Browse Prior Art Database

STACK WEIGHT SENSING PAPER TRAY

IP.com Disclosure Number: IPCOM000024873D
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 49K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

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KEROX DISCLOSURE JOURNAL

STACK WEIGHT SENSING PAPER TRAY Proposed Stephen J. Wenthe, Jr. Classification

U.S. CI. 271/11 Int. C1. B65h 5/08

a

I I I

CONTROL

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.

Volume 7 Number 4 July/August 1982 229

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230 XEROX DISCLOSURE JOURNAL

Volume 7 Number 4 July/August 1982

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