Voltage to air pressure transducer

Claim 1

A means for controlling the pressure of liquid adhesive in response to movement of the article to which the adhesive is to be applied, including a pressure regulating valve, the input of which is connected to a source of liquid adhesive, the output of which is connected to a means for applying adhesive, said pressure regulating valve including a passage between said input and output and a valve member controlling adhesive flow through said passage, means for providing a variable air pressure upon said valve member, which air pressure varies in response to changes in movement of the article to which adhesive is to be applied, said means for providing a variable air pressure including an air pressure reservoir, a pressure-to-voltage transducer connected at the output of said reservoir, and electrically controlled air pressure supply valve and an electrically controlled exhaust valve connected to said reservoir, means for providing an electrical signal representative of movement of the article to which adhesive is to be applied, comparison means for poviding a signal representing the difference between said electrical signal and the output from said transducer, and means connecting and utilizing said difference signal to control said supply valve and exhaust valve.