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Brother T-8422A Instruction Manual

Twin needle direct drive lock stitcher, twin needle direct drive lock stitcher with thread trimmer, twin needle direct drive split needle bar lock stitcher with thread trimmer, twin needle direct drive lock stitcher with large hook and thread trimmer, twi
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T-8421A
TWIN NEEDLE DIRECT DRIVE LOCK STITCHER
T-8422A
TWIN NEEDLE DIRECT DRIVE LOCK STITCHER
WITH THREAD TRIMMER
T-8452A
TWIN NEEDLE DIRECT DRIVE SPLIT NEEDLE BAR
LOCK STITCHER WITH THREAD TRIMMER
T-8722A
TWIN NEEDLE DIRECT DRIVE LOCK STITCHER
WITH LARGE HOOK AND THREAD TRIMMER
T-8752A
TWIN NEEDLE DIRECT DRIVE SPLIT NEEDLE BAR
LOCK STITCHER WITH LARGE HOOK
AND THREAD TRIMMER

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  Summary of Contents for Brother T-8422A

  • Page 1 T-8421A TWIN NEEDLE DIRECT DRIVE LOCK STITCHER T-8422A TWIN NEEDLE DIRECT DRIVE LOCK STITCHER WITH THREAD TRIMMER T-8452A TWIN NEEDLE DIRECT DRIVE SPLIT NEEDLE BAR LOCK STITCHER WITH THREAD TRIMMER T-8722A TWIN NEEDLE DIRECT DRIVE LOCK STITCHER WITH LARGE HOOK AND THREAD TRIMMER...
  • Page 2: Safety Instructions

    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.
  • Page 3 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 face plate of the control box. Touching areas where high voltages are present can result in severe injury.
  • Page 4 CAUTION Sewing This sewing machine should only be used by Attach all safety devices before using the sewing operators who have received the necessary training machine. If the machine is used without these in safe use beforehand. devices attached, injury may result. Do not touch any of the moving parts or press any The sewing machine should not be used for any objects against the machine while sewing, as this...
  • Page 5: Warning Labels

    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. Be sure to connect the ground.
  • Page 6: Table Of Contents

    CONTENTS 1. MACHINE SPECIFICATIONS ....7. SEWING ..........7-1. Sewing............32 2. NAMES OF MAJOR PARTS....7-2. Backtacking ............33 3. INSTALLATION........7-3. Sewing condensed stitches ......34 3-1. Table processing diagram ......5 8. THREAD TENSION ......3-2. Installation ............5 8-1. Adjusting the thread tension ......35 3-3.
  • Page 7: Machine Specifications

    1. MACHINE SPECIFICATIONS 1. MACHINE SPECIFICATIONS A B C D E F Rotary hook Standard hook Large hook Stitch function Fixed needle bar Split needle bar Thread trimmer ○ Quick reverse ○ ○ Thread wiper ○ Lubrication type Minimum lubrication Semi dry For light-weight and For foundation...
  • Page 8 Knee lifter 13 mm Feed dog height 1 mm Needle (DP×5) #9–#14 #11–#16 #14–#22 Motor AC servo motor (4-pole, 550W) Control circuit Microprocessor T-8422A -403 -433 -405 Max. sewing speed 4,000 rpm 3,000 rpm Start backtacking continuous 250–1,800 rpm backtacking speed...
  • Page 9: Names Of Major Parts

    (13), and so this panel is not used. (Settings made using this panel will not affect sewing machine operation.) 2869M Bobbin winder Thread wiper (T-8422A, 8452A, 8722A, 8752A) Lifting lever Quick reverse (Actuator) Presser foot Control box Knee lifter assembly...
  • Page 10: Installation

    3. INSTALLATION 3. INSTALLATION CAUTION Machine installation should only be carried out by a Do not connect the power cord until installation is qualified technician. complete. The machine may operate if the treadle is depressed by mistake, which could result in injury. Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done.
  • Page 11: Table Processing Diagram

    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...
  • Page 12: Power Switch

    3. INSTALLATION 3. Power switch (1) Power switch (2) Screws [2 pcs] Operator 2092M 4. Oil pan (1) Head cushions (left) [2 pcs] (2) Head cushions (right) [2 pcs] (3) Oil pan (4) Oiler 2874M 5. Rubber cushions (1) Rubber cushions [2 pcs] (2) Nails [4 pcs] 6.
  • Page 13: Machine Head

