Image forming apparatus including a toner conveyance portion with vent holes having filters disposed thereon

An image forming apparatus comprising:

• a toner conveyance portion forming a toner conveyance passage between at least one developing device and a collection container such that toner discharged from the developing device is conveyed in the toner conveyance passage and collected in the collection container;
• at least one vent hole portion formed in the toner conveyance portion and allowing inside and outside of the toner conveyance portion to communicate with each other such that air can be ventilated between the inside and the outside of the toner conveyance portion;
• an air suction portion configured to suck the air inside the toner conveyance portion via the vent hole portion;
• a filter portion disposed on the vent hole portion and configured to trap toner contained in the air sucked by the air suction portion;
• and
• a toner removing portion configured to remove, from the filter portion, the toner that has been trapped by the filter portion, wherein
• the toner removing portion includes a shaft portion and a paddle portion, the shaft portion being disposed inside the toner conveyance portion, the paddle portion extending from the shaft portion and configured to contact the filter portion with a rotation of the shaft portion around an axis thereof.