Position measurement apparatus

Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support

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Details

340 21, B66B 302

Patent

active

039630986

ABSTRACT:
Position measurement apparatus which utilizes a digital code to accurately determine the position of a movable body along a travel path. The digital code is selected to provide, for any N consecutive bits of the code, a bit pattern which is unique. Indicia defining the code, and a reader, are arranged for relative motion in synchronism with movement of the movable body. Translating apparatus converts each combination of N consecutive bits read by the reader into an address defining the location of the movable body relative to the travel path. In a preferred embodiment, the digital code is a maximum length digital code, which is conveniently generated by a polynomial generator. The bit length of the code, which is equal to 2.sup.N -1, is selected according to the length of the travel path and the desired resolution.

REFERENCES:
patent: 3414088 (1968-12-01), Bruns et al.
patent: 3483950 (1969-12-01), Simpson

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