FAQ : OVERLOCK

  • The skipping stitches of the needle thread.

Adjustment:

  1. Loosen the needle thread tension properly.
  2. Adjust the line (A) of the needle thread to the highest position, so that the released value of the needle thread from the thread hook (B) will be decreased.
  • The skipping stitches of the needle thread.WEW

Adjustment:

  1. Select the correct needle and thread number that fits the fabrics.

Adjustment:

  1. Replace with a new needle.

Adjustment:

  1. Adjust the clearance between the left looper tip and the needle to be ±0.

Adjustment:

  1. If the small spring does not function, pull it to be more tightened. NOTE: the thread broken might occur if pulling the spring too tight. If there is any groove existing on the tension adjusting plate, please change a new one.
  • The needle thread is too tight / loose.

Adjustment:

  1. Please adjust the tension of the needle thread.
  • Broken thread and rough / uneven stitches

Adjustment:

  1. Use a piece of the emery cloth to polish the surroundings of the thread hole.

Adjustment:

  1. Replace with a better thread to balance the threads.

Adjustment:

  1. Please be noted that the threads of the left/right looper should not be too loose. When adjusting the position of even one needle thread, related changes of the threads are needed to be noticed. A. Pull the needle thread tightly → the left looper thread is looser → the right looper thread is looser. B. Pull the left looper thread tightly → the right looper thread is looser → the needle thread is looser, too. C. Pull the right looser tighter → the left looper thread is looser → the needle thread is looser.

Adjustment:

  1. Adjust the presser foot flexibility to fit the fabrics.

Adjustment:

  1. Sharpen the trimmer edge or replace with a new one.

Adjustment:

  1. Adjust the differential feeding to match the feeding fabrics.
  • Loud noise or strange noise.

Adjustment:

  1. Adjust the screw to the proper position.
  2. Adjust NK26 of KB06E to stablize the side cover of the fabric plate cover.

Adjustment:

  1. Clean the copper glue from the copper sleeve of the main shaft and readjust it.

Adjustment:

  1. Correct the angle of the side cover of the fabric plate to keep it from the lower looper and the upper trimmer seat.

Adjustment:

  1. Replace a new one or polish the contacting surface to make the clearance smaller.

Adjustment:

  1. Add glue onto the screw.
  2. Grind the groove to make it wider or chamfer.
  3. Replace it with a new one.

Adjustment:

  1. Adjust the angles of the upper and the lower trimmers.
  • The skipping stitches of the needle thread.

Adjustment:

  1. Select the correct needle and thread number that fits the fabrics.

Adjustment:

  1. Replace with a new needle.

Adjustment:

  1. Adjust the clearance between the left looper tip and the needle to be ±0.

Adjustment:

  1. If the small spring does not function, pull it to be more tightened.
Adjustment:
  1. If the small spring does not function, pull it to be more tightened. NOTE: the thread broken might occur if pulling the spring too tight.
  2. If there is any groove existing on the tension adjusting plate, please change a new one.
  • The skipping stitches of the left looper thread.
Adjustment:
  1. Change a new left looper. (When the left looper tip is worn and is to be adjusted/replaced, please do not grind or make the top of the left looper thiner.
  • The trimmer is not sharp.
Adjustment:
  1. Sharpen it or replace it with a new one.
  2. Correct the angles of the upper or lower trimmer seats.
  3. Reassemble it. (Assemble and adjust based on the norm standard)
  • Needle broken.
Adjustment:
  1. Use a thicker needle without having the pinhole on the fabrics.
Adjustment:
  1. When assembling, make sure that the needle can insert into the center of the needle hole of the presser foot.
Adjustment:
  1. Adjust the height of the feed dog teeth to be 0.8mm~1mm over the needle plate, and keep the proper pressure of the presser foot at the same time.
Adjustment:
  1. Adjust the height of the feed dog teeth to be 0.8mm~1mm over the needle plate, and keep the proper pressure of the presser foot at the same time.
  • The needle tip is damaged.

Adjustment:

  1. When the needle is close to the upper dead point, push the needle forward a little to see if the needle tip touches the right looper or not. Then, adjust the height of the needle or the moving position of the right looper.

Adjustment:

  1. The needle guard inside must leave the needle before the left looper tip reaches the right side of the needle. The clearance from the front needle guard to the needle should be about 0.2 mm.

Adjustment:

  1. Move the needle plate forward a little to assemble in order to widen the clearance A a little.
  • The thread does not come out when doing chainstitch.

Adjustment:

  1. Adjust the cam to an appropriate position.

Adjustment:

  1. Adjust the spring strength 
    Polish it or replace with a new one.

Adjustment:

  1. Readjust the spring or change a new one to ensure that the presser foot can move smoothly and test its pressure.
  • The oil does not splash.

