The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 1999
Filed:
Apr. 25, 1997
Lutz Gottschald, Meerbusch, DE;
Wernicke & Co. GmbH, Dusseldorf, DE;
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.