Apparatus for sharpening rotating blades

Abstract

A sharpening apparatus for a rotating blade is configured such that a rod-shaped grinding tool or a conical cutting-edge surface is movable in the transverse direction. This carried out by a parallelogram linkage. The grinding tool is pressed by a weight under constant contact pressure against the front cutting surface.

1 . An apparatus for sharpening rotating blades which have a cutting edge running in the circumferential direction and bounded by a rear cutting-edge surface and a front conical cutting-edge surface running in a manner inclined with respect to the rear cutting-edge surface, comprising:
 a blade carrying part, to which a rotating blade can be fastened and by which the rotating blade is rotated;   a grinding head for regrinding the front conical cutting-edge surface, which has a rotating cutting tool,   wherein the relative position between the grinding head with respect to the rotating blade is chosen such that the location of engagement between the rotating cutting tool and rotating blade travels in a direction of an axis of the grinding tool on its lateral surface in dependence on the angular position of the rotating blade.   
     
     
         2 . The apparatus for sharpening rotating blades according to  claim 1 , wherein the relative position of the grinding head and the rotating blade is preset by a linear guide. 
     
     
         3 . The apparatus for sharpening rotating blades according to  claim 1  wherein the diameter of the grinding tool is small compared with its axial dimension. 
     
     
         4 . The apparatus for sharpening rotating blades according to  claim 1 , wherein the grinding head is connected to a prestressing device, in such a manner that the grinding tool is pressed with constant force against the front cutting-edge surface. 
     
     
         5 . The apparatus for sharpening rotating blades according to  claim 4 , wherein the prestressing device comprises a weight or an air cylinder. 
     
     
         6 . The apparatus for sharpening rotating blades according to  claim 5 , wherein the weight is connected to the grinding head via a rope pull. 
     
     
         7 . The apparatus for sharpening rotating blades according to  claim 6 , wherein the rope pull runs over a deflection pulley which cooperates with a driven part of the linear guide. 
     
     
         8 . The apparatus for sharpening rotating blades according to  claim 2 , wherein the linear guide comprises a parallelogram linkage. 
     
     
         9 . The apparatus for sharpening rotating blades according to  claim 7 , wherein at least one of the ends of the adjusting path of the parallelogram linkage is limited by a stop. 
     
     
         10 . The apparatus for sharpening rotating blades according to  claim 1 , wherein a second grinding head is provided, which regrinds the rear cutting-edge surface and is oriented and/or mounted as described in  claim 1  for that grinding head which regrinds the front cutting-edge surface. 
     
     
         11 . The apparatus for sharpening rotating blades according to  claim 1 , wherein the movement of the grinding head, the diameter of the grinding tool, the length of the grinding tool and the geometry of the rotating blade are coordinated with one another such that the grinding tool is supported in every angular position of the rotating blade by the rotating blade. 
     
     
         12 . apparatus for sharpening rotating blades according to  claim 1 , wherein the movement of the grinding head, the diameter of the grinding tool, the length of the grinding tool and the geometry of the rotating blade are coordinated with one another such that in the case of a spiral blade the axis of the grinding tool is oriented such that it is substantially parallel to the main direction of extension of the connecting edge when the latter is in the proximity of the grinding head.