Patent ID: 11951703
Assignee: PIRELLI TYRE S.P.A.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An apparatus for cutting a continuous rubber-covered belt in a process for building a tyre for vehicle wheels, comprising:
a conveyor defining an abutment surface for a continuous rubber-covered belt extended along a supply direction;
a lifting element extended along a direction transverse to the supply direction and vertically movable between a position that is lowered and a position that is lifted with respect to the abutment surface; and
a cutting group, wherein the cutting group comprises:
a knife movable along a cutting direction that is tilted with respect to the supply direction, said knife comprising a first half-part and a second half-part;
movement devices configured for moving the knife between at least the following configurations:
A. wherein the first half-part and the second half-part are side-by-side and mutually joined on a plane of symmetry of the knife orthogonal to the cutting direction, lying in a lifted position with respect to the conveyor and substantially centered with respect to said conveyor;
B. wherein the first half-part is lowered toward the conveyor while the second half-part remains lifted;
C. wherein the first half-part and the second half-part are side-by-side and mutually joined on said symmetry plane, lying in a lowered position toward the conveyor and centered with respect to the center of the conveyor; and
D. wherein the first half-part and the second half-part are spaced from each other along said cutting direction and lie in the lowered position and at opposite edges of the conveyor; and
wherein when the knife is in configuration B and the lifting element is in the lifted position, the rubber-covered belt forms a bump at a cutting zone and the first half-part is lowered in an offset position with respect to a center of the rubber-covered belt and the first half-part cuts the rubber-covered belt on a tilted portion of said bump; wherein the tilted portion is tilted with respect to a horizontal plane.