Blade sharpener for household use

Abstract

A blade sharpener for grinding a kitchen knife, etc. in which two separate rotary shafts are provided in parallel, at least one whetstone is mounted on each one of the rotary shafts, the circumferential surface of the whetstone forms a grinding surface, the whetstone on one rotary shaft and the whetstone on the other rotary shaft are positionally shifted in the axial direction of the rotary shafts, and the cutting edge of the blade of kitchen knife is ground by moving the blade in the axial direction of the rotary shafts while applying the cutting edge to the grinding surfaces of the whetstones.

1 . An electric blade sharpener in which a whetstone is provided on a rotary shaft and is rotated by a motive force of a motor and a cutting tool is sharpened when moved in an axial direction of the rotary shafts while applying a cutting edge of the cutting tool to a grinding surface of the whetstone, wherein: 
 two separate rotary shafts are provided; and    at least one whetstone is mounted on each of said two rotary shafts, a circumferential surface of said whetstone forming a grinding surface, and a whetstone on one of said two rotary shafts and a whetstone on another one of said two rotary shafts being positionally shifted in an axial direction of said rotary shafts.    
     
     
         2 . The electric blade sharpener according to  claim 1 , wherein said whetstone on one of said two rotary shafts and said whetstone on another one said two rotary shafts partially overlap between said two rotary shafts.  
     
     
         3 . The electric blade sharpener according to  claim 1 , wherein said whetstone is in a cylindrical shape, and the grinding surface is at right angles with respect to a planar portion of said whetstone.  
     
     
         4 . The electric blade sharpener according to  claim 1 , wherein said whetstone on at least one of said two rotary shafts is in a truncated cone shape and is provided so that a smaller diameter portion of said truncated cone shape whetstone faces in a direction in which said cutting tool is moved in the axial direction of said rotary shafts.  
     
     
         5 . The electric blade sharpener according to  claim 1 , wherein each one of said whetstones is formed with a beveled surface at a corner between the grinding surface and a planar portion that faces a direction in which said cutting tool is moved during grinding of said cutting tool.  
     
     
         6 . The electric blade sharpener according to  claim 1 , wherein at least two whetstones are mounted on each one of said rotary shafts.  
     
     
         7 . The electric blade sharpener according to  claim 6 , wherein said whetstones provided in a direction in which said cutting tool is moved for grinding are arranged so that whetstones on a downstream side of a movement for grinding of said cutting tool is provided with finer grinding surfaces than whetstones on an upstream side.  
     
     
         8 . The electric blade sharpener according to  claim 6 , wherein said at least two whetstones provided on each one of said rotary shafts are arranged so that a whetstone on a downstream side of a movement for grinding of said cutting tool is provided with a finer grinding surface than a whetstone on an upstream side.  
     
     
         9 . The electric blade sharpener according to  claim 6 , wherein said whetstones are respectively mounted on sleeve elements that have same configurations and said sleeve elements are provided on said rotary shafts.  
     
     
         10 . The electric blade sharpener according to  claim 1 , wherein said whetstone is rotated in a direction in which the grinding surface of said whetstone rubs said cutting tool upward during grinding.  
     
     
         11 . The electric blade sharpener according to  claim 1 , wherein said rotary shafts are rotated in the same direction.  
     
     
         12 . The electric blade sharpener according to  claim 1 , wherein said motor is an alternating-current motor.  
     
     
         13 . A sharpener for a cutting tool in which a blade of a cutting tool is brought into a blade insertion groove and grinding is performed by moving the cutting tool, said sharpener is provided with a heel end receiving section formed at one end of said blade insertion groove, said heel end receiving section having a width that is larger than a width of said blade insertion groove that is formed continuously to said heel end receiving section.  
     
     
         14 . The sharpener according to  claim 13 , wherein said heel end receiving section is provided adjacent to where a handle of a cutting tool is located when a blade of said cutting tool is inserted in said blade insertion groove.