JUKI LK-1852-5, LK-1854-40, LK-1854-10, LK-1854-6, LK-1852-3 Engineer's Manual

UUKI

LK-1850 SERIES

High-Speed

1-Needle

Cylinder

Bed

Lockstitch

Bar

Tacking

Machines

ENGINEER'S

MANUAL

19

k

TOKYO

JOKI

INOUSTRIAL

CO.,

LTD

FOREIGN

TRADE

BUSINESS

DIV.

No.

IV-19

1983.7

PREFACE

This Engineer's Manual is written

for

technical personnel

who

are responsible for

the

service and

maintenance

of

the

machine.

The

Instruction

Book

for

the

machine

intended

for

the

maintenance personnel and operators at

a

garment

factory

contains

detailed

operating

instructions.

This

manual

describes

"Standard

Adjustment",

"HowtoAdjust",

"EffectsofAdjustment",

and

various

other

information

which

is

not

coveredbythe

Instruction

Book.

It is advisabletouse

the

relevant

Instruction

Book

and

Parts Book

together

with

this Engineer's

Manual

when

carrying

out

the

maintenanceofthe

machine.

CONTENTS

1.

SPECIFICATIONS

1

2. CAUTION IN RUNNING THE MACHINE BY HAND 2

3.

STANDARD ADJUSTMENT

FLOWCHART

@

4.

STANDARD

ADJUSTMENT

3

(1)

Height

of the

needle

bar 3

(2) Adjustment of the feed cam 3 (3) Position of the stop-motion hook 5

(4) Stop-motion timing 5

(5) Adjustment of the changing pulley pressingplate 7 (6) Adjustment of the starting leverstopper 7

(7) Adjustment of the safety plate g

(8)

Position

ofthe work

clamp

foot g

(9)

Height

ofthe

work

clamp

foot

11

(10)

Position

ofthe

wiper

H

(11)

Adjustment

ofthe

tension

release

bar

13

(12)

Positionofthe

shuttle

race

spring

13

(13)

Adjustmentofthe

timing

between

the

needle

and

the

shuttle

1g

1)

Timingofthe

needle

bar

1g

2)

Timingofthe

shuttle

1g

3)

Clearance

between

the

needle

and

the

shuttle

driver

1g

4)

Clearance

between

the

needle

and

the

pointofthe

shuttle

1g

5)

Clearance

between

the

needle

and

the

shuttle

race

(14)

(15)

(16)

(17)

(18)

(19)

(20)

(21)

(22)

15

Lateral

positionofthe

work

clamp

foot

iy

Adjustmentofthe

auxiliary knife driving

cam

Positionofthe

moving

knife

and

the

counter

knife

ig

Height of

the

moving knife and

the

counter

knife

Tiltofthe

counter

knife

blade

19

Adjustmentofthe

lengthofthread

remainingonthe

needle

2i

Adjustmentofthe

thread

take-up

spring

2i

Adjustmentofthe

belt

tension

23

Adjustmentofthe

bobbin

winder

23

5.

OTHER

PRECAUTIONS

25

(1)

Configurationofthe

shuttle

race

ring

25

(2)

Howtoremove

the

backlashofthe

shuttle

driver

shaft

25

(3)

Howtoremove

the

backlashofthe

main

shaft

25

(4)

Howtoremove

the

backlash

between

the

worm

and

the

worm

gear

27

(5) How to remove

the

backlash of

the

feed bracket

6. DISASSEMBLING & ASSEMBLING

PROCEDURES

AND

PRECAUTIONS

27

29

11,

(1) (2)

(3)

(4)

(5) (6)

(7)

Disassembling

the

shuttle

driver

shaft

2g

Disassembling

the

main shaft

Disassembling

the

speed reducer

Disassembling

the

high speed pulley (asm)

Disassembling

the

changing pulley •

Disassembling

the

low-speed pulley

Assembling

the

pedal pressure decreasing unit

7. PARTS TO BE FIXED

WITH

LOCKTITE

8. PARTS TO BE FILLED

WITH

GREASE

9.

EXPENDABLE

PARTS

(1)

General

ExpendableParts

(2) Expendable Parts To Be

Replaced

Infrequently

(3) Parts

Likely

To Be Lost Or

Damaged

During

Repair

10. PARTS FOR

SUBCLASS

MACHINES

(1) PartsFor

Changing

The Numberof Stitches

(2)

Special

Partsand

Devices

(3) Modifying The Standard

Machine

To Subclass

Machine

29

31

33

33 33

35

41

42

44

45 45

45

46

TROUBLES

AND

CORRECTIVE

MEASURES

47

1.

SPECIFICATIONS

Description

Standard

Subclass

Model

LK-1850

LK-1852-5

LK-1854-10

LK-1852-20

LK-185

2-30

LK-1854-40

LK-1854-6

LK-1852-3

LK-1854-4

LK-1852-1

LK-1854-11

LK-1852-2

AppUcation

Laig(>size

bartacking

Large-size

bartacking

Attaching

belt

loops

Attaching

belt

loops

Attaching belt loops

Attaching belt

loops

Knit

goods

bartacking

Knit

goods

bartacking

Buttonhole

bartacking

Buttonhole

bartacking

Small-size

bartacking

Small-size

bartacking

Sewing speed

(spm)

Max.

(cotton thread)

2300

Normal

(synthetic thread)

1800

Stitch diagram

'wmm

1

42

m A A A 4

"i V V V vx

WWWV^

21

TA

A A A S

bUUUUUVAl

riVVVVVV^

28

kwwi

Numberofstitches

42

28

21

28

42

21

28

21

28

21

28

Bartacking

mdth

(mm)

1.5

~3

1.5-3

0

1.3-3

(Standard

2.5)

1.3-3

(Standard

2.5)

1.5-3

(Standard

2.5)

1.5

- 3

(Standard

2.5)

1.5-3

(Standard

2.5)

1.5-3

(Standrd

2.5)

Bartacking length (mm)

8~I6

8-16

6.5~14

(Standard

14)

6.5

~ 14

(Standard

14)

13-25

(Standard

25)

18-35

(Standard

25)

4-8

(Standard

6.5)

4-8

(Standard

6.5)

4-8

(Standard

8)

4-8

(Standard

8)

4-8

(Standard

8)

4-8

(Standard

8)

Needle

DPx5

#14.

#16

DPx5

#14,#16

DPx5

#14.

#16

DPx5

#14,#16

DPx5

#14.#16

DPx5

#14.

#16

DP X5

#11

DP X 5

#11

DPx5

#14.#16

DPx

5

#14,

#16

DPx

5

#14.#16

DPx

5

#14.#16

lift

of piesserfoot (mm)

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

Max.

17

* The following specifications are

commontoboth

the

standard

and

subclass

models.

NeetOe

bar

stroke

41.2

Thread take-up

link-type thread take-up

Shuttle

race

Half-rotary shuttle race

(lubricatedthroughoilwick)

Adjustmentof bartacking

width & length

Byfeedregulator lever(fixed by nut)

Thread trimmingsystem

Threadspreader: Interlocked with main shaft,

Thread

trimmer:

Interlocked

with

lifter

Liftingsystem

One-pedal

system: Pedal

pressure

decreasing

unit (Standard)

Two-pedal

system:

Forfoot-treadle type P

(option)

Wiper

Interlocked

with

lifter

Bobbin

winder

Driven by belt

Drivingsystem

2-stage

Vbelt speed reducingsystem

Safety device

One-pedaldouble safety device

Lubrication

Lubricating oil: Juki New Defrix Oil No. 2

System: By centralized oil wick and

greasefilling

Motor

2()0W

(single-or 3-phase)

Weight(kg)

42.5

(Cautions)

1) A

madiina

for attaching belt loops is to be installed

sideways.

Refer to the figure at rightand the table drawing on the last page

of this manual for installing the pedal shaft supplied with the

machine.

2) See the

following

table for proper use of the feed plate and work

clamp

foot

according to belt loop length.

Feed plate

Work

damp

foot

LK-1854-10

Part

No.

13543608

Part

No.

13544408

LK-1852-20 (Standard)

Part

No.

13543608

Part

No.

13544408

LK-1852-30

Part

No.

13545504

Part

No.

13545603

LK-l 854-40 (Standard)

Part

No.

13545504

Part

No.

13545603

LK-185440

(25 mm or more)

Part

No.

13547005

Part

No.

13547104

3) Motorpulleyand belt (Theasterisked partsare

available

on specialorders)

Edge of

table

Motor

,

in

Opening

forbelt

Starting

pedal

shaft|/'

[ ' |

Starting

pedal

lever

J |

(Viewed

from

table

bottom)

Fig. I

Frequency Sewingspeed

Motorpulley

Part

No.

Numerical

mark

High-speedV belt

Low-speed V

belt

50

Hz

2300 spm *

13531108

(For

cotton

thread)

50-2300

• MTJVM005000

(50")

MTJVM004600

46"

2000 spm

*

13531207

(For

cotton

thread)

50-2000

* MTJVM004900

(49")

1800 spm

2300 spm

13531306

50-1800

60-2300

MTJVM004800

(48")

60

Hz

*

13531405

(For

cotton

thread)

•

MTJVM004900

(49")

MTJVM004600

46"

2000 ispm

*

13531504

(For

cotton

thread)

60-2000

•

MTJVM004800

(48")

1800

spm

13531603

60

1800

MTJVM004700

(47")

3.

STANDARD

ADJUSTMENT

FLOW

CHART

Adjustment

of

stop-motion

mechanism

Positioning the

stop-motion

hook

Adjusting

the

stop-motion

timing

Adjusting the

safety plate

Adjustment

of

speed reducer

Adjusting

the

chan^ng pulley

pressing

plate

Adjusting

the

starting

lever stopper

Standard Adjustment Flow Chart

Adjustingofpedal

pressure decreasing

unit

Removing the pedal

pressure

decreasing

unit

Installing the pedal

pressure decreasing

unit

Adjustmentofclamp

foot lifting mechanism

Positioning the

work

clamp

foot

Adjusting the height

of

the

work

clamp

foot

Adjustment

of

bartacking functions

Adjusting the lower deat

pointofthe

needle

bar

Adjusting the feed cam

Adjusting the

shuttle

race

spring

Adjusting

the

needle

and

shuttle

driver

Adjusting the right

and left work clamp

feet

Adjusting

the

auxiliary

knife driving cam

Adjusting the moving

and

counter

knives

Adjusting the

length

of thread remaining

on

the

needle

Adjusting

the

tension

of the thread take-up

spring

(Note)

The

solid

lines

with

arrows

( , ,

and the broken lines with arrows ( -•) represent the need for

readjustment

when

independent

adjustment

has

been

made.

) show

standard

adjustment flow.

U.

Adjusting the

bartack

ing width and length

@

Other

adjustments

t-

Positioning

the

wiper

Adjusting

the

teiuion

release

bar

Adjusting the belt

tension

Adjusting the bobbin

thread

winder

4.

STANDARD

ADJUSTMENT

Standard

Adjustment

(1) Heightofthe

needle bar

The upper marker line engraved on the needle bar should be flush with the bottom end of the lower

needle bar bushing when the needle bar is at the lowest point of its stroke.

(Note) Perform this

adjustment

first

before

making

any

other

adjustment.

Needle

bar

Needle

bar

bushing

(lower)

Upper

marker

line

Fig. 3

(2)

Adjustmentofthe

feed cam

Adjustment should be made so

that

the

feed is completed when the needle point

is 7 to 10 mm

(9/32"~25/64")

above

the

throat

plate surface.

