08-09-2022 дата публикации
Номер: US20220281231A1
Принадлежит:
A vacuum belt conveyor sequentially delivers sheet articles to a digital printer. The sheets are held in position by vacuum on the underside of the sheets through apertures in the belts and covered by the sheets. A plurality of independent plenums on the underside of the belt have chambers respectively communicating with rows of apertures extending along the belt. Vacuum is selectively applied from a manifold only to the plenum chambers that supply apertures that are covered by the sheets so that the ink from the printer will not be directed from its intended position on the sheet by vacuum from adjacent uncovered belt apertures. The sheets are fed to the conveyor in synchronism with the conveyor speed by a timed feeder so that the sheets are carried by the conveyor with a predetermined gap between the sheets and no belt apertures in the gap. A sensor counts the apertures in the belt and activates the feeder at predetermined time intervals. 1. Conveyor apparatus comprising in combination:{'b': 10', '12', '10', '22', '12', '10', '12', '10, '(i) a conveyor having a conveyor belt () movable along a generally horizontal path for moving articles () along said path, said belt () having a plurality of apertures () for introducing a vacuum to the articles () on said belt () to hold the articles () on the belt ();'}{'b': 22', '22', '10', '22, '(ii) means for opening a number of said apertures () to a source of vacuum and for closing other apertures () in the belt () to a source of vacuum while said first number of apertures () are open to said vacuum source; and'}{'b': 12', '10', '12', '10', '12', '18', '12', '10', '18', '22', '10', '12', '22', '10', '22', '12', '18, '(iii) means for successively feeding articles () on the belt (), and characterized in that the means for successively feeding the articles () on the belt () successively feeds the articles () such that there are gaps () between successive articles () on the belt () and said gaps () do not contain any apertures ...
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