Air cushion drum or sheet-fed printing presses

Details Air cushion drum or sheet-fed printing presses Air cushion drum or sheet-fed printing presses

1989-08-09

1991-04-16

Burr, Edgar S.

Printing

Antismut device

Contact preventers

1014161, B41F 1308

Patent

active

050073427

ABSTRACT:
An air cushion drum for a sheet-fed printing press is formed with an internal body and an outer casing defining a cavity inside the drum through which air streams are supplied to issue from orifices in the drum casing and force the sheets away therefrom. To reduce airflow noise a sound-absorbent layer which has radial ducts is disposed in the cavity and forms therein an air-permeable partition which is equidistant from the drum casing. In the preferred embodiment, the sound-absorbent layer is supported by a lattice formed with droplet shaped members which further reduce air flow resistance and the sound-absorbent layer which may be formed of felt or foam is supported on the lattice by an outer stabilizing layer of plastic material.

REFERENCES:
patent: 3542358 (1970-11-01), Schuhmann
patent: 4297794 (1981-11-01), Luthi
patent: 4506841 (1985-04-01), Hood
patent: 4552069 (1985-11-01), Jahn
patent: 4688784 (1987-08-01), Wirz
patent: 4824002 (1989-04-01), Ford et al.
patent: 4843731 (1989-07-01), Vits
patent: 4919319 (1990-04-01), Ford et al.

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