An image forming device includes an image carrier, a transfer member, a fixing device, a conveyance member, and a controller. The transfer member forms a transfer nip that transfers an image carried on the image carrier to a recording medium. The fixing device fixes the image on the recording medium. The conveyance member is located downstream of the transfer member in a conveyance direction of the recording medium and feeds the recording medium to the fixing device. The controller variably controls position of the conveyance member.

An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.

An image forming apparatus 100, employs a constitution in which in a case that a relative position between an inner roller 32 and an outer member 41 with respect to a circumferential direction of the inner roller 32 is changed in a period after a preceding recording material S passed through a transfer portion N2 and until the recording material S subsequent to the preceding recording material S reaches the transfer portion N2 device execution of a job for forming and outputting images on a plurality of recording materials S, a controller 150 controls a position changing mechanism 1 so that the above-described relative position is changed in a state in which the outer member 41 contacts the intermediary transfer belt 31.

An image forming apparatus 100 employs a constitution in which in a case that a relative position between an inner roller 32 and an outer member 41 with respect to a circumferential direction of the inner roller 32 is changed in a period after a preceding recording material S passes through a transfer portion N2 and until a recording material S subsequent to the preceding recording material S reaches the transfer portion N2 during execution of a job for forming and outputting images on a plurality of recording materials S, a controller 150 controls a position changing mechanism 1 and a contact and separation mechanism 2 so that a separating operation for separating the outer roller 41 from the belt 31 and then the above-described relative position is changed.

In an image forming apparatus 100, in a case that a relative position between an inner roller 32 and an outer member 41 with respect to a circumferential direction of the inner roller 32 is changed in a period from a state in which the outer member 41 is separated from a belt 31 until first transfer in a job for forming and outputting an image on a recording material S is started when the job is executed, said controller 150 controls a position changing mechanism 1 and a contact and separation mechanism 2 so that a contact operation for bringing the outer member 41 into contact with the belt 31 after changing the relative position.

A drum member includes: a substantially cylindrical drum body having a hollow part extending in an axial direction; a sheet member wound on the drum body; an adjusting mechanism configured to adjust tension in the sheet member, the adjusting mechanism including a moving member that holds an end of the sheet member in a circumferential direction and moves in a depth direction of the hollow part, and a fixing member that fixes the moving member to the drum body; and one or more positioning members that position the moving member such that the moving member does not move in the circumferential direction of the drum body when the moving member is fixed with the fixing member.

An image forming apparatus includes an image-carrying component configured to carry a colorant image including an adjustment image, a transferring component having a recess in an outer peripheral surface and configured to transfer the colorant image from the image-carrying component to a recording medium in a transfer area while rotating in such a manner as to allow a retainer that is retaining the recording medium to pass through the recess, a transporting component configured to cause the recording medium retained by the retainer to pass through the transfer area, and a shielding component configured to shield the recess of the transferring component from colorant particles composing the colorant image.

An image forming apparatus includes an image forming portion, a transfer portion, a power source, a reading portion, and a controller. The controller executes an output operation so that first test images do not overlap with second test images, respectively, on a first side and a second side of a recording material. On the basis of information on the second test voltage for transfer of the second test image, of the plurality of second test images, of which information on a density read by the reading portion coincides with a preset condition, the controller sets a transfer voltage for image transfer onto the second side in double-side image formation so that an absolute value of the transfer voltage set for the image transfer onto the second side in the double-side image formation is larger than an absolute value of the second test voltage coincided with the preset condition.

An image forming apparatus includes a plurality of image bearers, a plurality of rotation reference position detectors, and circuitry. Each of the plurality of rotation reference position detectors faces a corresponding image bearer of the plurality of image bearers to detect a rotation reference position of the corresponding image bearer. The circuitry performs, before an operation of rotating the plurality of image bearers, alignment control based on a result of detection performed by the plurality of rotation reference position detectors. The alignment control is control of driving of the plurality of image bearers to acquire a given relationship between the respective rotation reference positions of the plurality of image bearers. The circuitry determines whether to perform the alignment control based on whether the operation of rotating the plurality of image bearers is a function maintenance related operation.

Provided is an image forming apparatus including: an annular transfer belt having an outer surface on which an image is transferred; a transferring unit including a transfer cylinder having a transfer area that sandwiches a recording medium with the outer surface of the transfer belt to transfer the image from the outer surface of the transfer belt to the recording medium, and a pair of first rotating bodies disposed on both axial end sides of the transfer cylinder; a pair of circulating members each being wound around the first rotating body and being circulated by rotation of the first rotating bodies; and a holding unit attached to the circulating members, the holding unit configured to hold the recording medium, transport the recording medium with circulation of the circulating members, and pass the recording medium through the transfer area.