Patent ID: 8915109
Filing Date: 2014-12-23
Classification: B21C,B21D

Abstract:
1. A manufacturing apparatus of a spiral duct including an elbow, comprising: a wave bending unit that upwardly bends projecting wave portions metal plate members supplied in a state where the metal plate members are cut in such a manner that a straight line and waves are formed, the straight line having a double folded portion, and the respective waves having a single folded portion; a transfer unit that transfers the metal plate members having the bent wave portions; and a forming and cutting unit that forms the metal plate members transferred from the transfer unit into a cylindrical spiral shape, presses the metal plate members to form an elbow, and then cuts the metal plate members, wherein the forming and cutting unit includes: a lower pressing roller that is installed so as to be rotated by power received from a driving motor; an upper pressing roller that is installed above the lower pressing roller so as to press the bent metal plate members; a fixing device that is installed above the upper pressing roller and has a joint jig fixed thereto, the joint jig forming the metal plate members transferred from the transfer unit into a cylindrical shape; a cutter that is composed of upper and lower cutters which are installed on front surfaces of the upper and lower pressing rollers, respectively, so as to cut the metal plate members formed into a cylindrical shape by the joint jig; and a rotating device that rotates the cutter about an axis which is parallel to axes of the upper and lower pressing rollers using a driving force of a servo motor, wherein the joint jig includes: a plurality of divided pieces that are divided in a circular arc shape; a plurality of self-aligning bearings that are coupled to the respective divided pieces such that the divided pieces freely move without interfering with the advancing direction of an elbow formed by the joint jig, wherein the divided pieces of the joint jig have a moving plate which is bent toward one surface and inner curve of the divided pieces so as to guide a metal plate members entering the joint jig in a state where the entered metal plate members are held.