1974-10-29
1976-10-19
Simpson, Othell M.
51 33R, 90 31, 90 32, B23C 316
Patent
active
039864332
ABSTRACT:
A programmable machine for automatically cutting and/or resurfacing a selected arcuate pattern upon either a convex or concave lap, particularly such laps as may then be used for forming and polishing opthalmic lenses. A lap positioning unit and a cutter positioning unit are located respectively on adjacent upright and horizontal supports so as to bring the lap and cutter into mutual engagement, each unit initially being longitudinally adjustable from a respective pivot point by a selected amount so as to determine the particular arcuate curvature obtained, which curvatures jointly form the two-dimentional arcuate pattern chosen for the lap face. In operation, the lap is oscillated vertically and a rotary milling cutter is driven back and forth transverse thereto. Each unit is associated with a longitudinal cam plate or guide of distally converging taper, the opposite edges of which serve to jog a contact roller which triggers a corresponding reversing switch, thus automatically limiting the length of swing of the particular unit. The arcuate stroke length of the oscillating lap and of the cutter are thus correlated with the amount of displacement from the particular pivot point.
To change between concave and convex work surfaces, the lap-carrying unit and the cutter-carrying unit may each be rotated 180.degree. on their respective axes so that when brought together again each faces the opposite direction. An electric motor drives the rotary milling cutter, the oscillatory movements of the positioning units being effected hydraulically, and electric programming means enabling the machine to continue the set pattern to the end of a run and then return to starting position before shutting itself off, thus enabling an operator to replace successive workpieces (laps) in a series of such machines operating in sequential cycles.
REFERENCES:
patent: 2297551 (1942-09-01), Greve
patent: 2599759 (1952-06-01), Gunning et al.
patent: 2633675 (1953-04-01), Ellis
patent: 2660930 (1953-12-01), De Vlieg et al.
Strasbaugh Alan E.
Walsh Thomas A.
Bilinsky Z. R.
Johnson Howard L.
R. Howard Strasbaugh, Inc.
Simpson Othell M.
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