| 摘要 |
In a web offset rotary printing machine having a printing tower with upper and lower portions defining a recess between them, and an interchangeable cassette lodged in the recess and supporting at least plate and blanket cylinders, the upper and lower portions are joined by an elevator mechanism so that the upper portion may be raised and lowered relative to the tower portion to accommodate the interchange of cassettes of different heights. A cassette is supported on transverse linear bearings on the lower portion, and helps support the upper portion when the latter is lowered onto it. The linear bearings allow a cassette to be slid in and out from either side of the machine. The cassettes may be of different heights, thus facilitating optimization of the cylinder arrangement in the cassette. A mechanism is described permitting accurate alignment of form rollers with their associated plate cylinder such that skew adjustments may be made to the plate cylinder when plates or cassettes are changed without upsetting individual form roller adjustments.
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