A key element of adjusting the woven bag sewing machine is to adjust the so-called hook time, the usual adjustment criteria are: when the needle drops to the lowest position, When lifting 2.2mm upward, the shuttle tip reaches the needle centerline and is 2mm away from the upper edge of the needle hole.
Of course, it is not invariable. Because the real purpose of adjusting the thread hooking time is to make the shuttle tip hook the top thread when forming a full and stable optimal thread ring, to avoid needle skipping. A thin thread is generally used for sewing thin materials, which is soft and has little friction with the sewing material, while the thicker thread is used for sewing thick materials. The sewing thread is rigid and has great friction with the sewing material. Therefore, when the sewing material thickness is different, the time for the suture to form the best thread loop is different, which requires flexible control according to the specific situation when adjusting the hook thread, The ideal sewing effect of the woven bag can be obtained.
Experienced bag sewing machine maintenance workers and operators know that when sewing thin materials, the shuttle tip should be adjusted "faster"; When sewing thick material, the shuttle tip should be adjusted "slowly". The reason is not difficult to understand. When sewing thin material, the suture is thin and soft, the machine needle is lifted slightly from the lower limit position, the surplus suture will swell to both sides of the machine needle to form a threaded ring. Moreover, due to the small friction between the suture and the thread, when the machine needle continues to lift upward, the randomness of the relative position relationship is large. In addition, the suture is thin and soft, the thread ring is easy to deflect, making it difficult to maintain stability. Therefore, A slight advance adjustment of the spindle tip relative to the movement of the needle helps to improve the reliability of the hook line. Therefore, a slight advance adjustment of the spindle tip relative to the movement of the needle can help to improve the reliability of the hook line. On the contrary, when the thick material is slit, the sewing material is thick and firm, the needle can form a plump ring when the lower limit position is raised higher. Moreover, the frictional force between the sewing material and the suture is large, the stitching material is coarse and hard. Even if the needle lift is higher, the sewing thread is more abundant and the wire ring will not deflect. It can still be stable. Therefore, it is more beneficial to prevent needle skipping by adjusting the movement of the shuttle tip later relative to the needle.
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