US 11,747,755 B2
Image forming apparatus having controller for setting cooling threshold according to sheet size
Yasuhiro Maruyama, Nagoya (JP)
Assigned to Brother Kogyo Kabushiki Kaisha, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Apr. 14, 2022, as Appl. No. 17/720,445.
Claims priority of application No. 2021-068099 (JP), filed on Apr. 14, 2021.
Prior Publication US 2022/0334527 A1, Oct. 20, 2022
Int. Cl. G03G 15/20 (2006.01); G03G 15/00 (2006.01); G03G 21/20 (2006.01)
CPC G03G 15/2017 (2013.01) [G03G 15/2042 (2013.01); G03G 15/2046 (2013.01); G03G 15/6588 (2013.01); G03G 21/206 (2013.01); G03G 15/2039 (2013.01); G03G 2215/00734 (2013.01); G03G 2215/00772 (2013.01); G03G 2221/1645 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a feed roller that feeds a sheet having a width oriented in a width direction perpendicular to a conveyance direction of the sheet;
a process unit that forms a toner image on the sheet fed from the feed roller;
a fuser that heats and fixes the toner image formed on the sheet; and
a controller,
wherein the fuser comprises:
a heating member; and
a temperature sensor that detects a temperature at an end portion of the heating member which is one of two end portions thereof positioned apart from each other in the width direction,
wherein the controller is configured to:
identify a selected sheet size setting as defined by a dimension in the width direction and a dimension in the conveyance direction;
set a cooling threshold at a first threshold if the selected sheet size setting is a first size having a dimension in the width direction larger than a predetermined dimension, and a dimension in the conveyance direction larger than the dimension in the width direction;
set the cooling threshold at a second threshold lower than the first threshold if the selected sheet size setting is a second size having a dimension in the width direction that is the same as the dimension in the width direction of the first size, and a dimension in the conveyance direction smaller than the dimension in the width direction;
execute a printing process by controlling the feed roller, the process unit, and the fuser; and
execute, if a temperature detected by the temperature sensor becomes equal to or higher than the cooling threshold during execution of the printing process, a cooling process to restrain a rise in temperature of the heating member.