An image forming apparatus includes a heating rotary member that heats toner born on a recording material, and a pressure rotary member that pressurizes the heating rotary member. These rotary members form a fixing nip portion and fix a toner image to the recording material at the fixing nip portion while nipping and conveying the recording material. The apparatus further includes a web that collects toner adhering to a surface of the heating rotary member, a winding roller that winds the web, a motor that rotates the winding roller, a contact member that makes contact with an outer surface of the wound web and moves based on a position of the outer surface, a variable resistor that is connected to change a resistance value depending on a position of the contact member, and a control unit that controls a rotation amount of the motor based on the resistance value.

A fixing member for electrophotography having an endless shape has a base layer having an endless shape, and an elastic layer on the outer circumferential surface of the base layer. The elastic layer includes a silicone rubber and a filler dispersed in the silicone rubber. The total amount of the filler compounded in the elastic layer is 30 vol % or less based on the total volume of the elastic layer. The elastic layer satisfies the relation of λtd>λmd>λnd. λtd is a thermal conductivity of the elastic layer in the circumferential direction, λnd is a thermal conductivity of the elastic layer in the thickness direction, and λmd, is a thermal conductivity of the elastic layer in the longitudinal direction. λtd is 2.0 W/(m.Math.K) or more, and λnd is 1.3 W/(m.Math.K) or more.

A fixation device according to one of embodiments includes a first and second fixation units. The first fixation unit includes: a first belt; a first pad with a first elastic layer; and a first roller provided downstream of the first pad in a conveyance direction of a medium. The second fixation unit includes: a second belt; a second pad including a second elastic layer and pressed against the first pad with the first and second belts interposed in between; and a second roller provided downstream of the second pad in the conveyance direction and pressed against the first roller with the first second belts interposed in between. A thickness of at least one of the first and second elastic layers is smaller on a downstream side in the conveyance direction than on an upstream side in the conveyance direction.

An image heating apparatus includes a heater having a first heating block and a second heating block, a heating rotating member to be heated by the heater, a pressure rotating member forming a nip portion for conveying a recording material between the pressure rotating member and the heating rotating member, first temperature detection elements and second temperature detection elements for detecting temperatures of the first heating block and second heating block respectively at positions farther from a recording material conveyance reference position than the first temperature detection elements. In the image heating apparatus, the first temperature detection elements are arranged on a side downstream of the heater in a recording material conveying direction, and the second temperature detection elements are arranged on a side upstream of the first temperature detection elements in the recording material conveying direction.

An image formation apparatus according to an embodiment may include a fixation device and a controller. The fixation device includes: a fixation member includes a first region and a second region located closer to a center in a longitudinal direction of the fixation member than the first region; a pressurizing member that forms a nip portion between the fixation member and the pressurizing member; first and second heat generating portions that heat the first and second regions, respectively; a first sensor that detects a first temperature of one of the pressurizing member and the fixation member at a position corresponding to the first region; and a second sensor that detects a second temperature of the one at a position corresponding to the second region. The controller controls a drive speed of the pressurizing member or the fixation member based on the first and second temperatures.

An image heating apparatus includes a heater having a first heating block and a second heating block, a heating rotating member to be heated by the heater, a pressure rotating member forming a nip portion for conveying a recording material between the pressure rotating member and the heating rotating member, first temperature detection elements and second temperature detection elements for detecting temperatures of the first heating block and second heating block respectively at positions farther from a recording material conveyance reference position than the first temperature detection elements. In the image heating apparatus, the first temperature detection elements are arranged on a side downstream of the heater in a recording material conveying direction, and the second temperature detection elements are arranged on upstream of the first temperature detection elements in the recording material conveying direction.

An imaging system includes an endless belt to convey a medium, a heating member to heat the endless belt, a pressure member to press the endless belt against the heating member, and a cooling device. The cooling device is in contact with the endless belt at a non-linear portion of the endless belt and includes an interior space.

An image forming apparatus includes a fixing belt, a steering roller, a pressure rotation member, and a control unit. The pressure rotation member forms a nip portion with the fixing belt to convey a recording material. In continuously performing fixing on recording materials, the control unit controls the steering roller such that a distance between a center position of the fixing belt when an operation to tilt the steering roller is performed for a first time after the center position is moved away from a center position of a moving range of the fixing belt and the center position of the moving range is smaller in a period after a last but one recording material before the pressure rotation member enters a separated state from the fixing belt passes through the nip portion than in a period before the recording material passes through the nip portion.

The heating apparatus including a plurality of heat generation members including first, second and third generation members, the second heat generation member and the third heat generation member having lengths in a longitudinal direction shorter than a length of the first heat generation member, the heating apparatus including first, second, third, and fourth contacts, and a first switching unit configured to bring an electric path between the second contact and the fourth contact into one of a connecting state and an open state.

A fixing device includes a rotatable endless belt, a pressure rotator, a heating rotator, a pad, an intermediate member, and a holder. The pad is disposed inside a loop of the endless belt and pressed by the pressure rotator to form a fixing nip portion between the endless belt and the pressure rotator. The intermediate member has a pad abutment portion to abut on the pad at a fixing nip facing portion of the pad. The holder holds the pad and the intermediate member, and has an intermediate member abutment portion to abut on a pad facing portion of the intermediate member. The pad has a recess in the fixing nip facing portion. The pad abutment portion abuts on the fixing nip facing portion and covers the recess in at least a part of the fixing nip portion corresponding to a passage region of a recording medium.