An embodiment provides an image forming apparatus that has a first operation mode and a second operation mode. The first operation mode forms an image on a sheet with toner. The second operation mode decolorizes the toner on the sheet on which the image is formed with a decolorable toner having a decoloring function. In the first operation mode, when the sheet passes through a transfer unit, a transfer bias having the same polarity as that of a charge of the toner is applied to the transfer member and a toner image formed on a surface of the transfer member is transferred to the sheet. In the second operation mode, when the sheet passes through the transfer unit, a cleaning bias having a reverse polarity to that of the transfer bias is applied to the transfer member.

An image forming apparatus includes: an attachment table to which an object is attached; a transfer unit that transfers an image onto the object; and a transport unit that transports the attachment table along a transport path that has a transport start position on one side relative to the transfer unit and has a transport end position on a same side as the transport start position relative to the transfer unit, the transport path extending beyond the transfer unit and the attachment table being transported so as to turn back at a position beyond the transfer unit.

An image forming apparatus includes: a casing, a first process cartridge including a first photosensitive drum and a first drum-cleaning unit configured to collect waste toner on the first photosensitive drum, a second process cartridge including a second photosensitive drum and a second drum-cleaning unit configured to collect waste toner on the second photosensitive drum, a cartridge-supporting body movable between an internal position inside the casing and an external position outside of the casing, a conveying unit conveying the waste toner collected by the first and second drum-cleaning units, and a waste toner cartridge accommodating the conveyed waste toner. The casing includes a first positioning plate receiving one end portion of the first and second process cartridges, and a second positioning plate receiving another end portion of the first and second process cartridges. The conveying unit is disposed between the first positioning plate and the second positioning plate.

Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan of a test piece sampled from the elastic member is measured in the temperature range of 20 C. to +60 C., the peak temperature of a peak indicating the maximum value of tan is at 15.0 C. or below; the maximum value of tan is 0.20 to 0.55; tan at a temperature of 55 C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10 C./second to 1000 C. using a direct-sampling mass spectrometer is M1 and the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M2, M2/M1 is at least 0.001.

An image forming apparatus includes: a casing, a first process cartridge including a first photosensitive drum and a first drum-cleaning unit configured to collect waste toner on the first photosensitive drum, a second process cartridge including a second photosensitive drum and a second drum-cleaning unit configured to collect waste toner on the second photosensitive drum, a cartridge-supporting body movable between an internal position inside the casing and an external position outside of the casing, a conveying unit conveying the waste toner collected by the first and second drum-cleaning units, and a waste toner cartridge accommodating the conveyed waste toner. The casing includes a first positioning plate receiving one end portion of the first and second process cartridges, and a second positioning plate receiving another end portion of the first and second process cartridges. The conveying unit is disposed between the first positioning plate and the second positioning plate.

An image forming apparatus includes a main frame, a plurality of process cartridges, a cartridge-supporting body, a belt, a belt cleaning unit, a waste toner cartridge, and a collective conveying unit. Each drum-cleaning unit collects waste toner on a corresponding photosensitive drum. The cartridge-supporting body supports the process cartridges and is movable between an internal position inside the main frame and an external position outside of the main frame. The belt cleaning unit collects waste toner on the belt. The waste toner cartridge accommodates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit. The collective conveying unit aggregates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit and conveys the aggregated waste toner to the waste toner cartridge.

An image forming apparatus includes a main frame, a plurality of process cartridges, a cartridge-supporting body, a belt, a belt cleaning unit, a waste toner cartridge, and a collective conveying unit. Each drum-cleaning unit collects waste toner on a corresponding photosensitive drum. The cartridge-supporting body supports the process cartridges and is movable between an internal position inside the main frame and an external position outside of the main frame. The belt cleaning unit collects waste toner on the belt. The waste toner cartridge accommodates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit. The collective conveying unit aggregates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit and conveys the aggregated waste toner to the waste toner cartridge.

A roller cleaning mechanism includes a cleaning member making contact with a conveying roller, a holder holding the cleaning member, a housing for the holder, and an urging member. The holder is supported on the housing swingably about a swing shaft parallel to the axial direction of a driving roller. The urging member urges the holder oppositely to the rotation direction of the conveying roller. When the conveying roller rotates, its rotative driving force keeps the holder at a cleaning position where a cleaning face of the cleaning member makes contact with the outer circumferential face of the conveying roller. When the conveying roller is halted, the urging force of the urging member keeps the holder at a retracted position where a part of the cleaning member different from the cleaning face makes contact with the outer circumferential face of the conveying roller.

An image forming apparatus includes a main frame, a plurality of process cartridges, a cartridge-supporting body, a belt, a belt cleaning unit, a waste toner cartridge, and a collective conveying unit. Each drum-cleaning unit collects waste toner on a corresponding photosensitive drum. The cartridge-supporting body supports the process cartridges and is movable between an internal position inside the main frame and an external position outside of the main frame. The belt cleaning unit collects waste toner on the belt. The waste toner cartridge accommodates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit. The collective conveying unit aggregates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit and conveys the aggregated waste toner to the waste toner cartridge.

A capturing rotation member captures an object on a surface by static electricity. A charging rotation member rotates while contacting with the capturing rotation member and triboelectrically charges a surface of the capturing rotation member. A collecting rotation member rotates while contacting with the capturing rotation member and collects the object adhering to the surface of the capturing rotation member. The capturing rotation member and the charging rotation member rotate in the same direction. The capturing rotation member and the collecting rotation member rotate in opposite directions.