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Electromechanical Display

IP.com Disclosure Number: IPCOM000092210D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Folmar, AJ: AUTHOR

Abstract

This electromechanical device displays a decimal digit from a parallel binary input. The mechanism employs decimally coded display wheel 19 on ten-tooth splined shaft 18, driven by four racks 11a...11d having one, two, four and eight teeth respectively. Ratchet 21 and pawl 22 hold the displayed digit until reset by input 24. Racks 11a...11d are spring-loaded in grooves 12 of carrier 10. Each rack has a detent, not shown, for latching its teeth above surface 14 when all racks are momentarily pushed upward by reciprocating arm 13. The detents are individually retractable by solenoids 15a...15d in response to a binary signal stored at input 16. Racks whose detents are retracted return into grooves 12 when arm 13 falls.

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Electromechanical Display

This electromechanical device displays a decimal digit from a parallel binary input. The mechanism employs decimally coded display wheel 19 on ten-tooth splined shaft 18, driven by four racks 11a...11d having one, two, four and eight teeth respectively. Ratchet 21 and pawl 22 hold the displayed digit until reset by input 24. Racks 11a...11d are spring-loaded in grooves 12 of carrier 10. Each rack has a detent, not shown, for latching its teeth above surface 14 when all racks are momentarily pushed upward by reciprocating arm 13. The detents are individually retractable by solenoids 15a...15d in response to a binary signal stored at input 16. Racks whose detents are retracted return into grooves 12 when arm 13 falls. Carrier 10 now moves longitudinally so that the upwardly latched racks sequentially engage shaft 18, rotating wheel 19 to display the proper decimal digit in window 20. Wheel 19 is spring-loaded to prevent overshoot. Ratchet 21 and pawl 22 prevent wheel 19 from backing up. Reset input 24 operates solenoid 23 to disengage pawl 22, allowing wheel 19 to return to zero when desired. Input 24 can be connected to sense a zero binary input 16. The detents of all racks 11a...11d then retract and carrier 10 returns to its original position.

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