Image forming apparatus, conveyance control method, and recording medium

1. An image forming apparatus comprising:

a printing device configured to print, on a recording medium, a colorimetric pattern including a plurality of colorimetric patches;

an imaging device configured to capture and read an image on the recording medium;

a conveyor configured to convey the recording medium in a conveyance direction; and

circuitry configured to:

cause the printing device to form a plurality of marker patterns on a side of the colorimetric pattern on the recording medium and at predetermined intervals in the conveyance direction, the plurality of marker patterns including a downstream marker pattern positioned downstream from a first row of the plurality of colorimetric patches in the conveyance direction;

cause the conveyor to convey the recording medium to position the colorimetric pattern on the recording medium at a reading position by the imaging device based on a distance between a center coordinate of the plurality of marker patterns and a center coordinate of the colorimetric pattern in the conveyance direction; and

cause the imaging device to read the colorimetric pattern on the recording medium.

2. The image forming apparatus according to claim 1 , wherein the circuitry is configured to:

cause the conveyor to convey the recording medium to position one of the plurality of marker patterns at the reading position by the imaging device;

cause the imaging device to capture the recording medium to detect the one of the plurality of marker patterns; and

cause the conveyor to convey the recording medium to position the downstream marker pattern at the reading position based on a detection result.

3. The image forming apparatus according to claim 1 , wherein the plurality of marker patterns is distinguishable from each other by a difference in shape and a position in a main scanning direction in which the printing device moves.

4. The image forming apparatus according to claim 1 , wherein the circuitry is configured to:

cause the conveyor to convey the recording medium to position the downstream marker pattern at the reading position by the imaging device; and

cause the conveyor to convey the recording medium in the conveyance direction, to align a center of the colorimetric pattern with the reading position by the imaging device in the conveyance direction.

5. The image forming apparatus according to claim 4 , wherein the circuitry is configured to:

cause the conveyor to convey the recording medium to position the plurality of marker patterns at the reading position by the imaging device in a first conveyance control;

calculate a distance from one of the plurality of marker patterns detected on a captured image by the imaging device to the downstream marker pattern; and

based on the calculated distance, cause the conveyor to convey the recording medium to adjust the position of the colorimetric pattern at the reading position by the imaging device in a second conveyance control.

6. The image forming apparatus according to claim 5 , wherein the circuitry is configured to cause the conveyor to convey the recording medium at a first speed in the first conveyance control, the first speed faster than a second speed at which the conveyor conveys the recording medium in the second conveyance control.

7. A method for conveying a recording medium by an image forming apparatus configured to perform colorimetry, the method comprising:

conveying the recording medium in a conveyance direction;

printing, on the recording medium, a colorimetric pattern including a plurality of colorimetric patches;

printing a plurality of marker patterns on a side of the colorimetric pattern on the recording medium and at predetermined intervals in the conveyance direction, the plurality of marker patterns including a downstream marker pattern positioned downstream from a first row of the plurality of colorimetric patches in the conveyance direction;

conveying the recording medium to position the colorimetric pattern on the recording medium at a reading position by an imaging device based on a distance between a center coordinate of the plurality of marker patterns and a center coordinate of the colorimetric pattern in the conveyance direction; and

reading the colorimetric pattern on the recording medium.

8. A non-transitory recording medium storing a plurality of program codes which, when executed by one or more processors, causes the processors to perform a method, the method comprising:

conveying a recording medium in a conveyance direction;

printing, on the recording medium, a colorimetric pattern including a plurality of colorimetric patches;

printing a plurality of marker patterns on a side of the colorimetric pattern on the recording medium and at predetermined intervals in the conveyance direction, the plurality of marker patterns including a downstream marker pattern positioned downstream from a first row of the plurality of colorimetric patches in the conveyance direction;

conveying the recording medium to position the colorimetric pattern on the recording medium at a reading position by an imaging device based on a distance between a center coordinate of the plurality of marker patterns and a center coordinate of the colorimetric pattern in the conveyance direction; and

reading the colorimetric pattern on the recording medium.