Waste developer collecting device and image forming apparatus

1. A waste developer collecting device comprising:

a collecting container that collects a waste developer discharged from image forming unit including a developing unit for developing an electrostatic latent image with a developer;

a collecting opening that is disposed on an inner wall surface of the collecting container, and collects the waste developer and air discharged from the developing unit;

a conveying unit that is disposed in the collecting container, rotates about a shaft, and conveys the waste developer entering through the collecting opening in the collecting container;

a filter that passes the air collected in the collecting container through the collecting opening, and blocks the waste developer;

a partition wall that partitions an inside of the collecting container into the filter and a containing area for containing the waste developer; and

an air inlet that is formed in an end portion of the partition wall on an upstream side in a conveying direction of the waste developer conveyed by the conveying unit, and that sends the air entering into the collecting container to the filter along the partition wall.

2. The waste developer collecting device as claimed in claim 1 ,

wherein

the air inlet includes an aperture having a sectional area being larger than a sectional area of an aperture of the collecting opening.

3. The waste developer collecting device as claimed in claim 1 ,

wherein

the filter has an area being larger than a sectional area of an aperture of the air inlet.

4. The waste developer collecting device as claimed in claim 1 ,

wherein

the air inlet is formed at a position being different from a position corresponding to the collecting opening and the conveying unit.

5. The waste developer collecting device as claimed in claim 1 ,

wherein

the collecting container includes a holding plate provided therein,

the holding plate guides the conveying unit, and guides into the air inlet the air entering into the collecting container through the collecting opening.

6. The waste developer collecting device as claimed in claim 1 ,

wherein

the air inlet is formed in the vicinity of the collecting opening.

7. The waste developer collecting device as claimed in claim 1 ,

wherein

the partition wall is inclined so as to prevent obstructing a flow of the waste developer at the time when the waste developer is collected in a collecting area inside the collecting container.

8. The waste developer collecting device as claimed in claim 1 , further comprising:

a rib that is formed between the partition wall and the filter; and

an interspace that is formed between the rib and the filter in a case where the filter is attached to the collecting box.

9. The waste developer collecting device as claimed in claim 1 , further comprising:

a detection window that is formed in a part of the collecting container on a downstream side in the conveying direction of the waste developer conveyed by the conveying unit, and

wherein

the detection window has a height being larger than a height of a lower surface of the partition wall.

10. The waste developer collecting device as claimed in claim 1 , further comprising:

a detection window that is formed at a position being different from a center of an upper surface of the collecting container toward the air inlet, in a part of the collecting container on a downstream side in the conveying direction of the waste developer conveyed by the conveying unit.

11. The waste developer collecting device as claimed in claim 1 ,

wherein

the air inlet is disposed higher than the collecting opening.

12. The waste developer collecting device as claimed in claim 1 ,

wherein

the conveying unit includes a coil rotating about the shaft.

13. An image forming apparatus comprising:

a waste developer collecting device that collects a waste developer discharged from image forming unit including a developing unit for developing an electrostatic latent image with a developer,

wherein

the waste developer collecting device includes:

a collecting container that collects the waste developer;

a collecting opening that is disposed on an inner wall surface of the collecting container to collect the waste developer and air discharged from the developing unit;

a conveying unit that is disposed in the collecting container, rotates about a shaft, and conveys the waste developer entering through the collecting opening in the collecting container;

a filter that passes the air collected in the collecting container through the collecting opening, and blocks the waste developer;

a partition wall that partitions an inside of the collecting container into the filter and a containing area for containing the waste developer; and

an air inlet that is formed in an end portion of the partition wall on an upstream side in a conveying direction of the waste developer conveyed by the conveying unit to send the air entering into the collecting container to the filter along the partition wall.