Patent ID: 8126370

Claim:
A developing unit, comprising: a developing unit housing having a developing part including a developing roller and a feed roller, and a developing agent storing part to store a developing agent, the developing unit housing having a flat configuration with a channel formed therein between the developing agent storing part and the developing part, the channel defined by a top wall and a bottom wall; and an agitating member rotatably provided in the channel between the developing agent storing part and the developing part to transfer the developing agent stored in the developing agent storing part to the developing part, the agitating member including a shaft and a first film and a second film attached to the shaft, wherein when the agitating member is in a first rotational position, the agitating member closes the channel by the first film contacting an inner surface of the top wall defining the channel and the second film contacting an inner surface of the bottom wall defining the channel to prevent the developing agent stored in the developing agent storing part from moving to the developing part.