Toner cartridge including detection gear, agitator gear, auger gear, and toner outlet

A toner cartridge comprising:

• a casing configured to accommodate toner therein, the casing having a first end portion and a second end portion opposite to each other in a first direction, the second end portion including a toner outlet including a through-hole in an outer surface of the casing of the toner cartridge, the toner outlet being configured to allow the toner in the casing to be discharged outside of the casing of the toner cartridge by passing the toner therethrough;
• an auger rotatable about a first axis extending in the first direction, the auger being configured to convey the toner in the first direction;
• an auger gear rotatable with the auger, the auger gear being positioned at the first end portion of the casing;
• an agitator rotatable about a second axis extending in the first direction, the agitator being configured to convey the toner toward the auger;
• an agitator gear rotatable with the agitator, the agitator gear being positioned at the first end portion of the casing;
• and
• a detection gear rotatable about a third axis extending in the first direction and positioned at the first end portion of the casing, the detection gear being positioned on an opposite side of the agitator gear from the auger gear in a second direction crossing the first direction, the detection gear comprising:
• a main body centered on the third axis and having an outer peripheral surface facing radially outward and extending a first radial distance from the third axis;
• and
• a plurality of gear teeth provided at the main body, the gear teeth extending radially outward from the third axis a second radial distance that is smaller than the first radial distance.