Sheet guidance arrangement in printing-machine outfeed units

Details Sheet guidance arrangement in printing-machine outfeed units Sheet guidance arrangement in printing-machine outfeed units

1979-01-26

1980-09-30

Reeves, Robert B.

Sheet feeding or delivering

Delivering

By endless conveyor

271183, 271231, B65H 2904, B65H 2936

Patent

active

042251290

ABSTRACT:
Grippers pull the leading ends of sheets along a sheet transport path, and a guidance structure facilitates sheet travel. The guidance structure comprises a plurality of longitudinally extending guide bars provided with suction openings, the ribs spaced apart transverse to the sheet-transport direction. Intermediate the bars are large-surface-area plates having suction openings. When guiding sheets printed on only one side, the intermediate suction plates are at about the same level as the longitudinally extending guide bars, and the entire face of the sheet is engaged, with the help of suction force. When guiding sheets printed on both sides, the imtermediate suction plates all drop down out of contact with the sheet, leaving only the spaced apart and narrow longitudinal guide bars to engage the sheet. The guide bars are furthermore transversely shiftable, so that they can be brought into engagement with parts of the sheets bearing no printing.

REFERENCES:
patent: 3378256 (1968-04-01), Ellis et al.
patent: 3595564 (1971-07-01), De Young
patent: 3779545 (1973-12-01), Schuhmann et al.
patent: 4013284 (1977-03-01), Demetre
patent: 4148476 (1979-04-01), Brekell

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