Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1993-12-28
1995-09-05
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250548, G01N 2186
Patent
active
054480795
ABSTRACT:
Device for measuring a position of a sheet edge on an outer cylindrical surface of a rotating cylinder, having at least one photoelectric scanner operating in accordance with the reflection principle, the photoelectric scanner being fixed to a location outside the cylinder and being connected to a control device for positioning a sheet, as well as being directed towards a sheet edge lying along a line formed on an outer cylindrical surface of the cylinder, and towards a label permanently formed in the outer cylindrical surface of the cylinder, the photoelectric scanner including a plurality of photoelectric receiver elements, and the label including a plurality of scanning tracks extending in a direction of movement of the sheet edge, each of the scanning tracks being associated with a respective one of the plurality of photoelectric receiver elements inside the photoelectric scanner, the label being covered by the sheet in a given measurement region.
REFERENCES:
patent: 3948170 (1976-04-01), Ericsson
patent: 4248528 (1981-02-01), Sahay
patent: 4292529 (1981-09-01), Thurston
patent: 4314159 (1982-02-01), Davis
patent: 4641070 (1987-02-01), Pfizenmaier et al.
patent: 5119213 (1992-06-01), Graves et al.
patent: 5124760 (1992-06-01), Knapp et al.
patent: 5262637 (1993-11-01), Cumberledge et al.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
Nichols Steven L.
Westin Edward P.
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