| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus where toner conveying force of each pump vacuuming a toner inside a toner container with air and feeding the toner to a sub hopper is kept uniform in a simple manner at low cost.SOLUTION: An image forming apparatus comprises: at least one developing device 9 that forms a toner image by developing an electrostatic latent image formed on an image carrier 1; at least one sub hopper 20 that is arranged above the developing device, temporarily pools a toner of each color, and supplies the toner to the developing device; at least one toner container 60 that accommodates the toner of each color; at least one air pump 30 that is arranged above the sub hopper, vacuums the toner inside the toner container with air, and feeds the toner to the sub hopper; and a flexible tube 53 that at least constitutes a part of a toner conveyance path connecting the air pump and the toner container. The tube has a different inner diameter according to length of the tube. |