    3. INSTALLATION 7. 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.
  • Page 14 3. INSTALLATION 10. 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. 2879M <Knee lifter adjustment> 1.
  • Page 15: Lubrication

    3. INSTALLATION 3-3. Lubrication CAUTION Do not connect the power cord until lubrication has been completed, otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury. 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.
  • Page 16 3. INSTALLATION ■ Lubrication Apply 1 - 2 drops of oil to the places indicated by the arrows. 2885M <Minimum lubrication type only> * Do not apply oil for semi dry types. <T-8452A, 8752A> <Semi dry type and minimum lubrication type> Rotary hook race (left and right) 2886M...
  • Page 17: Connecting The Cords

    3. INSTALLATION 3-4. Connecting the cords DANGER 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 areas where high voltages are present can result in severe injury.
  • Page 18 3. INSTALLATION (1) 7-pin head detector unit connector (2) 10-pin operating panel connector (3) 14-pin encoder connector (4) 14-pin machine connector Refer to the following page for the 4-pin motor connector. Push in securely until the tabs (5) engage. 3131M 2.
  • Page 19: Other Cords

    3. INSTALLATION 3. Other cords 2890M (1) 6-pin power supply connector (2) 4-pin motor connector (3) Wire clip (4) Power cord <For single-phase specifications> Insert the power cord plug (5) into a wall outlet. <For three-phase specifications> 1. Attach an appropriate plug to the power cord (4).
  • Page 20 3. INSTALLATION 4. Ground wire (1) Ground wire (2) Screw [With washer] (3) Screw Ground symbol NOTE: Always be sure to connect the ground wire (1), otherwise problems may occur with sewing machine operation. Oil pan 2892M T-8421A, 8422A, 8452A, 8722A, 8752A...
  • Page 21: Test Operation (Operating The Treadle)

    3. INSTALLATION 3-5. Test operation (Operating the treadle) CAUTION 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. <Turning on the power> 2114M Press the ON power switch (1).
  • Page 22: Preparation Before Sewing

    4. PREPARATION BEFORE SEWING 4. PREPARATION BEFORE SEWING 4-1. Installing the needle CAUTION Turn off the power switch before installing the needle. The machine may operate if the treadle is depressed by mistake, which could result in injury. 1. Turn the machine pulley to move the needle bar to its <T-8421A, 8422A, 8722A>...
  • Page 23: Removing The Bobbin

    4. PREPARATION BEFORE SEWING 4-2. Removing the bobbin CAUTION Turn off the power switch before removing the bobbin. The machine may operate if the treadle is depressed by mistake, which could result in injury. <Latch type> 1. Open the slide plates (1) by moving them to the right and left.
  • Page 24: Winding The Lower Thread

    4. PREPARATION BEFORE SEWING 4-3. Winding the lower thread CAUTION Do not touch any of the moving parts or press any objects against the machine while winding the lower thread, as this may result in personal injury or damage to the machine. 1.
  • Page 25: Installing The Bobbin

    4. PREPARATION BEFORE SEWING 4-4. Installing the bobbin CAUTION Turn off the power switch before installing the bobbin. The machine may operate if the treadle is depressed by mistake, which could result in injury. <Latch type> 2898M 1. Insert the bobbin (1) into the rotary hook (2) so that the winding direction is as shown in the illustration.
  • Page 26 4. PREPARATION BEFORE SEWING <Bobbin case type> <A> 1. Insert the bobbin (1) into the bobbin case (2) so that the winding direction is as shown in the illustration. 2. There are three types of cap (2) (<A>, <B> and <C>). Thread the thread by one of the following methods in accordance with the shape of the bobbin case (2) being used.
  • Page 27: Threading The Upper Thread

    4. PREPARATION BEFORE SEWING 4-5. Threading the upper thread CAUTION Turn off the power switch before threading the upper thread. The machine may operate if the treadle is depressed by mistake, which could result in injury. ・ Turn the machine pulley and raise the thread take-up (1) before threading the upper thread. This will make threading easier and it will prevent the thread from coming out at the sewing start.
  • Page 28 4. PREPARATION BEFORE SEWING <For all models except foundation specifications and T-8452A-405> Do not pass the thread through. <For foundation specifications and T-8452A-405> Center Pass the thread through. (Refer to p.37) If the tension discs are opened as follows, the thread will become easier to thread.
  • Page 29: Adjusting The Stitch Length

