Brother LK3-B220 Service Manual

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This

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be

acquainted

machine

any difficulties.

manualiscomposed

Shooting.

with

the

and

you

The

majorityofthe

instruction

this

parts

could

book

machine

catalogue,

solve

troublesifyou

PREFACE

of

three

chapters.

servicing

whichisincluded

perfecUy.

then

please

we

hope

problems

with

read

you

would

encounter

Mecharusn.

can

tins

machrne.Inord»

this

service

get

man^

full

know

any

problems

^e

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to

caref^

wttho

BROTHER

INDUSTRIES.

LTD.

CONTEISTTS

CHAPTER

1.

Upper

2.

Feed

3.

Thread Thread

4.

5.

Work

6.

Clutch

7.

Safety

CHAPTER

1.

Adjustment

2.

Adjustment

3.

Adjustment

4.

Adjustment

5. Adjustment on

6.

Adjustment

7.

Adjustment

8.

Adjustment

9.

Adjustment

I

MECHANISM

shaft,

take-up

mechanism

trimming nipper

clamp

lifting mechanism 7

mechanism

11

ADJUSTMENT

on

on on

lever, needle

bar

and

hook

mechanism

mechanism 4

mechanism

needle

bar

and

feed

clutch

work

thread

safety

thread

drive bobbin

shuttle

mechanism

mechanian

clamp

mechanism

trimming mechanism 22

mechanian

nipper

mechanism

winder

mechanism.

hook

mechanism

1

2

5

8

10

11

14

16

20

26

28

31 32

CHAPTER

1.

Thread

2.

Thread

3.

Clutch

4.

Feed

5.

Needle

ill

TROUBLE

tension

trimming

mechanism

bar

and

SHOOTING

mechanism

hook mechanism 36

33

34

35

36

1.

Upper

shaft,

take-up

CHAPTER

I

lever, needle bar

MECHANISM

and

hook mechanism

DiroctiantofoUto

ui^

.Wit

Hign

speeo

puoey i417B3001

141781001

Oscillating rock shaft

141787001

Rotating (high

lever

Other

shuttle

crank.

All

and

shuttle

Brothersown

justment

justmentismade

hook

the

clearance.Atthat

body,

And,inordertoeliminate

wiUi,

movement

speed

pulley

and

needle

rotating

driver

the

above

Brother's

hook

bar

movement

with

mechanisms

own

featured

hook

with

washertoget

merelybyadjusting

adjusting

shuttle

race

ring,

adjusting

therefore,itdoes

thus

you

can

whichistransmitted

and

low

with

the

transmittedtoupper

the

intermittent

are

designed

this

machine.

timing

the

shuttle

ring.

time,

lower

not

require

noise

get

very

Crank

rod

1417BS001

speed

pulley)ischanged

intermittent

actionofcrank

designedtobe

hook

timing

adjusting

proper

mechanism

clearance

ringtoget

race

body

Thus,

shutUe

shaft

and

any

outofshutUe

quiet

operaUon

Upper

shaft

U176S001

Lower

sfiaft

crank

141793001

from

the

motor

into

actionofupper

shaftischanged

rod,

durableatmaximum

adjusting

mechanism

eliminates

between

proper

moves

lower

troublesome

with

the

race

and

shaft

crank

adjustmentonhook

hook,

the

«venatmaximum

Counter weight

I4I773000

Lower

shaft

141795001

with

the

intermittent

vertical

shaft

oscillating

movementofthread

and

needle

into

oscillating

rock

high

and

noiseless

the

conventional

needle

space.

shutUe

and

hook

Namely,ifyou

aidofthe

hook

move

together

screw

movetoget

timing.

springonshutUe

high

speedof2.000

Takotip

lever

100271001

Needle

t>ar

crank

142207001

—'

Needle

bar

141776001

Shuttle

driver

141797001

fftfTT

Shuttle hook

141804001

actionofpulley

take*up

bar

crank.

movement

body

and

lower

shaft

speedof2,(X)0

s.p.m.

mechanism

troublesome

point

This

turn

thread

with

fine

the

shuttle

pitched

the

desired

shuttle

race

driverisequipped

s.p.m.

of

on

ad

in

-1

-

2.

