Patent ID: 8874009
Filing Date: 2014-10-28
Classification: G03G

Abstract:
1. A developing device comprising: a developer carrying member for carrying developer containing a non-magnetic toner and a magnetic carrier to a position where said developer carrying member is opposed to an image bearing member; a developing container including a first chamber for accommodating the developer to be supplied to said developer carrying member, a second chamber provided below said first chamber, and an opening for communication between said first chamber and said second chamber to circulate the developer between said first chamber and said second chamber; a first feeding member and a second feeding member rotatably provided in said first chamber and said second chamber, respectively, for stirring and feeding the developer, with said first feeding member provided with a first magnet member at a position where the developer is taken up from said second chamber into said first chamber, and said second feeding member provided with a second magnet member at the position where the developer is taken up from said second chamber into said first chamber, wherein said first magnet member and said second magnet member are provided so that same magnetic polarity portions are opposed to each other or so that a ratio of a range in which the same magnetic polarity portions are opposed to each other is greater than a ratio of a range in which opposite magnetic polarity portions are opposed to each other.