The reasons for the appearance of the toroidal transformer winding machine during use.
1. The quality of the winding machine is not good;
2. The rotary hook has burrs;
3. There are burrs in the tooth holes of the needle plate winding machine;
4. There are burrs in the thread (especially the thread take-up lever);
5. The wire gripper of the winding machine is too tight or has scratches;
6. The tension of the thread take-up spring is too large;
7. The quality of the copper wire is too poor.
