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Broken Punch Sensing

IP.com Disclosure Number: IPCOM000077124D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Sebastian, R: AUTHOR

Abstract

The presence of broken punches in a punch and die assembly are detected by coupling electromagnetic energy between a transmitting and sensing coil through the dies.

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Broken Punch Sensing

The presence of broken punches in a punch and die assembly are detected by coupling electromagnetic energy between a transmitting and sensing coil through the dies.

In a typical card punching assembly, card stock 10 to be punched is inserted between movable receiving die 11 and the punch mount assembly which includes a floating guide 12, a punch support base 13 and a punch 14 retained within the base and guide. Breakage of 14 can result in catastrophic damage to the punch and die assembly.

Transmitter 15 generates an energizing signal which is coupled through a guideway or channel to transmitting coil 16, which is mounted in a recess of 13. The electromagnetic energy from 16 is coupled through 14 to sensing coil 17 mounted in a recess within 12. The output of 17 is connected through a guideway to detector 18. As long as an output is present from 17, 18 is quiescent. Loss of an output from 17 causes 18 to generate a stopping signal to machine controls 19, thereby ceasing the bidirectional movement of 11 as indicated at 20.

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