Mitsubishi LT2-250 Instruction Manual

MITSUBISHI

Industrial

Technical

Double-Needle

Lockstitch,

Automatic

Machine

Automatic

information

Sewing

Model

Needle

Corner-Stitching

with

Undertrimmer

Machine

LT2-250

(Auto-changer)

Feed,

A

ET-020A

MITSUBI ELECTRiC

MITSUBiSHI

Specifications

CONTENTS

-

Nameofmajor

1 Sewing

parts

machine

head 3

2 Electricals 3

Preparation

• 1 Threading 2

3 Installation

4 Installationofcontrol

5

6

7

8

Operation

1 2 Retracing of

3

4

5 Example of

6

Automatic

1 2

for

operation

Construction

Adjustment

External

SettingofDIP

Power

Adjustmentofneedle bar

for

Setting

Continuous

Compensation

Stitching

corner

Corner Corner

of sewing

with

needle

machine,

thread

of lubricationtothread

of

solenoid-driven presser

panel 7

wiring 7

switchesinthe

cable

connection

stop

automatic

of switches

corner

stitching

and

countersonthe

stitching

single-needle stitching

stitching

corner

stitching

procedure

stitching

stitching Knee stitching Shallow pedal heeling

motor,

and

control

take

up lever 4

foot

lifter

box

panel 4

and

knee switch 5

position 8

control

panel 9

step

patterns

Special

switch

operation

procedure

operation

2

4

7

8

10 10

10

10 11

12 13

Howtouse

1

2

Setting

Howtouse

1 "1—2

Needle

Others

the

bar

DIP

the

POSITION"

2 Adjusting

3

Optional

4 Adjusting

Troubleshooting

sewing

machine

changing

switchesincontrol

control

the

function

the

mechanism

box

select

maximum

pedaling forces

table

head

panel

switch

stitching

operations

speed

14

15

16

18

19

SPECIFICATIONS

•Sewing

Model

machine

Application Max.

speed

spm

Stitch length mm (inch)

Presser

foot

Automatic/manual

Needle

Hook

(for

thread

Bobbin

Lubrication

Compensation

Touchback

Wiper

stroke

trimmer

system

sewing

head

mm

use)

(inch)

LT2-250-M1ATW

Lighttomedium-heavy

3,500

4

(5/32)

DP X5

135

134

Horizontal

hook

with

(with

thread

vention

spring)

Provided

3,000

5

(3/16)

#14,

X 5

#14,

Nm

90

type

standard

bobbincase

slack pre

Aluminum

LT2-250-A1AT

Medium-heavy

3,000

5

(3/16)

9/7

(11/32/9/32)

DP X 5

#16,

135X5#16,

134

Nm

Horizontal

100

type

large-sized

LT2-250-B1AT

Medium-heavy

3,000

6

(15/64)

DP X 5

135

134

hook

with

X 5

(with thread slack prevention spring)

bobbin

Automatic

for

lubrication

Provided

thread

trimmer

Not

use

provided

to

#18,

Nm

110

bobbincase

2,500

7

heavy

(9/32)

Needle gauge mm (inch)

Standard-6.4

(1/4),

Optional-3.2.4.8,8,9.5,12.7

(1/8,3/16,

5/16,

Note: • For feed dog, throat plate, slider plate, bobbin case and bobbin, use those for thread trimmer

application.

• Bobbin

•Applicable

Table

Motor

Control

box

•Auto-Changer

Model

Automatic

presser

foot

lifter

should

Equipment

TLT-A353-T3 TLT-A363-T3

CA-Z402E

Kit

LE-CNA-KM

(Standard)

LE-FM-2

(Electromag

netic type)

be of

good

LE-MDF

quality

TLT-B353-T3 TLT-B363-T3

thatisnot

CB-Z402E

LE-CNA-KA

(Option)

LE-FA

(Pneumatic

type)

deformed.

•Control

Model

Backtacking

Number

corner-stitching

Number

corner

Process

Continuous

single-needle stitching

Panel

of

stitches

return

LE-CNA

4-dial system (Oto 9 stitches),

start

and

0to9

Possible

left

Max.

Possible

for

needles

steps

end

8

stitches

right

3/8,1/2)

and

Control

Knee

panel

switch

LE-CNA

LE-FM-CFT

-1-

NAME

1.

OF

Sewing

(D

MAJOR

machine

d)®

PARTS

head

(D)®®®

®(!l)®

®®

@

1

Solenoid

2 Needle selection solenoid 18 Timini 3 Lever (left) 19 Timing

4 Lever (right)

5 Cam (left) 21 Synch

6

Cam

7

Take-up Touchback

8

9 Compensation stitching switch 25 Rever;

10 Lubricant adjusting screw 26 Timini

11

Crank

12

Needle

13

Oil

14 Pressure.adjusting screw 15 Pressure

Thread

16

(right)

tank

cover

lever

thread

plate

guide

switch

tension

spring

regulator

17

Arm

17

Arm

18 Timing belt pulley (upper)

19

Timing

20

Balanc

20

Balance

21

Synchronizer

22

Arm

22

Arm

23

Revers

23

Reverse-stitch

24

Stitch

24

Stitch

25

Reverse-stitch

26

Timing

27

Lubricator

27

Lubrk

28

Filter

29

Feed

30

Hook

31

Feed

32

Thread

si

shaft

length

rock

shaft

rock

belt

wheel

belt

cam

shaft

trimmer

lever

adjusting

solenoid

pulley

solenoid

dial

(lower)

33

Thread

34

Feed

35

Movable

36

Fixed

37

Bobbin

38

Opener

39

Presser

40

Needle

41 Wiper 42

Needle bar guide

43

Wiper

44

Wiper

45

Presser

46

Face

trimmer

bar

knife

case

foot bar

solenoid switch

foot

plate

cam

lifter

2.

Electricals

©

1 Sewing

machine

2 Needle change solenoid

3

Touchback

4

Compensation

switch

stitching

5 Control panel (LE-CNA)

6

Balance

7

Synchronizer

8

Reverse-stitch

wheel

control

(iD

switch

solenoid

® ® ®

9

Thread

10

Motor

11 Drive

12

Automatic

13

14

15

trimmer

pulley

(LE-FM-2)

Machine

Presser

foot

Option2connector

presser

connector

solenoid

foot

lifter

B>

16

Operation

17

Option1connector

18

Synchronizer

19

Pedal

20

Control

21 Knee

22

Phase

23

Power

box

connector

box

(LE-MDF)

switch

(LE-FM-CFT)

reversing plug

switch

-3-

PREPARATION

FOR

OPERATION

•Construction of sewing machine, motor and control panel

Control

Needle

Selection

Compensation Stitching Switch

Touch

Back

Limi-StopZmotor

Knee

(LE-CNA)

Switch

Panel

Solenoid

Synchronizer

Power

Switch

Automatic

foot

Lifter

Limi-Stop

Control

(LE-MDF)

Box

Presser

Z

Pedal

Thread

1

Threading

Pass only

thread

guide as shown in

For

other

on

page 6ofInstruction

2

Adjustmentoflubricationtothread

with

needle

the

right-hand needle thread through the

thread

the

right figure.

details of threading, refer to

ManualofLT2-230/250.

the

description

takeuplever

Lubrication

adjust

guldeJ^LsC^

screw

Nut

\

To restrict oilingto the takeup leverand needlebar, loosen the nut shown inthe right figureand turn clockwise

the

lubrication

(1) Lubrication adjustscrewfully tightened

(2)

Lubrication

Max. oillingtotakeup

adjust

screw.

screw

returned

lever

Min.

(counter-clockwise)

oilling

to takeup

lever

by 4 turns fromthe fullytightened position

Wood

tall

the

cd

screws. (See

tall

the

icket.

screw

brackettothe

the

knee

switch

table,

right figurt

arm

and

stionofsolenoid-driven

tall

the

solenoid

ng wood screws. (See

move

the

knee

switch

ift

(the

lift

Dadisnot

pressei

brackettothe

the

right

pad

fro

used).

e

knee

PREPARATION

FOR

OPERATION

(3) Loosen

link

spring. Then draw

as

Put

(4)

pass

driven

(5)

Set

the

special

levertothe

showninthe

the

driven

the

knee lift link

crank.

the

knee

bolt

usedtosecure

knee

lift

link

the

knee lift link shaft backward,

right figure.

crankasshowninthe

shaft

lift

link

lever

and

springinthe

shaft

and

through

right

the

remove

figure

the

knee

lift

the

and

hole

(6)

Turn

until

Note: be

the

clockwise

the

Vertical

checked

throat

the

presser

footisabouttolift.

movementofthe

with

the

plate.

stop

screwofknee

feed

dog

presser

positioned

lift

foot

lower

link lever

should

than

(7) Turn the drivencrank to about 25°, as shown in the

right figure (it should be parallel with the drive

crank)

(8) Screw each adjusting rod into

the

and

set

drive

and

screw.

cranks.

secure

it in

that

positionbytightening

the

rod

end

of driven

of

Knee

link

Stop

Knee

link

lift

Shaft

screw

lift

lever

Spring

Screw

Special

bolt

Set

Driven

Set

Screw

crank

Screw

(9) While drawing

other,

secure

Note:

When

make

sure

rubber

(10) Be

Note:

presser

Be

sure

suretoloosen

leversothatitdoes

oil

reservoir

While

the

foot

lifting

that

the

stopper.

when

presser

mechanism.

presser

the

them

securing

drive

the

foot

two

adjusting rods

with

the

rods

crankisin

the

stop

not

come

solenoid

goesupwhen

will

not

rod

clamper.

with

contact

screw of

into

remains

contact

the

knee

contact

still.

the

with

toward

rod

clamper,

with

needles

the

lift link

each

left

the

Set

Driven

stopatDOWN

needlesorneedle

Screw

crank

Rod

position,

socket.

end

/

after

Rubber

Rod

clamper

assembling

stopper

Adjusting

the

automatic

rod

-6-

PREPARATION

4

Installationofcontrol

FOR

OPERATION

panel

Rubber

pad

(1) Install

(2) Plug

the

as

showninthe

control

panel on

right

figure.

the

top

(To install, while lightly holding

panelonthetopofmachine

the

rubber

pads,

tighten

the

needle selection solenoid cord

correspoinding

receptacle

head

screws.)

providedinthe

of machine

down

toslightly

the

control

compress

into

control

head,

panel.

(3) Bind all

showninthe

5

External

Connect

stitch

control

cords

with

right

figure.

wiring

the

automatic

switch,

box,asshowninthe

knee

switch

the

presser

furnished

foot

and

right

lifter,

control

figure.

cord

holder,

compensation

paneltothe

(1) The compensation stitching switch cable should be

connectedto2-pin

(2)

The

knee

connector.

Note:

Before

off

the

power

switch

black

connector.

shouldbeconnectedto2-pin

pluggingorunplugging, be

switch

for

safety.

white

suretoturn

the

as

Cord

holder

Compensation

Control

stitching

Plug (for needle

selection

solenoid)

Screw

panel

(LE-CNA)

f

6

SettingofDIP

Set

the

control

The

delay

position

switchesinthe

DIP

switches

boxto"ON",asshowninthe

control

fully

turned

S4L,

82,

CKD

VR

"PSD"

shouldbesettothe

counter-clockwise.

control

and

64Pinthe

right figure.

box

DO

-I

CO CO

PSU

DELAY

Knee

switch

(LE-FM-CFT)

Clutch

Brake

ON

SWI

-I

CO

PSD

M H

Synchronizer

i

External

volume

SPEED

white

Control

H panel Sewing machine

1—2

position

select

switch

Presser

JL_i

ON

in

(O

Q y • D

SW3

t|SW4

ON

SW5

CO

ON

ggggggBQ

CO

(S o <

gggggggg

9Cq._JC0--_I_IQC

O — UI +

I

(o

CO

Z 55

CO

Automatic

presser

foot

0.

CO CD

g 3 H

C011.CD

lifter

-7-

PREPARATION

7

Power

1.

Connector

Each

connector

the

corresponding receptacle after checking

mating

2.

Lamp

leads

cable

direction.

FOR

OPERATION

connection

(plug) should be completely set to

the

(1) For installation of a work lamp to the sewing

machine,

motor.

Remove

lamp leads and

After

nected

(2)

For

lamp

leads

are

providedatthe

the

insulation

connect

the

connection,besuretoprotect

wires

with

work

lamp, use

tape

themtothe

insulation

that

of 6V 15—20W.

and

tape.

insulator

wires of lamp.

back

from

the

of

the

con

(3) When lamp is not used, properly insulate two lamp

leads.

3.

Power

(The

(1)

When

to

(2) The

power

cable

power

cable

connectionissameasstandard

a three-phase motorisused,

the

black lead. The green lead should be groundedtothe

power

fuse

shouldbethat

source.

connect U

havingarating

clutch

phase

of 1OAfor

to the redlead,V

Lamp

motor

cable

"GND"

three-phase

(3) The fuse used in the control box should be that havinga rating of 8A.

leads

connection.)

phase

to the whitelead,and W

terminal

without

fail.

powersource,and20Afor

phase

single-phase

4.

Direction

Direction of rotation of the motor can be reversed by inverting the phase reversing plug in

cover

For single-phasemotor, operate the switch after the motor has completelystopped (it will take

Be sure to fully set the plug in

8

Adjustmentofneedle

of

(remove

rotation

the

plug,

turn it

bar

180®

the

stop

and

socket.

position

setto the

plug

socket

again).

the

about

motor end

2 min).

When the pedal is kicked down by heel, the machine stops with the timing mark positioned in line with

the

first

timing

mark

(§)onthe

balance

wheel.

All

sewing

machines

have

been

factory-adjusted.

However, if the timing marks deviate larger than 3mm from each to other, adjust light shieldingdisc position

as

follows:

(Preparation for adjustment)

1.

Disconnect

machine

2. Remove

3.

Run

position. After

start

the

head.

the

synchronizer

machine

following

plug

(12

and

the

completion of

adjustment:

pins) of

cover.

stop

with

cable

led

the

needleatUP

the

preparation,

from

the

Light shielding

(Adjustment)

1. While holding

loosen

set

bring

the

© .

After

set

screw.

2.

Repeat

several

exactlyatall

screw

timing

the

pedaling

times

times.

the

light shielding disc by

A

and

turn

the

balance

mark

(|)inline

with

timing

adjustment,besuretotighten

operation

to

make

(toe

sure

down the

and

needle

heel

one

wheel

can

hand,

mark

the

down)

stop

to

First

timing

mark

(white)

3. Then set the plug (12 pins) coming from the machine

head

into

the

receptacle.

disc

OPERATION

FOR

AUTOMATIC

CORNER

STITCHING

1 Settingofswitches and

AUTO-CHANGER

fOWER

START EMD

A B I C 0

3333

START WHO

countersonthe

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JUHOKT

{1)

Set the start

backward stitch

backtacking

"8"

on counter (3) .

"START"

switch

(?) to "ON"

and

set

numberofforward

stitch

"A"

and

(2) Set the end backtacking "END" switch (2) to "ON" and set numberof forwardstitch "C" and backward

stitch "D" on counter (4) .

(3) Setthe

Note:

(4) Set

(5) Set

o

The

When

Note: one

the

number

stitch

stitching.

"CORNER

When

"NUMBER"

numberofthe

all

When

and,

(See

this

preset

SEWING"

switch is

(number of corner stitching steps) within a range from 1 step to 8 steps on

switch (5) to "ON".

"OFF",

are

usual

corner

stitching

completed,

doudle-needle

the

of stitchesto becompleted with

numberofsingle-needle

after

the

fabricisturned,

the

right

figure)

stitchesissetto"0",

double-needle

stitching

stepsisdisplayedbyLED.

counterisresetto"1

single-needle

is possible.

stitching ineachstep on counter (7)

deep

pedal heeling

stitching

immediately

//

' I ^

down

starts

without

Single-needle

stitching

counter

causes single-needle

signle-needle

///

.cT

(6)

Set

the

direction of

(Maximum eight

•

The

directionofturnisdisplayedbyLED

For

leftward

For

rightward

turn

at each end of corner stitching step on

turns

may be set.)

turn

(^

),set

turn ( |l ).set

switch

LEFT/RIGHT

colour

_

SELECTOR switch.

red

LED

will

light.

green

LED

will

light.

OPERATION

FOR

AUTOMATIC

CORNER

STITCHING

2 Retracingofcorner stitching

Every

one depression of the "SUB" switch causes retracing of one corner stitching step.

ced,

be suretocheck

the

position by LED.

step

3 Continuous single-needle stitching

(1)

Set

the

"SINGLE

(2) To-select the left needle or the right needle, set switch .

•To

stop

the

•To

stop

the

(3) Toe down the pedalto start continuous single-needle stitching.

(4)Todisengage

4

Compensation

Compensation stitching is made before starting

stitching,orwhen

ing.

(1) By once depressing

switch,

direction.

(2) By depressing the compensation stitch switch

while

stitch

one

holding

can

NEEDLE"

left

needle, depress switch red LED will flicker.

switch@to

"ON".

right needle, depress switch green LED will flicker.

continuous

single-needle

stitching,

set

the

stitching

corner

one

stitchisaddedincorner

the

stitch

canbeaddedinthe

down

the

be

addedinthe

compensation stitch

touchback

backward

forward

switch,

direction.

stitch

one

switch@to

'

"OFF"

and

When

toe

down

steps are retra

the

pedal.

stitching

Touchback

switch

5 Exampleofcorner stitching patterns

Stitching

NUMBERofcorner

ing

Step

Number of cornersingle-

needle

Corner stitching direction

steps

pattern

stitches

stitch

Stitch

LEFT

Needle

{6.4

mm)

length:

LEFT

gauge

1/4"

3.2

mm

LEFT

RIGHT

Needle

Stitch

gauge

length:

LEFT

1/4"

3.2

LEFT

(6.4

mm

:TT

mm)

RIGHT

57®

(D

LEFT

-10-

OPERATION

6

Stitching

FOR

AUTOMATIC

procedure

CORNER

STITCHING

(Standard

down (1) Shallowly

(2)

(3)

specification Pedal is

for

corner

stitching.)

toe

down

the

foot.

Put

For

toe

fabrics in

start

down

position.

backtacking and double-needle stitching,

the

pedal.

pedal

(4) Corner stitching is accomplished in

(5)

shown

below

(stitching isrepeated for the preset

numberofsteps).

Note:

When

the

pleted,

(5) When

ing is

(6) When

foot

(7)

Remove

present

the

counterIsresetto"V.

the

knee

switchissetto"ON",

done

and

the

knee switch is heldat"ON",

goes

up.

the

fabrics.

numberofstepsiscom

threads

are

trimmed.

deeply

heeled

to

lift

the

presser

the

order

end

backtack

the

presser

~

(1)

Neutral

(2) Shallow

(3) Deep

(4) Shallow heel down (presser

toe

down

(inching)

foot

goes up)

(5) Deep heel down (corner stitching)

Operation

Stitching

Pedal

opera

tion

Stitching

pattern

Note:

If

the

pedal. If

ous

page

(j) Start back

tacking

and

needle

toe

not

stitch

down

turn

dou

off

ble

ing

Pedal

Do

powerIsturned

the

powerIsinterruptedbymistake,

describedtoresume

@

Single-needle

stitching

fixed stitches->Pres-

ser

foot

up.

Pedal

heel

the

power

off

during

with

number

of

goes

deeply.

down

I I

(D

during

corner

double-needle

@

Fabrics

turned-*Press-

er

foot

down.

