Automatic bending machine for manufacturing of steel rule cutting dies

Abstract

A setup method for preventing a “two-leaf cutting” by only operating a machine without using fingers in cutting an end of a strip blade material having an enclosed rectangular geometry. The steps include: the strip blade material being once advanced to a position, where “two-leaf cutting” will not occur; then a cutting tool being lowered; a cutting tool tip of a cutting tool component being lowered to a level of the same as or under that of a top edge of the strip blade material; then the strip blade material being retracted; and finally, the strip blade material being retracted by the same amount as that of the advance from the desired position.

1 . An apparatus for cutting both ends of a strip blade material, comprising a miter cutting unit and a straight cutting unit provided together with an automatic bending machine, wherein
 a cutting tool consists of two higher-profile cutting tool components on both sides, a lower-profile cutting tool component in the middle, and a through pin penetrating through these three;   the three cutting tool components are connected to mini-cylinders through a bar at the top thereof, respectively; the miter cutting unit is vertically moved by an elevating motor;   when the strip blade material is to be cut, the miter cutting unit is lowered by the elevating motor to the position where the strip blade material can be cut, being pinched by the above-mentioned three cutting tool components; then, the mini-cylinders are operated, the positions of the three cutting tool components being changed to cut the strip blade material; and   the three cutting tool components are provided with different die geometries,   
     i.e., a workpiece front end miter cutting edge and a workpiece rear end miter cutting edge. 
   
   
       2 . A setup method for preventing a “two-leaf cutting” by only operating the machine without using fingers in cutting the end of a strip blade material having an enclosed rectangular geometry using the apparatus as defined in  claim 1 , comprising the steps of:
 after the three cutting tool components being positioned such that the two higher-profile cutting tool components are positioned on the side opposite to the rectangular geometry side, the strip blade material being once advanced to a position where “two-leaf cutting” will not occur;   then the cutting tool being lowered;   the cutting tool tip of the cutting tool component being lowered to a level of the same as or under that of the top edge of the strip blade material;   then the strip blade material being retracted; and   finally, the strip blade material being retracted by the same amount as that of the advance from the desired position.