Machine for grinding of toric surfaces on optic lenses

Claim 1

In a machine for grinding of toric surfaces on optic lenses having a machine frame, a first holder and a second holder, a headstock having a tool spindle which carries a cup tool mounted on one of said first and second holders and a receiving mechanism, for the lens which is to be worked, mounted on the other of said first and second holders, said first holder being pivotal about a first axis, first adjusting means for adjusting the distance between said first axis and a cutting point on said cup tool so that the distance corresponds with the desired radius of a base curve of said torus surface, and second adjusting means for adjusting said second holder so that the desired radius of a transverse curve of said torus surface is adjusted about a second axis, the improvement comprising wherein said second holder has a bearing ring which is rotatably supported on said machine frame and which encircles said compound support means, wherein a compound support means is provided on said frame means, said compound support means including a pair of carriages, each supported for rectilinear movement along mutually perpendicular axes, wherein rotatable support means is provided on said compound support means for rotatably supporting said first holder about said first axis, said first holder having a swivel arm which is connected fixed against rotation thereto and arranged below a swivel-arm bearing means movable along the length of said swivel arm, said swivel-arm bearing means consisting of a swivel-arm holder mounted on and being rotatable relative to said machine frame and with said swivel arm, locking means for locking said swivel-arm holder to said machine frame and said swivel arm and a swivel-arm bearing block nonrotatable relative to said machine frame, however, is linearly movable on said frame means and is positionally lockable on said frame means.