Method and apparatus for automatically inscribing magnetic marks on a wireline
US4190868A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 19, 1977 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Oct 19, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B13/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for automatically inscribing magnetic marks on a moving wireline are disclosed. An alternating magnetic field is generated for application to a zone on the moving wireline. The marks are inscribed on the wireline by interrupting the field in response to a control signal corresponding to the time for a mark. The interruption is synchronized to alternations of the field and movement of the wireline. The interruption begins between alternations of the field and is maintained for a time sufficient for a predetermined length of the wireline to be moved beyond the application zone. This predetermined length is related to the length of the zone on the wireline affected by the alternating magnetic field, which is applied with a U-shaped electromagnet held in proximity to the wireline. Wireline movement pulses are generated by a tangentially coupled measuring wheel driving an encoder. The movement pulses are counted to determine the time for each mark and provide a control signal corresponding to a desired mark. The pulses are also used to determine when the predetermined length of wireline has been moved beyond the application zone and when the interruption of the fiel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.