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DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

  • US 20120213554A1
  • Filed: 01/24/2012
  • Published: 08/23/2012
  • Est. Priority Date: 02/21/2011
  • Status: Active Grant
First Claim
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1. A developing device comprising:

  • a first developer conveyance path and a second developer conveyance path for conveying and circulating a two-component developer including a toner and a magnetic carrier;

    a first communicating path for guiding the two-component developer in the first developer conveyance path to the second developer conveyance path;

    a second communicating path for guiding the two-component developer in the second developer conveyance path to the first developer conveyance path;

    a first conveyance member being provided in the first developer conveyance path in a freely rotatable manner for conveying the two-component developer in one direction;

    a second conveyance member being provided in the second developer conveyance path in a freely rotatable manner for conveying the two-component developer in one direction;

    a developing roller for bearing and supplying the two-component developer in the first developer conveyance path to a photoconductor drum;

    a developer collection path for guiding the two-component developer left on a surface of the developing roller after the developer is supplied to the photoconductor drum and used for the development in a direction away from the first developer conveyance path;

    a third developer conveyance path for containing the two-component developer guided to the developer collection path and conveying the developer in one direction;

    a third conveyance member being provided in the third developer conveyance path in a freely rotatable manner;

    a toner supply port for supplying new toner to the third developer conveyance path;

    a developer drawing and conveyance path for guiding the two-component developer supplied with the new toner in the third developer conveyance path to the second developer conveyance path; and

    a developer drawing member being provided in the developer drawing and conveyance path in a freely rotatable manner for simultaneously agitating and conveying the two-component developer in one direction.

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