| 摘要 |
A vacuum drum is located in close proximity to the lowermost flat workpiece in a stack of workpieces in a hopper for applying a suction to remove the bottommost workpieces one at a time from the hopper for passing on to a conveyor to a printing press. The drum is mounted on a reciprocably rotatable hollow-cored shaft for reciprocable rotation therewith and has multiple sets of vacuum outlets which can be selectively positioned in vacuum communication with the hollow bore of the shaft for feeding vacuum from the shaft bore to a selected one of the multiple sets of vacuum outlets so that the drum can be used for a variety of workpieces.
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