Abstract: According to one embodiment, a belt positioning structure includes a belt roller around which an endless belt is wound. The belt comprises a belt-side positioning component curbing position aberration from the belt roller in a roller shaft direction. The belt roller comprises a roller-side positioning component curbing position aberration of the belt in a belt shaft direction. The roller-side positioning component comprises a regulation plate formed along a virtual tapered surface that has a diameter on one side in the roller shaft direction larger than a diameter on an opposite side of the regulation plate. The regulation plate comprises a movement regulation component that regulates movement of the belt-side positioning component to the one side of the belt-side positioning component in the roller shaft direction and strengthens a movement regulation force to the one side of the belt-side positioning component in the roller shaft direction.

Abstract: According to one embodiment, there is provided a belt positioning structure including a belt roller, a belt, a projection, and a first rotating body. The belt roller is rotatable about a roller axis. The belt is wound around the belt roller. The projection is provided so as to protrude from an inner peripheral surface of the belt. The first rotating body regulates the projection from moving in a first direction approaching the belt roller along the roller axis. The first rotating body is rotatable around an axis. At least a portion of an outer peripheral surface of the first rotating body faces a side surface of the projection on the first direction side.

Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.

Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.

Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.

Abstract: Certain embodiments provide a transfer apparatus, which including: an conductive intermediate transfer member; a transfer section configured to secondarily transfer a toner image onto an image receiving medium in a constant current system; a conveyance section configured to convey the image receiving medium; and a high voltage transformer configured to apply a bias to the transfer member, wherein the sum of the products of the volume resistivities [?·cm] and the thicknesses [cm] of the intermediate transfer member and the transfer member is equal to or greater than 3.6×108 ?·cm2, and the conveyance speed V[mm/s] of the image receiving medium={the output upper limit value A[V] of the absolute value of the voltage output from the transfer polarity side of the high voltage transformer}×0.009.

Abstract: In accordance with an embodiment, the marking apparatus comprises a marking section configured to print, with a color erasable material, a mark in the margin area of a sheet and a marking control section configured to overprint, using the marking section, a mark at a specific position of the sheet every time an image is formed in the image printing area of the sheet with a color erasable material.

Abstract: In accordance with an embodiment, the marking apparatus comprises a marking section configured to print, with a color erasable material, a mark in the margin area of a sheet and a marking control section configured to overprint, using the marking section, a mark at a specific position of the sheet every time an image is formed in the image printing area of the sheet with a color erasable material.

Abstract: In accordance with an embodiment, the marking apparatus comprises a marking section configured to print, with a color erasable material, a mark in the margin area of a sheet and a marking control section configured to overprint, using the marking section, a mark at a specific position of the sheet every time an image is formed in the image printing area of the sheet with a color erasable material.

Abstract: In accordance with an embodiment, the marking apparatus comprises a marking section configured to print, with a color erasable material, a mark in the margin area of a sheet and a marking control section configured to overprint, using the marking section, a mark at a specific position of the sheet every time an image is formed in the image printing area of the sheet with a color erasable material.

Abstract: An image forming apparatus configured to form an image on a transfer medium with a developer includes: an image bearing member on which an electrostatic latent image is formed, the developer is supplied to develop the electrostatic latent image, and an image to be transferred onto the transfer medium is formed, the image bearing member having surface hardness of 150 N/mm to 220 N/mm in a universal hardness value (HU); a developing device configured to supply the developer to the image bearing member; a cleaner configured to be brought into press-contact with the image bearing member at press-contact linear pressure x in a range of 16.7?x?22.0 [mN/mm]) and collect components of the developer remaining on the image bearing member after the image is transferred onto the transfer medium; and a lubricant containing fatty acid metal salt arranged at a distal end of the cleaner being in contact with the image bearing member, at an arrangement amount y in a range of 25?y?100 [ng/mm] to satisfy a condition y?12.

Abstract: A cleaning device comprises a device case having a toner collecting space, a blade holder swingably supported in directions in which the blade holder approaches and leaves from the photosensitive drum, an elastic seal member attached to one of a wall of the toner collecting space and the blade holder, between an outer face of the wall forming the toner collecting space and the blade holder, in order to be forcibly brought into contact with one of the wall forming the toner collecting space and the blade holder, wherein the blade holder or the wall forming the toner collecting space has a protrusion that is at least partly welded into the elastic seal member, and is forcibly brought into contact with the elastic seal member.

Abstract: A cleaning device comprises a device case having a toner collecting space, a blade holder swingably supported in directions in which the blade holder approaches and leaves from the photosensitive drum, an elastic seal member attached to one of a wall of the toner collecting space and the blade holder, between an outer face of the wall forming the toner collecting space and the blade holder, in order to be forcibly brought into contact with one of the wall forming the toner collecting space and the blade holder, wherein the blade holder or the wall forming the toner collecting space the blade holder has a protrusion for wedging to a part of a surface of the elastic seal member, and is forcibly brought into contact with the elastic seal member.