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:
Aug. 03, 1993
Filed:
Feb. 26, 1992
Joachim Mittmeyer, Neuried, DE;
Waldemar Urschel, Maisach, DE;
Johann Baarfusser, Gauting, DE;
Lothar Langer, Munich, DE;
Rainer Rohling, Radevormwald, DE;
BASF Magnetics GmbH, , DE;
Abstract
A suction roller arrangement for transporting web-form material consisting of a roller body in the form of a hollow cylinder of porous sintered metal, the inner space beneath the looping angle of the web being under reduced pressure. The problem of converting the torque required to transport the web with minimal reduced pressure while, at the same time, protecting the surface of the web is solved by making the pore diameter in the middle cylindrical zone of the roller larger than in the two peripheral zones and by giving the outer cylinder surface of the roller a smooth surface finish by lathe-turning, grinding and polishing. The stator in the inner space of the rotatable roller is polygonal in shape in the region of the looping angle and has different distances from the rotor.