DEVELOPER CONVEYING DEVICE AND DEVELOPING DEVICE INCLUDING THE SAME, AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To reduce, in a developer conveying device including a developer conveying member formed in a hollow shape, probability of cylindrical aggregation of developer in the hollow part.SOLUTION: A developing device 70 includes a first conveying screw 72 and a second conveying screw 73 in order to convey and circulate developer. The first conveying screw 72 includes a first screw 721, and first protrusions 721K. The first screw 721 includes a hollow inner space, and is provided to extend in a spiral shape along a conveyance direction of the developer. The first protrusions 721K protrude from an inner surface of the first screw 721 toward the hollow inner space.