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In a machine for forming a hollow body, for example a casing of a solid propellant engine, a tensioned and guided belt comprising a layer of adhesive material and a protective strip is fed from a deposit head, supported by a robot and comprising an unwinding device for unwinding the belt, a winding

In a machine for forming a hollow body, for example a casing of a solid propellant engine, a tensioned and guided belt comprising a layer of adhesive material and a protective strip is fed from a deposit head, supported by a robot and comprising an unwinding device for unwinding the belt, a winding device for winding the strip, a first pressing roller for pressing the strip and the layer of adhesive material and rotatable about an axis thereof orthogonal to the feed path of the belt and a second pressing roller for pressing the adhesive material and the strip, rotatable about an axis thereof forming an angle other than 90° to the feed path and movable in opposite directions in a direction transversal to feed path.

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1. A deposit head for a forming machine for forming hollow bodies; the deposit head comprising a support frame adapted to be coupled to a moving member, motorized supply means and guide means carried by said support frame to feed, along a predefined feeding path, a belt comprising a layer of adhesiv

1. A deposit head for a forming machine for forming hollow bodies; the deposit head comprising a support frame adapted to be coupled to a moving member, motorized supply means and guide means carried by said support frame to feed, along a predefined feeding path, a belt comprising a layer of adhesive material and a protective strip arranged on only one side of said layer of adhesive material, motorized winding means for winding said protective strip and carried by said frame, and a first pressing roller for pushing said strip and said layer of adhesive material toward a deposit surface of said adhesive material and rotatable about an axis thereof that is orthogonal to said feeding path, characterized by further comprising a second pressing roller for pushing said strip and said adhesive material toward said deposit surface; said second pressing roller being carried by said support frame and being rotatable about an axis thereof forming, with said feeding path, an angle other than 90°; first actuation and guide means being interposed between said support frame and said second pressing roller for moving the second pressing roller in opposite directions along a direction transversal to said feeding path. 2. A head according to claim 1, characterized in that said transversal direction is a rectilinear direction. 3. A head according to claim 1, characterized in that said second pressing roller is arranged downstream of said first roller in the feeding direction of said belt. 4. A head according to claim 1, characterized in that it comprises a hinge interposed between said second pressing roller and said support frame and having a hinge axis orthogonal to said transversal direction and to the rotation axis of said first roller; motorized means being provided for rotating said second roller in opposite directions about said hinge axis. 5. A head according to claim 4, characterized in that it comprises motorized actuation means for moving said second pressing roller in opposite directions along a further direction parallel to said hinge axis. 6. A head according to claim 5, characterized in that. said actuation means are interposed between said second roller and said first actuation and guide means. 7. A head according to claim 4, characterized in that said hinge is interposed between said support frame and said first actuation and guide means. 8. A head according to claim 4, characterized by comprising a movable structure carrying said second pressing roller, said first actuation and guide means, and said actuation means; said hinge being interposed between said frame and said movable structure. 9. A head according to claim. 1, characterized in that both said first and second pressing rollers, in use, roll in contact with said protective strip. 10. A head according to claim 1, characterized in that it comprises a cutter for transversally cutting only said layer of adhesive material. 11. A head according to claim 10, characterized in that said cutter is arranged upstream of said first and second pressing rollers in the feeding direction of said belt. 12. A head according to claim. 1, characterized in that it comprises means for guiding said belt along said feeding path; said guide means comprising said unwinding means and idle rollers distributed along said path and having radial support surfaces for the longitudinal edges of said belt. 13. A robotized unit for a forming machine for forming a hollow body, in particular a casing of a solid propellant engine; the unit comprising a base which can be fixed to the floor and a robotized articulated arm protruding upward from said base, and a deposit head for depositing an adhesive material coupled to a free end of said articulated arm and implemented as claimed in claim 1. 14. A forming machine for forming a hollow body, the machine comprising a forming drum which rotates about an axis thereof, a head for feeding and depositing an adhesive material on said forming drum, and a mover adapted to move said head with respect to said drum; the deposit head being implemented as claimed in claim 1. 15. A machine according to claim 14, characterized in that both said first and second pressing rollers are arranged, in use, on the opposite side of said strip with respect to said forming drum. 16. A machine according to claim 14, characterized in that said means for moving said head comprise a robotized unit as claimed in claim 13.