leadlng

edge

ol the

needle

thread

1s

of

the

needle

Is

bend

or chain-odd

needle thread tension.

the

needle thread

low.

flat part between the feed

dog

groove.

l:.

Dent

so

that it cannot hold chain-off

main

feed

not

drawn

up

double chain looper or wrong

and

looper thread

chain-off

with

the Iron! edge ol

rear

and

not flush with

dog

Is

too

fully

because

cam

timing will be

thread

runs

tension

thread

loops.

respect

edge

sharp

of the

back

Refer

to

the related Standard Adjustment.

Refer

to

the related Standard Adjustment.

Correctly posrllon

to

In.

of

Repair

or replace

chain-off thread to

Replace ii, or correct foot

sole.

and

Buff

the leading edge of

Reier

to

the related Standard Adjustment

the double chain looper. See lhe

correct threading.

Aelard the

due

Reduce the needle thread tension.

are

Slightly Increase the both tensions.

cam

the

s6p

timing.

throa1

plate.

throat plate,

out.

ii

to

make

the

main

since

II

flush with

feed

lh1eadlng

sueh

dog.

for

dent

causes

Ille

presser

the

,eturn of

digram for

20

22

20.32

00

(I,)

excessive

tension

is

too

thin

thread

Is

too

cam

draws

cam

timing

Is

too

thin

of

end

lower looper

thread

Is

unsuited

on

the

thread

fool cones

and

teed

not

come

Case(2)

100

high,

needle

balarce

tor

tension

low.

out

Is

tor

the

needle

take-up

path

into

dogs

out

and

the

thread.

has

been

dlsturt:>ed.

the

lhread

used.

is

too

high,

and

an

insuflicient amount of

bad.

the

thread

used.

thread

Is

thread

tensions are not

(left)

is

too

high.

for

the

overedging

catch

thread.

contact

unevenly

and

tends

to

smoothly.

thread

take-up

the

needle

Insufficient.

width.

with

meander.

Check and Corrective measures

Refer

to

the

pertinent

Refer

to

the

to

the

knife the

the

II

With

the

relevant

the

relevant

the

needle

the

relevant

overedging

width.

thread

presser

thread

Standard

a proper

looper thread tension needle

the

looper

path for

foot

come

take-up components, and Increase necessary.

Replace

Reduce

Increase

Refer

Refer Replace Refer

Slighrly Increase tensions.

Slightly lower

Make

for Check

lhe

Make

Standard

Adjustment.

Adjustment

one.

thread

Standard

with

a proper

Standard

upper al\d lower looper thread

thread

width

come

out

tension.

Adjustment.

take-up

slightly

smalls

scratches.

Into

coniaa

smoothly.

for

one.

to

the

a

with

looper

the

minimum,

(left)

r

than

them

tension If

that

thread

and

given

evently.

Page

62

32

62

30

Case

thread

needle

(1)

take,.up

thread

guide

take-up

guide

and

They draws

..

The

The thread

The thread.

The The Drawing

The

enough. The The

Scratches The

throat Thread

are

out

thread

needle

looper

tension

thread

thread needle

amount

upper

looper knife

wld1h

presser

plate

dose

positioned

Trouble

Position

of

the

13.

Ovorlocklng

14.

Double

I

15.

Uneven

I

The

knotting

looper

chain

overlocklng

threads

needle

stitch

poshlon

varies

thread

needle

stitches

of

the

as

shown

Is

loose.

thread

upper

Is

and

below.

loose.

lower

naedla

Thread

Needle

Thread

Needle Double•chaln

Looper

LOoper

Knifewidlh

Thread

Presser

Thread stand

thread

tension

cam

thread

path

fool

needle

guide

stitch

tension

take-up

Trouble

Case (1)

Case(2)

Check

and

Corrective

measures

Page

ex,

~

Thread

16.

Uneven

double

chain

slllches

17.

The

looper

thread

bulges

out

18.

Looper

thread

bite

I

19.

Knotting

posllion is

I

Right

aide

not

correct.

Knots are deflected to

the

upper

looper side.

tension

Presser

foot

Knife

width

Looper

thread

Knife

width

Adjustment

Threading

AdJustmenI

of

or

take-up

the

looper

lhe

looper

adjustment

thread

take-up

thread

take-up

The

looper

The

pressor

unevenly. The

presser

The

knife

width

The

looper

thread.

The

knife

wldth

The

looper

of

looper

lhread.

Re-threading erroneously.

The

height of

correct

The

upper

thread

tension

Is

foot

comas

Into

contact

foot

pressure

Is

is

too

small

for

thread

take-up

draws

Is

too

large

for

thread

take-up

draws

after

.lhtead

breakage

the

looper thread take-up (lefl)

IOoper

thread

gulde

not

enough.

not

enough.

the

oul

(right) is

with

the

overedging

out

excessive

overedging

Insufficient

.etc.

has

too

tlvoal

been

short.

width.

looper

width. amount

done

Is

Slightly increase

plate

Make

the

plate

evenly.

