Image forming device with improved mixing of circulated developer with replensihed toner

An image forming device having a developer stirring and conveying member for stirring and conveying developer to a developer carrier developing an electrostatic latent image on an image carrier;

• a toner conveying member provided through a toner conveying path for conveying toner to a developer stirring and conveying path of the developer stirring and conveying member that communicates with the toner conveying path;
• and a toner replenishing member for replenishing toner to the toner conveying member, wherein:
• developer located at a lowermost-stream side of said developer stirring and conveying member is conveyed downstream of a toner replenishing portion of said toner conveying path to circulate the developer.

An image forming device having a developer stirring and conveying member which is provided with a developer receiving portion for receiving circulated developer and a toner replenishing portion for receiving replenished toner, the toner replenishing portion being located outside of the developer receiving portion in an axial direction of said developer stirring and conveying member, wherein:

• said developer stirring and conveying member receives developer from an upside thereof through said developer receiving portion and toner from a downside thereof through said toner replenishing portion, and a toner concentration detecting unit is put in a position where the developer and the toner are mixed by said developer stirring and conveying member.

An image forming device having a developer stirring and conveying member which is provided with a developer receiving portion for receiving circulated developer and a toner replenishing portion for receiving replenished toner, the toner replenishing portion being located outside of the developer receiving portion in an axial direction of said developer stirring and conveying member, wherein:

• said developer stirring and conveying member receives developer from an upside through said developer receiving portion and toner from a downside through said toner replenishing portion, and a toner concentration detecting unit is positioned off a lower side of said developer stirring and conveying member as viewed from an axial direction of said developer stirring and conveying member.

An image forming device having a developer carrier, a plurality of developer stirring and conveying members arranged horizontally along the developer carrier, a partition provided between the developer stirring and conveying members, connecting passages provided at both ends of the partition so that developer can turn back therethrough, and a toner replenishing means for replenishing toner from an end portion of one of the developer stirring and conveying members, in which an electrostatic latent image formed on an image carrier is made visible with a two-component developer including toner and carrier to form a developed image, wherein:

• a scattering prevention member is provided above one of said developer stirring and conveying members located farthest away from said developer carrier and along an axial direction of the developer stirring and conveying member so that toner particles scattered when replenishing the toner cannot directly arrive at said developer carrier or the developer around said developer carrier.