Bending machine equipped with a pantograph

Abstract

The present invention relates to a machine for bending a material having the shape of a wire as a tube having vertical movement of the spar by the use of a pantograph lifting device, advantageously reducing the number of devices used for lifting of said spar and advantageously increasing the lateral stiffness of the machine.

What is claimed is: 
     
         1 . Machine to bend a material having the shape of a wire as a tube comprising a spar, a positioner, a core pull for said tube, the bending head, wherein it comprises a vertical lifting device of the spar having the shape of pantograph. 
     
     
         2 . Machine according to  claim 1 , wherein said device comprises at least two pairs of crossbars placed in a way to form at least two parallel X, connected by a central pin and with the ends connected by a pair of parallel front pins and a rear pair of pins with limited mobility. 
     
     
         3 . Machine according to  claim 2 , wherein the pins have a vertical mobility only and preferably that mobility is reserved for upper shaft only. 
     
     
         4 . Machine according to  claim 3  wherein the rear pair of pins have a horizontal movement and the top rear pin has also a vertical movement. 
     
     
         5 . Machine according to  claim 1 , wherein it comprises a controlled axis of a driving device of vertical lifting of the spar having the shape of pantograph capable of pushing at least one rear pin. 
     
     
         6 . Machine according to  claim 5 , wherein said controlled axis includes an electric motor controlled by a mechanical system of translation, preferably a screw.