Sheet feeding or delivering – Feeding – With means to align sheet
Patent
1989-03-27
1995-11-07
Graham, Matthew C.
Sheet feeding or delivering
Feeding
With means to align sheet
271228, 271239, B65H 702
Patent
active
054642060
ABSTRACT:
A feeder for a sheet-fed printing machine having a feeder table having at least one pulling unit coupled to the machine drive train for imparting to each newly arrived sheet a defined direction of pull, and a sensing arrangement for sensing the position of the side edges of the sheet, the feeder which includes at least one sensor having a response range, facing a respective side edge of the sheet, the sensor which produces two distinctly different signals that indicate the presence or absence, respectively, of the sheet in the desired position of the sheet before and after imparting the pull; electronic logic control apparatus operatively responsive to the signals from the sensor that are produced at the first and second interrogation of the sensor before and after the pull for determining if the sheet after the pull is positioned within the response range of the sensor; and alarm indicator operatively responsive to the logic control apparatus for producing an alarm indication in case it is determined by the logic control apparatus, that the respective sheet edge is not present within the response range of the sensor after the second interrogation.
REFERENCES:
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patent: 3227443 (1966-01-01), Pasquinelli
patent: 4017066 (1977-04-01), Lasher et al.
patent: 4058359 (1977-11-01), Urselmann
patent: 4060237 (1977-11-01), Degen et al.
patent: 4310236 (1982-01-01), Connin
patent: 4410171 (1983-10-01), Kobayashi
patent: 4478405 (1984-10-01), Eertink et al.
patent: 4483530 (1984-11-01), Spencer et al.
Krestyn Karlheinz
Rodi Anton
Uhrig Dieter
Graham Matthew C.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
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