Bending machine having a bending head that is movable about a stationary bending shank

Abstract

The machine for cambering, shaping, bending or curving a bar along a bending axis includes an arm, a bending shank supported by the arm, a bending head including a bending lug that is rotatable relative to the bending axis, and a feeding station for moving the bar along an axis of travel and across the bending shank. The bending head also includes: a first connecting rod supporting the bending lug and having a head, a second connecting rod having a head, the heads being coupled so as to rotate relative to a hinge axis perpendicular to the axis of travel, a first driver for translating a leg of the first connecting rod along an axis parallel to the axis of travel, and a second driver for translating a leg the second connecting rod along an axis parallel to the axis of travel.

1 . Machine for cambering, shaping, bending or curving a bar along a bending axis, said machine comprising:
 an arm,   a bending shank carried by the arm,   a bending head comprising a rotatable bending lug rotatable relative to the bending axis, and   a feeding station located upstream from the bending shank for moving the bar along an axis of travel and across the bending shank,   
       wherein said bending head comprises:
 a first connecting rod carrying the bending lug, 
 a second connecting rod having a head coupled to a head of the first connecting rod so as to rotate relative to a hinge axis perpendicular to the axis of travel, 
 a first drive means driving in translation a leg of the first connecting rod along an axis parallel to the axis of travel, and a second drive means for driving in translation a leg of the second connecting rod along an axis parallel to the axis of travel. 
 
     
     
         2 . Machine according to  claim 1 , wherein the arm is rotationally mounted along the axis of travel relative to a frame of the machine. 
     
     
         3 . Machine according to  claim 1 , wherein the bending head also comprises a cambering roller rotationally mounted relative to an axis of the roller parallel to the bending axis. 
     
     
         4 . Machine according to  claim 1 , wherein the bending lug is freely rotating about an axis of the bending lug parallel to the bending axis. 
     
     
         5 . Machine according to  claim 1 , wherein the bending head also comprises a tool detachably mounted on the bending head, the tool comprising a supporting part on which the bending lug is mounted, the bending head comprising a means for driving in rotation the supporting part of the tool according to the bending axis. 
     
     
         6 . Machine according to  claim 5 , wherein the bending head also comprises a cambering roller rotationally mounted relative to an axis of the roller parallel to the bending axis, and wherein the cambering roller is mounted on the supporting part of the tool. 
     
     
         7 . Machine according to  claim 5 , wherein the tool comprises a fastening pin extending from a first face of the supporting part of the tool, the bending lug and eventually the roller extending from a second face of the supporting part of the tool, and wherein the bending head comprises:
 a jaw adapted to receive the fastening pin and to immobilize the fastening pin, and   means for driving the jaw and the tool in rotation about an axis of the jaw forming the bending axis.   
     
     
         8 . Machine according to  claim 3 , wherein the axis of the bending lug or the axis of the cambering roller coincides with the bending axis. 
     
     
         9 . Machine according to one of the preceding claims  claim 3 , wherein the external side surface of the bending lug and/or the cambering roller is a surface of revolution about the axis of the bending lug or the axis of the cambering roller. 
     
     
         10 . Machine according to  claim 1 , wherein the outer surface of the bending lug is locally:
 planar, in a plane parallel to the axis of the bending lug or the axis of the cambering roller, or   cylindrical concave, along an axis perpendicular to the axis of the bending lug or the axis of the cambering roller, a diameter of the cylinder corresponding to the diameter of a bar to be bent.