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System controlling apparatus which compares signals from sensors monitoring passing objects with pre-determined parameter information to control the system

  • US 4,283,031 A
  • Filed: 12/12/1978
  • Issued: 08/11/1981
  • Est. Priority Date: 12/14/1977
  • Status: Expired due to Term
First Claim
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1. A system controlling apparatus comprising:

  • an array of sensors each for detecting information concerning passing articles and for providing signals indicative of the information, each of said sensors being magnetic field proximity sensors, passing articles disturbing a magnetic field, each of said sensors having two transducers spaced less than the length of each of said articles to be detected and wherein each of said transducers includes means for creating said magnetic field, and sensing means disposed within said magnetic field and responsive to changes in said magnetic field such that when said magnetic field is disturbed by the proximity of each article, the sensing means operates to provide information as to that article;

    field disturbing means for disturbing said magnetic field whereby to cause the sensing means to operate and provide a facility for simulating the disturbance of the field that would be caused by the proximity of each article; and

    signal processing means for comparing the signals with predetermined parameter information as to the system and for providing predetermined control to the system in response to detecting equality between the signals and the predetermined parameter information and for providing an overriding control to the system in response to detecting inequality between the signals and the predetermined parameter information.

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