(It is advisable to make this adjustment

during lateral feed). ^ ~ 10%

(9/32"~25/64")

-3-

&>—

E3

Fig. 4

Fig. 5

HowtoAdjust

1) Turn the drivingpulley by hand until the needle bar reaches the

lowest point of its stroke.

2) Removethe rubber plug from the face plate.

3)

Loosen

setscrew

(T),and

move

the

needle

barup or

down

to

make the adjustment.

4)

After

adjustment,

securely

tighten

setscrew

(T)

.

Loosen

nut

(T)

andthen cam

guide

pin .

This

will

allow

feed

cam (3) to bemovedin the direction of rotation for adjustment.

• When the feed cam is turned in direction A, the feed timing

advances.

• When the feed cam is

turned

in direction B, the feed timing is

delayed.

%

®

Fig.

6

(Caution)

Perform this adjustment first after

the

adjustment of

the

height of

the

needle bar. Make suretoreadjust

stop-motion

regulating cam

whenever

the

feed

cam

has

been

adjusted.

-4-

EffectsofAdjustment

• Improper adjustment willcause

stitch skipping or thread breakage.

Whenit is adjusted to 7 mm

(9/32")

or so, well-tensed

stitches

will

result.

Whenit is adjusted to 10 mm

(25/64") or so, protrusion of

the

first

stitch

needle

thread

onto

the

material

surface

will

be prevented when sewing

with

a synthetic thread.

Standard

Adjustment

(Note)

Strictly follow

the

orderofadjustment

for (3) through (6) shown below.

(3) Positionofthe

stop-motion

hook

Perfonn adjustment so that a 3 mm (1/8") clearance is provided between the stop-motion hook and the

stop-motion cam when the machine runs at a low speed.

%

Fig, 7

Stop-motion

regulating

cam

Stop-motion

regulating

cam

roller

Knife

driving

cam

0.7

~ 1. 2 %

Stop-motion

hook

'3

'Wl

Thread

trimmer

returning

roller

Driving

plate

3/64")

Stop-motion

cam

,Knife driving

cam

roller

0-0.

5%

(1/64")

Fig. 9

Fig. 8

(4) Stop-motion timing

Performadjustment to make the stop-motion regulating cam rollerdrop from the low-speed point of the

stop-motion regulatingcam onto the stop motion point at the moment the top surfaceof the stop-motion

hook

aligns

withthe centerof the

screw

No.

1on the

stop-motion

cam

at thelaststitchas

showninFig.

12.

Screw

No.

1

Stop-motion hook Stop-motion cam

Fig. 12

-5

-

Stop-motion

regulating

cam

roller

£

Stop-motion

regulating

cam

Fig. 13

HowtoAdjust

1)

Turn

the

main

shaftbyhandto obtainthe state

showninFig.

7.

(low-speed running)

2)

Remove

the

spring

(2)

and

spring

(D .

3)

Loosen

screw

(T),

and

perform

adjustmenttoallowa3mm

(1/8")

clearance

between

thestop-motion hookandthe

knife

driving

cam.

(Caution)

When

tightening

screw

(l),becareful

not to

cause

excessive

axial

sticking.

Fig. 10

Fig. 11

Loosen

three

setscrews

(D,

and

make

adjustment

within

the

slot.

-6

EffectsofAdjustment

If the clearanceis adjusted to

3 mm (1/8") or less;

A

neutral

state

will

result

when

the machine runs at lowspeed,

causing the machine to idle and

stop.

Further,

the clearance

of

0.7 to 1.2mm (45/64") ~

(3/64")

between the knife

drivingcam and the knife driving cam roller will go at the time of low-speedmachine running with

resultant striking noises. Also the

stop-motion

cam

will interfere

with the stop-motion

hook

at the

time of stop motion. (Fig. 8)

If the clearanceis adjusted to

3 mm

(1/8")

or more;

The pressure of spring will

become too high when the machine

mns at highspeed, often causing

the machine to idle and stop. It

may alsolead to inadequate torque

at the start of high-speedrunning

with consequent reduction in

sewing speed.

Also,the thread trimmer returning

roller

will

interfere

with

the

driv

ing plate, resulting in thread

trimming failure, (clearance : 0 to 0.5 mm

(1/64"))

(Fig. 9)

• If later than screw No. 1;

The brake will

not

work,

and

therefore a great stop-motion

shock

will

result.

Also, it may cause

the

machine

to stop at the first starting stitch.

• If earlier than screw No. 1; The brake will work excessively,

causing a

stop

motion

failure.

If the timing is extremely

too early, the stop motion will be engaged one stitchearlier,

producing an abnormal sound.

Standard

Adjustment

(5) Adjustment of

the

changing pulley pressing plate.

The

clearanceAshouldbeequaltoclearance

Bat the

time

ofstop

motion.

(A= B=0.4mm(l/64"))

(0.007")

.

0 2%

Changing

pulley

j

Low-speed

pulley

fKTT

r\

High-speed

pulley

^

B

0.4'

0.4%

(1/64")

Fig. 14 Fig. 15

Changing

pulley

pressing

plate

(6)

Adjustmentofthe

starting lever

stopper

Bring the startinglever into contact with the stopperscrew and make adjustment so that the starting lever,

when pulled, will stop at the moment the clearance between the stop-motion

hook

and the stop-motion

cam reaches3 mm (1/8") (refer to the previous clause(3)).

Starting

lever

Tobein

contact

with

stopper

screw

Fig. 17

Stop-motion

hook-

-7-

Stop-inotion

cam

3%

(1/8")

I /

tn

Fig. 16

HowtoAdjust

1)

Place

the stop-motion hook in the stop-motion position.

2)

Loosen

nut

(T)

and

then

screw

Q).

3)

Securely

tighten

screw

(3).

4)

Gradually

tighten

screw

untilequal

clearances

are

provided

at A and B. (A = B = 0.4 mm (1/64"))

Push down the starting lever and make adjustment so that the

starting lever comes in contact with the stopper screw when the

clearance between the stop-motion

hook

and the stop-motion

cambecomes3 mm (1/8") (refer to (3) Position of the stop-motion

hook), then lock it usingthe nut.

-8-

EffectsofAdjustment

If A si larger than 0.4 mm

(1/64")

while B is smaller

than

0.4;

Heat may be generated due to

the contact between low-speed

pulley and the changingpulley, or low-to-highspeed changing

feed timing may

not

synchronize

with

the

motionofthe

needle

bar, often causing the machine to idle and stop.

Also, the machine may fail to

reach the high sewing speed.

If

A is

smaller

than

0.4

mm

(1/64") while B is large than 0.4; An inadequate torque may be

caused in low-speed operation, or heat may generated due to the

contact between the changing pulley and the high-speed pulley.

If A + B + C is larger than the

specified value;

The machine may stop at the time when the sewing speed is changed

from low speed to high speed in

sewing extra heavy-weight material

or

the

like.

If the adjusted value is larger than

3 mm (1/8"), the machine will be put into idlingstate and stop at

the timeofstarting. If the adjusted value is smaller

than 3 mm (1/8"), there will be

no

allowanceinthe

slotofthe

starting lever when the machine

runs at high speed, causing the

levertobind.

Standard

Adjustment

(7)

Adjustmentofthe

safety

plate

Adjust

the

safety

plate

andthe

work

clamp

foot

lever

sothat a

lateral

clearance

of0.2to 0.5

mm

(0.007"

~ 0.019")is

provided

forA,anda

longitudinal

clearanceof1.5

to 2.5mm(1/16"~

3/32")

for B.

Work

clamp

foot

lifting

lever

Safety

plate

@

!S!

Down

Fig. 18

Fig. 19

(8) Positionofthe

work

clamp

foot

Tum the main shaft by hand and perform adjustment to equalize the both clearances A between the needle

and the work clamp feet in the longitudinal feed.

Alsomake equal the both clearancesBbetween the feed plates and the work clamp feet.

Feed

bracket

Feed

plate

Work

clamp

foot

B B

Fig. 20

-9-

HowtoAdjust

Loosen

setscrew

(T)tomake

adjustment.

After adjustment, securely tighten the setscrew.

1)

Loosen

screw0and

make

adjustmentofthe

work

clamp

foot

within

the

slotinthe

feed

bracket.

2)

Loosen

screw0and

adjust

the

position

ofthe

feed

plate

by the slot in the feed plate.

-10-

EffectsofAdjustment

If the clearance A is extremely

small, the work clamp foot will

notgoup.

If

the

clearance

B is

smaller

than

the specified value, the safety

plate and the work clamp foot

lifting lever will interfere with

each other, causing a stop motion

failure.

If

the

clearance B is

zero,

the

machine

can

notbestarted.

If the clearance A is too large,

the wiper and the thread trimmer

willbe actuated before stop motion, causing the wiper to

interfere

with

the

needle,orthe

thread

trimmertocut

the

needle

threadtoremainonthe

needle

too short with consequent slip

pageofthe thread from the needle

at stitching start.

If

the

two

clearancesAare

not

equal, either work clamp foot

may

interfere

with

the

needle,

leading to needle breakage during

longitudinal feed.

Standard

Adjustment

(9) Heightofthe

work

clamp

feet

Remove the top cover, and adjust the height of the work clamp feet by the screwlocated at the center of

the

frame.

The

maximum

lift of the work

clamp

feetis 17mm(43/64").

L-shaped

wrench

1 7

(10) Positionofthe

wiper

Fig. 21

j/r^

r\

A

The clearance between the wiper and the needle should be 1.5 mm (1/16") or more at the time

when the wiper passes by the needle point.

(The needle is in stationary state at the time of stop motion.)

o

1.5

(1/16")

j

;!

1

•czi

Height of

the

work

clamp

feet

Fig. 22

-11

-

HowtoAdjust

Stop the machine with the work clamp feet up, and loosen screw

(D to

make

adjustment.

If the right and left work clamp feet are

not

levelled, perform

further

adjustment

using

screw

@ .

Adjust the position of

the

wiperbyscrew

(T)

.

To move the wiper,

move

starting

lever

(2)

up and down, and

turn

pulley

(3) by

hand.

Be sure to bring the

stop-motion cam

into

contact

withAof

the

stop-motion

hook

as

shown in Fig. 24 when

making this adjustment.

Fig. 23

Stop-motion

hook stop-motion

cam

Fig. 24

-12-

EffectsofAdjustment

If the work clamp feet are too

high, they will interfere with the

wiper when the wiper is actuated.

If

screws

@ aretoo

low,

the

feed

bracket

will

interfere

with

the loweringshaft. (Point A)

If

the

clearanceissmaller

than

1.5nun (1/16");

The wiper will interfere

with

the

needle point, resulting in needle breakage or scratches on the

needle.

If the clearance is

much

larger

than 1.5 mm(1/16"), the needle

clamp screw will hit the wiper

when

the

needle bar goes down.

Standard

Adjustment

(11)

Adjustmentofthe

tension

release

bar

Tension

release

bar

(3)

should

project4mm

(5/32")

from

the

surfaceofsupporter

with

the

work

clamp feet up when the machine stops.

L-shapedwrench

"g"

Tension

lever

Fig. 25

(12) Position of the shuttle race spring

The

shuttle

race

spring

shouldbeevenly

positioned

laterally

with

respect

to the

needle

entry

point,

and

it

shouldbepositioned

longitudinally

sothat the

rear

edge

ofthe

needle

aUgns

with

corner

Aas

shown

below.

