| 摘要 |
A grinding wheel for sharpening elongated blades, such as those used for automatic fabric cutting machines, has a planar reference surface or face, and at least one surface depressed from the reference surface, all of the surfaces being coated with abrasive. In one embodiment, the grinding wheel has a radially extending cutting face, circular in elevation, with an outermost, annular, radially planar reference surface along and extending radially inboard from a radially outer edge of the face, and a second annular surface contiguous and concentric with said first surface, the second surface being radially planar and inboard radially of the outermost annular surface and axially recessed with respect to the outermost annular surface. The annular surfaces are coated with abrasive grains either of the same size or of different sizes, in the latter case, with the grain size of the abrasive grains in the inner of the surfaces being larger than the grain size on the outer surface by an amount approximately the depth of the step between the first and second annular faces. In another embodiment, a multiplicity of surfaces is provided, successively axially inwardly stepped from the radially outer surface to the radially innermost surface. In still another embodiment, the reference surface extends across the full width of the cutting annulus of the wheel, and is provided with grooves.
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