Tyre demounting machine

A tire demounting machine comprising:

• a base;
• a supporting unit for supporting wheels on a rest plane, said supporting unit turning around a first longitudinal axis, said supporting unit being supported on said base and equipped with blocking and releasing elements of supported wheels;
• a work-tools supporting column which rises from said base and has a second longitudinal axis substantially parallel to said first longitudinal axis (Z);
• and
• a first support element for supporting at least three work-tools over said rest plane (PA), said first support element being slidingly mounted along said second longitudinal axis on said work-tools supporting column,
• wherein said first support element is orientable by means for orienting around said second longitudinal axis, such to orient each work-tool toward said supporting unit alternatively,
• wherein each of said at least three work-tools is coupled to said first support element by respective removable fastening arrangements which are peripherally placed on said first support element and radially oriented in relation to said second longitudinal axis, and
• wherein said fastening arrangements comprise, for each work-tool:
• a radial and projecting sleeve associated with said first support element and facing outwardly in relation to said second longitudinal axis;
• a coupling stem which protrudes from said work-tool opposite of a working portion of said working tool;
• and
• a removable blocking member of said stem inside said sleeve.