Glass lens edging apparatus for sensing lens holding frames

Claim 1

A lens edging apparatus comprising in combination: a rotatable shaft, a disk fixedly mounted on said shaft for rotation therewith, a plurality of cam means spacedly arranged and slidably mounted on said disk for movement radially thereof, pneumatic means one for each of said cam means mounted between said disk and said cam means for biasing said cam means radially outwardly of said disk, each of said cam means being provided with an arm extending laterally thereof in a common direction, said arm of each of said cam means being movable radially of said disk upon radial movement of said cam means, releasable means for biasing said cam means radially inwardly of the outer periphery of said disk, clamping means mounted on said disk for holding a lens frame around the ends of said arms when they are biased inwardly by said releasable means, said releasable means upon being released causing each arm of said cam means to be biased outwardly until it is stopped by the inner periphery of the lens frame, said cam means when said arms are retained by the lens frame defining a geometrical configuration which is a replica of the inner periphery of the lens frame for sensing by a lens forming machine, a means for sensing the geometrical configuration of said cam means when said arms are retained by the lens frame, and a force multiplying means connected to said sensing means for transmitting information representative of the position of the cam means sensed by said sensing means to the lens forming machine as multiples thereof.