| 摘要 |
PURPOSE: To prevent toner soiling on an image edge part owing to the non- electrified toner from occurring, by forming vicinity of an opening part of an agitation space in a sectional plane shape of making developer staying amount more corresponding to the agitation space of another part. CONSTITUTION: In a developing doctor 24, with regard to an area opposing to a lower side of a lower agitation screw 14, in other wards, an opening part opposite area 24a opposing to the opening part in the agitation space of the lower agitation screw part, a shape is set so as to locate a member of the development doctor 24 in a position apart from a lower agitation screw 14. A non-opposite area 24b other than the opening part opposite area 24a, is formed in the shape rising higher than the opposite area 24a. Thus, the non- opposite area 24b, is formed in the shape that the distance from the lower agitation screw 14 is relatively shortened. In this way, with regard to the shape of the developing doctor 24, the vicinity of the opening part of the agitation space of the lower agitation screw 14 is composed in a shape capable of increasing the developer stay amount, corresponding to the agitation space of another part. |
