Image formation device

Abstract

To inexpensively and accurately maintain the shape of an image on an image formation device.SOLUTION: An image formation device includes recording means for forming an image on a sheet being sucked by carrying means and carried in a prescribed direction. The recording means forms a test image on the sheet. Reading means reads the test image from the sheet being carried by the carrying means. Control means controls a shape of an image to be formed on the sheet based on a reading result of the test image and data on an inclination of alignment of the reading means relative to the prescribed carrying direction.SELECTED DRAWING: Figure 11

Claims

1. A conveying means for transporting the sheet while supporting it, A recording means is provided which a plurality of nozzles for ejecting ink are arranged along a first direction, and an image is formed on the sheet supported by the transport means by the ink ejected from the plurality of nozzles, A reading means for reading the sheet on which the image has been formed by the recording means, A storage means for storing data relating to the inclination of the reading means, A control means that controls the recording means to form a test image on a sheet, and determines the tilt in the first direction with respect to the second direction based on the reading result of the sheet on which the test image has been formed as read by the reading means and data on the tilt of the reading means stored in the storage means, An image forming apparatus having

2. The image forming apparatus according to claim 1, wherein the control means adjusts the shape of the image to be formed by the recording means based on the inclination of the first direction with respect to the second direction.

3. The image forming apparatus according to claim 1, wherein the second direction is the conveying direction in which the conveying means conveys the sheet.

4. The image forming apparatus according to claim 1, wherein the inclination of the reading means is the inclination of the reading means with respect to the transport direction in which the transport means transports the sheet.

5. The image forming apparatus according to claim 1, wherein the control means adjusts the transport direction in which the transport means transports the sheet based on the inclination of the first direction with respect to the second direction.

6. The image forming apparatus according to claim 1, wherein the control means adjusts the ejection timing for ejecting the ink from the plurality of nozzles based on the inclination of the first direction with respect to the second direction.

7. The image forming apparatus according to claim 1, wherein the control means adjusts the mounting angle of the recording means based on the inclination in the first direction with respect to the second direction.

8. The image forming apparatus according to claim 1, wherein the control means deforms the image to be formed by the recording means based on the inclination in the first direction with respect to the second direction.

9. The image forming apparatus according to claim 1, wherein the control means causes the reading means to read a calibration chart for detecting the inclination of the reading means, and generates the data based on the reading result of the calibration chart by the reading means.

10. The image forming apparatus according to claim 1, wherein the control means determines the inclination of the test image on the sheet based on the reading result of the sheet on which the test image is formed, and determines the inclination in the first direction with respect to the second direction based on the data stored in the storage means and the inclination of the test image on the sheet.

11. The data is the amount of inclination of the reading means with respect to the transport direction in which the transport means transports the sheet, The image forming apparatus according to claim 9, wherein the control means determines the tilt in the first direction with respect to the second direction by subtracting the amount of tilt from the tilt of the test image on the sheet.

12. The data is the amount of inclination of the reading means with respect to the transport direction in which the transport means transports the sheet, The test image includes a plurality of reference images formed in the four corner regions of the sheet, The control means is From among the plurality of reference images, the first inclination between the straight line connecting the first reference image and the second reference image and the leading edge of the sheet in the transport direction is determined based on the reading result of the sheet on which the test image is formed, as read by the reading means. The second inclination between the straight line connecting the third reference image and the fourth reference image among the plurality of reference images, and the rear edge of the sheet in the transport direction, is determined based on the reading result of the sheet on which the test image is formed, as read by the reading means. Determine the average value of the first slope and the second slope. The image forming apparatus according to claim 1, wherein the tilt in the first direction with respect to the second direction is determined by subtracting the amount of tilt of the reading means from the average value.

13. The data is the amount of inclination of the reading means with respect to the transport direction in which the transport means transports the sheet, The test image includes a plurality of reference images formed on the leading edge side of the sheet in the transport direction, The control means is The inclination between the straight line connecting the first reference image and the second reference image among the plurality of reference images, and the leading edge of the sheet in the transport direction, is determined based on the reading result of the sheet on which the test image is formed, as read by the reading means. The image forming apparatus according to claim 1, wherein the inclination in the first direction with respect to the second direction is determined by subtracting the amount of inclination of the reading means from the inclination between the straight line and the tip edge.

14. The data is the amount of inclination of the reading means with respect to the transport direction in which the transport means transports the sheet, The test image includes a plurality of reference images formed on the rear end side of the sheet in the transport direction, The control means is The inclination between the straight line connecting the first reference image and the second reference image among the plurality of reference images, and the rear edge of the sheet in the transport direction, is determined based on the reading result of the sheet on which the test image is formed, as read by the reading means. The image forming apparatus according to claim 1, wherein the inclination in the first direction with respect to the second direction is determined by subtracting the amount of inclination of the reading means from the inclination between the straight line and the rear end edge.

15. The recording means repeatedly forms the test image on a plurality of sheets, The image forming apparatus according to claim 1, wherein the control means determines the inclination of the first direction with respect to the second direction based on the reading results of the plurality of sheets on which the test images read by the reading means are formed and the data stored in the storage means.

Images