Image forming apparatus with natural ventilator

1. An image forming apparatus comprising:

a body plate;

a cover disposed opposite the body plate;

an orthogonal plate projecting from a lower edge of the cover orthogonally toward the body plate;

an outside air inlet created between the orthogonal plate and the body plate, through which outside air is taken in, the outside air inlet being disposed in a plane extending along a surface of the orthogonal plate while the cover is closed;

a vent created between the body plate and the cover at an upper edge of the cover;

an air current channel in communication with the outside air inlet and the vent, the air current channel through which the outside air taken in through the outside air inlet travels upward to the vent in an outside air traveling direction; and

at least one hot air outlet produced through the body plate at a position between the outside air inlet and the vent in the outside air traveling direction, the at least one hot air outlet through which hot air is discharged into the air current channel;

a plurality of primary ribs mounted on an interior face of the cover disposed opposite the body plate and having a first length extending in the outside air traveling direction;

a plurality of secondary ribs mounted on an exterior face of the body plate and having a second length extending in the outside air traveling direction smaller than the first length of the plurality of primary ribs,

wherein the at least one hot air outlet includes a plurality of hot air outlets aligned in parallel to each other and each of the plurality of secondary ribs is disposed at a gap between adjacent hot air outlets,

wherein each of the plurality of secondary ribs is interposed between the adjacent primary ribs in a direction orthogonal to the outside air traveling direction, and

wherein the outside air taken in through the outside air inlet is mixed with the hot air discharged through the at least one hot air outlet and is exhausted through the vent.

2. The image forming apparatus according to claim 1 , wherein the plurality of primary ribs is aligned in parallel to each other with a first interval between adjacent primary ribs in a direction orthogonal to the outside air traveling direction, the first interval through which the outside air travels upward in the outside air traveling direction from the outside air inlet to the vent.

3. The image forming apparatus according to claim 1 , wherein each of the plurality of primary ribs is disposed opposite a gap between adjacent hot air outlets in a direction orthogonal to the outside air traveling direction.

4. The image forming apparatus according to claim 1 , wherein the second length of the plurality of secondary ribs corresponds to a third length of the plurality of hot air outlets in the outside air traveling direction.

5. The image forming apparatus according to claim 1 , wherein a set second interval is provided between the body plate and the plurality of primary ribs and secondary ribs mounted on the cover in the direction orthogonal to the outside air traveling direction.

6. The image forming apparatus according to claim 1 , further comprising:

a recording medium outlet disposed upstream from the at least one hot air outlet in the outside air traveling direction, the recording medium outlet through which a recording medium bearing a toner image is discharged; and

a shaft attached to a lower end of the cover disposed upstream from the recording medium outlet in the outside air traveling direction, the shaft pivotably supporting the cover,

wherein the cover pivots about the shaft and is opened to receive the recording medium discharged through the recording medium outlet.