| 摘要 |
Apparatus for sharpening blade edges or abrading surfaces includes a handle and an abrasive device such as a sharpening stone secured to the handle for reciprocating motion with respect to the handle. The stone is secured to a drive arm which extends into the handle. The drive arm is secured in the handle for reciprocating motion by a pair of spaced pivot bearings. A motor having an offset shaft end oscillates an L-shaped lever inside the handle. The L-shaped lever pivots about a shaft. A load arm of the lever extends through an opening in the drive arm which is between the spaced pivot bearings. Oscillation of the L-shaped lever causes oscillation of the load arm about the shaft, which in turn causes reciprocation of the drive arm and sharpening stone. The sharpening stone moves a selected stroke distance, which is determined by, among other things, the distance between the shaft and the opening in the drive arm. The drive arm is flexible, so that when the load on one side of the stone is increased, the stroke is decreased, and when the load on the other side of the stone is increased, the stroke is also increased. As the stroke increases in this manner, the speed of the stone increase, and as the stroke decreases, the power or torque increases and the speed of the stone decreases.
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