Abstract: An optical recognition device for recognizing a certain type of sheets, e.g. money, includes at least one light source, at least one diverge device, at least two optical sensors, and a recognition circuit. The diverge device changes the course of light emitted from the light source into two separate lights on the sheet to be recognized. The optical sensors separately collect two response images from the sheet and the recognition device recognizes the sheet with the two response images.

Abstract: The present invention describes an apparatus for preventing extraction of a bill from a money exchange machine. This apparatus uses a main roller, an auxiliary roller, two supporters, a lead board and a protection board. The two ends of both the main roller and the auxiliary roller are set in the two supporters for rotation. The main roller and the auxiliary roller rotate in opposite directions and a channel exists between them. The main roller is made of a plurality of round boards. A bump is extends from part of the surface of each round board. A lead board is located behind the main roller. A channel is formed between the main roller and the lead board.