Knife sharpener

Abstract

An electric sharpener includes a body having a reception area for receiving a driving device, and a sharpening area in which a gear set is located which is connected with the driving device. A shaft is located in the sharpening area and connected to the gear set. A rough sharpening set connected to the shaft and has a first spring unit. A fine sharpening set is connected to the shaft and has a second spring unit. The first and second spring sets have different spring forces applied to the rough sharpening set and the fine sharpening set.

1 . An electric sharpener comprising:
 a body having a reception area and a sharpening area;   a driving device located in the reception area;   a gear set located in the sharpening area and close to the reception area, the gear set connected with the driving device;   a shaft located in the sharpening area and connected to the gear set;   a rough sharpening set connected to the shaft and located beside the gear set, the rough sharpening set having a first spring unit and a first sharpening unit, the first spring unit comprising a first left spring and a first right spring, the first sharpening unit located between the first left spring and the first right spring, the first sharpening unit comprising a first left grinding disk and a first right grinding disk, the first left grinding disk contacting the first left spring and the first right grinding disk contacting the first right spring, a first fixing ring located between the first left grinding disk and the first right grinding disk, a first positioning plate located in the first right grinding disk and the first right spring contacting the first positioning plate, the first left grinding disk and the first right grinding disk being two circular plates, the first right grinding disk being inserted into a recessed area of the first left grinding disk;   a fine sharpening set connected to the shaft and located beside the rough sharpening set, the fine sharpening set having a second spring unit and a second sharpening unit, the second spring unit comprising a second left spring and a second right spring, the second sharpening unit located between the second left spring and the second right spring, the second sharpening unit comprising a second left grinding disk and a second right grinding disk, the second left grinding disk contacting the second left spring and the second right grinding disk contacting the second right spring, a second fixing ring located between the second left grinding disk and the second right grinding disk, a second positioning plate located in the second right grinding disk and the second right spring contacting the second positioning plate, the second left grinding disk and the second right grinding disk being two circular plates, the second right grinding disk being inserted into a recessed area of the second left grinding disk, the first and second spring sets having different spring forces, and   the shaft having a first flange, a second flange and a third flange mounted thereto, the first flange located and in contact between the first spring unit and the second spring unit, the second flange located such that the first spring unit contacts the second flange, the third flange located such that the second spring unit contacts the third flange.   
     
     
         2 . The sharpener as claimed in  claim 1 , wherein the sharpening area comprises a first slot and a second slot, the rough sharpening set is located beneath the first slot and the fine sharpening set is located beneath the second slot. 
     
     
         3 . The sharpener as claimed in  claim 2 , wherein each of the first and second slots communicates with a groove.