Image forming apparatus having an image forming unit arranged detachably to an apparatus body and having an image carrier, an exposure device, arranged in the apparatus body, for exposing the image carrier, and a cleaner for cleaning the exposure device

1. An image forming apparatus comprising:

an image forming unit having an image carrier and being arranged detachably to an apparatus body;

a unit supporting member provided to the apparatus body, for supporting the image forming unit in a detachably inserting manner; and

an exposure device, arranged in facing the image carrier while the image forming unit is attached to the apparatus body, for exposing a surface of the image carrier,

wherein the unit supporting member includes a first contact supporting portion for supporting the image forming unit, and a second contact supporting portion disposed on a downstream side of the first contact supporting portion in a taking out direction of the image forming unit from the unit supporting member for forming a step portion projecting from a level of the first contact supporting portion, and

wherein the image forming unit includes a first contact supported portion contacting and being supported by the first contact supporting portion, a second contact supported portion contacting and being supported by the second contact supporting portion, and a cleaner for cleaning the exposure device when the image forming unit is taken out from the unit supporting member.

2. The image forming apparatus according to claim 1 , wherein the first and second contact supported portions are formed at a supported portion formed in extending in a longitudinal direction of the image forming unit, and wherein the supported portion slides over the step portion when image forming unit is taken out from the unit supporting member.

3. The image forming apparatus according to claim 1 , wherein the cleaner is disposed on a downstream side of the first contact supported portion in the taking out direction of the image forming unit.

4. The image forming apparatus according to claim 1 , wherein the cleaner makes cleaning on the exposure device by contacting the exposure device.

5. The image forming apparatus according to claim 1 , wherein the cleaner has a first edge contacting the exposure device when the image forming unit is taken out from the unit supporting member, and a second edge contacting the exposure device when the image forming unit is inserted into the unit supporting member.

6. The image forming apparatus according to claim 1 , further comprising a first supporting portion extending in a longitudinal direction of the unit support member,

wherein the first contact supporting portion is formed at the first supporting portion.

7. The image forming apparatus according to claim 1 , further comprising a stopper member attached to an end in a downstream side of the unit support member in the taking out direction of the image forming unit, for preventing the image forming unit from detaching from the unit support member,

wherein the second contact supporting portion is formed at a top surface of the stopper member.

8. The image forming apparatus according to claim 1 , wherein the second contact supporting portion forms the step portion as projecting from the first contact supporting portion in a direction such that the cleaner comes closer to the image forming unit.

9. The image forming apparatus according to claim 1 , wherein the first contact supporting portion includes a supporting surface, and wherein the image forming unit is inclined in a prescribed angle toward a direction such that a lower end of the image forming unit in the taking out direction is separated more from the support surface than an upper end thereof where the first contact supporting portion is in contact with the first contact supported portion and where the second contact supporting portion is in contact with the second contact supported portion.

10. The image forming apparatus according to claim 9 , wherein the prescribed angle is defined as angle θ, and wherein the angle θ is equal to or less than 45 degrees during a process that the image forming unit is taken out from the apparatus body.

11. The image forming apparatus according to claim 1 , wherein the cleaner is formed of a plate shaped elastic body extending in a direction substantially perpendicular to the taking out direction where the image forming unit is attached to the apparatus body.

12. The image forming apparatus according to claim 1 , wherein the cleaner is formed of a plate shaped elastic body held on only one side with a holder extending a proximal end of the plate shaped elastic body.

13. The image forming apparatus according to claim 1 , wherein the exposure device is an LED head having a lens surface extending in a longitudinal direction thereof, which is substantially the same as the taking out direction of the image forming unit.

14. An image forming apparatus comprising:

an image forming unit having an image carrier and being arranged detachably to an apparatus body;

a unit supporting member provided to the apparatus body, for supporting the image forming unit in a detachably inserting manner; and

an exposure device, arranged in facing the image carrier while the image forming unit is attached to the apparatus body, for exposing a surface of the image carrier, and

a cleaner for cleaning the exposure device when the image forming unit is taken out from the apparatus body,

wherein, during a process that the image forming unit is taken out from the apparatus body, the cleaner contacts the exposure device with contact pressure increasing as the image forming unit is further taken out from the apparatus body.

15. The image forming apparatus according to claim 14 , wherein the cleaner is formed of a plate shaped elastic body extending in a direction substantially perpendicular to the taking out direction where the image forming unit is attached to the apparatus body.