US 5,803,793 AGranted

Lens grinding apparatus having chamfering and other grinding wheels mounted on the same shaft

AssigneeNidek Co., Ltd.

InventorsToshiaki Mizuno, Ryoji Shibata, Masahiko Kobayashi, Yoshinori Matsuyama, Hirokatsu Ohbayashi, Masakazu Funakura

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Abstract

A subject lens is held by two chuck shafts, which are rotated synchronously by pulse motors during a grinding operation. Chamfering and other grinding wheels are mounted on a rotary shaft of a lens grinding part. A desired grinding wheel for each processing is selected by moving the rotary shaft vertically. In the case of rough processing, the rotary shaft is moved by a pulse motor toward the center of the chuck shafts based on lens frame shape data. In the case of chamfering, the rotary shaft is moved toward the center of the chuck shafts as well as vertically based on chamfering data. To produce part of the chamfering data, a lens measuring section measures the shapes of the front and rear surfaces of the subject lens.

Claims7

Dependent claims

A lens grinding apparatus for performing frame-fit processing on an eyeglass lens, comprising:

input means for obtaining data for the frame-fit processing including lens edge position data;
means for calculating processing data based on the data obtained by the input means;
lens holding shafts for holding a subject lens in between;
means for rotating the lens holding shafts;
a grinding-wheel shaft on which a grinding wheel for lens edge grinding in rough processing and in bevel processing and a grinding wheel for chamfering are mounted coaxially;
wherein said grinding wheel for chamfering has a first grinding wheel for chamfering a front side of the lens and a second grinding wheel for chamfering a rear side of the lens;
wherein a maximum diameter of each of said first and second grinding wheels is substantially equal to a maximum diameter of said grinding wheel for lens edge grinding in rough processing and in bevel processing;
and
wherein each of said first and second grinding wheels is located at an outermost position with respect to said grinding wheel for lens edge grinding in rough processing and in bevel processing;
means for rotating the grinding-wheel shaft on its axis;
moving means for moving the grinding-wheel shaft toward a rotation axis of the lens holding shafts, and for moving the grinding-wheel shaft in a longitudinal direction thereof relative to the subject lens, to grind or chamfer the subject lens;
and
control means for controlling the grinding-wheel shaft moving means based on the processing data in rough and bevel processing and chamfering.

10 more elements

Dependencies are inferred from the claim text.