Abstract: A fixing device includes a first pressing member, a fixing belt, a second pressing member, a load adjustment unit, a tension adjustment unit and a control unit. The first pressing member has an elastic layer. The fixing belt is wound around the first pressing member. The second pressing member presses against the first pressing member via the fixing belt, conveys the recording member and forms a fixing nip. The load adjustment unit adjusts pressing load of the first pressing member and the second pressing member. The tension adjustment unit adjusts tension of the fixing belt. The control unit controls the load adjustment unit so as to change a width of the fixing nip in a recording member conveyance direction and controls the tension adjustment unit so as to change the tension of the fixing belt.

Abstract: The image forming system includes an unjamming execution section configured to execute unjamming for eliminating a sheet jam when the sheet jam is caused in the image forming system; and a control section configured to control the unjamming execution section to execute the unjamming in accordance with a position of the sheet jam or a portion of the long sheet causing the sheet jam, or both in the image forming system.

Abstract: A fixing device includes a first pressing member, a fixing belt, a second pressing member, a load adjustment unit, a tension adjustment unit and a control unit. The first pressing member has an elastic layer. The fixing belt is wound around the first pressing member. The second pressing member presses against the first pressing member via the fixing belt, conveys the recording member and forms a fixing nip. The load adjustment unit adjusts pressing load of the first pressing member and the second pressing member. The tension adjustment unit adjusts tension of the fixing belt. The control unit controls the load adjustment unit so as to change a width of the fixing nip in a recording member conveyance direction and controls the tension adjustment unit so as to change the tension of the fixing belt.

Abstract: Disclosed herein are a fixing device and an image forming apparatus including: a rotatable fixing side member; a rear side member that rotates in pressure contact with an outer peripheral surface of the fixing side member, the rear side member forming a fixing nip portion for conveying a sheet on which a toner image is formed in a sandwiching manner in conjunction with the fixing side member; and velocity difference setting structure for setting a velocity difference between a surface velocity of the rear side member and a surface velocity of the fixing side member, wherein the rear side member and the fixing side member rotate with a velocity difference set by the velocity difference setting structure.

Abstract: The image forming system includes an unjamming execution section configured to execute unjamming for eliminating a sheet jam when the sheet jam is caused in the image forming system; and a control section configured to control the unjamming execution section to execute the unjamming in accordance with a position of the sheet jam or a portion of the long sheet causing the sheet jam, or both in the image forming system.

Abstract: Disclosed herein are a fixing device and an image forming apparatus including: a rotatable fixing side member; a rear side member that rotates in pressure contact with an outer peripheral surface of the fixing side member, the rear side member forming a fixing nip portion for conveying a sheet on which a toner image is formed in a sandwiching manner in conjunction with the fixing side member; and velocity difference setting means for setting a velocity difference between a surface velocity of the rear side member and a surface velocity of the fixing side member, wherein the rear side member and the fixing side member rotate with a velocity difference set by the velocity difference setting means.

Abstract: A fixing device includes: a heating section; and a press section which presses the heating section and thereby forms a fixing nip section, wherein at least one of the heating section and the press section comprises, an endless fixing belt; a press member which presses the fixing belt to the fixing nip; and a sliding sheet covering the press member, wherein the sliding sheet is wider than the fixing belt; projections are provided at a first area which is inside of an end part of the press member of a surface of the sliding sheet in the width direction; and projections lower than the projections provided at the first area are provided at a second area which is near the end of the fixing belt of the surface of the sliding sheet, or projections are not provided at all at the second area.

Abstract: A fixing device includes: a heating section; and a press section which presses the heating section and thereby forms a fixing nip section, wherein at least one of the heating section and the press section comprises, an endless fixing belt; a press member which presses the fixing belt to the fixing nip; and a sliding sheet covering the press member, wherein the sliding sheet is wider than the fixing belt; projections are provided at a first area which is inside of an end part of the press member of a surface of the sliding sheet in the width direction; and projections lower than the projections provided at the first area are provided at a second area which is near the end of the fixing belt of the surface of the sliding sheet, or projections are not provided at all at the second area.

Abstract: An image forming apparatus may include a belt fixing unit and a controller. The belt fixing unit includes a moving fixing belt heated by a heater, a pressure member provided inside the fixing belt, a pressure roller provided opposite to the pressure member through the fixing belt to form a nip portion, a transfer material having a toner image thereon passing the nip portion and thereby the toner image being fixed on the transfer material, and a pressing force change unit capable of changing a pressing force of the pressure member against the pressure roller. The controller controls the pressing force change unit to change the pressing force according to print information for both faces of the transfer material.

Abstract: An image forming apparatus is provided with a fixing section, including a heating member, a pressing member, in which the heating member and the pressing member are arranged to form a nipping section therebetween, and a belt member inserted through the nipping section for fixing a toner image on a recordig sheet by conveying the recording sheet through the nipping section; and a control section for controlling the fixing section and obtaining recording sheet information with respect to at least one of a plurality of conditions. The pressig member includes a plurality of pressing heads differing in shape and with respect to at least one of a plurality of characteristics, and the control section selects one of the plurality of pressing heads in accordance with the recording sheet information and controls the fixing section to press the recording sheet through the belt member with the selected one of the plurality of pressing heads.

