A developer replenishing device for replenishing a developing device with a
developer, and a developer container for use therewith. The developer
container, or toner bottle, includes a shoulder portion adjoining a first
end of a hollow body. The body is formed with a spiral guide for guiding a
developer stored in the developer container. The shoulder portion forms a
wall and includes an engaging portion engageable with driver that causes
the body to rotate. The engaging portion includes a lug protruding from
the shoulder portion which allows a characteristic of toner to be
identified. The engaging portion has an outside surface of a guide portion
that guides a developer stored in the developer container. Two engaging
portions may be angularly spaced from each other by 180 degrees. The
developer container also includes a discharge mouth, which adjoins the
first end of the body, which is smaller in diameter than the shoulder
portion, and which includes an annular collar protruding outwardly, and a
positioning portion positioned on a holder for the developer container.
The positioning portion includes a lug protruding from an outside surface
of the body. The holder for the developer container includes a hitting
member which hits against the outside surface when the body is caused to
rotate. A plurality of lugs are formed on an outside circumferential
surface of the collar of the discharge mouth.
