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Brother S-7220B Instruction Manual
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Brother S-7220B Instruction Manual

Brother S-7220B Instruction Manual

Single needle direct drive needle feed lock stitcher with thread trimmer
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See also: Basic Operation Manual
S-7220B
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
SINGLE NEEDLE DIRECT DRIVE NEEDLE FEED LOCK STITCHER
WITH THREAD TRIMMER
INSTRUCTION MANUAL

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  • Page 1 S-7220B INSTRUCTION MANUAL Please read this manual before using the machine. Please keep this manual within easy reach for quick reference. SINGLE NEEDLE DIRECT DRIVE NEEDLE FEED LOCK STITCHER WITH THREAD TRIMMER...
  • Page 2 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. S-7220B...

  • Page 3: Safety Instructions

    ) 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”.) S-7220B...
  • Page 4 Keep the oil out of the reach of children. with correct operation may also occur. S-7220B...

  • Page 5: Maintenance And Inspection

    Any problems in machine operation which result rotary hook from unauthorized modifications to the machine will If the power switch needs to be left on when not be covered by the warranty. carrying out some adjustment, be extremely careful to observe all safety precautions. S-7220B...
  • Page 6 Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a serious electric shock, Safety devices: and problems with correct operation may also occur. (A) Finger guard (B) Thread take-up cover Direction of operation Oil pan Control box 3722M S-7220B...

  • Page 7: Table Of Contents

    7-2. Sewing start and end backtacking and timing ............55 continuous backtacking and locking thread 13-11. Adjusting the treadle ........56 trimming ............28 13-12. Adjusting the presser foot floating amount (minute lifting amount) ........56 14. TROUBLESHOOTING ....... 14-1. Sewing............57 14-2. Error code displays .........62 S-7220B...

  • Page 8: Names Of Major Parts

    Control box panel Knee lifter assembly Power switch (10) Oil gauge window (11) Reverse lever (12) Stitch length dial (13) Machine pulley (14) Operation panel (Models with operation panel) (15) Cotton stand Safety devices (16) Thread take-up cover (17) Finger guard S-7220B...

  • Page 9: Machine Specifications

    …When sewing at speeds of 3,000 rpm or higher, set the stitch length to 4.5 mm or less. Rotary hook -403, -433 -405 Lubricated / Lubricated / for medium materials for heavy materials Lubricating oil -403, -405 -433 Rotary hook High-speed spindle High-speed spindle Needle bar Special Brother grease S-7220B...

  • Page 10: Installation

    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. 2089M S-7220B...

  • Page 11: Table Processing Diagram

    Control box mounting hole 2090M 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 2091M S-7220B...

  • Page 12: Power Switch

    (1) Head cushions (left) [2 pcs] (2) Head cushions (right) [2 pcs] (3) Oil pan 3632M 5. Rubber cushions (1) Rubber cushions [2 pcs] (2) Nails [4 pcs] 6. Knee lifter complying bar (3) Knee lifter complying bar 2094M S-7220B...

  • Page 13: Machine Head

    (4) Operation panel (5) Washers [2 pcs.] (6) Spring washers [2 pcs.] (7) Screws [2 pcs.] (The washers (5), spring washers (6) and screws (7) are used to secure the side plate) 3725M 9. Sticker (Remove) (1) Sticker 2097M S-7220B...

  • Page 14: Cotton Stand

    (5) is at the desired position within a distance of 16 mm of the needle plate when the knee lifter plate (1) is fully pressed. 3. After adjustment is completed, securely tighten the nut (9). Within 16 mm 3727M S-7220B...

  • Page 15: Lubrication

    If the oil gauge (6) drops below the lower reference line (or if the oil level drops below the lower reference line (7) on the oil tank (3)), be sure to replenish the oil. Upper reference line Lower reference line 3728M S-7220B...

  • Page 16: Connecting The Cords

    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. 3-4-1. Opening the control box cover (1) Screw (2) Cover 3642M 3-4-2. Connecting the cords 1. Sewing machine cords 3729M S-7220B...
  • Page 17 (3) using the repeat cable tie (1), otherwise vibration from the sewing machine may cause the cords become disconnected, which can cause problems with the <Securing> operation of the control box. Cords <Closing the cover> 3645M S-7220B...

