Mitsubishi LT2-230, LT2-250 Instruction Manual

MITSUBISHI

INDUSTRIAL

LT2-230.-250

Lockstitch,

Undertrimmer,

Variable

A

SEWING

MACHINE

Model

Class

Double-Needle

Automatic

Speed

INSTRUCTION

MANUAL

-CONTENTS-

PREPARATION

m Power cable

m

Connectionofcontrol

FOR

OPERATION

connection

box

m Adjustment of needle bar stop position 2

CAUTIONS

ON

USE

m Oiling (1) 3

S Oiling (2) 3

[31 Oilingcondition 4 [4] Adjustment of oilingto rotating hook 4

Cautions on operation 4

OPERATION

Installation of needles 5

Winding

Selection of

of bobbin thread 5

thread

Threading of needle threads 6

Adjustment of stitch length and stitch reversing (touch-back) 7

Setting of bobbin 7

Threadingof bobbin threads 8

Tension adjustment of bobbin threads 8

Balance of

Needle

10

Adjustment of presser foot pressure 8

11

Timing between rotating hook motion and needle motion

12

Adjustment of feed dog height 11

13

Relationship between rotating hook motion and take-up lever motion 12

14

Relationship between hook motion and opener motion 12

15

Relationship between needle motion and feed dog motion 13,14

16

Needle bar (left or right) stop operation {LT2-250) 15

17

Relationshipbetweenangle of corner stitching and stitch length 15

18

Installation

19

Adjustment of thread trimmer cam 17

20

Adjustmentofthread

21

Adjustmentofmeshing

22

Sharpening of fixed knife 19

23

Adjustment for change of needle gage 20

24

Wiper

25.

ADJUSTMENT

thread

tension

of movable knife 16

tension

regulator

pressureofmovable

knife

and

fixed

knife

adjustment

AND

OPERATION

OF

CONTROL

UNIT

9,10

1

2

6

8 8

18

19

21

m "1-2 POSITION" select switch operations 22

m

Pedal

m

operation 22

Adjusting

the

pedaling

stitching

forces

speed

22

23

fSl Optional functions 24, 25

CAUTION

26,

27

PREPARATION

• Overall

viewofassembled

sewing

machine

FOR

Touch

OPERATION

Faceplate

back

switch

Phase

reversing

2-type

LIMI-STOP

Balance

\/

_

plug

X

motor

wheel

Synchronizer

Power

Operation

With

this

box,

additional

as

automatic

used.

pushbutton

box

(option)

optional

functions

tackstitch

operation

can

such

be

m Power cable connection

1.

Connector

Each

connector

to

the

corresponding

the

mating

(DFor

installation

backofmotor.

Remove from the

wiresoflamp.

After the connection, be sure to protect the

connected

(3) When lamp is

two

lamp

3.

Power

cable

(The

power

(l)Whenathree-phase

direction.

the

leads.

cable

(plug)

shouldbecompletely

receptacle

of a

work

lamptothe

insulation

lamp

leads

wires

with

not

connectionissameasstand-

tape

and

connect

insulation

used, properly insulate

motorisused,

Control

after

and

tape.

box

set

checking

sew-

insulator

them

connect

Receptacles

machine

Rubber

to

for

cables

cushion

„

rMft

,

Sln%f9h

<btV''

«, .•

jCA

"GND"

terminal

ratingoflOA

and

20A

(3)

The

fuse

that

4.

having a

Directionofrotation

Direction of

end cover (remove the plug, For single-phase

2

min.).

without

for

usedinthe

rotationofthe

three-phase

single-phase

control

ratingof8A.

motor,

operate

fail.

power

motor

turn

source,

source.

box

should

can

be reversed by inverting

it 180° and set to the plug socket again).

the

switch after

Besure to fully set the plug in the socket. _ 1 _

j

Lamp

leads

^

be

the

phase

the

motor

has completely

reversing plug in

stopped

the

(it will take

motor

about

PREPARATION

[2I

Connection

The

control

box

Note:

(1) Be

off

or

disconnecting

(2)

The

heads

panels are specified below. Use

special

combination

machine

panel.

