Image forming apparatus

1. An image forming apparatus comprising:

a process unit that is used for an image forming operation for forming an image on a sheet and detachable from a main body of the image forming apparatus;

a storage unit that stores operation history information indicating an operation history of the process unit;

a detection unit that detects that the process unit is replaced with a new process unit; and

a determination unit that determines a replacement timing of the new process unit on a basis of the operation history information of the process unit in a case where the detection unit detects the replacement,

wherein the storage unit further stores operation history information indicating an operation history of the new process unit, and the determination unit further corrects the replacement timing of the new process unit on a basis of the operation history information of the new process unit.

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

a notification unit that notifies a user of the replacement timing of the new process unit determined by the determination unit at a time when the process unit is replaced with the new process unit.

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

the determination unit determines the replacement timing of the new process unit on a basis of the operation history information of the process unit in a predetermined period before the process unit is replaced with the new process unit.

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

a communication unit that communicates with a different image forming apparatus or a computer via a network, wherein

the determination unit acquires, from the different image forming apparatus or the computer, operation history information of a process unit of the different image forming apparatus at a time of installation of the image forming apparatus, and determines a replacement timing of the process unit of the image forming apparatus on a basis of the operation history information of the process unit of the different image forming apparatus.

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

at the time of installation of the image forming apparatus, in a case of acquiring pieces of operation history information of process units of a plurality of different image forming apparatuses, the determination unit determines a replacement timing of the process unit of the image forming apparatus by using operation history information having an earliest replacement timing of the process unit of the image forming apparatus among the pieces of operation history information acquired.

6. The image forming apparatus according to claim 1 , wherein the operation history information includes any of temperature information and humidity information which are measured by the image forming apparatus.

7. The image forming apparatus according to claim 1 , wherein the operation history information includes information indicating a number of sheets on which image formation is performed, a type of a sheet, or properties of the sheet.

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

the process unit includes a rotating member and

the operation history information includes information indicating a number of rotations of the rotating member.

9. The image forming apparatus according to claim 1 , wherein the process unit includes a member that outputs a bias and

the operation history information includes information indicating a value of the bias or a value of an electric current that flows following an output of the bias.

10. The image forming apparatus according to claim 1 , wherein the replacement timing is indicated by a number of sheets on which image formation is performed.