Replenishment system, developing device, and image forming apparatus

A replenishment system, comprising:

• a rotator disposed above a transport path along which a developer is transported and below a replenishment path for toner, the rotator rotating about an axis extending in a transport direction of the transport path while holding the developer;
• a path provided downstream of the replenishment path in a rotation direction of the rotator, along a part of an outer circumference of the rotator, the path allowing the toner from the replenishment path to move therealong in the rotation direction to the transport path;
• an accumulator provided in an area including the path and extending from the path outward in a radial direction of the rotator, the accumulator accumulating the developer shifted upward from the transport path;
• and
• a projecting portion that projects from an upper portion of the transport path into the transport path, the projecting portion having a lower surface forming a path surface of the transport path,
• wherein the accumulator accumulates the developer stopped by a stopper surface facing upstream in the transport direction and the stopper surface is disposed at an upstream end of the projecting portion.