METHOD FOR CONTROLLING ROLLER HOLDER'S TORTIONAL RIGIDITY AND THE ROLLER HOLDER

摘要

PROBLEM TO BE SOLVED: To surely control a roller holder's torsional rigidity by a simple consti tution. SOLUTION: This is a method to control torsional rigidity of a roller holder 2 used in a double-roller style entry guide device 1. By a torsional rigidity adjusting wall 8 attached between a guide rollers 4 and 5 in a roller holder, the most adequate torsional rigidity for steel material's cohesion is provided as long as a roller holder 2's torsion characteristic frequencyωt's ratioΩ:Ω=ωt/ωb is 1.5 or more and 3.8 or less based on a roller holder 2's bending characteristic frequencyωb.