IMAGE FORMING APPARATUS

申请公布号：

US2011033212(A1)

申请号：

US20100850221

申请日期：

2010.08.04

申请公布日期：

2011.02.10

申请人：

CANON KABUSHIKI KAISHA

发明人：

SUZUKI MASAHIRO;IIDA KENICHI

分类号：

G03G15/16

主分类号：

G03G15/16

摘要：

An image forming apparatus includes an image bearing member for carrying a toner image; a transfer member forming a nip with the image bearing member to transfer the toner image from the image bearing member onto a transfer material at the nip, wherein the image forming apparatus is operable in a marginless printing mode in which the toner image formed on the image bearing member is larger than a size of the transfer material, and the toner image is transferred as far as edges of the transfer material; and a charging member for effecting electric discharge toward the image bearing member, the charging member being disposed at such a position as is opposed to a side of the transfer material which receives the toner image in an upstream side of the nip with respect to a feeding direction of the transfer material, wherein when the apparatus operates in the marginless printing mode, the charging member effects the electric discharge toward the toner existing in an area of the image bearing member which corresponds to an area which is outside beyond the edge of the transfer material at the nip to electrically charge the toner in the outside area to a polarity opposite a regular polarity.