Process for manufacturing knitwear, hosiery textile items or seamless items with variable compression

A circular weft knitting machine comprising at least:

• a bearing structure (2);
• a cylinder (3) of the needles (4) rotatably mounted in the bearing structure (2);
• a plurality of needles (4) supported by the cylinder (3) and movable parallel to an axis of rotation of the cylinder (3) to produce a knitted fabric;
• a plurality of stitch adjusting cams (7) operatively active upon said needles (4) and selectively movable to vary the width of the stitches (5a) produced by the needles (4) at a respective feeding position (10) of an elastic yarn (9), at least a first feeding device (8) of an elastic yarn (9) operatively active to supply the needles (4) with an elastic yarn (9) at a respective feeding position (10) and on a respective one of said stitch adjusting cams (7);
• a control device (11) of the operation of the knitting machine (1);
• electric and electronic devices (12) connected to the control device (11) and operatively active to control the operation of a plurality of parts of the knitting machine (1) and to detect a plurality of operating parameters of the knitting machine (1);
• the control device (11) being provided with a software configured for executing a process for manufacturing knitwear, hosiery or seamless textile items with variable compression, the process comprising the steps of:
• activating a program for manufacturing a knitwear or hosiery or a seamless textile item (6), on the control device (11) of the knitting machine (1);
• and
• manufacturing a knitwear, hosiery or seamless textile item (6) on the knitting machine, wherein the process further comprises the step of actively and automatically changing, according to a predefined program for manufacturing the textile item, the feeding tension of the elastic yarn (9) fed to the needles (4) at least by the first feeding device (8) according to a predefined value of variation and for a predefined number of times, corresponding to at least two times within the same knitting row during the production of the textile item (6), to define in said same knitting row of the textile item (6) a corresponding predefined number of distinct knitting row portions having a mutually differentiated yarn tension corresponding to at least two portions of the same knitting row.