Printing – Work supporting members – Grippers
Patent
1992-04-27
1993-08-03
Burr, Edgar S.
Printing
Work supporting members
Grippers
271227, 271277, B41F 2110, B65H 508
Patent
active
052319270
ABSTRACT:
An electric or electronic sheet control device is provided at a sheet-transferring cylinder of a printing machine. According to the state of the art, in order to detect a leading edge of a sheet, two detecting elements respectively detect the presence of a sheet and a misaligned sheet. According to the invention, two detecting elements are disposed in such a way that they detect at least the outer areas of a leading edge of a sheet and at least one further detecting element is provided between the two detecting elements, which makes it possible to detect whether or not the leading edge of the sheet is straight.
REFERENCES:
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patent: 3926118 (1975-12-01), Preuss
patent: 3948170 (1976-04-01), Ericsson
patent: 4127265 (1978-11-01), Wirz et al.
patent: 4466350 (1984-08-01), Schilling et al.
patent: 4785733 (1988-11-01), Hartung et al.
patent: 4805893 (1989-02-01), Kusaka
Pfisterer Alexander
Schulz Andreas
Burr Edgar S.
Funk Stephen R.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
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