| 摘要 |
PROBLEM TO BE SOLVED: To provide an image formation device that can secure a usage for a long period of time.SOLUTION: A digital mult-function machine 11 comprises a gear support mechanism 51 that includes a gear 52, a boss part 53, and a base part 54. An outer diameter face 61 of the boss part 53 includes: a first outer diameter face 62a that extends in a direction perpendicular to one face 58 located on a side having the boss part 53 provided of the base part 54; and a second outer diameter face 62b that obliquely extends so that an outer diameter of the boss part 53 is gradually larger from an end part 63a on a base part 54 side of the first outer diameter face 62a. An inner diameter face 64 of the gear 52 includes: a first inner diameter face 65a that extends upright in a thickness direction of the gear 52 in an area facing the first outer diameter face 62a, and is shaped to run along the second outer diameter face 62b; and a second inner diameter face 65b that slants in a shape running along the second outer diameter face 62b in an area facing the second outer diameter face 62b. In a boundary area between an outer diameter face 61 of the boss part 53 and one face 58, an oil resistance substance layer 69 is provided that is composed of a layer of a substance having oil resistance.SELECTED DRAWING: Figure 5 |
