Patent ID: 9031430
Filing Date: 2015-05-12
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member; an image forming unit configured to form a toner image on said image bearing member; a first cleaning blade configured to abut and clean said image bearing member; a transfer belt configured to carry a recording material; a second cleaning blade configured to abut and clean said transfer belt; a transfer member configured to transfer the toner image from said image bearing member onto the recording material carried on said transfer belt at a transfer portion; a detection toner image forming portion configured to be able to form a detection toner image on said image bearing member in an interval between images to be formed on a recording material and a subsequent recording material by said image forming unit, when a job for continuously forming the toner image on the recording material is executed; a detecting member configured to detect the detection toner image; an adjusting portion configured to adjust a condition of said image forming unit depending on an output of said detecting member; a power source configured to apply a voltage to said transfer member to generate, between said image bearing member and said transfer belt, a first electric field for supplying the detection toner image as a first supply toner pattern to said first cleaning blade and a second electric field for supplying the detection toner image as a second supply toner pattern to said second cleaning blade; an electric field switching portion configured to switch the first electric field and the second electric field from one to the other; and a control portion configured to control said electric field switching portion in the job so that a ratio of a number of second supply toner patterns to a predetermined number of intervals between images is larger than a ratio of a number of first supply toner patterns to the predetermined number of intervals between images.