Patent ID: 8107832
Filing Date: 2012-01-31
Classification: G03G

Abstract:
1. An image forming apparatus, comprising; an endless loop belt configured to rotate; an image forming section including a color image forming unit and a monochrome image forming unit, the color image forming unit having a first image carrier and a developing section for forming a color image on the surface of the first image carrier, the monochrome image forming unit having a second image carrier and a developing section for forming a monochrome image on the surface of the second image carrier; a displacement operation section arranged to conduct a press-contact operation and a release operation, the press-contact operation causes the first image carrier to make contact with the belt, and the release operation causes the first image carrier to separate from the belt; a cumulative value obtainment section configured to obtain the cumulative number of color images and the cumulative number of monochrome images; a comparison section configured to compare the cumulative number of color images and the cumulative number of monochrome images; and a displacement control section configured to control the displacement operation section to perform the press-contact operation when the cumulative number of color images is greater than the cumulative number of monochrome images after the image forming section forms a series of images, and to perform the release operation when the cumulative number of color images is less than the cumulative number of monochrome images after the image forming section forms a series of images.