| US 7,452,318 B2 | ||
| Machine and method for forming helically wound paper tubes having improved mechanical resistance | ||
| Mauro Gelli, Lucca (Italy); and Mario Gioni Chiocchetti, Lucca (Italy) | ||
| Assigned to Fabio Perini S.p.A., Lucca (Italy) | ||
| Appl. No. 10/554,406 PCT Filed May 07, 2004, PCT No. PCT/IT2004/000253 § 371(c)(1), (2), (4) Date Oct. 24, 2005, PCT Pub. No. WO2004/101265, PCT Pub. Date Nov. 25, 2004. |
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| Claims priority of application No. FI2003-A0133 (IT), filed on May 15, 2003. | ||
| Prior Publication US 2007/0010387 A1, Jan. 11, 2007 | ||
| Int. Cl. B31C 1/00 (2006.01) | ||
| U.S. Cl. 493—269 [493/276; 493/290; 493/299; 493/301; 493/304; 156/195; 156/431] | 17 Claims |
| 1. A machine for producing a tubular product by helical winding and gluing of strips of web material, comprising a mandrel,
a winding member constructed and arranged to helically wind in an overlapping and staggered manner at least two strips of
web material around said mandrel to form a tubular product, at least one pressure member cooperating with said mandrel and,
in combination with said winding member, disposed along a path of the tubular product being formed on said mandrel, wherein
pressure exerted by said pressure member promotes adhesion of the strips forming the tubular product,
wherein said at least one pressure member comprises at least one wheel and an actuator to stress the at least one wheel and
the mandrel against each other,
wherein said at least one wheel is carried by a support arranged to slide in a sleeve and torsionally constrained to said
sleeve,
wherein said sleeve is arranged to be locked in an angularly adjustable position with respect to a fixed load-bearing structure,
wherein said sleeve comprises a flange with slotted holes to lock said sleeve in said angularly adjustable position.
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