| 摘要 |
<p>PURPOSE:To enhance the durability of an elastic roller for a copying machine or the like, by providing an elastic layer with a plurality of holes, which extend in the radial direction, in such a manner that the holes take a spiral form having a fixed radius and that two or more of the holes are penetrated with any radius-line at the same time. CONSTITUTION:An elastic layer 1, which is formed on a core metal member 26 as an integrated body, is arranged in such a manner that the outer surface of a base layer part 2, the inner surface of a surface layer part 4, and the side surface of a strut member 3 form a plurality of holes that spirally extend in the radial direction with a fixed radius and that are arranged at an equal interval in the circumferential direction. On the other hand, the strut part 3 is formed in such a manner that it has an angle of inclination alpha to a radius-line of the elastic roller and that at least two of the holes 5 exist constantly for any angular position of any radius-line 6 or 7. In addition, the hardness of the strut part 3 is set to the value as desired, depending upon its angle of inclination alpha, its thickness t, and the thickness of both base layer part 2 and surface layer part 4. Thus, uniform and very low hardness as desired can be obtained over the entire peripheral surface of the elastic roller, thereby enhancing the durability.</p> |
