Rotational planar chart recorder and chart therefor
US5019838A · kind A · utility
7Cited by
8References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1988 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Oct 27, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D9/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A chart recorder is described for recording parameters such as temperature and humidity on rotating planar charts. Pens, which are used to form traces on a chart as this is rotated, are moved by pen actuators along travel paths that are parallel to a straight radius relative to the axis of chart rotation. The pen actuators are electrically moved under the control of a microprocessor to positions as determined by representative of parameter values. Various mechanical and electrical control features are described whereby pen motions are caused intermittently so as to preserve battery power and achieve long term portable operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.