Method of and apparatus for counting flat objects in a stream of partially overlapping objects
US5005192A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1989 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Sep 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06M2207/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The sheets of a stream of partially overlapping sheets are counted during transport past a generator of ultrasonic waves which is operated by a control unit at a frequency such that each sheet reflects a series of successive waves. The resulting echoes are directed toward two discrete signal generators which transmit signals to an evaluating circuit by way of the control unit. The signals denote the length of intervals of propagation of waves from the source to the respective signal generators, and the circuit processes such signals to furnish information denoting the number of sheets which are conveyed past the locus of impingement of waves upon the sheets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.