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:
Feb. 15, 1994
Filed:
Oct. 29, 1992
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A superposed image forming apparatus wherein toner images are superposedly transferred onto a transfer material includes an image bearing member; a device for forming a toner image on the image bearing member; a transfer material carrying member, disposed opposed to the image bearing member, for carrying a transfer material in synchronism with the toner image on the image bearing member; a transfer material supplying device for supplying the transfer material to the transfer material carrying member; a transfer bias voltage source for applying to the transfer material carrying member a bias voltage for image transfer from the image bearing member to the transfer material; an attraction member for urging the transfer material to the transfer material carrying member to hold the transfer material on the transfer material carrying member; an attraction bias voltage source for applying a bias voltage to the attraction member; the bias voltage applied to the attraction member is changed in association with on-and-off of the bias voltage application to the transfer material carrying member so as to maintain a constant surface potential of the transfer material carrying member.