US 11,754,955 B2
Image forming apparatus
Kazuma Hinoue, Nagoya (JP); Shintaro Suzuki, Nagoya (JP); Sota Hirano, Kasugai (JP); and Ayaka Komori, Nagoya (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Jul. 28, 2022, as Appl. No. 17/815,611.
Application 17/815,611 is a continuation of application No. PCT/JP2020/044626, filed on Dec. 1, 2020.
Claims priority of application No. 2020-012144 (JP), filed on Jan. 29, 2020.
Prior Publication US 2022/0365470 A1, Nov. 17, 2022
Int. Cl. G03G 15/08 (2006.01); G03G 15/00 (2006.01)
CPC G03G 15/5016 (2013.01) [G03G 15/0863 (2013.01); G03G 15/553 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a main body including a display;
a drum cartridge configured to be mounted to the main body and including:
a photosensitive drum;
a developing chamber configured to accommodate toner; and
a drum memory;
a toner cartridge configured to be mounted to the drum cartridge and including:
a housing configured to accommodate the toner;
a supply unit configured to supply the toner from the housing to the developing chamber; and
a toner memory; and
a controller configured to:
store, in the drum memory, a cumulative toner receiving amount which is a cumulative amount of the toner supplied from the toner cartridge and received in the developing chamber, a cumulative toner consumption amount which is a cumulative amount of the consumed toner, and a cumulative drum printing sheet number which is a number of sheets on which an image is formed by the photosensitive drum,
store, in the toner memory, a cumulative toner supply amount which is a cumulative amount of the toner supplied by the supply unit from the housing to the developing chamber,
display, on the display. a message requesting replacement of the drum cartridge in a case where the controller determines that the cumulative drum printing sheet number is equal to or higher than a first given sheet number for determining whether the drum cartridge is empty,
display, on the display, a message requesting replacement of the toner cartridge in a case where the controller determines that the cumulative toner supply amount of the toner cartridge is equal to or higher than a first supply amount for determining whether the toner cartridge is empty,
in a case where the controller determines that the cumulative toner supply amount is equal to or higher than the first supply amount and the cumulative drum printing sheet number is equal to or higher than a second given sheet number which is lower than the first given sheet number, cause the display not to display any message requesting replacement of the drum cartridge or the toner cartridge until a value obtained by subtracting the cumulative toner consumption amount from the cumulative toner receiving amount becomes equal to or lower than a first threshold regardless of whether the cumulative drum printing sheet number is equal to or higher than the first given sheet number, and
display, on the display, a message requesting replacement of both the drum cartridge and the toner cartridge on a condition that the value obtained by subtracting the cumulative toner consumption amount from the cumulative toner receiving amount is equal to or lower than the first threshold.