Patent ID: 6249664
Filing Date: 2001-06-19
Classification: G03G

Abstract:
A developing device for developing an electrostatic latent image on a photoreceptor with developer containing magnetic carrier particles and toner, wherein the developing device has A-side and B-side and the B-side is closer to the photoreceptor than the A-side, comprising:a developing cylinder located at the B-side in close proximity to the photoreceptor so as to convey the developer toward the photoreceptor;a first agitating conveying rotator located at the A-side for agitating said developer; anda second agitating conveying rotator located between the developing cylinder and the first agitating conveying rotator, for receiving the developer from the first agitating conveying rotator, for agitating the developer, and for conveying the developer to the developing cylinder;the first agitating conveying rotator and the second agitating conveying rotator both rotating in the same direction to form a rotation locus, wherein the direction of a velocity vector tangent to the top of the rotation locus is directed from the B-side toward the A-side;wherein each of the first agitating conveying rotator and the second agitating conveying rotator comprises a shaft and a screw blade extended along the shaft, the screw direction of the screw blade of the first agitating conveying rotator being opposite to that of the second agitating conveying rotator; andwherein a partition wall is provided between the first agitating conveying rotator and the second agitating conveying rotator and both ends of the partition wall are provided with ports through which the developer is conveyed between the first agitating conveying rotator and the second agitating conveying rotator.