An image forming apparatus includes a fixing device including a heating roller configured to heat a sheet when the heating roller rotates, a temperature sensor configured to detect a temperature of the heating roller; and a controller configured to obtain a temperature detected by the temperature sensor at intervals of a predetermined sampling time, calculate, at the intervals of the predetermined sampling time, a temperature-decrease-amount of the detected temperature over a unit time that is longer than the predetermined sampling time, and stop rotation of the heating roller when the calculated temperature-decrease-amount is greater than a predetermined threshold value.

A fixing device includes a fixing rotator, a heater, a pressure rotator, a stay, a biasing member fixed to the stay, and a nip formation pad. The nip formation pad is supported by the stay, disposed inside the fixing rotator, and forms a nip. The nip formation pad includes at least one engaged portion at a position other than both ends of the nip formation pad or engaged portions at both ends of the nip formation pad. The at least one engaged portion engages an engaging portion in the stay to generate a first rotational moment. The engaged portions at both ends engage engaging portions in the stay to generate a second rotational moment. Each rotational moment is smaller than a rotational moment generated by engagement between an engaging portion in the stay and an engaged portion at only one end of the nip formation pad.

In an image forming apparatus, a cleaning blade, disposed on a downstream side of a transfer roller in a rotation direction of an image carrier, removes toner remaining on the image carrier after transfer of a toner image to an intermediate transfer member. After completion of an image forming operation, a controller causes the transfer roller to separate from the intermediate transfer member, cause the developing device to form on the image carrier a toner band to be supplied to the cleaning blade, and cause rotation of the image carrier to stop such that at least a part of the toner band formed on the image carrier stops within a section from a first position facing the transfer roller to a second position facing the cleaning blade in the rotation direction.

In one aspect an apparatus for use in an electrographic printer is described. The apparatus includes a housing defining a cavity, a developer roller, a developer electrode for developing printing substance onto the developer roller, the electrode being arranged within the cavity, and a heater for heating printing substance to be developed onto the developer roller, the heater being arranged in the cavity.

A duration measuring section measures a plurality of times. A temperature measuring section measures a temperature of a heater at each of the times. A temperature information outputting section outputs heater temperature information. A temperature tendency computing section outputs temperature tendency information of the heater. A drive controller outputs linear velocity information for controlling the linear velocity of a pressure roller. A pressure roller drive section drives the pressure roller.

A fixing device includes a fixing rotator, a heater, a pressure rotator, a stay, a biasing member fixed to the stay, and a nip formation pad. The nip formation pad is supported by the stay, disposed inside the fixing rotator, and forms a nip. The nip formation pad includes at least one engaged portion at a position other than both ends of the nip formation pad or engaged portions at both ends of the nip formation pad. The at least one engaged portion engages an engaging portion in the stay to generate a first rotational moment. The engaged portions at both ends engage engaging portions in the stay to generate a second rotational moment. Each rotational moment is smaller than a rotational moment generated by engagement between an engaging portion in the stay and an engaged portion at only one end of the nip formation pad.

A heater for an image heating device includes a substrate having first and second surfaces, a heat generating element electrically connected to a first electrode group, both formed on the first surface, a temperature detection element electrically connected to a second electrode group, both formed on the second surface. A plurality of first feed terminals provided in the image heating device in contact with the first electrode group. A plurality of second feed terminals provided in the image heating device in contact with the second electrode group. The first and second electrode groups are disposed on the same side of a midpoint of the substrate in a longitudinal direction. The second electrode group is disposed closer to the midpoint than the first electrode group in the longitudinal direction. The first and second electrode groups are disposed with a gap between the first and second electrode groups in the longitudinal direction.

A fixing device includes an endless fixing rotator, a temperature detector, a pressure rotator, a nip formation pad, and a plurality of heaters. The temperature detector detects a temperature of the fixing rotator. The pressure rotator is in contact with an outer circumferential surface of the fixing rotator. The nip formation pad is disposed inside a loop of the fixing rotator to form a nip between the fixing rotator and the pressure rotator. The plurality of heaters heat an inner circumferential surface of the fixing rotator and includes a first heater and a second heater. The first heater uniformly generates heat in a longitudinal direction of the fixing rotator and independently receives power. The second heater generates different heat generation amounts at different positions in the longitudinal direction of the fixing rotator and receives power together with the first heater.

An image forming apparatus with accurate color shift correction with consideration of a change in a rotational speed of a driving portion of a laser scanning member includes a light source, the laser scanning member, a driving portion, a speed controlling portion, a light detecting portion, a light source controlling portion, a scanning lens, a housing, a temperature gradient detecting portion, a first temperature detecting portion, and a correction processing portion. The temperature gradient detecting portion detects a temperature gradient in the housing. The first temperature detecting portion detects a temperature of the scanning lens. The correction processing portion corrects an emission start timing at which light corresponding to a line of image data is emitted from the light source, based on the temperatures detected by the temperature gradient detecting portion and the first temperature detecting portion, the rotational speed of the driving portion, and a preset arithmetic expression.

There is disclosed a device such as a printer or temperature control device for a printer. The device may comprise a photoreceptor. The device may further comprise a heat exchanger to regulate a temperature of the photoreceptor. The device may further comprise a temperature regulator to measure a temperature of a surface of the photoreceptor and control the heat exchanger based on the measured temperature. The device may further comprise a superior temperature controller to, during a pre-print phase of a print action, inhibit the control of the heat exchanger by the temperature regulator and control the heat exchanger to provide a specified amount of heat exchange.