Abstract: An image forming apparatus includes an image forming unit configured to form an image on a sheet based on an image forming condition, a conveyance unit configured to convey a sheet having a pattern image formed thereon by the image forming unit to a conveyance path, the pattern image including a plurality of patch images and a trigger image used for controlling a reading timing for each of the plurality of patch images, a reading unit configured to read the pattern image on the sheet while the sheet having the pattern image formed thereon is conveyed by the conveyance unit, and a controller configured to, in a case of forming the pattern image on a first sheet having a first basis weight, control the image forming unit so as to form a first pattern image on the first sheet.

Abstract: An image forming apparatus includes an image forming portion, an oblique movement correcting portion including a first registration roller pair and a first moving portion, a reversing portion, and a re-feeding portion. The reversing portion includes a reversing roller pair and a second moving portion. The re-feeding portion includes a second registration roller pair. When an image is formed on a second surface of a sheet opposite from a first surface of the sheet, a side end position of the sheet is corrected by the second moving portion and oblique movement of the sheet is corrected, and then the side end position of the sheet is corrected again by the first moving means and the sheet is fed to the image forming portion.

Abstract: An image forming apparatus includes an image forming unit configured to form an image on a sheet, a discharge conveyance path configured to discharge the sheet on which the image is formed by the image forming unit to outside, a reverse conveyance path configured to reverse a conveyance direction of the conveyed sheet and convey the sheet, a first conveyance path configured to guide the sheet conveyed from the image forming unit to the reverse conveyance path, a second conveyance path configured to guide the sheet reversed in the reverse conveyance path from the reverse conveyance path to the discharge conveyance path, and a reading unit configured to read the image of the sheet in the second conveyance path.

Abstract: An image forming apparatus includes an image forming portion, an oblique movement correcting portion including a first registration roller pair and a first moving portion, a reversing portion, and a re-feeding portion. The reversing portion includes a reversing roller pair and a second moving portion. The re-feeding portion includes a second registration roller pair. When an image is formed on a second surface of a sheet opposite from a first surface of the sheet, a side end position of the sheet is corrected by the second moving portion and oblique movement of the sheet is corrected, and then the side end position of the sheet is corrected again by the first moving means and the sheet is fed to the image forming portion.

Abstract: An image forming apparatus includes an image forming unit, a conveyance guide having an opening portion, a measurement unit including a light entrance portion, and a moving member including a reference portion. The measuring unit is configured to measure an image on a sheet through the opening portion in a first state where the measurement unit is positioned in a first position and the moving member is positioned in a third position. The measurement unit is configured to measure the reference portion in a second state where the measurement unit is positioned in a second position and the moving member is positioned in a fourth position.

Abstract: An image forming apparatus includes an image forming unit configured to form an image on a sheet, a discharge conveyance path configured to discharge the sheet on which the image is formed by the image forming unit to outside, a reverse conveyance path configured to reverse a conveyance direction of the conveyed sheet and convey the sheet, a first conveyance path configured to guide the sheet conveyed from the image forming unit to the reverse conveyance path, a second conveyance path configured to guide the sheet reversed in the reverse conveyance path from the reverse conveyance path to the discharge conveyance path, and a reading unit configured to read the image of the sheet in the second conveyance path.

Abstract: An image forming apparatus includes an image forming unit, a conveyance guide having an opening portion, a measurement unit including a light entrance portion, and a moving member including a reference portion. The measuring unit is configured to measure an image on a sheet through the opening portion in a first state where the measurement unit is positioned in a first position and the moving member is positioned in a third position. The measurement unit is configured to measure the reference portion in a second state where the measurement unit is positioned in a second position and the moving member is positioned in a fourth position.

Abstract: An image forming apparatus includes an image forming portion, an oblique movement correcting portion including a first registration roller pair and a first moving portion, a reversing portion, and a re-feeding portion. The reversing portion includes a reversing roller pair and a second moving portion. The re-feeding portion includes a second registration roller pair. When an image is formed on a second surface of a sheet opposite from a first surface of the sheet, a side end position of the sheet is corrected by the second moving portion and oblique movement of the sheet is corrected, and then the side end position of the sheet is corrected again by the first moving means and the sheet is fed to the image forming portion.

Abstract: A measurement apparatus includes a first conveyance path, a second conveyance path, a measuring portion, a third conveyance path and a sheet stacking portion. A sheet discharged out of an image forming apparatus is conveyed toward a downstream apparatus through the first conveyance path. The second conveyance path is branched from the first conveyance path, extended below the first conveyance path, and merged with the first conveyance path. The measuring portion is disposed on the second conveyance path. The third conveyance path is provided above the first conveyance path and is configured to convey the sheet from which a test image has been measured by the measuring portion in the second conveyance path. The sheet stacking portion is provided above the first conveyance path, and the sheet discharged out of the third conveyance path is stacked on the sheet stacking portion.

