Developing apparatus
First Claim
1. A developing apparatus comprising:
- a first chamber, provided with an opening, for containing a developer;
a second chamber for forming a circulating path with said first chamber through the opening;
a first feeding member for feeding the developer contained in said first chamber;
a second feeding member for feeding the developer contained in said second chamber; and
a developer carrying member, provided in said first chamber, for carrying the developer to a developing position in which said developer carrying member opposes an image bearing member, thereby to develop an electrostatic image formed on the image bearing member,wherein at least one of said first feeding member and said second feeding member has a multiple thread screw portion having a number of threads n and a thread pitch P, andwherein said opening opposes the multiple thread screw portion and extends from a most downstream end position of the multiple thread screw portion with respect to the developer feeding direction of the multiple thread screw portion toward an upstream side of the multiple thread screw portion in a length of at least nP.
1 Assignment
0 Petitions
Accused Products
Abstract
A developing apparatus includes a developer container for containing a developer; a first screw, provided in a first screw, provided in a first chamber in the developer container, for feeding the developer; a second screw, provided in a second chamber in the developer container, for feeding the developer in a direction opposite from that of the first screw; an opening through which the developer is moved between the first chamber and the second chamber; and a developer carrying member, provided in the first chamber, for carrying the developer to effect development of an electrostatic image. At least one of said first screw and said second screw has a multiple thread screw portion having a number n of threads and a thread pitch P. The opening is located downstream from the multiple thread screw portion in a developer feeding direction and extends from a downstream-side end of the multiple thread screw portion in the developer feeding direction toward an upstream side of the multiple thread screw portion in a length equal to or more than nP.
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Citations
8 Claims
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1. A developing apparatus comprising:
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a first chamber, provided with an opening, for containing a developer; a second chamber for forming a circulating path with said first chamber through the opening; a first feeding member for feeding the developer contained in said first chamber; a second feeding member for feeding the developer contained in said second chamber; and a developer carrying member, provided in said first chamber, for carrying the developer to a developing position in which said developer carrying member opposes an image bearing member, thereby to develop an electrostatic image formed on the image bearing member, wherein at least one of said first feeding member and said second feeding member has a multiple thread screw portion having a number of threads n and a thread pitch P, and wherein said opening opposes the multiple thread screw portion and extends from a most downstream end position of the multiple thread screw portion with respect to the developer feeding direction of the multiple thread screw portion toward an upstream side of the multiple thread screw portion in a length of at least nP. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification