Mitsubishi LS2-1180 Manuel

MITSUBISHI

Industrial

Sewing

Machine

TECHNICAL

INFCRMATION

Automatic

Undertrimmer,

Single-Needle

Lookstitch

Model

LS2-1180

ET-035

MITSUBISHI,

ELECTRIC

From the library of: Superior Sewing Machine & Supply LLC

CONTENTS

SPECIFICATIONS

THREAD

TRIMMER

SYSTEM

3-5

2.1

Electric

Section

2.2

Machine

Head

Section

(1) 4

2.3

Machine

Head

Section

(2) 5

PREPARATIONS

BEFORE

OPERATION

6-7

3.1

Installation

Sewing

Machine

and

Motor

3.2

Adjustment

Machine

Stop

Position

3.2.1

Adjust

"UP"

position

3.2.2

Adjust

"DOWN"

position

3.2.3

Comfirm

the

stop

operation

then

the

plug

(12 pins)

coming

from

the

machine

head

into

the

receptacle

ADJUSTMENTS

7-14

4.1

How

Adjust

Timing

between

Needle

and

Hook 7

4.2

Thread

Trimmer

Mechanism

4.2.1

Construction

4.2.2

Cautions

adjustment

4.2.3

Installation

knife

base

and

fixed

blade

bracket

unit

4.2.4

Connection

knife

base

and

knife

driving

crank

4.2.5

Knife

driving

shaft

and

parts

4.2.6

Installation

thread

trimmer

solenoid

unit

4.2.7

Installation

thread

trimmer

cam

4.2.8

Adjustment

knife

engagement

4.2.9

Adjustment

needle

thread

tension

releasing

amount

4.3

Adjustment

Needle

Thread

Remaining

Length

4.4

Cautions

Installation

Touch-Back

Solenoid

4.5

Touch-Back

Pushbutton

4.6

Wiper

4.6.1

Height

wiper

4.6.2

Wiper

operation

position

4.7

Adjustment

Forward

and

Reverse

Stitch

Lengths

4.8

Adjustment

Feed

Dog Inclination 13

4.9

Timing

Feed

4.10

Hook,

Bobbin

Case,

and

Bobbin

TROUBLESHOOTING

From the library of: Superior Sewing Machine & Supply LLC

SPECIHCATIONS

Model

item ^

LS2-1180-LiT

LS2-1180-MIT

LS2-1180-MITW

LS2-1180-HIT

LS2-1180-BiT

Material

weight

Light

medium

Heavy

Max.

sewing

speed,

spm

4300

5000

3500

3000

Stitch

length,

0to7

Needle

bar

stroke,

29.0

31.8 33.0

35.0

Presser

foot

stroke,

(Knee

lifter/Manual)

11/4

11/5

13/5

Needle

DA X

1#11

DB X

1-2#14

DB X

1#22

Hook

Standard

(for

thread

trimmer)

Heavy

[forthread]

1trimmer >

Heavy (Large)

[forthread)

'trimmer J

Bobbin

case

Standard

Heavy

Large

Bobbin

Made

aluminum

for

thread

trimmer

Made

steel,

for

thread

trimmer

Made

steel

for

thread

trimmer, large

Thread

trimmer

Rotary

scissoring

left

movable

knife

and

right

fixed

blade

Thread

trimmer

starting

Solenoid

actuation

Knife

drive

Cam

drive

Touch-back

Wiper

——o

Oil

MC70M

From the library of: Superior Sewing Machine & Supply LLC

THREAD

TRIMMER

SYSTEM

2.1

Electric

Section

Part

Names

(T)

Sewing

machine

Balance

wheel

(7)

Wiper

solenoid

Machine

cord

plug

Detector

cord

plug

(iB)

Operation box

(2) Touch

switch

(5) Synchronizer

(§)

Motor

Control

box

Pedal

(3)

Back

solenoid

(e) Thread trimmer solenoid

(9)

Drive

pulley

Operation

box

cord

plug

POWER

ON/OFF

pushbutton

From the library of: Superior Sewing Machine & Supply LLC

2.2

Machine

Head

Section

(1)

Thread

trimming

mechanism

Part

Names

(?)

Thread

tension

release

©Flexible

wire

Needle

bar

connecting

link

guide

(4) Pedestal ©Movable

knife

(left)

Fixed

blade

(7)

Knife

driving

crank ©Cam

follower

crank

(1)

©Cam

follower

crank

(2)

Stopper

©Fixed

blade

bracket

Link

Knife

base

(left)

Knife

driving

shaft

©Coil

spring

Driving

lever

©Thread

trimmer

solenoid

From the library of: Superior Sewing Machine & Supply LLC

2.3

Machine

Head

Section

(2)

Touch

back

mechanism

Part

Names

Cover

(4)Coil spring

@Pin

Micro

switch

@Side

cover

Bushing

Reverse

sewing

crank

<§)

Spring

bracket

Switch

(5)

Link

@Wiper

(n)

Pushbutton

Plunger

(g)

Feed

regulator

cam

Reverse

sewing

lever

(||)Solenoid

mounting

bracket

Wiper

solenoid

(e) Wiperbracket

(9)Switch bracket

(g)

Back

solenoid

Link

Spring

bracket

(|l)For

reverse

sewing

-Ql)

From the library of: Superior Sewing Machine & Supply LLC

PREPARATIONS

BEFORE

OPERATION

3.1

Installation

Sewing

Machine

and

Motor

Operation

box

(option)

I I

Pully

^Belt

1—»

fog

i (

=—1

1—

f\=\

•^1

•—

Power

push

button

Passing

the

Machine

cords

•Receptacles for

machine

cords

Control box Round hole in table

Operation

box (option)

Wiring between sewing machine

and

control box

Rubber

cup

Detector

Machine

Operation

box

Connectors

location

the

control

box

ddOIIdD

External

knob

1-2 position

select

switch

A/ote:

Before plugging or unplugging, be sure to turn

off

the POWERON/OFFpushbutton.

