APPARATUS FOR PREVENTING SCRATCH MARK ON THE EDGE SURFACE OF COLD ROLLING COILED STRIP

摘要

The present invention is a tip mark removal device for removing the end mark generated when the steel sheet (S) is wound on the mandrel, the approximately U-shaped frame that can move in the width direction of the steel sheet (S) by the cylinder (20) (10), and the frame (10) rotates the upper and lower swaging rolls 61 (61 ') on the inner and upper surfaces thereof, each having an inclination toward the wake side and the front side of the steel sheet (S) advancing. The first vertical cylinders 31 and 31 ', which are supported and moved forward and backward, and the electrode wheels 63 and 63', which are electrically conductive through the steel plate S, are rotatably supported. And the second vertical cylinders 33 and 33 'for reversing, and the cylinders 34 and 45 for reversing the upper and lower knives 54 and 54' in succession at appropriate intervals. Steel plate clamp plates 56 and 56 ', which are moved forward and backward to the steel plate S, are installed on the downstream side of the steel plate S movement of the steel plate S, and the frame 10 is opened. Laser sensor 82 that can detect the front end of the steel sheet (S) at a position away from the proper distance is mounted so as to process the top surface of the front end of the steel sheet (S) to be inclined a predetermined time, while the front end of the steel sheet is wound around the mandrel Provided is a trailing edge prevention device of the cold rolled steel sheet, characterized in that the leading mark is significantly removed to improve the error rate.