image forming device

Abstract

Abstract PURPOSE:To prevent transfer memory, defective transfer, and contamination of a transfer member caused by reversal fog by switching a bias voltage impressed in order to transfer a toner image at either forward or backward end of a transfer material. CONSTITUTION:When a toner image reaches a transfer part where the photosensitive body 1 abuts on a transfer roller 2, a transfer material is supplied to the transfer part from a carrying path 4. At the same time, a transfer bias (a first transfer bias) is impressed to the transfer roller 2 by a power supply 2b; and the toner image on the photosensitive body side is transferred onto the transfer material, and then it is carried to a fixing part A. Transfer bias (a second transfer bias) is impressed to both front and trailing area of the transfer material, and the second bias of a paper nonpassing part is switched to the first bias in a paper passing part and the switched one is impressed. The second transfer bias has such a degree that transfer memory does not arise in the paper nonpassing area. Thus, contamination of the transfer member caused by reversal fogging is effectively prevented without generating transfer memory and defective transfer.

Inventors

• 👤 Junji Araya
• 👤 荒矢　順治
• 👤 Toshiharu Nakamura
• 👤 俊治 中村
• 👤 Yoji Tomoyuki
• 👤 洋二 友行
• 👤 Toshio Miyamoto
• 👤 敏男 宮本
• 👤 Koichi Okuda
• 👤 幸一 奥田
• 👤 Yukihiro Ozeki
• 👤 大関　行弘
• 👤 Masanobu Saito
• 👤 雅信 斉藤

Bibliographic Details