초록 ▼

A control system for automatically regulating a spray gun paint pressure in which an ideal pressure value is represented by a current flow in a collection line and the real pressure value is represented by a voltage signal that sets a voltage to current transducer via which the collector line curren

A control system for automatically regulating a spray gun paint pressure in which an ideal pressure value is represented by a current flow in a collection line and the real pressure value is represented by a voltage signal that sets a voltage to current transducer via which the collector line current flows. A bypass resistor is connected to the collection line across the inputs of a differential amplifier in a control circuit that controls a supply and exhaust valve for the spray gun paint pressure. As collector line current flows via the voltage to current transducer decreases consistent with the real pressure value being reduced relative to the ideal pressure value, increased current flows via the bypass resistor, thereby increasing the voltage potential across the inputs of the differential amplifier to cause the control circuit to operate the supply valve and accordingly increase the real pressure value to the level of the ideal pressure value.

대표청구항 ▼

A control system for automatically regulating the amount of paint emitted by a spray gun, said control system comprising: (a) a consumer line connected to said spray gun; (b) control valve means for varying the pressure in said consumer line and accordingly the desired amount of paint to be emitted

A control system for automatically regulating the amount of paint emitted by a spray gun, said control system comprising: (a) a consumer line connected to said spray gun; (b) control valve means for varying the pressure in said consumer line and accordingly the desired amount of paint to be emitted by said spray gun; (c) a control circuit including a differential amplifier having first and second inputs and an output providing a polarity signal when a voltage potential exists across said first and second inputs to operate said control valve means depending upon the sense of said polarity signal; (d) means for providing a control signal representative of the ideal pressure of said consumer line including a collection line connected to said first input of said differential amplifier, said collection line having an electric current corresponding to said control signal; (e) first transducer means connected to said consumer line for providing a voltage signal representative of the actual pressure of said consumer line; (f) second transducer means connected between said first transducer means and said collection line for conducting the flow of electric current therefrom in accordance with said voltage signal; (g) a reference potential line connected to said second input of said differential amplifier; and (h) a resistor connected between said collection line and said reference potential line via which current in said collection line flows when the current thereof deviates from the current of said second transducer to thereby establish said voltage potential across said first and second inputs of said differential amplifier.