Drawing and spinning apparatus and method of mixed yarns for air spinning machines with multiple feeds

A drawing and spinning apparatus of mixed yarns for air spinning machines with multiple feeds, comprising:

• at least a first and a second introducer element, independent of each other, so as to be able to feed simultaneously at least two separate webs of textile fibre;
• an air spinning device suitable to spin said webs of textile fibre;
• an air spinning device chamber for interweaving said webs of textile fibres, wherein the air spinning device chamber comprises an introducer nozzle adjacent therewith, the introducer nozzle being structured to receive the webs from a drawing device, wherein the introducer nozzle is placed between the drawing device and the air spinning device, wherein the introducer nozzle comprises two insertion channels structured to introduce the webs inside the spinning chamber in a longitudinal feed direction, wherein the introducer nozzle is further structured to maintain separation of the webs until the webs are introduced inside the spinning chamber;
• wherein said spinning chamber comprises a plurality of jets of air oriented in a direction substantially tangential to the webs in input to the spinning chamber, so as to interweave said webs and obtain a single yarn in output from the spinning chamber;
• and
• wherein, with respect to a cross-section plane perpendicular to said longitudinal feed direction, groove bottoms of each of said two insertion channels are offset by an eccentricity with respect to a geometric centre of the spinning chamber, through which a symmetry axis of the spinning chamber passes, said eccentricity being less than 5% of a maximum diameter of the spinning chamber.