| 摘要 |
<p>Disclosed herein is an automatically controlled weigh feeding system including a container prefilled with a substance, a device for discharging the substance from the container at a controllable rate, apparatus for weighing the container and its contents and for producing an electrical signal proportional to that weight, thereby indicating the volume of the substance remaining within the container, a differentiator circuit for converting the electrical signal into a rate signal, a comparator circuit for comparing the rate signal with a reference signal, and a device actuated by the output of the comparator circuit for controlling the discharge of the substance from the container. Also, a sensing circuit is provided for maintaining the fill level of the container between predetermined maximum and minimum levels, and for locking the discharge control device against deviation during the filling of the container.</p> |
