Sewing between the needle and the sewing thread of the sewing machine

The main reasons for disconnection are: line tension is too high, the line fluff and needle overheating:
1, the right to lead by the thread on the lead over the suture;
2, check the line pieces are damaged or sharp edges;
3, suture tension should not be too high,
4, check the needle series is suitable for the type of sewing machine used;
5, the needle must be installed in the hole in the needle bar to the top;
6, the short side of the needle slot or notch must be facing the shuttle hook tip;
7, check the formation of the work of the trip ring,
8. Check the surface smoothness of the bobbin case;
Broken needle
Needle in the sewing by the high arch bending stress and fracture:
1, replaced has been bent or damaged needle, fitted with a new needle;
2, according to the type of sewing machine, select the appropriate needle;
3, adjust the shuttle, feed between the teeth and the needle position relationship, to achieve accurate and coordinated;
4, to ensure that the needle and the pressure pin and needle plate between the appropriate and uniform gap;
5, the encounter line seam at the intersection, slow down the sewing speed;
6, select the needle with the needle to match the suture specifications;
7, to avoid needle-related factors by high temperature;
8, to avoid excessive suture tension;
9, the sewing process to be careful not to make debris hit the needle.
Jump needle
In the process of forming the stitches can not hook the needle thread, can not complete the entire stitch:
1, the machine needle series should be consistent with the type of sewing machine;
2, the needle must be installed in the needle bar in place;
3, the size of the needle should be consistent with the corresponding suture;
4, check the work of the formation of the loop trip;
5, the needle into the needle bar was torsional shift;
6, shuttle tip away from the needle too far;
7, needle plate of the pinhole is too large, the material will be brought into;
8, the use of high-quality sutures;
9, the shuttle hook tip fragmentation;
10, trial suture lubricant.