| 摘要 |
<p>The machinery uses a prime mover which is coupled through a clutch to drive a rotatable member, and in which rotation of the rotatable member has to be established prior to initiating control action. A first device is provided for producing a first steady state electrical signal substantially free of transients to indicate rotation of the prime mover. A second device is used for producing a second steady state electrical signal free of transients to indicate that the clutch, interposed between the prime mover and the rotatable member, is engaged to drive the rotatable member in rotation. A third device combines the first and second steady state signals so that rotation of the rotatable member is established when both the first and second steady state signals are present.</p> |
