An image forming apparatus includes a sheet stacking portion, an image forming portion, a detection portion configured to detect a position, in a sheet width direction, a storage configured to store position information of a sheet, and a controller. The controller is configured to cause the storage to store the position information based on a position of a sheet detected by the detection portion during execution of the job, and if sheet information of a sheet used in a previous job is matches sheet information of a sheet used in a current job, cause the image forming portion to start formation of an image to be formed on a first sheet, before a position of the first sheet is detected by the detection portion, based on the position information stored in the storage in the previous job.

An image forming apparatus includes a belt, tension rollers, an outer member, a pressing member, a moving mechanism, and an attachable unit. The belt bears a toner image and the tension rollers stretch the belt around rollers. The toner image is transferred at the outer member from the belt onto a recording material. The moving mechanism moves the pressing member to press an inner surface of the belt toward an outer surface side. The attachable unit includes the pressing member or the belt and attaches to and detaches from the image forming apparatus. A mode is executed in which the pressing member presses the belt to transfer the toner image onto the recording material. Information is stored based on an individual difference of the attachable unit related to a setting of a moving mechanism position in executing the mode, where the setting is based on the stored information.

An image forming apparatus includes an image bearing member, an intermediary transfer belt, a transfer member, a voltage source for applying a voltage to the transfer member, a detecting portion for detecting a current flowing through the transfer member, and a controller for carrying out constant-voltage control so that the voltage applied to the transfer member becomes a target voltage when a recording material P passes through a transfer portion. The controller is capable of changing the voltage applied to the transfer member so that a detection result detected by the detecting portion during transfer falls within a predetermined range. The controller changes the predetermined range on the basis of the detection result detected by the detecting portion when the voltage is applied to the transfer member in a state in which the recording material P is absent in the transfer portion.

An image forming apparatus includes an image bearing member, an intermediary transfer belt, a transfer member, a voltage source for applying a voltage to the transfer member, a detecting portion for detecting a current flowing through the transfer member, and a controller for carrying out constant-voltage control so that the voltage applied to the transfer member becomes a target voltage when a recording material P passes through a transfer portion. The controller is capable of changing the voltage applied to the transfer member so that a detection result detected by the detecting portion during transfer falls within a predetermined range. The controller changes the predetermined range on the basis of the detection result detected by the detecting portion when the voltage is applied to the transfer member in a state in which the recording material P is absent in the transfer portion.

A fixing device includes: a non-contact heating unit configured to heat a recording medium in a non-contact manner; and a contact heating unit configured to press and heat the recording medium on a downstream side of the non-contact heating unit in a conveyance direction of the recording medium, in which the non-contact heating unit controls an amount of heat applied to the recording medium according to information on whether the recording medium is black or not, and a thickness of the recording medium, and the contact heating unit controls the pressure applied to the recording medium according to the thickness regardless of whether the recording medium is black or not.

A printing apparatus capable of conveying sheets to a sheet processing apparatus and to control the type of a sheet to be used as a cover sheet in a case where a book bound product is generated by switching back sheets each having an image printed, inverting the sheets and folding the inverted sheets, and to notify an error to a user based on the type of a sheet to be used as the cover sheet in a case where printing an image on the cover sheet is designated.

A printing apparatus capable of conveying sheets to a sheet processing apparatus and to control the type of a sheet to be used as a cover sheet in a case where a book bound product is generated by switching back sheets each having an image printed, inverting the sheets and folding the inverted sheets, and to notify an error to a user based on the type of a sheet to be used as the cover sheet in a case where printing an image on the cover sheet is designated.

A transfer device includes a rotatable image bearer configured to bear a toner image to be transferred to a recording medium, a first rotator, and a second rotator. The second rotator is configured to contact the first rotator via the rotatable image bearer to form a transfer nip in which the recording medium is sandwiched. The second rotator is rotatable with the image bearer. The transfer device satisfies a conditional expression (t1+R)/(t2+R)>0.98, where t1 represents a thickness of a thinnest recording medium, t2 represents a thickness of a thickest recording medium, and R represents a radius of curvature of the transfer nip.

An image forming apparatus includes: a sheet feeding tray that stores a sheet; a sheet thickness measurement device that measures a sheet thickness of the sheet fed from the sheet feeding tray; a hardware processor that: determines a type of the sheet of which the sheet thickness is measured, a sheet type associated with each of sheet thickness ranges, and the sheet thickness measured by the sheet thickness measurement device; and adjusts a first sheet thickness range to cause the first sheet thickness range to be expandable to at least one of an upper limit value side or a lower limit value side; and an image former that forms an image on the sheet fed from the sheet feeding tray under image forming conditions corresponding to the sheet type determined by the hardware processor.

According to one embodiment, a paper feeding device includes a containing unit, a conveyance unit, a heater, a wiring, a thermostat, and a switch. The containing unit contains a sheet bundle. The conveyance unit conveys sheets from the sheet bundle contained in the containing unit one sheet by one. The heater heats the sheet bundle contained in the containing unit. The wiring supplies electric power to the heater. The thermostat controls a driving state of the heater. The switch is inserted in a middle of wiring and switches an ON state and an OFF state of the wiring in response to an input control signal.