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Detecting Undesired Breaks in Metal Ladders

IP.com Disclosure Number: IPCOM000094317D
Original Publication Date: 1966-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Soychak, FJ: AUTHOR

Abstract

This mechanism detects undesired circuit breaks in a conductive ladder network. Conductive ladder pattern 10 is printed on a flexible insulating sheet 12 and serves as a current steering network for a transformer core memory. The cores for such a memory, not shown, extend through holes 14 in sheet 12. To determine that the ladder has no breaks, a pair of U-shaped cores 16 and 18 is provided. Each core is connected via coils to an oscillator, e. g., 20 and 22 respectively and forms a portion of the oscillator's tank circuit. To test the condition of the ladder, it is passed between the pole pieces of cores 16 and 18 while they are simultaneously energized by their respective oscillators.

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Detecting Undesired Breaks in Metal Ladders

This mechanism detects undesired circuit breaks in a conductive ladder network. Conductive ladder pattern 10 is printed on a flexible insulating sheet 12 and serves as a current steering network for a transformer core memory. The cores for such a memory, not shown, extend through holes 14 in sheet 12. To determine that the ladder has no breaks, a pair of U-shaped cores 16 and 18 is provided. Each core is connected via coils to an oscillator, e. g., 20 and 22 respectively and forms a portion of the oscillator's tank circuit. To test the condition of the ladder, it is passed between the pole pieces of cores 16 and 18 while they are simultaneously energized by their respective oscillators.

Core 18 and its associated oscillator 22, senses the continuity of the ladder crosspieces. Core 16 senses the continuity of the vertical members of the ladder. Core 16 may not be able to detect an undesirable open circuit in a horizontal crosspiece due to the fact that another crosspiece may shortcircuit this portion of the ladder. Core member 18 corrects for this ambiguity. A continuous metal path around core 16 and 18 loads down the core and tank coil of the oscillator and causes its level to drop. This drop is detected by a level detector and a malfunction is indicated.

If breaks occur in the ladder as shown in the lower drawings, the oscillator circuit is not loaded down and the level detector can be used to indicate this condition....