(Note)

Presence of any scrathes on area B may cause breakage of the bobbin thread. Grind and smooth

out

scratchesIfany.

Fig. 26

-13-

HowtoAdjust

Withthe machine in stationary state, remove the top cover

and

the

face

cover,

and

loosen

screw

(T)tomake

adjustment

with the work clamp feet up.

Removethe feed bracket, feed plate and throat plate, then

perform

adjustment

using

screw

(T)

.

(Note)

The

lateral

positionofthe

shuttle

race spring is

affected

also

bythe

locking

positionofsetscrew

(^.

Fig. 27

-14-

EffectsofAdjustment

If the projection of the tension

release

barissmaller

than4mm

(5/32"); The tension discswillbe

left released during machine

operation. If the projection is

muchsmallerthan 4 mm(5/32"), tension

release

bar (3) will come

off

supporter when the work

clamp feet begins to go up and consequently the work clamp

feet fail to go up. Also, the

tension

discs

will

notbereleased.

If the projection of the tension

release bar is larger than 4 mm;

The end of tension

release

bar(3)

will

hit

the

face

cover

when

the

work clamp feet go up, producing

a

loud

noise. Also,

the

thread

will

notbereleasedatthe

time

of thread trimming, and as a

result,

the

needle

thread

will be

cut

extremely short.

Lateral or longitudinal deviation of the shuttle race spring will

cause

the

needle

threadtobite

into

the

shuttle

race.

If the shuttle race spring is positioned excessively in the rear, the moving knife may fail to

catch

the

needle

thread.

Standard

Adjustment

(13) Adjustment of

the

timing between

the

needle and

the

shuttle

1) Timingofthe

needle

bar

Theneedle bar goesup fromthe lowest point of its stroke until the lowermarker line

engraved

on the

needlebar is flush with the bottom end of the needle bar bushing(lower). (Fig. 28)

2) Timing of

the

shuttle

Whenthe state is as described in the above 1), the center of the needle coincides with the point of the shuttle at A. (Fig. 29)

3)

Clearance

between

the

needle

and

the

shuttle

driver

Whenthe state is as described in the above 2), there should be no clearance between the needle and the

shuttle driver. (Fig. 30)

4) Clearance between

the

needle and

the

pointofthe

shuttle

Whenthe state is as described in 2), the clearance B between the needle and the point of the shuttle

should

be0.05 to 0.1 mm (0.001" ~ 0.004")-

(Fig-

31)

5)

Clearance

between

the

needle

arid

the

shuttle

race

The clearance between the side face of the needle and the shuttle race should be 7.5 mm(19/64"). (Fig. 32)

1) Timing of

the

needle bar 2) Timing of

the

shuttle

Shuttle

Needle

bar

Needle

bar

bushing

(lower)

'0

Fig. 28

Lower

marker

line

3)

Clearance

between

the

needle

and

the

shuttle

driver

Shuttle

driver

Fig.

30

5)

Clearance

between

the

needle

and

the

shuttle

race

7.5 %

(19/64")

Shuttle

race

Fig. 32

15-

CD

©

(D

Fig. 29

0.3-0.5%

(0.011"-0.019")

4)

Clearance

between

the

needle

and

the

pointofthe

shuttle

Fig. 31

0.0

5-0.1%

(0.001"-0.003")

HowtoAdjust

1)

Referring

to Standard Adjustment (1)

Height

of the

needle

bar,

make the lower marker line engraved on the needle bar flush with the bottom end of the bushing.

2)

and3)Loosen

setscrew

0 of

the

shuttle

driver,

and

adjust

the rotational and longitudinal directions of the shuttle driver.

(Caution)

Ensuretoturn

the

shuttleinthe

arrowed

directionasshown

in

Fig.29when

adjusting

the

timingofthe

shuttle.

4) Loosensetscrew (4) of the shuttle race, and turn eccentric

shaft

(D to

make

adjustment.

5)

Loosen

setscrew

0 to

perform

adjustment.

Enoughcare should be exercisedwhen performingthe

adjustmentdescribed in 4),

namely

the adjustmentof the

clearancebetween the needleand the point of the shuttle.

(Note)

The

clearanceinthe

rotational

direction

between

the

shuttle

and

the

shuttle

driver

shouldbe0.3mmto

0.5

mm

(0.011

0.019") as shown in Fig. 29.

Strike

points

C or D

for

adjustment.

After

adjustment,

check

that

point

C is evenly spaced

vertically

with

respecttothe

shuttle.

Fig. 33

-16-

EffectsofAdjustment

1) and 2)

Slightly

reduce

the height

of the needlebar (upper marker

line) for floppy material, and on

the contrary, slightly increase the

height for heavy-weightmaterial

to adjust the timingofthe

shuttle.

(For prevention of stitch skipping)

3) If the clearance is more than 0

mm,

the

needle

will be

bent

in

the direction of the shuttle point,

causing scratches on

the

shuttle

point

and

the

needle. On the

contrary,

however, excessive

contact

between

the

needle

and

the shuttle driver may cause

stitch skipping.

4) If the clearanceis greater than

0.05 to 0.1 mm (0.001 ~ 0.003"),

stitch skipping will occur. If it is smaller than the specifled values,

the needle strikes the shuttle point and scratches occur, leadingto

thread breakage or fine splits of

thread.

5) If the clearance is smaller than

7.5 mm (19/64") the needle

thread will

not

be fully spread,

often causing the needle thread

to

bite

into

the

shuttle.

•Ifthe

clearance

between

the

shuttle

drive

and

the

shuttle

is

greater

than

0.3to0.5 mm

(0.011" ~ 0.019"), the shuttle

noise

willbelouder.

On

the

contrary,ifthe

clearance is

not

enough, poorly tensed stitches

will result when sewing with a

thick

thread.

Standard

Adjustment

(14) Lateral positionofthe

work

clamp

foot

The center of the work clamp foot should lie at the

26th

stitch for 42-stitch largesize bartacking, and at

the 18th stitch for 28-stitch large size bartacking.

Fig. 34

26th

stitch

(for

42-stitch

large size

bartacking)

18th

stitch

(for 28-stitch large size

bartacking)

Fig. 35

(15) Adjustment of

the

auxiliary knife driving cam

The

clearance

between

the

endofthe

auxiliary

knife

driving

cam

and

roller(Dshouldbe0.3to0.5

mm

(0.0H"~

0.019")

when

roller©fits

inthe

recess

ofthe

knife

driving

cam.

Changing

pulley

Knife

driving

cam

<S)

Fig. 36

-17-

Auxiliary knife driving cam

Roller (2)

Roller

@

0.3-0.5%(0.0110.019")

(D

HowtoAdjust

Loosen

locknut

(T)

ofthe

feed

cam

roller

shaft,and

move

the

roller

shaft in the arrowed directions for adjustment. To conect slight deviation, loosen the lateral feed adjusting nut and push the work clamp foot to the right or left to perform adjustment.

1) Push down the starting lever, and manually turn the driving

pulley to lower the work clamp foot.

2) Further push down the starting lever,and turn the changing

pulley in the arrowed direction until roller fits in the recess

of

the knife driving cam.

3) Loosenthe setscrews,and make adjustment so that a clearance

of 0.3 to 0.5 mm (0.011"~ 0.019") is provided between the

end

ofthe

auxiliary

knife

driving

cam

and

roller

(3)

when

roller fits in the recess of the knife driving cam.

-18-

EffectsofAdjustment

• Improperly positioned center

of

the work clamp foot would cause

the needle to hit the work clamp

foot, leading to breakageofthe

needle.

If

the

clearance is extremely

large, the thread trimming timing

will be delayed, resulting in

thread trimming failure.

Ifnoclearanceisallowed

between

the endofthe auxiliary knife

driving

cam

and

roller

(3),

thread

trimming action will be inter

rupted at the timeofthread

spreading with resultant thread

trimming failure.

Standard

Adjustment

(16) Positionofthe

moving knife

and

the

counter

knife

Positionofthe

counter

knife

Positionofthe moving knife

The clearance between the counter knife and the needlehole guide

should be 0.5 mm(0.019")-

The needle hole in the needle hole guideshould meet the hole in the

movingknife at the time of stop motion (before the work clamp foot

goesup).

Counter

knife

0.5%

(1/2")

Needle

hole

guide

Moving

knife

Moving

knife

link

Fig. 37

(17) Height of

the

moving knife and the counter knife

Moving

knife : Engagement of the needlehole guidewith the

moving

knifeblade 0.15 mm(0.005")

Counter

knife:Difference

between

the

needle

hole

guide

andthecounter

knife

bladeinheight

0.1 to 0.15 mm (0.003"~0.005")

0.1-0.1

5%

(0.003"-0.005'

Counter knife Moving knife

f

r-w

1

u.i

• m

ylT')Tv

(0.005")

®

Needle

hole Throatplate

guide

Fig. 38

(18)

Tiltofthe

counter

knife

blade

The

counter

knife

blade

surface

shouldbetilted

by0.2mmto

evenly

cut the two

threads

(needle

thread

and bobbin thread).

0.5% -T

(1/2")

t

Counter

knife

\ ® ©

Fig. 39

-19-

-r-0.2%

t (0.007")

HowtoAdjust

1) Positioning the counter knife

Loosen

setscrew

(T),

and

adjust

the

positionofthe

counter

knife.

2) Positioningthe movingknife

Loosen

setscrew

@ ,

and

adjust

the

position

ofthe

moving

knife.

(Note)

The

normal

operationofthe

knives Is

such

that

the

moving

knife passes by

the

Inside of

the

needle hole guide as shown

by

A.

1) Adjusting the height of the

moving

knife

Adjust the height of the movingknife accordingto the thickness

of

washer

(3) of

Fig.

37. If properadjustment of the

moving

knife cannot be obtained, select and use one of the following

parts.

Part

No.

.

Description

Thickness

B242328000A

Moving

knife

washer

0.4

m/m

B242328000B

Moving

knife

washer

0.5

m/m

B242328000C

Moving

knife

washer

0.6

m/m

B242328000D

Moving

knife

washer

0.7

m/m

2) Adjusting the height of the counter knife

Wrench

portion

@

usingascrewdriver

orthe

liketomake

adjustment.

Shave

side

threadonside

(g) isnot

trimmed,orshave

side

threadonside

trimmed.

(Caution)

Make

suretoform

either

side Into an angle smaller

than

90

degree

when

shaving

sides

©.

2

JZL-O,

Acute

angle

-20-

EffectsofAdjustment

If

the

clearanceissmaller

than

0.5 mm (0.019"), the thread will

be trimmed by the blade point

of

the

counter

knife

when

the

moving knife pulls the threads

and

therefore

the

needle

and

bobbin

threads

willbetrimmed

too

short.

If the clearance is greater than

0.5 mm (0.019"), the thread

remaining on the fabric after thread trimming will be longer. If the moving knife is deflected

to

the

counter

knife,

the

thread

trimmer

willbeactuatedatthe

timeofstop motion, or the thread

spreader will fail to work properly,

resulting in thread trimming

failure.

If the moving knife isspaced too

much

from

the

counter

knife,

the

thread trimming mechanism will

stick, causing thread trimming

failure, or

the

needle will

strike

the moving knife, leading to needle breakage.

Insufficient

differenceinlevel

(specifiedvalue: 0.25 to 0.3 mm)

(0.009"~

0.011") between the

moving

knife and the counter knife

will lead to thread trimming failure.

