Browse Prior Art Database

Self Actuating Shutoff Valve for a Document Transport

IP.com Disclosure Number: IPCOM000092876D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Bradley, RE: AUTHOR

Abstract

This pneumatic apparatus for a document transport system reduces the capacity of the needed blower or vacuum pump in the event of an absent or mutilated document. In a transport drum having a large number of vacuum ports, the capacity of the vacuum pump for the system is substantially large if there is not some way of impeding the flow of air where the ports are left uncovered by a mutilated document or the absence of a document. This device overcomes the problem.

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Self Actuating Shutoff Valve for a Document Transport

This pneumatic apparatus for a document transport system reduces the capacity of the needed blower or vacuum pump in the event of an absent or mutilated document. In a transport drum having a large number of vacuum ports, the capacity of the vacuum pump for the system is substantially large if there is not some way of impeding the flow of air where the ports are left uncovered by a mutilated document or the absence of a document. This device overcomes the problem.

A plastic ball 10 is contained within each air duct. As the drum rotates, centrifugal force causes the ball 10 to move to position 1. When a vacuum is applied to the drum, air flows through the ports. If there is no document over the port, the volume of air flow is large enough to create a pres sure differential across the ball 10.

If the parameters are correctly chosen, the pressure differential can be made greater than the centrifugal force. Thus the ball 10 moves to position 2, shutting off the air flowing through the port. The vacuum holds the ball 10 in position 2. If there is a document over the port, the air flow through the port is too low to create a pressure differential large enough to overcome the centrifugal force. Thus the ball 10 then remains in position 1.

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