Patent ID: 9248486
Filing Date: 2016-02-02
CPC Classification: B21B,B21D

Claim Text:
1. A roller leveler in which a steel plate is flattened while being carried, comprising: a plurality of leveling rolls which are arranged with a predetermined pitch in a carrying direction of the steel plate; a retract mechanism configured to make part of the leveling rolls retract from a pass line where the steel plate is passed, for changing a roll pitch of the leveling rolls which are used for flattening the steel plate; a plurality of backup rolls configured to restrain deflections of the leveling rolls; and a plurality of shaft support parts, each of which supports both end sides of a fixed shaft rotatably holding a corresponding one of the backup rolls or supports both end sides of a rotation shaft rotating together with a corresponding one of the backup rolls, wherein the retract mechanism is provided with a fixed side recessed-and-protruded member having a plurality of fixing side protruded parts arranged with a first pitch in an axial direction of the leveling roll, a movable side recessed-and-protruded member having a plurality of movable side protruded parts arranged with the first pitch in the axial direction of the leveling roll, and a moving mechanism configured to move the movable side recessed-and-protruded member in the axial direction of the leveling roll, wherein tip ends of the fixed side protruded parts are formed in a fixed side abutting face having a flat-shaped face which is substantially perpendicular to an upper and lower direction, and tip ends of the movable side protruded parts are formed in a movable side abutting face having a flat-shaped face which is substantially perpendicular to the upper and lower direction, wherein the shaft support parts are disposed so as to overlap with the fixed side protruded parts in the upper and lower direction when viewed in the carrying direction of the steel plate, and wherein when the part of the leveling rolls are located on the pass line side, the fixed side abutting faces and the movable side abutting faces are abutted with each other and, when the part of the leveling rolls are retracted from the pass line, the movable side recessed-and-protruded member is moved in the axial direction of the leveling roll so that the movable side protruded parts are disposed between the fixed side protruded parts and the fixed side protruded parts are disposed between the movable side protruded parts.