Patent ID: 8879937
Filing Date: 2014-11-04
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a movable image bearing member; a toner image forming unit which forms a toner image and a plurality of adjustment toner images on the image bearing member; a transfer member which constitutes a transfer portion where a transfer electric field is formed, that enables transferring the toner image on the image bearing member onto a recording material, the transfer member transferring the toner image in an image area onto the recording material, wherein the adjustment toner images are transferred onto the transfer member; a detection member which detects the adjustment toner images, which are formed in an outside area, which is located outside of the image area of the image bearing member in a direction orthogonal to a moving direction of the image bearing member; an adjustment portion which adjusts toner image forming conditions of the toner image forming unit in accordance with an output from the detection member; a cleaning member which comes into contact with the transfer member at a cleaning portion and electrostatically cleans off toner adhering to the transfer member by application of a cleaning electric field that allows the toner having a normal charging polarity to move toward the cleaning member; and a control portion which sets the cleaning electric field so that the cleaning electric field when the transfer electric field is a first transfer electric field is smaller than the cleaning electric field when the transfer electric field is a second transfer electric field smaller than the first transfer electric field.