Apparatus for cutting aspherical surfaces on contact lenses and

Details Apparatus for cutting aspherical surfaces on contact lenses and Apparatus for cutting aspherical surfaces on contact lenses and

1978-06-19

1981-06-23

Hinson, Harrison L.

Turning

Axial pattern

Pivoted tool rest

B23B 328

Patent

active

042743133

ABSTRACT:
A tool carriage for a lathe which permits guiding the tool to cut aspherical lense-shaped surfaces with desired shape factors with only pivotal carriage movement and no carriage translation during the cutting operation. The tool is pivoted about different centers during successive intervals of arc with smooth but instantaneous transitions from one center to another to provide a smoothly contoured aspherical lense-shaped surface. The tool carriage has at least two relatively rotatable, interfitting eccentric ring members (50 and 52) each having an inner and an outer circular bearing which are eccentric to each other. The tool is supported on an inner bearing member (66) which rotatably mates within the innermost one of the eccentric ring members (50 and 52). The outermost eccentric ring member (52) rotatably mates within an outer bearing member (62) which is mounted to a support frame supported by the base of the lathe. A catch means is attached to the inner bearing member and the eccentric ring members to engage at adjustably selected angles of rotation for effecting the rotation of the eccentric ring members simultaneously with the tool.
A polishing tool (410) is disclosed comprising a flexible polishing membrane (418) mounted at its periphery to a support body (416) and a biasing means (424) mounted to the support body (416) for seating against the membrane (418) for supporting it in a selected contour.

REFERENCES:
patent: 2305055 (1942-12-01), Ashmore et al.
patent: 4051751 (1977-10-01), Estrada
patent: 4083272 (1978-04-01), Miller
patent: 4114486 (1978-09-01), Hooker

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