Position measurement apparatus

Details Position measurement apparatus Position measurement apparatus

1974-05-07

1976-06-15

Rubinson, Gene Z.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

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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