Device for verifying coins

Claim 1

A device for coin verification, comprising a coin guide (1, 3) with a roll track surface (1) for the coin (2) to be checked and a lateral, steep guide surface (3) along which the coin (2) rolling on the roll track surface (1) slides in contact therewith; at least one inductive probe (5) excited by high frequency and arranged at the guide surface, for scanning on a track (10, 11) on that side of a coin (2) passing along the coin guide (1, 3) which slidingly contacts the guide surface (3) and thereby obtaining a signal (14) constituting information on the portion of the impress design extending along the track (10, 11); a scanner (20) and an analog-to-digital converter (23) connected in circuit with said at least one inductive probe (5), for the derivation of a sequence of digital signals corresponding to discrete values (21) of the signal (14) obtained from the coin to be checked, which discrete values follow one another at identical time intervals; evaluating means (25) including a memory (33) for storing the sequence of digital signals obtained for each track (10, 11) from various starting positions for each coin type acceptable while sliding with one and while sliding with the other coin side along the guide surface (3); and comparison means (34, 36, 38) connected with said analog-to-digital converter (23) and said memory (33) for comparing the signal sequence obtained from the coin (2) to be checked, with each of the stored signal sequences in the memory (33) and yielding a coin design coincidence signal if the signal sequence obtained from the coin to be checked corresponds within certain limits to one of the stored signal sequences.

Claim 2

A device for coin verification, comprising a coin guide (1, 3) with a roll track surface (1) for the coin (2) to be checked and a lateral, steep guide surface (3) along which the coin (2) rolling on the roll track surface (1) slides in contact therewith; at least one inductive probe (5) excited by high frequency and arranged at the guide surface, for scanning on a track (10, 11) on that side of a coin (2) passing along the coin guide (1, 3) which slidingly contacts the guide surface (3) and thereby obtaining a signal (14) constituting information on the portion of the impress design extending along the track (10, 11); a scanner (20) and an analog-to-digital converter (23) connected in circuit with said at least one inductive probe (5), for the derivation of a sequence of digital signals corresponding to discrete values (21) of the signal (14) obtained from the coin to be checked, which discrete values follow one another at identical time intervals; evaluating means (25) including a memory (33) for storing the sequence of digital signals obtained for each track (10, 11) from various starting positions for each coin type acceptable while sliding with one and while sliding with the other coin side along the guide surface (3); and comparison means (34, 36, 38) connected with said analog-to-digital converter (23) and said memory (33) for comparing the signal sequence obtained from the coin (2) to be checked, with each of the stored signal sequences in the memory (33) and yielding a coin design coincidence signal if the signal sequence obtained from the coin to be checked corresponds within certain limits to one of the stored signal sequences.