Brother T-8421B, T-84228, T-8722B, T-8452B, T-8752B Instruction Manual

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84228

MANUAL

INSTRUCTION

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INSTRUCCIONES

MANUAL

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T-8452B,

2 h 5

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instructions below and the explanations given inthe instruction manual.

With

industrial sewing machines, it is normal to carry out work while positioned directly in front of moving parts suchasthe

needle and thread take-up, and consequently there is always a danger of injurythat can be caused by

the instructions from training personnel and instructors regarding safe and correct operation before operating the machine

that you

will

know how to

use

it correctly.

sewing

machine.

Before

using

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please read the safety

these

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This instruction manual

safe

Indications

A

indications

operation

of this

DANGER

CAUTION

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A

(S)

SAFETY

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their

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the

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This symbol ( ) indicates something that you should be careful of. The picture inside the triangle

indicates

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This

andtoprevent

The

instructions

The

instructions

equipment and surroundings^

the

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may

could

caution

that

are

and

injury to yourself or

which

follow

result in

which

deathorserious

follow

cause

that

mustbetaken.

means

"beware of injury".)

something

usedonthe

injury

that

this

term

when

you

must

machine

other

indicate

injury.

indicate

using

not

itself

are

people.

situations

the

where

machineorphysical

do.

provided in

failuretofollow

ordertoensure

damage

the

to

o

This

symbol

natureofthe

(For example, the symbol at left means "youmust make the ground connection".)

( ^ )

thing that

indicates

must

something

be done.

that

you

must

do.

The

picture

inside

the

circle

indicates

the

T-8421B,

8422B,

8452B, 8722B,

8752B

2.

Notes

on

safety

A

Wait at least 5 minutes after turning off the power switch

before opening

A

severe

injury.

Use

the

from

o

sources

electrical

Sources

problems

Any fluctuations in the power supply voltage should be within ±10% of

machine.

Voltage fluctuations which

may

cause

The power supply capacity should be greater than the

requirements for the sewing machine's power

consumption.

Insufficient power supply capacity may

problems with correct operation.

the

face

plate of

the

control box. Touching

Environmental

sewing

machineinan

of strong electrical noise

line

noiseorstatic

of strong electrical noise may

with

correct

operation.

problems

with

area

electric

the

are

correct

noise.

rated voltage for

greater

operation.

which is

A

than this

DANGER

CAUTION

requirements

free

such

as

o

cause

the

cause

o

and

disconnecting the power cord from the wall outlet

areas

where

high voltages

The

ambient

range

of 5°C to Temperatures may

cause

The

relative humidity should be within

45%to85% should Excessively dry or humid

formation may

operation.

In

the

event

and

disconnect

Lightning

operation.

temperature

35°C

which

problems

during

occurinany

cause

of an electrical storm, turn off

the

may

cause

are

present

should

during

use.

are

lower or

with

correct

use,

devices.

problems with correct

power

cord

problems with correct

higher

operation.

and

no

environments

from

can

be within the

the

dew

the

wall outlet.

result in

than

this

range

formation

and

dew

the

power

of

Machine installation should only be carried out by

a qualified

0

Contact your Brother dealer or a qualified electrician for any electrical work that may need to

O

be

done.

The sewing machine weighs approximately 50 kg. The installation should be carried out by two or

O

more

Do not

complete.

0

is

depressed

injury.

people.

connent

The

technician.

the

power

cord until installation is

machine may

by mistake, which could result in

operate

Turn off the power switch before inserting or

Q

removing the plug, otherwise

control

box

could

result.

damage

Be sure to connect the ground. If the ground

connection is not secure, you run a high risk of

Q

receiving a serious electric shock, and problems

with correct operation may

also

occur.

Installation

ifthe treadle

to the

When

securing

excessively or fasten them too hard with staples,

o

otherwise there is the

shocks

0

should be secured in such a way so that they

cannot

tilting

A

only

head may

may

Be sure to wear protective goggles and gloves

when handling the lubricatingoiland grease, so that

0

they do not get into your

otherwise

Furthermore, do not drink the oil or

under

vomiting

Keep

could

If using a work

move.

Use

both

it back or returning it to its original position. If

one

get

caught.

any

and

the

cords,

do not

danger

occur.

table

which

hands

to

hold

hand is used, the weight of the machine

cause

your hand to slip, and your hand

inflammation

circumstances,

diarrhea.

oil

outofthe

can

reach

that fire or electric

has

casters,

the

machine

eyes

or onto your skin,

result.

as

they

of children.

bend

head

eat

can

the

cords

the

casters

when

the grease

cause

T-8421B,

8422B,

84o2B,

8722B,

8752B

This sewing machine should only be used by

(S)

(S) o

operators

in

safe

The applications

Be

machine.

Ifgoggles

needle

enter Turn off

The

depressed

•

If using a work

should

cannot

who

use

beforehand.

sewing

suretowear

are

breaks, parts of

your

eyes

the

power

machine

by mistake, which could result in injury.

When

threading

When

replacing

When'not

the

machine

be

secured

move.

have

received

machine

other

should not be

than

sewing.

protective

goggles

not worn, there is the

the

and

injury

may

switch at

may

using

unattended

table

the the

the

operate

needle

bobbin

machine

which

has

in

suchaway

the

necessary

broken

result.

following times.

if

and

needle

and

casters,

A

training

used

for

when using

danger

the

needle

treadle

when

the

so

that

that if a

casters

CAUTION

Sewing

Attach all

machine.

devices

any

the

may

is

leaving

they

Do not touch

objects

A

may

machine.

Use

tilting it

only

head may

Ifanerror

or

o

power

dealerora qualified

If

nearest

o

both

one

get

smells

the

safety

devices

If

the

machine

attached,

against

result in

back

handisused,

may

caught.

switch.

machine

Brother

injury may result.

any

of the moving parts or

the

machine

personal

hands

to

hold

or returning it to its original position. If

cause

your

occursinmachine,orif

are

noticed, immediately turn off

Then

contact

technician.

develops

dealer

or a qualified

before

using

is

used

while sewing,asthis

injury or

the

hand

a problem,

damage

machine

weightofthe

to slip,

abnormal

your

nearest

the

sewing

without

press

head

machine

and

your

Brother

contact

technician.

these

any

to

when

hand

noises

the

your

the

Tum

off

the

power

cleaning.

A

depressedbymistake,

Use

tilting it back or retuming it to its original position. If

A

only head

may

The

both

hands

one

hand is used,

may

cause

get

caught.

machine

switch

may

which could result in injury.

to

hold

before

operateifthe

the

machine

the

weight of

your hand to slip,

Cleaning

carrying

treadle

head

the

machine

and

your hand

out

when

Be

0

is

suretowear

when

handling

they do not

otherwise

Furthermore,donot

under

vomiting

Keep

inflammation

any

and

the

oil out of

protective

the

lubricating oil

get

into your

can

drink

circumstances,

diarrhea.

the

reach

goggles

and

eyes

or onto your skin,

result.

the

oiloreat

as

they

of children.

and

gloves

grease,sothat

the

grease

can

cause

Use only the proper replacement partsasspecified

by Brother.

T-8421B,

8422B,

8452B,

8722B,

8752B

3.Warning

The

following warning

Please difficult to

follow

labels

read,

the

instructions on

please

labels

contact

appearonthe

the

labels at all

your

nearest

sewing

Brother

machine.

times

dealer.

when

using

the

machine.Ifthe

labels

have

been

removedorare

1

ADANGER

Hazardous voltage

will

Turn and

before opening this

cover.

A

AGEFAHR

Hochspannung

cause

off

wait

injury.

main

Sminutes

Be

secure,

verletzungsgefahr!

Bitte

switcfi

sure

schalten

hauptschalter

warten

s!e 5

t)evor

atxleckung fiffnen.

minuten,

sle

diese

to connect the ground. Ifthe ground connection is not

you run a high risk of receiving a

and problems with correct operation may

Direction of operation

sle

aus

den

und

attendre5minutes

d'ouvrir la capoL

ADANGER

Un voltage non

provoque

Etelndre rinterrupteur et

des

adapte

IXessures.

avant

A € ^

APELIGRO

Un voltaje

inadecuado

puede

provocarlas

t]eridas.Apagar el

interruptor principal y

esperar

5 minutes

de

abrir

esta

cublerta.

serious

also

electric

occur.

antes

shock,

A ^

A

CAUTION

Movingpartsmay

Operate

Turn

off

with

main

threading, changing bobbin

and

needle, cleaning etc.

Safety

devices:

(A)

Finger

(B)

Thread

guard

take-up

cause

safety

switch

devices.

cover

injury.

before

Oil

Control

pan

box

2867M

2083M

IV

T-8421B,

8422B,

8452B,

8722B,

8752B

2868M

CONTENTS

1.

MACHINE

2.

NAMES

3.

INSTALLATION

3-1.

Table

3-2.

installation

3-3.

Lubrication

3-4.

Connecting 3-4-1. 3-4-2.

3-5.

Test

4.

PREPARATION

SPECIFICATIONS

OF

MAJOR

processing

the Opening Connecting

cords

the

PARTS

diagram

control

the

cords

operation (Operating

BEFORE

box

cover

the

treadle) 15

SEWING

4-1. Installing the needle 16

4-2. Removing 4-3. Winding

4-4. Installing

4-5.

Threading

4-6. Adjusting

4-7. Using the

4-8. Using

the

bobbin 17

the

lower

thread

the

bobbin 19

the

upper

thread

the

stitch length 23

knee

lifter 23

thread

wiper

(Models with thread trimmer only) 23

4-9. Corner sewing method (T-8452B, 8752B) 24

5.

USING

THE

OPERATION

PANEL

11 11 11

16

18

21

1

3

4

5

5 9

7.

SEWING

7-1.

Sewing

7-2. Backtacking 7-3.

Sewing

8.

THREAD

8-1. Adjusting 8-2. Adjusting

8-3. Adjusting

condensed

TENSION

the the

the

trimming (Models with

8-4. Adjusting

9.

CLEANING

the

9-1. Daily cleaning

9-2. Lubricating via

stitches

thread presser

tension 35

foot

pressure

trailing length after

thread

take-up

trimmer only)....36

amount

procedures

the

oil

cover

32

33 34

35

36

thread

37

38

(every 6 months) 39

9-3. Applying

appears

10.

ADJUSTING

LUBRICATION

11.

TROUBLESHOOTING

grease

- When "GREASEUP"

(Semi dry specifications) 40

THE

ROTARY

AMOUNT

HOOK

43

44

11-1. Sewing 44 11-2. Error

code

displays 49

(BASIC OPERATIONS) 25

5-1.

Names

5-2. Sewing start and

and

functions

end

backtack stitches 27

5-3. Sewing fixed stitches 28

5-4. Using the lower thread counter 29

6.

USING

THE

OPERATION

PANEL

(ADVANCED OPERATIONS) 30

6-1.

Names

6-2. Adjusting the needle up stop position 31

6-3. LOCKkey 31

6-4. Resetting all settings to their defaults 31

and

functions

25

30

T-8421B,

8422B,

8452B,

8722B,

8752B

1.

MACHINE

1.

MACHINE

SPECIFICATIONS

BROTHER

INDUSTRIES,

•T-8421B-T03

ABC

A

B

Rotatv

Stitch

Thread

hook

function

trimmer

______

LTD.

555

DBF

•

Standard

Fixed

4

2

needle

1

-

hook

bar

Large

Split

7

hook

5

needle

2

O

bar

D

E

F

"

Quick

Thread

Lubrication

reverse

Use

wiper

—

type

For

Minimum

F

foundation

4

O O

0

lubrication

For light-weight

medium-

weight

3

and

materials

T

O

-

3

Semi

dry

For

heavy-weight

5

materials

T-8421B, 8422B,

8452B,

8722B,

8752B

T-8421B

Max.

sewing

Start

backtacking

End

backtacking

Max.

stitch

Presser

height

Feed

dog

Needle

Motor Control

T-8422B

Max.

sewing

Start

backtacking

End

backtacking

Max.

stitch

Presser

height

Feed

dog

Needle

Motor

Control

speed

backtacking

speed

length

foot

height

(DPx5)

circuit

speed

backtacking

speed

length

foot

height

(DPx5)

circuit

Lifting

Knee

Lifting

Knee

and

lifter

and

lifter

lever

continuous

-T3F

3,000

#9-#14

rpm

-huo

4,000

rpm

1.

-133

3,000

rpm

250-1,800

1,000

rpm

-T03

4,000

MACHINE

rpm

SPECIFICATIONS

3,000

4 mm 1 5 mm

7

mm

13

mm

1

mm

#14-#22

AC

servo

#11-#16

motor

(4-pole,

550W)

Microprocessor

-4oo

250-1,800

1,000

rpm

3,000

rpm

-huo

4 mm 1 5 mm

7

mm

10

mm

1

mm

#11-#16

AC

servo

motor

(4-pole,

Microprocessor

550W)

-105

rpm

#14-#22

T-8452B

Max.

sewing

Start

backtacking End

backtacking

speed

backtacking

Max. stitch length

Presser

foot

height

Feed

dog

height

Needle

Motor

Control

T-8722B,

Max.

Start

backtacking

End

Max.

Presser

(DPx5)

circuit

8752B

sewing

backtacking

speed

backtacking

stitch

length

foot

height

Feed

dog

height

Needle

Motor

Control

(DPx5)

circuit

speed

Lifting

Knee

speed

Lifting

Knee

and

lever

lifter

and

lever

lifter

continuous

-403 1 -405

3,000

rpm

#11-#16

AC

250-1,800

1,000

servo

motor

Microprocessor

3,00(

250-1,800

1,000

servo

motor

Microprocessor

5 7

10

1

7

10

1

rpm

mm mm

mm

(4-pole,

rpm

mm mm

mm

(4-pole,

rpm

#14-#22

550W)

rpm

#14-#22

550W)

T-8421B,

8422B, 8452B, 8722B,

8752B

2.

NAMES

2.

NAMES

OF

MAJOR

PARTS

OF

MAJOR

PARTS

<T-8452B,

8752B

>

0

Bobbin

(1

Lifting lever

(3

Presser

(5

Knee

(7

Stitch length dial

(9

(11

Oil

Operation panel

(13

(15

Stop

Safety

devices

winder

foot

lifter

assembly

gauge

window

lever (T-8452B, 8752B )

(16) Thread take-up cover

T-8421B,

8422B,

The

settings

using

used.

(Settings

machine

Thread wiper (T-8422B, 8452B, 8722B, 8752B)

(2

Quick

(4

(6

(8

(10 (12

(14

(17) Finger

8452B,

reverse

Control Power

switch

Reverse

Machine pulley

Cotton

guard

8722B,

the

operation

made

operation.)

box

lever

stand

8752B

for this sewing

panel

using this panel

(Actuator)

machine

(13),

are

andsothis

will

not affect sewing

carried out

panel

is not

3909M

3.

INSTALLATION

A

CAUTION

3.

INSTALLATION

Machine installation

0

qualified

Contact

for

The

O

people.

About

• Do not televisions, radios or

equipment may be affected by electronic interference from the

sewing

• The sewing machine should be plugged directly into an AC wall

outlet. Operation problems may result if extension cords are

used.

Carrying

•

The

machine

showninthe

* Hold the motor cover (A) by hand alsosothat

not

technician.

your

any

electrical work

sewing

Installation

the

machine

set

up this sewing

machine.

the

illustration.

rotate.

machine

should be carried by

should

Brother

machine

dealer

that

weighs approximately 50 kg.

shouldbecarried

set-up

machine

cordless

only be carried

or a qualified electrician

may

need

outbytwoormore

to be

out

done.

location

near

other

equipment

telephones,

the

arm

otherwise

by two

the

by a

pulley

0

such

people

A

as

such

does

Do not

complete. depressed

Use

tilting it back or returning it to its original position. If

only

head

may

as

both

one

may

get

connect

caught.

the

power

cord until installation is

The

machine

by mistake, which could result in injury.

hands

handisused,

cause

may

operateifthe

to

hold

the

machine

the

weight of

your hand to slip,

head

the

and

treadle is

your hand

when

machine

2086M

Tilting

• Hold section (8) with your footsothat the table

Returning

1. Clear away any tools, etc. which may be

2. While holding

back

the

machine

and then push the arm with both hands to tilt back the machine

head.

the

machine

the

face plate with your left hand, gently return

machine

head

to the upright position with your right hand.

head

headtothe

upright

near

the table holes.

does

not move,

position

the

Q rl

(A)

2870M

2871M

2872M

T-8421B,

8422B,

8452B,

8722B,

8752B

3.

INSTALLATION

3-1.

Table

processing

diagram

• The top of the table should be 40 mm In thickness

vibration of

• Drill

the

sewing

holesasindicatedinthe

machine.

illustration

below.

Control box mounting hole

and

should be strong enough to hold the weight and with-stand

Cotton

stand

hole

Cord

hole

Head

rest

hole

30

the

3-2.

Installation

1200

80.6

520.5

80.5.

4-29

1.

Control

(1) Control box (2) Bolts [3 pcs] (3) Nuts [3 pcs]

(4) Spring

(5)

Washers

2.

Connecting

box

washers

[3 pcs]

(6) Connecting rod (7) Nut

i

40

A-A

2873M

[3 pcs]

rod

2091M

T-8421B,

8422B, 8452B, 8722B,

8752B

Operator

(1)

3.

(1) (2)

Power

Power Screws

switch

[2 pcs]

3.

INSTALLATION

Ki)—^

2092M

4 Oil

(1) Head cushions (left) [2 pcs] (2) Head cushions (right) [2 pcs]

(3) Oil

(4) Oiler

pan

2874M

T-8421B,

8422B,

0

8452B, 8722B,

2875M

8752B

5.

Rubber

(1) Rubber cushions [2 pcs]

(2) Nails [4 pcs]

6.

Knee

(3) Knee lifter complying

cushions

lifter

complying

bar

3.

INSTALLATION

2876M

7.

Machine

(1) Hinges [2 pcs]

(2) Machine (3)

Head

NOTE:

Tap the not machine

stable

8.

Operation

(1) Operation

(2)

Screws

head

rest

the

head table hole. If the pushedinas

head

whenitis

panel

[2 pcs]

(Use for tightening

head

rest (3) securely into

head

rest (3) is

farasit

will

tilted

will

go,

not be sufficiently

back.

panei

rear

cover)

the

T-8421B,

8422B,

8452B,

8722B,

2877M

2878M

8752B

9.

Cotton

(1) Cotton

NOTE:

stand

Securely tighten the nut (4) so that

(1)

and

does

the two rubber cushions (2)

washer

so

move.

that

(3)

are

securely clamped

the

cotton

stand

the

and

not

10.

Knee

(1)

Knee

(2) Bolt

lifter

plate

3.

INSTALLATION

plate

J

<Knee

1. Turn

topofthe

lifter

the

2. Lower the

*

Loosen and

a position

2879M

adjustment>

machine pulleysothat

needle

presser

plate.

foot (5) by using

the

move

bolt (3)

the

where

the

and

knee

lifter plate (1) to

it is

easytouse.

feed

dog

the

liftinglever (4).

the

bolt (4),

is below

the

\_r

2880M

2881M

3.

Loosen

the

nut (6).

4. Turn the screw (8) to adjust so that the amount of play in the knee

lifter plate (1) is gently

5.

Securely

6.

Loosen

7. Turn the screw (10)

lifter

(7) is approximately 2 mm when the knee

pressed.

tighten

the

nut (6).

the

nut (9).

until

the distance between the end of

the screw (10) and the knee lifter (7) is approximately 5

mm.

8. Turn the adjusting screw (10) to adjustsothat the

foot (5) is at the desired position

within

a distance of 13

presser

mm of the needle plate when the knee liter plate (1) is

fully

pressed.

9. After adjustment is completed, securely tighten the nut

(9).

Within13mm

2882M

T-8421B,

8422B,

8452B,

8722B,

8752B

3.

INSTALLATION

3-3.

Lubrication

A

CAUTION

(S)

0

Do not connect the power cord

treadle is

depressed

by mistake, which could result in injury.

Be sure to wear protectivegoggies and gioves when handlingthe lubricating

into your

Furthermore, do not

diarrhea.

Keep

the

eyes

or onto your skin, othenwise inflammation

drink

oil

outofthe

reach

until

the

oil

or eat the grease under any circumstances, as they can cause

of children.

lubrication has been compieted, otherwise the machine may operate if the

oii

and grease, so that they do not get

can

result.

vomiting

and

The sewing machine should always be lubricated and the oilsupply replenished before it is used for the first time, and also

after

long

periodsofnon-use.

Use onlythe lubricating oil(Nisseki

* ifthis type of lubricating oil is difficult to obtain, the recommended oil to use is <Exxon

Mitsubishi

Sewing Lube

ION;

VG10)specified byBrother.

Mobil

<Lubricatlng

1.

Tilt

back

2. Remove

the

via

machine

rubber

the

Essotex SM10: VG10>.

oil

cover>

head.

cap

(1).

3. Use the accessory oiler (2) to pour lubricating oil into the

oil

cover

(4).

NOTE:

Do not

(3) until

fill

the

oil level

reaches

the

reference

withlubricating oil past the reference line (4).

If you pour in too much lubricating oil, it may spill out

when

the

machine

4. Replace

the

rubber

5. Return the machine

headistilted

cap

(1).

head

to its original position.

back.

* Ifthe lubricating oil level drops belowthe bottom (6) of the

oil

gauge

window (5), be

suretoadd

more oil.

line

2883M

2884M

<Lubricatlng

1. Remove the rubber

2. Use the accessory oiler(2) to pour in lubricating oil

the oil level

gauge

3. Replace

via

the

reaches

window (3).

the

rubber

oil

tank>

cap

(1).

the top reference line (4) of the oil

cap

(1).

until

* Ifthe lubricating oillevel drops below the bottom reference

line (6), be

suretoadd

more

oii.

T-8421B,

8422B,

8452B, 8722B,

8752B

•

Lubrication

Apply

1-2

drops

of oil to

the

places

indicated by

the

arrows.

3.

INSTALLATION

<Semi

dry

type

and

minimum

mm

lubrication

type>

<Minlmum * Do not

apply

<T-8452B,

lubrication

oil for

8752B>

o

semi

type

dry

only>

types.

2885M

©

o

R,—

R

T-8421B,

8422B,

8452B, 8722B,

8752B

2886M

2887M

10

3.

INSTALLATION

3-4.

Connecting

Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet

before opening the face plate of the control box. Touching

A

severe

Contact your Brother dealer or a qualified electrician for any electrical workthat may need to be done.

Do not

The machine may operate ifthe treadle is depressed by mistake, which could result in

G)

Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a serious

O

electric shock,

injury.

connect

the

cords

A

the

power

cord until all

and

problems with correct operation may

cords

DANGER

CAUTION

have

been

connected.

also

occur.

areas

where high voltages

are

injury.

present can result in

3-4-1.

3-4-2.

Opening

the

Connecting

control

the

cords

box

cover

(1)

Screw

(2)

Cover

1.

Sewing

machine

cords

11

T-8421B,

8422B, 8452B,

8722B,

8752B

3.

INSTALLATION

Pushinsecurely

the

tabs

(5)

engage.

until

(1) 7-pin (2) 10-pin

(3) 14-pin (4) 14-pin

Refertothe

motor

connector.

head

detector

operating

encoder

machine

following

unit

panel

connector

page

connector

for

the

4-pin

1

Cords

Press

the

tab.

3131M

3132M

2.

Repeat

(1)

Repeat

(2) Wire clip

NOTE:

• Bind

the

connector

• All

cords

control

cord

cable

the

cords

which

box

holder

tie (1), otherwise vibration from

sewing

can

operation of

cable

tie

cordsinsuchaway

does

not

get

pulled out.

that

come

out

should

be

secured

(3) using

to

machine

become

cause

the

may

disconnected,

problems

control box.

from

the

cause

that

repeat

with

the

to

the

<Closing

the

cover>

T-8421B,

8422B,

8452B,

8722B,

2110M

8752B

12

3.

INSTALLATION

r<Single-phase>

<Three-phase>

Green

and

(ground wire)

yellow wire

2890M

3.

Other

(1) 6-pin

(2) 4-pin motor

cords

power

supply

connector

(3) Wire clip (4)

Power

cord

<For

single-phase

the

Insert

wall

<For

1. Attach power yellow wire is

2. Insert

power

outlet.

three-phase

an cord (4). (The

appropriate

the

properly-grounded AC

NOTE:

Do

not

use

otherwise problems

may

connector

specifications>

cord plug (5) into a

speclfications>

plug to

green

ground

wire.)

plug into a

power

supply.

extension

machine

cords,

operation

result.

the

and

2891M

13

T-8421B,

8422B,

8452B, 8722B,

8752B

4

(1) (2) (3)

Ground

Ground Screw Screw

wire

[With

wire

washer]

3.

INSTALLATION

Ground symbol

NOTE:

Always be

sure

to

connect

ground wire (1), othenwise problems

may

occur

with

sewing

machine

operation.

the

T-8421B,

8422B,

8452B,

8722B,

8752B

14

3.

INSTALLATION

3-5.

Test

operation

(Operating

the

treadle)

A

CAUTION

A

Do not touch

personal

Injuryordamagetothe

anyofthe

moving

partsorpress

machine.

any

2114M

objects

against

<Turningonthe

Press

the

The

power

NOTE:

The approximately

turned

After approximately 4

Initialization) or

displayedonthe ALL" operation This times

the

machine while sewing,asthis

power>

ON power switch (1).

Indicator (2)

When

turning

treadle

on.

Is displayed,

panel

message

that

the

and

four

will

will not

power

the

"InIT

operation

changetothe

and

(3) will illuminate.

power

switchonfor

operation

seconds

the

appear

switch Is

after

seconds,

ALL"

panel.

treadle

the

turned

may

result In

the

first

panel

will

not

operate

the

power

switch Is

"inIT rPM"

(full Initialization)

After "InITrPM" or "InIT

can

be

operated.

stitch

number

second

on.

and

subsequent

display.)

time

(speed

will

(The

for

be

2116M

2117M

<Test

operation>

1. Check that the machine treadle (4) Is gently

2. Then check that It (4) is gently

pressed

3. After pressing the treadle (4) forward, needle is lowered to

sews

pressed

sews

to position (B).

at high

to position (C).

the

top of

at low

speed

when the treadle

check

the

needle plate when

when the

that the

treadle (4) Is returned to the neutral position (A), (when

needle

4. If

down stopping

the

treadle (4) Is

has

been

pressed

set.)

to position (D), (thread

trimming Is carried out for models with thread trimmer)

and

the

needle rises

above

the

needle

plate

and

stops.

the

15

T-8421B,

8422B,

8452B,

8722B,

8752B

4.

PREPARATION

4-1.

Installing

^

Turn

off

the

power

A

^

The

machine

may

the

needle

switch

operateifthe

BEFORE

A

CAUTION

before

installing

treadleisdepressedbymistake,

the

needle.

SEWING

which

4.

could

resultininjury.

PREPARATION

BEFORE

SEWING

<T-8421B,

<T-8452B,

(1)

8422B,

8752B>

^

8722B>

Long

o o

groove

O X

(2)

2894M

1. Turn highest

2.

Loosen

3. Insert long screws

the

position. the

the

groove

(1).

machine

screws

needle

pulley to

(1).

(2) straight inasfarasitwillgoso

is facing inward,

move

and

then

the

securely

needle

bar

that

tighten

to its

the

Long

groove

312oM

T-8421B,

8422B,

8452B,

8722B,

87o2B

16

4.

PREPARATION

4-2.

Removing

Turn off the power switch before removing

The machine may operate ifthe treadle is

A

BEFORE

the

SEWING

bobbin

A

CAUTION

the

bobbin.

depressed

by mistake, which could result in injury.

2895M

<Latch

1.

2. Pull

<Bobbln

1. Open the slide plates (1) by moving them to the right

2.

3.

type>

Open

the

left.

the

bobbins

case

left.

Liftupthe

bobbin

case

Remove

slide plates (1) by moving them to

rotary hook

(3).

type>

latch (2) of

(3).

the

bobbin.

latches

(2) upward,

the

rotary hook, and then remove

and

the

them

right

remove

and

the

2896M

17

T-8421B,

8422B, 8452B,

8722B,

8752B

4-3.

Winding

the

lower

thread

A

CAUTION

4.

PREPARATION

BEFORE

SEWING

A

2897M

Do not touch

may

result in

anyofthe

personal

moving parts or

injury or

damagetothe

press

any

objects against the machine while winding

machine.

1.

Turnonthe

2.

Place

3. Wind

direction indicated by

*

Check

thread

4.

Push

5.

Raise

6.

Depress

7.

Once

presser

8.

After

and

cut

power

switch.

the bobbin (1) onto the bobbin winder shaft (2).

the

thread several times around the bobbin (1) in

the

that

the

thread is not

path.

the

bobbin

presser

the

presser

the

winding of

arm

the

thread

the

foot with

treadle. Lower

the

lower

(3) willretum automatically.

has

been

thread

with

arrow.

arm

the

loose

(3) toward

the

lifting lever.

thread

wound

knife (4).

the

lower thread,asthis

anywhere

the

bobbin (1).

winding will

then

is completed,

on,

remove

along

the

start.

bobbin

2123M

Less

thread

More

thread

T-8421B,

Loosen adjust

NOTE:

80%

2124M

8422B, 8452B, 8722B,

the

screw (5)

the

amount of thread wound onto

The

amountofthread

a

maximumof80

8752B

and

% of

move

wound

the

bobbin

the

onto

the

bobbin

bobbin capacity.

presser

bobbin.

should

(6) to

be

18

4.

PREPARATION

4-4.

Installing

Turn

The

off

the

machine

BEFORE

the

power

may

SEWING

bobbin

switch

before

operateifthe

A

CAUTION

Installing

treadleisdepressed

the

bobbin.

by mistake, which could result in injury.

(3)

c:^

2899M

<Latch

type>

insert

the

bobbin (1) into

winding direction isasshowninthe

Return

the

rotary

hook

Turn

the

machine

the

tension

Pass

the

thread

passitunder

Pull

out

the

Close

the

slide

pulley to rotate

spring (4) is visible.

through slit (5) in

the

thread

to a length of

plates.

the

latch (3) to its original position.

tension

rotary hook (2)sothat

illustration.

the

rotary

hook

(2) until

the

rotary

hook

and

spring.

approximately50mm.

the

then

50

mm

2900M

Thereisan anti-spin spring (6) suchasduring

Use bobbins (1)

BROTHER.

2901M

anti-spin spring (6) inside

prevents

thread

made

the

trimming.

of light alloy

bobbin from racingattimes

the

rotary hook.

as

The

specified by

19

T-8421B,

8422B,

8452B,

8722B,

8752B

4.

PREPARATION

BEFORE

SEWING

50

mm

50

mm

50

mm

2902M

3126M

3127M

<Bobbin

1. Insert

case

type>

the

bobbin (1) Into

the

winding direction isasshowninthe

2.

There

are

three

typesofcap Thread accordance

used.

<A>

<C>

3. Insert Push

4.

5.

Close

Pass

1) thread

Pass

2)

out

1)

Pass

thread

2)

Pass through

3)

Pass

out

the

latch (9) of

the

threadbyoneofthe

with

the

shapeofthe

the

thread

tension

the

about

the

thread

50

mm.

thread

spring (4).

through

tension spring (4).

the

thread through

the

spring (7).

the

thread

through

about

50

mm.

bobbin

case

(2) into

the

rotary

slide

plates.

through

bobbin

(2) (<A>,

slot

the

slot

slots

the

rotary hook.

hook

flat.

case

illustration.

following

bobbin

(3)

thread

hole (8)

(3)

(5)

and

thread

hole (8)

(2)sothat

and

methods

case

(2)

and

under

and

under

(6),

and

the

<C>).

in

being

the

pull

the

then

pull

2903M

Thereisan

anti-spin spring (10) inside

anti-spin spring (10) prevents

times

T-8421B,

2904M

8422B,

Use bobbins (1)

BROTHER.

8452B, 8722B,

suchasduring

8752B

thread

made

of light alloy

the

trimming.

the

rotary hook.

The

bobbin from racing at

as

specified by

20

4.

PREPARATION

4-5.

Threading

BEFORE

the

SEWING

upper

thread

A

CAUTION

A

Turn This

Thread

Turn off The

machine

the

machine

will

make

the

threading

left-side

power

may

pulley

thread

switch

before

operateifthe

and

raise

the

easier

anditwill

first.

threading

treadleisdepressed

thread

take-up

prevent

the

upper

(1) before threading

the

thread

thread.

by mistake, which could result in injury.

the

upper

thread.

from coming

outatthe

sewing start.

21

T-8421B,

8422B,

8452B, 8722B,

8752B

<For

all

models

specifications

Do not

pass

thread

through.

<For

foundation

and

T-8452B-405>

Pass

the

thread

through.

(Refer

to p.37)

except

and

T-8452B-405>

the

specifications

foundation

Center

If

the

follows,

to

thread.

<Modeis

Press

<Models

Press or

lifter to

4.

PREPARATION

tension

the

thread

with

the

without

the

operate

raise

discs

thread

tension

thread

tension the

liftingleveror

the

presser

are

will

become

trimmer>

release

BEFORE

opened

plate (2).

trimmer>

plate (2),

the

foot.

SEWING

as

easier

knee

50mm

T-8421B

50mm

T-8422B,

50mm

8722B

50mm

T-8452B,

50mm

8752

50mm

The

thread

canbepassed

securely

inbetween the tension discs. r (2)

B

Pass

the

threadonthe

inside of

the

tab

(3).

T-8421B,

8422B,

8452B,

8722B,

8752B

3910M

22

4.

PREPARATION

4-6.

Adjusting

BEFORE

the

SEWING

stitch

iength

1. Unlock

2. Turn

3. Turn

the

stitch length dial (2) by turning

(1) to

the

right until a click is

the

stitch length dial (2) clockwise or counterclockwise

so that

the

desired stitch length is at

on

the

dial.

• The larger the number, the longer (The numbers on

length ofthe finished stitches may vary depending on the

type

and

thickness of material being sewn. Adjust while

looking at

• When turning the stitch length dial (2) from a larger

setting to a smallersetting, itwillbe

if the reverse lever (3) is pushed to the halfwaydown

position.

the

length dial (2).

Check that the stitch length dial (2)

the

dial lock lever (1) firmlyto

the

finished stitches.)

dial

heard.

are

the

uppermost position

the

stitch length

for

useasa guide.

easier

to turn

the

left to lock

does

not rotate.

dial lock lever

the

will

The

stitch

be.

dial

Locked

4-7.

Using

2907M

4-8. Using

Unlocked

the

knee

(1) (2)

thread

2906M

lifter

2908M

wiper (Models with

2909M

The presserfoot (2) can be raised by pressing the knee

plate

(1).

thread

Pressthe

After thread

pull up

the

trimmer only)

thread

wiper

switch

trimming

thread.

is carried out, the thread wiper (2)

(1)

tothe0

side.

lifter

will

2209M

2910M

23

T-8421B,

8422B, 8452B,

8722B,

8752B

4-9.

NOTE:

Ifusing this

use

Corner

the

procedures given below to stop

sewing

machine

in place of a single-needle machine, remove

method

(T-8452B,

the

unused

needle

8752B)

the

needle

which is not being

bar

from moving, otherwise

4.

PREPARATION

damagetothe

BEFORE

used.Insuch

machine may result.

SEWING

cases,

O

do not

o

4-9-1.

To

stop

the

needle

Needle

stop

bars

(right

and

JH

3128M

i

L-

I

O

CO

Needle

stop

3129M

left)

Operate

material

I

Do not

needle

<To

stop

Move

<To

stop

Move

<To

resume

Press

The stop lever (1)

automatically.

the

stop

lever after

and

has

stopped

sewatspeedsofover

bars

has

been

operationofthe

the

stop

lever (1) to

operationofthe

the

stop

lever (1) to the "R" position.

CO

O

twin-needle

the

push

lever (2).

will

the

needle

has

penetrated

the

moving.

1,000

rpm while

oneofthe

stopped.

left

needle

the

"L"position.

right

needle

bar>

sewing>

then return to its original position

4-9-2.

Numberofstitches:

Sewing angle 40° \

f

No.ofstitches6—-

<For

1/4"

needle

Push

width>

quick-reference

3131M

L

Sewing

No.of\|ngle

Stitches

2

3

4

5

6

7 8

4.8

4.0

3.7

3.0

3130M

40"

4.4

3.5

2.9 2.3

2.5

2.2

guide

50"

4.6

3.4

2.7

2.0

1.7

60" 70"

4.6

3.5

3.0

2.8

2.3

2.2

1.8 1.5 1.3

1.9

1.5

1.6

3.8

2.5

1.9

1.3

90" 100"

3.2

2.7

2.1 1.8

1.3

1.6

110"

2.2

1.5

120" 130"

1.8

1.2

Determine the stitch length from the chart above to make beautiful corner stitching.

The number of stitches of the outer needle varies according to the combination of sewing angle and stitch length.

[Example]

Fora sewing angle of 40° and a stitch length of 2.9 mm, the number ofstitches becomes 6.

T-8421B,

8422B,

8452B, 8722B,

8752B

1.5

1.1

24

5. USING

5.

THE

OPERATION

USING

THE

PANEL

(BASIC

OPERATIONS)

OPERATION

PANEL

(BASIC OPERATIONS)

5-1.

Names

• The operation panel keys cannot be operated while sewing is in progress. Select

the

• In the

when

case

the

and

functions

keys

and

set

the numberof stitches before starting sewing.

of keys with indicators, the indicator illuminates when that function is operating, and

key is

pressed

(16) (15)

once

more.

(12) (11)

the

indicator switches off

Power

indicator

(14) (17) (13) (5)

The

power indicator illuminates

(1) Main display

^LF—T ® E—P

8888

(2) Setting keys

® (a)

y) iyj

(3) Start backtack key

(4) End backtack key

Oa

88BB.:

fS

IvJ

m

(5) Continuous backtack key

O

LOCK

W

(9)

when

the

power is turned on.

• In

start

backtack

displayed.

• In end backtack display, CD illuminates and the number of stitches for C

displayed.

• In continuous backtack display, ABCD illuminates

andDare

• In fixed stitch display, E or F illuminates displayed.

numberoffixed

lyj •

W^en

displayed.

theAkeyispressed,

• Whenthe V keyis pressed, the settingdecreases

When

this key is

stitches

When

(0-99)intheAand

this key is

stitches (0-99) in the C and D stitch number displays is sewn. When the treadle is

depressed

thread is trimmed automatically.)

If

the

to ON, the number of stitches

When

backward, end backtacking is carried out. (For models with thread trimmer, the

treadle

has

this key is

(0-99) in theA,B, C and D stitch number displays is sewn continuously. The sewing

machine

sews

thread is trimmedautomatically.

display, AB illuminates

stitches

a single cycle of A, B, 0 and D,

forEand

pressedsothat

not yet

pressedsothat

been

numberofbacktack

F.

the

setting

the

B stitch number displays is sewn.

the

depressed

can

be changed and the function can be

the

indicator illuminates,

and

increases

indicator illuminates,

backward,

the

numberofstitches

and

the

number

the

numberofstitches

stitches

forA,B,CandDand

for A

of stitches for A, B, C

for E or F

from0upto99.

from99down

the

end

the

and

for models with thread trimmer, the

to0.

2137M

the

numberofstart

the

numberofend

backtack function

set

back to OFF.

numberofbacktack

(10)

and8are

andDare

2138M

backtack

canbeset

stitches

2135M

are

2136M

the

2139M

2140M

2141M

2142M

25

T-8421B,

8422B,

8452B, 8722B,

8752B

Fixed stitch key

(6)

o

Name

Pleat

label key

presser

sewing key

(7)

(8)

(9) Thread trimming key (Models with thread trimmer only)

tg^

(10) AUTO key

Hi

(11) Sewing

(12) Sewing

©

speed

control display

control keys

(SZg)e

When this key is pressed so that the indicator illuminates, the number of stitches (1-1999) inthe E stitch number display is sewn, and then the sewing machine stops automatically.

When this key is pressed so that the indicator illuminates, fixed stitch sewing of the number of stitches (1-1999) inthe E and F stitch number displays is carried out repeatedly.

When

this key is

(1-1999)inthe

• This can only be

pressedsothat

E stitch number display can be sewn by pressing the actuator.

set

for

(7).

•

When

this key is

(start or

trimmed automatically.

• This

stitch key (6) or

• When this key is

(start or

is then trimmed (models with

once.

This

shows

• Ifall

• Ifall bars

These

the

maximum

The

sewing

can

bars

keys

end

only be

end

the

are

let you

speed

pressedsothat

backtack stitches or fixed stitches)

set

for

the

name

pressedsothat

backtack stitches or fixed stitches)

sewing

amount.

speed

illuminated, it indicates

switched off, it indicates

adjust

can

alsobeadjusted

• When the • key is pressed, the sewingspeed becomes faster.

•

When

the

(13)

Thread

trimming lock key (Models with

(14) Half stitch key

®When

(15) Lower

(16) Lower

!0000

uOuu

thread

counter

•

When

the

depressed

• If

the

needle

stitches

the

pressing

display

This

shows

The

counterisreduced

keys

These

keys

^ key is

thread

this key is

needle

up position without

backward.

indicator of

up position without

have

sewing

this key.

the

are

pressed,

trimmer only)

pressedsothat

the

AUTO key (10) is illuminated,

been

sewn.

machine

lower

thread

by "1" for

usedtoset

the

indicator illuminates,

use

together with the fixed stitch key (6) or the

the

indicator illuminates,

use

together with the continuous backtack key (5), the fixed

label key (7).

the

indicator illuminates,

thread

trimmer only) simply by

when

the

sewing

is

counter

the

speed

the

sewing

the

thread

stopped,

value.

every

initial

value

treadle is

that

the

while sewing is in

indicator illuminates,

trimming being carried

the

ten

depressedtothe

the

maximum

minimum

thatisused

speed

becomes

trimming being carried out

needle

stitches

for

the

lower

the

numberofbacktack

are

sewn,

are

sewn automatically

speed

(220 rpm).

when

the

progress.

slower.

the

sewing

out

bar

can

be

sewn.

thread

counter.

the

set

numberofstitches

and

then

the

set

number

depressing

maximum amount.

canbeset.

treadleisdepressed

2149M

sewing

moved

evenifthe

machine

after

the

(Refer

machine

up

name

label key

the

thread is

of stitches

and

the

2150M

treadle

stopsinthe

set

number

and

down

to p.25.)

2143M

2144M

stitches

2145M

2146M

thread

treadle

2147M

2148M

2151M

stops

2152M

2153M

2154M

to

in

is

of

by

(ES)

(17)

RESET

key

This key is

conditions.

used

to retum

(Refer

to p.25.)

T-8421B, 8422B, 8452B, 8722B, 8752B

the

lower

thread

counter

to its initial value

andtocancel

2155M

warning

2156M

26

5.

USING

5-2.

THE

OPERATION

Sewing

start

2911M

PANEL

and

(BASIC

end

OPERATIONS

backtack

IL

stitches

1

Setting

start

end

backtack

stitches

ON

-i

stitches

ON

i:

Start

backtacking is carried out. After it

the

treadle

remains

NOTE:

If

the

treadleisreturnedtothe

operating

End backtacking is carried out. After it

(models with thread trimmer)

NOTE:

• If

the

treadle is

stitchesiscomplete,

• For models with

illuminated,

trimming

until

being

depressed.

the

set

numberofstart

depressed

thread

the

sewing

carried

and

the

backward before sewing of

end

backtacking will notbecarried out.

trimmer, if

machine

out.

S

ts

A(0-99)

B(0-99)

Vi IVJ IVJ

C(0-99)

has

finished, normal sewing continues foraslong

neutral position,

backtack

has

finished,

sewing machine

the

indicator of

will

stopinthe

I * I A

I*-*'

D(0-99)

stitches

the

stops

Example:

Example

the

sewing

has

thread

in the needle up position.

the

needle

machine

been

sewn.

is trimmed automatically

set

numberofstart

thread

trimming lock key is

up position without

will

2157M

2158M

as

continue

2159M

backtack

thread

2160M

27

T-8421B,

8422B,

8452B, 8722B,

8752B

5-3.

Sewing

fixed

2912M

5. USING THE OPERATION PANEL (BASIC OPERATIONS)

stitches

1

<Automatlc

thread

ON

i;

After the

stops

this, normal

After

and

trimming Press

continuously

(Models

the thread trimming key to turn on

set

number of stitches in E (fixed stitches) have

in the

needle

position that

sewing

the

treadle is

the

sewing machine switches to fixed stitch sewing mode.

with

depressed,

is carried

depressed

thread

has

been

outifthe

backward,

trimmer

trimming is carried

treadleisdepressed.

only)>

the

Example:

E^120

(1-19)

X

(0-99)

From1to

been

set

by the

needle

up/down key (refer to p.26). After

the

thread is trimmed (models with thread trimmer)

thread trimming function. When

out

after

the

fixed

stitches

1999

sewn,

have

stitches

the

been

canbeset.

sewing machine

the

sewn.

treadle

2161M

2159M

2160M

IS

<Automatlc

lEI

<Start

and

sewlng>

end

backtack

When the AUTO key is simply by depressing

sewlng>

The

start

backtack key

function.

If changing

temporarily turn off

the

numberofstitches

the

number of

pressed

the

treadle

the

T-8421B,

to turn on once

and

end backtack key

end

fixed stitch function before making

and

the

setting

8422B,

the

automatic sewing function,

without needing to

backtack stitches in C

can

thenbechanged.)

8452B,

8722B,

depress

canbepressed

8752B

it continuously.

and

the

to turn on

D,

press

change.

the

fixed stitches

the

backtack sewing

the

fixed stitch key to

(The CD display

are

will

sewn

show

28

5.

USING

THE

OPERATION

PANEL

(BASIC

OPERATIONS)

5-4.

•

Using

The

lower thread counter can be

the

lower

thread

used

counter

to let you know approximately how much lower thread is remaining.

• The value displayed by the lowerthread counter display is reduced by 1 fromthe

machine

<lnitlal

1

value

(Press

sews

10 stitches,

setting>

for 2

secondsormore)

and

a warning is given when the counter

After

about2seconds,

will

show

the

initial

value

When

the A

When

the •

Ifyou hold down

Ifa

value

The

initial setting

keyispressed,

of "0" is

the

set,

value

the

which

keys,

the

reaches

buzzer

was

the

lower

willbeaccepted

"-5".

will

sound

set

previously.

the

setting

the

setting

setting will

thread

initial

and

increases.

decreases.

change

counter

when

setting value each time the sewing

the

lower

thread

more

will

not

sewing

counter

quickly.

operate.

starts.

display

2166M

<Lower

(Initialvalue)

1.

When

(After

2.

When

3. After even

trimmer) and

thread

counter

operation>

Reduces

for

stitches

every

sewn

jjnn

LJUU

sewing is carried out,

the

value

reaches

the

value is "-5" or

the

treadle returns to the neutral position

ifthe treadle is

the

sewing

the

zero

"0",a minus sign

less,

depressed.

machine

value

a warning icon (1) illuminates

However, ifthe treadle is

stopsinthe

by 1

10

showninthe

appears

and

needleupstop

lower

thread

counter

and

counting continues to a maximum of "-999".)

and

an electronic

the

sewing machine stops,

depressed

position.

2167M

2168M 2169M

Press

the

RESET key (2).

|(Q)

Press

the

(2) for2 seconds or more.

RESET

display is

reduced

buzzer

sounds

the

sewing machine

backward, the thread is trimmed (models with thread

key (2)

by 1 for every 10 stitches

for 5

seconds.

will

not start up again

2170M

sewn.

• If you

• Ifyou

29

press

depressed.

press

the

RESET key (2), the warning icon (1)

and

hold the RESET key (2) for 2

T-8421B,

seconds

8422B,

will

or more,

8452B,

disappear

the

display

8722B,

and

sewing

will

8752B

will

return to the initialvalue.

be possible when

the

treadle is

^JSIN^IJEOPERATlO^ANEyADVANCEDOra

6.

USING

THE

OPERATION

(ADVANCED OPERATIONS)

The

6-1.

operations

Names

described

and

in this

section

functions

(23) (21) (19)

should

only be carried

PANEL

out

by a technician.

brother

®

(18)

Slow

start

(20) Correction

!OQOO

QQQQ

:t

key

O O O O 0 Q O O ^

l-UUUU

a

© ©

©-©-©

(24) (18) (20) (22)

When this key is pressed so that the slow start icon (19) illuminates, the first two

stitches

700rpm. After this, the sewing

Ifyou press this key again whilethe icon (19)is illuminated, the icon (19)

• When this key is pressed so that the correction icon (21) illuminates, correction sewing

canbecarried

Ifthe sewing machine is stopped, sewing

while

NOTE:

• Ifyoupress this key again whilethe icon (21) is illuminated, the icon (21)

that

are

sewn

immediately

speed

out.

the

actuator

• If you press the actuator while sewing is in progress, backtack stitches

sewn.

• Correction sewing sewing key (8) is illuminated.

Is being

pressed.

cannot

©-(g)

These

operating

They

after

be carried out while

are

settings.

should

the

treadleisdepressed

corresponds to the treadle depression amount.

will

©©

used

for making

only be

be carried out at slow speed (250 rpm)

used

the

indicator of the pleat

advanced

by a technician.

backward

will

are

turn

(8)

sewn

will

presser

2171M

at

off.

2172M

be

off.

(22)

Needle

up/down key

Use this key to select whether the needle bar stops inthe up position or the down position

when

the

•

treadleisreturnedtothe

When

the

needleupiconJ.(23)isilluminated,

When

the needle

position.

T-8421B, 8422B,

down

icon

8452B,

-I- (24) is

neutral position

illuminated,

8722B,

8752B

and

sewing

the

needle

the needle bar stops in the

stops.

barstopsinthe up

2207M

2208M

2173M

position.

down

2174M

30

6. USING THE OPERATION

6-2,

Adjusting

8888

® ©

the

PANEL

needle

(1) (:

(ADVANCED

up

stop

(-10-20)

W w

) (4)

OPERATIONS)

position

2210M

1. While pressing

2. "n.O

3. Press theA or V

4.

power

switch.

XX"

will

("xx"isthe and

"0" is

for

the

needleupstop

•Ifyou

up to 20

lower.

•Ifyou

down to -10

become

Press

the

A long

change

the

buzzer

to stitch

needleupstop

the

needle

appearinthe

setting value for

the

default setting.)

press

the A

and

the

up/down key (1), turn on

main display (2).

the

key

(3)

to change the

position.

key,

the

needleupstop

presstheVkey, the

and

the

needle up

higher.

ENTER key (4) for two

will

sound

and

number

display mode. (This

position setting.)

needleupstop

position,

setting

value

will

increase

position will

setting

value

will

decrease

stop

position

seconds

the main display (2)

or more.

completes

the

value

become

will

ro)

6-3. LOCK

I a a a

key

(2)

Becomes

higher

lower

2913M

A setting value of "10" of approximately 10° for

When the power switch is turned on, the LOCKkey (1) turns ON. (The icon (2) is illuminated.)

In this

state,

the

following

that setting values cannot be

FUNG key (3)

This key is

ENTER key (4)

This key is used to

MAXkey (5)

This key is used to

* Refer to the Service Manual for details on using these

keys.

used

corresponds

the

upper

three

changed

to make settings for various functions.

accept

function settings.

change

the maximum sewing

key

to an

angle

shaft.

operations

accidentally.

2138M

are

of rotation

2139M

invalid

speed.

so

@1601

(3) (4) (5) (

2212M

6-4.

Resetting

Whileholding down the RESET key, turn on the power switch. Ifyou press the ENTER key, the settings

Once

the

settings

default settings.

Once the above display appears, normaloperation

31

have

all

settings

been

reset,

"iniT

to

their

will

then be reset.

ALL"

appearsinthe

T-8421B,

defaults

display

will

then be possible.

8422B,

8452B, 8722B,

and

the

operation

8752B

panel

settings

are

resettotheir

factory

7.

SEWING

A

CAUTION

7.

SEWING

A A

A

7-1.

Attach all safety devices before using the sewing machine. Ifthe machine is used without

injury may result.

Turn offthe power switch at the

following

times.

The machine may operate ifthe treadle is depressed by mistake, which could result in

• When threading the

•

When

replacing

• When not using the machine and when leaving the machine unattended

Do not touch any of the moving parts or

personal injury or

Use both is used, the weight of the machine

hands

needle

the

bobbin

and

damagetothe

to hold the machine

machine.

needle

head

press

any objects against the machine while sewing,asthis may result in

when tilting it back or returning it to its original position. Ifonly

may

cause

your hand to slip, and your hand may

Sewing

Lower

thread

2914M

1. While holding

the

machine

threads

2. Pull

the

out

smoothly.

come

lower

the

two

pulley by

out

onto

threads

upper

hand

the

feed

toward you

these

devices attached,

injury.

get

caught.

threads

with your fingers, turn

toward you until

dog.

and

check

one

that

hand

the

lower

they pull

Lower

thread

2915M

2114M

3.

Press

The

power indicator (2)

4.

Use

the

which is

(Refer to

5.

Depress

theONpower

operating panel to carry

necessary

the

chapter

the

treadletostart

switch (1).

and

for sewing.

on "5. using

(3) willilluminate.

out

the

operating panel".)

sewing.

programming

2893M

T-8421B,

8422B,

8452B,

8722B,

8752B

32

7.

SEWING

7-2.

Backtacking

2916M

2917M

When the actuator (1) or the reverse lever (2) is during sewing, the feed direction

released,

the

feed

direction will

will

be reversed. When it is

returntonormal.

pressed

2918M

<Actuator

The

actuator

illustration.

rotation

can

Select

function>

be

rotated 90

the

position (A or B) that is

degrees

as

shownInthe

easiertouse.

33

T-8421B,

8422B,

8452B,

8722B,

8752B

7-3.

Sewing

condensed

I

Sewing

stitches

direction

Ifyou

press

the actuator (1) or the reverse lever (2) while

sewing is in progress, you

direction) with small stitch lengths.

Before carrying out sewing,

condensed

stitches

as

can

set

foliows.

7.

SEWING

sew

stitches (fonward

the stitch length for

Locked

Unlocked

Condensed

stitches

2919M

2920M

1. Unlock

lever (3) to

2. Turn

used

3. Loosen

touches

4. Tighten

1. Return

normal sewing.

2. Turn

stitch length dial (4).

3.

Start

4. At condensed

lever

the

stitch length dial (4) by turning

the

right.

the

stitch length dial (4) to

for

condensed

the

screw

the

reverse

the

screw

the

stitch length dial (4) to

the

dial lock lever (3) firmly to the left to lock

sewing.

the

position

stitches,

(2).

(Condensed stitches reverse

lever (2) is being

To stop sewing

backtack function, lower

the

touch

reverse

the

stitches.

(5)

and

lift up

the

stitching

(5) to

where

press

lever

plate

secure

the

stopper

you would like to

the

actuator

are

sewn while the actuator (1) or

pressed.)

condense

stitching lever plate (7).

stitches

the

and

stopper

the

dial lock

stitch length to be

stopper

(7).

the

(1) or

(6) until it

(6).

stitch length for

start

sewing

the

reverse

return to using the

(6)sothatitdoes

the

not

292IM

T-8421B,

8422B,

8452B,

8722B,

8752B

34

Brother T-8421B, T-84228, T-8722B, T-8452B, T-8752B Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual