Developing cartridge including housing and gear

A cartridge comprising:

• a developing roller rotatable about a roller axis extending in a first direction, the developing roller including a developing roller shaft extending in the first direction;
• a housing configured to accommodate developing material therein;
• an electrode electrically connected to the developing roller shaft, the electrode being positioned at one outer surface of the housing in the first direction;
• a protrusion extending in the first direction, the protrusion being positioned at the one outer surface of the housing, the protrusion being movable relative to the housing;
• a first gear rotatable about a first axis extending in the first direction, the first gear being positioned at the one outer surface of the housing, the first gear being positioned farther from the developing roller shaft than the protrusion is from the developing roller shaft;
• and
• a plurality of teeth positioned at the one outer surface of the housing, the plurality of teeth being movable relative to the housing from a first position to a second position in response to a rotation of the first gear, the plurality of teeth engaging with the first gear at the first position, the plurality of teeth not engaging with the first gear at the second position;
• and
• wherein the protrusion moves relative to the housing in a state where the plurality of teeth is at the first position, and
• wherein the protrusion does not move relative to the housing in a state where the plurality of teeth is at the second position.