In accordance with one embodiment, a color erasing apparatus comprises a conveyance path, a color erasing section and a control section. The conveyance path conveys a sheet. The color erasing section erases the color of an image formed with color erasable recording agent serving as recording agent containing coloring agent the color of which can be erased by heating. The control section carries out a control, in a case where the image formed on the sheet is not an image formed with the color erasable recording agent, so that the sheet is not subjected to a color erasing processing by the color erasing section.

An image forming apparatus includes a transfer portion configured to transfer a toner image onto the sheet, a fixing unit configured to fix the toner image transferred by the transfer portion on the sheet, a detection unit arranged between the transfer portion and the fixing unit in a sheet conveyance direction and configured to detect a bending amount of the sheet nipped by the transfer portion and the fixing unit, and a control unit configured to control a conveyance speed of the sheet conveyed by the fixing unit based on a detection result of the detection unit. The detection unit includes a pivot portion configured to pivot when pressed by the sheet nipped by the transfer portion and the fixing unit, and a rotary encoder configured to output a pulse signal in accordance with a pivot amount of the pivot portion.

An image forming apparatus includes a transfer unit configured to transfer a toner image on the sheet, a fixing unit configured to fix the toner image transferred by the transfer unit to the sheet, a detection unit configured to detect the amount of deflection, and a control unit configured to control a speed of conveyance of the sheet based on a detection result from the detection unit, wherein the detection unit includes, a first pivoting member configured to be pivoted about a first pivot shaft in a first pivoting direction by the sheet pressing the first pivoting member, a second pivoting member configured to be pivoted about a second pivot shaft that is different from the first pivot shaft in a second pivoting direction by the first pivoting member pressing the second pivoting member, and a sensor configured to detect a pivotal movement of the second pivoting member.

Provided is an image forming apparatus including: a transfer portion; a fixing portion; a detection unit that is capable of detecting a deflection amount of the recording material; and a controller configured to control a conveying speed of the fixing portion, wherein the detection unit has a contact portion and a detection portion, wherein the contact portion is movable to a first position and a second position, wherein the controller moves the contact portion from the second position by outputting the signal for setting the conveying speed to a second speed larger than the conveying speed o when the contact portion is located at the second position, and wherein the controller determines an abnormal state when the contact portion is located at the second position and an output time of the signal is longer than or equal to a predetermined time.

An image-forming apparatus includes a housing, a cartridge, and a fixing device. The fixing device includes a heating member, a fixing frame, and a shutter movable between an open position for opening an opening of the fixing frame and a closed position for closing the opening. The housing includes: a guide frame for guiding a guide protrusion of the cartridge for attachment of the cartridge to the housing; and a connection link connected to the shutter and positioned opposite the cartridge with respect to the guide frame. The connection link moves the shutter to the open position in conjunction with the attachment of the cartridge to the housing, and moves the shutter to the closed position in conjunction with detachment of the cartridge from the housing. The connection link abuts on the guide protrusion through a through-hole of the guide frame during the attachment of the cartridge to the housing.

An image forming apparatus includes a transfer unit, a fixing unit, a conveyance unit, and a control unit. The control unit selectively performs a plurality of modes including a first mode and a second mode. The first mode is a mode in which, when a grammage of a sheet is a first grammage, if a leading edge of the sheet has reached the fixing unit, the control unit controls the first suction unit such that suction force of the first suction unit becomes first suction force. The second mode is a mode in which, when the grammage of the sheet is a second grammage smaller than the first grammage, if a leading edge of the sheet has reached the fixing unit, the control unit controls the first suction unit such that the suction force of the first suction unit becomes second suction force smaller than the first suction force.

An image forming apparatus includes a fixing portion including a fixing nip for fixing a toner image on a sheet. A controller executes image formation on a first sheet and a second sheet of which size in a widthwise direction is larger than that of the first sheet. The controller changes a time from when a trailing end of the sheet has passed through the fixing nip until when a following sheet reaches the fixing nip. When a width of the toner image to be formed on the sheet in the widthwise direction is defined as an image area width, the controller controls so that the time when the width of the first sheet is equal to or longer than the image area width of the second sheet is shorter than the time when the width of the first sheet is shorter than the image area width.

An image forming apparatus includes a transfer portion, a fixing portion, a detection unit configured to detect a bending amount of the sheet nipped between the transfer portion and the fixing portion, and a control unit. The detection unit includes a rotation portion configured to rotate in a rotation direction from a standby position by being pressed by the sheet nipped by the transfer portion and the fixing portion, a rotary encoder configured to output a pulse signal corresponding to a rotation amount of the rotation portion, and a rotation detector configured to detect that the rotation portion has reached a detection position downstream of the standby position in the rotation direction. The control unit controls a sheet conveyance speed of the fixing portion based on the pulse signal output from the rotary encoder after the rotation detector detects that the rotation portion has reached the detection position.

An image forming apparatus includes: a drum unit; a fixing unit including a fixing member and a pressing member; a fixing pressure release unit disposed below the fixing unit; a body frame including a lateral support plate and a partition plate; a cooling fan; a first cooling duct; and a shifting mechanism. The first cooling duct is provided on an outside of the lateral support plate. The lateral support plate is provided with an air outlet. The fixing pressure release unit includes a nip pressure adjustment gear and a rotary gear. The fixing unit performs a switching behavior of switching a state of the fixing member and the pressing member between a pressed state and a released state by a rotary drive force supplied from the rotary gear to the nip pressure adjustment gear. The shifting mechanism shifts the fixing unit vertically upward in conjunction with the switching behavior.

A movable chute is located downstream of a transfer unit and upstream of a fuser in a first direction. A downstream end of the movable chute located at a second position is farther from a sheet conveyance path than the downstream end of the movable chute located at a first position. A reconveyance chute forms a reconveyance path of a sheet that is reconveyed from the fuser toward the transfer unit. The reconveyance path is located between the movable chute and the reconveyance chute in a sheet thickness direction. The movable chute has a sheet conveyance surface and a first reconveyance surface. The sheet conveyance surface guides the sheet that is conveyed from the transfer unit toward the fuser along the sheet conveyance path. The first reconveyance surface faces opposite to the sheet conveyance surface in the sheet thickness direction. The first reconveyance surface forms the reconveyance path.