Patent ID: 8333636
Filing Date: 2012-12-18
Classification: B24B

Abstract:
1. An eyeglass lens processing apparatus comprising: a lens rotating unit which includes a motor for rotating a lens chuck shaft for holding an eyeglass lens; a grindstone rotating unit which includes a motor for rotating a grindstone spindle attached with a roughing grindstone for roughing a periphery of the lens; an axis-to-axis distance varying unit which includes a motor for varying an axis-to-axis distance between the lens chuck shaft and the grindstone spindle; a sensor unit which includes a sensor for detecting a torque applied to the lens chuck shaft at the time of roughing of the lens by the roughing grindstone, the torque being a rotation torque for rotating the lens chuck shaft; a mode selecting switch which switches and selects a soft processing mode for processing a slippery lens coated with a water-repellent substance and a normal processing mode for processing a lens not coated with the water-repellent substance; a processing control unit which in the normal processing mode, sets a torque threshold value to a value TθN, and controls the axis-to-axis distance varying unit or the lens rotating unit so that the torque detected by the sensor unit is equal to or less than the value TθN, and in the soft processing mode, sets the torque threshold value to a value Tθs lower than the value TθN, and when the torque detected by the sensor unit does not exceed the value Tθs, controls the axis-to-axis distance varying unit or the lens rotating unit so that a cutting amount per rotation of the lens reaches a predetermined cutting amount, and when the detected torque exceeds the value Tθs, controls the axis-to-axis distance varying unit or the lens rotating unit so that the torque becomes lower than the value Tθs to decrease the cutting amount.