Method and spectacle lens grinding machine for shape grinding th

Details Method and spectacle lens grinding machine for shape grinding th Method and spectacle lens grinding machine for shape grinding th

1997-04-25

1999-11-30

Morgan, Eileen P.

Abrading

Abrading process

Glass or stone abrading

451 42, 451255, 451256, B24B 4900

Patent

active

059932945

ABSTRACT:
In a method for shape grinding a circumferential edge of a spectacle lens, and optionally subsequently facet grinding, in a lens grinding machine that comprises a lens securing shaft and a grinding wheel moveable in a controlled manner relative to the lens securing shaft, the grinding pressure is increased for a decreasing radius of the spectacle lens measured from the rotational axis of a lens securing shaft to a respective contacting location of the spectacle lens at the grinding wheel. The spectacle lens grinding machine for performing the method includes a machine frame, a lens securing shaft and a grinding wheel rotatably supported in the machine frame, a control motor connected to the machine frame for advancing the grinding wheel toward the lens securing shaft, and a computer for controlling the control motor. A travel sensor for detecting the advancing stroke of the grinding wheel toward the lens securing shaft is provided. The travel sensor includes a data transmitting line to the computer. The grinding pressure is computer-controlled based on the radius at the contacting location at the grinding wheel and data transmitted by the travel sensor. The grinding pressure is changed by changing the torque of the control motor.

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patent: 5148637 (1992-09-01), Byron
patent: 5347762 (1994-09-01), Shibata et al.
patent: 5630746 (1997-05-01), Gottschald et al.

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