Motor

head

model

LT2-230-M1

LT2-230-B1

LT2-250-M1

LT2-250-B1

[3]

Adjustmentofneedle

When

the

with

However,

pedaliskicked

the

first

if the timing

timing

FOR

OPERATION

of controlbox

shouldbeconnectedasshowntothe

suretoturn

for

combinationofthe

with

the

safety

before

the

care

for

when

headormotor

Control

LD-MD-137

LD-MD-130

bar

downbyheel,

mark

@ onthe

marks

power

the

connectors.

motor

the

replacing

box

stop

deviate

switch

connecting

machine

control

correct

the

control

model

position

the

balance

larger

machine

wheel.

than 3mm, adjust light

right.

Operation

Speed

external

Power

stops

All

source

Clutch

Round

box

setting

VR

Brake

with

sewing

holeintable

Synchronizer

"1-2

select

the

timing

machines

shielding

Operation

Fh

9

Option

POSITION"

switch

mark

(§)

have

positionedinline

been

discposition as

box

Sewing

machine

Presser

foot

factory-adjusted.

follows:

(Preparation

1.

Disconnect

cable

2.

Remove

3.

Run

needleatUP completionofthe

the

(Adjustment)

1. While holding

by

to

with

2.

Repeat

and

sure

times.

3.

Then

from

receptacle.

for

led

from

the

machine

following

one

hand

bring

the

timing

pedaling

heel

down)

the

needle

set

the

adjustment)

the

plug

the

machine

synchronizer

and

position.

preparation,

adjustment:

the

light shielding disc

turn

the

timing

mark

(§).

operation

several

can

stop

plug

(12 pins)

machine

(12

pins) of

head.

cover.

stop

with

After

balance

mark® in

(toe

timestomake

exactlyatall

coming

head

into

the

start

wheel

line

down

the

First

mark

(white)

-2-

timing

Light

shielding

disc

/

CAUTIONS

m

Oiling

Fill

the

Oil level

level is

"H"

level.

For

oil,

Mitsubishi.

Oil

level

ON

USE

(1)

oil

reservoir

shouldbeperiodically

found

use

mark

below

white

with

"L"

spindle

oilupto

checked.

level

replenish

oil

"H"

specified

mark.

If oil

oil

[2]

Oiling

(2)

Whenanew

to

by

time,orsewing

considerably

suitable

by

arrowinthe

sewing

machineisused

machine

long

amountofoiltothe

timeisused

below

figures.

left

again,

portions

for

the

outofuse

replenish

indicated

first

for

a

4

jIjL

:!

j '

LT2-230

Amountofoil

-3

-

..

LT2-250

5 ~ 6

drops

CAUTIONS

[y|

Oiling

ON

condition

USE

See dripping of oil during operation through

the oil sight window to check oiling condition

in

the

machine

(Maintenanceofmotor)

Remove

or

three

with

the

motor

dust

from

months.

filter clogged

might

overheat.)

arm.

Oil

sight

window

the

motor

(If

filter

operationiscontinued

with

lint or

every

dust,

two

the

Q

Adjustmentonoilingtorotating

Dustproof

hook

filter

Cautionsonoperation

(1)When

(2) It

the

foot

work

poweristurned

away

from

shouldbenoted

when

the

pedal.

that

the

powerisinterrupted

on or

brake

off,

power failure occurs during sewing machine

operation.

(3)

Since

malfunction

keep

operation.

(4) Do

dustinthe

the

not

applyamultimetertothe

or

control

box

might

troubles,besure

cover

close

circuit for checking, otherwise voltage of

multimeter

componentsinthe

might

damage

circuit.

semiconductor

may

during

control

keep

not

or

cause

to

OPERATION

[T|

Installationofneedles

Put

each

that

it is

socket

oppositely

needle

stoppedatthe

and

their

prime

set

screws.

until

needle

so

tioned tighten

into

each

needle

turn

grooves

bottom

two

other.

socket

needles

are

Then

posi

Note:

Before

installing

the

needles,besuretoturn

off

the

power.

of

Needles

are

fully

not

inserted.

