VACUUM ACQUISITION SHROUD
Original Publication Date: 1986-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
A simple modification to a top vacuum corrugation feeder (TVCF) is disclosed for improving air efficiency and feeding reliability. In TVCF's, a critical performance feature is the ability to acquire a sheet from a stack to the feedhead within a prescribed time interval. This is done by "flufing" the positioned stack followed by drawing a flow across the stack top. This flow induces a negative pressure field on the stack top which draws the top sheet to the feedhead. From basic fluid mechanics this negative pressure field's magnitude may be increased by increasing the flow impedance between the atmosphere and the feedhead. This results in an increased feeding reliability coupled with decreased air power requirements. An acquisition shroud, which is simply a thin (.001" thick) material draped about the sides of a feedhead to reduce leakage from the side is a method and means for achieving the desired results described heretofore. This approach improves acquisition of curled up sheets, is neutral for flat sheets, and decreases latitude for curled down sheets.