Patent · US Expired

Air cushion drum or sheet-fed printing presses

US5007342A · kind A · utility

3Cited by

8References

9Claims

0Family size

Assignee

MAN Roland Druckmaschinen AG · DE

Inventors

Paul Abendroth · Offenbach am Main, DE
Harry Brandes · Großkrotzenburg, DE
Rudolf Raab · Hanau, DE

Key dates

Filing date	Aug 9, 1989
Grant date	Apr 16, 1991
Priority date	—
Expiry date	Aug 9, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB65H5/228
WIPO fieldHandling
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.