Abstract: The invention relates to a sensor for checking value documents with a detection device having at least two photodetectors through which the detection light of the value document is detectable in at least two different spectral regions. The detection device contains a collecting optic common to the photodetectors, through which the detection light emitted by the value document in a detection region can be collimated to a light beam. Each of the photodetectors has associated therewith a detector lens which receives a partial light beam of the light beam collimated by the collecting optic and directs it onto the respective photodetector, so that the detection region substantially coincides for the different photodetectors. By the sensor there can be detected different spectral portions of the detection light of the same detection region separately from each other at the same point in time.

Abstract: A sensor device in a banknote processing machine comprising a transport device by means of which banknotes to be processed are transported past the sensor device, a cleaning device that cleans the sensor device or a transparent region of the sensor device, and a control device that controls the components of the banknote processing machine. The sensor device includes means for enlarging the spacing between the transport device and the sensor device. The control device controls the means and the cleaning device in such a way that the spacing between the transport device and the sensor device is enlarged by the means while the cleaning device cleans the sensor device.

Abstract: The invention relates to a sensor for checking value documents with a detection device having at least two photodetectors through which the detection light of the value document is detectable in at least two different spectral regions. The detection device contains a collecting optic common to the photodetectors, through which the detection light emitted by the value document in a detection region can be collimated to a light beam. Each of the photodetectors has associated therewith a detector lens which receives a partial light beam of the light beam collimated by the collecting optic and directs it onto the respective photodetector, so that the detection region substantially coincides for the different photodetectors. By the sensor there can be detected different spectral portions of the detection light of the same detection region separately from each other at the same point in time.

Abstract: A sensor device in a banknote processing machine comprising a transport device by means of which banknotes to be processed are transported past the sensor device, a cleaning device that cleans the sensor device or a transparent region of the sensor device, and a control device that controls the components of the banknote processing machine. The sensor device includes means for enlarging the spacing between the transport device and the sensor device. The control device controls the means and the cleaning device in such a way that the spacing between the transport device and the sensor device is enlarged by the means while the cleaning device cleans the sensor device.

Abstract: An apparatus for determining the fitness of a bank note by sensing the bank note transported along a transport path by a transport device. The apparatus includes a plurality of identical sensor and illumination units positioned along each side of the transport path whereby the sensor and illumination units are focused at a single predetermined section of the transport path.

Abstract: A method and apparatus for testing a paper of value, in particular for condition testing of a bank note, are proposed wherein the bank note is subjected both to dark-field measurement and to bright-field measurement. From comparison of the measuring results of dark-field measurement and bright-field measurement one can make a clear statement about whether a flaw, for example a hole, tear, etc., is present in the bank note in the tested area. The bright-field and dark-field measuring devices can be formed separately with one LED array and detector array in each case. However, preferred embodiments provide for either a common LED array with two detectors or two LED arrays with a common detector. If two LED arrays are used, the dark-field radiation source is preferably formed as an IR light source and the bright-field radiation source as a red-light radiation source in order to permit authenticity testing of the paper of value to be performed as well as condition testing thereof. (FIG.

Abstract: The invention relates to an apparatus for examining documents of value, in particular bank notes, with one or more light-emitting diodes (10) for illuminating a document of value (1) under examination with light emitted by the light-emitting diodes (10) and at least one detector device (30) for detecting light (31) emanating from the document of value (1).

Abstract: The invention relates to a method for checking the state of an apparatus for testing sheet material having at least one illumination device, transparent measuring window and detector. For ascertaining the soiling of a measuring window according to the invention the latter is irradiated with UV light by an illumination device, the UV light transmitted through the measuring window being filtered by a UV filter such that only a small fraction passes the filter and reaches a detector. Said fraction of UV light transmitted through the filter is detected and evaluated for determining the degree of soiling of the measuring window.

Abstract: The present invention relates to an apparatus and method for checking bank notes for their state of use, in particular dirt and stains which can impair the service value of the bank notes.