Control apparatus for a step drive
US4538717A · kind A · utility
3Cited by
11References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1983 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Feb 4, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1488
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a step drive assembly which includes a rotatable operating unit for operating a tool or knife or the like. The assembly has a change-over clutch for selectively connecting the operating unit to a continuously running motor or a brake. Control apparatus for the assembly includes a disk rotatable with the operating unit having teeth and spaces therebetween forming zones and a sensor unit for scanning the zones and outputting a pulse train. An evaluating circuit responsive to the pulse train outputs a positioned stop signal and an overload stop signal to effect a braking operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.