    4. PREPARATION BEFORE SEWING 4-6. Adjusting the stitch length 1. Unlock the stitch length dial (2) by turning the dial lock lever (1) to the right until a click is heard. 2. Turn the stitch length dial (2) clockwise or counterclockwise so that the desired stitch length is at the uppermost position on the dial.
  • Page 30: Corner Sewing Method (T-8452A, 8752A)

    4. PREPARATION BEFORE SEWING 4-9. Corner sewing method (T-8452A, 8752A) NOTE: If using this machine in place of a single-needle machine, remove the needle which is not being used. In such cases, do not use the procedures given below to stop the unused needle bar from moving, otherwise damage to the machine may result. 4-9-1.
  • Page 31: Using The Operation Panel (Basic Operations)

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-1. Names and functions • The operation panel keys cannot be operated while sewing is in progress. Select the keys and set the number of stitches before starting sewing. •...
  • Page 32 5. USING THE OPERATION PANEL (BASIC OPERATIONS) Fixed stitch key When this key is pressed so that the indicator illuminates, the number of stitches (1−1999) in the E stitch number display is sewn, and then the sewing machine stops automatically. 2143M Name label key When this key is pressed so that the indicator illuminates, fixed stitch sewing of the number...
  • Page 33: Sewing Start And End Backtack Stitches

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-2. Sewing start and end backtack stitches 2911M Setting start backtack stitches Example: 2157M Setting end backtack stitches Example: 2158M Start backtacking is carried out. After it has finished, normal sewing continues for as long as the treadle remains depressed.
  • Page 34: Sewing Fixed Stitches

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-3. Sewing fixed stitches 2912M 2161M Example: From 1 to 1999 stitches can be set. After the set number of stitches in E (fixed stitches) have been sewn, the sewing machine stops in the needle position that has been set by the needle up/down key (refer to p.26). After this, normal sewing is carried out if the treadle is depressed.
  • Page 35: Using The Lower Thread Counter

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-4. Using the lower thread counter The lower thread counter can be used to let you know approximately how much lower thread is remaining. The value displayed by the lower thread counter display is reduced by 1 from the initial setting value each time the sewing machine sews 10 stitches, and a warning is given when the counter reaches “-5”.
  • Page 36: Using The Operation Panel (Advanced Operations)

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) The operations described in this section should only be carried out by a technician. 6-1. Names and functions These are used for making advanced operating settings. They should only be used by a technician.
  • Page 37: Adjusting The Needle Up Stop Position

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-2. Adjusting the needle up stop position 1. While pressing the needle up/down key (1), turn on the 2210M power switch. 2. “n.0 xx” will appear in the main display (2). (–10 – 20) (“xx”...
  • Page 38: Sewing

    7. SEWING 7. SEWING CAUTION Attach all safety devices before using the sewing machine. If the machine is used without these devices attached, 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. When threading the needle When replacing the bobbin and needle When not using the machine and when leaving the machine unattended...
  • Page 39: Backtacking

    7. SEWING 7-2. Backtacking When the actuator (1) or the reverse lever (2) is pressed 2916M during sewing, the feed direction will be reversed. When it is released, the feed direction will return to normal. 2917M <Actuator rotation function> The actuator can be rotated 90 degrees as shown in the illustration.
  • Page 40: Sewing Condensed Stitches

    7. SEWING 7-3. Sewing condensed stitches If you press the actuator (1) or the reverse lever (2) while sewing is in progress, you can sew stitches (forward direction) with small stitch lengths. Before carrying out sewing, set the stitch length for condensed stitches as follows.
  • Page 41: Thread Tension

    8. THREAD TENSION 8. THREAD TENSION 8-1. Adjusting the thread tension Good even stitches Upper thread Lower thread 0572M Upper thread tension too weak or Increase the upper thread tension. lower thread tension too strong Decrease the lower thread tension. 0573M Upper thread tension too strong Decrease the upper thread tension.
  • Page 42: Adjusting The Presser Foot Pressure

    8. THREAD TENSION 8-2. Adjusting the presser foot pressure Correct stitches Upper thread 0894M Skipped stitches occur 0895M Increase the pressure. Uneven stitch length 0896M Stitches are puckered Decrease the pressure. 0897M The presser foot pressure should be as weak as possible, but strong enough so that the material does not slip.
  • Page 43: Adjusting The Thread Take-Up Amount

