Method and apparatus for continuous monitoring and amplitude adjustment of adjustable length heating element
US6223580A · kind A · utility
2Cited by
4References
9Claims
0Family size
Inventor
Key dates
| Filing date | Jan 4, 2000 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Jan 4, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D13/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming a heating element by corrugating a ribbon to a waveform having an amplitude based on a measured resistance per unit length of the ribbon. The amplitude of the corrugation is varied based on the measured resistance, to vary the actual path length of the heating element, shorter based on higher resistance and longer based on lower resistance. The heating element is formed to have a predetermined length dimension. The apparatus comprises a pair of intermeshed gears, with the spacing controlled in accordance with the measured resistance per unit length of the unformed ribbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.