Browse Prior Art Database

Comparing Circuit

IP.com Disclosure Number: IPCOM000098038D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Lego, JH: AUTHOR

Abstract

This comparing circuit device detects the occurrence of an error and provides visual column error indication.

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Comparing Circuit

This comparing circuit device detects the occurrence of an error and provides visual column error indication.

For comparing data, 80 neon tubes 50 are provided. Contact rollers 17 and 26 are connected in parallel through brushes 41 and 42, respectively, to a +40 volt D.C. supply. The sensing brush 16 for one position is selectively connectable through plug hubs 43 and 44 and jumper wire 45 to electrode 51 of one tube 50 and to current limiting resistor 60. Resistor 60 is connected to a -60 volt D. C. supply through a reset switch RS. Similarly, sensing brush 25 for the corresponding position is selectively connectable through plug hubs 46 and 47 and jumper wire 48 to electrode 52 of tube 50 and to current limiting resistor 61. Resistor 61 also connects to the -60 volt D. C. supply through the reset switch RS. Electrode 53 of tube 50 is connected to ground potential through resistor 62 of relatively low value and to the input of amplifier 70. The amplifier 70 output is connected to the input of thyratron 71 having a relay R1 connected in its plate circuit. Relay R1 controls normally closed contacts, not shown, which, upon being opened, stop the machine.

The neon gas becomes ionized when there is a potential difference of approximately 100 volts between any of the electrodes. Hence, if any perforation is sensed at one index position but not at the corresponding index position, the potential difference under these conditions is sufficient to cause...