How to repair the broken thread of the flat needle of the electric sewing machine

The bottom thread of the electric sewing machine is brokenHow to repair the broken thread of the electric sewing machine

1. The bobbin thread of the electric sewing machine is too full, too loose, and too messy, so that the bottom thread does not flow smoothly during the sewing process, resulting in thread breakage; the winder can be corrected to make the winding on the bobbin uniform, compact, tidy

2. The bobbin of the electric sewing machine is too large or the concentricity of the bobbin is not good, and the operation is inflexible; the appropriate coordination between the bobbin and the bobbin

3. The position of the feeding dog of the electric sewing machine is too low, and the distance between the quick opening at the bottom of the feeding dog and the thread outlet of the bottom thread is too small, so that the bottom thread and the quick opening at the bottom of the tooth have contact friction; adjust the height of the feeding dog reasonably, or remove the feeding For cloth teeth, use fine sand to polish the quick opening at the bottom of the teeth

4. The bottom thread opening of the shuttle skin of the electric sewing machine is fast due to wear and tear; replace the shuttle skin with a new one

5. The edge of the rotary hook skin of the electric sewing machine is hairy, and the bottom thread is broken; the edge of the rotary hook skin is not only polished

6. The hook skin and the hook shell of the electric sewing machine do not cooperate well, there is a gap in the coordination, and the tension of the outlet thread is not uniform; adjust the matching gap between the hook hook and the hook shell reasonably, so that the tension of the bottom thread outlet does not change.