Developing device and image forming apparatus

摘要

A developing device includes a developer carrying body, a layer thickness limiting portion, and a rotation control portion. The layer thickness limiting portion includes a base body and a flexible member. The base body protrudes toward a part at a third position between a first position and a second position on the outer circumferential surface of the developer carrying body. The flexible member is a sheet-like member having flexibility, and is attached to the base body such that the flexible member covers, via a gap, a range of the base body from a front end surface facing the developer carrying body to an upper surface, and a bent portion covering a boundary portion between the front end surface and the upper surface of the base body is closer to the outer circumferential surface of the developer carrying body than the other part is.

主权项

1. A developing device comprising:
a developer carrying body configured to, in a developer container, rotate in a first rotation direction while carrying a two-component developer on an outer circumferential surface of the developer carrying body, thereby conveying the two-component developer from a lower first position to an upper second position and feeding, at the second position, toner contained in the two-component developer to a toner carrying body at a next stage; a layer thickness limiting portion provided, via a gap, being opposed to a part at a third position between the first position and the second position on the outer circumferential surface of the developer carrying body, the layer thickness limiting portion being configured to limit a layer thickness of the two-component developer carried by the developer carrying body rotating in the first rotation direction; and a rotation control portion configured to rotate the developer carrying body in the first rotation direction when a development process is performed, and rotate the developer carrying body in a second rotation direction opposite to the first rotation direction when the development process is not performed, wherein the layer thickness limiting portion includes:
a base body protruding toward a part at the third position on the outer circumferential surface of the developer carrying body; anda flexible member which is a sheet-like member having flexibility, the flexible member being attached to the base body such that the flexible member covers, via a gap, a range of the base body from a front end surface facing the developer carrying body to an upper surface, and a bent portion covering a boundary portion between the front end surface and the upper surface of the base body is closer to the outer circumferential surface of the developer carrying body than another part is, and a gap between a first part opposed to the upper surface of the base body via a space and the upper surface of the base body is greater than a gap between a second part opposed to the front end surface of the base body via a space and the front end surface of the base body.