(57) The final correction unit (1) is applied in apparatuses for straightening iron rods
and the like, comprising a plurality of contrarotating straightening rollers (3, 4)
between which the rods (2) to be straightened are inserted, so that they advance along
a longitudinal direction (A). The unit (1) comprises at least one first auxiliary
roller (11) and one second auxiliary roller (12), whose axes are parallel to the axes
of the straightening rollers (3, 4) and are arranged in series on the same plane as
the straightening rollers. An abutment roller (13) is adapted to cooperate with the
auxiliary rollers (11, 12) in order to clamp the rods (2) on a mutual tangency plane
that is substantially longitudinal to the advancement direction (A). The auxiliary
rollers ( 11, 12) can rotate about supporting means (10) that oscillate about an axis
that is perpendicular to the plane of the auxiliary rollers (11, 12). Means (31, 32)
for adjusting the angular position of the supporting means (10) are adapted to tilt
appropriately the plane of tangency formed by the auxiliary rollers (11, 12) with
respect to the advancement direction (A) in order to correct the residual curvature
of the rods (2).
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