Cutting apparatus for welding machine

Abstract

To provide a cutting apparatus for a welding machine, which is less costly, at least one of each of upper blade portion ascending/descending guide units, a lower blade portion ascending/descending guide unit and an ascending/descending guide unit for holding a clearance between the upper and lower blade portions is used in common as a co-use ascending/descending unit out of the plurality of ascending/descending guide units. Also, there is provided a hydraulic drive unit normally depending upon the operation of the upper blade portion ascending/descending link unit and working as a drive source for the upper blade portion ascending/descending link unit when necessary, in conjunction with the upper blade portion or the upper blade portion ascending/descending link unit.

What is claimed is:  
     
         1 . A cutting apparatus for a welding machine comprising a pair of upper and lower blade portions facing to each other, an upper blade portion ascending/descending link means for moving the upper blade portion up and down to the lower blade portion, a plurality of ascending/descending guide means for guiding abutment between the upper and lower blade portions, and an ascending/descending drive means for ascending/descending the upper blade portion through said upper blade portion ascending/descending link means, 
 wherein at least one of each of the upper blade portion ascending/descending guide means, the lower blade portion ascending/descending guide means and the ascending/descending guide means for holding a clearance between the upper and lower blade portions is used in common as a co-use ascending/descending means out of said plurality of ascending/descending guide means.    
     
     
         2 . The cutting apparatus for a welding machine, according to    claim 1   , wherein said co-use ascending/descending guide means engages end portions of the upper and lower blade portions movably up and down with a guide shaft provided in an apparatus frame so as to extend in parallel with an abutment direction of the upper and lower blade portions.  
     
     
         3 . A cutting apparatus for a welding machine, comprising a pair of upper and lower blade portions facing to each other, an upper blade portion ascending/descending link means for moving the upper blade portion up and down to the lower blade portion, a plurality of ascending/descending guide means for guiding the abutment between the upper and lower blade portions, and an ascending/descending drive means for ascending/descending the upper blade portion through said upper blade portion ascending/descending link means, 
 further comprising a hydraulic drive means normally depending upon the operation of said upper blade portion ascending/descending link means and working as a drive source for said upper blade portion ascending/descending link means when necessary, in conjunction with said upper blade portion ascending/descending link means.    
     
     
         4 . The cutting apparatus for a welding machine, according to    claim 1   , further comprising a hydraulic drive means normally depending upon the operation of said upper blade portion ascending/descending link means and working as a drive source for said upper blade portion ascending/descending link means when necessary, in conjunction with said upper blade portion ascending/descending link means.  
     
     
         5 . The cutting apparatus for a welding machine, according to    claim 1   , further comprising a hydraulic drive means normally depending upon the operation of said upper blade portion ascending/descending link means and working as a drive source for said upper blade portion ascending/descending link means when necessary, in conjunction with said upper blade portion.  
     
     
         6 . The cutting apparatus for a welding machine, according to    claim 5   , wherein at least one ascending/descending guide means other than the co-use ascending/descending guide means is provided with a guide hydraulic drive means, and a piston rod of a hydraulic cylinder as said guide hydraulic drive means is used as a guide shaft.  
     
     
         7 . The cutting apparatus for a welding machine, according to    claim 4   , wherein the hydraulic drive means is a hydraulic swing motor, and an output shaft of said swing motor is coupled detachably to the upper blade portion ascending/descending link means.  
     
     
         8 . The cutting apparatus for a welding machine, according to    claim 7   , wherein the hydraulic swing motor is provided with a solenoid valve for opening/closing a hydraulic circuit of the swing motor so as to operate or stop the swing motor.