An image forming apparatus includes: a motor; a temperature detector; a conveyor; a sheet detector; and a controller configured to perform: (a) controlling a conveying speed of the sheet; (b) determining whether a paper jam has occurred; and (c) determining, when the paper jam has occurred, whether a torque shortage has occurred. The torque shortage is shortage of a torque occurring during conveyance of the sheet. When the torque shortage has occurred, and the paper jam is resolved and conveyance of the sheet is resumed, the controller performs in the (a) controlling: controlling, when an ambient temperature detected by the temperature detector is higher than a predetermined temperature, the conveying speed to become a first conveying speed; and controlling, when the ambient temperature is lower than or equal to the predetermined temperature, the conveying speed to become a second conveying speed slower than the first conveying speed.

In a first operation mode in which a first addition value for each sheet of a recording material and a first initial control temperature, when the total sum of the first addition values exceeds a predetermined threshold value, a control portion of an image heating portion, which heats an image on the recording material, of an image forming apparatus changes the first initial control temperature to a first correction control temperature. When the operation mode is changed from the first operation mode to a second operation mode in which a second addition value different from the first addition value and a second initial control temperature different from the first initial control temperature, the control portion corrects the first correction control temperature based on a difference between initial control target temperatures.

An image forming apparatus that forms images on sheets, includes: a collection unit configured to collect history information relating to operation of the image forming apparatus; a selection unit configured to select, from among a plurality of accomplishment items, an accomplishment item relating to the operation of the image forming apparatus based on the history information; an acquisition unit configured to notify a user of one or more operation options related to the operation of the image forming apparatus that are for accomplishing the accomplishment item selected by the selection unit, and to acquire a selection result of whether or not the one or more operation options are to be used; and an operation control unit configured to control the operation of the image forming apparatus in accordance with the selection result.

An image forming apparatus includes a temperature sensor, a memory, a fixing device, and a controller. The temperature sensor is configured to detect a temperature of an inside of the image forming apparatus. The memory is configured to store temperature history information regarding a history of the temperature of the inside of the image forming apparatus detected by the temperature sensor. The fixing device is configured to fix a toner image onto the paper sheet by heating the paper sheet to a fixing temperature. The toner image is transferred to the paper sheet using a toner stored in a toner cartridge of the image forming apparatus. The controller is configured to control a fixing temperature at the fixing device based on the temperature history information stored in the memory.

An image forming apparatus includes a housing having an opening, a cover configured to open the opening in an open state and to close the opening in a close state, a photosensitive drum, a heater, a fan configured to force air out of the housing, and a controller. The cover in the open state is configured to allow a sheet with a toner image fixed thereon to be ejected through the opening. The heater is configured to heat a sheet to fix a toner image on the sheet, and is located between the cover in the close state and the photosensitive drum. During execution of a printing process, the controller is configured to cause the fan to rotate at a first speed if the cover is in the closed state, and to rotate at a second speed lower than the first speed if the cover is in the open state.

A remaining toner amount detecting apparatus detects a remaining toner amount in a toner bottle. The remaining toner amount detecting apparatus includes at least one pair of electrodes that are configured to face each other with the toner bottle interposed between the electrodes; a first estimator configured to estimate the remaining toner amount based on a capacitance between the electrodes of the at least one pair of electrodes; a second estimator configured to estimate the remaining toner amount by counting a number of pixels in a printed image; and an estimation selector configured to use either one of the first estimator or the second estimator to output the remaining toner amount, based on a temperature or a humidity inside an apparatus in which the toner bottle is mounted.

According to one embodiment, an image forming apparatus includes an image carrier, an exposing apparatus, a developing device, a transfer device, a fixing device, a history acquisition unit, an estimation unit, and an output unit. The exposing device exposes the image carrier to form an electrostatic latent image on the image carrier. The developing device includes a layer forming member to form a toner layer on a developing roller and forms a toner image by developing the electrostatic latent image. The transfer device transfers the toner image to a sheet. The fixing device fixes the toner image to the sheet. The history acquisition unit acquires a history regarding a temperature around the developing device. The estimation unit estimates a possibility that an image defect caused by the layer formation may occur on the basis of the history. The output unit outputs estimation results of the estimation.

An image forming apparatus including: a fixer that fixes a toner image formed on a recording medium by pressing and heating the recording medium nipped in a nip portion formed by causing two rotating bodies to pressedly abut on each other, and conveying the recording medium by rotating the rotating bodies; a motor that drives the rotating bodies by transmitting a torque to at least one of the rotating bodies; a torque detector that detects the torque transmitted to the rotating body by the motor; a temperature detector that detects temperature of the rotating body; a speed detector that detects a conveyance speed for conveying the recording medium by the fixer; and a controller that corrects the detected torque based on at least any one of the detected temperature and the detected conveyance speed and predicts a life of the fixer based on the corrected torque.

In one aspect an apparatus (200) for use in an electrographic printer (100) is described. The apparatus includes a housing (210) defining a cavity (220), a developer roller (250), a developer electrode (240) for developing printing substance onto the developer roller, the electrode being arranged within the cavity, and a heater (260) for heating printing substance to be developed onto the developer roller, the heater being arranged in the cavity.

An image forming apparatus includes: a latent image carrier on which a latent image is formed; a developing device that stores a developer, and develops the latent image formed on the latent image carrier using the developer; a concentration acquirer that acquires a concentration of the developer stored in the developing device; an atmospheric pressure acquirer that acquires an atmospheric pressure value at a position in which the image forming apparatus is installed; and a corrector that corrects the concentration detected by the concentration acquirer, on the basis of the atmospheric pressure value acquired by the atmospheric pressure acquirer.