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. 21, 2003
Filed:
Oct. 16, 2001
Yuma Yoshida, Kasugai, JP;
Yoshihiro Wago, Kani, JP;
Yasuhiro Iwamoto, Toyohashi, JP;
Hideki Sendo, Toyokawa, JP;
Tokai Rubber Industries, Ltd., Komaki, JP;
Abstract
A retard roller of non-ground surface type which is virtually free from adhesion of paper dust thereby to have an excellent friction coefficient sustain ability, and which is free from creaky noises at a relatively low sheet feeding speed; a retard roller of non-ground surface type having little variation in outer diameter; and a sheet feeder employing such a retard roller. The retard roller comprises a roller body and a shaft extending axially therethrough, the roller body having a textured roller surface comprising a multiplicity of island portions ( ) and a sea portion ( ) recessed from the island portions, the island portions and the sea portion each having a multiplicity of fine projections ( ). The ratio S /S of the total area S of the island portions to the area S of the sea portion preferably is 0.25 to 0.55. The fine projections preferably each have a height of 3 to 25 &mgr;m.