Toner cartridge with refillable fresh and residual toner chambers, process cartridge, and method of making toner cartridge reusable

1. A toner cartridge comprising:

a fresh toner storing chamber in which fresh toner is stored and has a mounting part for mounting a developer conveying member on a front side of the fresh toner storing chamber, the fresh toner being used for developing an image, and the fresh toner storing chamber having a fresh toner filling opening through which the fresh toner is filled therein; and

a residual toner collection chamber in which residual toner is collected, the residual toner being a toner removed after an image is developed by using the fresh toner, the residual toner collection chamber having a residual toner conveying opening and a pair of residual toner discharging openings through which the residual toner can be discharged therefrom, the fresh toner storing chamber and the residual toner collection chamber being arranged integrally,

wherein a longitudinal direction of the fresh toner storing chamber and a longitudinal direction of the residual toner collection chamber are in parallel, and wherein the residual toner collection chamber is positioned at a back side of the fresh toner storing chamber, the back side of the fresh toner storing chamber being opposite to the front side of the fresh toner storing chamber,

wherein one of the residual toner discharging openings is formed on a first lateral side of the residual toner collection chamber and the other of the residual toner discharging openings is formed on a second lateral side of the residual toner collection chamber, the second lateral side being opposite to the first lateral side in the longitudinal direction of the residual toner collection chamber,

wherein the fresh toner storing chamber and the residual toner collection chamber are partitioned by a slanting partitioning member such that the height of the front side of the residual toner collection chamber is smaller than the height of the back side of the residual toner collection chamber, whereby residual toner will tend to collect at the back side of the residual toner collection chamber, and

wherein the pair of residual toner discharging openings are positioned on the lateral sides of the residual toner collection chamber at locations closer to the front side of the residual toner collection chamber than to the back side of the residual toner collection chamber.

2. The toner cartridge according claim 1 , wherein the residual toner discharging openings have an identical shape.

3. The toner cartridge according to claim 1 , wherein, when the toner cartridge is fit in an image forming apparatus, the residual toner discharging openings are sealed by a sealing member.

4. The toner cartridge according to claim 3 , wherein, when the toner cartridge is fit in the image forming apparatus, the residual toner discharging openings are located above the residual toner conveying opening.

5. The toner cartridge according to claim 3 , wherein

the residual toner collection chamber includes a rotatable agitating member that conveys and agitates the residual toner, and

when the toner cartridge is fit in the image forming apparatus, the residual toner discharging openings are located above the agitating member.

6. The toner cartridge according to claim 1 , wherein a rib is arranged between the fresh toner filling opening and the residual toner conveying opening in a protruding manner with respect to the toner cartridge.

7. The toner cartridge according to claim 1 , wherein the fresh toner storing chamber and the residual toner collection chamber are partitioned by a flexible partitioning member.

8. A process cartridge that is configured by integrally arranging a photosensitive drum, a developing unit, and the toner cartridge according to claim 1 .