Position-correctable numerical control system
US4101817A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1976 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | Jul 6, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/42329
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a position-correctable numerical control system for machines without any device for detecting the absolute position of an object to be controlled, a plurality of equidistantly-spaced reference marks providing standard ranges of control of the object are determined by a reference mark detection pulse generator. Reference positions corresponding to the reference marks are stored in advance in a non-volatile memory. The actual position of the object is compared with a reference position stored in said non-volatile memory, each time the object to be controlled passes each of the reference marks, so that the actual position of the object is corrected in accordance with a difference, if any, between the actual position and the reference position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.