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US 4,409,872 AGranted
Apparatus for feeding reinforcing layers in tire manufacture
AssigneeSocieta' Pneumatici Pirelli S.p.A.
InventorGiorgio Bertoldo
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AssigneeSocieta' Pneumatici Pirelli S.p.A.
InventorGiorgio Bertoldo
Estimating the term…
An apparatus for feeding elastomeric strips used to form an annular tread reinforcing structure of a vehicle pneumatic tire provided with reinforcing metal cords to a drum which forms the strips into the annular reinforcing structure is disclosed. The apparatus comprises an endless belt looped about spaced pulleys which transfers cut lengths of an elastomeric strip for making an annular tread reinforcing structure from bobbins of the strip to a drum which shapes an annular tread reinforcing member therefrom. The cut lengths of elastomeric strip are maintained in the desired position on the belt and drum by the action of two separate magnetic fields. One of the magnets is stationary and is placed under the belt. The other magnet is adjacent to the belt pulley nearest the drum. Apparatus is provided for laying automatically the two ends of the elastomeric strip on the belt.
An apparatus for automatically feeding transporting strips of elastomeric material having metal cords embedded therein towards a drum which will form an annular reinforcing structure for a tread band of a vehicle pneumatic tire therefrom to be sandwiched between the tire's carcass and the tread band, said apparatus comprising for each of said strips a bobbin having an elastomeric strip wound thereon adapted to form layers of said annular reinforcing structure, a conveyor belt looped around two spaced pulleys one of which is disposed in proximity of said drum in its winding step and cutting means for cutting the elastomeric strip into lengths suitable for layers of said annular reinforcing structure, said apparatus being characterized in that it comprises means for maintaining two distinct and independent magnetic fields adapted to draw and to maintain the strip in pre-established position on the belt surface, said belt being non-magnetic, the first magnetic means being disposed immediately under the belt surface between the two pulleys and being stationary with respect to movement of the belt, and the second magnetic means being disposed on the pulley nearest the drum.
An apparatus for transporting strips of elastomeric material having a magnetic responsive metal reinforcement distributed therein to a drum which is adapted to convert the strips into an annular reinforcing structure for disposing between a vehicle tire's tread band and carcass to support the tread band, said apparatus comprising a conveyor having an endless nonmagnetic belt looped around upstream and downstream pulleys with upper and lower reaches and disposed with the downstream pulley facing said drum for transfer of strips carried on the belt to the drum and the upstream pulley is disposed facing a source of elastomeric strip, means for cutting the strip into lengths adjacent the upstream pulley, means disposed between the upper and lower reaches for maintaining a first magnetic field about the upper reach and spaced laterally upstream from the downstream pulley for maintaining the said lengths on the upper reach for movement with the belt, means disposed adjacent to said downstream pulley for maintaining a magnetic field for attracting the strip towards the said drum from the belt as the strip moves around the downstream pulley, means for moving the conveyor alternately towards the said drum and towards the said source of elastomeric strip, and means for rotating the belt with the upper reach moving towards the downstream pulley.
Dependencies are inferred from the claim text.