Image forming apparatus having a plurality of image forming modes

Patent metadata

Field	Value
Publication number	US-8942580-B2
Application number	US-201213494292-A
Country	US
Kind code	B2
Filing date	Jun 12, 2012
Priority date	Jun 15, 2011
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

An image forming apparatus includes an intermediary transfer member, image forming portions each including an image bearing member first transfer portions, cleaning portions, and a controller capable of executing a single-color image forming mode operation in which a developer image of a single color is transferred onto the intermediary transfer member by an image forming operation of one of the image forming portions to form a single-color image. The controller executes, during the execution of the single-color image forming mode operation, a sequence in which the developer image is formed on the image bearing member at the image forming portion which does not operate for the image formation, and a bias voltage for charging the developer to an opposite polarity to a normal charge polarity of the developer is applied to the first transfer portion to permit the charged developer to reach the cleaning portion.

First claim

What is claimed is:

1. An image forming apparatus for forming an image on a recording material, comprising:
an intermediary transfer member onto which a plurality of developer images are to be transferred;
a plurality of image forming portions provided along a movement direction of said intermediary transfer member, wherein each of said image forming portions includes a rotatable image bearing member, a rotatable charging roller, for electrically charging uniformly a surface of…

Assignees

• Yoshida Masahiro
• Canon Kk

Inventors

• Yoshida Masahiro

Classifications

• G03G15/50

  Physics · mapped topic

• G03G15/0131 Primary

  Physics · mapped topic

• G03G15/0266

  Physics · mapped topic