| 摘要 |
A shaft construction for use in winding or rewinding a web such as a strip of paper, a band of woven cloth, a sheet of metal, and the like around its paper-made core comprises a center hollow shaft having a longitudinal air passage through it, and a plurality of individual hollow expandable annular members mounted around the center hollow shaft and arranged adjacent to each other along the effective length of the center hollow shaft. The annular members are separated by an intervening spacer ring from the adjacent annular members, and each is internally communicative with the center hollow shaft for accepting a compressed air from the center hollow shaft. Each of the annular members engages and press against the paper-made core with a suitable pressure force for maintaining the coaxial relationships between each annular member and the paper-made core.
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