Toner collection device collecting floating toner and image forming apparatus including toner collecting device

A toner collecting device comprising:

• an exhaust path through which air containing a floating toner is passed;
• a catching installation configured to catch the floating toner from the air passing through the exhaust path;
• a floating toner collection chamber in which the floating toner caught by the catching installation is stored;
• an intermediate collection box in which the floating toner collection chamber is provided, the intermediate collection box storing a toner removed from an image carrier by a cleaning device;
• a waste toner collection container in which the toner stored in the intermediate collection box is collected;
• and
• a conveying screw supported on a conveying path provided in the intermediate collection box in a rotatable manner in a normal direction and in a reverse direction, the conveying screw conveying the stored toner toward the waste toner collection container by rotating in the normal direction;
• wherein the floating toner collection chamber includes:
• a discharge opening opened to an inside of the intermediate collection box;
• and
• a discharge door which is interfered with the conveying screw as the conveying screw is rotated, and is turned between a storage position where the discharge opening is closed and a discharge position where the discharge opening is opened,
• wherein rotation of the conveying screw in the normal direction turns the discharge door into the storage position,
• rotation of the conveying screw in the reverse direction turns the discharge door into the discharge position so that the floating toner stored in the floating toner collection chamber is discharged into the conveying path through the discharge opening,
• wherein the catching installation is formed by overlapping a plurality of filters each having a different mesh size,
• the plurality of filters are overlapped in order decreasing the mesh size from an upstream side to a downstream side in an exhaust direction of the exhaust path, and
• the filter having a largest mesh size in the plurality of filters is formed into a pleated shape formed by folding a rectangular plane shaped filter alternately at mountain folding lines and river folding lines.