Singer 191K Instructions Manual

To fix bobbin thread breaking on a Singer 191J sewing machine, follow these steps:

1. Check the Bobbin:
- Make sure the bobbin is correctly wound and inserted.
- Use the correct type and size of bobbin recommended for the Singer 191J.

2. Thread the Bobbin Case Properly:
- Ensure the bobbin thread is pulled through the tension spring in the bobbin case.
- The bobbin should turn clockwise when you pull the thread.

3. Clean the Bobbin Area:
- Remove lint, dust, or thread pieces from the bobbin case and surrounding area.
- Use a small brush or vacuum attachment.

4. Adjust Bobbin Tension:
- Check bobbin tension. If it's too tight, loosen the tiny screw on the bobbin case slightly.
- Tension should allow the thread to unwind with slight resistance.

5. Check the Needle:
- Use the correct needle size and type for your fabric.
- Replace bent or dull needles.

6. Re-thread the Upper Thread:
- Improper upper threading can affect bobbin performance.
- Turn off the machine and re-thread from the spool through the tension discs and needle.

7. Check the Thread Quality:
- Use good-quality thread. Old or poor thread can break easily.

8. Inspect for Damage:
- Look for burrs or damage on the needle plate, bobbin case, or hook assembly that might cut the thread.

9. Tension Balance:
- Ensure the upper and bobbin thread tensions are balanced. Uneven tension can cause breakage.

If the problem continues, consider having the machine professionally serviced.

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