  • Page 18: Other Cords

    AC power supply. NOTE: <Single-phase> <Three-phase> extension cords, otherwise machine operation problems may result. Green and yellow wire (ground wire) 2112M 4. Ground wire Ground symbol (1) Ground wire (2) Screw [With washer] (3) Screw Oil pan 2113M S-7220B...

  • Page 19: Test Operation (Operating The Treadle)

    (1) is returned to the neutral position (A). (when needle down stopping has been set.) 4. If the treadle (1) is pressed to position (D), thread trimming is carried out and the needle then rises above the needle plate and stops. 2117M S-7220B...

  • Page 20: Preparation Before Sewing

    * There is an anti-spin spring (3) inside the bobbin case. The anti-spin spring (3) prevents the bobbin from racing at times such as during thread trimming. * Use bobbins (2) made of light alloy as specified by BROTHER. 3734M For thick materials 0798M 2121M S-7220B...

  • Page 21: Winding The Lower Thread

    (2), and then pull it out from the thread guide (3). 4. Check that the bobbin turns clockwise when the thread is pulled. 5. Hold the latch (4) on the bobbin case and insert the bobbin case into the rotary hook. 3736M S-7220B...

  • Page 22: Threading The Upper Thread

    Unlocked dial if the reverse lever (3) is pushed to the halfway- down position. Locked 3. Push the dial lock lever (1) down firmly to lock it. * Check that the stitch length dial (2) does not rotate. 3738M S-7220B...

  • Page 23: Using The Thread Wiper

    If this is done, the thread wiper (2) will operate after the thread is trimmed. 2129M 2209M 3739M 4-8. Using the knee lifter The presser foot (2) can be raised by pressing the knee lifter plate (1). 2131M 3740M S-7220B...

  • Page 24: Using The Operation Panel (Basic Operations)

    When this key is pressed so that the indicator illuminates, the number of backtack stitches (0−99) in the A, B, C and D stitch number displays is sewn continuously. After the sewing machine sews a full cycle of stitches set by A, B, C and D, the thread is trimmed automatically. 2142M S-7220B...
  • Page 25 These keys are used to set the initial value for the lower thread counter. (Refer to p.24.) 2155M (17) RESET key This key is used to return the lower thread counter to its initial value and to cancel warning conditions. (Refer to p.24.) 2156M S-7220B...

  • Page 26: Sewing Start And End Backtack Stitches

    • If the indicator of the thread trimming lock key is illuminated, the sewing machine will stop in the needle up position without thread trimming being carried out. 2160M S-7220B...

  • Page 27: Sewing Continuous Backtack Stitches

    When the AUTO key is pressed to turn on the automatic sewing function, operation will be carried out automatically from continuous backtack sewing through to thread trimming just by depressing the treadle once, without needing to keep it depressed continuously. S-7220B...

  • Page 28: Sewing Fixed Stitches

    • If changing the number of end backtack stitches in C and D, press the fixed stitch key to temporarily turn off the fixed stitch function before making the change. (The CD display will show the number of stitches and the setting can then be changed.) S-7220B...

  • Page 29: Sewing Name Labels

    • If changing the number of start and end backtack stitches in A, B, C and D, press the name label stitch key to turn off the name label function before making the change. (The ABCD display will show the number of stitches and the settings can then be changed.) S-7220B...

  • Page 30: Sewing Pleat Presser Stitches

    • If changing the number of end backtack stitches indicated in C and D, press the pleat presser sewing key to turn off the pleat presser sewing function before making the change. (The CD display will show the number of stitches and the setting can then be changed.) S-7220B...

  • Page 31: Using The Lower Thread Counter

    If you press the RESET key (2), the warning icon (1) will disappear and sewing will be possible when the treadle is depressed. If you press and hold the RESET key (2) for 2 seconds or more, the display will return to the initial value. S-7220B...

