Patent ID: 7257355

Claim:
A image forming device comprising: a toner container being configured to contain toner; an image bearing member having a surface being configured to have an electrostatic image formed thereon; a developing device having a plurality of developing units being located corresponding to different developing colors, and a rotary frame maintaining the developing units in a circumferential direction in order to place each of the developing units opposite the image bearing member via rotation; and a toner supply device being configured to supply toner contained in the toner container to the developing device, the toner supply device having a conveyance pipe being connected to the toner container, the conveyance pipe conveying the toner from the toner container to the developing device, at least one supply pipe being configured to supply the toner from the conveyance pipe downward to the developing device, the at least one supply pipe having an upper portion connected to the conveyance pipe and a lower end configured to advance into the developing device, the at least one supply pipe having a center axis of the supply pipe slanted relative to the horizontal line at a repose angle of the toner or more, the supply pipes being located to correspond to the developing units, and a conveyance member being rotatably located in the supply pipe, the conveyance member conveying the toner downward.