Paperboard processing machine with vacuum transfer system

Sheet feeding or delivering – Feeding – By means to convey sheet

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Details

271197, 1986891, B65H 502

Patent

active

055646930

ABSTRACT:
A paperboard processing machine is disclosed for printing and otherwise processing sheets of paperboard, such as corrugated container blanks, and in which the sheets are conveyed from one section of the machine to another section by one or more vacuum transfer systems. Each vacuum transfer system comprises an enclosure which is closed by a closure plate for creating a subatmospheric pressure, which pressure forces the sheets into frictional engagement with the reaches of a plurality of conveyor belts whereby the sheets are transported without contact of the opposite side of the sheet not contacted by the conveyor reach. In one embodiment the closure plate is imperforate, while in the second embodiment the closure plate is provided with a limited number of apertures for providing a secondary flow of air upwardly against the bottom surfaces of the paperboard sheets. In addition, in one preferred embodiment, a plurality of slots are provided in the closure plate for reducing the inflow of air at the entrance and exit ends of the transfer section.

REFERENCES:
patent: 1669066 (1928-05-01), Murck
patent: 2384155 (1945-09-01), Brunk
patent: 4526360 (1985-07-01), Focke
patent: 4745432 (1988-05-01), Langdon
patent: 5004221 (1991-04-01), Stark
patent: 5163891 (1992-11-01), Goldsborough et al.
patent: 5383392 (1995-01-01), Kowalewski et al.
patent: 5467180 (1995-11-01), Malachowski et al.

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