Apparatus for centering and placing an adapter on an optical lens blank and for controlling a grinder

Claim 1

A process for adjusting the position of an optical lens blank relative to a template or to a rim of a frame of spectacles and for centering an adapter on the center of rotation of the blank, said process comprising displaying a full-scale image of a frame of spectacles or of a template on a flat electronic screen showing orthogonical axis X, Y and connected to an electronic computer, bringing the image of a rim of the frame into a reference position, moving said image along said axis through a distance corresponding to the value of the pupillary spacing of the wearer, and adjusting the position of the image in height in the direction of axis Y as a function of the height of the pupil relative to the base of the frame, placing the lens blank on the screen in coincidence with said reference position, checking that the image of the frame does not extend beyond the blank, and placing an adapter on the optical axis of the lens.

Claim 3

An apparatus for centering and placing an adapter on an optical lens blank and for automatically establishing data required for the grinding of the blank on a grinder, and adapted to directly control the grinder, said apparatus comprising a bank of data stored in a memory, a computer including an electronic display screen which is flat, a mechanical adapter placing device, means for displaying and displacing on said screen an image, stored in said bank, of a frame of spectacles or of a given template, and means for recording displacements of said image on the screen, storing in memory differences between the final coodinates of the image with respect to a reference position constituted by the intersection of two orthogonal axes X,Y and calculating data resulting therefrom and applying said data directly to a grinder.

Claim 4

An apparatus for centering and placing an adapter on an optical lens blank and for automatically establishing data required for the grinding of the blank on a grinder, and adapted to directly control the grinder, said apparatus comprising a bank of data stored in a memory, a computer including an electronic display screen which is flat, a mechanical adapter placing device, means for displaying and displacing on said screen an image, stored in said bank, of a frame of spectacles or of a given template, and means for recording displacements of said image on the screen, storing in memory differences between the final coodinates of the image with respect to a reference position constituted by the intersection of two orthogonal axes X,Y and calculating data resulting therefrom and applying said data directly to a grinder.