Patent ID: 8903284

Claim:
A developer storage container, comprising: a container main body including a bottom wall extending in one direction and configured to store a developer, a first side wall extending up from a first end edge of the bottom wall, a second side wall extending up from a second end edge of the bottom wall and facing the first side wall and a ceiling wall disposed over the bottom wall and above a tubular portion; the tubular portion projecting from the container main body while being connected to the bottom wall, and including a developer discharge opening; and a rotary member extending from the container main body to the tubular portion and having a function of conveying the developer in the container main body; wherein: the rotary member includes: a rotary shaft extending in an extending direction of the bottom wall and having a circumferential surface, the rotary shaft including a first section located in the container main body and a second section located in the tubular portion; a first conveying member arranged on the circumferential surface of the second section of the rotary shaft and configured to rotate together with the rotary shaft and convey the developer in a first conveying direction from the tubular portion toward the container main body; a second conveying member arranged around the first section and at a side radially outward of the first conveying member and configured to rotate together with the rotary shaft and convey the developer in a second conveying direction from the container main body toward the tubular portion; and a flexible member including a fixed end portion fixed onto the circumferential surface of the rotary shaft near a downstream end of the first section in the second conveying direction, the flexible member extending from the circumferential surface of the first section of the rotary shaft in a direction perpendicular to an axial direction of the rotary shaft and having a free end portion arranged at a side radially outward of the second conveying member, the free end portion of the flexible member passes a position under the ceiling wall and above the tubular portion in the container main body after successively contacting an inner surface of the first side wall and an inner surface of the second side wall when the fixed portion of the flexible member is rotated together with the rotary shaft, and an elastic force of the free end portion of the flexible member being released and acting to flip the developer around the free end portion upwardly when the free end portion moves away from the inner surface of the second side wall.