Patent ID: 8132807

Claim:
In a banknote validator having a banknote drive path and a series of banknote drive rollers for advancing a banknote along said drive path past a series of sensors used to determine the authenticity of the banknote, and a drive train operatively coupled to said drive rollers for coordinated rotation thereof the improvement comprising at least one of said drive rollers being connected to a drive shaft through an intermediary drive ring secured on and rotatable with said drive shaft, said at least one drive roller being freely rotatable on said drive shaft when disengaged from said intermediary drive ring, said at least one drive roller and said intermediary drive ring each including a series of mating adjacent drive surfaces on opposed faces positioned outwardly of and separated from said drive shaft; said at least one drive roller and said intermediary drive ring include a spring bias for urging said drive surfaces into engagement for driving of said at least one drive roller with rotation of said drive shaft and automatically repetitively disengage and engage said mating drive surfaces when a banknote is improperly withdrawn to create an audio deterrent signal.