Sewing Machine: Working Principle and Classification

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A sewing machine is a machine capable of forming one or more stitches on a sewing material, using one or more sewing threads to interweave or sew together one or more layers of sewing material. This kind of machine is suitable for sewing various fabrics, such as cotton, linen, silk, wool, and artificial fibers, as well as leather, plastic, paper and other products. The stitches sewn are neat, beautiful, flat and firm, the sewing speed is also very fast, and it is very convenient to use. https://fyitester.com/sewing-machine/