Abstract: An image forming apparatus comprises a belt fixing unit and a controller. The belt fixing unit includes a moving fixing belt heated by a heater, a pressure member provided inside the fixing belt, a pressure roller provided opposite to the pressure member through the fixing belt to form a nip portion, a transfer material having a toner image thereon passing the nip portion and thereby the toner image being fixed on the transfer material, and a pressing force change unit capable of changing a pressing force of the pressure member against the pressure roller. The controller controls the pressing force change unit to change the pressing force according to print information for both faces of the transfer material.

Abstract: An induction heating type of fixing device to fix a recording material having a toner image thereon, having a heating member, an induction coil divided into a plurality of parts, a temperature detector for detecting a temperature of the heating member, a signal generator for generating a switching signal that periodically controls permission and prohibition of energization of each of the divided induction coils, and a controller for controlling supply of a driving current to each of the divided induction coils to heat the heating member. The controller controls the energization by periodically switching the driving current to each of the divided induction coils on the basis of an energization signal that determines the permission and the inhibition of the driving currents according to a signal of temperature detected by the temperature detector, and the switching signal.

Abstract: An induction-heating fixing apparatus comprising: a heating member for fixing a toner image to a recording material carrying the toner image by heating the toner image; an induction-heating coil divided into a plurality of coils and comprising a first induction-heating coil and a second induction-heating coil adjacent to each other; and a power-distribution control member for controlling power distribution by supplying a driving-current to the plurality of induction-heating coils in order to heat the heating member, wherein the power-distribution control member comprises a determining section for selecting whether to supply the driving-current to the first induction-heating coil or the second induction-heating coil.

Abstract: A fixing section for use in an image forming apparatus, is provided with a heating member, a pressing member in which the heating member and the pressing member are arranged to form a nipping section therebetween and a belt member inserted through the nipping section and for fixing the toner image on the recording sheet by conveying the recording sheet through the nipping section; and a control section for obtaining recording sheet information regarding at least characteristics and a size and for controlling the fixing section. The pressing member comprises plural pressing heads differing in at least one of a physical characteristics and a shape from each others and the control section select one head of the plural pressing heads in accordance with the recording sheet information and control the fixing section to press the recording sheet through the belt member with the selected one head.

Abstract: An induction heating type of fixing device to fix a recording material having a toner image thereon, having a heating member, an induction coil divided into a plurality of parts, a temperature detector for detecting a temperature of the heating member, a signal generator for generating a switching signal that periodically controls permission and prohibition of energization of each of the divided induction coils, and a controller for controlling supply of a driving current to each of the divided induction coils to heat the heating member. The controller controls the energization by periodically switching the driving current to each of the divided induction coils on the basis of an energization signal that determines the permission and the inhibition of the driving currents according to a signal of temperature detected by the temperature detector, and the switching signal.

Abstract: An induction-heating fixing apparatus comprising: a heating member for fixing a toner image to a recording material carrying the toner image by heating the toner image; an induction-heating coil divided into a plurality of coils and comprising a first induction-heating coil and a second induction-heating coil adjacent to each other; and a power-distribution control member for controlling power distribution by supplying a driving-current to the plurality of induction-heating coils in order to heat the heating member, wherein the power-distribution control member comprises a determining section for selecting whether to supply the driving-current to the first induction-heating coil or the second induction-heating coil.

Abstract: The present invention concerns a fixing apparatus and an image-forming apparatus. The fixing apparatus and the image-forming apparatus include a heating roller; a heating element disposed in the heating roller; a pressing roller pressure-contacting the heating roller to fix an image onto a transfer sheet passing through a pressure-contacting section between the heating roller and the pressing roller; and a cooling device to cool the heating roller. In the fixing apparatus, the cooling device is activated during a predetermined time period after consecutive fixing operations are completed. While, the image-forming apparatus further includes a control section to activate the cooling device during a predetermined time period after consecutive fixing operations are completed.

Abstract: A fixing apparatus using a thin-sleeve roller is provided which gives a good fixing result while suppressing electric power consumption. The fixing apparatus includes a hollow cylindrical heating roller, a heat source positioned inside the heating roller, a pressing roller that is in pressure contact with the heating roller to form a nip between the heating roller and the pressing roller, and a controller that controls a conveyance velocity of the transfer material. The heating roller is divided into a first regions and a second region, with the first region being outside the second region. And the heat source includes a first heating section that mainly heats the first region, and a second heating section that mainly heats the second region.

Abstract: The present invention concerns a fixing apparatus and an image-forming apparatus. The fixing apparatus and the image-forming apparatus include a heating roller; a heating element disposed in the heating roller; a pressing roller pressure-contacting the heating roller to fix an image onto a transfer sheet passing through a pressure-contacting section between the heating roller and the pressing roller; and a cooling device to cool the heating roller. In the fixing apparatus, the cooling device is activated during a predetermined time period after consecutive fixing operations are completed. While, the image-forming apparatus further includes a control section to activate the cooling device during a predetermined time period after consecutive fixing operations are completed.

Abstract: In a device for fixing a toner image, provided with a heating roller including a heater, the heating roller having a length larger than a possible largest size sheet to be fixed so that the heating roller has an excess portion on which a small size sheet does not pass over; a pressing roller for coming in contact with the heating roller; and a cooling roller for coming in contact with the excess portion of the heating roller so as to cool the excess portion; one of the heating roller and the cooling roller is a metal roller and the other one is a roller comprising an elastic material layer.