Abstract: A measurement apparatus includes a sheet stacking portion provided above a first conveyance path and on which a second sheet discharged out of a second conveyance path is stacked. The sheet stacking portion includes an extension tray configured to support the sheet discharged out of the second conveyance path and to be movable between a first position and a second position, the first position being a position where the extension tray is located inside a width of the measurement apparatus in the horizontal direction, and the second position being a position where the extension tray is located above an upstream apparatus and is overlapped with the upstream apparatus when viewed in a gravity direction.

Abstract: A measurement apparatus includes a first conveyance path, a second conveyance path, a measuring portion, a third conveyance path and a sheet stacking portion. A sheet discharged out of an image forming apparatus is conveyed toward a downstream apparatus through the first conveyance path. The second conveyance path is branched from the first conveyance path, extended below the first conveyance path, and merged with the first conveyance path. The measuring portion is disposed on the second conveyance path. The third conveyance path is provided above the first conveyance path and is configured to convey the sheet from which a test image has been measured by the measuring portion in the second conveyance path. The sheet stacking portion is provided above the first conveyance path, and the sheet discharged out of the third conveyance path is stacked on the sheet stacking portion.

Abstract: The present invention makes it possible to reduce the number of constituent components, and to provide a bobbin body having a smooth surface. A bobbin for a thermal transfer sheet or an image-receiving sheet includes a cylindrical bobbin body 11, wherein a gear 12 including a plurality of teeth 13 is formed on one side end of the bobbin body 11. Each tooth 13 of the gear 12 has a parallelogram shape as a whole, when viewed from a lateral side.

Abstract: An image forming apparatus forms a measurement image on a sheet, moves a carriage to read the measurement image, reads from a storage unit an adjustment condition, generates a correction condition based on the adjustment condition and a result of reading the measurement image, moves the carriage to read an original, generates image data of the original, corrects a position at which an image is formed on a sheet based on the correction condition and forms an image of the original on a sheet based on the corrected image data.

Abstract: The present invention makes it possible to reduce the number of constituent components, and to provide a bobbin body having a smooth surface. A bobbin for a thermal transfer sheet or an image-receiving sheet includes a cylindrical bobbin body 11, wherein a a gear 12 including a plurality of teeth 13 is formed on one side end of the bobbin body 11. Each tooth 13 of the gear 12 has a parallelogram shape as a whole, when viewed from a lateral side.

Abstract: The present invention makes it possible to reduce the number of constituent components, and to provide a bobbin body having a smooth surface. A bobbin for a thermal transfer sheet or an image-receiving sheet includes a cylindrical bobbin body 11, wherein a gear 12 including a plurality of teeth 13 is formed on one side end of the bobbin body 11. Each tooth 13 of the gear 12 has a polygonal shape with not less than five corners as a whole, when viewed from a lateral side.

Abstract: Temperature of a printing medium 110 is sufficiently decreased by stopping the printing medium 110 in a discharge path, conveying the printing medium at a low speed, switching a conveyance path, or the like. If the temperature of the printing medium 110 can be sufficiently decreased, the thermochromism phenomenon is suppressed. As a result, it is possible to provide an image forming apparatus capable of achieving highly accurate color matching and color stability.

Abstract: An image forming apparatus including: a toner image forming unit forming a toner image on an intermediate transfer member; a transfer member transferring the toner image on the intermediate transfer member to a recording material in a transfer portion; a driving source applying driving force to the transfer member independently of an intermediate transfer member driving source; an execution unit correcting image misalignment on the basis of a detection result of a test toner image on the intermediate transfer member when no toner image exists in the transfer portion; a container storing the recording material; and an input unit associating the container with a group related to basic weight and surface properties of the recording material. The apparatus includes a driving unit driving the driving source at a speed corresponding to the group if the recording material stored in the container associated with the group is used for image formation.

Abstract: An image forming apparatus forms a measurement image on a sheet, moves a carriage to read the measurement image, reads from a storage unit an adjustment condition, generates a correction condition based on the adjustment condition and a result of reading the measurement image, moves the carriage to read an original, generates image data of the original, corrects a position at which an image is formed on a sheet based on the correction condition and forms an image of the original on a sheet based on the corrected image data.

Abstract: Temperature of a printing medium 110 is sufficiently decreased by stopping the printing medium 110 in a discharge path, conveying the printing medium at a low speed, switching a conveyance path, or the like. If the temperature of the printing medium 110 can be sufficiently decreased, the thermochromism phenomenon is suppressed. As a result, it is possible to provide an image forming apparatus capable of achieving highly accurate color matching and color stability.

Abstract: An image forming apparatus including: a toner image forming unit forming a toner image on an intermediate transfer member; a transfer member transferring the toner image on the intermediate transfer member to a recording material in a transfer portion; a driving source applying driving force to the transfer member independently of an intermediate transfer member driving source; an execution unit correcting image misalignment on the basis of a detection result of a test toner image on the intermediate transfer member when no toner image exists in the transfer portion; a container storing the recording material; and an input unit associating the container with a group related to basic weight and surface properties of the recording material. The apparatus includes a driving unit driving the driving source at a speed corresponding to the group if the recording material stored in the container associated with the group is used for image formation.