Importance

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Abstract

A method and apparatus for aligning a lens blank upon a lens blocking device. The apparatus comprises a transparent aligning member, attached by arm means to a stanchion on the lens blocking machine. Vertically aligned perpendicular intersecting linear indicia are imprinted upon the upper and lower surfaces of the transparent member for vertically aligning an underlying lens without introducing a parallax error. A lens retaining member is also carried by the stanchion and is selectively pivoted into position to retain the aligned lens blank for blocking. The method consists of rotating a lens blank upon a lens blocking machine until perpendicularly intersecting linear indicia on the surface of the lens are vertically aligned with perpendicularly intersecting indicia on the upper and lower surfaces of a transparent aligning member. Once alignment is achieved the transparent aligning member is rotated away and a retaining member is rotated into position and biases the lens blank against the lens blocking apparatus.

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First Claim