초록 ▼

Test apparatus for value sheets (e.g. currency notes) comprises optical sensors (16; 116), a path along which the sheet is transported past the sensors, and reference devices (46, 146) carrying reference surfaces (48; 148) having predetermined optical characteristics, for example, for calibration of

Test apparatus for value sheets (e.g. currency notes) comprises optical sensors (16; 116), a path along which the sheet is transported past the sensors, and reference devices (46, 146) carrying reference surfaces (48; 148) having predetermined optical characteristics, for example, for calibration of the optical sensor. Each reference device is rotatable to facilitate rapid movement of the sheet past the optical sensors. The transportation path may be defined by entry and exit guides. Alternatively it may be defined by upper and lower guides (20, 22) of spaced apart wires (24, 32) which do not substantially obscure the surfaces of sheet or the reference surfaces, from the optical sensors. Guide rollers (54, 58, 154, 158) project through spaces between the wires to advance the sheet. An automatic cleaning device is operable to clean the reference surfaces.

대표청구항 ▼

[ We claim:] [1.] Value sheet testing apparatus comprising an optical sensor, a path along which a value sheet is transported past said optical sensor for testing by said optical sensor, and a reference device adjacent to said path and bearing a reference surface used for calibrating said optical se

[ We claim:] [1.] Value sheet testing apparatus comprising an optical sensor, a path along which a value sheet is transported past said optical sensor for testing by said optical sensor, and a reference device adjacent to said path and bearing a reference surface used for calibrating said optical sensor, wherein said reference device is movable such that, in use, at least a portion of said reference surface adjacent to a said value sheet moving in said path moves generally in the same direction as the direction of travel of said value sheet in said path.