One of the most frustrating situations while sewing is when a tight knot of thread suddenly forms under the bobbin area, the fabric gets completely stuck, and the handwheel refuses to turn. Why does a sewing machine tangle the thread in the bobbin mechanism — and how do you fix it quickly? Here is a step-by-step guide.
Main Causes of Thread Tangles in the Bobbin Area
1. Threading the upper thread with the presser foot lowered
This is the most common mistake. If you thread the upper thread while the presser foot is down, the thread cannot enter between the tension discs. As a result, the upper thread runs completely loose, and the bobbin hook pulls it into loops underneath, instantly forming a tight knot.
2. Forgetting to lower the presser foot or not pulling thread tails back
Before starting a seam, always pull both the upper and lower thread tails about 10 cm to the back under the presser foot. If you leave them directly under the needle, the very first stitch will pull the tails into the bobbin mechanism, causing a jam.
3. Lint and thread scraps accumulated in the bobbin area
Small fibers and fabric bits trapped under the bobbin case disrupt smooth thread movement, causing loops to form incorrectly.
4. Incorrect bobbin winding or installation
Make sure the thread is wound evenly on the bobbin (no gaps or bumps) and not too tightly. Check that the bobbin rotates in the correct direction when unwinding, as specified in your machine's manual.
What to Do If Thread Is Already Tangled in the Bobbin?
Never try to yank the stuck fabric or force the handwheel — you risk bending the needle or damaging the bobbin hook.
- Carefully remove the needle plate.
- Cut the tangled threads around the bobbin case with scissors or a seam ripper, then gently remove the stuck fabric scrap.
- Clean the area, reassemble all parts, re-thread both upper and lower threads following your manual, and do a test stitch on scrap fabric.
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