Bertolasi [45] Mar. 11,1980
[54] ANALOG/DIGITAL NUMERICAL CONTROL SYSTEM
[75] Inventor: Robert B. Bertolasi, Rockford, III.
;[73] Assignee: Kelsey-Hayes Company, Romulus, Mich.
[21] Appl. No.: 889,069
[22] Filed: Mar. 22,1978
[51] Int. CI.* G05B 11/18
[52] U.S. Q 318/592; 318/596;
318/612
[58] Field of Search 318/592, 593, 594, 596,
318/612
[56] References Cited
U.S. PATENT DOCUMENTS
2,921,247 1/1960 Morrison 318/596
3,248,622 4/1966 Kelling 318/594
3,665,500 5/1972 Lewis et al 318/596
3,670,228 6/1972 Crosby 318/594
3,723,843 3/1973 Pearson 318/594 X
3,749,997 7/1973 Cohen et al 318/592
3,995,206 11/1976 Aronstein et al ....318/593
Primary Examiner—B. Dobeck
[57] ABSTRACT
An analog/digital numerical control system that utilizes analog techniques to process large scale (macro) differences and digital techniques to process small scale (micro) differences. In this manner, advantage is taken of the respective virtues of both analog and digital processing techniques while avoiding the disadvantages associated with the exclusive use of either approach. In addition, a novel tach responsive braking generator is disclosed for particular use in controlling the positioning of high mass heads that is adapted to provide dynamic braking of the controlled machine assembly to accomplish proper positioning without "hunting".
31 Claims, 4 Drawing Figures
