| 摘要 |
In the context of a sheet feeder comprising a suction head, which is provided with separating suckers arranged on a vertically movable support, and at least one row of drag suckers mounted on a support, which is adapted to be reciprocated partly at the same rate as conveyor means for further transport and is preferably able to be pivot for righting oblique sheets, such drag suckers being adapted to be supplied with vacuum on the transfer of a sheet from the separating suckers and to be vented on the release of the sheet to such means for further conveyance thereof, it is possible to ensure a more rapid decrease in the vacuum level on sheet transfer if the drag sucker support, which is able to be reciprocated and is provided with at least one venting opening and a closing member associated with it, such closing member is able to be lifted from its seat within the constant rate range of the drag suckers and the further conveyor means, by means of a control member secured to the suction head.
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