Machine for mounting and demounting a tyre relative to a corresponding vehicle wheel rim and method for mounting a tyre

A method for mounting a tyre of a vehicle wheel relative to a corresponding rim of the wheel, comprising the following steps:

• preparing a machine for mounting the tyre relative to the rim and including:
• a frame provided with a column extending along a vertical direction,
• a wheel-holder unit, movable in rotation about a vertical axis of rotation and in translation towards and away from the column along a horizontal axis of translation,
• a mounting tool, configured to operatively engage the tyre,
• a main arm, extending above the wheel-holder unit between a first end that is connected to the column, and a second end,
• a working unit, including a first arm pivoted to the second end of the main arm at a hinge point to rotate about the hinge point and extending along an extension axis, and a first sidewall pressing tool which is configured to come into abutment against a sidewall of the tyre of the wheel mounted on the wheel-holder unit and which is connected to the first arm,
• locking the rim to the wheel-holder unit;
• moving the wheel-holder unit in translation along the horizontal axis of translation;
• moving the working unit along the vertical direction from a rest configuration, where the working unit is raised and distal from the wheel, to a working configuration, where the working unit is moved close to the wheel to bring the first sidewall pressing tool into abutment against the sidewall of the tyre;
• placing a mounting tool between an annular edge of the rim and a bead of the tyre;
• rotating the wheel-holder unit,
• moving the main arm in translation along a movement axis, parallel to the horizontal axis of translation and spaced therefrom, towards or away from the column so that the hinge point remains aligned with the vertical axis of rotation of the wheel-holder unit so that, following the translational movement of the wheel-holder unit, the vertical axis is maintained vertically aligned with the hinge point during the translational movement of the wheel-holder unit, and
• wherein, during the translational movement of the wheel-holder unit, the first arm moves so as to maintain the extension axis along a first plane which intersects a second plane formed by the horizontal axis of translation and the vertical axis of rotation of the wheel-holder unit.

A machine for mounting and demounting a tyre relative to a corresponding rim of a vehicle wheel, comprising:

• a frame provided with a column extending along a vertical direction;
• a wheel-holder unit, movable in rotation about a vertical axis of rotation and in translation towards and away from the column along a horizontal axis of translation;
• a main arm, extending above the wheel-holder unit between a first end that is operatively connected to the column, and a second end;
• a working unit, connected to the main arm and including:
• a first arm pivoted at a hinge point to the second end of the main arm to rotate about the hinge point, where the hinge point lies in a plane that includes the vertical axis of rotation and the horizontal axis of translation, the first arm extending along an extension axis, and
• a first sidewall pressing tool, connected to the first arm and configured to come into abutment against a sidewall of the tyre of the wheel mounted on the wheel-holder unit,
• the working unit being movable along the vertical direction between a working configuration, where the working unit is close to the wheel-holder unit and a rest configuration, where the working unit is raised and distal from the wheel-holder unit,
• wherein the main arm is movable by translation along a movement axis parallel to, and spaced from, the horizontal axis of translation towards and away from the column to keep the hinge point vertically aligned with the vertical axis of rotation of the wheel-holder unit, wherein the main arm is further movable vertically to move the working unit between the working configuration and the rest configuration, so that, following a translational movement of the wheel-holder unit, the main arm is made to move in translation parallel to the horizontal axis of translation of the wheel-holder unit, so to maintain the vertical axis of rotation of the wheel-holder unit vertically aligned with the hinge point during the translational movement of the wheel-holder unit, and
• wherein, during the translational movement of the wheel-holder unit, the first arm moves so as to maintain the extension axis along a first plane which intersects a second plane formed by the horizontal axis of translation and the vertical axis of rotation of the wheel-holder unit.