Excessive

differenceinlevel

(specifiedvalue: 0.1 to 0.15 mm)

(0.0030.005")

between the

needle hole guide and the counter

knife will cause the blade point

of

the

counter

knifetotrim

the

threads when the moving knife

pulls the threads, and as a result,

the

needle

and

bobbin

threads

willbetrimmed

too

short.

If

the

tiltissmaller

than

0.2

mm

(0.007"),

the

threadonside

©

will

notbetrimmed.

If the tilt islarger than 0.2 mm

(0.007")

the

threadonside

©

will

notbetrimmed.

Standard

Adjustment

(19) Adjustment of

the

length of

the

remaining needle thread

Thelengthof the thread

remaining

on the

needle

after thread

trimming

shouldbe 35 to 40 mm (1-3/8'

1-37/64") from the needle eye.

In caseof a synthetic thread, the remainingneedle thread should be longer than that of cotton thread.

Tension

controller

No.

1

N

Fig. 40

(20) Adjustment of the thread take-up spring

Stroke:

Should

be adjusted so that the thread

take-up

spring

moves

approx.8 mm (5/16") from

the horizontal of the L-shaped thread guide.

Tension:Make

adjustment

while

checking

the stitch performance.

(The

proper

tensionissuch

thatthe

thread

take-up

spring

moves

for

the

full

strokeinactual

sewing operation.)

Thread

take-up

spring

a

Fig. 41

-21

-

HowtoAdjust

Perform adjustment by the tension controller No. 1.

• As the tension controller No. 1 is turned in direction A, the

length of the remainingneedle thread will be reduced.

• Asthe tension controller No. 1 is turned in direction B, the length will be increased.

(Caution)

Take care

nottomake

the

thread release timing

too

late for

thread

trimming,

otherwise

the

needle

thread

will be

trimmed

too

short.

RefertoStandard

Adjustment

(11).

1) Adjustingthe stroke.

Loosening

setscrew

(T),

insertascrewdriver

into

tension

controller

No.

2 (2)to tum it for

adjustment.

2) Adjustingthe tension

First securely tighten the setscrew, then insert a screwdriver into tension controller No. 2 to turn it for adjustment.

-22-

EffectsofAdjustment

Insufficient lengthofthe remain

ing thread will cause the thread

to slipoff the needle at

sewing

start.

If the remaining thread is too

long, the needle thread will

protrude

onto

the material, or

clumsy wrong sideofmaterial

will

result.

If the stroke is greater than 8 mm

(5/16"), the thread remaining on

the needle will be

too

short,

and

the thread will slip

off

the needle

at sewing start.

Standard

Adjustment

(21)

Adjustmentofthe

belt

tension

Boththe

high-speed

belt and

low-speed

belt shouldslackabout 10 mm(25/64") whenthe

middle

of the belts (the point shown by arrow) is pushed by a fingerunder an approx. 1 kg pressure.

Driving pulley

i

Idler

puller

Motor

pulley

Fig.

42

Fig. 43

(22)

Adjustmentofthe

bobbin

winder

The clearance between the bobbin windingwheel and the V belt should be about 3 mm (1/8") when

the wheel is

not

winding a bobbin.

Brake

0

1

Vbelt

/

Winding

belt

support.

,

Bobbin

presser

boss

(D

:±]

_rj

III—i

Fig. 44

3%

(1/8")

Fig. 45

Fig. 46

-23

-

HowtoAdjust

1) Adjusting the high-speed belt tension

Adjust the tension of the high-speed belt first.

Loosen

fixing

screw

(l)

and

nut ,

and

move

upor

down

themotor

mounting

basetomake

adjustment.

When

proper

belt tension has been obtained, tighten the screwand nut.

2) Adjusting the

low-speed

belt tension

Loosen

screws

Q) in

the

holes

(three)ofthe

driving

pulley,

and

move

the idlerpulleyto the rightandleft to makeadjustment.

When

properbelt tensionhas been obtained,tighten the three

screws.

1) Adjustthe positionof the V belt by

moving

the motor or the

motor pulley.

2)

Perform

adjustmentbyscrew@so

that

the

winding

belt

support

comesin light contact with the edge of the belt while a bobbin is

being wound.

Tobein

light

contact

3) If a

bobbiniswound

unevenly,

loosen

screw

0 and

bend

the

bobbin winder to the right or left.

M

Bendtothe

left.

Bendtothe

right.

4) To adjust the amount of thread to be wound round a bobbin,

loosen

nut (2) and

move

backor forth the bobbin

presser

boss

to make adjustment.

-24-

EffectsofAdjustment

Excessive tension of the high

speed belt will prevent

smooth

mnofthe high-speedpulley with

consequent reduction in high

speed operation.

Inadequate tension will increase

idlingvibration, and prevent the

machine from reachinghigh speed,

causing the machine to idle and

stop.

If

the

clearance

allowedissmaller

than 3 mm

(1/8"),

the belt will

touch the winding wheel and

wear

out.

If the belt support fails to come

in light contact with the belt, the

winding speed will be low.

5.

OTHER

PRECAUTIONS

Precautions

(1)

Configurationofthe

shuttle

race

ring

If the shuttle point has been found worn

out

severely, remove the shuttle race ring and check

whether the hatched portion on the rear side

measures

0.2 mm(0.007") x 8 mm (5/16").

0.2%

(0.007")

(2)

Howtoremove

the

backlashofthe

shuttle

driver

shaft

Shuttle

driver

shaft

Gear

connection

^ 1 ^

Fig. 48

(3)

Howtoremove

the

backlashofthe

main

shaft

Screwdriver

0 Thrust collar

Fig. 49

-25-

-t

8%

(5/16")

* n r

Fig. 47

Procedures

If the hatched portion does not measure0.2 mm (0.007") x

8 mm (5/16"), correct it usingan oilstone.

Removing the axial backlash

Loosen

two

setscrews

(T)ofthe

thrust

collar,

and

tighten

them

while pushing the shuttle driver shaft in the directionofarrow.

Removing the rotational backlash

Replace

the gearconnection by an appropriate one selected

among the followings.

o 13508353 Shuttle drivershaft gear connection (Y)

(0.2 smallerin dia.)

o 13509054 Shuttle drivershaft gear connection(Z)

(0.1 smallerin dia.)

o 13509153 Shuttle driver shaft gear connection (A)

(Standard)

o 13509252 Shuttle drivershaft gear connection (B)

(0.1 larger in dia.)

o 13509351 Shuttle driver shaft gear connection (C)

(0.2 larger in dia.)

•

Tighten

thrust

setscrews

(T)

and

while

twisting

the

crank

in the direction of arrow using a screwdriver or the like.

Setscrew

(T)isthe

first

setscrew.

Tightenitso

thatit

fits

to

the fiat partofthe main shaft.

• The properplayis0.01 to 0.04 mm.(0.0003"~ 0.0015").

(Note)

Make suretocheck

the

timingofthe

feed

cam

and

the

stop-

motion

cam

after

removing

the

backlash.

-26-

Remarks

•

An

axial

backlashonthe

main

shaft would adversely affect the

speed reducer and the feed timing.

Precautions

(4)

Howtoremove

the

backlash

between

the

worm

and

worm

gear.

Cam

shaft

Worm

gear

(D Crank rod

Worm

Fig. 50

(5)

Howtoremove

the

backlashofthe

feed

bracket

Backlash of the feedcam roller(Fig. 74) or feed slide block (Figs. 73 and 74) would lead to lateral or

longitudinal backlash of the feed bracket.

-27-

Procedure

1) Remove the top cover.

2)

Loosen

four

screws

(T)

•

3) Holdingthe cam shaft, turn the worm in the direction of arrow with care taken not to disturb the timing between the main

shaft

and

the

cam

shaft.

This

will

make

the

worm

advance

toward the rear bushing of the main shaft, removing the

backlash.

4)

After

removing

the

backlash,

securely

tighten

four

screws

(X).

(Note)

If

the

timing

between

the

main

shaft

and

the

cam

shaft

has

been

disturbed,

readjust

the

stop

motion

timing

and

the

feed

cam.

1) Replacethe feed cam roller by one of the followings.

B250228000A

Feed

cam

roller

(69

5

+0.005

B250228000B

Feed

cam

roller

09.5

B250228000C

Feed

cam

roller

09.5

_o.So5

2) Replace the feed slide block by one of the followings.

13516604

Feed

slide

block

12 °

-0.009

13516703

Feed

slide

block

+0.009

0

13516802

Feed

slide

block

+0.018

+0.009

-28-

Remarks

An

excessive

backlash

would

adversely affect the feed timing.

If no

backlash

is allowed,

the

worm will get

hot,

and the main

shaft torque willincrease, causing

stop motion failure or idling stop.

6.

DISASSEMBLING

&

ASSEMBLING

PROCEDURES

AND

PRECAUTIONS

Disassembling & Assembling Procedures

(1) Disassembling

the

shuttle

driver

shaft

1) Remove the pedal pressure

decreasing unit.

2)

Loosen

setscrew

(T),and

remove

the

shuttle

driver.

3) Loosen the two setscrews of

the

thrust

collar.

4) Loosen and remove the set-

screw

of

the stop-motion

regulating arm B, and take

out

the stop-motion regulat

ing arm B down from the

shaft. (See Fig. 72)

5) Draw

out

the shuttle driver

shafttothe

rear.

* Assemble them by reversingthe above disassembling procedure

(2) Disassembling

the

main

shaft

1) Remove the speed reducer.

2) Remove the needle.

3) Remove the stop-motion lever.

4)

Loosen

two

setscrews

(Dof

the counterweight and four

setscrews

of

the

worm.

5)

Loosen

two

setscrews

(5) of

the

crank

rod,

and

remove

the

crank

rod

cover.

6) Loosen and remove two set-

screws

@ of the thrust

collar.

7) Loosen and remove setscrew

0 of the

main

shaft

rear

bushing.

Shuttle

driver

Thrust

collar

Fig. 51

DO

8)

Remove

the

thread

take-up

spring

( (3) in

Fig.

11),

and

position

the

knife

driving

cam

arm

sothat it

doesnot interfere with the rear end of the bushing.

9)

Applyasbrass

barto pointA,tap it to

draw

out the

main

shaft

together

with

rear

bushing

(2).

*

Assemble

them by

reversing

the abovedisassembling procedure.

-29

Precautions in disassembly

• When drawing out the shuttle driver shaft, never remove the

dowel pin from the shuttle driver shaft gear,or else the shuttle

drivershaft needle bearingwillbe damaged.

a

Dowel

pm

• Besure to use a soft metal such as a brass bar when tapping

point

A.

At this time, remember to tap it gradually.

-30-

Precautions in Assembly

• When reassembling the same

gears,

put

the mating faces

of

the gearsto their original

position to prevent loud gear

noise.

To assemble the main shaft, place a covering piece on the end

of

knife

driving

cam©,and

tap

it gradually using a brass bar or

the

liketodriveinthe

rear

bushing of the main shaft.

Securely fit the

endofsetscrew

the

long

groove

ofthe

rear bushingofthe main shaft,

and

fit

it.

Disassembling & Assembling Procedures

(3) Disassembling

the

speed

reducer

1)

Remove

the

presser

plateof the

changing

pulley.

(Fig.

15)

2)

Loosen

setscrews

(D to

remove

ball

bracket

(2)

.

3)

Loosen

setscrews

(|)toremove

washers@and

mounting

disc

(s)

.

4)

Remove

low-speed

pulley®,adjusting

shim

(5)

and

pulley

spacer

(8)

.

