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. 15, 1991
Filed:
Jan. 03, 1990
Yuji Sawai, Yokohama, JP;
Toshio Nakahara, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A method of cleaning a transfer drum, which is located to face a photoconductive drum, to remove a toner left untransferred on a transfer film which is wound around the transfer drum. A fur brush rotatable in contact with the transfer drum for removing the toner from the drum and a toner collecting roller rotatable in contact with the fur brush for removing the toner from the brush are prepared. Before the fur brush begins cleaning the transfer film, the toner collecting roller collects the toner deposited on the fur brush. The fur brush is prevented from rubbing itself against a clamping section which is provided on the transfer drum for retaining a paper sheet. The transfer film is discharged while being cleaned. Before the transfer drum is cleaned, the photoconductive drum is cleaned twice or more.