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:
Mar. 27, 1990
Filed:
Jan. 27, 1989
Riso Kagaku Corporation, , JP;
Abstract
In a rotary stencil printer having a printing drum supported to be rotatable about a central axis thereof and having a cylindrical outer surface adapted to bear a perforated stencil sheet as attached therearound and formed with openings for supplying ink to an inside surface of the perforated stencil sheet, and a back press roller supported to be rotatable about a central axis thereof extending in parallel with the central axis of the printing drum and having a cylindrical outer surface which defines a nip area with the cylindrical outer surface of the printing drum therebetween for nipping and transferring a printing sheet therethrough. The printing drum has an outer peripheral wall portion substantially made of only a net material constructed by weaving or knitting filaments to provide the cylindrical outer surface thereof formed with the openings, and an internal press roller is provided so as to engage the outer peripheral wall portion at a radially inside surface thereof and to press the outer peripheral wall portion radially outwardly toward the back press roller, thereby locally elastically deforming the net material to traverse a nip area clearance when a printing sheet is supplied in the nip area.