STACK WEIGHT SENSING PAPER TRAY
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
A document stacking tray 1 for a document feeder is spring 2 supported such that a stack 3 of documents of more than a pre-set weight will depress the tray 1 sufficiently to cause an electrical switch 4 to activate. The switch 4 is under the tray and activated by the tray position rather than directly by the stack and therefore is not affected by air floatation of the stack. Switch 4 provides a signal to a control 5 which controls respective valves 6, 7 for a vacuum sheet feeder 8 and air knife separator assist 9 supplied from the respective intake and outlet of a blower 10 of the type disclosed for example, in U.S. Patent No. 4,299,381, to appropriately control both air pressure levels for the indicated greater stack weight.