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Pneumatic Sensing Device

IP.com Disclosure Number: IPCOM000096151D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Schumacher, O: AUTHOR

Abstract

Punched card 1 passes continuously through the slot formed by perforated plates 2 and 3. Pressure chamber 4 is rotatably mounted on shaft 5, which, at the same time, serves as a feed conduit for compressed air. Shaft 5 together with spring 6 guided in 7, forms an oscillating system. The inherent frequency of this system is so selected that slot 8, provided in the bottom of pressure chamber 4, passes over the holes 9 of perforated plate 2 once at each index time.

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Pneumatic Sensing Device

Punched card 1 passes continuously through the slot formed by perforated plates 2 and 3. Pressure chamber 4 is rotatably mounted on shaft 5, which, at the same time, serves as a feed conduit for compressed air. Shaft 5 together with spring 6 guided in 7, forms an oscillating system. The inherent frequency of this system is so selected that slot 8, provided in the bottom of pressure chamber 4, passes over the holes 9 of perforated plate 2 once at each index time.

If at that instant a punched hole of card 1 is positioned underneath a hole of plate 2, a compressed air impulse passes. This is through pipe 10 to permanent magnet 11 which is attached to spring 12 and deflects downwardly in a direction toward reed contact 13. Under the influence of the magnetic field, reed contact 13 is closed.

It remains in this condition even after magnet 11 returns to its original position. This is because the magnetic field, which is still effective, is sufficient to keep the reed contact closed.

In this manner, a storage effect is obtained and contact bouncing is eliminated. Before the start of the next index time, reed contacts 13 are respectively opened by special release windings 14. For the operation of scanning punched cards line by line, the reed contacts are arranged in several planes one below the other. The movement of pressure chamber 4 is synchronized with the card movement by devices not shown.

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