Numerical control apparatus of machines
US5153490A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Mar 19, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/41079
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a machine tool having a table adapted to support a workpiece, a plurality of drive shafts for moving the table in three directional directions by servomotors, servo control apparatus controlling the servomotors in response to position instructions, drive shaft control apparatus including position detectors of the servomotors, each drive shaft control apparatus is made up of a servomotor rotation reversal detector for producing a movement reversal signal, a memory device for storing correction amounts necessary to compensate for a position error of the axis of the spindle of the machine tool which occurs as a result of reversal of the direction of movement of the drive shaft and other drive shafts and a transfer switches for selecting the memory device in response to the movement reversal signal and for feeding back to the servo control apparatus the correction amount read out from the memory device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.