POWDER CONVEYING DEVICE AND IMAGE FORMING APPARATUS

To reduce the likelihood of the occurrence of clogging with powder.SOLUTION: A powder conveying device for conveying toner (powder) from a toner storage container 32Y (supply body) toward a developing device 5Y (supply target body), is provided with: a first conveyance path 91 that is provided therein a first conveying screw 71 (first conveying member) conveying the toner; a fall path 93 through which the toner discharged from an outflow port 91b of the first conveyance path 91 falls; and a second conveyance path 92 that is provided therein a second conveying screw 72 (second conveying member) into which the toner falling through the fall path 93 flows from an inflow port 92a and conveying the toner. A "high-duty mode (control mode)" is executed which is for increasing an amount of powder conveyed per unit time by at least one of the first conveying screw 71 and the second conveying screw 72, from when a new toner storage container 32Y is initially started to be used until when a predetermined powder conveyance time T elapses, compared to an amount after the lapse of the powder conveyance time T.SELECTED DRAWING: Figure 8 【課題】粉体の詰まりを生じにくくする。【解決手段】トナー収納容器３２Ｙ（供給体）から現像装置５Ｙ（被供給体）に向けてトナー（粉体）を搬送する粉体搬送装置であって、トナーを搬送する第１搬送スクリュ７１（第１搬送部材）が内設された第１搬送経路９１と、第１搬送経路９１の流出口９１ｂから流出されたトナーが落下する落下経路９３と、落下経路９３で落下したトナーが流入口９２ａから流入されて、トナーを搬送する第２搬送スクリュ７２（第２搬送部材）が内設された第２搬送経路９２と、が設けられている。そして、新品状態のトナー収納容器３２Ｙが初めて使用開始されてから所定の粉体搬送時間Ｔが経過するまで、その粉体搬送時間Ｔの経過後に比べて、第１搬送スクリュ７１と第２搬送スクリュ７２とのうち少なくとも一方による単位時間当たりの粉体搬送量を高める「高デューティモード（制御モード）」が実行される。【選択図】図８