Eyeglass lens processing apparatus

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

• lens rotating means for holding and rotating the lens;
• a chamfering abrasive wheel rotating shaft axially supporting at least one chamfering abrasive wheel and having a rotational axis different from an axis about which a rough abrasive wheel and a finish abrasive wheel are rotatable;
• moving means for moving the chamfering abrasive wheel between a retreated position and a processing position;
• urging means for urging the chamfering abrasive wheel toward the lens during chamfering processing;
• detecting means for obtaining position data of an edge of the periphery of the lens based on target lens shape data of an eyeglass frame or a template and layout data of the lens with respect to a target lens shape;
• arithmetic means for obtaining position data of a contact point between the lens and the chamfering abrasive wheel with respect to a rotational angle of the lens based on the periphery edge position data thus obtained and configuration data of a processing surface of the chamfering abrasive wheel, and obtaining lens rotational velocity data for making a moving speed of the contact point substantially constant based on the position data of the contact point thus obtained;
• and
• control means for controlling operation of the lens rotating means based on the lens rotational velocity data thus obtained;
• wherein the chamfering abrasive wheel rotating shaft supports the chamfering abrasive wheel and a grooving abrasive wheel coaxially.

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

• a lens processing unit including:
• a lens chuck shaft which holds and rotates the lens;
• a first abrasive wheel rotating shaft which rotates a rough abrasive wheel and a finish abrasive wheel;
• a second abrasive wheel rotating shaft which rotates a chamfering abrasive wheel;
• a moving mechanism which moves the chamfering abrasive wheel between a retreated position and a processing position;
• and
• an urging mechanism which urges the chamfering abrasive wheel toward the lens during chamfering processing;
• an input unit which inputs target lens shape data of an eyeglass frame or a template and layout data of the lens with respect to a target lens shape;
• a lens measuring unit which obtains position data of an edge of the periphery of the lens based on the target lens shape data and the layout data thus inputted;
• and
• an arithmetic control unit which obtains position data of a contact point between the lens and the chamfering abrasive wheel with respect to a rotational angle of the lens based on the periphery edge position data thus obtained and configuration data of a processing surface of the chamfering abrasive wheel, obtains lens rotational velocity data for making a moving speed of the contact point substantially constant based on the position data of the contact point thus obtained, and controls operation of the lens chuck shaft based on the lens rotational velocity data thus obtained;
• wherein the second abrasive wheel rotating shaft supports the chamfering abrasive wheel and a grooving abrasive wheel coaxially.