Increase

Use

a knife having

Decrease (reduction

UJ>

(right) (Increase

Use a knlfe Increase the radius

(increase (right)

(reduction

See

the

not

Raise the looper lhread lake-up (lefl) amount moves

toward

Increase distance

presser fool

the presser

the

radius

in

dimension I).

having

dimension

lhreading

of

upper looper

tho

the

tension.

foot

width

of

In

distance

width

of I).

In

distance

diagram.

tower K.

come Into

pressure.

suited

the

looper

Raise

0).

suited

the

looper thread

Lower

the

0).

thread,

and

looper side.

contact

to

the

to

the

looper

with

overedglng

thread

looper

overedging

thread

to

the

knotting

the

throat

width.

take-up

(left)

thread

take·

width.

take-up

(lefl)

lake-up

Increase lhe

position

62

00

c.n

20.

Uneven

21.

Puckering

(Malnly

material lead

concemed

Trouble

with

double chain

stJIch)

Case (1)

Presser fool pressure

Presser

foot

TIit of

feed

dogs

Height

of

feed

dogs

Adjustment ol differential

Needle Thread

Thread tension

Throat plate Thread

cam

timing

Feed

dogs

feed

Case(2)

The

presser foot pressure

The

hinge is

too

Scratches

on

produce The

A different and

The

The The

Bolh

too

The The

The leading edge of the feed dog teeth has been

rounded

A difference and

or dafective

friction

between lhe presser

front is too high.

In

level exists between the main teed

dilferenlial

differential

needle thread

high.

throat

thread

differential

is too thick.

used

the

needle thread

plate has a large

cam

off.

in

feed

level exists

feed

Is

too

stiff.

flnlsh

dog.

has

been

improperly adjusted.

is

too

thick.

and

looper thread tensions are

needle

timing is too late.

between

dog.

high.

on

the

presser loot

foot

and

hole.

lhe

main

sole

materials.

dog

feed

dog

Check and Corrective measures

Reduce

the presser loot pressure except for the uneven

material

feed

due

to

packering,

Remove

the sllffness provided

Buff the presser foot sole for good surface finish.

Make the front down. However, be sure to align the differential feed dog wllh

Eliminate

the difference

Provide differential feed suited to

Use a thin Use

Reduce

Replace

Advance the cam timing. Refer to !he related Standard Adjustment.

Replace

Ellmlnate such difference in level.

needle

as

a thin needle

as

the both thread tensions to a minimum.

the

throat plate

the feed

dog.

the

In

much much

with

no

hinge

main feed dog.

level.

the

as

possible.

as

poSSlble.

one

with

a small needle hole.

play

material.

is

produced.

Page

24

to the next page

g

Trouble Case (1)

Case(2)

Check and Corrective measures

Page

From the previous page

Prosser foot pressure

Differential

Thread amount

I

feed

ratio·

The presser foot pressure

poor ironing effect.

The differential feed rallo has been set for gathering.

The

looper

excessively tensed stitches.

thread amount is not enough, causing

ts

not high enough, providing

Increase the presser foot pressure.

Set

it

for materials, contact unevenly with the materials.

Bring increase the amount of looper thread.

stretching.

be

the

thread cam thread guide fully to lhe front to

careful not

When

lo

stretching

cause

lhe

llght-welghl

presser

fool

28,28

lo

62

Fully,-suken type

-+

l-------=-----+----1v-

-

1 I

_.,_··~-·r--- :

I

t~

--

-88-

I

--

...........

-·-

-

i

E

IZS

I ..

(Nole)

All

dllMnslonll

are

In

mlllnN!er.

Pat

Ito.

of

table : 11951558

7.

DIMENSIONS

(1)

Semi-sunken typo

OF

TABLE

·-t-

i

i i

AppUcablt modtla

No..llCOSerln

--

-

-87-

I

I I

-~

(Not•)

All

Dollllad llmellslona

dlmaulonurt

In

mlllmctcr.

of-11on

WJN,

Maloll

Z.Z,

_.on

y.y

and

...:lion

y.y

I

-~

Pa11No.ofllllla:t1151400

' l

i

I .

I

LIUKI®

I

I:

JUKI

INTERNATIONAL

8-2· CHOFU•SHI,

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CORPORATION

1,

KOKURYO-CHO,

TOKYO

(81

):J.343().4001

(81)3-343o-4909 •

2002

rights

reserved

SALES

H.Q.

182-8655,

4914 • 4984

JUKI

CORPORATION.

throughout

to

4005

the

JAPAN

world.

Please do not hesitate

• The description covered in this engineer's manual

commodity without notice.

to

contacl

our

distributors or agents in your area for further information

is

subject

to

change

when

for

improvement

necessary.

of

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Juki M0-6000S, M0-6900G, M0-6900R, M0-6900J User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual