Sheet feeding or delivering – Feeding and delivering – Separator and conveyor
Patent
1981-06-02
1983-12-20
Stoner, Jr., Bruce H.
Sheet feeding or delivering
Feeding and delivering
Separator and conveyor
271 31, 271245, 271276, 271108, 355 3SH, 355 76, B65H 522, B65H 310
Patent
active
044213069
ABSTRACT:
A document feeder defines a sheet path along which a document sheet is fed across a platen of a copier/duplicator, for example, in order to copy the sheet. An oscillating vacuum tube feeds sheets from a supply into the sheet path. The feeder includes a platen vacuum transport having vacuum belts that move the sheet across the platen. The vacuum transport has a first vacuum plenum and a second vacuum plenum located along the sheet path. The first vacuum plenum has a relatively high level of vacuum to insure lifting of the sheet onto the vacuum belts. The sheet is then transported into the area where it comes under the influence of the second vacuum plenum. The second vacuum plenum has a somewhat lower level of vacuum, but it is sufficient to retain the sheet on the belts as the belts drive the sheet into engagement with a registration member. The lower level of vacuum applied at the time the sheet engages the registration member voids damage to the leading edge of the sheet. The lower level of vacuum in the second plenum also allows the belts to be continuously driven after the sheet reaches the registration member to correct any mis-alignment of the sheet.
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Research Disclosure Bulletin, Item 21139, Nov. 1981, pp. 413-415, "Document Feeder . . . " Muka.
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Childress G. Herman
Eastman Kodak Company
Stoner Jr. Bruce H.
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