Device for joining plies for tires

A compact, motorized tool for joining uncured elastomeric plies of tires on a rigid support, said tool comprising a first and second plurality of pairs of rollers, said rollers being rigidly interconnected, the rollers of each of said pairs being arranged in a V configuration along an axis of displacement of the tool relative to two plies to be joined, said two pluralities of rollers being adapted to cooperate with opposite surfaces of said two plies to be joined along facing edges disposed on opposite sides of said axis;

• and a separator blade being arranged upstream from said rollers;
• said tool being characterized in that it further comprises a first and a second body supporting said first and second plurality of pairs of rollers respectively, said two bodies being pivotally connected to each other for relative rotation about an axis perpendicular to said axis of displacement;
• adjustment means interposed between said two bodies to adjust their relative angular position about said axis of rotation;
• and driving means to rotate the rollers of one of said pluralities of rollers about their axes, the rollers of the other plurality of rollers being idle, said rollers being substantially cylindrical in shape and being each arranged with its lateral surface facing the lateral surface of at least one corresponding roller of the other plurality of rollers, the rollers of each of said pair of rollers being disposed with their facing ends substantially in contact along a generatrix, and at least each of said driven rollers having lateral serrations adapted to positively engage the respective ply, said pairs of driven rollers and said pairs of idle rollers being subdivided into two groups which are aligned along said axis of displacement, the lateral serrations of the driven rollers of that of said groups which is closest to said separator blade comprising a helical threading, said rollers of each pair of driven rollers and at least one of each pair of idle rollers of the other of said groups being rigidly connected together angularly by coupling means.