In an example, a method of controlling voltage applied to a print blanket within a printing device includes printing a print job. During the printing, a null cycle trigger is received. In response to the trigger, a print blanket bias voltage is reduced from a print bias level to a null bias level.

An image forming apparatus includes: an acquisition portion that acquires, based on a current value detected by a detection unit, a discharge start voltage value between a photosensitive body and a charging member, in a voltage value of a voltage applied to the charging member, the discharge start voltage value being acquired from at least one of a plurality of measurement regions set by dividing an image forming region of the photosensitive body, in which an electrostatic image is formed, into a plurality of regions in a longitudinal direction orthogonal to a recording material conveyance direction; and a control portion that performs unevenness suppression control to reduce unevenness, in the longitudinal direction, of density of a developer image transferred onto the recording material based on the discharge start voltage value.

In one implementation, an image forming apparatus may include a photoconductive unit and a refresh unit. The photoconductive unit may include a photoconductive layer. The photoconductive layer may have a first polarity during a print routine. The refresh unit may apply a voltage to the photoconductive layer to electrically bias the photoconductive layer to have a second polarity during a refresh routine.

An image forming apparatus includes: an image forming unit that transfers a toner image onto a recording medium, the toner image being formed on an image carrier by an electrophotographic system; and one or more processors that control an operation of the image forming unit, and that are configured to: perform multiple operations under different conditions about charging and exposure to light in predetermined order, the operations including at least an operation of forming a toner image on the recording medium with the image carrier having been subjected to charging and exposure to light and an operation of forming a toner image on the recording medium with the image carrier having been subjected to no exposure to light and optionally to charging; and control the image forming unit to form margins of different forms, the margins being formed on pieces of the recording medium in the respective operations performed under the different conditions.

In the case where development is performed by a two-component developing method, a previous charge removal light-emitting portion applies charge removal light to a first charge removal target region of an effective outer circumferential surface of a photosensitive member on which effective outer circumferential surface an electrostatic latent image can be formed. The first charge removal target region includes a part of a magnetic brush contact region of the effective outer circumferential surface and a region of the effective outer circumferential surface between the magnetic brush contact region and a transfer position of a toner image.

An image forming apparatus includes an image bearing member, a charging member, a development member, a developer accommodating portion, a first acquiring portion which acquires developer amount information related to an amount of the developer accommodated in the developer accommodating portion, a second acquiring portion which acquires development drive information related to a movement distance of a surface of the development member, and a control portion which is capable of executing a first mode and a second mode, whose frequency of driving the development member lower than that of the first mode, as an image forming mode. The control portion proposes or determines a change from the first mode to the second mode of the image forming mode on the basis of the developer amount information and the development drive information.

An image forming apparatus includes an apparatus main body and a drum unit. The apparatus main body has an opening and a drum unit storage part communicating with the opening. The drum unit is detachably attached to the drum unit storage part through the opening. The drum unit includes photosensitive drum, a corona discharging device and a drum cover. The corona discharging device corona-charges the photosensitive drum. The drum cover is turnable in a protective posture for covering the photosensitive drum and an exposure posture for exposing the photosensitive drum. When the drum unit is attached to the drum unit storage part, the drum cover is turned from the protective posture into the expose posture to block a flow path communicating a space around the corona charging device with an outside of the apparatus main body.