US 11,953,849 B2
Image forming apparatus
Tatsuya Koyama, Toyoake (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Jul. 13, 2022, as Appl. No. 17/812,213.
Claims priority of application No. 2021-125942 (JP), filed on Jul. 30, 2021.
Prior Publication US 2023/0036856 A1, Feb. 2, 2023
Int. Cl. G03G 15/20 (2006.01); G01K 3/00 (2006.01)
CPC G03G 15/2039 (2013.01) [G01K 3/005 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a main body casing;
a fixing unit configured to fix developer to a sheet by heating and pressurization, the fixing unit including: a heating unit configured to heat the sheet; and an end portion temperature sensor configured to detect a temperature of the heating unit;
a fan configured to discharge air inside the main body casing to outside of the main body casing; and
a controller,
wherein when the fixing unit is fixing the developer to the sheet, the controller is configured to:
determine a heating unit temperature based on the temperature detected by the end portion temperature sensor;
stop the fan in a case of determining that the heating unit temperature is not less than a threshold value; and
drive the fan in a case of determining that the heating unit temperature is less than the threshold value,
wherein the heating unit is elongated in a longitudinal direction,
the heating unit has a minimum-width-sheet passing area through which a minimum-width-sheet passes, the minimum-width-sheet having a minimum width to fix the developer by the fixing unit, and
in the longitudinal direction of the heating unit, the end portion temperature sensor is arranged outside of the minimum-width-sheet passing area.