Experience has shown that by making the adjustments and repairs of the machine and adding the appropriate reverse speed, it is possible to achieve the requirement of completely back-stitching on the work.
As for the reverse stitching that is not completely on the work object (ie, the reverse stitching), in order to explain the problem of white, the sewing principle of the single-needle sewing machine should be reviewed. The single needle flat sewing machine needle is oriented to the left of the operator. When working, the machine feeds the suture and retracts the suture through the long slot of the needle, and the loop provided to the hook line is on the right side of the needle. The necessary conditions for forming an ideal wire loop are two at the same time. The first is that the needle is raised from the bottom dead center, and the second is that there is sufficient friction between the sewing thread on the right side of the needle and the sewing material to prevent the sewing thread from being on the machine. When the needle is lifted up, it rises. It is said that the sewing thread depends on the sewing tube bundle, and only the sewing thread can form an ideal loop when the needle bundle and the needle rise from the bottom dead center. At the same time, the suture will only complete its prescribed action in the case of the sewing tube bundle. On the other hand, if the bundle of the sewing material is left, the prescribed action of the sewing thread may be irregular, and there may be a possibility that the thread may be broken. Coupled with the manual operation and the problem of man-machine cooperation, the same machine is doing a good job, and it doesn't work.
The reverse stitching that is not completely on the workpiece sometimes has a good effect by taking a continuous operation. That is, the two live close to each other, relying on the stitching of the two empty joints.
In the daily work, the operator of the single-needle sewing machine should be persuaded to avoid the reverse stitching that is not completely in the working object, because there is no theoretical support for the inverted needle. It is possible for individual operators to have individual machines that are short-lived and accidentally okay but cannot be used as a standard to require all machines to do so.
Through the above discussion, we know that the reverse stitching on the work object can be done by adjusting and repairing the machine, using high-quality needles, sewing threads and appropriately reducing the speed; it is not completely reversed on the work object ( That is to say, the inverted needle air seam) is so good that it is necessary to operate continuously, and it is very possible to separate the individual operation and the disconnection is not good, which is a normal phenomenon.
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