US 11,835,904 B2
Image forming apparatus including controller capable of determining whether developing cartridge, drum cartridge and belt unit are reached their lifetimes
Tadao Kyotani, Nagoya (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Sep. 27, 2021, as Appl. No. 17/486,348.
Application 17/486,348 is a continuation of application No. PCT/JP2019/042791, filed on Oct. 31, 2019.
Claims priority of application No. 2019-063075 (JP), filed on Mar. 28, 2019.
Prior Publication US 2022/0019174 A1, Jan. 20, 2022
Int. Cl. G03G 15/00 (2006.01); G03G 21/00 (2006.01); G03G 15/08 (2006.01); G03G 21/18 (2006.01)
CPC G03G 15/553 (2013.01) [G03G 15/0863 (2013.01); G03G 15/556 (2013.01); G03G 21/1875 (2013.01); G03G 21/1889 (2013.01); G03G 2215/0697 (2013.01); G03G 2221/1823 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A developing cartridge comprising:
a developing roller; and
a developing memory having:
a first developing storage area storing therein developing identification information which identifies a specific type of the developing cartridge from among a plurality of types of the developing cartridge; and
a second developing storage area different from the first developing storage area, the second developing storage area storing therein a developing cumulative number of printed sheets printed by using the developing cartridge, a cumulative developing roller rotation number when the printing is performed by using the developing cartridge, and a cumulative dot count printed by using the developing cartridge,
wherein whether the developing cartridge is reached a lifetime is determinable, at least in part, on a basis of:
the developing cumulative number of printed sheets stored in the second developing storage area, the cumulative developing roller rotation number stored in the second developing storage area and the cumulative dot count stored in the second developing storage area.