Security validator

The method of determining the authenticity of a paper offered as a valid security, comprising:

• scanning said paper along at least a first path and obtaining a plurality of test data at preselected points on said paper along said first path;
• comparing said plurality of data with average values of data taken from known valid securities at said points;
• accepting said paper as a valid security if the difference between said test data and said reference values is within a predetermined range;
• and
• wherein said step of comparing is according to the formula ##EQU4## and where X.sub.i is the value of data obtained from a specific area i, X is the average of all X.sub.i 's, .sigma. is the standard deviation of all X.sub.i 's on the paper, and Z.sub.i is the average Z.sub.i for a valid paper.

A note acceptor for receiving and determining the authenticity of a paper security such as a currency, bank notes, and the like, comprising:

• top and bottom plates defining a note path therebetween for receiving a paper offered as a valid security;
• paired top and bottom rollers respectively received by said top and bottom plates in contacting engagement within said note path;
• drive means connected to and driving said bottom rollers;
• sensing means interposed along said note path between said top and bottom plates for acquiring data from specific areas on said paper as it passes along said note path;
• control means interconnecting said drive means and said sensing means for synchronizing the passing of said paper along said note path and the acquisition of data therefrom;
• comparison means operatively connected to and receiving said data from said sensing means and determining the validity of the paper as a function of the difference between said data and reference values obtained from a plurality of valid securities;
• and
• gate means comprising a pivotal gate having a cam surface depending therefrom, said gate means further including a plurality of tines extending from the end of said bottom plate and in juxtaposition to said pivotal gate, said tines alternately angled upward, downward, and in alignment with said bottom plate.

A note acceptor for receiving and determining the authenticity of a paper security such as currency, bank notes, and the like, comprising:

• top and bottom plates defining a note path therebetween for receiving a paper offered as a valid security;
• paired top and bottom rollers respectively received by said top and bottom plates in contacting engagement within said note path;
• drive means connected to and driving said bottom sensing means interposed along said note path between said top and bottom plates for acquiring data from specific areas on said paper as it passes along said note path;
• control means interconnecting said drive means and said sensing means for synchronizing the passing of said paper along said note path and the acquisition of data therefrom;
• comparison means operatively connected to and receiving said data from said sensing means and determining the validity of the paper as a function of the difference between said data and reference values obtained from a plurality of valid securities;
• and
• gate means for preventing the return of the security along the note path, comprising a rotatable drum having a slot passing therethrough in selective alignment with said note path.

A note acceptor for receiving and determining the authenticity of a paper security such as a currency, bank notes, and the like, comprising:

• top and bottom plates defining a note path therebetween for receiving a paper offered as a valid security;
• paired top and bottom rollers respectively received by said top and bottom plates in contacting engagement within said note path;
• drive means connected to and driving said bottom rollers;
• sensing means interposed along said note path between said top and bottom plates for acquiring data from specific areas on said paper as it passes along said note path;
• control means interconnecting said drive means and said sensing means for synchronizing the passing of said paper along said note path and the acquisition of data therefrom;
• comparison means operatively connected to and receiving said data from said sensing means and determining the validity of the paper as a function of the difference between said data and reference values obtained from a plurality of valid securities;
• and
• gate means for preventing the return of the security along the note path, comprising a reciprocating member having a plurality of slots passing therethrough in selective alignment with said note path.

A note acceptor for receiving and determining the authenticity of a paper security such as a currency, bank notes, and the like, comprising:

• p1 top and bottom plates defining a note path therebetween for receiving a paper offered as a valid security;
• paired top and bottom rollers respectively received by said top and bottom plates in contacting engagement within said note path;
• drive means connected to and driving said bottom rollers;
• sensing means interposed along said note path between said top and bottom plates for acquiring data from specific areas on said paper as it passes along said note path;
• control means interconnecting said drive means and said sensing means for synchronizing the passing of said paper along said note path and the acquisition of data therefrom;
• comparison means operatively connected to and receiving said data from said sensing means and determining the validity of the paper as a function of the difference between said data and reference values obtained from a plurality of valid securities;
• and
• anti-jamming means for reciprocatingly moving the paper in said note path.

A note acceptor for receiving and determining the authenticity of a paper security such as a currency, bank notes, and the like, comprising:

• top and bottom plates defining a note path therebetween for receiving a paper offered as a valid security;
• paired top and bottom rollers respectively received by said top and bottom plates in contacting engagement within said note path;
• drive means connected to and driving said bottom rollers;
• sensing means interposed along said note path between said top and bottom plates for acquiring data from specific areas on said paper as it passes along said note path;
• control means interconnecting said drive means and said sensing means for synchronizing the passing of said paper along said note path and the acquisition of data therefrom;
• comparison means operatively connected to and receiving said data from said sensing means and determining the validity of the paper as a function of the difference between said data and reference values obtained from a plurality of valid securities, according to the formula ##EQU5## where X.sub.i is the value of data obtained from a specific area i, X is the average of all X.sub.i 's, .sigma. is the standard deviation of all X.sub.i 's on the paper, and Z.sub.i is the average Zi for a valid paper.

A note acceptor for receiving and determining the authenticity of a paper security such as a currency, bank notes, and the like, comprising:

• top and bottom plates defining a note path therebetween for receiving a paper offered as a valid security;
• paired top and bottom rollers respectively received by said top and bottom plates in contacting engagement within said note path;
• drive means connected to and driving said bottom rollers;
• sensing means interposed along said note path between said top and bottom plates for acquiring data from specific areas on said paper as it passes along said note path;
• control means interconnecting said drive means and said sensing means for synchronizing the passing of said paper along said note path and the acquisition of data therefrom;
• comparison means operatively connected to and receiving said data from said sensing means and determining the validity of the paper as a function of the difference between said data and reference values obtained from a plurality of valid securities;
• and
• wherein said sensing means includes a first photodetector circuit presenting an output signal corresponding to the density of the security itself as it passes along said note path, said sensing means further including second and third photodetector circuits emitting light to and receiving light from said security and presenting output signals corresponding to the light received, the output signals of said first, second, and third photodetector circuits being compared with respective reference signals, providing said data as a ratio between said output signals and said reference signals.