| 摘要 |
An apparatus for edging the periphery of an article, such as an ophthalmic lens to a predetermined outline or edge configuration, is characterized by a work holder for supporting and rotating a lens while moving an edge of the lens against a cylindrical grinding wheel. During grinding, the lens is engaged with only a portion of the grinding wheel, and to prevent a groove from being formed in the wheel successive lenses are automatically and periodically engaged with different portions of the wheel. In consequence, the wheel wears evenly, it retains a substantially cylindrical shape, all portions of its grinding surface are effectively used in grinding lenses, and the formation of a groove in its surface is prevented, whereby the wheel does not require retruing or reshaping and its useful life is significantly increased.
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