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T-8421C, 8422C Basic Operation Manual
T-8452C, 8722C T-8752C
TWIN NEEDLE DIRECT DRIVE LOCK STITCHER
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
This basic operation manual describes basic operations including sewing machine operations.
For cleaning, standard adjustments and more details, please refer to the instruction manual contained in the Document CD.
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.
T-8421C, 8422C, 8452C, 8722C, 8752C
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
DANGER
CAUTION
Symbols
The instructions which follow this term indicate situations where failure to follow the instructions may result in death or serious injury.
The instructions which follow this term indicate situations where failure to follow the instructions could cause injury when using the machine or physical damage to equipment and surroundings.
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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”.)
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-8421C, 8422C, 8452C, 8722C, 8752C |
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[2] Notes on safety
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the cover of the control box. Touching areas where high voltages are present can result in severe injury.
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.
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
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 50 kg (110 lb). 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.
Turn off the power switch before inserting or removing the plug, otherwise damage to the control box could result.
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.
When securing the cords, do not bend the cords excessively or fasten them too hard 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.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
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.
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T-8421C, 8422C, 8452C, 8722C, 8752C |
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 machine may operate if the treadle is depressed by mistake, which could result in injury.
yWhen threading the needle
yWhen replacing the bobbin and needle
yWhen 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.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
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 operation, 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.
Cleaning
Turn off the power switch before carrying out cleaning. The machine may operate if the treadle is depressed by mistake, which could result in injury.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
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.
Use only the proper replacement parts as specified by Brother.
Maintenance and inspection
Maintenance and inspection of the sewing machine should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to carry out any maintenance and inspection of the electrical system.
Turn off the power switch and disconnect the power cord from the wall outlet at the following times, otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury.
yWhen carrying out inspection, adjustment and maintenance
yWhen replacing consumable parts such as the rotary hook
If the power switch needs to be left on when carrying out some adjustment, be extremely careful to observe all safety precautions.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
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.
Use only the proper replacement parts as specified by Brother.
If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine.
Any problems in machine operation which result from unauthorized modifications to the machine will not be covered by the warranty.
T-8421C, 8422C, 8452C, 8722C, 8752C |
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[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.
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Touching areas where high voltages are present can |
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Be careful not to get your hands |
result in severe injury. Turn off the power before |
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opening the cover. |
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machine head to its original |
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position after it has been tilted. |
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*Safety devices: (A) Finger guard
(B)Thread take-up cover
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Be sure to connect the ground. If |
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the ground connection is not |
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secure, you run a high risk of |
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serious electric |
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shock, and problems with correct |
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operation may also occur. |
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Direction of operation |
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Oil pan
Control box
Transformer box (100V/400V system only)
2166B
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2506B |
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Oil tank |
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T-8421C, 8422C, 8452C, 8722C, 8752C |
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CONTENTS
1. USEFUL FUNCTIONS FOR OPTIMUM |
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6. SEWING ............................................... |
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SEWING................................................ |
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6-1. Sewing ............................................................ |
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2. NAMES OF MAJOR PARTS |
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6-2. Backtacking..................................................... |
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3. INSTALLATION.................................... |
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3-1. Table processing diagram .............................. |
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3-2. Installation ...................................................... |
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3-3. Lubrication ...................................................... |
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3-4. Connecting the cords...................................... |
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3-4-1. Opening the control box cover ............ |
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3-4-2. Connecting the cords .......................... |
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3-5. Test operation (Operating the treadle) ........... |
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3-6. Adjusting the treadle operation....................... |
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4. PREPARATION BEFORE SEWING..... |
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4-1. Installing the needle........................................... |
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4-2. Removing the bobbin...................................... |
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4-3. Winding the lower thread................................ |
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4-4. Installing the bobbin........................................ |
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4-5. Threading the upper thread............................ |
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4-6. Adjusting the stitch length............................... |
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4-7. Using the knee lifter........................................ |
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4-8. Using the thread wiper |
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(models with thread trimmer only) .................. |
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4-9. Corner sewing method (T-8452C, 8752C) ..... |
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4-9-1. To stop the needle bars |
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(right and left) ..................................... |
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4-9-2. Number of stitches: quick-reference |
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guide ................................................... |
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5. USING THE G50 OPERATION PANEL |
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(BASIC OPERATIONS)........................ |
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5-1. Names and functions...................................... |
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5-2. Sewing start and end backtack stitches ......... |
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T-8421C, 8422C, 8452C, 8722C, 8752C
1. USEFUL FUNCTIONS FOR OPTIMUM SEWING
1. USEFUL FUNCTIONS FOR OPTIMUM SEWING
Thread take-up amount can be adjuste
INSTRUCTION MANUAL CD
10-5. Adjusting the thread take-up amount
Depending on the material and thread used, you can reduce the thread take-up amount to suit the material and thread being used by threading the thread through the thread amount adjuster (1).
This can be useful if sewing with light material or if using slippery thread such as polyester thread.
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Selectable starting speed |
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The sewing speed at the sewing start can be |
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selected in accordance with the treadle |
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depression amount. You can set the speed |
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according to the preferences of the operator. |
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(Contact the place of purchase.) |
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Easy setting of sewing speed |
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< G50 |
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from operation panel |
operation panel > |
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< When using the G50 operation panel > |
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Page 27 |
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The sewing speed can be adjusted using the |
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sewing speed control keys. |
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< When using the G10 operation panel > |
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INSTRUCTION MANUAL CD |
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8-5. Setting the maximum sewing |
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speed |
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The sewing speed can be adjusted using the |
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MAX key. |
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2511B
Actuator switch
Page 30
The actuator switch can be rotated 90 degrees as shown in the illustration. Select the position (A or B) that is easier to use.
Condensed stitching
INSTRUCTION MANUAL CD 9-3. Sewing condensed stitches
This feature is ideal for use when sewing thin materials that can easily pucker when reverse stitches are sewn. Condensed stitches have a smaller sewing pitch and they help prevent
fraying.
Sewing direction
Condensed stitches
2512B
Floating presser foot for easy handling
INSTRUCTION MANUAL CD
10-3. Adjusting the presser foot floating amount (minute lifting amount)
A micro-adjustable type floating presser foot is equipped as |
2513B |
standard. This device is ideal for controlling presser foot floating in materials that stretch easily and materials with long pile. It prevents seam slippage and also prevents damage to the material. In addition, three-dimensional articles with irregular curves can also be handled with ease.
T-8421C, 8422C, 8452C, 8722C, 8752C |
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2. NAMES OF MAJOR PARTS
2. NAMES OF MAJOR PARTS
G50 operation panel (advanced function LCD)
G10 operation panel (basic function LED)
2168B
(1) |
Bobbin winder |
(2) |
Thread wiper (T-8422C, 8452C, 8722C, 8752C) |
(3) |
Lifting lever |
(4) |
Quick reverse (Actuator switch) |
(5) |
Presser foot |
(6) |
Control box |
(7) |
Knee lifter assembly |
(8) |
Power switch |
(9) |
Stitch length dial |
(10) |
Reverse lever |
(11) |
Oil gauge window |
(12) |
Machine pulley |
(13) |
Operation panel |
(14) |
Cotton stand |
(15)Stop lever (T-8452C, 8752C )
Safety devices |
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(16) Thread take-up cover |
(17) Finger guard |
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T-8421C, 8422C, 8452C, 8722C, 8752C |
3. INSTALLATION
3. 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 more than 50 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.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
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.
About the machine set-up location
Do not set up this sewing machine near other equipment such as televisions, radios or cordless telephones, otherwise such equipment may be affected by electronic interference from the sewing machine.
The sewing machine should be plugged directly into an AC wall outlet. Operation problems may result if extension cords are used.
2086M
Carrying the machine
The machine should be carried by the arm by two people as shown in the illustration.
*Hold the motor cover (A) by hand also so that the pulley does not rotate.
2169B
Tilting back the machine head
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.
2871M
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.
2872M
T-8421C, 8422C, 8452C, 8722C, 8752C |
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3. INSTALLATION
3-1. Table processing diagram
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.
Drill holes as indicated in the illustration below.
Cotton stand hole
Cord hole
Head rest hole
Control box mounting hole
2170B
3-2. Installation
1. Control box
(1) Control box
(2) Bolts [3 pcs]
(3) Nuts [3 pcs]
(4) Spring washers [3 pcs]
(5) Washers [3 pcs]
2. Connecting rod
(6) Connecting rod
(7) Nut
4127M
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T-8421C, 8422C, 8452C, 8722C, 8752C |
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