Paper property sensing system
US5934140A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1996 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Jun 19, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00742
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor system for measuring physical properties of a sheet. In one embodiment, the sensor system measures paper curl and thickness using two sensors, each of which includes a member, a base, and measurement circuit. The two members are positioned in opposition to each other and both contact the sheet as it passes between them. Each member is coupled to a base, which includes a measurement circuit. Each measurement circuit measures the displacement of its associated member. In another embodiment, the sensor system measures stiffness and curl using two pairs of opposed sensors. In yet another embodiment, the sensor system measures thermal diffusivity of a sheet of paper using three sensors, one of which includes a heater for heating the sheet of paper and the other two sensors include thermocouples in contact with the sheet of paper for sensing the heat of the paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.