Sewing machines are something like cars: There are hundreds of models on the market, and they vary considerably in price and performance. At the low-end of the scale, there are conventional no-frills electric designs, ideal for occasional home use; at the high-end, there are sophisticated electronic machines that hook up to a  a computer. Textile companies have many machines to choose from, including streamlined models specifically designed to sew one particular product.
But just like cars, most sewing machines are built around one basic idea. Where the heart of a car is the internal combustion engine, the heart of a sewing machine is the loop stitching system.
find out what is the special of this stuff.