| 主权项 |
1. A device for centring the rim (2) of a wheel on the wheel-holder unit (101) of a tyre changer machine (100), comprising a first plate (4) which can be positioned above the wheel-holder unit (101) and coupled there for rotating integrally with it; the first plate (4) comprising a through opening (4a) which can be aligned with a central hole (101a) of the wheel-holder unit (101) for allowing the insertion of a clamping rod (107) in the hole through the opening (4a), for locking the rim (2) on the wheel-holder unit (101), wherein it comprises:
a second plate (5) defining a supporting surface (E) for the rim (2) and comprising its own through opening (5a), the second plate (5) being slidably positioned above the first plate (4) in such a way that it can move relative to it in a sliding plane (F) along a trajectory which has at least one radial component, for aligning and misaligning the through opening (5a) of the second plate (5) relative to the through opening (4a) of the first plate (4); friction reducing means (17) operatively interposed between the first plate (4) and the second plate (5) for facilitating their relative sliding. |
