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System for Eliminating Home Emitter Wheel

IP.com Disclosure Number: IPCOM000078932D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Carlson, JA: AUTHOR [+3]

Abstract

The system provides an emitter pulse G for each of the teeth 10 on an emitter wheel 12, and also for a position 10a on the periphery of the wheel 12 at which a tooth 10 is missing. In addition, the system provides a home pulse F corresponding to the position 10a on the wheel 12. Conventionally, two emitter wheels have been used for providing these two types of pulses; and such emitter and home pulses are useful in connection with the timing of a print wheel, for example.

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System for Eliminating Home Emitter Wheel

The system provides an emitter pulse G for each of the teeth 10 on an emitter wheel 12, and also for a position 10a on the periphery of the wheel 12 at which a tooth 10 is missing. In addition, the system provides a home pulse F corresponding to the position 10a on the wheel 12. Conventionally, two emitter wheels have been used for providing these two types of pulses; and such emitter and home pulses are useful in connection with the timing of a print wheel, for example.

The system includes an electromagnetic transducer 14 having an end positioned in close proximity to the ends of the teeth 10. Transducer 14 is connected with amplifier 16, and amplifier 16 produces the output signal A which is in substantially sinusoidal form, except for the position 10a at which one of the teeth 10 is missing. The signal A is applied to a Schmidt trigger circuit 18 which provides an output signal B of square-wave form. The leading edge 18a and the trailing edge 18b of the square waves occur at points on the sinusoidal wave A, close to but slightly spaced from zero.

Schmidt trigger circuit 18 supplies its output to a single-shot 20 which produces a signal C, having an uplevel of fixed duration less than the period of signal A. The leading edges 20a of the square waves of signal C occur at the same times as the leading edges 18a. The signal C is applied onto a ramp generator circuit 22. Circuit 22 includes a resistor 24 connected in series with a condenser 26. The junction 28 between resistor 24 and condenser 26 is connected to a compare circuit 30 having the signal E as its output. The compare circuit 30 also...