Firstly, regular circular knitting machines are not suitable for suitable personnel. The price of regular circular knitting machines is quite high so that few people can afford them. Regular circular knitting machines are only used by enterprises.
Secondly, hand crank machines are also not suitable. Hand crank machines are rather awkward to use. They make decreasing and purling awkward and increasing is impossible on these machines. Needle bed knitting machines are the best circular knitting machines for personnel. With a rib attachment, the machines can make a good tubular knitting. While needle bed knitting machines are large and cumbersome which need lots of room and a separate table to be setup all the time.