Analog data recording and playback system for path control

Details Analog data recording and playback system for path control Analog data recording and playback system for path control

1975-11-19

1977-10-04

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

G05B 1942

Patent

active

040526534

ABSTRACT:
Movements of a table are optically recorded on film by mechanically gearing movement of the table to rotate a drum provided with a peripheral row of slots positioned above the film. A light is directed through the slots onto the film as the film is moved and the drum rotated thereby exposing the film to bars of light images which are skewed in accordance with the relative rate of rotation of the drum and speed of movement of the film. Playback is accomplished by developing the film and then passing light through the clear film between the new opaque exposed bars of light images on the film and slots in the drum to suitable photo-cells. During playback the film may be moved at a constant speed and the drum will remain in synchronism with the film and in view of its direct gearing to the table, the table will follow movements determined by the pattern on the film. The photo-cells provide signals in response to any tendency of the drum to move out of synchronism with the bars of light images on the film to bring the drum and thus the table movements into synchronism with the recorded program.

REFERENCES:
patent: 2628539 (1953-02-01), DeNeergaard
patent: 2777354 (1957-01-01), Stickney et al.
patent: 2861255 (1958-11-01), Mexhler et al.
patent: 3072833 (1963-09-01), Kerr et al.
patent: 3192796 (1965-07-01), Peeps et al.
patent: 3700992 (1972-10-01), Pontigny

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