What to do when the sewing machine jump the thread?

- Nov 10, 2017 -

The jumper is a phenomenon of the sewing machine in the process of stitching, because the hook at the bottom of the machine can't hook the surface line or the surface line.This is mainly due to the inconsistency of the movement time or movement position of the needle and hook.Of course, it is also possible that the needle cannot form the coil and lead to the line step.The jump line can be found in the following aspects:

1. Foot problem

Check whether the pressure is too high or too fast.The foot pressure is installed too high, can make the strength of pressing foot pressing the fabric is insufficient, at this time the fabric will be with the pressure of the foot concussion, so that cannot press the plane line to form the coil;Press the foot to send the cloth speed too fast, when conveying the fabric, will take the surface line with the fabric quickly, the hook can not hook the surface line.


2. Machine needle problem

(1) Whether the surface of the inspection surface is worn wrong or underwears a certain crossing position.

(2) Check whether the needle installation is correct, such as the long slot of the machine or the deflection.

(3) Whether the needle model of the inspection machine is applicable, the height of the needle bar adjustment is accurate, and the inspection machine needle is attached to the top of the pin.The machine needle is too high or too low to affect the hook line.

(4) Whether the needle is distorted or not.

When stitching with a distorted needle, the hook can't be stitched because of the coil away from the hook.It is difficult to identify the slightly curved needle with the naked eye and can be distinguished by placing the needle on the platform.

(5) The timing of the needle and hook movement of the inspection machine is consistent.

The motion time of the needle and hook is fully matched, and the hook can be accurately hooked.

(6) The inspection machine needle is suitable for the thickness of the sewing thread.A large needle with a small sewing thread can also cause a jumper.This is because the needle of the large machine needle is longer, wider, the hole of the puncture is larger, so that the fine sewing thread has a larger space movement, if it goes beyond the range of the hook line, it will appear the jump line;

(7) The needle and needle eye of the inspection machine has no cause of the clogging of the chemical fiber sewing thread, so that the suture cannot be delivered normally and the coil cannot be formed.


3. Problem of sewing thread

(1) Check whether the sewing thread is too thick, uneven or too soft.

(2) Whether the tension of the inspection surface is too tight.The line tension is too tight, the needle line formed under the machine is too small, the hook can not be hooked.

4.Other problems

Check the defect of the hook.

(1) The missing hook can't be stitched.

(2) Check whether the hole is too large.Many manufacturers in the production of thin materials, unified exchange of the small machine needle, did not replace the matching needle plate in time.Large needle holes make the fabric to be brought into or out of the round hole, unable to press the sewing thread to form the coil, which can also cause the jumper wire.

(3) Check whether the cloth teeth and the shuttle bed are filled with cotton dust dust and should be kept clean and clean so as not to affect the formation of the line step.

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