Patent ID: 7543470
Filing Date: 2009-06-09
Classification: B21D

Abstract:
1. A roll straightener comprising a plurality of rolls including an odd number of at least five upper rolls arranged to form an upper row, and an odd number of at least five lower rolls arranged to form a lower row, said upper rolls and said lower rolls being arranged to allow a workpiece passed between said upper row of upper rolls and said lower row of lower rolls to be straightened, wherein: a first group of said rolls is moveable in both a vertical and in a transverse direction of said rolls, said first group of rolls being located on said upper row or said lower row, and including at least an innermost roll located at a middle position of said upper row or said lower row, and a roll adjacent to said innermost roll and closest to a workpiece insertion side of said roll straightener; a second group of said rolls, which is exclusive of each of said first group of rolls, an inlet-side upper roll, an inlet-side lower roll, an outlet-side upper roll, and an outlet-side lower roll, is movable only in the vertical direction, so as to allow said roll straightener to be adjusted between an opposed arrangement, in which said upper rolls and said lower rolls are vertically aligned with and oppose each other, and a zig-zag arrangement, in which at least one of said upper rolls is offset from one of said lower rolls.