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Punch Check Circuit

IP.com Disclosure Number: IPCOM000096403D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Spurrier, CE: AUTHOR

Abstract

The checking circuit is for use with a punch mechanism. Each punch position has a punch member 2 and an interposer 4 for selectively coupling a common punch bail 6 to move member 2 to punching position as bail 6 is driven downwardly by punch cam 8. Each interposer 4 is connected to a corresponding armature 10. The armatures are moved to the retracted position by the armature restore cam 12, and held in the restored position by common hold coil 14.

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Punch Check Circuit

The checking circuit is for use with a punch mechanism. Each punch position has a punch member 2 and an interposer 4 for selectively coupling a common punch bail 6 to move member 2 to punching position as bail 6 is driven downwardly by punch cam 8. Each interposer 4 is connected to a corresponding armature 10. The armatures are moved to the retracted position by the armature restore cam 12, and held in the restored position by common hold coil 14.

Release coil 16 wound to produce a flux in opposition to the hold coil flux is provided for each punch position. Punches 2 are selectively controlled by applying a signal to input terminal 21 to turn on the magnet driver transistor 22 and thus energize release coil 16 of the selected punch. Armature 10 is released to move interposer 4 to the operative position between punch bail 6 and punch 2.

When armature 10 is restored, the resulting flux changes cause current to flow in associated release coil 16. This current pulse forwardly biases the punch check transistor 18. This causes an output at terminal 26 which is compared (by devices not shown) with the punch data to obtain a check. Diode 20 suppresses the surge voltage due to the turning off of magnet driver transistor 22. Resistor 24 limits the base current in punch check transistor 18.

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