There are many factors that affect the disconnection. To make the disconnection less, the machine must be parked horizontally and smoothly, and the jitter should be small during operation; the spindle should be lightly rotated; the gap between the parts should be small; the installation position of each component should be accurate (reference The parameters of the points are correct; the passages and holes are smooth; the following are some of the more common causes of disconnection:
Needle
a) The smoothness of the needle is not enough, the polishing of the needle groove and pinhole is not good, and the needle tip is blunt;
b) the needle is bent or not installed in place;
c) The installation angle of the needle is incorrect, the wire groove is not in front, too far to the left or right, or the wire groove is on the back;
d) there are attachments (such as glue) in the pinhole;
e) The needle clamp screw is not in the correct position and should be tilted to the right 40 degrees to the right;
2. Line
a) the quality of the wire is poor, the strength is not strong, too hard, too brittle, too many joints on the tower;
b) The rotation is not correct, apply the left-handed line;
c) the tension of the thread is too large;
d) the line is off the line;
e) the line does not match the pin number;
3. Over the line system
a) through the line hole, over the line wheel, the line hook, the clip line, the upper, middle and lower lines, the take-up rod, the take-up spring and other lines are rough or burr;
b) There are burrs on the needle holder and the presser foot;
c) the needle hole is rough or burr;
4. Hook
a) scratches on the hook, or the gap is too large;
b) the surface of the bobbin case is scratched;
c) bobbin case and hook change;
d) there are scratches on the positioning rod;
e) poor lubrication;
5. Parameters (installation location)
a) Needle bar bottom dead center position (172 degrees);
b) the amount of hook hook line (196 degrees);
c) the height of the needle bar (the center of the pinhole is at the inner plane of the hook at 172 degrees);
d) take-up time (286 degrees);
6. The pattern is too dense or confusing.