Feed

mechanism

Oiractiontoretite

Tack

width

(^

141837001

teed

lever

141765001

Tack

width

141838001

K«_i<rTack

I

aQustar

lengthregulator

141839001

Feed

plate

141854001

Slide block

Worm

set

with

Tack

width

movementinaccordance into

linear

movementofpresser

and

forth

movement.

Tack

length

in

accordance

movementofpresser

Both

movements

opening of work clamp. ^ ^

This

machineisdesigned

smoothly.

adjuster

14182300)

upper

shaft

drives

feed

leverisconnected

with

the

arm

leverisconnected

with

the

rotationoffeed

arm

are

transmittedtopresser

with

the

nottocause

Tack

length

regulator

141833001

worm

wheel

and

wuth

cam

groom

routionoffeed

with

the

actionofUck

cam

groove

cam.

actionoftack

the

with

This

arm.

torn

movement,

rotates

cam.

oscillating

length

thusitperforms

the

with

This

width

roller

anditbrings

rod

thus

cam.

roller

oscillating

adjuster

movementischanged

and

uck

all

the

anditbrings

osallatjr®

movementischanged

anditbnngs

oscillating

length

regulator

designmrecutangular

mechanism

are

back

movement

mto

zigaag

ever.

functioned

-2-

♦

Adjusting Tack

illustration.

This

screw

tack

width

adjustment

upordown.

width

it

defined

is

made

the

widthofAasper

by

moving

adjusting

Shorter

Longer

\

Adjusting screw

Tack

length

illustration.

This

adjustmentismade

upordown.

it

defines

by

Adjusting

the

moving

141S42001

length

screw

Thumb

of B

as

screw

per

-3-

3.

Thread

trimming

Timed

trimffling lever

141867001

mechanism

Knift

ctm

105956001

Lower

Upper

o o

Thread

retainer

thread

141863001

thread

141864001

14186S001

kntle

knife

Knife

cam

assembled

and

transmitted

the

thread

trimming knives

slide block stud pin

thread

knife

This

uniform

trimming

barisengaged

machine adopts

thread

and fixed knives and ensures very stable thread trimming.

to

lever

tails

with

the

knives

contacts

slide

with

the

thread

almost

feed

cam

operates

with

the

are

stationed

with

thread

block

stud

aidofspring

the

thread

intermittent

with

trimming

actionofknife

the

thread

lever plate.

pin is disengaged

and

knives

trim

trimming

hooked since

When

with

thread

threads.

lever

bar.

trimming

left

when

At

thread

treadle

feed

the

stop

trimming

lever

trimming mechanism of movable knife action only, and features

sameasthe

conventional scissor

system

being

consisted of movable

This

method becomes possible

cam

is depressed,

knives to be replaced without much difficulties which is required on scissor system.

-4-

lotates

position,

lever

plate

and

the

4.

Thread

nipper

mechanism

Oirvctiontoratita

Tlweed

Feed

cem

Thread

nipper

mechanismisplayinganimportant

roleofpreventing thread

tailatthe

end. therefore, please

carefully.

With

the

moves

and

lever,

thread

connecting

andonthe

releases thread

nipper

The

nipper

spring

motion of

therefore,

rotation

the

at

of feed cam,

transmitstothread

nipper

shaft

and

partofcamofthread

main

fastening

on

needle

thread

the

stop

lever and it releases

nipper

lever

141911001

thread>offatthe

connecting plate,

thread

nipper

tension

regulator

plate,ittightens

bar.

nipper spring on needle

position, thread nipper adjusting

main

tension regulator and thread nipper spring. And when work clamp

AcQusting

scraw

009711412

Tlwead nipper

adjusting

141915001

beginning

read

thread

nipper

lever

nipper connecting

thread

nipper

fastening

nipper

and

plate

shaft,

with

thread

and

very

the

connecting

141967001

Threed

lever

Thread

141922001

Thread

it

bar

is connected with

lever

nipper connecting

O

..

nipper

connecting

nipper

141923001

141918001

Work

""l

shaft

lever

plate

damp 141899001

is engaged with

lifting

shaft

Maintension regulater assembly

Thread

Tension

Needte

bar

141776001

the

work

clamp

thread

nipper

141779001

fasteming

tension

141995001

relesse

141996001

lifting,

stop

lifting lever is depressed, work clamp lifting shaft rotates, stop lever is engaged and it tightens

thread

The

nipper

presstire on

spring.

thread

nipper spring is unable to be adjusted on

the

conventional model, however,

this machine is capable to adjust it, thus, it brings good sewing effects and it widens the range of

adjustments on different kinds of materials and threads. This adjustment of pressure can be

easily done by

spring

adjusting plate.

release

lever

plate

lever

rwd

cam

Spring

trusting

Waakar

Stnngir

plate

-5-

Needle

bar

141776001

Thraad njppar spring

115489001

1

>Tt>wd

tonsion

141922001

Main

115599001

faradwt

tension

Thumb

117457001

regulator

screw

In accordance with wider amount of main

tension

mechanismisexplained

as

per

r^ulator,

arrow

followed

thus it enables to adjust the tension depending on the thickness of the thread. This

on the

with

the

above

thumb

tension

illustration,

screw.

release, it

that

is.

widens

when

the range of adjustment on main

bracketisrotated,

the

moves

When you wish to release tension on thread nipper spring manually, just depress the handle on the

face

plate.

-6-

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K ant)

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f'^ono

the /eft

h'ft

Up

Z'Z!

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ensi

-7-

6.

Clutch

mechanism

Qutch

11S54S001

Brake

lever

141954001

stoppv

141782001

Ouch

144427001

lever

141783001

141962001

c

v-"^S^

Outch

tnppcng lever

141961001

Drive connecting lever

141977001

Food

cam

Clutch tripping dog lever

Outch

cam

[frrrr

141970001

lever

stopper

This

model, LK3-B220 is

starting and finishing is reduced so

to

stop,

and

prevented

adopted

Brother's

that

thread-offatstart,

unique two driving belts

the

shock will be lessened when

thus

the

newly developed

system.

the

mechanism

The

speed on

machine is going

is

ensured

obtain smooth operation. Furthermore, this machine is adopted endless belts vertically which

eliminate

noise

and

vibration

considerably.

1) At the stop position, by belt guide lever is positioned at idle pulley and bobbin winder pulley.

2) At the start, when \'ou depress the actuating pedal, the actuating lever engages to work

clutch actuating lever, connecting lever, connecting rod and disengages clutch. At

at

belts are positioned

shaft

3) At sewing, it becomes high speed of

at

high speed pulley

4)

5—6

stitches prior to the stop, it reduces the speed to 800 s.p.m. again and prevents thread

low speed pulley and idle pulley and motion is transmitted to upper

Durationofspeed

Speedofreduction:

and

idle pulley.

reduction;

2,000

s.p.m. and by belt guide lever, belts are positioned

1—3

800

stitches

s.p.m.

breakage and shockatthe stop.

-8-

that

time,

to

(

before

the

endofone

cycleofsewing,

when

tripping

dogisover

the

stop

aun

sewi

Wing

cycleiscompleted

5)

Emergency

When

you

emergency

^

i""

stop lever

depressed

stop

emergency

lever

plaj«

and

machine

same

automatically

stop

lever

roleasmentioned

'='"^

pulley

down,

^tch.

thus

and

idle

puUeybybelt

stops.

tripping

above,

dog

thus

clutchisengaged.Atthat

guide

lever,

whichisassembled

machine

stops.

with

thus

I

-9-

7.

Safety

This

Namely,

operation,

mechanism

machineisdesignedtocontrol

even

if the work

work

work clamp is lifted up.

Drive

conoKtinc

tmr

PMt

I4I976001

clamp

Dm*

.C''..,

Worli

clamp

stays

down

the

machine will not

Liftni

levtr

141882001

coimaetng

141977001

clamp

I4I88I001

iavar

lever

the

motionoflevertoprotect

lift treadle is

and

evenifactuating

aim

pawl

shaft

the

erroneously

treadleiserroneously

depressed

machine

while

from

the

machine

depressed

start.

The

left

illustration

shows

that

clamp lifts up.atthis position, claw prevents

the

movement of

thus

machine

does

actuating

not

start

connector

Duringthe machine'soperation, claw prevents

the movement of work clamp connecting

lever, thus work clamp does not lift up.

damage.

is in

when

the

work

lever,

-10-

O

X

>

u

X

>

c

»

ra

I

O

3

O

o

a

cr

tt

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a

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a

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c.

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m

X

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3"

e

o

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1

3

5.

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3

damp b*r

MI775001

btr

•<1776001

Neada

'•CObody

141603000

scfow

141806001

^sting

teraw

013761212

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