Patent ID: 6089957
Filing Date: 2000-07-18
Classification: B24B

Abstract:
An eyeglass lens grinding apparatus for grinding a lens to be fitted in an eyeglass frame, which comprises:a bevel position determining means for determining a position of an apex of a bevel to be formed on the lens being processed;a bevelling abrasive wheel that has a first inclined bevelling surface and a second inclined bevelling surface and which processes front and rear surfaces of the bevel independently of each other, wherein said first inclined bevelling surface is adapted to form the front surface of the bevel and the second inclined bevelling surface is adated to form the rear surface of the bevel, and wherein said first and second inclined bevelling surfaces are adapted to change a size of the bevel by changing respective contact positions of said first and second inclined bevelling surfaces with the lens;a lens rotating shaft that holds and rotates the lens;a bevel calculating means for calculating respective processing points at which said first and second inclined bevelling surfaces process the lens, to thereby calculate two kinds of bevelling data, one for processing the front surface of the bevel and the other for processing the rear surface thereof such that the apex of the bevel being formed contacts said first and second inclined bevelling surfaces in correspondence with the thus calculated processing points, respectively, and such that said first inclined bevelling surface forms the front surface of the bevel without said second inclined bevelling surface contacting the rear surface of the bevel, and such that said second inclined bevelling surface forms the rear surface of the bevel without said first inclined bevelling surface contacting the front surface of the bevel;a bevelling control means for controlling bevelling operation with said bevelling abrasive wheel on the basis of the two kinds of bevelling data as calculated by said bevel calculating means; anda setting means for setting a height or width of the bevel, wherein said bevel calculating means produces the two kinds of bevelling data on the basis of the bevel's height or width as set by said setting means.