Juki MH-481 Instruction Manual

MODEL

HIGH

SPEED,

DOUBLE

INDUSTRIAL

WITH

REVERSE

MH-481

FLAT

BED,

SINGLE

CHAINSTITCH

SEWING

MACHINE

FEED

NEEDLE,

Instruction

UUBCI

Book

TOKYO

JOKI

INDUSTRIAL

CO.ITO.

IVIH.481

1. HOW TO

1) How to install

2) Motor pulley and the belt 1

2. HOW TO OPERATE THE MACHINE 2

1) Cautions on operation 2

2) Lubrication 2

3) How to pass the needle thread 4

4) How to pass the looper thread 5

5) The thread tension g

6) Presser

7) On

8) How to install the needle 7

9) How to install the silicon oil lubricant unit g

3.

ADJUSTING

1) Adjusting the presser foot and the feed dog 9

2) On needle bar and needle 20

3)

4)

5)

6)

7) On the

8) On the

4.

MAINTENANCEOFTHE

5.

MALFUNCTIONS

SETUPTHE

Adjusting the oil amount of the face part 3

On oil amount adjusting pin 3

Adjusting the needle thread tension g

Adjusting the looper thread tension g

foot

Adjusting

On presser

On

chain-off

stitch

Adjusting

Adjusting the height of the presser bar 9

How to install the feed dog 9

Matching the needle and the feed dog 9

Adjusting

Matching

Adjusting

Matching

Scooping

Clearance

On

thread

The

and feed dog g

the

foot

length

the

THE

the

the height of the

the needle and the looper 20

the

amount

between

spreader

timingofthread

Positionofthe Methodofthread

Needle

guard

The

timingofthe

Positionofthe

On

looper

thread

position

frame

MACHINE 1

the

oil reservoir 1

pressing pressure g

hand lifter g

thread

presser 7

stitch

length

MACHINE

pressing

looper

pressure

avoiding

of the

needle

motion 20

looper

ofthe

looper

the

looper

and

spreader

thread

spreader

against

latch

spreader

and

loop

guide

needle

guard

needle

guard

looper

guide

cam

of the

take-up

thread

eyelet

MACHINE

AND

CORRECTIVE

CONTENTS

feed

lever

bar 20

the

needle

the

needle

tension

lever

Page

MEASURES

7

9

20

21

j2 ^2

22 22 23

23 12

j2

24

25

1.

HOW

TO

1) Howtoinstall

SET

the

UP

THE

oil reservoir

MACHINE

Operator

2)

Nail

Motor

Rubber

"a

side

pulley

V-belt

pulley"

Oil

and

fl

cushion

reservoir

the

Hinge side

belt

u

As shown in the figure,

reservoir by

grooveofthe

^

Hammer-in

which are

into

®

Leave

as

(D

Puttheoil

the

they

table.

protruded

the 2

are

the4protruded

the 2 front

supporting

washers

and

reservoir

support

partsofthe

rubber

the

head

partofthe table.

on the

with

hinge

ontop.

the oil

washers

nails

side

0 Insert the round felt on top of the rubber

cushion.

MH-481 can sew at a

to

5,500

Accordingly, use a clutch

AC 400W

s.p.m.

(1/2

maximum

HP). Use a V-beltofM

speedofup

motorof3 phase

type.

1

♦The

relation

by the

measured from the

The most appropriate length of the V-beltis42 — 43 inches.

Frequency

following

50

Hz

60

Hz

between

the motor

table.

(The

centerofthe

Numberofrotation

of

machine

5,500

5.000

4,500

5,500

5,000

4,500

effective

V-belt whenitis

s.p.m.

pulley

and the number of rotation of the

diameter

Motor

MTKPOl

MTKP0120000

MTKPOl

MTKPV090000

pulley

- 1 -

of the motor

wound

No.

30000

10000

00000

around

Effective

diameter

motor

the

130

120

1100

100

90

pulley

pulley)

of

pulley

4>

4)

0

machineisshown

means

the

Remarks

diameter

as

2.

HOW

TO

OPERATE

THE

MACHINE

1) Cautions on operation

(I) Do not operate the machinewithout fillingup the oil reservoir with sufficient oil.

(D The direction of the rotation of the machine is toward the operator. Do

in

the

reverse

direction.

not

run the machine

(D The maximum rotational speed of the machine is up to 5,500 s.p.m. but for the first month

drop

this

speedtoabout

After

that,

kindofsewing materialorsewing

2)

Lubrication

run

the

4,500

machine

s.p.m.

with

thread

appropriate

and

capabilityofthe

speed

dependingonthe

operator.

natureofwork,

(D Before running the machine, fill up the

oil

reservoir

with

JUKI

New

Defiix

Oil

No. 1 up to the mark "HIGH".

HIGH

(D Watch and see

go

under

<D

When

the

with

oil,

the

"LOW"

machine

the

that

the oil level does

mark.

is run after

oil

can

be seen splashing

filled

not

up

against the oil sight window when the

oil

circulationisnormal.

(4)

When

the oil

gets

dirty,

replace

fresh, clean oil. Pull

screwinthe be

drained.

oil

reservoir

out

and

the

it with

oil plug

the

oil

can

(D When the machine is to be used for the

first

time

periodoftime,

or whenitwas idle

a speed of 3,500 -

10 minutes

up condition

warmed

with

and

up.

rotate

4,000

the allow

presser

foralong

the

machine

s.p.m. for about

foot

the

in raised

machine to

with

get

Oil sight

TfrwTW^i

wmdow

I

- 2 -

Oil

amount

adjusting pin

Indicating

Needle

Oil

adjusting

^~J^\Arm

_J

Counterweight

•Indicating

point

Crank

Oilisminimum

Crank

III/.11

IS

maximum/

bar

crank

Grooveofeccentric

pin\

|

shaft

Oil adjusting

{

I

screw

Adjusting

the

oil

amountofthe

face

part

When adjusting the oil amount to the needle

bar crank parts, remove the face plate and

adjust by rotating the oil amount adjusting pin at the end of the main shaft.

1. When the indicating point of the adjusting

pin comes near the needle bar crank pin,

the oil

amount

gets less and,

2. When the indicating point comes to the

opposite point of the crank pin, the oil

amount

CAUTION

The oil after adjustment, so have this in mind when

adjusting

On

There is a carved groove on the oil adjusting pin as shown in the flgure.

1. When this groove and the oiling hole of

2. When this groove comes to the opposite

3. The indicating point of the adjusting pin

gets

more.

amount

does

the

oil

amount.

oil

amount

adjusting

the main

amount

side

becomes

shows

shaft

becomes

of

the oiling hole, the oiling

minimum.

the

side

without

not

change immediately

are

matched,

maximum.

the

carved groove.

the oiling

amount

- 3 -

3) Howtopass the needle thread

With the needle bar raised to its highest position, pass the thread in the order as shown in

the figure.

1.

Pass

the

thread

to the

needle

hole

toward

the

side.

opposite

2. Pull out the thread which was passedthrough the needle about 10cm (4").

side

of theoperator

from

the

operator

T~rr

cJ]lU]CSD

- 4 -