  • Page 32: Using The Operation Panel (Advanced Operations)

    • When the needle up icon (23) is illuminated, the needle bar stops in the up position. • When the needle down icon (24) is illuminated, the needle bar stops in the down position. 2207M 2208M 2174M S-7220B...

  • Page 33: Adjusting The Needle Up Stop Position

    If you press the ENTER key, the settings will then be reset. Once the settings have been reset, “iniT ALL” appears in the display and the operation panel settings are reset to their factory default settings. Once the above display appears, normal operation will then be possible. S-7220B...

  • Page 34: Using The Control Box Panel (Basic Operations)

    NOTE: This key (5) and indicator (4) are only enabled during start and end backtacking mode. Stitch number display • This shows the backtacking processes (A, B, C and D) and the number of stitches for each. NOTE: This is only displayed when making the settings. • It also displays error codes. S-7220B...

  • Page 35: Sewing Start And End Backtacking And Continuous Backtacking And Locking Thread Trimming

    1. Press the start backtack key (2) so that “C” is displayed in end backtacking mode) the top row of the stitch number display. 2. Press the end backtack key (3) to set the mode in the bottom row of the stitch number display. 3661M (Continued on next page) S-7220B...
  • Page 36 (Example: 7) 3138M Stitch number setting (D) 1. Press the start backtack key (2) so that “d” is displayed. 2. Press the end backtack key (3) to set the number of stitches for d. (Example: 6) 3139M S-7220B...
  • Page 37 “Thread trimming locked” in the bottom row of the stitch number display 3664M Exiting setting mode Set the power switch (1) to OFF. 3665M Refer to the next page for details on sewing “Start and end backtacking” or “Continuous backtacking”. S-7220B...
  • Page 38 If the treadle is returned to the neutral position while continuous backtacking is being carried out, the sewing machine will stop at the point where the treadle returns to the neutral position.If the treadle is depressed again, operation will resume from the point where it was interrupted. 2159M S-7220B...

  • Page 39: Using The Control Box Panel (Advanced Operations)

    2. Press the end backtack key (2) to set the “ ¯ ” or “ - ” in the bottom row of the stitch number display. Needle stops above the needle plate Needle stops below the needle plate 3146M Set DIP switch -3 to ON. (The settings will be locked.) S-7220B...

  • Page 40: Slow Start

    Then, press and hold the end backtack key (2) for 5 seconds or more. (The display will turn off.) (Display turns off) After this, “Ar” will flash and the initialization will be complete. (5 seconds or more) 3150M Set DIP switch -3 to ON. (The settings will be locked.) S-7220B...

  • Page 41: Setting The Needle Up Stop Position And Needle Down Stop Position

    1. Press the start backtack key (4) so that “ - ” is displayed in the top row of the stitch number display. 2. Press the end backtack key (2) to set the value. (Example: 3) Becomes lower Becomes higher 3152M Set DIP switch -3 to ON. (The settings will be locked.) S-7220B...

  • Page 42: Sewing

    2. Depress the treadle to start sewing. 3743M 9-2. Backtacking When the actuator (1) or the reverse lever (2) is pressed 3744M during sewing, the feed direction will be reversed. When it is released, the feed direction will return to normal. 3745M S-7220B...

  • Page 43: Sewing Condensed Stitches

    (2). (Condensed stitches are sewn while the actuator (1) or reverse lever (2) is being pressed.) * To stop sewing condensed stitches, tighten the bolt (6) so that its head is not touching the solenoid lever (7). 3673M S-7220B...

  • Page 44: Thread Tension

    After the lower thread tension has been adjusted, adjust the upper thread tension so that a good, even stitch is obtained. 1. Lower the presser foot. 2. Adjust by turning the tension nut (2). Becomes weaker Becomes stronger 3748M S-7220B...

  • Page 45: Adjusting The Presser Foot Pressure

    If the tension of the pretension (1) is increased, the lengths of the threads trailing from the needle tips will be reduced; if the tension is reduced, the lengths will be increased. Adjust by turning the pretension (1). Shorter Longer 3676M S-7220B...

