Patent ID: 8136463

Claim:
Method for continuous production of three dimensional fabrics ( 50 ) having two external layers ( 51 , 52 ) of fabric having lateral edges where said two external layers of fabric ( 51 , 52 ) are arranged parallel and are connected to each other by means of connection strands ( 53 ) arranged perpendicular to said external layers of fabric ( 51 , 52 ), said method comprising: (a) providing: two bobbins ( 1 , 2 ),each having a layer of fabric ( 51 , 52 ) thereon that will form said two external layers ( 51 , 52 )of the three dimensional fabric ( 50 ), said method further comprising: (b) connecting the two layers of fabric ( 51 , 52 ) by overlapping and joining their lateral edges ( 51 a , 52 a ); and (c) sewing said two layers of fabric ( 51 , 52 ) with a first sewing unit ( 10 ) using connection strands ( 53 ) to connect said layers of fabric ( 51 , 52 ), said sewing with connection strands ( 53 ) being performed with the two layers of fabric ( 51 , 52 ) lying and sliding respectively on two opposite faces of a spacer comb-like structure ( 6 ), which comprise a plurality of bars ( 7 ) arranged in the longitudinal direction and spaced from each other with a pitch corresponding to the space desired between successive longitudinal lines of connection strands ( 53 ), the height of said bars ( 7 ) corresponding to the desired length for the connection strands ( 53 ).