Pressurized air assist system for feeding overlapping sheets...

Details Pressurized air assist system for feeding overlapping sheets... Pressurized air assist system for feeding overlapping sheets...

B - Operations, Transporting

65

H

B65H 5/22 (2006.01) B65H 5/06 (2006.01) B65H 5/28 (2006.01) B65H 45/00 (2006.01)

Patent

CA 2558924

A sheet supply system, for use in supplying overlapped sheets to an interfolder, includes a bed roll on which a web is cut into successive sheets. The sheets are supplied to a sheet supply passage leading to retard rolls, which overlap the sheets within the supply passage. The trailing portion of each downstream sheet bulges outwardly as the sheet is supplied to the supply passage. An air tube directs pressurized air into a volume within which the bulge in the downstream sheet is formed. The pressurized air prevents the leading portion of the upstream sheet from being drawn outwardly along with the trailing area of the downstream sheet, by counteracting a vacuum that results from outward movement of the trailing portion of the downstream sheet after it is released from the bed roll. The pressurized air also maintains the upstream sheet in engagement with stripper fingers that guide the sheets through the sheet supply passage, and ensures separation between the trailing end of the downstream sheet and the leading end of the upstream sheet.

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