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:
Dec. 05, 2000
Filed:
Nov. 19, 1997
Toru Katsumi, Mishima, JP;
Takao Honda, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is related to an image forming apparatus for forming a two-color toner image on a photosensitive body and transferring a batch of the image to a transfer material. The apparatus has a rotating and moving electrophotographic photosensitive body. Successively along a rotating direction of the photosensitive body arranged are a first developing device using a two-component developing agent constituted of a magnetic carrier and a nonmagnetic toner and a second developing device using a one-component magnetic developing agent different in color from the nonmagnetic toner. The apparatus also has a control circuit for stopping an image forming operation when a trouble occurs in an apparatus body. To prevent the carrier of the first developing device from mixing in the second developing device, a drive mechanism is provided for detaching a magnet of the second developing device from the photosensitive body to a position at which the carrier adhering from the first developing device to the photosensitive body does not mix in the second developing device by means of a magnetic force of the second developing device when the image forming operation is stopped.