Bending device

Abstract

A bending tool includes movable dies having a bending line of a punch and a workpiece therebetween. A support member supports the movable dies in a manner rotatable into directions opposite to each other in accordance with bending of the workpiece by the punch. A body supports the support member in a manner reciprocatable in a movement direction of the punch in accordance with bending of the workpiece by the punch. The movable dies have respective reception faces for the workpiece, respective bending side end portions, and respective convex circular faces. The support member has respective concave circular faces which slidably fit respectively with the convex circular faces. The bending side end portions engage with each other in accordance with bending of the workpiece by the punch. A sliding portion moves in a pressing direction of the punch relative to the body in accordance with bending of the workpiece.

What is claimed is: 
     
         1 . A bending tool, comprising:
 a pair of movable dies arranged such that a bending line of a punch and a workpiece is interposed therebetween;   a support member for supporting the pair of movable dies in a manner rotatable into directions opposite to each other in accordance with bending of the workpiece by the punch; and   a body for supporting the support member in a manner reciprocatable in a movement direction of the punch in accordance with bending of the workpiece by the punch,   wherein the pair of movable dies have respective reception faces for the workpiece, respective bending side end portions formed on the respective reception faces in such a manner as to face the bending line of the workpiece, and respective convex circular faces formed to face the support member, and   wherein the support member has respective concave circular faces which slidably fit respectively with the convex circular faces, while the bending side end portions of the pair of movable dies are joined to or fit with each other in accordance with bending of the workpiece by the punch, and a sliding portion which moves in a pressing direction of the punch relative to the body in accordance with bending of the workpiece by the punch.   
     
     
         2 . The bending tool according to  claim 1 , wherein the concave circular faces of the support member are formed in a continuous manner. 
     
     
         3 . The bending tool according to  claim 1 , further comprising an elastic member for restoring the pair of movable dies to rotate in directions each opposite to the respective directions of rotation in accordance with bending of the workpiece by the punch, and an urging member for urging the support member in a direction opposite to the pressing direction of the workpiece by the punch. 
     
     
         4 . The bending tool according to  claim 2 , further comprising an elastic member for restoring the pair of movable dies to rotate in directions each opposite to the respective directions of rotation in accordance with bending of the workpiece by the punch, and an urging member for urging the support member in a direction opposite to the pressing direction of the workpiece by the punch.