5)

Loosen

setscrew

A

and

then

setscrew

B 0

(tapered

screw)toremove

low-speed

pulley

shaft

(Q)

6)

Remove

changing

pulley

0

and

low-speed

pulley

spring

© •

7)

Loosen

setscrew

,

then

loosen

and

remove

setscrew

(large)O(tapered

screw)toremove

high

speed

pulley

0 .

* Assemble the unit by reversing the above disassembling procedure.

Fig. 53

-31

-

Precautions

in Disassembly

Note that setscrew B is a tapered screws.

Low-speed

pulley

shaft

O

canberemoved

only

by

loosening the screw, however, it is advisable to remove

the screw for easier assembly.

32-

Precautions in Assembly

1)

Attach

d)

sothat

tapered

screw

O

enters

tapered

hole

®.

2) Apply grease to the low-speed

pulley springs before attaching

them

to (© .

3)

Attach

(Q)

sothat

tapered

screw

0

enters

tapered

hole

(g) in the mainshaft. At this

time,becareful

nottocause

springs

0 to

interfere

with

the

flatheaded

screwsofthe

changing pulley, and also

not

to

twist the pulley springs.

(Caution)

Take

care

notto

overtighten

0

otherwiseItwouldbedifficult

to

remove It later. (35 kg-cm)

Screw

4) The clearances between low-speed

pulley®,changing

pulley

© ,

and

high-speed

pulley

0

should

be about 0.4 mm(0.015") each.

(Tieck

thatacontraction

of

about

1 mm is obtained when the

part

shown by an arrow in the figure

below is pushed forcibly (0.2 mm

(0.007")

-»•

0 mm). Perform this

adjustment by increasing or decreasing the number

of

adjusting

shims

(2)

(0.1

mm (0.003")in

thickness).

* As the number

of

the adjusting

shims is increased,

the

clearances

willgrowlarger.

0.2 %

(0.007")

uftfU

mmn

WA]

JMLI

1

%C0.039")

mm

Push

here

Disassembling & Assembling

Procedures

(4) Disassembling

the

high-speed pulley (asm)

1)Byremoving

bearing

snap

ring(Dfirst,

then

pulley

spacer

and

adjusting

shim

(D,

high-speed

pulley

(2)

canberemoved

together

with

ball

bearing

snap

ring0,washer0and

ball

bearing

0

(Ball

bearing0has

been

force-fitted.)

2)

Remove

preload

spring0and

pulley

spacer

0 .

3)

Loosen

three

screws

O

and

the

high-speed

cluth,

and

high-speed

clutch

@

canberemoved

from

stop-motion

cam

0)

.

4) Stop-motion cam pawl and safety stopper

springOcanberemovedbydrawing

out

stop-motion

cam

(0)

.

(Stop-motion

cam

0isforce-fitted.)

* Assemble the high-speed pulley (asm) by

reversingthe above disassemblingprocedure.

<D

(5) Disassembling

the

changing pulley

1)

Loosen

and

remove

setscrew

0 of

the

changing

pulley.

2)

Changing

pulley

shaft0comes

off

changing

pulley

(2).

Fig. 55

(6) Disassembling

the

low-speed pulley

1)

Remove

ball

bearing

snap

ring0and

then

washer

2)

Low-speed

pulley@and

ball

bearing@are

force-fitted.

Fig. 56

-33

0

Precautions in Disassembly

When

taking

ball

bearing®out

from

high-speed

pulley

(2),

remove

snap

ring

{4)

and

washer

(D,

then

push

the

inner

ring in

the

directionofarrow.

0.2

±0.05-H

(0.007"

±0.002")

Adjusting

shim

•

Carefully

remove

setscrews

(T)

since

they

are

fixed

by

lock

tite.

-34-

Precautions in Assembly

1) Apply grease to stop-motion cam

pin 16 before force-fitting it.

2) Apply a thin coat of grease to

surface

® ofthe

stop-motion

cam.

3) Adjust the clearancebetween

high-speedclutch and high

speed

pulley

(2)byincreasing

or

decreasing the numberofadjusting

shim(D(0.1mm(0.003")

in

thickness).

* As the number of the adjusting

shims is increased,

the

clearance

will grow smaller.

4)Toinstall

ball

bearing®,apply

a thin coatofgreasetothe inner ring, and push the outer ring to force-fit it into the pulley. At this

time, take care

not

to produce

scratchesonthe

end

surface

of

the high-speed pulley.

5) Of the three setscrews for the high

speed

clutch,

one

setscrew

O is

shorter

than

the

rest.

Use

this

shorter

screw

for

(§)

stop-motion

cam

O •

Apply lock tite to three setscrews

©.

When force-fitting the ball bearing,

take care

not

to produce any

scratches

on

the

end

surface

of

the low-speed pulley.

Disassembling & Assembling Procedures

(7) Assembling

the

pedal pressure decreasing

unit

1)

Attach

reverse

rotation

preventing

latch@and

spring

(D to

mounting

base0by

hinge

screw

0,

fixthem by nut (5) .

2)

Drive

lowering

shaft

collarB0)

into

input

shaft

0)

.

3)

Fit

clutch

spring

(5)

onto

pressure

decreasing

clutch

latch0so

that

the

endofthe

spring

comes

in

contact with the pinofthe clutch latch.

4)

Attaching

screw

0 to

thrust

collar®for

sleeve,

set

them

onto

inner

sleeve0).

Then

install

them

so that the grooveof the inner sleeve fits to the pin of the pressure decreasingclutch latch.

5)

Apply

Esso

TemprexN3to

outer

sleeve

Cj).and

attach

itsothat

the

stopper

pinofthe

outer

sleeve

comesincontact

with

the

endofclutch

spring

(j).

6)

Apply

Esso

TemprexN3to

input

shaft

O ,

then

attach

needle

bearings©and

(Q),and

collar

A O

to the input shaft.

7)

Attach

input

shaft

O to

ball

bearing

@ ,

and

fixitby

snap

ring

© •

8)

Attach

outer

sleeve

guide

ring

(©toouter

sleeve

(Q),then

install

the

assembly

including

O

through

(0

and

the

assembly

comprising0through

0 .

O

-35

-

Precuations

in Assembly

1) Pay attention to the attachingdirection when attaching the

reverserotation preventing latch, spring, and hinge screw.

Use

locktite to fixnut (?).

2)

When

driving

collarB(01

into

input

shaft

(Q),make

their

end

surfaces

flush

with

each

other.

Flush

3) Theclutch springshouldbe

screwed

onto the pressure

decreasingclutch latch so that the end of the spring comes

in contact with the stopper pin. However, be careful not to screw the spring onto the latch excessively, otherwise the

spring will be deformed.

Apply Esso Temprex N3 to the circumferenceofthe screw.

Pay attention to the orientation of the spring.

4)

Grooveofthe

inner

sleeve

Fin

Endofthe

spring

5)

Bring the pin

into

contact

with

the

endofthe spring, and

turn

the

outer

sleeveinthe

directionofarrowtoattachitto

the

inner

sleeve.

-36-

Precautions

in Disassembly

• To remove the clutch spring, draw it out while wrenching

point

®

usingasmall

screw

driverorthe

like.

Do

not

forcibly pull

out

the spring, or

the spring would be deformed.

Disassembling & Assembling Procedures

9)

Install

input

shaft@assemblytopressure

decreasing

unit

frame,

(from

the

directionofarrow

A)

10)

Attach

idler

mounting

plate

(3)topressure

decreasing

unit

frame

(T)bysetscrew

(3).

11)

Inserting

pressure

decreasing

shaft

from

directionB(shownbyarrow),

driveindowel

(^,

aligning the tapered holeofthe shaft

with the tapered hole

of

the pressure

decreasing

clutch

latch

(Fig.

57,

©).

12)

Tighten

setscrew

(J).

13)

Attach

spring

suspension

to

work

clamp

foot

lifting

lever

link

(T).

14)

Attach

upper

and

lower

work

clamp

foot

lifting

levers

(D to

work

clamp

foot

lifting

lever

link

®

by

hinge

screw

(3).

15)

Using

setscrew

A ®

and

setscrewB(5),attach

lever

latch

A ®

and

lever

latch

B @ to

work

clamp

foot

lifting

levers

(§),

respectively.

(D

®

Fig. 59

37-

Precuations in Assembly

6)

When

installing

theinput

shaft

to the

pressure

decreasing

unit

frame,

take

care

not to

pinch

reverse

rotation

preventing

latch

7) The

dowel

pinis tapered,and thereforedo not

drive

it in

reversely.

8)

Use

lock

tite to

fix

setscrews

A 0

andB0.

9)

Apply

grease

to thepartsof

hinge

screw

(3) and

spring

suspension0onto

which

the

springishooked.

-38-

Precuations in Disassembly

When

taking out the dowelpin,

be careful not to hit it reversely,

or

else

the

head

wouldbecrashed

and the dowelpin would not come

out.

To draw out pressure decreasing

shaft (5), draw out the dowel

pin,

loosen

setscrew

® ,

and

tap the shaft from direction A.

Disassembling & Assembling Procedures

16)

Using

hinge

screw

(3)

and

eccentric

pin0,attach

work

clamp

foot

lifting

lever

(asm)

(2)topressure

decreasing

unit

frame

0 .

17)

Fix

eccentric

pin0by

setscrew

0.

18)

Inserting

stopper

screw0into

pressure

decreasing

unit

frame

0 ,

fixitusing

nut

0 .

19)

Attach

tension

spring

(8)tothe

work

clamp

foot

lifting

lever.

20)

Tighten

sleeve

thrust

collar

screw

((8) of

Fig.

57).

© @

Fig. 60

-39-

Precuations in Assembly

10)

11)

Apply

greasetohinge

screw

(3)

and

eccentric

(§).

Make

adjustmentbyeccentric

(J)sothat

the

end

of

reverse rotation preventing latch comes in contact

with

the

pressure

decreasing

clutch

latch

((6) of

Fig.

57)

by 1/4 to 3/4

when

latchAof

work

clamp

foot

lifting

lever@touches

the

stopperofouter

sleeve((Q)

of

Fig. 57).

Reverse

rotation

Outer

sleeve preventing latch

Pressure decreasing

clutch

latch

In

contact

by

1/4to3/4

12)

When

the

clutch

spring

(^ of

Fig.

57)

has

been

replaced

and the adjustment has been considerablydisturbed,

replace

the clutch springor cut the springend on the

pressure

decreasing

clutch

latch

(® of

Fig.

57).

The

reverse

rotation preventinglatch should come in contact with the pressure decreasing clutch by 1/4 to 3/4 at the point shown below.

13)

14)

Outer

sleeve

The

clearance

between

outer

sleeve

( O or

Fig.

57)

andlatchAof

work

clamp

foot

lifting

lever

(g)

should

be 0.5 mm (0.019").

Adjust

the

clearancebystopper

screw

©.

0.5%

f

(0.019")

I—

Stopper

screw

Fix the screwofthe pressure decreasing sleeve collar in a

position where it does not touch points A when the outer

sleeve

is turned with latch A of work clamp foot lifting

lever

in

contact

with

the

circumferenceofthe

outer

sleeve.

Screw

-40-

Precuations in Disassembly

7.

PARTS

TO

BE

FIXED

WITH

LOCKTIGHT

Sinceagreat

number

ofstartsand

stops

are

expectedinoperating

this

machine,

the

screws

that

are

likely

to

loosen

have

been

fixed

with

lock

tite.

