Image forming apparatus to perform reading operation in image size of image greater than size of sheet on which predetermined pattern is formed, control method thereof, and non-transitory computer-readable storage medium
AssigneeCanon Kabushiki Kaisha
InventorJun Itoh
Life of this patent
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Abstract
An image forming apparatus that reads a print position adjustment chart using an auto document feeder (ADF) and specifies an appropriate image reading size to include paper edges of the chart is provided.
Claims14
An image forming apparatus comprising:
- an image forming unit configured to form an image on a sheet;
- a conveying unit configured to convey the sheet on a conveyance path in a conveyance direction;
- a reading unit including at least one image sensor positioned along the conveyance path, the reading unit configured to read the sheet when the sheet reaches the at least one image sensor while the sheet is conveyed in the conveyance direction by the conveying unit;
- one or more processors;
- and
- at least one memory storing executable instructions, which when executed by the one or more processors, cause the image forming apparatus to perform operations comprising:
- cause the image forming unit to perform image formation processing for forming an image of a predetermined pattern on a sheet;
- cause the conveying unit to convey, in the conveyance direction, the sheet on which the image of the predetermined pattern is formed;
- cause, based on a size of the sheet on which the image of the predetermined pattern is formed, the reading unit to start performing image reading before a leading edge of the sheet on which the image of the predetermined pattern is formed conveyed by the conveying unit in the conveyance direction reaches the least one image sensor, such that the reading unit reads the sheet conveyed by the conveying unit in an image size greater than the size of the sheet on which the image of the predetermined pattern is formed;
- and
- obtain an adjustment value for use in image formation processing based on a result of the image reading.
A control method of an image forming apparatus including an image forming unit configured to form an image on a sheet, a conveying unit configured to convey the sheet on a conveyance path in a conveyance direction, and a reading unit including at least one image sensor positioned along the conveyance path, the reading unit configured to read the sheet when the sheet reaches the at least one image sensor while the sheet is conveyed in the conveyance direction by the conveying unit, the control method comprising:
- causing the image forming unit to perform image formation processing for forming an image of a predetermined pattern on a sheet;
- causing the conveying unit to convey, in the conveyance direction, the sheet on which the image of the predetermined pattern is formed;
- causing, based on a size of the sheet on which the image of the predetermined pattern is formed, the reading unit to start performing image reading before a leading edge of the sheet on which the image of the predetermined pattern is formed conveyed by the conveying unit in the conveyance direction reaches the least one image sensor, such that the reading unit reads the sheet conveyed by the conveying unit in an image size greater than the size of the sheet on which the image of the predetermined pattern is formed;
- and
- obtaining an adjustment value for use in image formation processing based on a result of the image reading.
A non-transitory computer-readable storage medium storing a program for causing a computer to perform a control method of an image forming apparatus including an image forming unit configured to form an image on a sheet, a conveying unit configured to convey the sheet on a conveyance path in a conveyance direction, and a reading unit including at least one image sensor positioned along the conveyance path, the reading unit configured to read the sheet when the sheet reaches the at least one image sensor while the sheet is conveyed in the conveyance direction by the conveying unit, the control method comprising:
- causing the image forming unit to perform image formation processing for forming an image of a predetermined pattern on a sheet;
- causing the conveying unit to convey, in the conveyance direction, the sheet on which the image of the predetermined pattern is formed;
- causing, based on a size of the sheet on which the image of the predetermined pattern is formed, the reading unit to start performing image reading before a leading edge of the sheet on which the image of the predetermined pattern is formed conveyed by the conveying unit in the conveyance direction reaches the least one image sensor, such that the reading unit reads the sheet conveyed by the conveying unit in an image size greater than the size of the sheet on which the image of the predetermined pattern is formed;
- and
- obtaining an adjustment value for use in image formation processing based on a result of the image reading.
Dependencies are inferred from the claim text.