The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 1991
Filed:
Aug. 09, 1989
MAN Roland Druckmaschinen AG, , DE;
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.