Image forming apparatus that corrects image forming positions
AssigneeCanon Kabushiki Kaisha
InventorsTakuya Hayakawa, Naoto Watanabe
Life of this patent
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Abstract
An image forming apparatus is configured to, based on a reading result of a test image, generate data that is used to adjust image forming positions of toner images to be formed by an image forming unit, control an image forming position of a first toner image to be formed by the image forming unit in a first contact state based on first data, the first toner image being transferred to a first sheet, and control an image forming position of a second toner image to be formed by the image forming unit in a second contact state based on second data that is different from the first data, the second toner image being transferred to a second sheet, wherein a type of the second sheet is the same type as the type of the first sheet.
Claims20
An image forming apparatus comprising:
- an image forming unit configured to form an image, the image forming unit including a first image carrier on which a black image is formed, and a second image carrier on which a color image different from the black image is formed;
- a belt member to which the black image and the color image are transferred;
- a transfer unit configured to transfer the black image and the color image from the belt member to a sheet;
- a mechanical mechanism configured to control contact states between the first image carrier and the belt member and between the second image carrier and the belt member, the contact states including:
- a first contact state in which the first image carrier is in contact with the belt member and the second image carrier is separated from the belt member;
- and
- a second contact state in which the first image carrier is in contact with the belt member and the second image carrier is in contact with the belt member;
- a controller configured to
- control the image forming unit and the mechanical mechanism to form, in the first contact state, a test image for the first contact state, the test image for the first contact state to be used for adjusting an image formation position of an image on a sheet to be formed in the first contact state, and
- control the image forming unit and the mechanical mechanism to form, in the second contact state, a test image for the second contact state, the test image for the second contact state to be used for adjusting an image formation position of an image on a sheet to be formed in the second contact state.
An image forming apparatus comprising:
- an image forming unit configured to form an image, the image forming unit including a first image carrier on which a first image in a first color is formed, and a second image carrier on which a second image in a second color different from the first color is formed;
- a belt member to which the first image and the second image are transferred;
- a transfer unit configured to transfer the first image and the second image from the belt member to a sheet;
- a mechanical mechanism configured to control contact states between the first image carrier and the belt member and between the second image carrier and the belt member, the contact states including:
- a first contact state in which the first image carrier is in contact with the belt member and the second image carrier is separated from the belt member;
- and
- a second contact state in which the first image carrier is in contact with the belt member and the second image carrier is in contact with the belt member;
- a controller configured to
- control the image forming unit and the mechanical mechanism to form, in the first contact state, a test image for the first contact state, the test image for the first contact state to be used for adjusting an image formation position of an image on a sheet to be formed in the first contact state, and
- control the image forming unit and the mechanical mechanism to form, in the second contact state, a test image for the second contact state, the test image for the second contact state to be used for adjusting an image formation position of an image on a sheet to be formed in the second contact state.
Dependencies are inferred from the claim text.