Paper ejection device and image forming apparatus

1. A paper ejection device comprising:

an ejection portion that ejects sheets of paper;

a housing portion that houses the ejected sheets of paper in a sequentially stacked state; and

a guiding portion that guides the sheets of paper, before being ejected, to the ejection portion while curving the sheets of paper,

wherein the housing portion is adjustable to a plurality of angles including at least an angle at which the ejected sheets of paper are housed while being curved in a direction opposite to a direction in which the sheets of paper have been curved by the guiding portion,

wherein the angle of the housing portion at which the housing portion houses the sheets of paper while curving the sheets of paper is changed in accordance with a number of the sheets of paper housed in the housing portion such that the angle is changed to such a direction that the sheets of paper are curved by the housing portion more gently as a larger number of the sheets of paper are housed in the housing portion.

2. The paper ejection device according to claim 1 ,

wherein the housing portion houses the ejected sheets of paper while being curved in the direction opposite to the direction in which the sheets of paper have been curved by the guiding portion at all angles within an angular range in which the housing portion is adjustable.

3. The paper ejection device according to claim 1 , further comprising

a heating portion that heats the sheets of paper before being ejected,

wherein the housing portion is adjustable to a plurality of angles including at least an angle at which the sheets of paper are housed while being curved in the direction opposite to the direction in which the sheets of paper have been curved by the guiding portion and more sharply than curved by the guiding portion.

4. The paper ejection device according to claim 3 ,

wherein the housing portion houses the sheets of paper while being curved in the direction opposite to the direction in which the sheets of paper have been curved by the guiding portion and more sharply than curved by the guiding portion at all angles within an angular range in which the housing portion is adjustable.

5. The paper ejection device according to claim 1 ,

wherein the housing portion is supported by a spring member adjusted such that the angle of the housing portion is changed in accordance with a weight of the sheets of paper housed in the housing portion.

6. The paper ejection device according to claim 1 ,

wherein the housing portion is supported by a spring member adjusted such that the angle of the housing portion is changed when the sheets of paper ejected from the ejection portion abut against the housing portion.

7. The paper ejection device according to claim 1 ,

wherein the housing portion includes a first housing portion, which is fixed, and a second housing portion that houses the sheets of paper in place of the first housing portion when the second housing portion is mounted.

8. An image forming apparatus comprising:

an image forming section that forms an image on paper; and

the paper ejection device according to claim 1 , which ejects the paper on which the image has been formed.

9. A paper ejection device comprising:

an ejection portion that ejects sheets of paper;

a housing portion that houses the ejected sheets of paper in a sequentially stacked state;

a guiding portion that guides the sheets of paper, before being ejected, to the ejection portion while curving the sheets of paper; and

a heating portion that heats the sheets of paper before being ejected,

wherein the housing portion is movable to a plurality of positions, with respect to the ejection portion, including at least a position at which the sheets of paper are housed while being curved in a direction opposite to a direction in which the sheets of paper have been curved by the guiding portion and more sharply than curved by the guiding portion,

wherein a position of the housing portion is changed in accordance with a number of the sheets of paper housed in the housing portion such that the housing portion is moved in a direction farther away from the ejection portion as a larger number of the sheets of paper are housed in the housing portion.

10. The paper ejection device according to claim 9 ,

wherein the housing portion houses the sheets of paper while curving the sheets of paper in the direction opposite to the direction in which the sheets of paper have been curved by the guiding portion and more sharply than curved by the guiding portion at all positions within a distance range in which the housing portion is movable.

11. The paper ejection device according to claim 9 ,

wherein the housing portion is supported by a spring member adjusted such that the position of the housing portion is changed in accordance with a weight of the sheets of paper housed in the housing portion.

12. The paper ejection device according to claim 9 ,

wherein the housing portion is supported by a spring member adjusted such that the position of the housing portion is changed when the sheets of paper ejected from the ejection portion abut against the housing portion.