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DEVELOPING DEVICE

  • US 20180017895A1
  • Filed: 07/10/2017
  • Published: 01/18/2018
  • Est. Priority Date: 07/15/2016
  • Status: Active Grant
First Claim
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1. A developing device comprising:

  • a developer bearing member configured to be rotatable, bear developer containing toner and carrier, and convey the developer to a development area opposing an image bearing member;

    a first chamber which is disposed below a rotation axis of the developer bearing member in a vertical direction and from which the developer is supplied to the developer bearing member;

    a second chamber disposed so as to be exposed to the developer bearing member and configured to accommodate the developer having passed through the development area and collected from the developer bearing member;

    a first conveyance screw portion disposed in the first chamber and configured to convey the developer in the first chamber in a first conveyance direction;

    a second conveyance screw portion disposed in the second chamber, comprising a rotatable shaft portion, and configured to convey the developer in the second chamber in a second conveyance direction opposite to the first conveyance direction;

    a partition wall configured to separate the first chamber from the second chamber;

    a first communication portion configured to permit the developer in the second chamber to be communicated from the second chamber to the first chamber; and

    a second communication portion configured to permit the developer in the first chamber to be communicated from the first chamber to the second chamber,wherein the first communication portion defines a communication path through which the developer in the second chamber is communicated from the second chamber to the first chamber, the communication path having a first area and a second area, the first area being positioned within a range corresponding to a developer coating area of the developer bearing member in the second conveyance direction, the second area being positioned downstream of the developer coating area of the developer bearing member in the second conveyance direction, andwherein a first length of the first area is longer than a second length of the second area, the first length being a maximum length from a bottom surface portion of the communication path to an upper portion of the first area of the communication path, the second length being a maximum length from the bottom surface portion of the communication path to an upper portion of the second area of the communication path.

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