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:
Jul. 21, 1998
Filed:
May. 31, 1996
Yoshihiro Tamura, Tokyo, JP;
Hidetoshi Hara, Otsu, JP;
Yuichi Nakao, Otsu, JP;
Kazuo Ishiwari, Ichikawa, JP;
Toray Industries Inc., Tokyo, JP;
Abstract
An electrophotographic printer includes: a photosensitive drum; a latent image forming portion for forming electrostatic latent images on the photosensitive drum based on print information; a developing portion for developing the electrostatic latent images using toner; an intermediate transfer drum for receiving the toner images from the photosensitive drum; a transportation portion for delivering a recording medium; and a transfer roll for transferring the toner image from the intermediate transfer roll to the recording medium. A pressure force P.sub.1 between the photosensitive drum and the intermediate transfer drum is less than a pressure force P.sub.2 between the transfer roll and the intermediate transfer drum. P.sub.1 and P.sub.2 may also have the relationship P.sub.1 .gtoreq.P.sub.2 sin.theta., where .theta. is an angle formed between a line through the centers of rotation of the intermediate transfer drum and the transfer roll, and a line perpendicular to a line through the centers of rotation of the photosensitive drum and the intermediate transfer drum. The transfer roll may be separated from the intermediate transfer drum when the image is transferred from the photosensitive drum to the intermediate transfer drum.