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.

Abstract: A knife sharpener includes a housing having one or more access slots for receiving knife blades to be sharpened, one or more grinding wheels rotatably received in the housing and disposed close to the access slots of the housing for grinding and sharpening the cutting edges of the knife blades. The housing includes one or more openings formed in either or both of the end portions of the access slot of the housing and communicating with the access slot of the housing, and having a width greater than that of the end portions of the access slot of the housing, for receiving and preventing the cutting edge of the knife blade from being blunted by the housing after sharpened by the grinding wheel.

Abstract: A knife sharpener includes a handle and an operation portion in which two grinding members are respectively and pivotably received. An aperture is defined through a top of the operation portion and communicates with the grinding members. Each of the two grinding members has a rod extending radially therefrom so as to be engaged with one of two respective spiral grooves of a shaft rotatably received below the grinding members. A positioning member is removably engaged with the shaft. A width between the two grinding members can be adjusted by rotating the shaft.

Abstract: A knife sharpener includes a housing having one or more access slots for receiving knife blades to be sharpened, one or more grinding wheels rotatably received in the housing and disposed close to the access slots of the housing for grinding and sharpening the cutting edges of the knife blades. The housing includes one or more openings formed in either or both of the end portions of the access slot of the housing and communicating with the access slot of the housing, and having a width greater than that of the end portions of the access slot of the housing, for receiving and preventing the cutting edge of the knife blade from being blunted by the housing after sharpened by the grinding wheel.

Abstract: A knife sharpener includes a handle and an operation portion in which two grinding members are respectively and pivotably received. An aperture is defined through a top of the operation portion and communicates with the grinding members. Each of the two grinding members has a rod extending radially therefrom so as to be engaged with one of two respective spiral grooves of a shaft rotatably received below the grinding members. A positioning member is removably engaged with the shaft. A width between the two grinding members can be adjusted by rotating the shaft.

Abstract: A knife sharpening device includes a base with a motor and a gear reduction assembly connected thereto. A main shaft is connected to the gear reduction assembly and two grinding disks are mounted on the main shaft. A separation tube is mounted on the main shaft and located between the two grinding disks. Each grinding disk has a spring urging thereto so as to prevent the grinding disks from shaking. A cover is mounted to the base and has straight slots each of which is in communication between two openings. Each slot includes two narrow ends which communicate with the two openings so that the blades of knives are inserted perpendicularly in the slots and the cutting edge is slightly clamped by the narrow ends.

Abstract: A knife sharpening device includes a base with a motor and a gear reduction assembly connected thereto. A main shaft is connected to the gear reduction assembly and two grinding disks are mounted on the main shaft. A separation tube is mounted on the main shaft and located between the two grinding disks. Each grinding disk has a spring urging thereto so as to prevent the grinding disks from shaking. A cover is mounted to the base and has slots via which the blades of knives are inserted and ground by the grinding disks.