Accordingly,

whenever

thesepartshavebeen

disassembled,

clean

themwiththinner and dry

well

before

applying lock tite to them for reassembly.

If it is difficult to remove a screw fixed with lock

tite,

heat

it with a torch lamp or the like.

Theparts using lock tite that are usuallydisassembled are asshown below.

(1)

Stop-motion

lever

shaft

•

Endofthe

lever

shaft

(2) Stop-motion lever

•

Endofstop

link

rod

(3) Changing pulley

•

Setscrews

Setscrewsofchanging

pulley

Screwonthe

stop-motion

lever

stud

Fig. 61

(4)

Throat

plate

•

Knife

driving lever

stud

Knife

driving

lever

stud

Fig. 64

Fig. 63

^—Stop-motion

spring

adjusting

nut

(large)

i-motion

spring adjusting

nut

(small)

Fig. 62

(5) Work

clamp

foot

lifting lever

• Work clamp

foot

lifting lever latch

Work

clamp

foot

lifting

Setscrew(B)

/

lever

latch

(A)

(6)

Shuttle

driver

shaft

gear

•

Gear

dowel pin

Setscrew@

Work

clamp

foot

lifting

Setscrew®

Dowel

Fig. 66

Fig. 65

(Caution)

Lock

titeisused

for

many

hinge screws. Be

very

careful

nottoallow

lock

titetosticktotheir

shafts,

or

else

the

functionsofthe

parts

may be damaged.

-41

-

8.

PARTS

TO

BE

FILLED

WITH

GREASE

(1)

Refill

grease

once

every

other

yearorwhen

the

parts

filled

with

grease

have

been

disassembled.

(2) Grease to be used

Lithium-based grease

Maker

Description

Esso

Lithen

2,

Beacon

2,

Shell

Clvania

Use Esso

TemprexN3for

the

pedal

pressure decreasing

unit

components,

(supplied

with

the

machine)

(3) Partsto be

filled

with

grease

If a

grease

pump isnot available, usea plasticoiler or an injector with its needleremoved.

1) Main shaft components

2) Pedal pressure decreasing unit compoments

Hinge

screw

Bushing (rear)

1

.4

11

Insideofthe

pressure,

decreasing

shaft

(Temprex

N3)

Bushing

(middle)

Fig. 67

3) Speed reducer

Insideofthe

main

shaft

Inner

ringofthe

bearing

Low-speed

pulley

springs

Sliding

partofthe

changing pulley

Fig. 69

-42-

Hinge

screw

•©

4) Feed bracket components

Ball

Fig. 70

5)

Stop-motion

lever

components

6) Lowering lever and stop-motion connecting

lever

components

Stop-motion

lever

j

leaf

spring

Inside

of stop-motion

(1^

lever

shaft

Stop-motion

hook

Insideofgrease

box

Hinge

screwsofstop-motion

connecting

lever

Hinge

screw

of

lowering

lever

Lowering

roller

Setscrew

of

stop-motion

regulating

arm

(B)

Fig. 71

7) Longitudinal

and

lateral feed

components

Feed

regulator

shaft

Insideofthe

regulating

arm

shaft

Fig. 72

Grooveinfeed

plate

Pivot

stud

Lateral

feed

slide

block

Grooveinlateral

feed

regulator

I

Longitudinal

feed

slide

block

Grooveinlongitudinal

feed

driving

arm

Longitudinal

feed

driving

arm

stud

Lateral

feed

regulator

stud

Fig. 74

Lateral

feed

driving

arm

shaft

Fig. 73

8) Knife driving cam

components

Knife

driving

cam

roller

Auxiliary

knife

driving

roller

Lowering

link

lever

Fig. 75

-43

-

Feed

cam

roller

9.

EXPENDABLE

PARTS

(1) General expendable parts

Part

No.

Description

Needle

B1818280000

Shuttle

B24222800A0

Moving

knife

B2424280000

Counter

knife

B2426280000

Needle

hole

guide

B3112761000

Thread

take-up

spring

B2303280000

Tension release

Cautionininstallation

Check

that

the

clearanceof0.3(0.011")

to 0.5 mm

(0.019")

is provided

between the shuttle

and

the

shuttle driver. If

not,

correct it in

accordance with the pertinent "Standard Adjustment".

Select a proper washer for the moving knife

and

perform adjustment so

that

the moving knife blade engageswith

the needle hole guide by 0.15 mm

(0.005")

rs^

o

" o

°

6.

Perform adjustment to provide a 0.1

(0.003")

to

0.15mm(0.005")

difference

in level

between

the

counter

knife

blade

and

7

the needle

hole

guide.

m >

lo

—

to

o

) foS

o

" o

oci

Replace this part if its needle hole has been scratched or grown bigger in diameter. Whenever installing a new needle hole guide,

check

the

heightofthe

moving and counter knives.

(2) Expendable parts to be replaced infrequently

Part

No.

Description

Cautionininstallation

13503750

High-speed

clutch

disc Refer to 6. Disassembling/assembling procedures for replacement.

13504402

Changing

pulley

13504709

Low-speed pulley

B1215280000

Stop-motion

cam

latch

B1217280000

Stop-motion

cam

latch

driving spring

13520309

(Changing

pulley

pressing

plate

Replace this part when the portion in

contact

with

the

ball has been

depressed, scarcely providing no tilt.

13520408

Driving

plate

Replace

this

part

when

point

A has

worn

out

and

the

moving

knife

is allowedtomove

in

low-speed

operation,

producing tapping

sound.

f )|

13522206

Stop-motion

regulating

cam

roller

Whenever replacing

the

roller,

the

snap ring

RC0470611KP

should

be also

replaced

withanew

one.

13523808

Qutch

spring Refer to 6. Disassembling/assembling grocedures for replacement.

(3) Parts likelytobe lost or damaged during repair

Part

No.

Description

Cautionininstallation

B2549280000

Balls

(seven)

for

feed

bracket

Apply

grease to

these

balls to

prevent

them

from

falling

when

installing

them.

SS1060210TP

Needle

hole

guide

setscrews

(two)

B1253980000

Stop-motion

ball

Apply

greasetothe

ball

before

installing

it.

44-

10.

PARTS

FOR

SUBCLASS

MACHINES

(1) Parts

for

changing

the

numberofstitches

Model

No.ofstitches

Worm gear

Worm

Stop-motion regulating cam

LK-1852

28

13510904

13510805

13538301

14

13510904

13510805

13539002

LK-1853

36

13511100

13511001

13538400

LK-1854

42

13510409

13510300

13522008

21

13510409

13510300

13539200

(2) Special

parts

and devices

Application

For

lifting

the

work

clamp

foot

by 2

pedals For

using

two

pedals

with

a

machine

table

for

attaching

belt

loops

For

long

needle

(DPx

17,DIx3)

For

thick

needle

(#19

or more)

For

thick

thread

For

making

shuttle

rotation

angle

greater (for sewing

canvas

shoes)

For

higher

tension

of pressure spring

Description

Foot-treadle

type

lifter

(for

P)

Belt

cover

for

P

Pedal

shaft

(asm)

for

P

Needle

bar

Needle

bar

thread

guide Wiper

Shuttle

race ring

(for

#23

needle)

Needle hole guide

(without

boss)

Needle

hole

guide

(with

boss)

Thread

take-up

spring

Tension

spring

No.

2

Large oscillating

rock

shaft

Spring

Part

No.

13545959

13546809

13547658

D1401L7VV00

D1405L7AM00

D2101L7AM00

D1818282N00

D1817282N00

B242628000B

D2426L7AM00

D3112L4BB00

B3129053000

D1805MLBH00

13519004

-45

-

Remarks

Howtoinstall

Slot

groove

Lowering

lever

Lowering

roller

Removing

the

pedal

pressure decreasing

unit,

fit

theslot inthe

lowering

lever

on the backof the

lifter

onto

the lowering roller, and fix it using

three

setscrews.

0\

(3) Modifying

the

standard

machinetosubclass

machine

(Follow

the

arrows

shown

below

for

modification.)

Modification

within

the

same

numberofstitches

Partstobe

replaced

Remarks

Feed

cam

Feed

plage

Work

clamp

foot

(right) Work

clamp

foot

aeft)

Modification

within

the

same

numberofstitches

but

with

division

Partstobe

replaced

Remarks

Feed

cam

Feed

plate

Work

clamp

foot

(right) Work

clamp

foot

Oeft)

Stop-motion

regulating

cam

Comesintwo

types

for

same

number

of

stitches

with

or

without

division

Refertothe

paragraph

cover

ing

the

stop-

motionreflating

cam.

Modification in

which

the

numberofstitches

is changed

Partstobe

replaced

Remarks

Feed

cam

Feed

plate

Work

clamp

foot

(right)

Work

clamp

foot

(left)

Stop-motion

regulating

cam

Exclusive

cams

are

available,

depending

on

number

of

stitches

Refertothe

paragraph

cover

ing

the

stop-

motion

reflating

cam.

Worm

Replace

accord

ingtonumber

of

stitches.

Refertothe

paragraphs

cover

ing

the

worm

and

worm

gear.

Worm

gear

Replace

accord

ingtonumber

of

stitches.

Refertothe

paragraphs

cover

ing

the

worm

and

worm

gear.

Modifiedtosubclass

machine

Modification in which bartacking size is also changed

Condition

; Change

from

standard

machine

Description

Part

No.

Bartacking size :

40mm

(lateral

feed)

x

20mm

(longitudinal feed)

Feed

pressing

plate

13519103

Modification in which the

countofneedle is also changed

Description

Part

No.

Countofneedle

Remarks

Needle

hole

guide

D2426282C00

#11

DPx5

B2426280000

#14~#18

DP X5

Standard

B242628000B

#19

or more DP x 5

Shuttle

race

ring

B1817280000

#ll'-#18DPx5

Standard

D1817282N00

#19

or more DP x 5

Needle

bar

B1401L7W00

DPxl7

#19ormore

For

extra

heavy

weight

material

(canton

flannel)

Needle

bm:

thread

guide

B1405L7VV00

DPx

17

# 19 or more

10 pliesormore

11.

TROUBLES

AND

CORRECTIVE

MEASURES

Trouble

1. Tlie machine stops in the idling area

between losv-specd

and

high-speed

operation. (The machine stops at the

second or third stitch (idling area)

after

it is

started.

2. The machine docs not run at higli

speed.

(Change between low-speed and

high-speed is

not

made,

and therefore

the

machine

does

not

runatnormal

sewing

speed.)

3. Tliemachinekeepson runningand

does not stop in continuoussewing.

Cause (1)

1

-1)

The pressing plate has been positioned

improperly.

1

-2)

Tlie starting lever is pulled down

excessivelyto the high-speed idling

1

-3)

The

clearance

between

the

clutch

and

the

pulley

istoo

large.

—I

1-4)

The

safely

place

has

stuck.

—

1-5)

The tension of the high-speedor

losv-spced

beltLsnot

high

enough.

I 6) The stop-motion

hook

h-asbeen

positioned improperly.

I 8) The idling

areaisreached

when

the

needle

penetrates

material.

I 9) Tile machine torque is abnormally

large.

2

-1)

The pressingplate has been po.sitioned

improperly.

2-2)The

clearance

between

the

clutch

and

the pulley is not

correct.

2-3)

The machine torque is too large.

2 4) Belt tension is not high enough.

2-5)

The clutch slips.

3

-1)

The stop-motion lever has stuck.

3-2)

The pressingplate has worn or is in

wantofgrease.

Cause

(2)

2) - A Tlic starting leverstopper has been

positioned

improperly.

