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Sewing Machines Master
Re: The bobbin thread is not catching the upper thread....
There is a possibility that the needle /bobbin timing is out
check this by inspecting the needle eye position in relation to the bobbin hook
the hook should be at the needle just above the eye if the timing is correct
the method for adjustment will be in the work shop manual for the machine , available from the manufacturer on line in pdf version
failing that take it in for a service and adjustment
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That is called "thread nesting," and several things can cause it. The upper thread enters the bobbin area during sewing, catches the bobbin thread, and as the needle goes up, pulls the stitch tight. Something is catching the upper thread as it goes around. The most common reasons are the bobbin or bobbin case (or both) is improperly inserted; the bobbin is warped (roll it down a flat surface--if it wobbles, it's warped), either the case or the bobbin is not seated evenly, there is a rough spot on the bobbin case that is catching the thread, or your bobbin is loosely/badly wound. You need to rule out the possibilities step by step until you find the cause. First, review your threading procedures from start to finish, using your user's manual. Then, without fabric, turn the hand wheel by hand (ALWAYS towards you) to see if you can see it start to catch. The top thread should rotate smoothly in the bobbin area. You should be able to pin-point the cause that way.
Carmen, seem that you have carried out the necessary rectification, but could it be your rotary hook tip blunt/broken, if not most probably it needs needle/hook timing adjustment. And this will require your sewing machine technician to do it.
try changing the needle also try rethreading the machine top and bobbin make sure the bobbin is turned the correct way in the bobbin case if the suggestions don't help then it's possible that the machine needs to be checked for a timing problem
make sure to use every thread guide try a new needle make sure the bobbin is inserted correctly if these suggestions don't help & if the machine is still under warrenty take it back & let them check it
Unplug the machine and remove the needle plate so that the bobbin case if fully exposed. Lift out the bobbin case and the cup that it sets in will be visible. Locate the "hook" on this cup. It is a finger with a sharp point at the upper edge of the cup. The hook is what grabs the thread from the needle while sewing.
Thread the needle.
Turn the handwheel by hand.
Watch the hook as it approaches the needle from right to left.
If the hook passes by the needle AFTER the eye of the needle is above it, you timing has slipped and the machine must be taken in for repair. If the hook catches the thread from the needle, put everything back together and try threading again.
Make sure your needle is in correctly. Check your threading again.
If that does not work, remove throat plate, install new needle, turn hand wheel until needle is at its lowest position and observe if the hook is exactly behind the eye of the needle. If that is correct then you do not have threaded correctly. If it is not then the machine needs to be re-timed.
I've just had this exact problem with my model 2037. The problem, according to 3 shops I've taken mine to, is that the shuttle hook (the metal piece that the bobbin sits in) is broken and needs replaced. Problem is, the piece is next to impossible to find.