发明名称 |
Capacitively coupled machine tool safety having a self-test network |
摘要 |
A machine tool safety system includes an electric field generator capacitively coupled to a receptor antenna. A self-test network includes a self-test radiating antenna and a circuit arrangement operative to apply a test signal to the self-test antenna. The test signal may be of sufficient strength to induce in the receptor antenna a first excitation signal having a magnitude greater than a first predetermined threshold to verify that the safety system is operative to detect the entry of the field generator carried on an operator's person into a hazard zone proximal to the machine tool. The test signal may be of sufficient strength to induce a second excitation signal greater than a second threshold to verify that the safety system is operative to detect the entry of the field generator into an arming zone spaced from the hazard zone.
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申请公布号 |
US4518958(A) |
申请公布日期 |
1985.05.21 |
申请号 |
US19820345191 |
申请日期 |
1982.02.02 |
申请人 |
E. I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
COOK, WILLIAM A.;HOFFMAN, GARY R.;PULFORD, WILLIAM M. |
分类号 |
B23Q11/00;F16P3/14;G05B19/4063;G08B21/02;G08B29/14;H04B5/00;(IPC1-7):G08B21/00 |
主分类号 |
B23Q11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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