Patent ID: 7483657

Claim:
An image forming apparatus comprising: an image bearing member on which an electrostatic image is formed on the basis of an image signal; a developing device for developing the electrostatic image formed on said image bearing member with a developer including toner and a carrier; a supplying apparatus for supplying into said developing device a developer including toner on the basis of the image signal by rotating a feeding screw; an inclination detecting device for detecting an inclination of said feeding screw; and a controller for controlling a rotating duration of said feeding screw or a rotational speed of said feeding screw for a predetermined image signal so that rotating duration or the rotating speed increases with an increase of an angle of the inclination of said feeding screw on the basis of a result of a detection result of said inclination detecting device and where the angle is positive in such a direction that a downstream side of said feeding screw with respect to a developer feeding direction moves upward beyond an upstream side of said feeding screw.