Adjustment:

  1. Relock it to the correct position.
    Reassemble the gear of the pump to the main shaft and adjust the position.

Adjustment:

  1. Clean the lints and change the oil releasing screw.
  2. Change a new filter.
  3. Clean the dirts or replace with a new one
  4. Use a piece of iron wire to clean the oil path through.
  • The thin or thick thread is not able to distinguish.

Adjustment:

  1. Clean the stock part, so that the oil can reach the cam.

Adjustment:

  1. Adjust the tension properly, but the tension should not be too loose.

Adjustment:

  1. Correct the width of KP09D or polish the width of KP09D to make it narrower.
  2. Replace KP09D or KP06F.
  • Attachment BK - The lint is too long.
  • a. The backward pulling strength is not enough after the thread is fed..
  • b. BK12E spring is too loose.
  • c. The feed dog is too high to make the thread into the groove of the needle plate.
  • d. The position of BK10 is adjusted improperly.
    • Attachment BK - BK18E does not function well.
    • a. GB13-1 doesn’t bend well.
    • b. BK18E doesn’t bend well.
    • c. The iron plate of the thread tension control set is not adjusted appropriately.
    • Attachment CT / VT / DT - The thread cannot be trimmed.
    • a. The angle of the trimmer is adjusted inappropriately..
    • b. The trimmer is worn.
    • c. The spring plate is fatigued.
    • Attachment CT / VT / DT - The thread cannot be trimmed.
    • a. The angle of the trimmer is adjusted inappropriately..
    • b. The trimmer is worn.
    • c. The spring plate is fatigued.
    • Attachment CT / VT / DT - The air suction is too weak.
  • a. The plastic tube is stocked.
  • b. The TU dirt pocket is full of the lints.
  • c. There are burrs inside the air sucking tube, CT13/DT01/VT01.
  • d. The filter, CSA/CSB, are jammed.
    • Attachment CT / VT / DT - Strange noise
  • a. The assembled trimmer set is not parallel with KR09.
  • b. The trimmer set crashes with the fabric guiding plate.
  • c. DT07/VT16/CT06 is rubbing against the feed dog teeth.
  • d. The parts are worn.
    • Attachment EC - There is no movement.
    • a. EC35 is breakdown.
    • b. The electric board is malfuctioned.
    • c. The pin inside the receptacle is off or does not contact well and fully.
    • d. Incorrect connection of the power cords.
    • e. The fuse is dead.
    • Attachment EC - The trimmer is not able to bounce back.
    • a. The engagement of EC02 and EC05 is not adjusted properly.
    • b. There is a deflection between parts EC13 and EC31.
    • Attachment EC - It is difficult to trim.
    • a. EC02 is loose.
    • b. The engagement of EC02 and EC05 is not adjusted properly.
    • c. EC02 and EC05 are worn.
    • Attachment ES / ESS - The device malfunctions.
    • a. ES39 ruined.
    • b. No chink between ES48 and needle plate.
    • c. PC board is bad
    • d. Loosen magnet ES62 or ES60B.
    • e. Improper position of ES89 and ES60E-1
      (over stitch inspection signal should light on)
    • f. The pins of socket are loose or improper contact.
    • g. The magnet bar of ES77 or ES85 loosened (working signal dosen’t light on).
    • h. ES56 doesn’t move properly.
    • Attachment ES / ESS - The stitches are not even, and skip stitches happened in overlapping.
    • a. Needle plate hole is too large.
    • b. KU60 or ES47 is loosen.
    • c. Improper operation.
    • d. Improper adjustment of differential ratio.
    • e. The teeth of feed dog was worn.
    • f. Presser foot isn’t smooth.
    • g. KU60 and guide plate are too low.
    • h. ES56 extruded too much.
    • i. The clearance between ES48 and trimmer is too far (caution on parallel).
    • j. Improper adjustment on digits of electronic box.
    • Attachment GA - Gathering function does not work well.
    • a. Differential feed ratio is not correct adjusted.
    • b. KV16,KV17 are not adjusted well and pressure is not correct.
    • c. The height of feed dog is not enough.
    • d. The distance between front and back feed dogs is too large or small.
    • e. Clearance exists between KV09 and KV07.
    • f. Clearance exists between KV34 and KV03.
    • g. Feed dog is worn off.
    • Attachment LFA - Power indicative LED doesn't light on.
    1. Change a new fuse
    2. Change the new transformer if it doesn’t work.
    • Attachment LFA - Motor does not function
    1. Test first whether the transformer is damaged. ( as the test method mentioned above)
    2. Check whether the power cable is connected correctly. ( if it is not correct, it would not work or be damaged after a period of use)
    3. Change the new pc board
    4. Change the new signal. (the optical switch)
    • Attachment LFA - The motor does not fuction, the drive motor is burned.
    1. Open the cover and it smells burning when you are close to the motor.
    2. Change another new motor.
    3. Unless using 5 – 10 years, the condenser won’t be damaged easily.
    • Attachment LFA - The motor is running due to the electrification cannot stop.
    1. The pc board is damaged; the transformer cannot return to the origin, which will cause the running of motor.
    2. Change a new transformer or pc board.
    • Attachment LFD - Tape feeding is not smooth.