4)-A

Tlie .safetyplate has stuck against the

pedal

pressure

decreasing

unit.

6) A An

c.xcessive

clearance i.sprovided

lietwecn the

stop-motion

hook

and

the .stop-motion cam

when

the

machine

runs

at low speed.

7)-AInwant

of grease

8) -A The stop-rootion timing is wrong.

19) A

The

worm

hasnobacklash.

H

TIic

crank

rod

ha.<

.ituck.

9) C Tlic feed cim roller .sticks against the

feedcam

groove.

5)-AThe

clutch

ha.s

worn.

5) B Tlie clutch has grease on its surface.

47

Corrective

measures

1

Correct

the

positionoftlie

prctsine

plate.

(RcfciloStandard

Adjustment

(5).)

Correct the position of the .startingicvetstopper. (Refer to Standard

Adjustment

(6).)

Reduce

the

number

of the

adjusting

shims.

(Referto

Disassembling

&

Assembling

Procedures.)

Correctthe

clearance

between

the

safety

plateand the workclampfoot

lifting lever. (Refer to Standard Adjustment (7).)

Collect the tension of the belt. (Referlo Standaril Adjustment(21).)

Correctly

positionthe

stop-motion

hook. (Refct to

Standurd

AdjuMmcnt

(3).I

Supply grease through the hole in the main shaft. (See "Parts to be rUlcd

with

grease".)

Correctthe

Mop-motion

timing. (Refctto Standard

Adjustment

(4).)

J 1

Provide

the

worm

withaproper

backlash.

(RefertoOther

Precautions

(4).)

] II

Move

the

orcilbting

rock

shaft

laterallytocorrect

the

sticking.

Replace the feed cam roller with a proper one. (Refer to Other Precautions

(5).)

Correctly

positionthe

pressing

plate. (Referto

Standard

Adjustment

IS).)

Correctthe position of the

pressing

plateand the starting leverstopper.

(RefertoStandard

Adjustment

(5)and

(6).)

1

Remove

slickingofthe

main

shaft,

shuttle

driver

shaft,

etc.

Correct Iwit tension. (Refer to Standard Adjustment (21).)

Increaseordecrease

the

numberofadjusting

shims.

(Referto

Disassembling

Procedures.) If this docsnot correct the trouble, replacethe clutch.

Gcan

the

clutch

surface.

Supplygreaseto the stop-motion lever.

Replace

the

pressing

plateorapply

grcaaie

to the

pressing

plate.

Trouble

Cause (1)

Cause (2)

Corrective

measures

4. Tlic clutch gets hot. (The clutch gets hot during idling.)

S.

Abnormal

soundisheard.

6. The stop motion is not engage.

(The machine stops without entering

the

stop

motion.)

7. The

slop

motion is engaged during

liigli-speed operation.

8. Titc work clamp fool will not go up.

(The work clamp foot will not rise

even

though

the

motor

runs.)

41)

The pressing plate has been positioned

improperly.

4

-2)

The high-speedpressingplate has worn

out.

4-3)

Tlie clearance between the

higli-speed

and low-speed tapered clutches is less

than

0.8

mm

4-4)

The clearance at the high-speedflat

clutchismuch

smaller

than

0.2

mm

4 -5) The inner ting of the high-speed

bearingis in want of grease.

5 1) The

bearing

has worn

out

or

scratched.

Correctly position the pressing plate. (Refer to Standard Adjustment (5).)

Replace the pressing plate.

Increasethe number of the adjustingshims. (Refer to

Disassembling

&

Assembling Procedures.)

Decreasethe number of the adjusting shims. (Refer to Disassembling &

Assembling

Procedures.)

Apply grease to the inner ring.

-]6-1)

Tlie

machine

torqueislarge.

|

—|

l)-A

The

worm

hasnoback-lash

1

Replace

the

bearing.

(RefertoDisassembling&Assembling

Procedures.)

|

] 1

Provide

the

worm

withaproper

back-lach.

(RefertoOther

Precautions

(4).)

|

—I

Check

each

part

for

proper

adjustmenttoeliminate

such

excessive

torque.

]

6-2)

The stop-motion is too early, and the

stop motion is engaged one stitch

earlier.

7

-1)

The

changing

pulley

deflects

much.

|-

7-2)

Tlie stop-motion timing is too late.

7-3)

The high-speed clutch has grease on

its

surface.

7•-4) The pressing plate has been positioned

improperly.

-| 8-I) nie

belt

slips.

[-

8-2)The

safety

plate

sticks!"

8-3)

Failure with the pedal pressure

decreasingunit.

1) ' B Excessive

torque

due to maladjustment

of the parts.

—

1)-A

The tension of the low-speed belt is not

high

enough.

i)

- B The heightofthe work clamp foot is

OTong.

1)-C

Tlie

work

clamp

foot

comes in

contact

withthe wiper.

3)-A

The reverse rotation preventing latch

does not engage with the pressure decreasing clutch latch properly.

Correct the stop-motion timing. (Refer to Standard Adjustment (4).)

Replace the

part.

Correct the stop-motion timing. (Refer to Standard Adjustment (4).)

Gean

the

clutch

surface.

Correct the position of the pressing plate. (Refer to Standard Adjustment

(5).)

Correct the belt tension. (Refer to Standard Adjustment (21).)

Correct the height of the work clamp foot. (Refer to Standard Adjustment

(9).)

Correct the position of the wiper. (Refer to Standard Adjustment (10).)

Correct the clearance between the safety plate and the work clamp foot

lifting lever. (Refer to Standard Adjustment (7).)

Correct the length of the clutch spring or the eccentric shaft, or replace the

clutch spring. (Refer to Disassembling& Assembling Procedures.)

3)-B

The stopper .screwof the pressure

decreasing

unit

frame

has

been

adjusting improperly.

Correctly adjust the stopper screw. (Refer to

Disassembling&Assembling

Procedures.)

'

3)-C

The

clutch

spring

has

worn

out.

"] 1

Replace

the

clutch

spring.

(RefertoDisassembling&Assembling

Procedures.)

3)-D

The

input

shaft

has

worn

out.

| 1

Replace

the

input

shaft.

(RefertoDisassembling&Assembling

Procedures.)

|

-48-

Tk'ouble

Cause

(1)

C^use

(2)

Corrective

measures

9. The work clamp foot will not go down.

(The

work

clamp

foot

will not dcitccnd

even

though

the

motor

runa.)

10. The starting lever will not move even when the pedal is depressed.

11. Abnormal

sound

(cimttcring)

is heard

grom

the

pedal

pressure decreasing

unit.

12. The thread slips

off

the needle.

(The thread slips off the needle at

the

rir.st,

.secondorthird

stitch

before

any

stitchisformed.)

-| 9-1)

Tlie

safety

plate

sticks.

[

9-2)

The

tension

release

bar

hits

other

part.

)-

10-l)The

stop-motion regulating arm sticks.

10 '

2)The

work clamp fool comes down.

but the pedal

cannot

be dcpresitcd

to the machinestarting position.

10

3)Thc

starting lever stopper has been

maladjusted.

I)The

clutch

spring

is wearing

out

(chattering).

—\II2ITIic

clutch

spring

slips,

(chattering)

11 - 3) The reverse

rotation

preventing latch

engages

with

the

pressure

decreasing

clutch

latch

improperly.

(chattering)

—III•4)Thc

ball

bearinghasscratches.

12 I) Stitch skipping at

the

first

stitch.

12 2)The thread remaining on the needle

isnot longenough.

12 -3)Tlic bobbin thread is not long

enough.

12 4)The bobbin thread protrudes due to

racingof the bobbin.

2)-AThe

tension

release

bar

hits

the

face

plate.

2) A The safety plate has been adjusted

improperly.

Correct the clearance between the safety plate and the work clamp fool

Uftinglever. (Refer to Standard Adjustment (7).)

Correctly adjust the tension release bar. (Refer to Standard Adjustment (11).)

Remove the axial sticking. (Refer to Standard Adjustment (3).)

Correct the clearance between the safety plate and the work clamp foot lifting lever. (Refer to Standard Adjustment (7|.)

2)-B

The

starting

lever

stopper

has

been

Properly adjust the starting leverstopper. (Refer to Standard Adjustment

adjusted

improperly.

(6).)

Correctly adjust the starting lever stopper. (Refer to Standard Adjustment

(6).)

Supply grease to the

clutch

spring.

-j2)A

The

clutch

spring

has

worn

out.

| 1

Replace

the

clutch

spring.

(RefertoDisas-scmbliiig&Assembling

ftocedures.)

]

~|

3)-A

The

clutch

spring

has

worn

out.

[——|

Replace

the

clutch

spring.

(RefertoDisassembling&A.sseinbling

Procedures.)

[

1)—A The timing

between

the

needle

and

the

shuttleiswrong.

—I

1)-B

The

feed

timingiswrong.

2) -A

The

tension

controller

No.1has

been

adjustedimproperly.

2)-6

The

tension

release

bar

has

been

maladjusted.

2)- C The stroke of the thread take-up

spring has been maladjusted.

Correct the eccentric

sluft

or the length of the elulch spring.

(Refer to Disassembling & As.semblingProcedurc.s.)

—{

Replace

the

bearing.

~|

Correct

the

timing

and

the

clearance

between

them.

(RefertoStandard

Adjustment

(13).)

Correct the timing of the feed cam. (Refer to Standard Adjustment (2).)

Correct

the

tension

of the

tension

controller

No. I.

(RefertoStandard

Adjustment

(19).)

Correctly adjust the tension release bar. (Refer to Standard Adjustment

(11).)

Correct the strokeofthe thread take-up spring. (Refer to Standard

Adjustment

(20).)

2)-DTire

differenceinlevel

between

the

counter knife and the moving knife

is

not

correct.

Correct

the height of the moving knife and the

counter

knife. (Refer to

Standard

Adjustment

(17).)

3)

- A

The

differenceinlevel

between

the

counter

knife

and

tlic

moving

knife

is

not

correct.

Correct the height of the moving knife and

the

counter

knife.

(Refer

to

Standard

Adjustment

(17).)

—I

3)-B

The

shuttle

race

spring

has

scratches.

) 1

Remove

the

scratches.

|

3)-C

The

bobbin

thread

tensionistoo

high.

49-

Correct

the

bobbin

thread

tension.

Replace the bobbin case and the bobbin with tho.seexclusively used for

LK-1850.

Trouble

Cause

(1)

Cause

(2)

Corrective

measures

13.

Needle

btcakage

!4.

Stitch skipping

15.

Thread

breakage

13-1)

The

clearance

between

the

shuttle

driver needle

guard

and the needle

is

not

correct.

—I13-2)

The

feed

timingisnot

correet.

—I

13-3)

The

needle

hole

guide

has

scratches.

[-

13-4)

The needle hits the work

cbmp

foot.

-5)

The

needle

hits

the

moving

knife.

}-

14

-I)

Tlie

timing

between

the needle and

die

shuttleiswrong.

14-2)

Tltc

needleisbentorhas

been

attached

improperly,

or the

needle

point is blunt.

—I143)

The

feed

timingisnot

correct.

14-4)

The

clearance

between

the

shuttle

driver

needle

guard

and

the

needle

is

not

correct.

15I)Scratchesonthe

shuttle.

15-2)

Tlie

thread

bites

into

the

shuttle.

—IIS3)

i

file

shuttle

driver

has

scratehes.

15

-4)

The

clearance

between

the

shuttle

driver

and

the

shuttleisnot

correct.

