Developer Cartridge Provided with Gear Having Protrusions for Detection

A developer cartridge comprising:

• a first gear configured to rotate about a first axis extending in an axial direction, the first gear including gear teeth;
• and
• a second gear configured to rotate in a rotation direction about a second axis extending in the axial direction, the second gear having a peripheral surface extending in the rotation direction, the second gear comprising:
• an engagement portion formed on a part of the peripheral surface and extending in the rotation direction, the engagement portion being configured to engage the gear teeth;
• a first protrusion protruding in the axial direction and extending in the rotation direction, the first protrusion having a first end and a second end opposite to each other in the rotation direction;
• and
• a second protrusion protruding in the axial direction and extending in the rotation direction, the first protrusion and the second protrusion being configured to move together with the engagement portion, the first protrusion and the second protrusion being arranged to be spaced apart from each other in the rotation direction, the second end being arranged closer to the second protrusion than the first end is to the second protrusion, the second protrusion having a third end and a fourth end opposite to each other in the rotation direction, the fourth end being arranged farther away from the first protrusion than the third end is from the first protrusion, the first end and the second end defining a first angle therebetween about the second axis, the second end and the third end defining a second angle therebetween about the second axis, the first angle being smaller than the second angle.