    Adjustment:

    • Provide proper pressure by adjusting FD120

    Adjustment:

    • Check if the FD118 rubs against FD116

    Adjustment:

    • Adjust SM311 on FD101 or NK44 on AC02.

    Adjustment:

    • Adjust the presser foot width by the width of the elastic tape.

    Adjustment:

    • Adjust it by the front feeding of the control box.

    Adjustment:

    • Adjust it based on the width of the elastic tape.

    Adjustment:

    • Adjust to a proper cleaarance.

    Adjustment:

    • Change a new one

    Adjustment:

    • Change a new one.
    • Attachment LFD - Trimming is not smooth.

    Adjustment:

    • Sharpen it or replace it with a new one.

    Adjustment:

    • Adjust to a proper pressure.

    Adjustment:

    • Adjust to a proper pressure

    Adjustment:

    • Change a new one.

    Adjustment:

    • Adjust to a proper included angle

    Adjustment:

    • Reconnect the tube correctly.
    • Attachment LFD - Air suction trimmer doesn't function well.

    Adjustment:

    • Reconnect the tube correctly or check the control box.

    Adjustment:

    • Adjust to a proper pressure.

    Adjustment:

    • Clean out the obstructions or the burrs.

    Adjustment:

    • Adjust to the proper air pressure.

    Adjustment:

    • Sharpen it or replace it with a new one.

    Adjustment:

    • Adjust the forehand/backhand air suction timing based on how practiced the operators are .

    Adjustment:

    • Change a new one.
    • Attachment LFD - The motion sewing is not smooth.

    Adjustment:

    • Sharpen it or change a new one.

    Adjustment:

    • Adjut the length of the feeding tape to be about 1 mm in front of the neecle.

    Adjustment:

    • Control it to a proper tension by the control box.

    Adjustment:

    • Change a new one.

    Adjustment:

    • Adjust to a proper tension.

    Adjustment:

    • Adjust the differential ration based on the materials of the fabrics.
    • Attachment LFD - The elastic tape is visible.

    Adjustment:

    • Adjust the overcast width based on the correct width first.

    Adjustment:

    • Adjust it by SK209 on P210.

    Adjustment:

    • Adjust it by SM435 on FD127.

    Adjustment:

    • Adjust it to a proper tension.
    • Attachment LFD - The elastic tape cannot be fed into the guidance of the presser foot normally.
    • (1) Check the guidance of the presser foot to confirm whether it matches the elastic tape width or not. The correct width can be done by loosening the screw on the presser foot to adjust the presser foot guide plate.
    • (2) Check whether the height of the presser foot and the horizontal and lengthwise positions of the preser foot are correct. Adjust the screw as shown in the figure to get the correct positions.
    • (3) Make sure the tape feeding step motor is right aimed at the guidance. Loosen the left/right position by adjusting the screw as shown in the figure.
    • (4) The trimmer tip is too narrow, which makes the elastic tape jammed. When adjusting the elastic tape, please loosen the fixed nut, and rotate the main shaft of the air cylinder to adjust the trimmer gauge. However, please be noted that there should be an overlap of 1 mm when the upper and the lower trimers move across to each other. Then, tighten the nut.
    • Attachment LFD - The elastic tape cannot be trimmed.
    • (1) Check whether the air pressure is enough .( 3KG~4KG)
    • (2) Does the upper trimmer overlap the lower trimmer about 1 mm? Adjust the fixed nut. Loosen and rotate the air cylinder main shaft to adjust the knife gauge to be 1 mm.
    • (3) The engagement of the upper and the lower trimmer is not enough. Loosen the screw and then tighten it a little in order to check whether the trimmer can trim the elastic tape or not. Meanwhile, please be noted that the engagement shall not be too tight. Otherwise, the trimmer and the air cylinder main shaft will be worn. Tighten the screw firmly after confirmed.
    • (4) The trimmer is worn and broken down. Replacing the trimmer is needed.
    • Attachment LFD - The step motor cannot function.
    • (1) Check if the power cord connects correctly..
    • (2) The male/female plugs might fall off or doesn’t plug well.
    • (3) Check the fuse inside the electronic box to see whether it is broken or not.
    • Attachment LFD - The sewing thread tension is not equal.
    • (1). Is the roller pressure proper? Is there any clearance of the roller?
    • (2) The tension of the elastic tape is neither equal nor well.
    • (3) The sewing speed is varied. Or, the fabric is pulled incautiously and as a result, the tension would be not even and equal.
    • (4) For adjusting the roller pressure, loosen the screw and tighten it a little until reaching the proper pressure. Then, tighten the scerw firmly.
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