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:
Sep. 18, 1990
Filed:
Feb. 09, 1988
Hiroaki Tsuchiya, Kanagawa, JP;
Kimio Nakahata, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a duplex image forming apparatus, first and second image forming devices are arranged respectively in upstream and downstream sides of a moving direction of a transfer member. Each image forming device includes an image bearing member, a developer for forming on the image bearing member a toner image corresponding to first and second information signals, respectively, and a transfer device for transferring the respective toner images to respective sides of the transfer member. A reader is provided for reading a first side of an original and, at a point of time after reading of the first side begins, a second side of the original. The length of time required to move the transfer member from the first transfer station to the second transfer station is equal to the length of time between beginning to read the first side of the original and beginning to read the second side of the original. Advantageously, the electric polarity used to transfer the first toner image to the first side of the transfer member is opposite to that required to transfer the second toner image to the second side of the transfer member.