Three needle five lines, stretch sewing machine, why would jumper?
1, hook hook hook can not be caused by the needle ring line can be adjusted by threading (face line) and other methods to solve.
Even after the needle can puncture to the hook back of the triangular ring is also no use, the same will occur jumper, curved hook at the bottom of the hook that is bent on the shape of the convex is this point.
3, hanging in the hook on the line of the ring in the needle has not puncture to the hook of the triangular ring has been out of the hook caused by the hook if the hook on the hook on the line too early out of the hook, then
2, the needle can not hook the back of the hook caused by the triangular ring can be adjusted by bending hook threading cam and increase the hook hook line of the pressure to solve.
There are many reasons for the jumper, but mainly with the needle and the needles;
