A sheet separation device configured to separate a two-ply sheet, in which two sheets are bonded together at a portion, includes a rotator, a nipping member disposed opposite the rotator and configured to nip the two-ply sheet with the rotator, a conveyor configured to convey the two-ply sheet between the rotator and the nipping member, and a winding member disposed adjacent to the rotator. The conveyor conveys the two-ply sheet with a bonded portion of the two-ply sheet being an upstream end or a downstream end of the two-ply sheet in a conveyance direction of the two-ply sheet. The winding member winds the two-ply sheet around the rotator, to create a difference in winding circumferential length between the two sheets and separate the two sheets. The sheet separation device further includes control circuitry configured to adjust a winding amount of the two-ply sheet around the rotator.

An image forming method for an image forming apparatus having a fixing rotator and a pressure rotator opposite the fixing rotator includes transferring white toner and color toner onto a surface of a metallic sheet having a thermal conductivity of 0.34 W/m.Math.K or less as measured by hot-wire method to form an unfixed color toner layer layered on an unfixed white toner layer on the metallic sheet and conveying the metallic sheet, with the surface on which the white toner layer and the color toner layer are transferred facing the fixing rotator, between the fixing rotator heated and the pressure rotator to fix the white toner layer and the color toner layer onto the metallic sheet.

An image forming apparatus includes: an image carrier; a toner image forming unit that forms a toner image on the image carrier; a transfer unit that transfers the toner image on the image carrier to a transfer target having ridges and valleys on a surface thereof; an adjusting unit that adjusts a ratio of A/B, where A is a transfer ratio [%] from the image carrier to a valley portion of the transfer target while B is a transfer ratio [%] from the image carrier to a ridge portion of the transfer target, based on an adjustment input by a user; and a control unit that controls a transfer condition of the transfer unit based on the ratio of A/B adjusted by the adjusting unit.

An image forming apparatus comprises a container, a supplier, a conveyor, a grammage detector, a sheet detector, an image former, and a processor. The processor sets a flag when the detected grammage exceeds a first grammage, measures a conveyance time of a sheet to the sheet detector, determines a conveyance delay of the sheet based on whether the conveyance time is greater than or equal to a first amount of time, counts a number of occurrences of the conveyance delay in a state where the detected grammage exceeds the first grammage, and prohibits supply of sheets from the container when the detected grammage exceeds a second grammage larger than the first grammage or the number of occurrences of the conveyance delay is greater than or equal to a threshold value.

An image forming apparatus includes a first toner image forming unit, a second toner image forming unit, and a transfer section. The first toner image forming unit forms a first toner image with use of a first toner. The first toner has a complex viscosity that falls within a range from 625 Pascal-seconds to 3860 Pascal-seconds, both inclusive, at a temperature of 100 degrees centigrade. The second toner image forming unit forms a second toner image with use of a second toner. The transfer section transfers the first toner image onto a print medium, and transfers the second toner image onto the print medium in a region that overlaps a portion or all of a region where the first toner image has been transferred. The print medium includes a polymer compound.

A sheet processing apparatus includes circuitry configured to acquire a size of a two-ply sheet, in which two sheets are bonded together at one end, and a size of an insertion sheet; and control a sheet processing operation based on the size of the two-ply sheet and the size of the insertion sheet. The sheet processing operation includes inserting the insertion sheet in the two-ply sheet.

In accordance with an embodiment, an image forming apparatus comprises a fixing section, a sheet housing section, and a sheet passing controller. The fixing section fixes a developer by heating a label paper onto which the developer is transferred. The sheet housing section houses a cleaning sheet from which adhesive leaking out from the label paper and adhering to the fixing section is removed. The sheet passing controller conveys the cleaning sheet from the sheet housing section to the fixing section.

An image formation apparatus includes: a fixing belt wound on a plurality of support rollers including a first pressure applying roller; a second pressure applying roller applying a pressure to the first pressure applying roller and thus forming a nip portion N; a tension modifying mechanism adjusting a tension; a contact area adjustment mechanism adjusting a downstream contact area, which is a contact area of the fixing belt in contact with the first pressure applying roller that is located downstream of the nip portion N; a sheet information obtainer; and a controller controlling an operation of the tension modifying mechanism and an operation of the contact area adjustment mechanism. When sheet information indicates embossed paper, the controller adjusts the operation of the tension modifying mechanism and the operation of the contact area adjustment mechanism to reduce a tension exerted to the fixing belt and also reduce the downstream contact area.

In an image forming apparatus, a calculation processing portion includes an input portion and an input-portion abnormality determining portion. The input portion is connected to a temperature detection portion. When an abnormality detection circuit has detected that a temperature detected by the temperature detection portion is an abnormally heated temperature, the input-portion abnormality determining portion determines whether or not a first temperature calculated as a temperature of a fixing member is lower than a predetermined second temperature, and upon determining that the first temperature is lower than the second temperature, determines that the input portion is abnormal.

An image forming apparatus comprises a container, a supplier, a conveyor, a grammage detector, a sheet detector, an image former, and a processor. The processor set a flag when the detected grammage exceeds a first grammage, measures a conveyance time of a sheet to the sheet detector, determines a conveyance delay of the sheet based on whether the conveyance time is greater than or equal to a first amount of time, counts a number of occurrences of the conveyance delay in a state where the detected grammage exceeds the first grammage, and prohibits supply of sheets from the container when the detected grammage exceeds a second grammage larger than the first grammage or the number of occurrences of the conveyance delay is greater than or equal to a threshold value.