Variable temperature recording stylus
US4139854A · kind A · utility
6Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1977 |
| Grant date | Feb 13, 1979 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D15/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The resistive stylus in a thermographic strip chart recorder is connected by way of an adjustable selector switch to taps of an auxiliary secondary winding added to the D.C. inverter customarily used to power the recorder's pen motor. The amount of current to the stylus and thus the stylus temperature may be varied in accordance with recorder chart speed by adjusting the selector switch to connect the desired number of secondary winding turns to the stylus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.