Developing apparatus having carrying capability of screw lowered on developing sleeve side

A developing apparatus comprising:

• a developer carrying body, opposed to an image bearing body bearing an electrostatic image, for carrying a magnetic developer;
• a regulating member, provided under said developer carrying body, for regulating an amount of the developer on said developer carrying body;
• a first magnetic pole provided in said developer carrying body and near to a portion regulated by said regulating member;
• a second magnetic pole, provided at an upstream side of said first magnetic pole in a moving direction of said developer carrying body, for forming a repulsive magnetic field with said first magnetic pole;
• a first screw for agitating and carrying a developer dropped from said developer carrying body by the repulsive magnetic field;
• and
• a second screw for forming a developer circulating path with said first screw and receiving a replenished developer,
• wherein developer-carrying capability of said first screw is lower than a developer-carrying capability of that of said second screw, and
• wherein a location on a surface of the developer between said first and second magnetic poles is higher than a location on a surface of said developer carrying body at which a density of a magnetic flux produced by said first magnetic pole is 200 gauss in a direction of a normal to a surface of said developer carrying body.