Importance

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Abstract

A system for creating a control signal having a value indicative of the position of the lateral edge of a moving web wherein the system creates a succession of ultrasonic pulses from a transmitter, each of the pulses being created at a known transmit time in response to a transmit signal with the pulses each having a number of oscillations defining a pulse envelope having a pulse start portion. The system directs the ultrasonic pulses toward an ultrasonic receiver along a selected path whereby the position of the lateral edge of the web in the path determines the energy of the pulse as it is received by the receiver and converts the received pulse into an electronic signal having an amplitude determined by the energy of the received pulse. The receiver is spaced from the transmitter a predetermined distance causing the pulses to be received by the receiver at a given time after the transmit signals for a given ambient temperature. The system includes the function of creating a logic window having a given time-based length and occurring at a set time after the transmit signal with the set time being slightly less than the given time whereby each of the electronic signals occurs at an offset time in the logic window and the function for controlling the value of the control signal by the amplitude of the electrical signal.

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First Claim