US Patent: 3,539,895
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| Apparatus for Controlling the Instantaneous Positions and Velocities of Movable Elements According to Digital Numerical Commands
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Patentee:
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| John K. McGee (exact or similar names) - Houston, Harris County, TX |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 03, 1966 |
| Granted: |
Nov. 10, 1970 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract:
A numerical control for machine tools or the like which is concerned with the control of movable elements to translate them through distances, in directions, and at velocities which correspond respectively to the amount, sense, and average rate of change of dynamically and periodically changing digital command numbers. The digital signal is converted directly into an analogue signal which varies accurately in phase, relative to a reference wave, by direct digital comparison of the command number with a digitally signaled reference number which cyclically changes in synchronism with the reference wave. The reference wave is utilized to create a feedback signal which varies in phase, relative to such reference, according to the sense and extent of the displacement of the movable element, and which is compared with the phase variable commanded signal to create a polarized error signal applied to a servomotor coupled to drive the movable element. |
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