Patent ID: 8611770

Claim:
An image forming apparatus comprising: a storage container which horizontally stores waste toner received from a storage port; a full detection sensor which detects whether the waste toner has reached a full position in the storage container, the full position being at an end of the storage container at the opposite side from the storage port inside the storage container; a near detection sensor which detects whether the waste toner has reached a nearly full position in the storage container closer to the storage port than the full position; and a conveyance portion which is provided inside the storage container, the conveyance portion including an axial rod, and the conveyance portion rotating about the axial rod, wherein the conveyance portion includes: a first spiral protrusion which conveys the waste toner to the nearly full position; a second spiral protrusion; and a third range which is provided between the first spiral protrusion and the second spiral protrusion and through which the waste toner passes at a speed lower than the conveyance speed of the first spiral protrusion and the second spiral protrusion, the second spiral protrusion conveying the waste toner from the third range to the full position, and wherein the storage container includes a partition portion which is provided between the nearly full position and the full position so as to separate therebetween and which disturbs the movement of the waste toner so as to prevent the waste toner that reaches the nearly full position from directly moving to the full position before the near detection sensor has detected that the waste toner has reached the nearly full position.