DEVELOPER TRANSFERRING DEVICE, DEVELOPING DEVICE, PROCESS UNIT AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of reducing the number of toner concentration detection errors caused by variation in the volume of a toner below that of the related art.

SOLUTION: A reverse vane 29K for transferring K developer in an opposite direction to a screw vane 28K as a rotary shaft member 27K rotates protrudes from the rotary shaft member in a region of an entire rotary axis direction region of a first screw member 26K where a gravitational direction lower side faces the bottom wall 21K-6 of a first transfer chamber and two lateral sides that are orthogonal to the rotary axis direction face respective side walls (21K-3 and 21K-5) of the first transfer chamber, and a K toner concentration detection sensor (not illustrated) is disposed to detect the toner concentration of the K developer as the K developer is transferred between the reverse transfer vane 29K and a location of the screw vane adjacent to the reverse transfer vane 29K.

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