SunStar KM-957 Series User Manual (English)

Questions and Answers:

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grahamheatherAug 1, 2025
What to do if the upper thread falls out when starting to sew on my SunStar KM-957 Sewing Machine?
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  Mrs. Erica RubioAug 1, 2025
  If the upper thread falls out, ensure the needle is correctly reinserted, or replace it if bent or broken. Check that the thread is inserted correctly and adjust the timing between the needle and hook. If the remaining upper thread is too short, increase its adjustment volume on the control box. Also, adjust the lower thread holder's location and tension if it's not holding the lower thread after trimming. Finally, readjust the needle’s up-stop film position if the thread take-up lever pulls the upper thread out of the needle when starting.
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kathleenandradeAug 6, 2025
How to stop the thread from cutting on my SunStar Sewing Machine?
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  Dennis FowlerAug 6, 2025
  If the thread keeps cutting on your SunStar Sewing Machine, ensure the needle is threaded correctly and replace the needle if it's bent or has a broken tip. Make sure the needle is inserted correctly. Reduce the tension of both the upper and lower threads if they are too tight. You may also need to adjust the take-up lever spring if it's too big.
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Christopher LarsonAug 11, 2025
How to fix poor thread adjustment on my SunStar Sewing Machine?
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  Shawn AtkinsonAug 11, 2025
  To improve poor thread adjustment on your SunStar Sewing Machine, start by adjusting the upper and lower thread tensions. If that doesn't resolve the issue, adjust the thread take-up spring tension. Also, make sure to adjust the gap between the opener and hook.
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zbryantAug 16, 2025
Why does the needle keep breaking on my SunStar KM-957 Sewing Machine?
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  Joseph BrownAug 16, 2025
  If your SunStar Sewing Machine's needle breaks, it might be due to incorrect insertion. Reinsert the needle correctly. Alternatively, the needle might be bent, in which case you should change it. Bad timing of the feed dog or needle and hook can also cause this issue, so you may need to adjust their timing.
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Tara BrewerAug 20, 2025
What to do if my SunStar Sewing Machine has trimming miss?
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  Megan MartinezAug 20, 2025
  If you're experiencing trimming misses on your SunStar Sewing Machine, readjust the movable knife setting position to match the hook. Correct the tension adjustment and surface contact of movable and fixed knives. Ensure the needle is correctly inserted. Replace any scratched or abraded movable or fixed knives. Adjust the timing of the trimming cam and readjust the thread release stroke.
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Christopher WalkerAug 26, 2025
Why is the thread length too short after trimming on my SunStar Sewing Machine?
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  Lawrence SmithAug 26, 2025
  If the thread length is too short after trimming on your SunStar Sewing Machine, adjust the trimming timing. Adjust the thread release stroke if the opening on the thread tension control plate is too small, and reduce tension on the auxiliary thread tension control assembly if it's too strong. Adjust the thread take-up stroke if it is too large and increase the volume adjustment if it is too low.