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. 29, 1978
Filed:
Sep. 28, 1976
Yutaka Ebi, Tokyo, JP;
Masatoshi Saitou, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An electrostatic charge is applied to a dielectric peripheral surface of a transfer drum and a copy sheet is fed between the transfer drum and a photoconductive drum to transfer a toner image from the photoconductive drum to the copy sheet. The drums rotate at the same surface speed and in the same direction at adjacent portions thereof. The surface speed is maintained at a first value for a first toner transfer operation and then changed to a second value for a subsequent toner transfer operation. A voltage sensor in combination with a variable voltage source adjusts the value of the electrostatic charge on the transfer drum to a predetermined value at either surface speed.