Patent ID: 9216569
Filing Date: 2015-12-22
Classification: B41F,G01J

Abstract:
1. Device for offline inspection and color measurement of printed sheets for the production of banknotes and like printed securities, comprising: a console having a supporting surface for supporting a sample printed sheet; a multipurpose measuring apparatus, which multipurpose measuring apparatus comprises multiple sensors including at least one camera for taking images of selected portions of the sample printed sheet and a color measurement sensor for performing spectrophotometric, colorimetric, and/or densitometric measurements at selected locations on the sample printed sheet; a display for displaying the images taken by the camera and the measurements performed by the color measurement sensor; and a control and processing unit coupled to the multipurpose measuring apparatus and the display, wherein the device comprises a moveable sensor beam housing the multipurpose measuring apparatus, which moveable sensor beam is displaceable along an x-axis over the supporting surface of the console and over the entire surface of the sample printed sheet located on the supporting surface, the multiple sensors being mounted on a common sensor head which is displaceable within the moveable sensor beam along a y-axis so that the multipurpose measuring apparatus can selectively take images of selected portions of the sample printed sheet by means of the camera or perform measurements at selected locations on the sample printed sheet by means of the color measurement sensor, wherein the control and processing unit is configured to control displacement of the moveable sensor beam along the x-axis and of the sensor head along the y-axis wherein the camera is capable of taking images of selected portions of the sample printed sheet under white visible light, under infrared (IR) light, and under ultraviolet (UV) light, an operating mode of the camera being switchable selectively between a visible light operating mode, an infrared operating mode, and an ultraviolet operating mode, and wherein the multipurpose measuring apparatus further comprises multiple light sources which are activated individually in dependence of the operating mode of the camera, including a first light source for illuminating the sample printed sheet with white light, a second light source for illuminating the sample printed sheet with infrared (IR) light, and a third light source for illuminating the sample printed sheet with ultraviolet (UV) light.