An image forming device includes: a print engine to form an image on a medium, a sensor to irradiate light onto the medium and to detect an amount of light transmitted through the medium, and a processor to control the print engine based on the detected transmitted light amount and temperature data.

An image forming apparatus includes an image forming unit, a fixing unit, a plurality of exterior covers forming an exterior of the image forming apparatus, a fan configured to suck outside air into the image forming apparatus through an air intake port, a temperature sensor configured to detect a temperature of the outside air sucked by the fan, and a partition member disposed upstream the temperature sensor and downstream the air intake port in an airflow generated by the fan, the partition member dividing an air intake path through which the outside air sucked through the air intake port passes into a first path passing through a fixing unit side and a second path passing through a temperature sensor side.

An image forming apparatus configured to form an image on a recording material includes a detection unit configured to detect a temperature of a first member, and an estimation unit configured to estimate a temperature of a second member, which is different from the first member. The estimation unit is configured to estimate, based on the temperature of the second member estimated by the estimation unit at a first timing, which is a timing before the image forming apparatus is powered off, the temperature of the first member detected by the detection unit at a second timing, which is a timing after the image forming apparatus is powered on, and information representing an operation history of the image forming apparatus until when the image forming apparatus is powered off, the temperature of the second member at the second timing.

An image forming apparatus includes a controller configured to execute a discharging operation for discharging a toner from a developing device onto an image bearing member in a region corresponding to an interval between a recording material and a subsequent recording material in a continuous image forming job. The controller executes the discharging operation on the basis of integral information based on a relationship of a predetermined deterioration threshold with a value correlating with an amount of toner consumption. The controller changes the relationship based on a detected temperature upon toner consumption, and the controller changes the relationship so that when a temperature obtained on the basis of detected information is not less than a predetermined temperature, execution of the discharging operation is promoted more than when the obtained temperature is less than a predetermined temperature.

An image forming apparatus includes an image forming unit, a fixing unit, a plurality of exterior covers forming an exterior of the image forming apparatus, a fan configured to suck outside air into the image forming apparatus through an air intake port, a temperature sensor configured to detect a temperature of the outside air sucked by the fan, and a partition member disposed upstream the temperature sensor and downstream the air intake port in an airflow generated by the fan, the partition member dividing an air intake path through which the outside air sucked through the air intake port passes into a first path passing through a fixing unit side and a second path passing through a temperature sensor side.

An image forming apparatus to execute an image forming operation for forming an image includes an image bearing member, a development unit, a drive unit, a controller, and a humidity detection unit to detect humidity near the development unit. The development unit contains developer and includes a conveyance member to convey the developer and a developer carrying member to carry the developer to a position where an electrostatic latent image formed on the image bearing member is developed. The controller controls the conveyance and the developer carrying member through the drive unit not to execute a mode for driving the conveyance and the developer carrying member without executing the image forming operation when the humidity detected when power of the image forming apparatus is shifted from off to on is higher than a predetermined value, and to execute the mode when the detected humidity falls below the predetermined value afterward.

An image forming apparatus includes a forming unit, a transfer unit, a blowing unit, a temperature detection unit, and a control unit. The forming unit forms a toner image on a photosensitive member. The transfer unit transfers the formed toner image onto a recording material. The blowing unit takes outside air into the apparatus to generate an air flow for adjusting a temperature of the transfer unit. The temperature detection unit detects an ambient temperature outside the apparatus. The control unit controls driving of the blowing unit based on the detected ambient temperature. The control unit drives the blowing unit in a case where the detected ambient temperature is less than or equal to a first temperature threshold and a gradient value indicating a change in the detected ambient temperature is at least a first gradient threshold.

An image forming apparatus to execute an image forming operation for forming an image includes an image bearing member, a development unit, a drive unit, a controller, and a humidity detection unit to detect humidity near the development unit. The development unit contains developer and includes a conveyance member to convey the developer and a developer carrying member to carry the developer to a position where an electrostatic latent image formed on the image bearing member is developed. The controller controls the conveyance and the developer carrying member through the drive unit not to execute a mode for driving the conveyance and the developer carrying member without executing the image forming operation when the humidity detected when power of the image forming apparatus is shifted from off to on is higher than a predetermined value, and to execute the mode when the detected humidity falls below the predetermined value afterward.

A fixing device includes a first fixing member, a second fixing member, a heater, a temperature sensor, a sensor holder, and a first frame. The temperature sensor detects a temperature of the first fixing member or the second fixing member. The sensor holder is configured to hold the temperature sensor and is fixed on the first frame. The first frame is made of metal and includes a first bend, a second bend, a third bend, a first wall, a second wall, a third wall, and a fourth wall. The second wall is connected to the first wall via the first bend. The third wall is connected to the second wall via the second bend. The fourth wall is connected to the third wall via the third bend. The first wall and the second wall form an acute angle.

A printing device containing a heating apparatus that heats an image substrate, a temperature sensor associated with the image substrate and a processor communicatively coupled to the heating apparatus. The processor determines the heating power of the heating apparatus, compares the heating power to a predetermined power range, determines a status of the temperature sensor when the heating power is outside the predetermined power range, and triggers a response mode of the printing device based on the determined status of the temperature sensor.