| 摘要 |
PROBLEM TO BE SOLVED: To facilitate management of the appropriate dressing period of a grinding wheel. SOLUTION: In this spectacle lens working device for working the peripheral edge of a spectacle lens retained at a rotating shaft, a working advance condition is detected according to conditions such as when the working of the whole periphery of the lens is not completed within a reference time, or when the working at a rotational angle of the lens is not completed within a predetermined reference time, thus detecting degradation of the working performance of the grinding wheel and indicting that the grinding wheel needs dressing on a display.
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