| 摘要 |
<p>PROBLEM TO BE SOLVED: To break loose aggregates present in a developing device on upstream of a position where developer is delivered to developer storage units on a developing roller side, without giving excessive stress to the developer.SOLUTION: A developing device includes a first developer storage unit 53Y that supplies a developer G and a second developer storage unit 54Y that supplies the developer G to a developing roller 51Y side, and two openings 58 and 59 for the developer G to circulate between the first and second developer storage units 53Y and 54Y. The second developer storage unit 54Y includes a second conveying screw 56Y conveying the developer G, which includes a forward winding part 56Ya having pitches formed in a forward direction to a developer conveyance direction, a reverse winding part 56Yb having pitches formed in a reverse direction, and a gap q provided between both the winding parts to send out the developer G. The opening 59 on the delivery side delivers the developer G from the second developer storage unit 54Y to the first developer storage unit 53Y, and is arranged at a position opposite to the gap q.</p> |
