Method and apparatus for detection of an edge of a printing plate mounted on a drum imaging system

A method and apparatus is disclosed to precisely locate an edge (4A) of an imageable plate (4) mounted on a drum (1A) or other support surface. A light source (9A) and light sensor (10A) are used to measure the difference in reflectivity between the plate (4) and the support surface (1B). The drum (...

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Bibliographische Detailangaben
Hauptverfasser:	KIERMEIER, ARNFRIED, ROLFE, NORMAN F
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES,TYPEWRITERS, AND TO STAMPS LINING MACHINES MATERIALS THEREFOR MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS ORIGINALS THEREFOR PERFORMING OPERATIONS PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHYSICS PRINTING PRINTING MACHINES OR PRESSES PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTINGSURFACES STAMPS TESTING TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A method and apparatus is disclosed to precisely locate an edge (4A) of an imageable plate (4) mounted on a drum (1A) or other support surface. A light source (9A) and light sensor (10A) are used to measure the difference in reflectivity between the plate (4) and the support surface (1B). The drum (1A) or support surface (1B) contains at least one groove (3A) to increase the difference in reflectivity between the plate (4) and the support surface (1B). The groove (3A) may also contain an anti-reflecting layer to further increase the difference in reflectivity. The groove (3A) may also have a geometric shape that causes incident light (28,29) to be directed away from the light sensor (30A,30B).