Method and device for stitching multilayer products of green elastomeric material

A device for stitching an annular multilayer product of green elastomeric material having a concave inner surface negatively matching an outer convex surface, including a stitching mold having a hollow annular body and stitching means housed inside a concave inner surface of said stitching mold for moving to and from an operating position and contacting the concave inner surface of said multilayer product, said stitching means comprising an internal control device and a number of stitching elements extending outwardly from and connected to said control device, said control device including a tubular body extending coaxially through said stitching mold and having a circumferential opening through which said stitching elements are adapted to move between a first idle position, wherein the stitching elements are housed inside said tubular body, and a second operating position wherein said stitching elements extend through said circumferential opening to contact at a given pressure said concave inner surface of said multilayer product;

• and actuating means for producing relative motion of said stitching means and said multilayer product, so as to cause said stitching elements to press said multilayer product into contact with said inner concave surface of said stitching mold and stitch said multilayer product.