In the process of sewing, computer sewing machine produce bolt, jump line, generally is by the incorrect installation and machine and machine needle bending, threading mistakes, crossed the line cable marks resulting in suture line due to disconnection, jump line, the needle bar height position is unreasonable, time to position the needle and the hook and cooperate with not reasonable, and spindle tip wear and burr, presser foot working condition is bad or because when sewing thin material to produce the problem such as loose cause disconnection, jump line; This is mainly due to the needle

Doesn't tally with hooks movement time or location. , of course, it is possible that the needle can't form coil and cause step line jumper.

A jumper, can look for reasons from the following aspects:

(a) check surface line have wear the wrong or less in one line.

(2) check the needle installation is correct, such as needle long slot installed backwards or skew, etc.

(3) check whether the needle model is applicable, the height of the needle bar adjustment are accurate, and check whether the needle with needle bar at the top. Needle installed too high or too low, will affect the hooks in line. Computer sewing machine manufacturers

(4) check whether the needle is distorted. Use distorted when sewing machine needle, due to the formation of coil away from the hook, hook can't take sutures. Slightly curved needle is very difficult to make out with the naked eye, can put the needle on the platform of the rotation, can identify.

(5) check machine needle and the hook movement of the time. Needle movement time to fully cooperate with hook, hook can accurately check stitching.  

(6) inspection machine needle to sewing thread thickness is appropriate. Large needle with young fine sewing thread can also lead to jump line. This is because the large needle needle is longer, wider, stab fabric holes larger, making fine fine sewing thread has a larger space, if beyond the scope of a hook to cancel, jump line will appear

(7) check machine beard needle eye have because chip bonding the chemical fiber sewing thread and congestion, so that the stitches can't normal delivery, cannot form a coil.

Processing method: upgrade needle installed, according to the correct way to wear good stitching, such as cable mark line part, the line mark polishing, the far end of the needle bar, the distance between the lower end of the needle bar and needle plate plane with staff to adjust the "1" side, needle bar in the middle of the needle plate ministry rises, with staff "2" end into the needle bar and the needle plate, and the rotating hook shaft fixed screw loose to shuttle arrived at needle center fastening, it is important to note that the needle and spindle tip clearance is 0.05 mm, grinding spindle tip of burr, badly worn to replace the new hook, the weight of the different pressure of foot, install presser foot switch with the axis of the screw, such as the presser foot is greater than the buttonhole, use suitable for the size of the buttonhole presser foot, when sewing thin material using a thin fabric knitted woven material special presser foot.