Browse Prior Art Database

Hammer Driver

IP.com Disclosure Number: IPCOM000097048D
Original Publication Date: 1962-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Gindi, AM: AUTHOR

Abstract

Bistable driver HD 1 is turned on by coincident inputs on lines 13 and 17, initiating a five ampere current through hammer coil 1. HD 1 is normally turned off by coincident inputs on lines 15 and 19, terminating the coil current. In the absence of a reset pulse, HD 1 acts as a monostable oscillator, turning itself off before any components overheat.

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Hammer Driver

Bistable driver HD 1 is turned on by coincident inputs on lines 13 and 17, initiating a five ampere current through hammer coil 1. HD 1 is normally turned off by coincident inputs on lines 15 and 19, terminating the coil current. In the absence of a reset pulse, HD 1 acts as a monostable oscillator, turning itself off before any components overheat.

HD 1 consists of two cross-coupled transistors T1 and T2 driving an output transistor T3. T1 and T2 are both made conductive by the coincidence of a set gate signal applied to resistor R1 and a set pulse applied to capacitor C1 through diode D1. T3 becomes conductive when T1 and T2 conduct, providing current to terminals 30 and 31. T1, T2 and T3 are made non-conductive by the coincidence of a reset gate signal applied to resistor R2 and a reset pulse applied to diode D2 through capacitor C3. If the reset pulse does not occur within a time determinable by resistor R6, capacitor C4 causes T1 and indirectly T2 and T3 to become non-conductive.

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