Patent ID: 8167110

Claim:
A coin discrimination apparatus which discriminates a bimetallic coin having a ring part, and a core part provided on an inner side of the ring part and composed of a different material from that of the ring part, comprising: a conveyor which conveys the bimetallic coin, the conveyor including a conveyor path which has a flat conveyor face, an upper face of the conveyor face extending laterally, the conveyor face guiding a bottom face of the bimetallic coin, a pair of conveyor guides which are respectively arranged on two sides in a direction orthogonal to a conveyance direction of said conveyor, and are arranged on the conveyor face, and a conveyor belt which is arranged at an upper side of the conveyor face so as to open a prescribed interval between the conveyor belt and the conveyor face to convey bimetallic coin; a pair of ring sensors which are arranged at positions where only the ring part of the bimetallic coin conveyed by said conveyor transits, and which detect magnetic properties, the pair of ring sensors having similar configurations to each other, the pair of ring sensors arranged laterally symmetrically with each other with respect to the conveyance direction, each of the ring sensors including a transmitting sensor which oscillates and a receiving sensor which receives signals; and a core sensor which is arranged at a position where the core part of the bimetallic coin conveyed by said conveyor transits, and which detects magnetic properties, the core sensor arranged between the pair of ring sensors with respect to the direction orthogonal to the conveyance direction, wherein the transmitting sensor is arranged on an underside of the conveyor face, and the receiving sensor is arranged on the upper side of the conveyor face and arranged opposite the transmitting sensor, a center of the receiving sensor of one of the ring sensors is arranged at a position of a guide wall face running vertically along one of the conveyor guides, and a center of the receiving sensor of the other ring sensor is arranged at a position of a guide wall face running vertically along the other conveyor guide.