A fixing device includes a heating body, a pressuring body, a heating source, a guiding part, a temperature sensing part and a charging part. The heating source supplies the heating body heat used for heating the medium. The guiding part guides the medium to a nip between the heating body and the pressuring body, at an upstream side from the nip in a conveying direction of the medium. The temperature sensing part senses a temperature of the heating body. The charging part electrically discharges to electrically charge the heating body with the same polarity as toner, at an opposite side to the guiding part across the temperature sensing part. The charging part includes a discharging electrode electrically discharging toward the heating body facing to the discharging electrode and an enclosure wall supporting the discharging electrode, enclosing the discharging electrode and producing an electric field in cooperation with the discharging electrode.

An image forming apparatus includes a forming part that forms an image on a ribbon-like medium that is being transported; and a fixing part disposed downstream of the forming part in a medium transport direction, the fixing part including multiple fixing members, which are arranged in the transport direction and fix the image to the medium by applying heat and pressure to the medium. An upstream-downstream tension difference, in the medium transport direction, of the fixing member located on the most upstream side in the transport direction is greater than those of the other fixing members in the medium transport direction.

A heating device includes a conveying unit, a heating unit, a temperature detecting unit and a controller. The conveying unit conveys a recording material. The heating unit includes a plurality of heat sources which are disposed so that locations thereof are different from each other in a conveying direction of the recording material, and heats the conveyed recording material. The temperature detecting unit is positioned on an upstream side in the conveying direction of the recording material with respect to the plurality of heat sources, and detects a temperature of the heating unit. The controller controls one of the plurality of heat sources based on a detecting result obtained by the temperature detecting unit. The one of the plurality of heat sources is positioned on the upstream side in the conveying direction of the recording material.

A heating device includes a heating member body having a surface that is configured to contact a continuous medium; plural heat sources that are arranged in a width direction of the continuous medium and that are configured to increase a temperature of the heating member body; an electric power circuit that is configured to supply electric power to the heat sources in accordance with a width of the continuous medium; a heat transfer member that is disposed so as to face the heat sources and that extends in the width direction of the continuous medium; and an overheat prevention device that is disposed in contact with the heat transfer member and that is configured to stop supply of electric power from the electric power circuit if a temperature of the heat transfer member exceeds a predetermined temperature.

A heating device includes a heating member body having a surface that is configured to contact a continuous medium; plural heat sources that are arranged in a width direction of the continuous medium and that are configured to increase a temperature of the heating member body; an electric power circuit that is configured to supply electric power to the heat sources in accordance with a width of the continuous medium; a heat transfer member that is disposed so as to face the heat sources and that extends in the width direction of the continuous medium; and an overheat prevention device that is disposed in contact with the heat transfer member and that is configured to stop supply of electric power from the electric power circuit if a temperature of the heat transfer member exceeds a predetermined temperature.

An image forming apparatus includes an accommodating portion configured to accommodate a recording material; a first heating portion configured to heat the recording material accommodated in the accommodating portion; a recording material feeding portion configured to feed the recording material from the accommodating portion; an image forming portion configured to form an image, on a surface of the recording material fed by the recording material feeding portion, with a liquid developer containing toner and an ultraviolet curable agent; a second heating portion configured to heat the image, formed on the surface of the recording material, by irradiating the surface of the recording material with infrared radiation; and an ultraviolet irradiating portion configured to irradiate the surface of the recording material, with ultraviolet radiation, already irradiated with the infrared radiation by the second heating portion.

A fixing device fixes a toner image formed on a recording medium to the recording medium. The fixing device includes a fixing roller, a pressure roller, and a first heater. The pressure roller is disposed opposite to the fixing roller to form a fixing nip therebetween. The first heater performs non-contact heating on the toner image that has passed through the fixing nip and that has been fixed to the recording medium to melt the toner image. The first heater is disposed adjacent to a conveyance path through which the recording medium that has passed through the fixing nip is conveyed.

An image forming system includes a first image forming apparatus and a second image forming apparatus. The first image forming apparatus includes a first housing having a first guide and a first housing contact portion, and a first fixing unit having a first unit contact portion. The second image forming apparatus includes a second housing having a second guide and a second housing contact portion, and a second fixing unit having a second fixing unit. The first unit contact portion contacts the second housing contact portion during the process the first fixing unit is guided by the second guide and interferes with installation of the first fixing unit into the second housing. The second unit contact portion contacts the first housing contact portion during the process the second fixing unit is guided by the first guide and interferes with installation of the second fixing unit into the first housing.

A fixing device includes a transport section that grasps a leading edge part of a recording medium and transports the recording medium, a heating part that heats, in a non-contact manner, a surface of the recording medium on which an unfixed image is formed, the recording medium being transported by the transport section, and an air discharge part that is disposed at a position facing the heating part across a transport path along which the recording medium is transported, and that discharges air toward the transport path, in which the air discharge part includes a housing that defines the air discharge part, the housing including a surface-perforated plate portion in which multiple ventilation holes for discharging air toward the transport path are formed, and an air supply unit that supplies air to an inside of the housing through an air inlet formed in the housing, and an internal pressure of the housing is made higher than an atmospheric pressure by the air supplied from the air supply unit, and the air is discharged toward the transport path through the ventilation holes of the surface-perforated plate portion.