| 摘要 |
The roller (18) varies in radius along its axis and approximates to a rotary body being composed of radially expanding or contracting sectors (32,34,36,38) in the form of cones of angle ( alpha ) between 3-39, 5-29 and 7-19 deg . The roller thus has ring shoulders along its axis. The roller is waisted (44) in its center (48) giving a contour (46) similar to a human neck or backbone. The roller is carried in its stand (12,14,16) baseplate (12) and bearings notably flanges (14a,16a,14b,16b), all releasably joined together.
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