Sheet feeding or delivering – Feeding – Separators
Patent
1985-09-03
1986-11-25
Reger, Duane A.
Sheet feeding or delivering
Feeding
Separators
101231, 271 11, 271 97, 271153, B65H 308
Patent
active
046244549
ABSTRACT:
A sheet feeder of a printing machine has sheet separating and conveying facilities and a stack table which raises a stack of sheets by means of a controlled lift drive so that a respective uppermost sheet of the stack is in an operating position for the sheet separating and conveying facilities, the sheet separating facility including separating suckers for raising, in timed sequence, a respective trailing sheet end, as viewed in sheet conveying direction through the feeder, a suction line connecting the separating suckers to a suction source, a pressure measuring device connected in the suction line for determining an actual instant of time at which a respective sheet is sucked up by the separating suckers, a comparator device for comparing the actual suction instant of time with a nominal suction instant of time generated in synchronism with rotation of the printing machine to determine a difference value, a comparator device for comparing the difference value with a value corresponding to an optimum height of the stack of sheets, and a lift drive for raising the stack of sheets to compensate for a given deviation of the difference value from the optimum height value.
REFERENCES:
patent: 3149833 (1964-09-01), Rolon
patent: 3378253 (1968-04-01), Jong-Dok-Kim
patent: 4480826 (1984-11-01), Kaneko
Grutzmacher Bertold
Krestyn Karl-Heinz
Carroll John A.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
Reger Duane A.
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