Pass two cables from the sewing machine through the

round

hole in the table

and

connect

the two

plugs

into

the

respective

plug

receptacles.

From the library of: Superior Sewing Machine & Supply LLC

Adjusting tool

BEFORE

AFTER

3.2

Adjustment

Machine

Stop

Position

3.2.1

Adjust

"UP"

position

When

the

pedal

is kicked

down

by heel,

the

machine

stops

"UP"

position.

the

marks

deviate

larger

than

adjust

follows.

(1)

Disconnect

the

plug (12 pins)

cable

from

the

machine

head.

(2) Run

the

machine

and

stop

at "UP" position.

(3) While

holding

the

pully

insert

the

"adjusting

tool"

the

hole

then

remove

the

tool.

3.2.2

Adjust

"DOWN"

position

When

the

pedal

Newtral

the

machine

stops

"DOWN"

position.

the

marks

deviate

larger

than

adjust

follows.

(1) Disconnect

the

plug (12 pins) of

cable

from

the

machine

head.

(2) Run

the

machine

and

stop

"DOWN"

posi

tion.

(3) While

holding

the

pully

insert

the

"adjusting

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

3.2.3

Comfirm

the

stop

operation

then

the

plug

(12

pins)

coming

from

the

machine

head

into

the

receptacle.

3rd

mark

Rotating

direction

1st

mark

Timing

mark

Arm

ADJUSTMENTS

4.1

How

Adjust

the

Timing

between

Needle

and

Hook

The

standard

timing

between

needle

and

hook

is following

the

table.

(mm)

Sub>cl8ss

Item

-L

•M

-B

•H

Needle

lift-up

quantity

from

lowest

position

1.8

2.0

1.8

Distance

between

upper

side

of^

needle

hole

and

hook

point

0-0.2

———

Distance

between needle and ^

hook

point

0.05

Distance

between

needle

point

and

needle

plate

setting

base,

highest

position

needle

bar

17.3 18.8

18.8

20.6

®E]

1st

mark

"Up"

position

3rd

mark

"Down"

position

Fig.1

From the library of: Superior Sewing Machine & Supply LLC

4.2

Thread

Trimmer

Mechanism

4.2.1

Construction

Fixed

blade

bracket

unit

Thread

guide

Fixed

blade

Knife

base

unit

Thread

trimmer

solenoid

Thread

trimmer

solenoid

unit|'

twist

spring

Thread

trimmer

cam

Coil

spring

Movable

knife

(left)

Knife

driving

crank

Knife

driving

shaft

Cam

follower

crank

(1)

4.2.2

Cautions

adjustment

Flexible

wire

twist

spring

Fig. 2 Cam follower crank (2)

hook

shaft

cam

system

utilized

for the

thread

trimmer

drive.

Therefore,

during

the

adjustment

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

operating

state (the

roller

cam

follower

crank

(2)

engaged

with

the threadtrimmer

cam),

the

movable

knife

makes

contact

with

the

needle,

resulting

damage.

sure

bring

the

solenoid

into

the

operating

state

only

during

normal

thread

trimming

cycle

(Needle

DOWN

position

position).

4.2.3

Installation

knife

base

and

fixed

blade

bracket

unit

4.2.3.1

Knife

base

unit

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

the

hook

shaft

bushing (left) and fix with

the

screws

4.2.3.2

Fixed

blade

bracket

unit

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

unit with the hook positioner dismounted, and

then

fix

with

the

screws

® .

inlt /

Knife

base

unit

Hook

shaft

bushing

(left)

Rg.3

Fixed

blade

bracket

unit

Fig. 4

From the library of: Superior Sewing Machine & Supply LLC

4.2.3.3 Relation between fixed blade

and

movable knife (left) edge

(1) Fig. 5

shows

the

standard

state.

0.3

(2) If

the

dimension

indicated

in Fig. 5 is

too

large,

three-thread breakage will occur, leading

needle

thread

cast-off, etc.

after

the

thread

trimming.

Reversely, if

the

dimension is

too

small, thread

trimming

error

may result. Therefore,

caution

must

exercised.

(3) Make

the

adjustment in (2) in

the

installation

procedure of fixed blade bracket unit or in

the

installation

procedure

fixed blade.

4.2.4

Connection

knife

base

and

knife

driving

crank

(1) Make

connection

shown

in Fig. 6.

this

time,

use

care

for

the

position

link

depends

the

sewing

machine

model.

4.2.5

Knife

driving

shaft

and

parts

(Knife

edge).

•j-r

Fixed

blade'

LS2-1180-LIT

LS2-1180-MiT

LS2-1180-HIT

Link

Knife

driving

crank

Coil

spring.

Cam

follovwer

crank

(1)

\ Cam follower

crank

(2)

[rf

Bushing

90.5

(BIT:

87.5

mm)

Cjyr

Stopper

Knife'driving shaft

Rg.7

Rg.5

Rg.6

Movable

knife

(left)

LS2-1180-BIT

(1) Fig. 7 shows

the

standard setting position.

(2) During assembling, be sure

pass

the

knife driving shaft through

the

knife driving crank first.

(3) Fix the cam follower crank (1) to the recess of knife driving shaft

the position shown in Fig. 7.

(4) Fix the stopper to the

recess

so that the knife

driving

shaft can rotate smoothly without play inthe

axial

direction.

From the library of: Superior Sewing Machine & Supply LLC

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