Browse Prior Art Database

STAY OPEN RELIEF VALVE FOR VACUUM CORRUGATED FEEDER

IP.com Disclosure Number: IPCOM000025123D
Original Publication Date: 1983-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 61K

Publishing Venue

Xerox Disclosure Journal

Abstract

The air system in vacuum corrugated feeders must perform two functions at different times. First, it must pull down a sheet by creating a vacuum beneath it. Later, the feeder must lift a sheet stack by creating a large pressure between sheets. The stay open relief valve in the figure eliminates the need to maintain both the vacuum and the pressure at all times by allowing a vacuum to be achieved first and pressure second.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

STAY OPEN RELIEF VALVE FOR VACUUM CORRUGATED FEEDER David Eisler

Proposed Classification
U.S. C1. 137/803 Int. Cl. F15c 1/00

20

RUBBER DM PHRAM

25 \

30

The air system in vacuum corrugated feeders must perform two functions at different times. First, it must pull down a sheet by creating a vacuum beneath it. Later, the feeder must lift a sheet stack by creating a large pressure between sheets. The stay open relief valve in the figure eliminates the need to maintain both the vacuum and the pressure at all times by allowing a vacuum to be achieved first and pressure second.

In operation, valve 15 uses the rolling action of ball 30 to both operate the valve and to change the center of gravity of the valve. Starting at zero vacuum, the valve is closed. Increasing the vacuum inside the duct 20 to which the valve is attached pulls up the valve which eventually causes the ball to roll towards a hinge 25 which rotates under the pressure of the vacuum and thereby opens the valve. When the vacuum decreases (pressure increases), the valve (now with a new center of gravity) drops and the ball rolls into the closed position. The changing center of gravity tends to keep the valve open after it has been opened.

Volume 8 Number 5 September/October 1983 385

I

[This page contains 1 picture or other non-text object]

Page 2 of 2

September/October 5 Number 8 Volume DISCLOSURE XEROX 386 JOURNAL 1983

[This page contains 1 picture or other non-text object]