| 摘要 |
A feeder for a sheet-processing machine includes at least one lifting sucker carried by a suction head for lifting a paper sheet from a sheet pile, a device for taking over the lifted paper sheet and for conveying the paper sheet from the lifted position thereof above the sheet pile to a sheet-processing unit, a device for applying a continuously acting force potential upon the lifting sucker downwardly in a direction towards the sheet pile, a suction device for cyclically controllably raising the lifting sucker in a direction opposing the force potential, the suction device being disposed rotationally symmetrically with respect to an axis of the lifting sucker, and being controllable for maintaining the lifting sucker in the raised position thereof on the suction head.
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