| 摘要 |
A pressing mechanism that presses a solid lubricant against a brush roller includes two movable members that receive the biasing force of a single biasing unit, rotate around a fulcrum, and press places of the solid lubricant at the symmetric positions with respect to the center of a contact portion of the solid lubricant. The curvature of a portion of a curve shape of the movable member that contacts a casing inner wall is set such that the pressing force in a pressing direction of the solid lubricant in the last stage becomes greater than the pressing force in an intermediate stage, from the initial stage to the last stage after the solid lubricant of the predetermined amount or more is scraped off via the intermediate stage. |
