Circular knitting machine is a types of knitting machines knitting a seamless tube, is widely used in textile industry. The principle of circular knitting machine depends on movement of needles.
When knitting circularly, the needles are cast on and the circle of stitches is joined. Needles are worked in rounds. Originally, circular knitting machine is done using a set of four or five double-pointed needles. Later, circular needles were invented, which can also be used to knit in the round.