Man Roland Druckmaschinen Ag

Harry Brandes

Paul Abendroth

Rudolf Raab

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.

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Obertshausen, Germany

Harry Brandes