Patent ID: 8750764
Filing Date: 2014-06-10
Classification: G03G

Abstract:
1. A trickle-type developing device that receives supply of two-component developer including toner, supplies the toner to a photoreceptor, and develops an electrostatic latent image formed on the photoreceptor, the developing device comprising: a stirring and conveying tank provided with stirring and conveying screws that stir, convey and circulate the developer; a hollow cylindrical discharge member via which a part of the developer is conveyed from the stirring and conveying tank to a discharge opening through which the part of the developer is discharged from the discharge member, the discharge opening being provided in the discharge member; and a reverse flow generating screw provided inside a portion of the discharge member, sharing one of rotation shafts of the stirring and conveying screws, and pushing back a part of the developer in a direction from the discharge opening toward the stirring and conveying tank, wherein the portion has a reduced-radius part and in a cross section thereof perpendicular to an axial direction of the one of rotation shafts of the stirring and conveying screws, an inner radius of the portion is smaller in the reduced-radius part than in the remaining part of the portion, the reduced-radius part being located in a lower part of the portion with respect to a vertical direction of the portion.