Continued'

Neutral

corner

stitching,

stitching.

are

goes

stitching.

double-needle

start

and

®

Single-needle

stitching

fixed

number

of

stitches

stitching

continue

with

Pedal

toe

may

Double-needle

stitching

down

not

be resumedbytoeing

End

ing

and

trimming

Knee

switch

"ON"

single-needle stitching as In 3onthe

backtack

thread

down

previ

-11-

AUTOMATIC

CORNER

STITCHING

SPECIAL

OPERATION

PROCEDURE

•Besides

following

1

Corner

(1)

(2)

(3)

the

previously described standard

operation

procedure,

way:

stitching

For

this

operation,

compensation panel

shouldbewiresasshowninthe

Set

the

DIP

the

control

gure.

For

corner

tioninthe

Corner

...

Knee

switch

the

stitch

switches

automatic

switch,

"S4L",

knee

"CKD"

presser

switch

boxto"ON"asshowninthe

stitching,

following

stitching

perform

order:

. . .

Knee

the

switch

following

operation

foot

and

control

right

figure.

and

"64P"

right

operation

...

lifter,

in

fi

opera

Thread trimming . . Deep pedal heeling down switch

Presser

lifter

UP . . .

Shallow

down

pedal

heeling

automatic

ay

CO W

corner

stitching may be made in

Compensation

stitching

white

ON

SW1 SW3

switch

ON

Automatic

foot

rj

CO K ^

CO (O o CO

lifter

presser

8

Q Q Q Q

<s- ^

CO CO

the

Control

«•

Stitching

Pedal

opera

tion

Stitching

pattern

0 Start

tacking

ble

needle

ing

Pedal

toe

back-

and

stitch

down

0

dou

Single-needle

stitching

fixed

number

stitches-♦•Pres

ser

foot

up.

Knee

ON

X!i

with

goes

switch

I I

of

<D

(3) Fabrics are

turned

ser

down.

foot

Continued'

Neutral

Pres

goes

0

Single-needle

stitching

fixed

number

of

stitches

with

Pedal

toe

(D

stitching

down

Double-needle

(D

(I) End backtack-

ing

and

thread

trimming

Pedal

deeply

down

heel

-12-

AUTOMATIC

2

Corner

operation

(1)

The

wiring does

corner

(2)

The

"CKD"

to "ON", as shown in the right figure.

(3) Install

footinthe

(4)

For

corner

tioninthe

Corner

Thread

Presser

tching

CORNER

stitching

stitching.

DIP

switches

and

"64P"inthe

the

foot

figure.

The

stitching, perform

following

stitching . . .

trimming

foot

STITCHING

. . .

not

differ from

Shallow

pedal

that

for

"S4L", "S3L", "S2", "S3",

control

switch (option), as shown in

foot

switchisusedtolift

middleofstitching.

order:

Shallow

down

. .

Knee

liftingatstartofstitching

Knee

shallow

lifting in

the

Foot

box

shouldbeset

the

following

pedal heeling

switch

operation

switch

pedal

operation heeling

middleofshallow

switch

operation

SPECIAL

heeling

standard

the

pres-

opera

or

sti

OPERATION

PROCEDURE

nnnn

Stitching

Pedal

opera tion

Stitching

pattern

(T)

Start back-

tacking

ble

needle

ing

Pedal

toe

and

stitch

down

dou

(2)Single-needle

stitching

fixed stitches

ser

up.

Pedal

heel

number

foot

shallow,

down

with

-^Pres

goes

I I

0

Foot

switch

@

Fabrics

-»•

foot

Continued Neutral

Pres

goes

are

-

turned

ser

of

down.

Single-needle

stitching

fixed of

number

stitches

with

Pedal

toe

^

stitching

down

Double-needle

(§) End backtack-

ing

and

thread

trimming

Knee

switch

"ON'

0

Note:

Foot

switch (LE-CFT-3) Isoptionally available.

-13-

HOW

1

2

TO

USE

THE

SEWING

Needle

•If

•

• If

Others

For

bar

chaning

solenoid

position.

For

and

they

screws;

driving

adjusting

needle

cover

regular double-needle stitching,

right) aretobe

get

outofposition

(§)

arm,

and

the

and

on

adjust

machine

mechanism

bars

check

set

rotary

MACHINE

does

not

go well,

the

cams

for

perpendicularly.

largely,

solenoid

them

body

shaft

correctly.

and

thread

HEAD

remove

their

the

loosen

and

normal

cams

(left

the

(B)

trimmer,

the

set

on

Screw

refertothe

Driving

arm

A

B

(Left)

Rotary

seperate

Driving

solenoid

technical

arm

(Right)

Lever

Cam-right

information

Cam-left

LT2-230/250.

SETTING

As

poses.

For

(1) CSH

(2)

THE

DIP

SWITCHESINCONTROL

the

following DIP switches are provided in

the

reference, all these switches are turned OFF when shipped.

switch

When

turned

When

RTL

When

turned

switch

turned

ON

OFF

ON

OFF

With

the

compensation

tching

pensation

done

low With tching

pensation done

low

Even if

is

corner

it

to

Used

corner

are

ing

If

the

tching

stage.

switch

stitching

continuously

speed.

the

compensation

switch

stitching

stitchbystitchata

speed.

thread

done,

the

stitching

stands

without

the

first

step.

when

more

stitching

appliedtoone

work.

thread

trimmingisdone,

processofcorner

returns

ON,

process

remains

to

PANEL

(LE-CNA)

control panel LE-CNA, utilize

sti

com

can

at

com

can

sti

be

Internal

DIP

switch

a

trimming

of

at

returning

than

one

patterns

stitch

sti

its

first

them

according to

their

pur

-14-

HOW

TO

USE

THE

CONTROL

1

"1—2

POSITION"

Needle stop position can be switched between "1—POSITION"and "2—POSITION" by operating the select

switchonthe

When

is

trimmed

2

Adjusting

1.

Adjusting

switch

the thread trimmer

with

one

the

For setting the

and

the

otheronthe

The variable resistor on the control box panel permits change of the maximum stitching speed within the

range

preset by the other

The

internal

select

panel.

-5

s a-

signal

turnofthe

stitching

maximum

control

variable

BOX (LE-MDF)

switch

• "2—POSITION" NOTE: When automatic corner stitching,

sewing

operations

isONwith the

machine.

"1-POSITION"

"1—2

POSITION" selectswitchset at

the

select

switch

"2-POSITION".

"1—POSITION",

mustbeset

speed

stitching speed

stitching speed, two

box

variable

resistor

"H"

(pedal

fully

panel.

resistor(internal

has

been

factory-adjustedasfollows:

pressed

variable

downby toe)

resistors are provided: one is in the control box,

resistor"H").

at

thread

Internal

2

poles

To

change

be

change.

For

reference,

shown

Whenfine speed setting is required, use a tacho-meter or other suitable instrument.

CAUTION:

(1) Stitching

motor

fnTernarvp'

"M"

(Medium)

die

following.

speed

pulley

(High)

external

two

marks

variable

(2500

faster than that set on the two

diameter

^500

(Low) (Thread trimming)

spm

"T"

over a

4500

spm

resistor

rpm

certain

VR

"H"

setting

3000

spm

setting

range,

and 4500

diameter.

rpm)

Speed setting external VR

the

settingofinternal

are put on the

variable

resistors

External

Max.

speed~250

internal

cannot be

•1-2

» m i X X A I

Tie

•

•••

POSITION"

VR

setting

spm

variable

resistor

"H" must

achievedbyincreasing

select

switch

"H", as

(2)

Adjusting

The

ternal

The

ter-clockwise.

The

edat250

the

positionning

positioning

variable

speed

increases

positioning

spm).

speed

(low

and

corner

(inchingspeed when the pedal ispressed down lightly.)

stitching

speed

(low/

and

corner

resistor

"L".

when

the

speedisadjusted

stitching

variable

resistor

withinarange

speed)

isturned

from

speed)

canbeadjustedbychanging

clockwise,

160

rpm

to320

and

spm

decreases

(it

has

the

when

been

factory-adjust

settingofin

turned

coun

HOW TO USE

THE

CONTROL

BOX

(LE-MDF)

(3) Adjusting

The

wise.

It

has

For change of

dureorconsult

(4) Adjusting

When an optional switch panel, LD-C4, is used for backtacking,

speed)

3

Optional

With DIP switches and optional external connectors, optional function can be appliedtothe

the

thread

trimming

thread

trimming

speed

increases

been

factory-adjustedat200

the

canbesetoninternal

when

the

thread trimming speed adjustment, refer to

with

our

backtacking

function

speed

canbeadjusted

the

variable

service agency.

speed

variable

by changing

resistoristurned

spm.

resistor

"M".

the

settingofinternal variable resistor

clockwise,

and

decreases

the

sewing machine setting up proce

the

backtacking speed (medium

when

turned

clock

sewing machines

for a upright workingand other automatic machines. For further details, pleaseconsult with ashop for sewing

machines.

(1)

DIP

switches.

Set

the

DIP switches refering

descriptions and

S4L:

1

2 SSL: The switchtoforbid lifting of

the

right figures.

The

switchtoforbid commanding

of

high

speed

the

optional

presser

heeling

foot

operation.

to

the

operation

connector

by

shallow

following

through

1.

pedal

the

m

^ CO

to to

, ,

ON

ot

on

SW3

^ ^ ^

to to

co

^ S

yj

3 S4/S3: With this switch ON, the signalof

shallow pedal heeling

comes

outofPin 9 on

nal

connector

1.

operation

the

optio-

4 S4/S2: With this switch ON, the signal of

deep

comes

nal

connector

pedal heeling

out of

1. "

operation

9 on the

optio-

rTTTTTm

s\«4

(O

ON

nnnm

g —i3+

iwwoo

CO

o D

Q.

(oil!S

5 32P/64P: The switch to change over PG

pulse

number

nizer.

Turnitto

LT2 and LU2

6

SH/CKD:

7

ES:

8 8, P,

9 G: Gain switch (Keep it ON)

BR:

10 A: The

11

SH:

12 POS:

With

this

the

optional

(Open collecter

With

this

stop

function.

(For

using

end

position.)

Machine

high

externally)

The

switch

1—2

position (Thread trimming motion)

the

switch

connector

switch

setonthe

64P

type

ON,the

output:

ON,

synchro

side

for

machines.

signalofneedle

2.

max. —10 mA)

a role of

it as ESswitch, turn the

with

automatic

speed

for

switch

one-shot

undertrimmer,

for

upright

function.

the

at the

4 onthe

volume

changing

machines.

lower

position

optional

PSU

connector 2

for timedelaycounterclockwise to the

comes

out of Pin 6 on

changestoemergency

overoftiming.

(Not

necessary

for the

volume

attached

13 US: Needle lifting by the touchback switch.

14 TB: Backsolenoidmotion at thread trimming.

"T".

I-

-16-

HOW

TO

USE

THE

15 16

17

18 19

Internal

(2)

The

MDF

0.05

The

signal of PSU;

andofPSD; at

by sensing

or

the

CONTROL

COR:

IL:

+1

SL

FL:

variable

time

type

~ 3

sec.

machine

like.

Compensation

Releasing of

^

Slow

Releasing of

resisters

delay

volume

machinetoget time delay with range of

stops

delaying by

stop

preferentially at

the

down position, which are input

the

end

of clothing with a

For

reference,

BOX

interlock

start

switch

automatic

is provided

it has

(LE-MDF)

stitching.

within

set

time

the

photo

been

turned

(High

for

thread

presser lifting by

after

up position

terclockwise to the end (min.) at the factory.

(3)

Option

connector

Variousexternal controls can be used by connecting external

For

contacts necessary for input signal, use reliable one.

the

switch

coun

speed

trimming

LE-

the

switch)

82.

SL

+1

Operation

signal

to the option connector.

0

OFF

Time

delay

PSU

Ldelay-J

Delay

1

Needle

ON

OFF

volume

PSD

>\

Stop

time

2

Needles

ON

Power

connector

Option

Stitching

(High speed)

Stitching

(Lowsp^l

Variable

voltage

Amend

Hitching

Needle

"UP"

Speed

change

command

Thread

trimming

Stitching

IMadium

OV

® © (D

Clutch

© ®

Brake

1

9

8

7

6

5

4

3

2

speed)

1

aa.

VCl

VC2

OV

84/Sa/S2

SO

COR

82

81

LOW

Speed

f®®|

Synchronizer

External

VR

llOkn)

Option

1

@(D©

®(HXD

Option

2

One

shot

UP

position

signal

DOWN

position

Slop

Power

supply

UP

position

(thread trimming)

stop

OV 1

/\/\/\

®®®

©®®

®®®

Switch

6

U-CK

5

4

3

2

POSITION"

"6

pane

8H/CED

PSD

+12VMAX

40mA

PSU/ES

OV

Option

©©©

©

®®®

©

Presser

30

+30V

foot

+

foot

—

V

release

trimming

switch

trimming

output

®®@

foot

machine

output

signal

1

2

3

4

12

11

10

9

8

7

6

5

4

3

2

1

2

Pressure Sewing machine

foot

OV

Pressor

signal

Pressor

output

Pressor

output

Sewing

Touchbacic

♦

OV

Touchbacic

+30V

Tension

Thread safety

OV

Thread

output

tWifier

GNO

—0-

—G>

87

"~0"

86

oNo-

—0-

-©•

-i"

Sewing

machine

body

-17-

HOW

TO

USE

THE

CONTROL

BOX

(LE-MDF)

Note: (1) Function of Pin 9 of

with internal DIP switch, preffer to 3

(2) Take care not to drive more than 40 mAfrom 112V power souce of option connector 2.

(4) Reverse

Operation with

4

Adjusting

1. Adjusting Force

changed by chaning position of

to

Note make

malfunction.

2. Adjusting

To adjust, loosen

adjust

be suretotighten

stitch

with

touchback

the

pedaling

the

pedal pressing

necessary to pressing

the

lever.

that

too

faint

variable

the

pedal kicking back force

spring pressure.

touchback

forces

pedal pressing

lever

stop

nut

"A"

the

nut

option

connector

1 and Pin 2, 6 of

(1)'

(S7) Is applicable only during running.

down

force

down

the

pedal

can

be

the

spring

hooked

down

force

may

position,

and turn bolt

After

"A".

resulting in

the

adjustment,

"B"

to

option

'DECREASE

connector

INCREASE.

2 are changed over

Lever

TROUBLESHOOTING

TABLE

Item

A

B

C

D

Trouble

The

motor

does

at

all

while

Is

turnedon(buzz

not

heard).

The

sewing

though

control

the

leverisnot

operated.

The

sewing

does

not

runatail.

The

motor

reverse

direction.

not

the

power

is

machine

motor

machine

runsinthe

run

runs

The

motorisnot

with

the

Motor

windingisopen.

Control

The

pedal

its lever

andS1is

Clutch disconnected.

are

connector

Cause

fed

power

supply.

boxistrouble.

switch

and

misaligned

not

actuated.

is

—

1. Check

supply

2. Check

switch

reversing plug

contact

Replace

Adjust

and

Check

the

its

lever.

the

setting.

Remove

the

plug,turn it

again.

Remedy

the

power

connection.

the

power

and

phase

for

condition.

motor.

control

pedal switch

clutch

connector

phase reversing

180®

and set

box.

Refer

7

on

page 8.

7

on

page

4

on

page

7 on page 8.

to

8.

18.

E

Needle

does

not

stop

at

The

pedal

switch

and

its

Adjust

the

pedal switch

DOWN

F

The

not

after

innertia.

G

The

stops

UP

H

The

be

by

position.

sewing machine is

braked,

sewing

running

with

but

with

machine

needle

stops

position.

pedal

switch

cannot

fully

pressed

down

toe.

lever

are

misaligned

S1

remains

closed.

Synchronizer

trouble.

Brake

does

not

82isclosed.

at

Position

at

•!-£•

switchisset

position.

Synchronizerisinstalled

improperly.

Stopper

and

are misaligned.

is

work.

pedal

and

switch

its

lever.

Replace

1.

Check

connector.

the

2. Replace

Adjust

the

and/or

its

lever.

Set

the

position

^

position.

Adjust

positionofthe

synchronizer.

Properly align

and

pedal

switch.

synchronizer.

brake

the

control

pedal

switch

the

switch

stopper

and

box.

to

4 on page 18.

8 on page 8.

4 on page 18.

1

on

page

15.

8 on page 8.

4 on page 18.

-19-

Item

Refer

Trouble

1

The

motor

runs

faintly

and

stops.

Single-phase

Cause

operation.

Check

line

and

Remedy

the

power

(particularly,

plug).

supply

switch

to

Needlesdonot

J

the

times.

Corner

K

Impossible (Inching

Is Impossible).

L

Single

Is Impossible.

same

positionatall

stitching

needle

stop

Is

stitching

VRInthe

at

Is

not

Brake gap is wide.

Lever

function.

DIP

control

Improperly.

Corner

is

not

Step

"9".

The

operation

defective.

The

defective.

control

properly

switch

switchesInthe

box

are

set.

does

set

stitching

close.

settingIs"0"

control

boxorthe

panel is

operation

paneni

box

not

switch

or

Properly

control

Correct

Check

lever.

Set

set

box.

the

alignmentofthe

the

DIP

properlybyfollowing the

right

column.

Close

the

corner

switch.

Properly

set

steps).

Is

Replace

or

Replace

the

operation

the

VR In

gap.

switches

stitching

the

steps(1—8

control

panel.

operation

box

the

panel

2

on

page

15.

4 on page 18.

6

on

page 7.

( 1 on page 12

2 on page 13.)

1

on

page 9.

1 on page 9.

and

M

N

0

Corner

stitching

not

stop.

Automatic

foot

lifter

work.

Double

does

not

when

corner

Is

completed.

presser

does

needle

occur

does

not

stitching

even

stitching

ConnectorIsdis

connected.

Needle

select

Is misaligned.

Synchronizer

trouble.

ConnectorIsdis

connected.

Automatic

lifter

presser

mechanismIsmis

aligned.

DIP

switch

S3Lisset

"ON".

Needle

select

is

misaligned.

The

operation

trouble.

mechanism

Is

foot

solenoid

panel

at

Is

Check

the

Adjust

mechanism.

Replace

chronizer.

Check

the

Adjust

Set

the

Align

the

Replace

panel.

connector.

the

needle

the

syn

connector.

the

mechanism.

S3Lto

solenoid.

the

operation

select

"OFF".

5 on page 7.

1 on page 14.

5

on

page 7.

3 on page 16.

1 on page 14.

-20-

Item

Q

P

Single needle

occurs

through

stitchingiscompleted.

The

sewing

does

not

needlesatUP position, but

goes on running.

R

The

presser

not

goesupafter

needles

sition.

Trouble

operation

corner

machine

stop

with

foot

stopatUP

the

does

the

po

Cause

Needle

select

does

not

returntothe

original

position.

Synchronizer

trouble.

Refertothe

at

item

N.

Operation

trouble.

solenoid

is

description

panel

is

Align

solenoid.

Replace

panel.

Remedy

the

needle select

the

synchronizer.

operation

Refer

to

1

on

page 14.

8 on page 8.

While

S

stitches

select

changed,

ing

correspondingly

Pedal heeling

T

heavy.

does

number

and

setting

corner

not

of

needle

are

down

stitch

change.

is

Operation

trouble.

Pedal

switch

not

properly

panel

lever

adjusted.

is

part

is

Replace panel.

the

operation

4 on page 18.

-21-

(8505)

ROD

A

PrintedinJapan

MITSUBISHI

HCAO

OmCE:MfTSUBISKI

ELECTRIC

DENKI

BLOG.MARUNOUqKI.

CORPORATION

TOKYO

100

laEX:

J24S32

CABLE

MaCO

TOKYO

Mitsubishi LT2-250 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual