Patent ID: 6804982
Filing Date: 2004-10-19
Classification: B21J

Abstract:
An extracting device (1) for a forging machine for extracting forged details, said forging machine having a base (2), a command device (6) comprising a cam (50) splined or a shaft (51) supported by said base (2), and a forging head (3) supporting an extraction bar (4) for extracting the forged details (1), said extracting bar (4) sliding inside a drilled screw (20) fastened to said base (2) in a position opposite to said forging head (3), having a first axis coincident with a second axis of the forging head (3) and being provided with a double-headed nut (24) and with a thrust collar (27), said extracting device comprising:a first rocker (32) pivotally connected to said base (2) and having a first rocker lever (35) and a second rocker lever (36), said first rocker lever (35) being operatively associated with said double-headed nut (24); a tappet (32) having a first end and an opposite second end, said first end being rotatingly associated with the second rocker lever (36) of said first rocker (30); a second rocker (33) pivotally connected to said base (2), having a first rocker arm (43) with a cylindrical surface (44) facing the tappet (32), and having a second rocker arm (45) in following contact with said cam (50) and the second end of the tappet (32) cooperating with said cylindrical surface (44); a pivoting lever (60) pivotally connected to said base (2) and having a first lever arm (63) and a second lever arm (65), said first lever arm (63) being operatively associated with said drilled screw (20); a connecting rod (62) having a first end rotatingly associated with said second lever arm (65) of said pivoting lever (60), and having a second opposite end rotatingly associated with a middle portion of said tappet (32); and a motor (71), operatively connected to said drilled screw (20) and moving said drilled screw (20) along a longitudinal axis of the drilled screw (20) in rectilinear motion, with said rectilinear motion of the drilled screw (20), through said pivoting lever (60) and said connecting rod (62), causing a change of a contact point of the second end of the tappet (32) along the cylindrical surface (44) of the second rocker (33) and the rotation of the first rocker (30) with a consequent movement of the extraction bar (4), correlating a screw stroke of the drilled screw (20) to an extraction stroke of the extraction bar (4).