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. 18, 1987
Filed:
Feb. 26, 1986
Applicant:
Inventor:
Teruo Fujii, Kyoto, JP;
Assignee:
Dainippon Screen Mfg. Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
355 73 ; 355 76 ;
Abstract
A rotary suction drum provided with a number of pores in the drum surface has its inside space divided into multiple sections by partitions, communicating at least one of the drum sections with a source of suction through a duct, the sections also being in communication with each other through apertures provided in the partitions. Valves are provided at the partition apertures for covering the apertures under centrifugal action when the rotary drum is rotated, the covering valve elements being located adjacent to the respective apertures.