The curl correction device includes a first guide that guides a sheet to a nip portion between a first rotation member and a second rotation member, a support portion that rotatably supports the first guide about a fulcrum on the downstream side of the first guide, and a restriction portion that restricts a rotation of the first guide rotating about the fulcrum by being in contact with the first guide. The first guide is rotatable about the fulcrum so as to become separated from the restriction portion.

An image forming apparatus includes a transfer unit and a static eliminating unit. The transfer unit transfers a toner image formed on an image holding body to a recording medium. The static eliminating unit is disposed downstream of the transfer unit in a transport direction in which the recording medium is transported, stores electric charge while the recording medium is passing through a recording medium transfer region, and releases the electric charge when a leading edge of the recording medium enters the recording medium transfer region.

An image forming apparatus includes an image forming section and a transfer section. The image forming section includes a first image forming unit that forms a first developer image and a second image forming unit that forms a second developer image. The transfer section transfers, on a basis of a first transfer condition, the first developer image onto a medium, and transfers, on a basis of a second transfer condition, the second developer image onto the medium onto which the first developer image has been transferred. The second transfer condition is different from the first transfer condition.

An image forming apparatus includes a transfer unit and a static eliminating unit. The transfer unit transfers a toner image formed on an image holding body to a recording medium. The static eliminating unit is disposed downstream of the transfer unit in a transport direction in which the recording medium is transported, stores electric charge while the recording medium is passing through a recording medium transfer region, and releases the electric charge when a leading edge of the recording medium enters the recording medium transfer region.

In an image forming apparatus configured such that developer remaining on an image bearing member without being transferred to a recording material is moved from the image bearing member to a developer bearing member and then recovered in a developer storage portion 35. When forming a second image on a rear surface of the recording material having a surface on which a first image is fixed with a fixing device, a second potential difference between surface potential of the image bearing member after charging with a charging member when forming the second image and potential of the developer bearing member is less than a first potential difference when forming a first image.

An image forming apparatus includes a process unit configured to form a toner image on a sheet, a fuser configured to heat the sheet passed through the process unit thereby fixing the toner image onto the sheet, a re-conveyor configured to convey the sheet passed through the fuser to the process unit, and a controller configured to perform particular duplex printing including controlling, when a temperature of the fuser is a first temperature, the re-conveyor to convey the sheet passed through the fuser to the process unit in a first period of time, and controlling, when the temperature of the fuser is a second temperature higher than the first temperature, the re-conveyor to convey the sheet passed through the fuser to the process unit in a second period of time longer than the first period of time.

To provide an image forming apparatus in which the paper is cooled early by blowing air to the paper in the conveying path so as to prevent a sticking phenomenon on a paper output tray while paper turning, paper folding, paper breakage and paper jamming due to influence on paper conveyance by blowing air onto the paper in the conveying path, can be prevented. At the start of paper conveyance, a gate 73 is turned upwards to a first position to thereby close a sixth conveying path 44 and establish communication between a first conveying path 42 and a second conveying path 43 so that the paper having passed through a fixing unit 21 starts to be conveyed from first conveying path 42 to second conveying path 43. At the same time, air is exhausted from an exhausting mechanism 53 arranged upstream of a cooling mechanism 76. When a first paper sensor 74 detects the leading end of the paper, a cooling fan 77 starts to rotate at a predetermined rotational rate to start blowing air at a predetermined volume of cooling airflow.

An image forming apparatus includes an image forming unit, a display, a reading unit configured to read a reference image formed on a test sheet by the image forming unit, wherein the reference image includes a mark corresponding to a reading order, a controller configured to control the image forming unit to form the reference image, cause the reading unit to execute a first reading operation, determine whether first read data is obtained, inform of a reading error if the first read data is not obtained in the first reading operation, cause the reading unit to execute a second reading operation, determine whether second read data is obtained, and inform of a reading error if the second read data is not obtained in the second reading operation, and an adjustment unit configured to adjust image forming positions based on the first read data and the second read data.

An image forming device, includes: a transfer unit that transfers a toner image onto a recording medium being conveyed; a main heating unit that is disposed at a downstream side of the transfer unit in a conveyance direction of the recording medium, heats the recording medium in contact with the recording medium, and fixes the toner image to the recording medium; a reversing unit that reverses front and back of the recording medium having the toner image fixed on a first surface of the recording medium by the main heating unit, and sends the recording medium to the transfer unit; a preheating unit that is arranged between the transfer unit and the main heating unit in the conveyance direction of the recording medium and heats the recording medium in a non-contact state, the preheating unit being configured to heat the recording medium so that, when the recording medium that is sent to the transfer unit by the reversing unit and on which the toner image is transferred to a second surface is heated, a temperature of the first surface of the recording medium is higher than a softening point of a toner before the recording medium is heated by the main heating unit; and a non-contact unit that brings a toner image forming region on the first surface of the recording medium on which the toner image is transferred onto the second surface and a member other than the recording medium between the preheating unit and the main heating unit in a non-contact state.

In an image forming apparatus configured such that a developer remaining on an image bearing member 1 without being transferred to a recording material P is moved from the image bearing member to a developer bearing member 31 and then recovered in a developer storage portion 35, when forming a second image on a rear face of the recording material P having a surface on which a first image is fixed with a fixing device 6, a second potential difference between surface potential of the image bearing member 1 after charging with a charging member 2 when forming the second image and potential of the developer bearing member 31 is less than a first potential difference when forming a first image.