Method of sensing position of movable body and apparatus therefo

Details Method of sensing position of movable body and apparatus therefo Method of sensing position of movable body and apparatus therefo

1980-12-30

1983-08-30

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318626, 318467, 364474, G05B 1928

Patent

active

044019300

ABSTRACT:
The present invention relates to improvements in a method of sensing a position of a movable body by directly or indirectly converting a unit movement of the movable body into digital pulse signals and an apparatus therefor. A reference position is selected at a point, at which said movable body abuts against and presses a stopper provided at a specific position within the moving range thereof. The pulse signals are counted as the movable body moves from the stopper using the reference position as a reference number. The coincidence of the number of the pulse signals counted with a first predetermined pulse number corresponding to a predetermined position is sensed so as to sense the fact that the movable body has reached a predetermined position and position sensing signals are emitted. Further, as necessary, the position sensing signals that have been emitted are sustained for the duration of a second predetermined pulse number corresponding to a predetermined stroke preset so that the position sensing signals indicate that the movable body has reached the predetermined position and is within a predetermined stroke from the predetermined position.

REFERENCES:
patent: 3445640 (1969-05-01), Harrison et al.
patent: 4023084 (1977-05-01), Owa
patent: 4266171 (1981-05-01), Mashimo
patent: 4322669 (1982-03-01), Fukuma
patent: 4345131 (1982-08-01), Semon et al.
"Programmable Limit Switch", Catalog, date appears to be Mar. 16, 1978.

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