Method and apparatus for machine absolute positioning measuremen

Details Method and apparatus for machine absolute positioning measuremen Method and apparatus for machine absolute positioning measuremen

1984-02-06

1986-04-01

Krass, Errol A.

Boots, shoes, and leggings

33 1N, 33 1PT, 364559, 318592, G01C 100

Patent

active

045802092

ABSTRACT:
A method and apparatus for absolute position measurement for numerically controlled machines is provided. The invention produces a unique measurement signal for all locations within the range of a movable machine member using two measuring devices. Each measuring device produces a unique measurement signal within a portion of the range of motion that cyclically repeats over the entire range of motion. The measuring devices are so arranged that the measurement signal of one completes no more than one more cycle over the range of motion than the measurement signal of the other. The difference between the two measurement signals is unique for all locations and is used to produce an absolute position signal.

REFERENCES:
patent: 3668503 (1972-06-01), Linden
patent: 3749997 (1973-07-01), Cohen et al.
patent: 3995206 (1976-11-01), Aronstein et al.
patent: 4360769 (1982-11-01), Selkey et al.

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