What's the difference between forward and backward sewing of single needle?

- Dec 25, 2020-

The first markable difference between reverse stitching and forward stitching is that the timing requirements of the needle bar and the eccentricity of the thread feeding are different. During reverse stitching, since the moment of pressing and raising the reverse stitching wrench, it is possible to catch up with the needle punched cloth. If the feed dog is still exposed on the surface of the needle plate at this time, the needle will follow the sewing material. Swing, which is one of the reasons for broken needle and thread in reverse stitching. In order to prevent problem happening, adjust the eccentricity of the lifting thread feed according to the requirements of reverse stitching, so that the sewing material does not move with the moment of pressing and lifting the reverse stitch wrench. the adjustment avoids the problem of instantaneous movement of the needle, but causes another problem: it will go out of the sleeve.

reverse stitching

The second major difference between reverse stitching and forward stitching is that the friction resistance when the hook is running is smaller and smoother, so that the thread take-up lever can use the least force to overcome the friction resistance when the hook is running. Only in this way can the pressure of the crimping device be minimized and not out of the sleeve. Because the friction resistance here is the force of the shuttle frame against the hook positioning hook. The greater the force, the tighter the pressure spring on the pressure plate, and the greater the chance of thread breakage.

The third major difference between reverse stitching and forward stitching is that the friction position between the suture and the needle is different, especially below the needle hole. The friction in the forward and backward directions requires that the needle be smooth in all directions, and no burrs are allowed.

forward stitching

The four major differences between reverse stitching and forward stitching determine the difficulty of reverse stitching. In actual production, in addition to the maintenance personnel adjusting and repairing the machine, under the condition of using high-quality needles and sutures, appropriately reducing the reverse stitching speed is the most cost-effective and effective correct method. Experiments have proved that only by properly adjusting the machine and appropriately reducing the speed of reverse stitching can generally meet the requirements of reverse stitching on the sewing material.

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