Device for scanning the length of a sheet in a sheet processing

Details Device for scanning the length of a sheet in a sheet processing Device for scanning the length of a sheet in a sheet processing

1990-03-05

1992-02-18

Olszewski, Robert P.

Sheet feeding or delivering

Feeding

Separators

271108, 271260, 271261, B65H 508

Patent

active

050887165

ABSTRACT:
Device for scanning lengths of sheets in a sheet-processing machine, wherein the sheets travel with a leading and a trailing edge, including suction-air measuring nozzles alignable with the trailing edges of the sheets and connected to a suction-air source via control elements connected in an electrical circuit of the machine drive, a feeder for aligning the sheets to be processed at stops for the leading edges of the sheets, lift-type suckers for lifting the sheets individually off a pile of sheets, and have structure defining a scanning hole in at least one of the suction-air measuring nozzles, the one nozzle being disposed in the feeder and being directed towards the trailing edge of an uppermost sheet disposed on a pile of sheets, a suction-air connecting line connecting the one nozzle to the suction-air source, and a differential pressure-measuring valve connected in the line and cooperatively associated with the control elements.

REFERENCES:
patent: 3617048 (1971-11-01), Albert
patent: 3627311 (1971-12-01), Spinelli
patent: 3966197 (1976-06-01), Riedl et al.
patent: 4090702 (1978-05-01), Wirz
patent: 4127265 (1978-11-01), Wirz et al.
patent: 4184674 (1980-01-01), Wirz et al.
patent: 4236710 (1980-12-01), Nakanura et al.
patent: 4391939 (1983-07-01), Estrom
patent: 4869989 (1989-09-01), Wirz et al.

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