    8. THREAD TENSION 8-4. Adjusting the thread take-up amount The thread take-up amount is adjusted by how the thread is <For all models except foundation 2928M passed through the thread amount adjuster (1). specifications and T-8452A-405> <Using standard thread amount adjuster (1)>...
  • Page 44: Cleaning

    9. CLEANING 9. CLEANING CAUTION 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. 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.
  • Page 45: Lubricating Via The Oil Cover (Every 6 Months)

    9. CLEANING <Draining lubricating oil> 1. If the oiler (1) has filled with oil, unscrew the oiler (1) and dispose of the oil inside it. 2. Screw the oiler (1) back into the oil pan. 3002M 9-2. Lubricating via the oil cover (every 6 months) <Minimum lubrication specifications>...
  • Page 46: Applying Grease - When "Greaseup" Appears (Semi Dry Specifications)

    9. CLEANING 9-3. Applying grease --- When “GREASEUP” appears (Semi dry specifications) If “GREASEUP" flashes on the main display (1) and a buzzer sounds when the power switch is turned on, it means that grease needs to be applied. (The sewing machine will not operate at this time, even if the treadle is depressed.) Apply grease while referring to the following page.
  • Page 47: Applying Grease

    9. CLEANING <Applying grease> NOTE: ・ Use only the grease <BZL-301 (SA2694-001) in the blue tube> specified by Brother. Blue ・ Do not use the BZL-300 (SA2355-001) grease in the white tube with this sewing machine. ・ Do not use the BZL-301 (SA2694-001) grease in the blue tube for any models except for those which are indicated with “Use only the grease <BZL-301 (SA2694-001)>...
  • Page 48: Resetting The Cumulative Operating Time

    9. CLEANING 2938M Turn the machine pulley until the screw (1) can be seen. Use the tip of a screwdriver or similar to apply 5-10 mm beads of grease to the slide block slider (2). 4 places at top, bottom, left and right of the slide block (3) * Pour oil into the oil cover at the same time.
  • Page 49: Adjusting The Rotary Hook Lubrication Amount

    10. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT 10. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT CAUTION Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary hook or the feed mechanism when checking the amount of oil supplied to the rotary hook, otherwise injury may result.
  • Page 50: Troubleshooting

    11. TROUBLESHOOTING 11. TROUBLESHOOTING Please check the following points before calling for repairs or service. If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of purchase. DANGER 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.
  • Page 51 11. TROUBLESHOOTING Skipped stitches occur Is the needle tip bent? Is the needle tip blunt? while sewing If the needle tip is bent or broken, replace the needle. Is the needle properly installed? If it is incorrect, install the needle correctly. Is the machine properly threaded? If it is incorrect, thread the thread correctly.
  • Page 52 11. TROUBLESHOOTING Problem Possible cause Page Uneven seam Is the presser foot pressure too weak? Adjust the presser foot pressure. Is the feed dog too low? Adjust the feed dog height. Is the bobbin scratched? If the bobbin is damaged, smooth it with an oiled grindstone or replace it.
  • Page 53 11. TROUBLESHOOTING Problem Possible cause Page Upper and lower threads Is the needle bent or is the needle tip broken? are breaking. Replace the needle if it is bent or broken. Is the needle properly installed? If it is incorrect, install the needle correctly. Is the machine properly threaded? If it is incorrect, thread the thread correctly.
  • Page 54 11. TROUBLESHOOTING Problem Possible cause Page Machine does not operate Is the sewing speed setting or backtack speed setting incorrect? at high speed. Use the sewing speed control keys to set the high speed. Machine stops during Is the fixed stitch key turned on? sewing.
  • Page 55: Error Code Displays

    11. TROUBLESHOOTING 11-2. Error code displays If an error code appears on the operation panel display 1. Make a note of the error code and then turn off the power. 2. After the operation panel display has turned off, eliminate the cause of the error and then turn the power back on.
  • Page 56 11. TROUBLESHOOTING Error code Possible cause Page Is the machine connector inside the control box disconnected? (Safety switch Insert the connector securely. operated) machine head tilted back? Return the machine head to its normal position. 3157M Was the power turned on while the treadle was still depressed? Return the treadle to the neutral position, and then turn on the power switch.
  • Page 57: Instruction Manual

    INSTRUCTION MANUAL http://www.brother.com/ Printed in Japan T-8421A, 8422A, 8452A , 8722A, 8752A SA2698-301 2005.04.B (1)

This manual is also suitable for:

T-8722aT-8752aT-8421aT-8452a