Main-shaft malfunction-state detector in an air bearing type machine tool
US5877408A · kind A · utility
1Cited by
4References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1997 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Apr 22, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2322/39
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A main-shaft malfunction-state detector in an air bearing type machine tool, in which an abnormal contact of a main shaft with a housing is reliably and automatically detected. The contacting state of the main shaft 11 and the housing 13 is detected through the presence of electric conductivity by a contact detection means 31. A contact decision means 32 determines the contact of the main shaft 11 with the housing 13 based on the detected conductivity, thus automatic and certain preventative measures, such as the main shaft of the machine tool stops and so on, are based on the above decision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.