Image forming apparatus, method for processing information relating to sheet, and recording medium

1 . An image forming apparatus comprising:

a conveyor that conveys a sheet along a conveyance path;

a detector that is disposed on the conveyance path and detects a physical property of a sheet with first detection accuracy or second detection accuracy lower than the first detection accuracy;

an image former that forms an image on a sheet under an image forming condition based on a result of detection performed by the detector with the first detection accuracy; and

a central processing unit (CPU) that determines that a physical property of a sheet has changed among a plurality of sheets that is conveyed by the conveyor along the conveyance path on a basis of a result of detection performed by the detector on the plurality of sheets that is conveyed with the second detection accuracy, wherein

the conveyor makes conveyance speed at which the detector performs detection with the second detection accuracy faster than conveyance speed at which the detector performs detection with the first detection accuracy.

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

a number of times of sampling when the detector performs detection with the second detection accuracy is smaller than a number of times of sampling when the detector performs detection with the first detection accuracy.

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

detection time in which the detector performs detection with the second detection accuracy is shorter than detection time in which the detector performs detection with the first detection accuracy.

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

a detection area when the detector performs detection with the second detection accuracy is narrower than a detection area when the detector performs detection with the first detection accuracy.

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

in one print job, the detector performs detection operation on a first sheet with the first detection accuracy, and the detector performs detection operation on second and subsequent sheets with the second detection accuracy.

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

a container that contains a sheet, wherein

the detector performs detection operation on a first sheet after opening and closing operation of the container is performed with the first detection accuracy, and the detector performs detection operation on second and subsequent sheets with the second detection accuracy.

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

in a case where the CPU determines that a physical property of a sheet has changed among the plurality of sheets that is conveyed, the detector performs detection operation on a sheet after the CPU determines that the physical property of the sheet has changed or a first sheet of a next print job with the first detection accuracy.

8 . An image forming apparatus comprising:

a conveyor that conveys a sheet along a conveyance path;

a detector that is disposed on the conveyance path and detects a physical property of a sheet with first detection accuracy or second detection accuracy lower than the first detection accuracy;

an image former that forms an image on a sheet under an image forming condition based on a result of detection performed by the detector with the first detection accuracy;

a central processing unit (CPU) that determines that a physical property of a sheet has changed among a plurality of sheets that is conveyed by the conveyor along the conveyance path on a basis of a result of detection performed by the detector on the plurality of sheets that is conveyed with the second detection accuracy; and

an operation panel, wherein

the CPU outputs a determination result to the operation panel or an external apparatus upon determining that a physical property has changed among the plurality of sheets that is conveyed.

9 . A method for processing information relating to a sheet comprising:

by a conveyor, conveying a sheet along a conveyance path;

by a detector that is disposed on the conveyance path, detecting a physical property of a sheet with first detection accuracy or second detection accuracy lower than the first detection accuracy;

forming an image on a sheet under an image forming condition based on a result of detection performed by the detector with the first detection accuracy; and

determining that a physical property of a sheet has changed among a plurality of sheets that is conveyed by the conveyor along the conveyance path on a basis of a result of detection performed by the detector on the plurality of sheets that is conveyed with the second detection accuracy, wherein

by the conveyor, making conveyance speed at which the detector performs detection with the second detection accuracy faster than conveyance speed at which the detector performs detection with the first detection accuracy.

10 . A non-transitory recording medium storing a computer readable program for causing a computer of an image forming apparatus including a conveyer that conveys a sheet along a conveyance path, and a detector that is disposed on the conveyance path and detects a physical property of a sheet with first detection accuracy or second detection accuracy lower than the first detection accuracy,

to form an image on a sheet under an image forming condition based on a result of detection performed by the detector with the first detection accuracy, and

to determine that a physical property of a sheet has changed among a plurality of sheets that is conveyed by a conveyor along the conveyance path on a basis of a result of detection performed by the detector on the plurality of sheets that is conveyed with the second detection accuracy, wherein

to make, by the conveyor, conveyance speed at which the detector performs detection with the second detection accuracy faster than conveyance speed at which the detector performs detection with the first detection accuracy.