A correction device (1) has a support frame (4) and a correction rod (20), which is coupled to the supporting frame and extending along a straight axis (22); the correction rod (20) consists of several segments (21) on the axially fixed positions arranged and aligned, in the angle relative to each other for the linear axis (22) and respective outer surfaces (25), the convexly curved and by means of a matrix of a direct curve (d) and a surface line (g) are defined, which is parallel to the straight axis (22); the distance between the points of the matrix of a direct curve (d) of the straight axis (22) is increased continuously from a minimum distance point (b) to a maximum distance point (c) with the change in the angular position; after adjusting the angular position of the segments (21), its outer surfaces (25) held in the set angular position.
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