Patent ID: 8521043

Claim:
An image forming apparatus configured to form an image on a recording sheet by transferring toner onto the recording sheet, the image forming apparatus comprising: a first roller; a second roller spaced apart from the first roller; a belt looped around the first roller and the second roller, the belt extending in an extending direction between the first roller and the second roller, the belt being configured to rotate; a container having an inlet configured to receive waste toner from a surface of the belt, the container including a bottom peripheral surface on which the waste toner is to be accumulated and a top peripheral surface opposite the bottom peripheral surface, the container defining a storage area having a horizontal dimension greater than a vertical dimension; a first pump disposed below the belt and adjacent to the inlet of the container on an inlet side, and being configured to feed the waste toner from the inlet to an outlet side of the first pump, the first pump comprising a first elliptical rotor having an elliptical-shaped cross section, and being configured to rotate on a shaft disposed perpendicular to the cross section; a second pump disposed below the belt and on the outlet side of the first pump, and being configured to feed the waste toner fed by the first pump to an outlet side of the second pump on a side opposite the inlet in the storage area, the second pump comprising a second elliptical rotor having an elliptical-shaped cross section, and being configured to rotate on a shaft disposed perpendicular to the cross section, the second elliptical rotor being spaced apart from the first elliptical rotor in the extending direction; and a cleaning roller disposed between the belt and the first pump, and being configured to supply the waste toner from the surface of the belt to an inlet side of the first pump opposite the outlet side of the first pump, wherein the container includes a lower wall extending from the bottom peripheral surface of the container toward the belt such that a line connecting axes of the first elliptical rotor and the second elliptical rotor intersects the lower wall, and the lower wall is disposed in the storage area between the outlet side of the first pump and the second pump.