Abstract: The present invention relates to an improved device for tire disassembling machines in general, designed to simplify tire assembling on rim without excessive stretching.

Abstract: The machine comprises a working station (P) and a fixed bed (10) disposed to the rear side of the working station (P). For rotating a wheel (20) there is provided a unit which is carried by a support bracket (30) connected to the fixed bed (10) in such a manner as to be able to swivel about a horizontal axis (A) passing through the working station (P), and comprises, for rigidly locking the wheel rim, a motorized mandrel (32) disposed with its axis (B) perpendicular to and cutting or nearly cutting the swivel axis (A), so that the tire of the wheel (20) carried by the mandrel (32) is traversed, in a virtually central position, by the swivel axis (A) of the support bracket (30). The machine also comprises means (12) for swivelling the support bracket (30) between two operative positions, in the first of which the axis of rotation (B) of the wheel is disposed in a horizontal position, and in the second of which the axis of rotation (B) of the wheel is disposed in a vertical position.