Coin inspecting apparatus
US4124111A · kind A · utility
77Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1976 |
| Grant date | Nov 7, 1978 |
| Priority date | — |
| Expiry date | Dec 2, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a coin inspecting apparatus wherein two secondary coils of a differential transformer are disposed along a coin passage and connected in series opposition, the secondary coils are disposed with a spacing smaller than the diameter of the coin and the level of the output of the secondary coils is detected to determine the diameter of the coin. In a modification two sets of the secondary coils are provided to inspect not only the diameter but also the material and the surface pattern of the coin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.