초록 ▼

A method of and a system for electrically processing vacuum pressure information, which is suitable for use in a vacuum unit. Pressure values are detected and a desired pressure value lower than the highest vacuum pressure value of the detected pressure values is displayed on a displaying device in

A method of and a system for electrically processing vacuum pressure information, which is suitable for use in a vacuum unit. Pressure values are detected and a desired pressure value lower than the highest vacuum pressure value of the detected pressure values is displayed on a displaying device in digital form. The desired pressure value is stored in a storing device. Each of pressure values relative to vacuum, which are detected by a pressure detecting element held in front of a passage communicating with a vacuum port, is converted into a digital signal. The so-converted digital signal is digitally displayed on the displaying device. The desired pressure value stored in the storing device is compared with each of the detected pressure values relative to the vacuum, and information about faulty points is displayed on the displaying device based on the result of comparison.

대표청구항 ▼

A method of electrically processing vacuum pressure information, which is suitable for use in a vacuum unit in which a workpiece is attracted or released under suction, said method being executed by a vacuum control apparatus and comprising the steps of: providing a plurality of pressure sensors dis

A method of electrically processing vacuum pressure information, which is suitable for use in a vacuum unit in which a workpiece is attracted or released under suction, said method being executed by a vacuum control apparatus and comprising the steps of: providing a plurality of pressure sensors disposed at different positions in the vacuum unit; detecting pressure values at said different positions in the vacuum unit upon attraction and release of the workpiece; displaying a desired pressure value on a displaying means in digital form, said desired pressure value being lower than a highest vacuum pressure value of a plurality of sequential pressure values detected by at least one of said pressure sensors; storing said desired pressure value in a storing means; converting each of said sequential pressure values into digital signals, said sequential pressure values being detected by a pressure detecting element held in front of a passage which communicates with a vacuum port, and thereafter digitally displaying the converted digital signals on said displaying means; comparing said desired pressure value stored in said storing means with each of said sequential pressure values; determining improper operation of said vacuum unit based on a result of the comparison of said desired pressure value stored in said storing means with each of said sequential pressure values; and after the improper operation of said vacuum unit has been determined at said determining improper operation step, said method comprises the step of: determining a failure point in said vacuum unit which includes the steps of: (a) detecting a further pressure value at a position upstream from a component in said vacuum unit through one of said plurality of pressure sensors located at said position upstream from said component in the vacuum unit; (b) detecting a further pressure value at a position downstream from said component through a further one of said plurality of pressure sensors located at said position downstream from said component; (c) determining a differential pressure between the detected further pressure values upstream and downstream from said component; and (d) comparing said differential pressure with a predetermined threshold value; and displaying information about said failure point on said displaying means based on a result of said comparison of said differential pressure with said predetermined threshold value.