  • Page 46: Cleaning

    8. Remove the bobbin from the bobbin case (4) and clean the bobbin case (4) with a cloth. 9. Insert the bobbin into the bobbin case (4), and then place the bobbin case (4) back into the machine. 2184M S-7220B...
  • Page 47 4. Return the machine head to its original position. NOTE: The rubber cap (3) has a hole in it for adjusting the air pressure. Approx. 2 mm When replacing the rubber cap (3) use only the replacement part specified by Brother. 2188M S-7220B...
  • Page 48 3752M 3. Checking 1. Replace the needle if it is bent or if the tip is broken. 2. Check that the upper threads have been threaded correctly. (Refer to page 15.) 3. Carry out a test sewing. 3753M S-7220B...

  • Page 49: Applying Grease [When "Greaseup" Appears

    * If you continue to use the sewing machine after carrying out the reset procedure but without applying grease, problems with the sewing machine may result. <Applying grease> Use Brother-specified grease (SA7300-001). Using the tube 3682M (Continued on next page) S-7220B...
  • Page 50 The buzzer will make a long beep, and then the main display (1) will change to stitch number display mode. 7. Depress the treadle to run the sewing machine for 1 second or more. 8. Turn the power switch to “OFF”. (This completes the reset procedure.) 2139M S-7220B...

  • Page 51: Applying Grease

    * If you continue to use the sewing machine after carrying out the reset procedure but without applying grease, problems with the sewing machine may result. <Applying grease> Use Brother-specified grease (SA7300-001). Using the tube 3682M (Continued on next page) S-7220B...
  • Page 52 5. Then, press and hold the end backtack key (4) for 5 seconds or more. (The display will turn off.) 6. After this, “Gr” will flash and the reset operation will be complete. 7. After the reset operation is complete, set DIP switch -3 to ON. (The settings will be locked.) S-7220B...

  • Page 53: Adjusting The Rotary Hook Lubrication Amount

    “Checking the lubrication amount” above. * Turn the adjusting screw (3) and check the lubrication 3686M amount repeatedly until the lubrication amount is correct. 4. Check the lubrication amount again after the sewing machine has been used for approximately two hours. S-7220B...

  • Page 54: Standard Adjustments

    Adjust so that it is in a position where it is easy to operate. 1. Remove the two screws (2). Back 2. Move the switch setting base (3) to move the actuator (1) to the preferred position <A> or <B>. 3. Tighten the two screws (2). 3757M 3758M S-7220B...

  • Page 55: Adjusting The Safety Switch Position

    If the spring stroke is to small, the safety switch will not operate. 3.5 mm or more Sewing machine Table Clearance is too large. By changing the position of the safety switch, the required spring stroke can be maintained. Reduce the clearance. 3690M 3692M S-7220B...

  • Page 56: Adjusting The Thread Take-Up Spring

    (1). Scale NOTE: If using the tension gauge (7) (sold separately) to measure the tension, take the reading from the scale on the side of the red line. <-4[ ]3> 0.25 - 0.35N <-405> 0.3 - 0.5N 3761M S-7220B...

  • Page 57: Adjusting Arm Thread Guide R

    (1) is at the standard height of 6 mm. 5. Tighten the bolt (6). 6. Replace the oil cap (5). 7. Adjust the presser foot pressure using the adjustment screw (4), and then tighten the nut (3). 3763M S-7220B...

  • Page 58: Adjusting Of The Feed Dog Height

    (6) while carrying out the above adjustment. (Fig. Becomes [B]) lower (Refer to “13-7. Adjusting the feed dog angle” on the next page for details of this operation.) 3765M Becomes higher Needle plate Becomes lower 3766M Becomes higher Becomes higher Becomes lower Becomes lower 3767M S-7220B...

  • Page 59: Adjusting The Feed Dog Angle

    * The height of the feed dog (1) will change after the angle Parallel Needle has been adjusted, so it will be necessary to re-adjust the plate height of the feed dog (1). Lower the front 3769M Back is lowered Raise the front Back is raised Lower the front 3770M S-7220B...

