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File Retrieval Apparatus with Pneumatic Compare

IP.com Disclosure Number: IPCOM000093851D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 62K

Publishing Venue

IBM

Related People

Davis, CJ: AUTHOR [+2]

Abstract

The apparatus uses pneumatic comparison for retrieval of matching documents from a file memory. The serial pneumatic comparator at a and the parallel pneumatic comparator at b are incorporated in a system shown at c. The system is for processing and searching information stored in latch type cards as at d and file index cards as at e. Perforated tape can also be used as the media.

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File Retrieval Apparatus with Pneumatic Compare

The apparatus uses pneumatic comparison for retrieval of matching documents from a file memory. The serial pneumatic comparator at a and the parallel pneumatic comparator at b are incorporated in a system shown at c. The system is for processing and searching information stored in latch type cards as at d and file index cards as at e. Perforated tape can also be used as the media.

The serial comparator at a includes input manifold 1, output 2 and a number of circulatory bypass paths A, B, C, and D. To perform a search, search mask 3 with openings that are complementary to perforated card 4 required is positioned as shown. In the example at a, mask 3 has openings A' and B' and closures C' and D'. Card 4 is fed into position for reading to determine matching or nonmatching. Card 4 has openings C and D that are complements of mask 3 and either openings or closures at other hole positions. Several types of logical comparisons can be implemented. However, the comparator a operation is described with a straight And search.

In this comparison, an indication of a match is desired if C and D are open, i.
e., punched. In any individual card, other hole positions such as A could be punched, but C and D must be punched for a match indication. In the match shown, air applied to manifold 1 circulates as traced by dashed line 5. A continuous open path exists from inlet 1 to outlet 2 and sensor 6 indicates low pressure. When card 4 does not match, the path traced by line 5 to outlet 2 is not completed and sensor 6 indicates high pressure. The comparison works in a similar fashion for other hole and closure combinations in mask 3 and card 4.

The principles are applicable to a parallel comparator as at b. This comparator has housing 7 with pressure sensor 8, inlet manifold 9, and outlet port 10. Support plate 1 1 has holes A''... F'' in every possible position of comparison. Search mask 12 has perforations that are complementary to the desired document 13. In the case illustrated, mask 12 has perforation...