US Patent: 3,798,427
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| Automatic Deceleration to Zero Velocity in Iteratively Computing Numerical Control Systems
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Patentee:
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| John P. Connors (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 27, 1973 |
| Granted: |
Mar. 19, 1974 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract
Methods and apparatus embodying improvements in numerical control systems of the genus disclosed in United States application filed 15 Mar., 1971 in the name of John K. McGee, now U.S. Pat. No. 3,727,191 and particularly for simplifying and rendering more accurate the look-ahead sensing and automatic deceleration of a movable element to zero velocity as it reaches a commanded end point position. The velocity of an element moving toward a numerically defined stopping position is successively reduced to a predetermined fraction or percentage of its previous value during each iteration period once deceleration is initiated in response to comparison of the remaining distance to the end point with a distance which will be traveled during the deceleration phase. The latter distance is found by simple computations involving essentially a constant which is derived directly from the said selected, predetermined percentage. As a result of reducing the velocity by the same predetermined percentage during successive equal periods, the velocity falls in a substantially exponential fashion and the deceleration is thus smooth but consumes relatively little time |
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