—I

IS-5)

The

needle

hole

guide

has

scratches.

"{-

1) A Scratch on

pointA(duetoneedle

strikingthe shuttle)

1)-B

Scratch on point B (produced when

the

needle

bendsorbreaks)

1

)-C

Scratch on

point

C (The shuttle has

been

scratchedatthe

needle

when

removed.)

1

)-D

Scratchonpoint

D

2)-A

The shuttle race spring has been positioned improperly.

2)-B

The

shuttle

blade

point

A has been

rounded.

(———f^"

2)'-C

Tile

shuttle

race has

positioned

improperly.

—

2)~D

The

needle

thread

tensionLsnot

high

enough.

50

Correct

the

clearance

between

the

needle

and

the

shuttle

driver.

(RefertoStandard

Adjustment

(13).)

-|

Correct

the

feed

cam

timing.

(RefertoStandard

Adjustment

(2).)

Remove

the

scratches,orreplace

the

needle

hole

guide.

|

Correct

the

positionofthe

work

clamp

foot.

(RefertoStandard

Adjustment

(8).)

—I

Properly

position

the

moving

knife.

(RefertoStandard

Adjustment

(I6)~

Correct

the

timing

and

clearance

between

them.

(RefertoStandard

Adjustment (13).)

—I

Replaceorproperly

attach

the

needle.

|

—I

Correct

the

feed

cam

timing.

(RefertoStandard

Adjustment

(2).)

Correct

the

clearance

between

the

needle

and

the

shuttle

driver.

(RefertoStandard

Adjustment

(13).)

Smooth

out the shuttle

point

with an oil stone, then burnish using a blue

polisliing

sand

bar or the like.

Correct

the clearance between the needle and

tlic

shuttle.

(RefertoStandard

Adjustment

(13).)

Smoothitout

svith an oil

stone,

then

burnish

using a

blue

polislting

sand

bar

or

the

like.

Smoothitout

with an oil

stone,

then

burnish using a blue polishing sand bar

or

the

like.

Smoothitout

with

an oil

stone,

then

burnish using a blue polishing sand bar

or

the

like.

Correct the position of the shuttle race spring. (Refer to Standard Adju.stmcnt

(12).)

Replace the

shuttle.

Correct the position of the shuttle race. (Refer to Standard Adjustment

(13).)

Correct

the

needle

thread

tension.

1

Remove

the

scratches.

~]

Correct

the

clearance

between

the

shuttle

driver

and

the

shuttle.

(Refer to Standard Adjustment (13).)

-|

Remove

the

scratches,orreplace

the

needle

hole

guide.

|

Trouble

16.

Thread

brcak.^attimeofthread

Irimminj:. (normal

thread

trimming

is not dime

at

the

last

stitch,

and

cilhci

needle

threadorIxibbin

tJireadiscut.)

)7.

Thread

trimming

failure (Ttte needle

threadorbobbin

threadisnot

trimmed,orthe

needle

thread

is

trimmed

extremely

lung or

short

upon

completion

of bartacking.)

Cause (1)

156)Tlie

needle

has

scratches,orhas

been

bent or attached improperly.

15-7)

The work

clamp

foot

has

been

positioned

improperly.

15- 8) The

stroke

of the

thread

take-up has

been

maladjusted.

—I

15-9)

The

needle

thread

tensionistoo

higli.

"|—

—I

15-10)

Die

shuttle

does

not

rotate

properly.

16 1) The tension release timing is not

correct.

--|163)

Tlie

moving

knife

has

scratches.

-|163)

Tlie

shuttle

race

spring

has

.scratche.s.

[—

16 ~4) The heightofthe

counter

knife

is not

correct.

16 5) The thread

pathofthe

bottom

surface of the needle hole guide

is

not

smooth.

16

-6)

Tlie thread spreading timing of the

movingknife is bad.

167)Tlie

needle

thread

tensionistoo

high.

|—

17I)The

knives

are

blunt.

[

17 3)

ribrous

wastes remain in the cylinder

«m

cap.

Cause (2)

8)-A

The

strokeofthe

thread

take-up

spring is too large.

8) B The tensionofthe thread take-up

spring is too higli.

10)-A

There

arc

Hbrous

wastesonthe

.shuttle

race racing surface.

10)-B

Poor

lubrication

|

1)-AThreadistiimmcd

before

thread

tensionisreleased.

4)-A

The thread is cut by the projection

of

the moving

knife

before

it is

trimmed

by the moving

knife.

5)AThe

threadiscutbythe

needle

hole

guide.

1> A The moving

knife

or the

counter

knife

have

worn

out.

1

)-B

The moving knife does not engage with the

counter

knife

propcily.

I) -C Tltc moving knife has an improper

vertical

backlash.

I

)-D

The

tiltofthe

eountci

knifeisnot

correct.

3)-

A The

portion

A of llic moving knife has

a

buir.

(Thread is

trimmedinimproper

shape

).

and

thread

waste

remains.)

-51

-

Corrective

measures

Replaceorproperly

attach

the

needle.

—I

Properly

position

the

work

clump

foot.

(RefertoStandard

Adjustment

(8).)

Correct the stroke. (Refer to Standard Adjustment (30).)

Correct

the tension of the thread take-up spring.

(RefertoStandard

Adjustment

(30).)

Correct

the

needle

thread

tension.

\

Remove

the

.shuttle,

and

remove

the

fibioiis

wastes.

|

)

Lubiieatc

the

shuttle

.rssembly,

~|

Correctly adjust the tension release bat. (Refer to Standard Adjustment (11).)

Using a blue polishing sand Ikii or the like, burnish the moving knife with

attention

paidtothe

blade.

Remove

the

scratches.

Correct the heightofthe moving and

counter

knives.

(Refer

to Standard

Adjustment

(17).)

Smooth

out the thread path using a blue polishing sand bur or the like, or

replace the needle hole guide.

Properly position the auxiliary knife driving cam and the moving knife.

(RefertoStandard

Adjustment

(15)

and

(16).)

Correct

the

needle

thread

tension.

I

Replace

the

moving

knifeorcounter

knife.

|

Collect

the heightofthe moving and

counter

knives.

(RefertoStandard

Adjustment

(17).)

Tltc backlash should be 0.05

(0.001")

to 0.1 mm

(0.003")

at the end of the

moving knife. Replace the hinge screw or the moving knife.

Correct

the

tillofthe blade

pointofthe

counter

knife.

(RefertoStandard

Adjustment

(18).)

Buriiushfile moving knife using a blue polisliiiig .sand bar or the like with care

taken to the hladc, or replace the moving knife.

Trouble

18. Inrcrior stitch tishtncs.s

19. Stitching failure in bartacking with

a

synthetic

thread

Cause

(1)

17 3) The moving knife docs not spread the

threads.

Cause (2)

2)-B

The shuttle race spring has a scratch.

(Thread is trimmed in improper

shape , and

thread

waste

remains).

3)-A

The moving knife has been positioned

improperly.

—I

3)-B

The

moving

knife

hasawrong

path.

—]

3)-C

Stop-motion

failure.

|

~r

Corrective

measures

Remove

the

scratch.

Correctly position the moving knife. (Refer to Standard Adjustment (16).)

Replace

the

moving

knifeor the throat plate. (Refer to Standard

Adjustment

(16).)

Refer

to6of

Troubles

and

Corrective

Measures.

[

3) D The shuttle race spring has been

Correct the position of the shuttle racespring. (Refer to Standard Adjustment

positioned

improperly.

(12).)

-| 17-4)

The

last

stitchisskipped.

|—

-|181)

The

feed

timingisbad.

]

18-2)

The

tension

controller

No.2has

been

maladjusted.

18-3)Tlie

tension

controller

No.

2 Is

released.

4) A The timing between the needle and

the

shuttleisbad.

2) A The needle thread tension is not high enough.

18-4)

The

needle

thread

stitches

intersect

with

each

otherasillustrated

below.

vwvw

19

-1)

Thread

breaks

duetoheat

generated.

|—•—|1)A

The

sewing

speedistoo

high

L[

--L

Correct

the timing and clearance

between

the needle and the

shuttle.

(Refer to Standard Adjustment (131.)

Correct the feed cam timing. (Refer to Standard Adjustment (2).)

Increase

the

tension.

1

Correctly

install

the

tension

controller

No.

2 |

Orient the needle to the left by 5 to 10 degree.

Replace the

motor

pulley

with

one

for

synthetic

thread.

1)-BThe

needleistoo

thick.

[

>—[

Replaceitwithathinner

needleorSUPl-lR

needle

for

synthetic

thread.

]

—I

19-2)

Tlireadissplit

finely.

| 12)A

The

thread

paths

are

not

smooth.

[-

-\193)

Tire

starting

stitchisloose.

|

3)-A

flic

feed timing is bad.

-52-

Use

sillcone

lubricant.

Burnish the thread path of each part using a blue polishingsand bar or the

like.

Correct the feed cam timing. (Refer to Standard Adjustment (2).)

(Adjust it to 10 mm

(35/64")

or so.)

Model

LK-1850

Series

Dimensionsoftable

(For

standard)

30(1

A)

Funnel

stopper

'

mounting

hole

(Make

this hole at

time of

setup)

(Note) All

dimensions

arein

millimeter.

(Not

scale)

800

(31 i )

Four leg mounting holes

(Maketheseholes at time setup.)

4—8.5(2

)hole

26'

1A 'Spot facing depth

5.5i»

\

30

(1 A •

hole

(Make

this

hole

onlywhenPtype

is

used.)

30<1A)

hole

51'?

A )spot facing depth 5(a

Mounting

hole

for oil

drain

funnel

564 (Makethisholeat time ofsetup)

i?7a

I200<471)

172

(62

)

130 (B 4

•)

72(28

)

3—8'•A

)hole

(4U)

20

108(41)(C)

(c)

hole

(2

r

sod

ft '

Table

part

No.

13534102

Full

periphery

(1J

)

2 (A ) Full

periphery

10(8)

For Sewing Machine for Attaching Belt Loops

ru

;

(2in

L

171.

Four

leg

mounting

holes

(Make

these

holesattime

setup.)

30(1

ibore

4—8.5(«

)bore

26'.

1ispot

facing

depth55(;

i

51

(?..

(spot facing

depth

5(i;

Mounting

hole

for

oil

drain

funnel

(Make

this

holeattimeofsetup).)\^

3—8('.ihole

Funnel

stopper

mounting

hole

(Make

this

hole

at time of

setup.)

1200(471

)

SlOCil!;

)

30(1.'.

)hole

(Make

this

hole

only

when

P

typeisused.)

(3!

)

Table

part

No.

13545207

30.

s'-'

I P '

v17(2)bore

\(S

) 20(!! ) 20

20

(C )

oa)

90(32)

20

3 )

246

o:;)

>Full140_j2(.^

)Full

peripheryX^

' (il")

periphery

Top

of

Table

2(.'.)

k

(i)

-4

-

•0(2)

(Note) All dlmsnsions are millimeter. (Not scale)

TOKYO

JDKI

INOOSTRiAL

CO..

LTO

Address

Cable Telex

Phone

23-3.

Kabuki-cho'1-chome.

Shinjuku-ku,

Tokyo

160,Japan

JUKI

TOKYO

J22967,

232-2301

03

(205)1188,1189,1190

c

r.

JULY

1983

Printed in Japan(T)

JUKI LK-1852-5, LK-1854-40, LK-1854-10, LK-1854-6, LK-1852-3 Engineer's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual