Mitsubishi LS2-1180 User Manual

MITSUBISHI

Industrial

TECHNICAL

Automatic

Model

LS2-1180

Sewing

INFCRMATION

Undertrimmer,

Machine

Single-Needle

Lookstitch

A

ET-035

ELECTRIC

MITSUBISHI,

1.

SPECIFICATIONS

2.

THREAD

2.1

Electric

2.2

Machine

2.3

Machine

3.

PREPARATIONS

3.1

InstallationofSewing

3.2

Adjustment

3.2.1

3.2.2

3.2.3

TRIMMER

Adjustof"UP"

Adjustof"DOWN"

Comfirm

into

4.

ADJUSTMENTS

4.1

HowtoAdjust

4.2

Thread

4.2.1

4.2.2

4.2.3

4.2.4

4.2.5

4.2.6

4.2.7

4.2.8

4.2.9

4.3

AdjustmentofNeedle

4.4

Cautions

4.5

Touch-Back

4.6

Wiper

4.6.1

4.6.2

4.7

Adjustment

4.8

AdjustmentofFeed

4.9

TimingofFeed

4.10

Hook,

Trimmer

Construction

Cautions

Installation

Connectionofknife

Knife

Installation Installation

Adjustment

Adjustmentofneedle

Heightofwiper

Wiper

Bobbin

Section

Head

the

driving

on

SYSTEM

Section

BEFORE

of

Machine

the

receptacle

Timing

Mechanism

on

adjustment

of

of of

of

Installation

Pushbutton

operation

of

Forward

Case,

CONTENTS

(1) 4

(2) 5

OPERATION

Machine

Stop

and

Position

Motor

position

stop

knife

shaft

thread thread

knife

operation

between

base

and

trimmer trimmer

engagement

Thread

of

Touch-Back

then

Needle

and

Remaining

the

and

fixed

knife

parts

solenoid

cam

tension

Solenoid

plug

(12 pins)

coming

from

the

machine

head

Hook 7

blade

bracket

driving

unit

releasing

unit

crank

amount

Length

7-14

position

and

Reverse

Stitch

Lengths

Dog Inclination 13

and

Bobbin

2

3-5

3

6-7

6

7 7

7

8

9 9

10 10

11

12 12

13

13 13

14

5.

TROUBLESHOOTING

15

1.

SPECIHCATIONS

item ^

Material

Max.

sewing

Stitch

Needle

Presser

(Knee

length,

bar

foot

lifter/Manual)

Needle

Hook

Bobbin

Thread

weight speed,

stroke,

case

trimmer

mm

Model

spm

mm

LS2-1180-LiT

Light

4300

29.0

11/4

DA X

1#11

Standard

Made

of

aluminum

thread

trimmer

Rotary

for

scissoring

LS2-1180-MIT

Lighttomedium

0to4

DB X

(for

thread

Standard

Madeofsteel,

by

LS2-1180-MITW

5000

31.8

11/5

1-2#14

trimmer)

for

left

movable

thread

knife

LS2-1180-HIT

3500

33.0

DB X

Heavy

[forthread]

1 trimmer >

Heavy

trimmer

and

right

LS2-1180-BiT

Heavy

0to7

1#22

Heavy (Large)

[forthread)

' trimmer J

steel

trimmer, large

fixed

blade

3000

35.0

13/5

Large

Made

for

of

thread

Thread

trimmer

Knife

drive

Touch-back

Wiper

Oil

starting

Solenoid

Cam

actuation

drive

O

—

o

MC70M

2.

2.1

THREAD

Electric

TRIMMER

Section

SYSTEM

Part

Names

(T)

Sewing

®

Balance

(7)

Wiper

@

Machine

@

Detector

(iB)

Operation box

machine

wheel

solenoid

cord

plug plug

(2) Touch

(5) Synchronizer

(§)

Motor

@

Control

@

Pedal

switch

box

(3)

Back

solenoid

(e) Thread trimmersolenoid

(9)

Drive

@

Operation

®

POWER

pulley

ON/OFF

box

cord

plug

pushbutton

2.2

Machine

Head

Section

(1)

Thread

trimming

mechanism

Part

Names

(?)

Thread

(4) Pedestal

(7)

Knife

®

Stopper

®

Knife

@

Driving

tension

driving

base

(left)

lever

release

crank

©Flexible ©Movable ©Cam

follower

©Fixed

@

Knife

driving

©Thread

wire

knife

blade

trimmer

(left)

crank

bracket

shaft

solenoid

(1)

©

Needle

©

Fixed

©Cam

®

Link

©Coil

follower

spring

bar

connecting

blade

crank

(2)

link

guide

2.3

Machine

Head

Section

(2)

Touch

back

mechanism

@

-Ql)

Part

Names

®

Cover

(4)Coil spring

@Pin

@

Micro

switch

@Side @

@

<§)

cover

Bushing

Reverse

Spring

sewing

bracket

crank

(D

Switch

(5)

Link

@Wiper

(n)

Pushbutton

@

Plunger

(g)

Feed

regulator

@

Reverse

(||)Solenoid

cam

sewing

mounting

lever

@

(e) Wiperbracket

(9)Switch bracket

(g)

@ @

(|l)For

bracket

Wiper

Back

Link

Spring

reverse

solenoid

bracket

sewing

3.

PREPARATIONS

3.1

InstallationofSewing

BEFORE

Machine

OPERATION

and

Motor

n

=—1

f\=\

^

1—»

^

i (

I

1—

•^1

I I

Operation

HI

k

fog

n

Operation

box

(option)

Pully

^Belt

•—

Power

push

button

•Receptacles for

Control box Round hole in table

box (option)

machine

cords

Passing

the

Machine

cords

Wiring between sewing machine

A/ote:

Before plugging or unplugging, be sure to turn

Pass two cables from the sewing machine through the

plugs

into

the

respective

and

control box

plug

receptacles.

Rubber

cup

Detector

Connectors

locationonthe

ddOIIdD

External

knob

off

the POWER ON/OFF pushbutton.

round

hole in the table

1-2 position

Operation

control

select

and

Machine

box

switch

connect

the two

3.2

Adjustment

3.2.1

Adjustof"UP"

of

Machine

position

Stop

Position

When

machine

deviate

(1)

Disconnect

the

(2) Run

(3) While

tool"

3.2.2

Adjustof"DOWN"

When "DOWN"

than3mm

(1) Disconnect

the

(2) Run

tion.

the

pedal

stops

larger

at

than3mm

the

machine

the

head.

machine

holding

in

the

hole

the

pedalisNewtral

position.Ifthe

adjustasfollows.

the

machine

the

head.

machine

is kicked

"UP"

down

by heel,

position.Ifthe adjustasfollows.

plug (12 pins)ofcable

and

stop

at "UP" position.

the

pully

insert

the

then

remove

the

position

the

machine

marks

plug (12 pins) of

and

stopat"DOWN"

deviate

cable

the

marks

from

"adjusting

tool.

stops

as

larger

from

posi

3rd

mark

AFTER

Rotating

1st

Adjusting tool

BEFORE

direction

mark

(3) While

3.2.3

Comfirm

pins)

receptacle.

4.

ADJUSTMENTS

4.1

HowtoAdjust

The

holding

the

pully

insert

the

"adjusting

tool" inthe hole (®, then remove the tool.

the

stop

coming

standard

Item

Needle

lowest

Distance

needle

Distance

hook

Distance needle

positionofneedle

timing

^^

lift-up

position

between

hole

and

between needle and ^

point

between

plate

setting

from

the

Timing

quantity

upper

hook

needle

base,inhighest

bar

operation

the

between

Sub>cl8ss

from

side

point

then

machine

between

needle

^

of^

0-0.2

^

and

-L

1.8

0.05

17.3

the

head

Needle

and

0.05

18.8

plug

into

and

hook

•M

2.0

—

(12

the

Hook

is following

(mm)

-B

1.8

—

0.05

18.8

•H

1.8

—

0.05

20.6

the

Timing

table.

®E]

mark

h

Arm

1st

3rd

mark

"Down"

U

"Up"

position

Fig.1

4.2

Thread

Trimmer

Mechanism

4.2.1

4.2.2

A

Construction

Fixed

blade

bracket

Thread

guide

Fixed

blade

Movable

knife

Knife

Cautionsonadjustment

hook

shaft

cam

systemisutilized

unit

(left)

driving

crank

Knife

Coil

Knife

for the

base

spring

driving

unit

Thread

shaft

Cam

thread

Thread

twist

spring

trimmer

follower

Fig. 2 Cam follower crank (2)

trimmer

crank

cam

(1)

drive.

trimmer

solenoid

Thread

Therefore,

trimmer

during

solenoid

Flexible

twist

the

unit|'

wire

spring

adjustment

of

sewing machine, if the sewing machine is rotated one turn with the thread trimmer solenoid in the

operating

knife

state

state (the

makes

only

contact

duringanormal

rollerofcam

with

the

needle,

thread

follower

crank

(2)isengaged

with

resultingindamage.Besuretobring

trimming

cycle

(Needle

DOWN

the threadtrimmer

the

solenoid

positiontoUP

cam),

into

position).

the

operating

movable

4.2.3

4.2.3.1

(1) As shown in Fig. 3, fit the knife base unit to

4.2.3.2

Installation

Knife

hook

Fixed

of

knife

base

unit

shaft

bushing (left) and fix with

blade

bracket

unit

and

fixed

blade

the

bracket

the

screws

(1) As shown in Fig. 4, install the fixed blade bracket

unit with the hook positioner dismounted, and

then

fix

with

the

screws

® .

unit

Knife

Rg.3

base

unit

inlt /

Hook

Fixed

shaft

blade

bushing

bracket

(left)

unit

Fig. 4

8

4.2.3.3 Relation between fixed blade

(1) Fig. 5

shows

the

standard

state.

and

movable knife (left) edge

0.3

mm

Movable

knife

(left)

(2) If

the

dimension

indicated

in Fig. 5 is

too

three-thread breakage will occur, leadingtoneedle

thread

Reversely, if

trimming

be

(3) Make

cast-off, etc.

exercised.

the

after

the

dimension is

error

may result. Therefore,

adjustment in (2) in

the

thread

too

small, thread

caution

the

installation

trimming.

procedure of fixed blade bracket unit or in

installation

4.2.4

Connectionofknife

(1) Make

use

care

sewing

procedureoffixed blade.

base

connectionasshown

for

the

position

machine

model.

and

knife

in Fig. 6.

of

link

driving

At

depends

this

large,

must

crank

time,

on

the

(Knife

Fixed

edge).

blade'

LS2-1180-LIT

LS2-1180-MiT

LS2-1180-HIT

Link

•j-r

/

o o

Rg.5

LS2-1180-BIT

Rg.6

4.2.5

Knife

driving

Knife

(1) Fig. 7 shows

driving

shaft

and

spring.

crank

the

standard setting position.

,\

\

Bushing

(BIT:

90.5

(2) During assembling, be suretopass

parts

Cam

follovwer

c;

mm

87.5

mm)

the

knife driving shaft through

crank

\ Cam follower

^

(1)

[rf

Cjyr

Knife'driving shaft

Rg.7

crank

Stopper

(2)

the

knife driving crank first.

(3) Fix the cam follower crank (1) to the recess of knife driving shaftatthe position shown in Fig. 7.

(4) Fix the stopper to the

axial

direction.

recess

so that the knife

driving

shaft can rotate smoothly without playin the

4.2.6

(1) Operation

Installationofthread

®

Standard

@

Adjust

trimmer

strokeofthread

operation

the

operation

strokeis6.0

solenoid

trimmer

unit

solenoid

mm.

strokebyuseofthe

nut

@.

cam

follower

Driving

lever

crank(2)

6

mm

Solenoid mounting

bracket

o

(2)

Installationofunit

(T)

Install

Fig. 8.

©

Install

provided between

crank

the

solenoid.

©

When

clearanceof0.5

follower cranks (1) and (2) as shown in Fig. 9. This

is the standard installation status. Make adjustment

by moving

arrow

4.2.7

(1)

Installation

Align

matching

the

unit

with

the

the unit so that

the

(2)

with

the stopper nut (g) incontact

the

solenoidisenergized

mm is provided between

the

solenoid mounting bracket in

direction

second

markonthe

of

in Fig. 8

thread

timing

trimmer

arm.

screws

(B)

approximately

driving lever

under

cam

mark

@ on the

and©shown

1

mm

and

cam follower

this

condition,

the

pulley

in

with

cam

the

with

Fig. 8

is

Cam

follower

crank

0.5inm

(2)

(1)

Matching

Rg.9

mark

the

(2)

Set the thread trimmer solenoid to the operation state and

turn the thread trimmer cam forward. At the point where

the

cam makes contact with

(3) When

the

and

the

clearance between

Thread

trimmer

operationofthread

cam follower crank (2) has returned,

the

cam

the

roller, fix

trimmer

cam and roller

the

cam.

solenoid has been reset

the

endis0.5to1.0

Thread

trimmer

Roller

I

J

Fig.

10

standard

mm.

cam.

Thread

trimmer

m

cam

0.5to1.0

Roller

'~i\

Cam

(w

mm

follower

crank

Note: Thestandard position of cam follower crank (2)prior

to the operation is shown in

position has been

the stopper plate, make adjustment

screw

4.2.8

Adjustmentofknife engagement

(Fig.7)and

changed,

then

make

Fig.

for

example,

adjustment in

11.

with

When

by

removing

the adjust

(1)to(3).

(1) Positionsof movable knife (left) and fixed blade

®

Fig.12shows

the

standard

state.

this

Camfollower shaft

crank

(2)

Movable

knife

LS2-1180-BIT

2

mm

Hook

shaft

/

Roller

knife

driving

7

nini

(left)

(riT'

V * ' 1

\ 7.5

mm)

Fig. 11

I

\

LS2-1180-LIT

LS2-1180-MIT

LS2-1180-HIT

2

Fixed

blade

mm.

/

i ^

Sii

(2) Adjustment of knife engagement

®

Set

the

solenoid

sewing

by the

has moved

amountis1.5to2.0

®

Make

machine.

thread

adjustmentbythe

Then, the

trimmer

to

the

to the

maximum,

mm.

amount

operation

movable

cam.

When

the

See

Fig. 13.

installationofknife

(3) Adjustment of knife engagement pressure

0

The

standard

knife

engaging

pressureisobtained

movable knife (left) and fixed blade start making contact

with each other at the position shown in Fig. 14.

(2)

When

cutting

actionispoor

especially

thread, a slight increase of the engagement pressure

produces an effect.

state

and

rotate

knife

(left)

is rotated

the

movable

standard engagement

knife

driving

crank.

when

becauseofthick

the

(left)

the

Movable

Knife

knife

driving

1.5to2.0

(left)

crank

Rg.

p«-

Rg.

mm

12

Fixed

blade

13

3

mm

0

To

adjust

in

Fig.11and

the

engagement

adjust

with

pressure,

the

adjust

loosen

screw

the

(§).

lock

11

nut

(S)

Fixed

blade

Rg.

14

4.2.9 Adjustment of needle thread tension releasing

amount

Thread

trimmer

solenoid

(1) Make

(2)Tomake

CAUTION

4.3

adjustmentsothat

operated,

approximately1mm.

the

tension discs

adjustment,

wire.

If

the

opening

thread

thread too

leadingtoloose

AdjustmentofNeedle Thread Remaining Length

will

cast-off. Reversely, if

large,

be

the

of

trimmed

tension

stitches.

loosen

tension

at

discs are

when

the

of

thread

the nuts@

discs is

short

the

openingoftension left

thread

too

length, leadingtoneedle

opened

trimmer

tension regulator

and

move

small,

continuously,

solenoid is

the

needle

discs is

open

flexible

(1) Adjust the remaining length of needle thread by use of the

pretension

Clockwise

wise

turn

adjust

nut @.

turn reduces the remaining length. Counterclock

increases

the

length.

1mm1

mm

Fig. 15

Flexible

wire

4.4

Cautions

on

InstallationofTouch-Back

Solenoid

Adjust the position of solenoid in the longitudinal direction so

that

the

plunger of solenoid and the link (for connection) are

twisted, and make sure

that

the reverse sewing lever moves

not

smoothly in the vertical direction. After that, tighten the

mounting

4.5

Touch-Back

screws.

See

Fig. 17.

Pushbutton

Thefunction of pushbutton can be eliminated as required.

(1)

Normally,

Fig.

this pushbutton is

18.

When

the

sewing

used

at the position

machine

shown

is operated after the

in

pushbutton ispressed, reverse stitching isperformed.

Rg.

16

Feed

17

-V

regulating

Solenoid

lever

(2)

When

the

it is

the

pushbuttonismoved

broken line in Fig. 18,

pressed.

the

switch does

to the

position

not

function even if

indicated

12

by

Fig. 18

4.6

Wiper

4.6.1

Heightofwiper

(1)

The

standard

whichIsstoppedatthe

(2)

Make

adjustment

4.6.2 Wiper

(1)

The the

fully

(2)

To

adjust

operation

standard

center

pushed

make

the

of

(when

adjustment,

mounting

heightofwiper

UP

position.

after

loosening

position

operation

needle

positionofwiper

when

the

solenoid

loosen

positionofsolenoid

is 2 mm

the

is energized).

the

below

screw

plungerofwiper

screws

the

tipofneedle

®.

is 0to2 mm

solenoid

(B)

and © and then

unit.

from

2

mm

Wiper

solenoid

is

0to2

mm

unit

plunger

4.7

Adjustment

(1)

Loosen

the

eccentric shaft (§).

length

wise reverse

4.8

Adjustment

(1)

To turn the

tilt.

and

turn

stitch

adjust

eccentric

Counterclockwise

of

Forward

screw

®

Clockwise

increases

length.

of

Feed

the

inclinationoffeed

the

Dog

and

Reverse

and

make

reverse

forward

Inclination

®.

Clockwise

turn

setstoupward

adjustment

turn

stitch

dog,

Stitch

reduces

length.

length

loosen

turn

Lengths

by

turning

the forward stitch

Counterclock

and

decreases

the

screw

® and

setstodownward

tilt.

the

0

Rg.

19

20

13

Rg.

21

4.9

TimingofFeed

(1)

The

position

tip

is located approximately 3 mm below

needle

and

the

needle

plate

teeth

plate.

for

when

of

See

the

Fig. 22.

(2) Make adjustment by

standard feed timing is where

the

feed

dogissunk

dog

align

the

mounting positions of feed cam.

with

by

the

turning

top

upper

the

needle

surface of

the

pulley

surface

of

Needle

plate

Feed

dog

Rubber

cap

Needle

^

Timming

mark

3

mm

To install, timing mark on a feed ing hole on a

4.10

Hook,

(1) Use

guide

Bobbin

the

slit @asshowninFig.

upper

undertrimmer

Case,

shaft, by

and

Bobbin

hook

cam

Is according with oil

set

screwasshown

which

has

24.

the

in Fig. 23.

bobbin

thread

Set

screw

Fig. 23

Fig.

24

Oiling

hole

(2) Use

@ at the

(3)

For

bin

order

as

the

bobbin

case

bottomasshowninFig.

the

bobbin,

of

Model -L

to

prevent

lightlyaspossible.

use

sewing

the

which

the

has

attached

machine

deformation

idel

running

25.

bobbin.

is

made

of

bobbin,

prevention

The

standard

of

aluminum.

wind

the

spring

bob

thread

In

Rg.

25

14

5.

TROUBLESHOOTING

Trouble

Thread

med.

Neeedle outofthe

cannot

thread

needleatthe

startofstitching.

be

trim

comes

Cause

Knife

engagementisimproper.

Knife engaging pressure is

Damage

of

Machine

Positionoffixed

Since

operated cannot

At

thread

open.

and/or

movable

stops

stop

the

be

the

time

tension

wearofcutting

knife

(left),

too

early.

position

bladeisimproper.

movable

too

early,

performed

of

thread

regulator discs do

varies largely.

knife

loop

by

too

fixed

(left)

spreading

the

trimming,

low.

edge

blade

knife.

not

is

Adjust

Change

Adjust

1.

2.Inthe

Adjust

trimmer

Adjust releasing.

Corrective

the

engaging pressure.

the

stop

Check

needle

timeofthread

the

cam.

the

case

check

pulley

position

installation

needle

machine,

(motor

boxGswitch

Action

engagement

knife

and/or

position.

thread

tensionatthe

trimming.

of

Model

table

specifications

diameter,

ON).

of fixed blade.

thread

amount.

-H

control

of

tension

blade.

or

thread

Reference

Section

4.1.8

3.2

4.1.9

-B

4.1.3

4.1.7

4.1.9

Skip

stitchatthe

stitching

Needle

after

threadistoo

thread

trimming.

start

Thread

trimmer

Threadistrimmedbythe

before

knife

the

(left) engage

blade.

Needleistoo

thread.

Pretensionistoo

of

Bobbin

the thread

thread

idle

trimming.

Tensionofbobbin

The

remaining length

thread

on

after

thread

Pretensionistoo

long

Thread

and

smooth.

trimmer

movement

the

cutting

running

the

needle

trimming.

hook

timingistoo

edgeofmovable

with

thick

with

strong.

becomes

short

of

bobbinatthe

threadistoo

sideistoo

weak.

timingistoo

between

positioner

fixed

the

respect

of

the

early.

blade

fixed

due

high.

needle

short

late.

hook

is

not

to

Adjust

trimmer

Adjust

the

Use a

bobbin

prevention

Adjust

the

1.

Adjust

2.

Check trimmer

3.

Check

Adjust

the

Adjust

trimmer

the

installation

cam.

the

positionoffixed

pretension.

case

spring.

tensionofbobbin

the

pretension.

the

installation

cam.

the

thread

pretension.

the

installation

cam.

with

of

idle

contact

of

running

thread.

of

thread

blade.

thread

area.

thread

4.1.7

4.1.3

4.2

4.9

4.2

4.1.7

4.2

4.1.7

15

A

(9008) MEE Specifications subiject to change without notice.

MITSUBISHI

HEAD

OFFICE:

MITSUBISHI

NAGOYA

ELECTRIC

OENKIBLOG

WORKS:1-14.YAOA-MINAMI

MARUNOUCHI

CORPORATION

TOKYO

100

TELEX:

J24532

CABLE

5 .

KIGASKI-KU

. NAGOYA .

JAPAN

MELCO

TOKYO

New

publication,

effective

Jul.

1990.