Could be the thread sensor is dirty or defective. Be sure to ALWAYS RAISE the presser foot when threading the top thread.
SOURCE: thread constantly wraps around spool pin
Cut a round curcle of fabric the size of the spool from a piece of felt. Put a hole in the middle and put it under the spool of thread. If this does not work you can purchase a small net that fits over the spool. It is designed to keep the thread from coming off the spool except for being pulled through naturally.
Hope this works.
Zelma
SOURCE: Machine not sewing
Make sure you have threaded the machine from right to left, it sounds like the needle thread is trapped under the lower looper thread and cannot form a stitch.........start the threading over from scratch like this:
Is there a diagram for how to thread on the inside of the door ?
Follow that slowly and carefully to make sure you have not missed any thread guides on the way, as each one needs to be followed through to ensure correct tension and thread progression.
If you are certain that all threaded correctly, did you have a fabric jam and pulled it loose ? If so, the timing may well be affected.
Post an update and we'll get this right.
Bargain Box
SOURCE: Designer One "broken thread"
If the upper thread spool is spinning allowing slack to the inlet of the tension assy and the machine gives a broken thread indication shortly afterward, the pre-tension assy needs to be adjusted. If the machine has the original "snap in" tension assy that was in the first generation of Designer 1, have it replaced with the modern "lay in" tension assy. Slack at the spool should never cause a broken thread indication as long at the thread is in the pre-tension assy.
Sulky thread will work as well in a Designer 1 as any other embroidery thread as long as it is properly adjusted.
One thing that you can look for, when the machine is sewing, watch the thread as it passes out of the left hand side of the tension disks. It should exit the disks at the 9 o'clock position. If it starts to drift up to the 10 or 11 position and then you get a broken thread warning, the pre tension must be increased.
SOURCE: Blind hemmer
First get a new quality needle of the right size for your machine use a good quality hemming thread and check your tensions. If this fails to fix the problem you will probably have to have the timing checked.
SOURCE: bobbin thread bunches up creating a tangled mess under the plate
This could either be due to the bobbin being wound too loosely, or the tension on the top thread is too loose. This just happened to me the other day, and I thought it was the bobbin thread, but then I put another bobbin in with a different color than the top thread (this is a huge help in diagnosing thread issues), and I was surprised to find that it was actually the top thread that was a big loopy mess on the underside of the fabric. I fixed it by tightening the tension on the top thread (quite a bit), and everything was fine.
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