Image forming apparatus including an attachable and detachable both-face printing device

1. An image forming apparatus comprising:

an image forming apparatus main body;

an image forming section that is arranged within the image forming apparatus main body, and that forms an image in a recording medium;

a discharging member that discharges the recording medium on which the image is formed by the image forming section;

a first driving source that normally rotates the discharging member;

a second driving source that normally and reversely rotates the discharging member; and

a both-face printing assembly body that returns the recording medium pulled-back by reversely rotating the discharging member to the image forming section,

wherein the both-face printing assembly body is freely attached and detached with respect to the image forming apparatus main body, and the driving source is freely attached and detached with respect to both the image forming apparatus main body and the both-face printing assembly body, and

wherein the discharging member comprises an engaging portion, the engaging portion adjustably disposed at a first position and a second position along an axial direction of the discharging member, the engaging portion disengaged from the second driving source and engaged with the first driving source at the first position when the second driving source is detached from the image forming apparatus main body and the engaging portion engaged with the second driving source and disengaged from the first driving source at the second position when the second deriving source is attached to the image forming apparatus main body.

2. An image forming apparatus comprising:

an image forming apparatus main body;

an image forming section that is arranged within the image forming apparatus main body, and that forms an image in a recording medium;

a first driving source that is arranged within the image forming apparatus main body;

a discharging member that is rotated in a normal direction by the first driving source, and that discharges the recording medium on which the image is formed by the image forming section;

a driving source assembly body that includes a second driving source for normally and reversely rotating the discharging member; and

a both-face printing assembly body that inverts the recording medium pulled-back by reversely rotating the discharging member, and that returns the recording medium to the image forming section,

wherein the driving source assembly body and the both-face printing assembly body are separately freely attached and detached with respect to the image forming apparatus main body, and

wherein the discharging member comprises an engaging portion, the engaging portion adjustably disposed at a first position and a second position along an axial direction of the discharging member, the engaging portion disengaged from the second driving source and engaged with the first driving source at the first position when the second driving source is detached from the image forming apparatus main body and the engaging portion engaged with the second driving source and disengaged from the first driving source at the second position when the second deriving source is attached to the image forming apparatus main body.

3. The image forming apparatus as claimed in claim 2 , further comprising:

a switching unit that performs a switching operation such that the first driving source is connected to the discharging member in a case where the driving source assembly body is not mounted to the image forming apparatus main body, and the second driving source is connected to the discharging member in a case where the driving source assembly body is mounted to the image forming apparatus main body.

4. The image forming apparatus as claimed in claim 3 , wherein the switching unit performs the switching operation in accordance with the attachment and detachment of the driving source assembly body.

5. The image forming apparatus as claimed in claim 2 , wherein the discharging member has a circumferential speed of a reverse rotating direction derived from the second driving source, the circumferential speed of the reverse rotating direction being faster than the circumferential speed of a normal rotating direction of the discharging member deriving from one of the first driving source and second driving source.

6. The image forming apparatus as claimed in claim 2 , wherein the image forming apparatus main body has a first side face and a second side face opposed to the first side face, and

the first driving source is arranged on a side of the first side face, and the driving source assembly body is arranged on a side of the second side face.

7. The image forming apparatus as claimed in claim 2 , wherein the image forming apparatus main body has a first side face and a second side face opposed to the first side face, and

the first driving source and the driving source assembly body are arranged on one of a side of the first side face and a side of the second side face.

8. The image forming apparatus as claimed in claim 7 , further comprising:

a driving control section that controls operations of the first driving source and second driving source,

wherein the driving control section is arranged on the same side of side face on which the first driving source and the driving source assembly body of the image forming apparatus main body are arranged.

9. The image forming apparatus as claimed in claim 2 , wherein the both-face printing assembly body comprises:

a conveying member for both faces that conveys the recording medium; and

a third driving source that operates the conveying member for both faces.

10. The image forming apparatus according to claim 9 , wherein a conveying speed of a reverse rotating direction of the recording medium using the second driving source is faster than the conveying speed of the recording medium using the third driving source.

11. An image forming apparatus comprising:

an image forming apparatus main body;

an image forming section that is arranged within the image forming apparatus main body, and that forms an image in a recording medium;

a first driving source that is arranged within the image forming apparatus main body;

a discharging member that is rotated in a normal direction by the first driving source, and discharging the recording medium on which the image is formed by the image forming section, the discharging member comprising an engaging portion that is adjustably disposed at a first position and a second position along an axial direction of the discharging member;

a driving source assembly body that includes a second driving source for normally and reversely rotating the discharging member;

a both-face printing assembly body that inverts the recording medium pulled-back by reversely rotating the discharging member, and that returns the recording medium to the image forming section; and

a switching unit that performs a switching operation to dispose the engaging portion at the first position such that the first driving source is connected to the discharging member through the engaging portion in a case where the driving source assembly body is not mounted to the image forming apparatus main body, and to dispose the engaging portion at the second position such that the first driving source is disengaged from the discharging member when the second driving source is connected to the discharging member in a case where the driving source assembly body is mounted to the image forming apparatus main body.

12. The image forming apparatus as claimed in claim 11 , wherein the switching unit performs the switching operation in accordance with the attachment and detachment of the driving source assembly body.

13. An image forming apparatus comprising:

an image forming apparatus main body;

an image forming section that is arranged within the image forming apparatus main body, and that forms an image in a recording medium;

a discharging member that discharges the recording medium on which the image is formed by the image forming section;

a first driving source that normally rotates the discharging member;

a driving source assembly body that includes a second driving source for normally and reversely rotates the discharging member; and

a both-face printing assembly body that inverts the recording medium pulled-back by reversely rotating the discharging member, and that returns the recording medium to the image forming section,

wherein the driving source and the both-face printing assembly body being separately mounted to the image forming apparatus main body, and

wherein the discharging member comprises an engaging portion, the engaging portion adjustably disposed at a first position and a second position along an axial direction of the discharging member, the engaging portion disengaged from the second driving source and engaged with the first driving source at the first position when the second driving source is detached from the image forming apparatus main body and the engaging portion engaged with the second driving source and disengaged from the first driving source at the second position when the second deriving source is attached to the image forming apparatus main body.

14. An image forming apparatus comprising:

an image forming apparatus main body;

an image forming section that is arranged within the image forming apparatus main body, and that forms an image in a recording medium;

a first driving source that is arranged within the image forming apparatus main body;

a discharging member that is rotated in a normal direction by the first driving source, and that discharges the recording medium on which the image is formed by the image forming section;

a driving source assembly body that includes a second driving source for normally and reversely rotating the discharging member; and

a both-face printing assembly body that inverts the recording medium pulled-back by reversely rotating the discharging member, and that returns the recording medium to the image forming section,

wherein the driving source and the both-face printing assembly body being separately mounted to the image forming apparatus main body, and

wherein the discharging member comprises an engaging portion, the engaging portion adjustably disposed at a first position and a second position along an axial direction of the discharging member, the engaging portion disengaged from the second driving source and engaged with the first driving source at the first position when the second driving source is detached from the image forming apparatus main body and the engaging portion engaged with the second driving source and disengaged from the first driving source at the second position when the second deriving source is attached to the image forming apparatus main body.

15. The image forming apparatus as claimed in claim 13 , wherein the both-face printing assembly body is mounted to the image forming apparatus main body, and the driving source is mounted to the image forming apparatus main body separately from the both-face printing assembly body.