Patent ID: 8684060

Claim:
A tyre-changing machine comprising support means ( 4 ) for a wheel, a tool-bearing arm ( 50 ) at an end of which a bead-breaking tool ( 6 ) is hinged according to a hinge axis (E) which is perpendicular to an axis (A) of the wheel, and first motorised means ( 32 , 33 ) for causing a relative movement, in a parallel direction to the axis (A) of the wheel, between the support means ( 4 ) and the tool-bearing arm ( 50 ), such as to press the bead-breaking tool ( 6 ) against a flank of a tyre on the wheel, wherein said machine comprises second motorised means ( 64 ), able to activate independently from the first motorised means ( 32 , 33 ), which second motorised means ( 64 ) are destined to rotate the bead-breaking tool ( 6 ) about the hinge axis (E) with the tool-bearing arm ( 50 ), in order to vary an inclination of the bead-breaking tool ( 6 ) with respect to the axis (A) of the wheel which is mounted on the support means ( 4 ), wherein the second motorised means ( 64 ) are controllable such as to be able to rotate the bead-breaking tool ( 6 ) continuously between two extreme end positions in both directions and to be able to stop the bead-breaking tool ( 6 ) in intermediate positions between the end positions, wherein a tyre-demounting tool ( 7 ) is further mounted on the tool-bearing arm ( 50 ), and wherein the second motorised means ( 64 ) rotate the bead-breaking tool ( 6 ) between two extreme end positions, in at least one of which the bead-breaking tool ( 6 ) is at a minimum radial distance from the axis (A) of the wheel mounted on the support means ( 4 ), which is greater than the minimum radial distance separating the axis (A) of the wheel from the tyre-demounting tool ( 7 ), wherein the bead-breaking tool ( 6 ) and the tyre-demounting tool ( 7 ) are both coupled to a tool-bearing turret ( 5 ) and are oriented in different directions, wherein the tool-bearing turret ( 5 ) is rotatable about an axis (B) perpendicular to the hinge axis (E), to be locked in a first operative position, in which the bead-breaking tool ( 6 ) faces the support means ( 4 ) and the tyre-demounting tool ( 7 ) faces away from the support means ( 4 ), and a second operating position, in which the tyre-demounting tool ( 7 ) faces the support means ( 4 ) and the bead-breaking tool ( 6 ) faces away from the support means ( 4 ), whereby the bead-breaking tool ( 6 ) and the tyre-demounting tool ( 7 ) are selectively activated by rotation of the tool-bearing turret ( 5 ).