US 11,669,029 B2
Image forming apparatus performing curl suppressing process
Shintaro Sakaguchi, Nagoya (JP); Noriaki Kishimoto, Aichi (JP); Shuhei Fukue, Nagoya (JP); and Shunsuke Ueki, Nagoya (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Nov. 18, 2021, as Appl. No. 17/530,117.
Claims priority of application No. JP2020-193059 (JP), filed on Nov. 20, 2020.
Prior Publication US 2022/0163909 A1, May 26, 2022
Int. Cl. G03G 15/20 (2006.01); B41J 3/60 (2006.01); B65H 5/06 (2006.01); B41J 13/00 (2006.01)
CPC G03G 15/2028 (2013.01) [B41J 3/60 (2013.01); B41J 13/0009 (2013.01); B65H 5/06 (2013.01); G03G 15/2064 (2013.01); B65H 2801/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An image forming apparatus, comprising:
a sheet tray accommodating a sheet;
a feed roller configured to feed the sheet from the sheet tray;
a transfer roller configured to transfer a developer image onto the sheet fed by the feed roller;
a fuser configured to fix the developer image on the sheet by heating and pressing;
a conveying unit configured to convey the sheet which has passed the fuser in a state in which the sheet is turned upside down, the conveying unit being configured to re-convey the sheet to the transfer roller; and
a controller configured to execute a normal process, when performing a single sided printing, the normal process being a process in which the controller is configured to form an image on a first surface of a first sheet without turning the first sheet upside down, and then configured to form an image on a first surface of a second sheet without turning the second sheet upside down, the second sheet being a sheet supplied next to the first sheet from the sheet tray,
wherein the controller is configured to execute a particular process, when performing the single sided printing, the particular process being a process in which the controller is configured execute a non-actual-printing process on the first surface of the first sheet, and then configured to execute the non-actual-printing on the first surface of the second sheet before executing an actual-printing process on a second surface of the first sheet, which is opposite to the first surface, the non-actual-printing process being a process of conveying the sheet to the fuser without transferring the developer image onto the first surface of the sheet in the transfer roller, the actual-printing process being a process of transferring the developer image onto the second surface of the sheet and fixing the developer image on the second surface by the fuser, the actual-printing process being executed after the controller re-conveys the sheet that has been processed by the non-actual-printing process to the transfer roller by the conveying unit.