Patent ID: 9098018
Filing Date: 2015-08-04
Classification: G03G

Abstract:
1. A developing device, comprising: a developing container that stores therein a developer including a magnetic carrier and a toner, a first stirring conveyance member and a second stirring conveyance member that stir and convey the developer within the developing container; and a developer carrying member that is disposed to face an image carrier on which an electrostatic latent image is formed, that is rotatably supported by the developing container, and that carries the developer supplied from the second stirring conveyance member, wherein the developing container includes wherein, in the discharge passage, there is disposed a discharge screw that is provided to be continuous with an end portion of one of the first stirring conveyance member and the second stirring conveyance member, and that has a rotation shaft and a spiral blade provided on a peripheral surface of the rotation shaft; wherein a discharge regulating member that regulates discharge of the developer is provided at a portion within the discharge passage on an upstream side of the developer discharge port in a developer discharge direction; wherein the discharge regulating member includes a blade diameter enlarging portion wound at least once around an outer peripheral portion of the spiral blade; and wherein a gap between an outer peripheral portion of the blade diameter enlarging portion and an inner peripheral surface of the discharge passage is narrower than a gap between an outer peripheral portion of a portion of the spiral blade that is not provided with the blade diameter enlarging portion and the inner peripheral surface of the discharge passage.