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A knife sharpening machine, using an endless abrasive belt, comprises a pair of guide pulleys around which the belt extends to provide an operative run, with one of the pulleys movable to tauten the belt. A slotted guide in a casing of the machine enables a knife to be presented to the operative run

A knife sharpening machine, using an endless abrasive belt, comprises a pair of guide pulleys around which the belt extends to provide an operative run, with one of the pulleys movable to tauten the belt. A slotted guide in a casing of the machine enables a knife to be presented to the operative run of the belt at a correct angle. The belt and pulleys, as well as an optional resilient support for the operative run of the belt, may all be provided in a removable cartridge.

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In a knife sharpening machine comprising a casing, two guide pulleys mounted for rotation on said casing, drive means for rotating at least one of said guide pulleys, an endless abrasive belt extending around said guide pulleys, tautening means for applying tension to said abrasive belt, said abrasi

In a knife sharpening machine comprising a casing, two guide pulleys mounted for rotation on said casing, drive means for rotating at least one of said guide pulleys, an endless abrasive belt extending around said guide pulleys, tautening means for applying tension to said abrasive belt, said abrasive belt forming between said guide pulleys an operative linear run; the improvement comprising a guide slot for knives, of substantial length and defined by opposite rectilinear parallel side edges of said casing forming an acute angle with said operative run of the abrasive belt, said casing being substantially entirely closed except for said guide slot, whereby in operation a knife to be sharpened is angularly guided by said slot against said operative run of the abrasive belt, and the abrasive belt yields elastically under the pressure exerted by the knife, spontaneously adapting itself to the profile of the knife in course of sharpening, thereby to reduce the danger of injury to a user of the machine and tO reduce the escape of dust from the machine.