Lens grinding apparatus

A lens grinding apparatus for processing a periphery of an eyeglass lens, comprising:

• input means for entering data on a processing shape of the lens;
• detecting means for detecting an edge position of the lens on the basis of the data entered into said input means;
• first calculating means for determining processing data on a rough and a fine processing of the lens on the basis of the edge position detected by said detecting means and the data entered into said input means;
• chamfering means which has a chamfering grinding wheel for chamfering angular edge portions of the finely processed lens and for moving a shaft of said chamfering grinding wheel relative to a shaft holding the lens;
• second calculating means for varying an amount of chamfer in correspondence with a radius vector angle of the lens on the basis of the processing data obtained by said first calculating means;
• and
• means for controlling the processing of the lens on the basis of the results of calculation by said first and second calculating means.

A lens grinding apparatus for processing a periphery of an eyeglass lens, comprising:

• input means for entering data on a processing shape of the lens;
• detecting means for detecting an edge position of the lens on the basis of the data entered into said input means;
• first calculating means for determining processing data on a rough and a fine processing of the subject lens on the basis of the edge position detected by said detecting means and the data entered into said input means;
• chamfering means which has a chamfering grinding wheel with conical grinding surfaces for chamfering angular edge portions of the finely processed lens and for moving a shaft of said chamfering grinding wheel relative to means for holding the lens;
• means for determining a chamfering locus in correspondence with a radius vector angel of the lens;
• second calculating means for determining a reference chamfering locus on the basis of said chamfering locus;
• third calculating means for determining a corrected locus by correcting said reference chamfering locus such as to ensure that the chamfering grinding wheel will not interfere with the lens holding means;
• fourth calculating means for determining a chamfering position for successive angles of rotation on the basis of said corrected locus and said chamfering locus;
• and
• means for controlling the rough and fine processing by said processing data and for controlling the chamfering operation on the basis of said chamfering position and said corrected locus.

A lens grinding apparatus for processing a periphery of an eyeglass lens, comprising:

• an input unit to enter data on a processing shape of the lens;
• a lens thickness measuring section which detects an edge position of the lens on the basis of the entered shape data;
• a control unit which performs a first calculation to determine processing data on a rough and a fine processing of the lens on the basis of the edge position detected by said lens thickness measuring section and the shape data entered into said input unit;
• an angular edge portion processing mechanism which has a grinding wheel to process angular edge portions of the finely processed lens and which moves a shaft of said grinding wheel relative to a shaft holding the lens;
• wherein said control unit performs a second calculation to set a plurality of zones of the lens and performs different calculations in different zones such that an amount of processing of the angular edge portions is determined in correspondence with a radius vector angle of the lens;
• and
• wherein said control unit controls the processing of the lens on the basis of the results of said first and second calculations.

A lens grinding apparatus for processing a periphery of an eyeglass lens, comprising:

• an input unit to enter data on a processing shape of the lens;
• a lens thickness measuring section which detects an edge position of the lens on the basis of the data entered into said input unit;
• a control unit which performs a first calculation to determine processing data on a rough and a fine processing of the lens on the basis of the edge position detected by said lens thickness measuring section and the data entered into said input unit;
• a chamfering mechanism which has a chamfering grinding wheel and which chamfers angular edge portions of the finely processed lens and which moves a shaft of said chamfering grinding wheel relative to a shaft holding the lens;
• wherein said control unit performs a second calculation which varies an amount of chamfer in correspondence with a radius vector angle of the lens on the basis of the processing data obtained by said first calculation;
• and
• wherein said control unit controls the processing of the lens on the basis of the results of calculation by said first and second calculations.

A lens grinding apparatus for grinding a periphery of an eyeglass lens, comprising:

• input unit to enter data on a processing shape of the lens;
• a lens thickness measuring section which detects an edge position of the lens on the basis of the data entered into said input unit;
• a control unit which performs a calculation to determine processing data on a rough and a fine processing of the lens on the basis of the edge position detected by said lens thickness measuring section and the data entered into said input unit;
• a chamfering mechanism which has a chamfering grinding wheel with conical grinding surfaces for chamfering angular edge portions of the finely processed lens and which moves the shaft of said chamfering grinding wheel relative to a lens holding mechanism;
• wherein said control unit further determines a chamfering locus in correspondence with a radius vector angel of the lens;
• and
• wherein said control unit further:
• determines a reference chamfering locus on the basis of said chamfering locus,
• performs a third calculation to determine a corrected locus by correcting said reference chamfering locus such as to ensure that the chamfering grinding wheel will not interfere with the lens holding mechanism;
• performs a fourth calculation to determine a chamfering position for successive angles of rotation on the basis of said corrected locus and said chamfering locus;
• controls the rough and fine processing by said processing data;
• and
• controls the chamfering operation on the basis of said chamfering position and said corrected locus.