What to do if the bobbin turns but the two threads do not connect to form the stitch?

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Accepted Answer

If the bobbin turns but the two threads do not connect to form the stitch, check the following points in order:

Check the direction of the thread unwinding from the bobbin

The thread must unwind in a clockwise direction from the bobbin. If the bobbin turns but the thread unwinds in the opposite direction, the connection with the upper thread will not occur.

Check the installation of the bobbin

Make sure the bobbin is correctly inserted and properly positioned. The cover (f) must be closed after leaving about 10 cm of thread from the bobbin protruding, as indicated in the manual.

Completely re-thread

Proceed to a complete threading of both threads following the exact path:

Upper thread: tap (n) → guide 3 (o) → tension wheel (q) → guide 4 (s) → stretching bar (r) → guides 1 and 2 → eye of the needle
Lower thread: the thread from the bobbin should protrude about 10 cm before closing the cover

Check the tension

Incorrect tension prevents the threads from connecting. Check that the tension wheel (q) is positioned correctly. If the threads do not connect, try a neutral tension setting before adjusting according to your fabric.

Check the needle

The needle must be properly positioned and not bent or damaged. The needle control wheel (m) must be tightly secured and the eye of the needle must be properly threaded.

Check the fabric presser

The presser foot lift lever (t) must be lowered before any stitching. This is a necessary condition for the two threads to connect properly.

If after checking these elements the problem persists, contact JOCCA customer service at atencionalcliente@jocca.es.

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