Patent ID: 7392681
Filing Date: 2008-07-01
Classification: B21F,Y10S,Y10T

Abstract:
1. A wire rod cutting apparatus of a spring manufacturing machine for manufacturing a spring by discharging a wire rod to a wire rod processing space provided in front of a front wall of a machine casing from a final wire rod guide provided in said front wall, and applying a predetermined process to the wire rod which is discharged to said wire rod processing space or is being discharged to said wire rod processing space, by a tool which protrudes or is protruding to said wire rod processing space, comprising: a slide which is slidably provided in said front wall so as to slide in the direction orthogonal to a center line of a wire rod passage of said final wire rod guide; a cutter mounting oscillating arm which is provided in said slide so as to freely oscillate by a pivot shaft having an axis directed in the longitudinal direction; and an actuating apparatus which slides said slide and oscillates said cutter mounting oscillating arm; wherein said actuating apparatus has: a rotation shaft which is in parallel to said pivot shaft; an eccentric pin which is directly or indirectly provided in said rotation shaft, is eccentric from the center of said rotation shaft and is in parallel to said rotation shaft; a connection rod which is pivotally attached to said eccentric pin in one end; and a connection pin which is provided in said slide in parallel to said eccentric pin and is pivotally attached to the other end of said connection rod; and said wire rod cutting apparatus comprises: a sliding element provided at either one of said connection rod and a portion, opposing to said connection rod, of said cutter mounting oscillating arm; a guide groove, provided on the other of said connection rod and said portion of said cutter mounting oscillating arm, and formed so that said sliding element is fitted therein with no play in the width direction, and one end in the length direction thereof is directed to said eccentric pin and the other end thereof is directed to said pivot shaft; and means for allowing said sliding element to change a position so as to change a distance from said pivot shaft by sliding said sliding element along said guide groove, and for fixing said sliding element at an optional position.