| US 7,562,871 B2 | ||
| Pressurized air assist system for feeding overlapping sheets to an interfolder | ||
| Andrew L. Haasl, Green Bay, Wis. (US); and David J. Stubenvoll, DePere, Wis. (US) | ||
| Assigned to Fabio Perini S.p.A., Lucca (Italy) | ||
| Filed on Sep. 07, 2006, as Appl. No. 11/470,737. | ||
| Claims priority of provisional application 60/715091, filed on Sep. 08, 2005. | ||
| Prior Publication US 2007/0057449 A1, Mar. 15, 2007 | ||
| Int. Cl. B65H 29/54 (2006.01) | ||
| U.S. Cl. 271—309 [271/310; 271/194; 271/195; 271/196; 271/69] | 5 Claims |
| 1. A sheet supply system, comprising:
a sheet supply roll for supplying successive upstream and downstream sheets;
a sheet supply passage located downstream of the sheet supply roll for receiving the sheets from the sheet supply roll;
a retard roll arrangement located downstream of the sheet supply passage for receiving the sheets from the sheet supply passage
and slowing the rate of advancement of the sheets, including the downstream sheet, relative to the upstream sheet;
a pick roll located adjacent the sheet supply roll for engaging the trailing end area of the downstream sheet and moving the
trailing end area of the downstream sheet outwardly as the leading end area of the upstream sheet is advanced into an overlapping
relationship relative to the trailing end area of the downstream sheet; and
a pressurized gas supply arranged to introduce pressurized gas into an area downstream of the pick roll and upstream of the
sheet supply passage, wherein the pressurized gas supply functions to separate the trailing end area of the downstream sheet
from the leading end area of the upstream sheet.
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