Device for verifying coins
US4819780A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Mar 25, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In order to check whether the coin (2) has the impress design of an acceptable coin, the coin surface is scanned along a track (10) by an inductive probe (5), thus producing a signal which corresponds to the depth of the impression along the track (10). The relative movement of the probe (5), which is needed for scanning, in relation to the coin (2) is obtained as the coin (2) rolls past the probe (5). A memory stores, as comparison signals, signals obtained at mutually displaced tracks (10, 11) of the obverse side and reverse side of each acceptable coin. These signals are obtained as each coin to be verified rolls past the probe (5) from various starting positions. The verification signal received from the coin to be checked is compared with each of the stored comparison signals. If one of these comparisons results in coincidence within specific limits, then a coincidence signal is transmitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.