Circular knitting machine for knitted fabrics

Circular knitting machine for knitted fabrics, comprising an assembly of needles which are mounted in rotary needle beds provided with cam sections which act on the needles to conduct them selectively according to alternative trajectories, while the yarns to be knitted are delivered in each section in a selective manner by a programmable feed mechanism, which incorporates a complementary assembly which comprises a lever (40) which can be actuated in connection with a tiltable cam (42), which incorporates another associated lever (44) able to be positioned in order to effect the actuation of a rod (50) which actuates cutting and clamping of the yarn being fed, independently of the introduction of a new yarn substituting for the previous one.