| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a central part ghost or an edge part fogging in an image copying paper due to a toner feeding roll. SOLUTION: In this toner feeding roll that is brought into a pressure contact with a developing roll in a state of constant contact in an image forming process, a soft foaming agent layer 34a is shaped to be gradually swelled to be thicker toward a central part in the axial direction from both edge parts in the axial direction. A relative radius swelling quantity Y (mm) between the central part in the axial direction and both the edge parts in the axial direction in the soft foaming agent layer is restricted to be within a range of a radius expansion quantity calculating formula Y=aX when an intrusion quantity is defined as X (mm) (where 'a' is a coefficient with a value range that is selectable from 0.07 to 0.7). |
