What causes the woven bag to break

When sewing products of uneven thickness with a lockstitch woven bag sewing machine encounters a broken thread, in addition to analyzing the above reasons one by one, you should also pay attention to the broken thread caused by two hooks; the sewing machine industry is well known, because The design needs to distribute the action cycle. The transmission ratio of the upper shaft of the lockstitch sewing machine to the rotary hook is 1:2. That is, the upper shaft makes one revolution, and the rotary hook shaft needs to make two revolutions.
Therefore, in the sewing process of the woven bag, the rotary hook rotates for two cycles every time the needle pierces the material, and completes the hooking and expanding loop action of the noodle thread in one week. , The hook thread is hooked twice, it will inevitably conflict with the retracting and unwinding of the upper thread, and the suture will be broken.