A fixing device includes: a heating unit configured to heat a medium to be conveyed along a conveyance path by radiation; and a shielding unit made of non-metallic material, the shielding unit being configured to form a shielding state in which radiation from the heating unit is shielded and a non-shielding state in which radiation from the heating unit is not shielded, in which the shielding unit being expanded in a direction intersecting the radiation in the shielding state and is stored in the non-shielding state.

An example device includes: a print engine including a fuser; an ambient temperature sensor; a memory storing a plurality of curves that relate, for given respective ambient temperatures, respective time periods for the fuser to heat to a fusing temperature, to respective factors associated with cooling of the fuser; and a processor The processor is to: detect a current ambient temperature using the ambient temperature sensor; select a curve, from the plurality of curves, using the current ambient temperature; determine a current factor associated with cooling of the fuser; and control the fuser to heat to the fusing temperature based on a respective time period determined from the curve and the current factor associated with cooling of the fuser.

An apparatus for use in a selective toner electrophotographic process (STEP) additive manufacturing system, the apparatus includes a radiant heat source configured to emit radiation of a first band of wavelengths in the region of a transfuse roller nip; and a pyrometer configured to receive and measure radiation emitted from the region of the transfuse roller nip; wherein the radiation measured by the pyrometer comprises a second band of wavelengths different from the first band of wavelengths emitted by the radiant heat source. The radiant heat source is typically one or more laser light emitters.

An example image forming apparatus includes an image forming unit to form a toner image on a print medium, a fusing unit to fix the toner image to the print medium, a duct comprising an air inlet located adjacent to an exit of the fusing unit and an air discharge outlet located toward a discharge outlet through which the print medium is discharged, and a blower provided in the duct to discharge air to the air discharge outlet.

An image forming apparatus includes an apparatus main body; a cover member that is provided rotatable in a rotation direction about a rotation axis with respect to the apparatus main body, having an opening part, a fuser that fuses a toner image formed on each medium of media wherein the fuser is attached to the apparatus main body by being inserted through the opening part and detached from the apparatus main body by being pulled out of the opening part; and a sub cover member that has an surface portion and is attached to the fuser, wherein in a state in which the fuser is attached to the image forming apparatus, the surface portion of the sub cover is arranged within the opening part, the sub cover member moves in the rotation direction in correspondence with the rotation of the cover member.

An example image forming apparatus includes an image forming unit to form a toner image on a print medium, a fusing unit to fix the toner image to the print medium, a duct comprising an air inlet located adjacent to an exit of the fusing unit and an air discharge outlet located toward a discharge outlet through which the print medium is discharged, and a blower provided in the duct to discharge air to the air discharge outlet.

An image forming apparatus includes an image former, a fuser, a first sensor, and a processor. The image former is configured to form an image on a recording medium. The fuser is configured to fix the image on the recording medium. The first sensor is configured to detect a temperature of the fuser. The processor is configured to cause the recording medium to be supplied to the fuser after warming up the fuser to a warm up temperature. The processor is also configured to supply power to the fuser after causing the recording medium to be supplied to the fuser, an amount of the supplied power being based on the temperature detected before starting the warming up.

A fixing device includes: a heating unit configured to heat a medium to be conveyed along a conveyance path by radiation; and a shielding unit made of non-metallic material, the shielding unit being configured to form a shielding state in which radiation from the heating unit is shielded and a non-shielding state in which radiation from the heating unit is not shielded, in which the shielding unit being expanded in a direction intersecting the radiation in the shielding state and is stored in the non-shielding state.

A toner includes polyolefin and has an exothermic peak in a range from 40° C. to 70° C. in a cooling process of the polyolefin by the DSC after a first heating process of the polyolefin by DSC. The polyolefin does not have an exothermic peak in the cooling process of the polyolefin by the DSC after the first heating process of the polyolefin by the DSC, and has an exothermic peak in a range from 0° C. to 30° C. in a second heating process of the polyolefin by the DSC.

An image forming apparatus includes an apparatus main body; a cover member that is provided rotatable in a rotation direction about a rotation axis with respect to the apparatus main body, having an opening part, a fuser that fuses a toner image formed on each medium of media wherein the fuser is attached to the apparatus main body by being inserted through the opening part and detached from the apparatus main body by being pulled out of the opening part; and a sub cover member that has an surface portion and is attached to the fuser, wherein in a state in which the fuser is attached to the image forming apparatus, the surface portion of the sub cover is arranged within the opening part, the sub cover member moves in the rotation direction in correspondence with the rotation of the cover member.