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:
Sep. 04, 1990
Filed:
May. 20, 1988
John M Gaffney, Kittery Point, ME (US);
Wilfred R Gelinas, Jewett City, CT (US);
Joel C Hern, Dover, NH (US);
Charles L Krouse, Ashaway, RI (US);
Harris Graphics Corporation, Dover, NH (US);
Abstract
An improved printing apparatus and method includes plate and blanket cylinders which are rotated at different surface speeds during printing on material. Since the plate and blanket cylinders are rotated at different surface speeds, the area on a blanket cylinder which engages a given portion of the surface on a plate cylinder is changed on each revolution of the blanket cylinder. Therefore, the area of a blanket cylinder which is engaged by the gap in the plate cylinder changes during a printing operation. In addition, the area where an image is applied to the blanket cylinder is moved relative to the surface of the blanket cylinder is tend to minimize build up of ink on the blanket cylinder during printing. The plate and blanket cylinders are driven at different surface speeds by a drive assembly which includes a harmonic drive unit.