... broken , thread broken, electronic problem4 Automatic oil pump system5 Can make “Y” form heel part6 change 6 color yarn system7 Use ... / 3 phase , 50/60HZAdvantage:SM-0612,drumless , double cylinder, fully computerized sock knitting machine , can knit various socks for men ,women ,children ... high speed . Also it can make 4 color socks by the some shuttles. The machine have so simple structure that it ...