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With out looking at the machine it is hard to determine the exact problem, but make sure your bobbin thread is placed in the bobbine case corretly, and pulled through the little tension area on the bobbin case.
Next make sure the upper thread is in the tension discs, if not this can also cause you a problem, plus if possible used a little canned air (with the pressure foot up, machine unplugged and thread removed) blow out the tension area.
the tension depends on thikness of material but you must use heavy thread on needle and thin thread on bobin case .
- you must be sew fiew stitches firist and look if losse stitch from down you must tight tension slowly sloly and if there is losse stitches from upper you must tight screw for bobin case spring slowly slowly until stitch format be agood condation.
ashraf abozid [email protected]
This is a tension problem.
In addition to the top thread having a tension adjustment there is the facility to adjust the tension of the bottom(bobbin) thread.
Both these tensions need to be correct to get a balanced stitch and to stop the loose threads underneath the cloth.
It is almost impossible to explain how to adjust the bottom tension you need to be shown.
Somewhere in your manual it should explain how to do this.
I have the same problem, I fix it by removing both Shuttle hook and Bobbin Case and tested it to see if the shuttle hook rotated freely within bobbin case. I noticed the screw for the tension spring was too high and was rubbing agaist bobbin case. Just tighten screw on spring and and recheck for rubbing.