Paper feeding apparatus and image forming apparatus

1. A paper feeding apparatus comprising:

a paper feeder configured to feed out the uppermost paper included in a paper bundle;

a blower configured to blow gas to a blowing target area of a lateral side of the paper bundle; and

a processor configured to change a size of the blowing target area to which the gas is blown such that a vertical width of the blowing target area changes.

2. The paper feeding apparatus according to claim 1 , wherein

the processor is configured to, when papers included in the paper bundle satisfy a specific condition and/or when an environment of a place where the paper feeding apparatus is installed satisfies a predetermined specific condition, change the size of the blowing target area.

3. The paper feeding apparatus according to claim 2 , wherein

the processor is configured to, when a value specified by information about a thickness of the papers included in the paper bundle is smaller than a predetermined threshold and/or when a humidity of the place where the paper feeding apparatus is installed is lower than a predetermined threshold humidity, reduce the size of the blowing target area.

4. The paper feeding apparatus according to claim 1 , wherein

the blower comprises a guide surface configured to guide the gas blown to the lateral side, the guide surface being inclined to a flowing direction of the gas, and

the processor is configured to change the size of the blowing target area by changing an amount of the gas that goes toward the guide surface.

5. The paper feeding apparatus according to claim 1 , wherein

the blower is configured to blow the gas to the blowing target area that extends vertically and that includes a portion where the uppermost paper included in the paper bundle is positioned, and

the processor is configured to change the size of the blowing target area by changing a position of a lower end of the blowing target area.

6. The paper feeding apparatus according to claim 5 , wherein

the processor is configured to, when a value specified by information about a thickness of papers included in the paper bundle is smaller than a predetermined threshold and/or when a humidity of a place where the paper feeding apparatus is installed is lower than a predetermined threshold humidity, move the position of the lower end of the blowing target area upward so as to reduce the size of the blowing target area.

7. A paper feeding apparatus comprising:

a paper feeder configured to feed out the uppermost paper included in a paper bundle; and

a blower configured to blow gas to a lateral side of the paper bundle, the blower being configured to blow the gas to a guide surface that guides and changes the direction of the gas to go toward the lateral side, wherein:

a position of the guide surface with respect to the paper bundle can be changed,

the guide surface is disposed above the paper bundle in a state of facing toward the paper bundle, and

the paper feeding apparatus is configured to enter at least two states that comprise

a first state where a portion of the paper bundle is disposed at a position that faces the guide surface, and

a second state where the paper bundle is not disposed at the position that faces the guide surface.

8. The paper feeding apparatus according to claim 7 , wherein

the guide surface is convex upward and has a curvature,

the guide surface comprises one end and another end, and

the gas flows along the guide surface from the one end toward the other end, and then, is blown away from the guide surface toward the lateral side.

9. The paper feeding apparatus according to claim 7 , further comprising:

a processor configured to change the position of the guide surface with respect to the paper bundle, wherein

the processor is configured to, when an environment of a place where the paper feeding apparatus is installed satisfies a predetermined specific condition, change the position of the guide surface with respect to the paper bundle.