Image forming apparatus

1. An image forming apparatus comprising:

an image carrier configured to carry an image;

a transfer unit configured to transfer the image to a medium; and

a cleaner configured to remove deposits on a surface of the image carrier after passing through a position of the transfer unit, wherein

when a type of a medium to be used is a first medium, the cleaner improves an ability to remove the deposits from the image carrier by changing operating characteristics of the cleaner, as compared with a case where the medium to be used is a second medium having a lower transfer sensitivity than the first medium,

wherein the first medium is a medium having a lower density than the second medium.

2. The image forming apparatus according to claim 1 , wherein the first medium has a higher surface roughness than the second medium.

3. The image forming apparatus according to claim 1 , further comprising:

a determining unit configured to determine the type of the medium.

4. The image forming apparatus according to claim 1 , wherein

the cleaner comprises

a rotary cleaner configured to rotate and clean the image carrier while contacting the image carrier, and

a contact cleaner that is disposed downstream of the rotary cleaner in a rotation direction of the image carrier, the contact cleaner being configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, a rotation speed of the rotary cleaner is increased as compared with the case where the medium to be used is the second medium having the lower transfer sensitivity, so as to improve an ability to remove discharge products.

5. The image forming apparatus according to claim 4 , wherein

the cleaner further comprises

a deposit remover unit configured to remove deposits attached to the rotary cleaner while contacting the rotary cleaner, and

when the medium to be used is the first medium, a contact of the deposit remover with the rotary cleaner is caused to become weaker as compared with the case where the medium to be used is the second medium.

6. The image forming apparatus according to claim 1 , wherein

the cleaner comprises

a brush-like cleaner that includes a plurality of bristles, the brush-like cleaner configured to clean the image carrier while contacting the image carrier, and

a contact cleaner that is disposed downstream of the brush-like cleaner in a rotation direction of the image carrier, the contact cleaner being configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, density of the plurality of bristles is increased to improve an ability to remove discharge products as compared with the case where the medium to be used is the second medium.

7. The image forming apparatus according to claim 6 , wherein

the brush-like cleaner has long bristles and short bristles,

when the medium to be used is the second medium, only the long bristles are brought into contact with the image carrier, and

when the medium to be used is the first medium, the brush-like cleaner is moved toward to the image carrier and the long bristles and the short bristles are brought into contact with the image carrier so as to increase the density of the bristles.

8. The image forming apparatus according to claim 6 , wherein

the brush-like cleaner comprises

a first brush-like cleaner having bristles, and

a second brush-like cleaner having bristles that are lower in density than the first brush-like cleaner,

when the medium to be used is the first medium, the first brush-like cleaner is brought into contact with the image carrier, and

when the medium to be used is the second medium, the second brush-like cleaner is brought into contact with the image carrier.

9. The image forming apparatus according to claim 1 , wherein

the cleaner comprises a contact cleaner configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, a contact pressure of the contact cleaner to the image carrier is increased as compared with the case where the medium to be used is the second medium, so as to improve an ability to remove discharge products.

10. The image forming apparatus according to claim 2 , wherein

the cleaner comprises a contact cleaner configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, a contact pressure of the contact cleaner to the image carrier is increased as compared with the case where the medium to be used is the second medium, so as to improve an ability to remove discharge products.

11. The image forming apparatus according to claim 9 , wherein

the contact cleaner comprises

a first contact cleaner configured to clean the image carrier while contacting the image carrier, and

a second contact cleaner that is disposed downstream of the first contact cleaner in a rotation direction of the image carrier, the second contact cleaner being configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, a contact pressure of the second contact cleaner to the image carrier is increased as compared with the case where the medium to be used is the second medium.

12. The image forming apparatus according to claim 10 , wherein

the contact cleaner comprises

a first contact cleaner configured to clean the image carrier while contacting the image carrier, and

a second contact cleaner that is disposed downstream of the first contact cleaner in a rotation direction of the image carrier, the second contact cleaner being configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, a contact pressure of the second contact cleaner to the image carrier is increased as compared with the case where the medium to be used is the second medium.

13. The image forming apparatus according to claim 9 , wherein

the contact cleaner comprises

a first contact cleaner configured to clean the image carrier while contacting the image carrier, and

a second contact cleaner that is disposed downstream of the first contact cleaner in a rotation direction of the image carrier, the second contact cleaner being configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, a contact pressure of the first contact cleaner to the image carrier is increased as compared with the case where the medium to be used is the second medium.

14. The image forming apparatus according to claim 10 , wherein

the contact cleaner comprises

a first contact cleaner configured to clean the image carrier while contacting the image carrier, and

a second contact cleaner that is disposed downstream of the first contact cleaner in a rotation direction of the image carrier, the second contact cleaner being configured to clean the image carrier while contacting the image carrier, and

when the medium to be used is the first medium, a contact pressure of the first contact cleaner to the image carrier is increased as compared with the case where the medium to be used is the second medium.

15. An image forming apparatus comprising:

image carrying means for carrying an image;

transfer means for transferring the image to a medium; and

cleaning means for removing deposits on a surface of the image carrying means after passing through a position of the transfer means, wherein

when a type of a medium to be used is a first medium, the operation of the cleaning is changed to remove the deposits from the image carrying means as compared with a case where the medium to be used is a second medium having a lower transfer sensitivity than the first medium,

wherein the first medium is a medium having a lower density than the second medium.