Contact type paper counter
US4974237A · kind A · utility
3Cited by
10References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Mar 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06M2207/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A contact sensor apparatus counts associated sheet products as they pass over a generally planar surface. a vacuum source draws a bottom surface of a sheet product onto the planar surface. A contact member is selectively deflected through engagement with the sheet product and deflects upwardly at the passage of the trailing edge of the sheet product. The contact member is connected to a sheet of piezoelectric material that is distorted upon deflection of the contact member. This produces an electrical charge representative of passage of paper over the sensor apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.