Roller unit for laying cables in a plant for laying cables and plant for laying cables comprising the roller unit

A roller unit for laying cables (11, 12, 13), comprising a frame (23, 23′) where at least one pair of sliders (25, 25′) are positioned disposed in sequence and aligned parallel to a laying direction (S1, S2) of the cables (11, 12, 13), in which said sliders (25, 25′) are each provided with at least one pair of wheels (28, 28a, 28b) to support a cable (11, 12, 13) to be laid and in which said sliders (25, 25′) are hinged to said frame (23, 23′) and rotatable around respective axes of rotation (A, A′) in order to vary the inclination thereof with respect to said frame (23, 23′) and therefore to vary the radius of curvature (R, R1, R2, R3) of the supported cable (11, 12, 13), said roller unit being characterized in that at least one of the sliders (25, 25′) comprises an oscillation limiting tooth (30, 30′) provided in at least one portion (32, 32′) of the slider (25, 25′) protruding from said frame (23, 23′), in which said oscillation limiting tooth (30, 30′) is configured to abut against a lateral wall (31, 31′) of said frame (23, 23′) when said slider (25, 25′), rotating around the respective axis of rotation (A, A′), exceeds a certain inclination, so as to prevent an excessive reduction of the radius of curvature (R, R1, R2, R3) of the cable (11, 12, 13) supported by said slider (25, 25′), wherein said lateral wall (31, 31′) on which the oscillation limiting tooth (30, 30′) abuts is a front or rear wall of said frame (23, 23′) with respect to said laying direction (S1, S2) of the cables (11, 12, 13).