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:
Dec. 02, 1986
Filed:
May. 20, 1985
Applicant:
Inventor:
Andres Peekna, Hinsdale, IL (US);
Assignee:
R. R. Donnelley & Sons Company, Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41F / ; B41F / ; B65H / ; H01F / ;
U.S. Cl.
CPC ...
242-702 ; 2914 / ; 1013 / ; 1014151 ; 335288 ;
Abstract
A magnetic cylinder and plate for offset printing. The cylinder has annular magnets and pole pieces. The magnetic circuit is completed through a printing plate. The magnetic flux substantially saturates the pole pieces and plates. The area ratio of the pole pieces to the magnets is greater than about 0.45 to 1 and preferably about 0.6 to 1. In assembling the magnets and cylinder, the magnets are wrapped into slots between the pole pieces. The magnets are angularly displaced so that the leading magnet is positioned between the pole pieces before it is in proximity to the trailing magnet and demagnetization of the magnets is minimized.