| 摘要 |
<p>Apparatus adapted to react to the presence or absence of articles at a location in a feed path, for example tablets in a tablet-packaging machine, comprises a senser for sensing selectively the presence and absence of an article at the location, a responder adapted to respond to signals originated by the senser, and coupling means connecting the senser to the responder. The coupling means has repeatable first and second periods of operation separated in time, and is adapted to assume a state in which it can pass signals from the senser to the responder, said first and second periods being separated by mute periods during which the coupling means is incapable of passing a signal from the senser to the responder.</p> |
