Sounds like possibly more than one problem.
Why is my thread breaking
https://www.sewhere.com/why-is-my-thread-breaking-how-to-avoid-thread-breakage-at-your-sewing-machine
Sewing Machine Problem 1 Thread Breakage
If the top thread is not picking up the bobbin thread, it's possible the machine has been knocked out of time. Did the needle hit something or break recently? You can search for sewing machine timing or take it for service.
Sewing Machine Problem 1 Thread Breakage
generations-quilt-patterns.com
This sewing machine problem is one...
SOURCE: Elna SU missing stiches and breaking thread
it sounds like the needle hook timing is out. You need to get the needle in the lowest position and measure the gap from the needle to the hook point on the bobbin shuttle. It should be 1/4". You will need to remove the foot and foot plate to be able to see. I use a 1/4" drill bit as a gauge. If you need to adjust it, you will need to remove the free arm cover to the right of the foot and loosen the 2 allen head screws that hold the drive gear. Adjust the gap, tighten the screws and retry. Usually if the needle catches the thread to early, it will make a bad stitch and the upper thread will break. If it catches to late, it will make thread loops and the machine will skip stitches. Good luck, these are a good machine and worth fixing. Phil
SOURCE: CONSEW 206RB5 TOP THREAD NOT FORMING STITCHES AND BREAKING
you have your thread tension too tight that's why it is pulling the bottom stitch all the way through it looks good from the bottom but not good on top. Its pulled the stitch all the way through the material.
I had my own upholstery shop 18 yrs and tension gets you every time.Just loosen the top tension.
SOURCE: My lowerlooper thread keeps breaking. I can only
The lowerloop thread kept getting cut by the upperlooper.....I rethreaded the machine in order and then made sure that the lowerlooper thread was UNDER the part of the machine that makes the looks the loopings (silver part that comes to a point on the right side of the needles...sorry I don't know what to call it) and the upperloop was ON TOP of the same part.....it started working great. I actually have very nice tight stitches now.
SOURCE: top thread keeps breaking
This sounds like a backwards needle. Take out the needle and when you re-insert it back in, make sure that put the flat side to the back.
You will have a knob with numbers going from -4 to 4, this is your stitch length dial. The negative numbers are "Reverse" normal stitch length is 2.5. The white knob is stitch width when the needle swings from side to side. Straight stitch would be zero, and then higher numbers for zig zag etc. The little wheel gives you different needle positions. And the metal slide at top of case is the reverse lever.188 views
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