Browse Prior Art Database

Pneumatic Paper Sensor

IP.com Disclosure Number: IPCOM000076112D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Hamilton, WR: AUTHOR

Abstract

A paper sensor is provided for sensing the presence or absence or a sheet of paper in a copying machine.

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Pneumatic Paper Sensor

A paper sensor is provided for sensing the presence or absence or a sheet of paper in a copying machine.

An airstream is forced through the Bernoulli nozzle, generally indicated at 1. The Bernoulli nozzle consists of external ring surface 2 and deflector 3. As the air jet passes through the nozzle, it creates a region of low pressure between it and actuator plate 4. Actuator plate 4 is pulled into its extended position against the force of spring 7. In so doing, it brings switch actuator 5 into proximity with switch 6, thereby conditioning switch 6 into one of its two possible conditions. As a sheet of paper passes into the low-pressure region created by Bernoulli nozzle 1, the low-pressure region acts on the bottom surface of sheet 9 tending to pull the sheet toward surface 2. This also blocks the effect of the low-pressure region from actuator plate 4 and allows spring 7 to pull the plate into the position indicated as 4'. As plate 4 occupies position 4', switch actuator 5 is moved to position 5', thus deconditioning switch 6 and allowing it to attain its second position.

The use of a positive pressure air stream eliminates problems with clogging and contamination in the nozzle, and also provides a reliable positive pressure to actuate the mechanism.

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