DEFECT DETECTION FOR PRINT MEDIA

An apparatus (20) for defect (D) detection in a printing system comprises an emitter (23) for emitting a signal towards a medium (S). A sensor assembly (25) is arranged for receiving at least part of the first emission signal reflected (R) from the medium. The apparatus is arranged for identifying a...

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Bibliographische Detailangaben
Hauptverfasser:	VAN ACQUOIJ, Catharinus, JANSSEN, Cornelius M.F
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LINING MACHINES MEASURING PERFORMING OPERATIONS PHYSICS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TESTING TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	An apparatus (20) for defect (D) detection in a printing system comprises an emitter (23) for emitting a signal towards a medium (S). A sensor assembly (25) is arranged for receiving at least part of the first emission signal reflected (R) from the medium. The apparatus is arranged for identifying a deformation in the medium from the received part of the first emission signal, and for determining a medium as suitable for printing when the first emission signal is substantially prevented from reaching the sensor assembly. A medium is determined to be suitable for printing when no signal reaches the sensor assembly. When the received signal exceeds a predefined reference, the apparatus determines a sheet to be unsuitable for printing. This configuration requires no strict alignment between the emitter and the sensor assembly, and is accurate despite vibrations and the like in the printing system.