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Proximity switch insensitive to interference fields
| Details |
Inventors: Kammerer, Heinz; Reinhard (Neuhausen, both of, DE);
Assignee: Gebhard Balluff Fabrik Feinmechanischer Erzeugnisse GmbH & Co. (Neuhausen, DE)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Ip; Paul
Attorney, Agent or Firm: Kramer, Brufsky & Cifelli
In order to improve a proximity switch insensitive to interference fields r detecting the position of a machine element with at least one sensor which generates in the proximity of a machine element standing in a position to be detected a total signal having a detection field signal component caused by the machine element and an interference field signal component caused by the interference field and transmits it to a circuit which converts the total signal into an output signal, such that both the gradients of the detection field generated by the machine element and the gradients of the interference field do not affect response of the proximity switch, it is suggested that the conversion of the total signal into the output signal be carried out by the time dependence of the interference field being determined, by a corresponding sequence of scanning pulses being obtained therefrom and the first signal being scanned with these, and by a value which is determined thereby resulting in an output signal indicating that the machine element is in its position to be detected if this value exceeds a preselectable minimum value with which a minimum field strength required for response of the proximity switch is preselectable. |
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DETAILED DESCRIPTION We claim: 1.
A proximity switch for detecting the position of a machine element comprising: at least one sensor providing a first signal having a total signal comprising a detection field signal component caused by a machine element in proximity with said at least one sensor and in interference field signal component caused by an interference field; circuit means, responsive to said first signal for providing an output signal as a function of the detection field signal component, said circuit means including: means for providing a sequence of scanning pulses in response to a time dependence of said interference field; means for scanning said first signal with said scanning pulses; and means for providing a threshold signal in response to the scanning pulses indicating that said machine element is in a position to be detected, wherein the value of the threshold signal is preselectable to a minimum value with which a minimum field strength required for response of said proximity switch is established.
2.
Proximity switch as defined in claim 1, characterized in that said interference field signal component of said first signal is used to determine the time dependence of said interference field.
3.
Proximity switch as defined in claim 2, characterized in that said interference field signal component is coupled out of said first signal and transmitted as a second signal to said circuit means for determining the time dependence of said interference field which generates therefrom second pulses as the scanning pulses with which said first signal is scanned.
4.
Proximity switch as defined in claim 1, characterized in that a second sensor is provided at a larger distance from said machine element standing in a position to be detected than said first sensor and generates a second signal including a second interference field signal component, and in that in order to determine the time dependence of said interference field, the sequence of first pulses or of second pulses, respectively, corresponding to the time dependence of said interference field, is obtained as the scanning pulses either from said first signal generated by said first sensor or from said second signal generated by said second sensor, and said second signal or said first signal, respectively, is scanned with these scanning pulses
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