Device for ending the feed movement of a grinding wheel
US3978624A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1975 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | May 7, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B47/20
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Means for terminating the infeed of a machine tool, particularly a grinder. An electrode is imbedded within the tool and is exposed at the active surface thereof, such as the grinding surface of a grinder, and a sensing voltage is placed between said electrode and the workpiece. Suitable switching means is placed within the circuit of said electrode and workpiece which switching means will be activated upon the occurrence of a spark between said electrode and the workpiece. Activation of said switching means then activates further means to terminate the infeed of the tool. The circuitry supplying the voltage aforesaid may include a transformer having a plurality of output taps by which a plurality of voltages may be applied between the electrode and the workpiece and such circuitry will in such case include switching means automatically responsive to said different selected voltages. Thus, one voltage may be utilized at a first distance for terminating a rapid infeed, the occurrence of a spark at such distance then terminating the rapid feed, imposing a second and lesser voltage between the tool and the workpiece, and activating a creep feed and finally activating a switch sensitiv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.