Image forming apparatus

摘要

An image forming apparatus includes a controller and multiple image forming units each of which includes an image bearer, a toner image forming device to form a toner image on the image bearer, a transfer device to transfer the toner image from the image bearer onto a transfer medium, a cleaning device to remove toner from a surface of the image bearer, a waste-toner tube through which toner removed by the cleaning device is transported, and a toner conveying member to transport toner by rotation and disposed inside the waste-toner tube. The controller changes a rotation speed of the toner conveying member for each of the multiple image forming units according to toner type including a first toner and a second toner having poorer flow properties than the first toner, and at least one image forming units uses the second toner and the rest use the first toner.

主权项

1. An image forming apparatus comprising:
multiple image forming units each of which includes:
an image bearer;a toner image forming device to form a toner image on the image bearer;a transfer device to transfer the toner image from the image bearer onto a transfer medium;a cleaning device to remove toner from a surface of the image bearer from which the toner image is transferred;a waste-toner tube through which toner removed by the cleaning device is transported;a toner conveyor to transport toner by rotation, the toner conveyor disposed inside the waste-toner tube; and a controller to change a rotation speed of the toner conveyor for each of the multiple image forming units according to toner type including a first toner and a second toner having poorer flow properties than the first toner, wherein at least one of the multiple image forming units uses the second toner and the remaining image forming units use the first toner.