Brother FB-V41A, FB-V51A, HE-800A, KE-430D, KE-430F Owner's Manual

T-8420B

TWIN NEEDLE LOCK STITCHER

T-8450B

TWIN NEEDLE SPLIT NEEDLE BAR LOCK STITCHER

T-8720B

TWIN NEEDLE LOCK STITCHER WITH LARGE HOOK

T-8750B

TWIN NEEDLE SPLIT NEEDLE BAR LOCK STITCHER

WITH LARGE HOOK

Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please read the safety instructions below and the explanations given in the instruction manual.

With industrial sewing machines, it is normal to carry out work while positioned directly in front of moving parts such as the needle and thread take-up, and consequently there is always a danger of injury that can be caused by these parts. Follow the instructions from training personnel and instructors regarding safe and correct operation before operating the machine so that you will know how to use it correctly.

SAFETY INSTRUCTIONS

1. Safety indications and their meanings

This instruction manual and the indications and symbols that are used on the machine itself are provided in order to ensure safe operation of this machine and to prevent accidents and injury to yourself or other people.

Indications

The instructions which follow this term indicate situations where failure to follow the

CAUTION

Symbols

· · · · ·

This symbol ( ) indicates something that you should be careful of. The picture inside the triangle indicates the nature of the caution that must be taken. (For example, the symbol at left means “beware of injury”.)

instructions could cause injury when using the machine or physical damage to equipment and surroundings.

· · · · ·

This symbol ( ) indicates something that you must not do.

This symbol ( ) indicates something that you must do. The picture inside the circle indicates the nature of the thing that must be done. (For example, the symbol at left means “you must make the ground connection”.)

T-8420B, 8450B, 8720B, 8750B

i

2. Notes on safety

CAUTION

Environmental requirements

Use the sewing machine in an area which is free from sources of strong electrical noise such as electrical line noise or static electric noise. Sources of strong electrical noise may cause problems with correct operation.

Any fluctuations in the power supply voltage should be within ±10% of the rated voltage for the machine. Voltage fluctuations which are greater than this may cause problems with correct operation.

The power supply capacity should be greater than the requirements for the sewing machine's power consumption. Insufficient power supply capacity may cause problems with correct operation.

Machine installation should only be carried out by a qualified technician.

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

The sewing machine weighs approximately 43 kg. The installation should be carried out by two or more people.

Do not connent the power cord until installation is complete. The machine may operate if the treadle is depressed by mistake, which could result in injury.

Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a serious electric shock, and problems with correct operation may also occur.

The ambient temperature should be within the range of 5°C to 35°C during use. Temperatures which are lower or higher than this may cause problems with correct operation.

The relative humidity should be within the range of 45% to 85% during use, and no dew formation should occur in any devices. Excessively dry or humid environments and dew formation may cause problems with correct operation.

In the event of an electrical storm, turn off the power and disconnect the power cord from the wall outlet. Lightning may cause problems with correct operation.

Installation

All cords should be secured at least 25 mm away from any moving parts. Furthermore, do not excessively bend the cords or secure them too firmly with staples, otherwise there is the danger that fire or electric shocks could occur.

If using a work table which has casters, the casters should be secured in such a way so that they cannot move.

Use both hands to hold the machine head when tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.

Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not get into your eyes or onto your skin, otherwise inflammation can result. Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause vomiting and diarrhea. Keep the oil out of the reach of children.

ii

T-8420B, 8450B, 8720B, 8750B

CAUTION

Sewing

This sewing machine should only be used by operators who have received the necessary training in safe use beforehand.

The sewing machine should not be used for any applications other than sewing.

Be sure to wear protective goggles when using the machine. If goggles are not worn, there is the danger that if a needle breaks, parts of the broken needle may enter your eyes and injury may result.

Turn off the power switch at the following times. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work. The machine may operate if the treadle is depressed by mistake, which could result in injury.

y When threading the needle y When replacing the bobbin and needle y When not using the machine and when leaving

the machine unattended

If using a work table which has casters, the casters should be secured in such a way so that they cannot move.

Attach all safety devices before using the sewing machine. If the machine is used without these devices attached, injury may result.

Do not touch any of the moving parts or press any objects against the machine while sewing, as this may result in personal injury or damage to the machine.

Use both hands to hold the machine head when tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.

If an error occurs in machine, or if abnormal noises or smells are noticed, immediately turn off the power switch. Then contact your nearest Brother dealer or a qualified technician.

If the machine develops a problem, contact your nearest Brother dealer or a qualified technician.

Turn off the power switch before carrying out cleaning. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work. The machine may operate if the treadle is depressed by mistake, which could result in injury.

Use both hands to hold the machine head when tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.

Cleaning

Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not get into your eyes or onto your skin, otherwise inflammation can result. Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause vomiting and diarrhea. Keep the oil out of the reach of children.

Use only the proper replacement parts as specified by Brother.

T-8420B, 8450B, 8720B, 8750B

iii

3.Warning labels

The following warning labels appear on the sewing machine. Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are difficult to read, please contact your nearest Brother dealer.

1

2

3

Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a serious electric shock, and problems with correct operation may also occur.

Direction of operation

Safety devices:

(A) Finger guard (B) Thread take-up cover (C) Belt cover

Oil pan

2955M

2954M

iv

2956M

T-8420B, 8450B, 8720B, 8750B

1. NAMES OF MAJOR PARTS

(1) Bobbin winder (2) Lifting lever (3) Presser foot (4) Knee lifter assembly (5) Stitch length dial (6) Reverse lever (7) Oil gauge window (8) Machine pulley (9) Alarm display (semi dry type) (10) Cotton stand

(11) Stop lever (T-8450B, 8750B)

Safety devices

(12) Thread take-up cover (13) Finger guard (14) Belt cover

2957M

1

T-8420B, 8450B, 8720B, 8750B

2. MACHINE SPECIFICATIONS

F 3 5

For light-weight and

Use For foundation

0 3

Lubrication type Minimum lubrication Semi dry

2 5

Stitch function Fixed needle bar Split needle bar

4 7 Rotary hook Standard hook Large hook

T-8420B

-00F -03F -003 -033 -005 Max. sewing speed 4,000 rpm 3,000 rpm 4,000 rpm 3,000 rpm 3,000 rpm Max. stitch length 4 mm 5 mm

Lifting lever 7 mm Presser foot

height Feed dog height 1 mm Needle (DP×5)

T-8720B, 8750B

-003 -005 Max. sewing speed 3,000 rpm Max. stitch length 7 mm

height Feed dog height 1 mm Needle (DP×5)

T-8450B

-003 -005 Max. sewing speed 3,000 rpm Max. stitch length 5 mm

height Feed dog height 1 mm Needle (DP×5)

Knee lifter 13 mm

#9–#14 #11–#16 #14–#22

Lifting lever 7 mm Presser foot Knee lifter 13 mm

#11–#16 #14–#22

Lifting lever 7 mm Presser foot Knee lifter 13 mm

#11–#16 #14–#22

medium- weight

materials

For heavy-weight

materials

T-8420B, 8450B, 8720B, 8750B

2

3. TABLE AND MOTOR

A. Table processing diagram

y The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and with-stand the

vibration of the sewing machine.

y Drill holes as indicated in the illustration below.

B. Motor

Ground wire hole

Head rest hole

Motor mounting holes

Cotton stand hole

2958M

CAUTION

All cords should be secured at least 25 mm away from any moving parts. Furthermore, do not excessively bend the cords or secure them too firmly with staples, otherwise there is the danger that fire or electric shocks could occur.

<Motor>

・ Use one of the clutch motors given in the table at right as the motor. ・ Refer to the instruction manual for the motor for details on installing

and using the motor.

Select the correct motor pulley and V-belt by referring to the table below to suit the power frequency of your area.

Sewing speed Frequency Motor pulley (Outer diameter) V-belt

4,000 rpm

3,500 rpm

3,000 rpm

50 Hz Motor pulley 100 46 60 Hz Motor pulley 85 45 50 Hz Motor pulley 90 45 60 Hz Motor pulley 70 44 50 Hz Motor pulley 75 44 60 Hz Motor pulley 65 43

Power Motor

Single-phase 2-pole, 400 W motor

Three-phase 2-pole, 400 W motor

3

T-8420B, 8450B, 8720B, 8750B

4. INSTALLATION

CAUTION

Machine installation should only be carried out by a qualified technician.

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

The sewing machine weighs approximately 43 kg. The installation should be carried out by two or more people.

Do not connect the power cord until installation is complete. The machine may operate if the treadle is depressed by mistake, which could result in injury.

Carrying the machine

y The machine should be carried by the arm by two people as

shown in the illustration.

* Make sure that the machine pulley does not turn.

4. INSTALLATION

Use both hands to hold the machine head when tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.

Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a serious electric shock, and problems with correct operation may also occur.

2959M

Tilting back the machine head

y Hold section (B) with your foot so that the table does not move,

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

Returning the machine head to the upright position

1. Clear away any tools, etc. which may be near the table holes.

2. While holding the face plate with your left hand, gently return the machine head to the upright position with your right hand.

2871M

2872M

T-8420B, 8450B, 8720B, 8750B

4

4. INSTALLATION

4-1. Installation

2874M

2875M

2960M

1. Oil pan

(1) Head cushions (left) [2 pcs] (2) Head cushions (right) [2 pcs] (3) Oil pan (4) Oiler

2. Rubber cushions

(1) Rubber cushions [2 pcs] (2) Nails [4 pcs]

3. Knee lifter complying bar

(3) Knee lifter complying bar

4. Machine head

(1) Hinges [2 pcs] (2) Machine head (3) Head rest

NOTE:

Tap the head rest (3) securely into the table hole. If the head rest (3) is not pushed in as far as it will go, the machine head will not be sufficiently stable when it is tilted back.

5

T-8420B, 8450B, 8720B, 8750B

4. INSTALLATION

5. Knee lifter plate

(1) Knee lifter plate (2) Bolt

* Loosen the bolt (3) and the bolt (4),

and move the knee lifter plate (1) to a position where it is easy to use.

1. Turn the machine pulley so that the feed dog is below the top of the needle plate.

2. Lower the presser foot (5) by using the lifting lever (4).

2962M

2881M

3. Loosen the nut (6).

4. Turn the screw (8) to adjust so that the amount of play in the knee lifter (7) is approximately 2 mm when the knee lifter plate (1) is gently pressed.

5. Securely tighten the nut (6).

6. Loosen the nut (9).

7. Turn the screw (10) 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 adjust so that the presser foot (5) is at the desired position within a distance of 13 mm of the needle plate when the knee liter plate (1) is fully pressed.

9. After adjustment is completed, securely tighten the nut (9).

2961M

Within 13 mm

2963M

T-8420B, 8450B, 8720B, 8750B

6

A

r

4. INSTALLATION

Ground symbol

lign horizontally to the

right and then tighten.

Moto

Oil pan

Moto

6. Ground wire

(1) Ground wire (2) Screw

Be sure to connect the accessory ground wire (1) to the motor.

< Minimum lubrication type>

Use a suitable ground wire.

2964M

7. Ground wire

Use a suitable ground wire. (1) Ground wire (2) Screw

2965M

Ground wire

2966M

8. V-belt

(1) V-belt

Turn the two nuts (2) to adjust so that there is 10-14 mm of deflection in the V-belt (1) when it is pressed at the midway point with a force of 5 N.

9. Belt cover bracket

(1) Belt cover bracket (2) Screws [2 pcs]

2967M

7

T-8420B, 8450B, 8720B, 8750B

2968M

10. Belt cover U

4. INSTALLATION

(1) Belt cover U (2) Screws [4 pcs]

Insert the projecting part underneath the machine pulley.

2969M

T-8420B, 8450B, 8720B, 8750B

11. Belt cover D

(1) Belt cover D (2) Wood screws [2 pcs] (3) Washers [2 pcs]

2970M

8

Brother FB-V41A, FB-V51A, HE-800A, KE-430D, KE-430F Owner's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SAFETY INSTRUCTIONS

CONTENTS

1. NAMES OF MAJOR PARTS

2. MACHINE SPECIFICATIONS

3. TABLE AND MOTOR

4. INSTALLATION

4-1. Installation