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Pneumatic Chadless Tape Reader

IP.com Disclosure Number: IPCOM000095110D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Kambic, S: AUTHOR [+2]

Abstract

The device pneumatically senses a particular code pattern on chadless tape 10. The device includes channel 12 through which tape 10 passes. Channel 12 has grooves 14 formed in its upper and lower surfaces corresponding to each of the index positions on tape 10. Nozzles 16 protrude into selected ones of channels 14 in accordance with the code to be detected. Air at a pressure indicated by gauge 18 is supplied to nozzles 16 through tube 20 and manifold 22. Air passing through manifold 22 is applied through tube 24 to gauge 26.

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Pneumatic Chadless Tape Reader

The device pneumatically senses a particular code pattern on chadless tape
10. The device includes channel 12 through which tape 10 passes. Channel 12 has grooves 14 formed in its upper and lower surfaces corresponding to each of the index positions on tape 10. Nozzles 16 protrude into selected ones of channels 14 in accordance with the code to be detected. Air at a pressure indicated by gauge 18 is supplied to nozzles 16 through tube 20 and manifold 22. Air passing through manifold 22 is applied through tube 24 to gauge 26.

In operation, when the code which it is desired to be sensed is under nozzles 16, each nozzle in channel 14 on the lower surface of chamber 12 is adjacent to a down chad such as chad 28. Each nozzle 16 in the upper surface of chamber 12 is adjacent to an up chad such as chad 30. When this situation arises, as it is when the code shown on the right portion of tape 10 is adjacent to nozzles 16, each nozzle is blocked by an adjacent chad. Air can therefore not escape through nozzles 16. The pressure applied to tube 24 and detected by gauge 26 is substantially the same as the pressure detected by gauge 18. If a code other than that which it is desired to detect is adjacent to nozzles 14, at least one of the nozzles at the bottom of chamber 12 is adjacent to an up chad or one of the nozzles in the upper surface of chamber 12 is adjacent to a down chad.

Assume for example that the code shown on the left of tape 10 is...