Are you sure it is the correct bobbin case ? If it is check the spindle it slides onto and make sure there is not a bit of lint or cotton on there, this will cause it to not engage the locking latch correctly. Also is the bobbin is not the correct one, or is bent it will not lock in correctly. The other thing to do is put a drop of oild on the spindle the bobbin case slides onto.
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It sounds to me as though your excellent Brother is .. defective. If under warranty, replace it. Contact the company. They do Not want an unhappy owner!
Pls chk your bobbin locking at fixing shaft grew or not. on bobbin a sliding locking plate locks at shaft. while keeping in case chk that is loked by pulling. if it dosent lock , change bobbin with spare one.
Check our bobbin for burrs and damage. If the thread catches a rough edge it can pop the bobbin out. Try a different bobbin with new thread... see if that helps. If it does your current bobbin is likely trash.
Hi Kathy it sounds like maybe something is in/under your bobbin case. If you have a manual it should show you how to take the bobbin case out and clean it. Hope this helps
Make sure there is no fluff/lint within the bobbin case causing the bobbin to stand proud. Pressure from the bobbin thread can sometimes stretch the bobbin itself.. replace the bobbin with a brand new one. Double check your threading be removing all thread and starting from scratch.
My bobbin case was jumping all the time...had it in for repairs and would bring it home and even though the tech had attached a test sew piece with different colored bobbin and top thread I could not get it to sew without the bobbin jumping. I thought that he had lied about that being sewn on this machine...finally, I found that you should start with plenty of thread in your hand when threading machine...so that once you feel it click into the tension...DO NOT PULL the thread, it pops it out of the tensioner...just loosely thread and hold tension with your thumb and forefinger while using the needle threader.
The case probably has a scratch or a burr on it. Take it out of the machine and examine it for burrs or scratches.If you find some they can be removed with an emeryboard and then buffed with an SOS pad to make it very smooth. When you put it back in the machine, thread the machine and sew by turning the wheel a few times before you actually begin sewing for real. sewman7
Sounds like a bobbin case related problem. Unplug the machine, then remove the needle plate to get access to the black bobbin case. Inspect the underside of it VERY carefully for ANY marks or roughness. You can expect very fine 'scratches', but no chunks or rough bits.Now check the metal rim that the bobbin case sits on is PERFECTLY smooth. particularly look for any tiny burrs on the top or inside edge of the rim, or any sign of a needle hit. Should not be any! If there are, the mechanic shoul fix it at no extra cost cos he missed the problem. Whilst checking the bobbin case, look for ANY marks on the top surface of it. The SLIGHTEST mark WILL upset the sewing.
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