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:
Oct. 11, 1994
Filed:
Apr. 02, 1992
Luis Lima-Marques, Darlington, AU;
MAN Roland Druckmaschinen AG, Offenbach am Main, DE;
Abstract
To permit transfer of toner particles forming an image from a ferroelectric surface (2) onto a substrate (6), without careful operating constraints, an intermediate or offset cylinder (4, 11) is placed opposite the ferroelectric surface (2) to define a small gap (16) therewith, in the order of between about 0.05 to 0.15 mm. The surface on the offset member, preferably a cylinder, can be either semiconductive or insulating material (5), typically very smooth polyurethane, or a conductive sleeve (14) over an insulating core. The substrate (6) is engaged against the offset cylinder (4, 11) by an impression or counter or transfer roller (7) which is subjected to a high direct current voltage, for example between about 1 kV to 4 kV. Corona elements (24, 23) can be located close to the ferroelectric surface and to the offset cylinder surface, the electrode being energized with reverse polarity to assist in a transfer of toner particles to the intermediate or offset cylinder (4, 11).