Developing apparatus

A developing apparatus for developing an electrostatic image, the developing apparatus comprising:

• rotatable toner carrying means for supplying a toner for developing an electrostatic image;
• rotatable developer forward means for forwarding and supplying a toner to the toner carrying means;
• a developer forward passage disposed around said developer forward means;
• electric field generating means for generating an electric field for delivering the toner to the toner carrying means;
• and
• toner supply means containing therein developer comprising the toner and a carrier comprising nonmagnetic particles, the toner supply means including a stirring area where the developer is stirred;
• a forward force imparting area where a forward force is imparted to the developer to allow the developer to be supplied to the forward passage;
• and a toner supply area where the developer is caused to confront the toner carrying means;
• the toner supply means comprising a cylindrical member having a circumference with openings thereon.

A developing apparatus for developing an electrostatic image the developing apparatus comprising:

• rotatable toner carrying means for supplying a toner for developing an electrostatic image;
• rotatable developer forward means for forwarding and supplying a toner to the toner carrying means;
• a developer forward passage disposed around said developer forward means;
• electric field generating means for generating an electric field for delivering the toner to the toner carrying means;
• and
• toner supply means containing therein developer comprising the toner and a nonmagnetic resin carrier, the toner supply means including a stirring area where the developer is stirred;
• a forward force imparting area where a forward force is imparted to the developer to allow the developer to be supplied to the forward passage;
• and a toner supply area where the developer is caused to confront the toner carrying means;
• the volume resistivity of the carrier being from 10.sup.6 to 10.sup.12 .OMEGA..multidot.cm.

An image forming apparatus for developing an electrostatic latent image, comprising:

• electrostatic latent image holding means for holding said electrostatic latent image;
• toner carrying means for carrying a nonmagnetic toner, being disposed to confront the electrostatic latent image holding means;
• developer forward means for stirring a developer including the nonmagnetic toner and a nonmagnetic resin carrier, and forwarding the developer, being disposed to confront said toner carrying means with a gap interposed therebetween;
• an inner wall surface of a frame of the apparatus having a surface profile corresponding to a surface profile of said developer forward means, to which a part of said developer forward means is disposed closely;
• and
• voltage applying means for applying a voltage to generate an electric field for attracting the toner in the developer toward the toner carrying means in an area where the toner carrying means confronts the developer forward means.