US 9,811,026 B2
Developing device
Takanori Iida, Noda (JP); and Yusuke Ishida, Toride (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Aug. 10, 2016, as Appl. No. 15/233,049.
Claims priority of application No. 2015-170389 (JP), filed on Aug. 31, 2015.
Prior Publication US 2017/0060031 A1, Mar. 2, 2017
Int. Cl. G03G 15/08 (2006.01)
CPC G03G 15/0893 (2013.01) [G03G 15/0844 (2013.01); G03G 2215/083 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A developing device mountable to an image forming apparatus, comprising:
a developing container configured to accommodate a developer;
a rotatable member including a first screw portion configured to feed a developer in a first direction in said developing container and a second screw portion, provided coaxially with said first screw portion and downstream of said first screw portion with respect to the first direction, configured to feed the developer in a second direction opposite to the first direction;
a first feeding path configured to accommodate said first screw portion of said rotatable member and configured to feed the developer;
a second feeding path provided in communication with said first feeding path at a position downstream of said second screw portion with respect to the first direction, wherein a position of a bottom of said second feeding path is closer to a rotation shaft of said rotatable member than a position of a bottom of said first feeding path is, and a cross-sectional area of said second feeding path perpendicular to a rotational axis of said rotatable member is smaller than a cross-sectional area of said first feeding path perpendicular to the rotational axis of said rotatable member; and
a discharging opening provided in said second feeding path and configured to permit discharge of the developer,
wherein in a state in which said developing device is mounted to the image forming apparatus, in a cross section of said second feeding path perpendicular to the rotational axis of said rotatable member, said second feeding path has a shape such that said second feeding path includes a region where a distance between side surfaces of said second feeding path in a side above a center of the rotation shaft with respect to a vertical direction increases upwardly.