Cartridge Including Agitator Therein

摘要

A cartridge includes a casing, a developing roller, and an agitator. The casing is configured to accommodate developing agent. The casing has a first wall and a second wall disposed away from the first wall in a first direction. The agitator includes a rotational shaft and an agitating blade. The rotational shaft extends in the first direction and has a first end portion. The first end portion defines a circumferential surface and is supported to the first wall. The rotational shaft is configured to rotate in a rotating direction about a rotational center. The first wall has a concave portion having a plurality of protruding portions extending toward the circumferential surface and arranged at intervals from each other in the rotating direction. The agitating blade is positioned between the first end portion and the second end portion in the first direction and extending in the radial direction.

主权项

1. A cartridge comprising:
a casing configured to accommodate developing agent, the casing having a first wall and a second wall disposed away from the first wall in a first direction; a developing roller; and an agitator comprising:
a rotational shaft extending in the first direction and having a first end portion and a second end portion, the first end portion defining a circumferential surface and being supported by the first wall, the second end portion being supported the second wall, the rotational shaft being configured to rotate in a rotating direction about a rotational center and defining a radial direction perpendicular to the first direction, the first wall having a concave portion recessed away from the second wall in the first direction so as to receive the first end portion, the concave portion having a plurality of protruding portions extending in the first direction and extending toward the circumferential surface, the plurality of protruding portions being arranged at intervals from each other in the rotating direction; andan agitating blade positioned between the first end portion and the second end portion in the first direction and extending in the radial direction.