Needles

wrong

are

set

direction.

in

Windingofbobbin

Adjustment:

•

Tensionofwound

•

Conically

•

Lengthofwound

wound

Position

grooves

each

thread

other.

thread

the

prime

oppositely

• I

()

8

Note: When bobbin thread is wound, keep the presser foot lifted.

Slack

windingisrecommended

Move

the

tighten

tension

length

thread

screw

thread

the

Loosen

and

Thread

adjusting

guide

toward

length

screwtodecrease

Thread

adjusting

guide

for

polyester

smaller

diameterofwound

screwtoincrease

lengthofthread.

thread

Bobbin

filled

drically

threadupto

of

and

lengthofthread

with

b'-bbin

nylon

thread

should

cylin-

wound

capacity.

thread.

layer.

be

80%

-5-

OPERATION

]

Selectionofthread

Itisrecommended

the

left

twist

When

possible, needles.

wellas"Z"

fT)

(1)Pass

needle

threadinthe

discriminate

use

For

Threadingofneedle

each

guide

(§).

Note:

When

threadorfilament

used,

pass

as

well.

(2)

With

the

most

position,

the

order

Note:

Pressing

button

showninthe

saucerofthe

and

the

Needle

thread

(0>

(U

to

(viewed

right

useofneedle

"Z"

bobbin

twist

thread

needle

thin

the

thread

take-up

pass

showninthe

the

upper

thread

(LT2-230)

tension

use

from

needle.

twist

thread,

canbeused.

threads

thread

slippery

thread,

through

lever

each

upper

figure

thread

can

releasing

"S"

twist

front),

threadsisim

thread

in

"S"

twist

through

thread

for

example)

thread

locatedatthe

needle

following

figure.

thread

below

tension

easily

pulled

button

CTTXr

thread

and

"Z"

both

the

thread

(polyester

guide

upper

thread

loosening

opens

the

adjuster,

out.

0

in

as

"S"

'Z"

® (|)

twist

thread

®(D

®

is

in

thread

(LT2-250)

tension

releasing

button

Needle

(^CpCEI)

(ljI)—

Lead

thread

leftward,

(TT)/ 7(See detailed figure.)

(rTT)

the

Lead

the

thread

rightward.

Needle

thread

(See

detailed

figure.)

Needle

Lead

the

Lead

thread

leftward,

-6-

the

thread

rightward.

thread

OPERATION

Adjustment

reversing

Note:

To

the

feed

setting

dialtoa

®

Settingofbobbin

(LT2-230)

(1)

Hold

is

woundinright

the

bobbin

(2)

Pass

the thread through the slit

it.

The

slit (2)

'When

bobbin

catedbyarrowinthe

of stitch length and stitch

(touch

back)

make

stitch

length

reverse

desired

Stitch

setting

the

bobbinsothat

case.

thread

the

should

lever

and

length

dial

Feed

lever

direction

willbeled

bobbin

rotateinthe

smaller,

set

the

position.

I

•

reverse

the

and

threadispulled,

figure.

stitch

bobbin

putitinto

(l)

out

direction

depress

length

thread

and pull

from

indi

•

Touch-back

canbereversedbydepressing

the

Stitching

buttonisheld

direction

goes

when

button

. . .

on in reversed

down,

the

buttonisreleased.

(LT2-230)

Directionofstitching

this

button.

direction

and

returnstoforward

while

Touch-back

button

the

(LT2-250)

Threadinginrotating

and

installationofbobbin

(1)Pass

the

that

side

(2)Then

bobbin

the

thread

(§) of the

pass

the thread in the order from

to (§) inthe figure.

(3)

Match

the

case

with

bobbin

the

with.

protruded

the

and

rotating

thread

the

hook

bin

casetothe

(4)

Set

(5)

Leave

Note:

In LT2-250-BIT,

equipped

hook

(with

case

thread

canbeunwound

through

bobbin.

portionofrotating

recessed

install

case

portion

the

hook

latch

endonthe

thread

aperture

shaft.

hook

lever.

tension

bed.

spring)

slit (1) so

on

the

of

and

bobbin

(5) is

bob

left

(T)

not

- 7 -

Bobbin

Thread

aperture

3-Slit

SSlit

(LT2-250)

case

Spring

0Slit

V

^

Thread

Bobbin

latch

case

lever