What is the cause of looper thread?
Bobbin or Looper Thread Breakage
Tension too tight or bobbin over-running. Adjust bobbin case tension. Insert a washer or a spring to prevent over-running. … Bobbin case not fitting correctly.
How loop is formed in sewing machine?
During sewing the needle descends through the fabric to the bottom of its stroke and as the needle rises a loop of sewing thread is formed in the scarf of the needle. This loop of sewing thread is picked up by one of two stitch forming devices namely the hook or the looper.
Do sewing machines have loopers?
An overlock sewing machine is distinguished from a lockstitch sewing machine by the use of loopers rather than a bobbin. Loopers are used to produce thread loops that extend from the needle thread to the fabric’s edges, enclosing the fabric’s edges within the seam.
Why is my sewing machine looping underneath?
A: Looping on the underside, or back of the fabric, means the top tension is too loose compared to the bobbin tension, so the bobbin thread is pulling too much top thread underneath. By tightening the top tension, the loops will stop, but the added tension may cause breakage, especially with sensitive threads.
Which helps to produce gathers in fabric?
Now, a quick and easy way to make a gather is to use a wide zigzag stitch with a sewing machine. Both the upper and lower thread are pulled long and placed in front of the sewing machine. Then zigzagging is carefully sewed over top of the two threads without catching the threads as it is sewn.
Why is my overlocker not sewing?
When you overlocker is not stitching right, it could be that the blades need changing. … If this threading is wrong, then your overlocker will not form a chain or even a stitch. After that, check your tension settings when you start threading the machine. If they are not already set to 0 do so before threading.