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Providing a Home Pulse and Character Pulses from a Single Emitter Wheel

IP.com Disclosure Number: IPCOM000081785D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Dwire, JD: AUTHOR [+2]

Abstract

The circuitry provides a single home pulse 22 and a plurality of equally timed, spaced character pulses 20 from a single revolution of emitter wheel 24. Most prior structures require a home emitter wheel and a second, character emitter wheel for providing substantially the same home and character pulses.

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Providing a Home Pulse and Character Pulses from a Single Emitter Wheel

The circuitry provides a single home pulse 22 and a plurality of equally timed, spaced character pulses 20 from a single revolution of emitter wheel 24. Most prior structures require a home emitter wheel and a second, character emitter wheel for providing substantially the same home and character pulses.

As emitter wheel 24 rotates, emitter out signals 10 are produced by transducer 26 having its end located in close proximity to teeth 24a on wheel 24. Emitter amplifier 28 squares the emitter signals produced by transducer 26 on line 10, these being emitter pulses 12. Wheel 24 has a missing tooth space 24b, and there are corresponding omissions of peaks in signal 10 and pulses in signal
12.

Oscillator 30 drives counter 32 through AND circuit 34, and counter 32 is reset by counter reset spikes 14 which exist at the rise of each of the emitter pulses 12 due to the action of AND circuit 34, flip-flop 36 and OR circuit 38. Flip- flop 36 is an AC set and DC reset bistable device. Flip-flop 40, which is of the same type of bistable device as flip-flop 36, disenables AND circuit 34 through inverter 42 so that the reset spikes 14 exist only at the times shown in Fig. 2.

When the space 24b comes opposite transducer 26, there is no voltage peak on line 10 or corresponding emitter pulse 12. Counter 32, therefore, continues counting to a higher value than previously, and AND circuit 44 is so connected to ...