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DEVELOPING DEVICE

  • US 20120269555A1
  • Filed: 04/17/2012
  • Published: 10/25/2012
  • Est. Priority Date: 04/20/2011
  • Status: Active Grant
First Claim
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1. A developing device comprising:

  • a developer carrying member for carrying a developer comprising a toner and a carrier;

    a circulation path along which the developer to be supplied to said developer carrying member is circulated while being stirred;

    carrier supplying means for supplying at least the carrier to said circulation path;

    a discharge opening, provided in said circulation path, through which a part of the circulated developer is to be overflowed and discharged; and

    a feeding member comprising a rotation shaft rotatably provided in said circulation path so as to oppose said discharge opening and a blade portion including a portion helically formed around the rotation shaft,wherein an outer diameter of the blade portion formed in a first region including at least a portion opposing said discharge opening is smaller than that in a second region adjacent to the first region with respect to a direction of the rotation shaft, andwherein a smaller average angle formed between the rotation shaft and a developer feeding surface of the blade portion in the first region is smaller than that in the second region.

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