A device for the combined rotation of a shaft about its own axis, of the type which comprises a first body (11, 111, 211) which is elongated diametrically with respect to an axis of rotation (26) of a shaft to be turned, the first body (11, 111, 211) being rigidly coupled to elements for actuating a simple rotation about the axis (26), and a second diametrically elongated body (12, 112, 212), which is arranged transversely to the first body (11, 111, 211) and is coaxial thereto; the second body (12, 112, 212) is associated with the first body (11, 111, 211) and is rigidly coupled to elements for generating torsional vibrations about the axis (26); the second body (12, 112, 212) performs alternating angular movements with oscillations of reduced extent with respect to the first body (11, 111, 211). The second body is adapted to support the shaft to be turned. Elastic compression elements are interposed between the adjacent consecutive portions (11a, 12a, 111a, 112a, 211 a, 212a) of the first and second diametrically elongated bodies (11, 111, 211, 12, 112, 212) and are adapted to cushion small oscillations and facilitate their return. The elastic compression elements are constituted, between each portion (11 a, 111a, 211a) of the first body (11, 111, 211) and the corresponding portions (12a, 112a, 212a) of the second body (12, 112, 212) between which they are arranged, by at least one pair of elastic elements.
