Drawing apparatus and method for air spinning machines with multiple feeds

Drawing apparatus (4) for air spinning machines with multiple feeds, comprising:

• at least a first and a second introducer element (8,12), independent of each other, so as to be able to feed simultaneously at least two separate slivers (N1, N2) of textile fiber,
• an air spinning device (16) suitable to spin said slivers (N1, N2) of textile fiber,
• a drawing device (24) placed between the introducer elements (8, 12) and the air spinning device (16), comprising a plurality of pairs of drawing rollers (28), comprising one drive roller (32) and one idle roller (36) per pair, said drawing rollers (28) being suitable to perform a progressive drawing of each sliver simultaneously intercepted by them,
• characterized in that
• at least one drive roller (32) of a pair of said drawing rollers (28) is mechanically split into a first drive roller (40) which intercepts a first sliver (Ni) and a second drive roller (44) which intercepts the second sliver (N2),
• said first and second drive rollers (40,44) being operatively connected to separate drive means so that they may be operated at different speeds of rotation, to perform different degrees of drawing of the at least two slivers (N1, N2) intercepted by said first and second drive roller (40,44),
• wherein said first drive roller (40) is associated with a first idle roller (52) and said second drive roller (44) is associated with a second idle roller (56), said idle rollers (52,56) being mechanically separate from each other, and
• wherein said first idle roller (52) is associated with a first thrust means (60) that elastically biases it in contact with the first drive roller (40) and said second idle roller (56) is associated with a second thrust means (64) that elastically biases it in contact with the second drive roller (44).