| 摘要 |
A backup roll of the built-up type has its shrinkage-fitting surface formed between an arbor and a sleeve divided into two portions, i.e. one an inward stepped shrinkage-fitting portion and the other an outward shrinkage-fitting portions, the former being formed on said shrinkage-fitting surface at substantially its mid portion in an axial direction for a limited length by an annular protrusion of said arbor and a corresponding annular dent of said sleeve and the latter being formed on said shrinkage-fitting surface at both sides of said inward stepped shrinkage-fitting portion, whereby the shrinkage ratio of said inward stepped shrinkage-fitting portion is selected to be as small as possible in so far as it can prevent the relative rotation between said arbor and said sleeve, whereas that of said outward shrinkage-fitting portions is selected to be far less than that of said outward stepped shrinkage-fitting portion, and is an extreme case even to zero.
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