  • Page 60: Adjusting The Needle Bar Height

    B on the <1> side of the accessory timing gauge (2). 6. Securely tighten the screw (7). 7. Install the rubber cap (6). 8. Install the feed dog (5), the needle plate (4) and the presser foot (3). <Presser foot including finger guard> 3772M S-7220B...

  • Page 61: Adjusting The Needle And Feed Mechanism Timing

    3. Loosen the two set screws (5), and then turn the vertical cam (3) sligtly to adjust the timing. NOTE: Use the standard needle and feed mechanism timing. If the timing is changed, broken needles may occur. 4. After adjustment is completed, securely tighten the two screws (5). (Standard) 3774M S-7220B...

  • Page 62: Adjusting The Needle And Rotary Hook Timing

    (10) is enough to allow the thread being used to pass through smoothly. The clearance should be 0.4 - 0.7 mm for -4[]3 models, and 0.6 - 1.1 mm for -405 models. <-4[]3> 0.4 - 0.7 mm <-405> 0.6 - 1.1 mm 3778M S-7220B...

  • Page 63: Adjusting The Treadle

    Turn the adjusting screw (5) clockwise. ・ To lower the presser foot (1) ... Turn the adjusting screw (5) counterclockwise. 5. Tighten the nut (4). * After making the adjustment, sew a piece of material to check the floating amount. Raise Lower 3780M S-7220B...

  • Page 64: Troubleshooting

    Is the thread take-up spring too weak? Adjust the tension of the thread take-up spring. Is the needle and rotary hook timing correct? Adjust the height of the needle bar. Adjust the clearance between the needle and the tip of the rotary hook. 0470M S-7220B...
  • Page 65 Adjust the presser foot pressure. Is the sewing speed too fast? Use the sewing speed control keys to gradually reduce the sewing speed. Is the angle of the feed dog correct? Tilt the front of the feed dog down slightly. 0978M S-7220B...
  • Page 66 Incorrect thread trimming Is the needle properly installed? If it is incorrect, install the needle correctly. (Upper thread or lower thread being Is the fixed knife or movable knife blunt? trimmed) Replace the fixed knife or the movable knife. S-7220B...
  • Page 67 (If the power cord is too long or too many appliances are being run from a single outlet, this may cause voltage drops which will in turn cause the reset function to activate and stop the machine, even if the power supply itself is normal.) S-7220B...
  • Page 68 Insert connector securely. 3154M “GrEASEUP” “GU” This display is to notify you that it is time to apply grease. flashes panel Apply grease. 42, 44* display when the power switch is turned on. S-7220B...

  • Page 69: Error Code Displays

    Is the motor connector disconnected from the control box? (Motor lock) Insert the connector securely. Has the machine locked up? Turn off the power and then turn the machine pulley by hand and check that it turns easily. 2202M S-7220B...
  • Page 70 (Solenoid Check the resistances of the solenoids. overcurrent) Problem with control P.C. board. Replace the control box. Is connector CN5 inside the motor disconnected? Insert the connector securely. (Problem with motor over- heating sensor) 3116M S-7220B...
  • Page 71 If there is a problem, replace the cooling fan. The settings in “Setting method for standard depression stroke” may be incorrect. Redo the settings in “Setting method for standard depression stroke”. (Treadle pedal Problem with treadle unit. position error) Replace the treadle unit. S-7220B...
  • Page 72 Is DIP switch No.4 inside the control box set to ON? (diP SW4) Set DIP switch No.4 to OFF. 3160M If an error code that is not listed above appears or if carrying out the specified remedy does not solve the problem, contact the place of purchase. S-7220B...
  • Page 73 Thread trimming solenoid timeout EEROM error Control box overheating Treadle pedal position error Thermistor error If an error code that is not listed above appears or if carrying out the specified remedy does not solve the problem, contact the place of purchase. S-7220B...

  • Page 74: Instruction Manual

    INSTRUCTION MANUAL http://www.brother.com/ 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177 © 2006 Brother Industries, Ltd. All Rights Reserved. S-7220B SA7437-001 E 2006.06. B (1)

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