| 摘要 |
An expandable printing cylinder mandrel (10) is disclosed comprising a four-piece mandrel assembly having spaced outer journal sections, a first cylindrical sleeve (13) circumferentially mounted at its ends about a respective journal section (11, 12) a second cylindrical sleeve (16) having an inner diameter slightly larger than the outer diameter of said first cylindrical sleeve and being circumferentially mounted thereon by means, for example, circumferential welds (57), to provide a substantially uniform space (17) circumferentially between said first (13) and second sleeve members (16). The second sleeve member is provided with one or more yield or preferential expansion regions, for example, circumferential grooves (19), and a hydraulic system for applying pressure between said first and second sleeve members to thereby effect outward expansion of said second sleeve member. Another feature of the invention comprises the interchangeability of image carrier sleeves (61, 62) each having a selected thickness for mating operation with different inking rollers.
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